Inner and outer tube integrated structure, method for fixing and holding inner and outer tubes, and tubular sleeve for inner and outer integrated structure

Abstract

This invention provides an integrated inner and outer tube structure, a method for fixing and holding the inner and outer tubes X1 and X2, and a tubular sleeve 54 for the integrated inner and outer tube structure. To fix and hold the inner and outer tubes X1 and X2 with the required fixing and holding force according to their intended use, the inner and outer tubes X1 and X2 can be easily and adequately fixed and held by manually tightening the threaded portion 48. The inner and outer tubes X1 and X2, both extending vertically, are fitted together in the integrated inner and outer tube structure. A first through hole 16 and a second through hole 18 are provided on the outer peripheral surface near one end of the outer tube X2 on the fitting side. An internal thread 22 is provided on the inner peripheral surface of the second through hole 18. The integrated inner and outer tube structure has an L-shaped pressing body 38 and a tightening thread 48. The pressing body 38 has a load-bearing member 30 and a pressing member 36. The load-bearing member 30 has opposing planar portions 41, and one of the planar portions 41A has a load-bearing... The load-bearing surface 26 has a process hole extending through the thickness direction between opposing planar portions 41. A pressing member 36 extends from one end of the load-bearing member 30 to the opposite side of the load-bearing surface 26, has opposing planar portions 41, and a pressing surface 34 is provided at the top end. A fastening threaded portion 48 has an external threaded portion 40 that can engage with the internal threaded portion 22, and a head provided at one end of the external threaded portion 40. A pressing surface 46 that can abut against the load-bearing surface 26 is formed on the side of the external threaded portion 40 at the head. The pressing member 36 has at least a first through-hole. The depth of hole 16 is longer than its length, and the process hole in the load-bearing component 30 is positioned such that when the pressing component 30 is inserted into the first through hole, the external thread 40 can be screwed into the internal thread 22. By screwing in the fastening thread 48, the load-bearing surface 26 bears the pressing load through the pressing surface 46, while the pressing component 36 passes through the first through hole 16. Accordingly, when the pressing surface 34 presses against the outer peripheral surface 58 of the inner tube X1, a gap is formed between the flat portion 41A on one side of the pressing component 36 on the first through hole 16 side and the inner peripheral surface of the first through hole 16. The other end of the load-bearing component 30 is tilted toward the inner and outer tubes X1 and X2, and a wedge effect is generated at the corner of the edge portion 55 of the flat portion 41A of the pressing surface 34. In order to achieve the wedge effect, the first through hole 16 is set to span the outer peripheral surface 50 of the outer tube X2 in the length direction of the outer tube X2 through the center of the internal thread portion 22. The shape of the pressing surface 34 is set such that when the first through hole 16 is inserted, the amount of expansion in the circumferential direction of the outer tube X2 and the amount of expansion in the length direction of the outer tube X2 are both within a specified range.

Description

Technical Field

[0001] This invention relates to an integral inner and outer tube structure and a method for fixing and holding the inner and outer tubes, as well as a tubular sleeve for the integral inner and outer tube structure. More specifically, it relates to an integral inner and outer tube structure and a method for fixing and holding the inner and outer tubes by manually tightening the threaded portion in order to fix and hold the inner and outer tubes with the required fixing and holding force according to the application, thereby easily and sufficiently fixing and holding the inner and outer tubes, as well as a tubular sleeve for the integral inner and outer tube structure. Background Technology

[0002] In existing technologies, stents that can adjust height using interlocking inner and outer tubes are used in various fields such as music stents, medical stents, and holders. These supports are generally of two types: one type has a fastening threaded part screwed into a threaded hole on the outer circumference of the outer tube along a direction intersecting the length of the tube at the fitting part of the inner and outer tubes, and the outer circumference of the inner tube is pressed and fixed by the top of the thread; the other type has an external threaded part on the end circumference of the outer tube and a tubular sleeve, which has an internal threaded part on its inner circumference that engages with the external threaded part, and the fitting part is fastened by screwing in the tubular sleeve. However, both types have the problem of insufficient fixation of the inner and outer tubes. As in Patent Document 1, the inventors of this application have proposed a length adjustment fixture for a support to improve this technical problem.

[0003] The length adjustment fixture of the present invention is a length adjustment fixture between an inner tube and an outer tube that fit together. It is configured such that a pair of through slits spaced apart are provided on the outer circumferential surface of the outer tube, and an internal thread portion is provided between the pair of through slits. The fixture has a pressing portion and a fastening thread portion. The pressing portion is positioned on the outer circumferential surface of the outer tube and passes through the pair of through slits to abut against the outer circumferential surface of the inner tube. The fastening thread portion can press and fix the pressing portion toward the outer circumferential surface of the inner tube. The fastening thread portion has an external thread portion that can be screwed onto the internal thread portion. After adjusting the fitting position of the inner tube relative to the outer tube, the external thread portion is screwed onto the internal thread portion by the fastening thread portion, and at the same time, the pressing portion passes through the pair of through slits and is pressed and fixed to the outer circumferential surface of the inner tube. Alternatively, a tubular sleeve can be used, which has an internal thread portion and a through hole within a specified range on its outer circumferential surface, and is installed and fixed on the outer circumferential surface of one end of the outer tube, thereby using the tubular sleeve to fix and maintain the fitting portion of the inner and outer tubes.

[0004] According to the length adjustment fixture with the above structure, by having an internal thread portion, at least one through hole within a specified range from the internal thread portion, and at least one pressing portion that penetrates the through hole from the outer circumferential surface of the outer tube and abuts against the outer circumferential surface of the inner tube, respectively provided on the outer surface of the outer tube, and a fastening thread portion that can press and fix the pressing portion toward the outer circumferential surface of the inner tube, when adjusting the length of the mating part of the inner and outer tubes, the top surface of the pressing portion is shaped along the outer circumferential surface of the inner tube in such a way that it can make face contact with the outer circumferential surface of the inner tube. Accordingly, after adjusting the mating position of the inner tube relative to the outer tube, by rotating the fastening thread portion, the external thread portion is screwed into the internal thread portion provided on the outer circumferential surface of the outer tube. At the same time, by screwing in the fastening thread portion, the pressing portion within a specified range from the internal thread portion penetrates the through hole, and the top surface can be pressed and fixed to the outer circumferential surface of the inner tube in a face contact manner. Thus, with a simple structure, without excessive fastening force, and through simple operation, the overall length of the inner and outer tubes can be adjusted in a fixed manner.

[0005] However, the pressing part is positioned on the outer circumferential surface of the outer tube and is arranged to abut against the outer circumferential surface of the inner tube through a pair of through slits. More specifically, the external threaded part of the fastening threaded part has a process hole that extends along the thickness direction and two pressing legs that extend from the process hole in opposite directions, forming a pressing body with a longitudinal section roughly in the shape of the Japanese katakana character コ. This leads to the following technical problems. That is, firstly, according to this コ-shaped pressing body, when it is tightened by hand through the fastening thread, the fixation between the inner and outer tubes is not sufficient. When used as a support, music stands, microphones, speakers, etc., supported by a support having inner and outer tubes extending in the vertical direction, may sometimes slip off over time. More specifically, although the pair of pressing surfaces have two through holes on the outer circumferential surface of the outer tube corresponding to the pair of pressing surfaces, since they simultaneously press horizontally against the outer circumferential surface of the inner tube, the pair of pressing surfaces do not produce a wedge effect based on the pressing surfaces. Furthermore, due to the tightening force of the U-shaped plate towards the outer circumferential surface of the inner tube, the pressing force of the pressing surfaces does not increase based on the lever principle. Although increasing the head diameter of the fastening thread and refining the pitch of the external thread can increase the tightening force of the fastening thread to some extent, using a non-standard fastening thread will increase costs, and the increased tightening force may cause the fastener itself to loosen over time.

[0006] Secondly, based on the existing technology where the inner and outer tubes are fitted together by screwing, it is advantageous to use an external thread portion provided on the outer circumferential surface of the outer tube. When providing a tubular sleeve that fits into the external thread portion, resin is preferred from the perspective of low cost and lightweight. However, from the perspective of ensuring the strength of the tubular sleeve, the area and number of through holes provided along the thickness direction on the outer circumferential surface of the tubular sleeve should be as small as possible. On the other hand, when both the inner and outer tubes are made of resin, if the wedge effect of the pressing surface is too strong, scratches or dents may occur on the outer circumferential surfaces of the inner and outer tubes.

[0007] Third, the upper and lower fixing forces in the fitting part between the inner and outer tubes depend on the contact method between the inner and outer tubes. The roundness and / or surface smoothness of the inner and outer tubes have a great influence on the upper and lower fixing forces in the fitting part between the inner and outer tubes. In particular, compared with the molding process of resin inner and outer tubes, the roundness and / or surface smoothness of the inner and outer tubes are subject to machining deviations in the machining of metal inner and outer tubes. Therefore, the fixation of the inner and outer tubes in the tube length direction by screwing in the fastening thread is easily insufficient.

[0008] In this regard, Patent Document 2 discloses a nested tube fastening device, which is a fixture for fastening and inserting an inner tube B and an outer tube A in a nested relationship. It is configured to have a pressing rod 61, a U-shaped pressing member 4, and a tubular sleeve 1. By rotating the pressing rod 61, a pair of legs of the U-shaped pressing member 4 pass through a pair of through holes on the outer circumferential surface of the outer tube A and are pressed against the outer circumferential surface of the inner tube B. More specifically, a curved bearing plate 2 is provided inside the tubular sleeve 1. Correspondingly, an opening with a shape adapted to the curved bearing plate 2 is provided on the outer circumferential surface of the outer tube A on the side opposite to the pair of through holes in the diametrical direction. The curved bearing plate 2 is inserted into the opening, and on the outer circumferential surface of the outer tube A on the side opposite to the pair of through holes in the diametrical direction, it is pressed against the outer circumferential surface of the inner tube B through the curved bearing plate 2. In addition, Patent Document 3 discloses a height adjustment device for a retractable sub-tube, which is a fixture for nesting and fastening the inner tube 2 and the outer tube 1. It is configured to have a fastening threaded part 11, a U-shaped pressing member 9 and a tubular sleeve 4. By passing the external threaded part of the fastening threaded part 11 through the process hole of the U-shaped pressing member 9 and screwing it into the internal threaded part provided in the tubular sleeve 4, a pair of legs of the U-shaped pressing member 9 pass through a pair of through holes 8 provided in the outer peripheral surface of the outer tube 1 and are pressed against the outer peripheral surface of the inner tube 2.

[0009] Furthermore, Patent Document 4 discloses a fastening device for the inner and outer tubes of a telescopic tube, and describes: (Refer to...) Figures 1-3The device comprises an outer tube A, an inner tube B, a ring 1 with an external thread 3, a U-shaped component 4 with a process hole, a nut 5 that can be screwed onto the external thread 3, and an arc-shaped component 2 that can be disposed within the opening of the outer tube A. When the nut 5 is tightened, the U-shaped component 4 is pressed towards the outer tube A, and its leg ends 4, 4 press against the outer surface of the outer tube A. Tension is generated between the U-shaped component 4 and the thread 3, causing the thread 3, the ring 1, and the arc-shaped component 2 to be pulled together towards the U-shaped component 4. As a result, the arc-shaped component 2... The surface abuts against the outer surface of the inner tube B. The inner tube B is pressed and clamped by the arc-shaped component 2 and the inner wall surface of the outer tube facing the component 2, thereby being fastened integrally with the outer tube A. The device uses the U-shaped component 4 to fasten the inner and outer tubes of the telescopic tube. However, the part of pressing and fixing the U-shaped component 4 with the outer peripheral surface of the inner tube in contact with the outer peripheral surface of the inner tube, and at the same time pressing and fixing the outer peripheral surface of the inner tube on the opposite side of the pressing part relative to the surface contact part of the inner tube to the inner peripheral surface of the outer tube, is neither disclosed nor given any indication. In addition, Patent Document 5 discloses a retractable rod structure in which the inner tube 2 and the outer tube 3 are fitted together by a sleeve 41 in an adjustable length manner. An annular shoulder is formed on the inner circumferential surface of the sleeve 41, and the annular shoulder is placed on the annular end face EN of the outer tube 3. Two positioning bolts 4112 and fixing bolts 4122 are screwed into the through hole of the sleeve 41. Accordingly, the positioning bolts 4112 fix the inner tube 2, and the fixing bolts 4122 fix the outer tube 3. However, in Patent Document 5, the elastic locking plate 42 is embedded in the groove provided on the inner circumferential surface of the sleeve 41, and the positioning bolt 4112 fixes the inner tube 2 through the elastic locking plate 42 instead of directly fixing the inner tube 2, and the positioning bolt and the fixing bolt are provided separately. Furthermore, while Patent Document 5 discloses that an annular shoulder is provided on the inner side of the sleeve 41, which is equivalent to a tubular sleeve, it only discloses that the annular end face EN of the outer tube abuts against the annular shoulder of the sleeve 41 in order to position the sleeve 41 on the outer tube 3. On the other hand, it discloses that the sleeve is fixed to the inner tube 2 by other bolts 4122 and then the positioning bolts 4112 are tightened. However, it does not disclose or provide any guidance on how to rotate the sleeve axially to the desired circumferential position, that is, to place the annular shoulder of the sleeve 41 on the annular end face EN of the outer tube and rotate the tubular sleeve to the desired circumferential position with the axial direction as the center. Furthermore, the fixation of the inner and outer tubes in the extending direction of the mating portion relies on the frictional force based on the coefficient of friction between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube. Especially in the case of metal inner and outer tubes, even if the inner and outer tubes are of the same material, the frictional force can vary due to machining errors such as roundness and surface smoothness. Therefore, depending on the inner and outer tubes, the fixation in the extending direction can sometimes become unstable. In this sense, it is desirable to maintain a stable fixation in the extending direction of the inner and outer tubes, unaffected by machining errors. Patent Document 1: Japanese Invention Patent No. 7369944 Patent Document 2: Japanese Utility Model Patent No. 54-69633 Patent Document 3: Japanese Utility Model Patent No. 58-89605 Patent Document 4: Japanese Utility Model Patent No. 51-71610 Patent Document 5: U.S. Patent Application Publication 2012-0001416 Summary of the Invention The technical problem that the invention aims to solve

[0010] In view of the above technical problems, the purpose of the present invention is to provide an integral structure of inner and outer tubes and a method for fixing and holding the inner and outer tubes, as well as a tubular sleeve for the integral structure of inner and outer tubes, which can easily and adequately fix and hold the inner and outer tubes by tightening the threaded part by human force in order to fix and hold the inner and outer tubes with the required fixing and holding force according to the application. Technical solutions for solving technical problems

[0011] To achieve the objective of this invention, the integrated inner and outer tube structure of this invention is an integrated inner and outer tube structure in which inner and outer tubes, both extending in the vertical direction, are fitted together. Its configuration is as follows: A first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitting part of the outer tube, and an internal thread is provided on the inner peripheral surface of the second through hole. The integrated inner and outer tube structure has an L-shaped side cross-section pressing body and a fastening threaded part, wherein, The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. The fastening threaded portion has an external threaded portion that can be screwed into the internal threaded portion, and a head provided at one end of the external threaded portion, wherein a press-in surface is formed on the external threaded portion side of the head that can abut against the load-bearing surface. The pressing member has a length at least longer than the depth of the first through hole, and the process hole in the load-bearing member is positioned such that the external thread portion can be screwed into the internal thread portion when the pressing member is inserted into the first through hole. By screwing in the fastening thread, the load-bearing surface receives the pressing load via the pressing surface, while the pressing component passes through the first through hole. Thus, when the pressing surface presses against the outer circumferential surface of the inner tube... By forming a gap between the pressing surface of the pressing member and the inner circumferential surface of the first through hole, the other end of the load-bearing member is inclined toward the outer circumferential surface of the inner and outer tubes, and a wedge effect is generated at the corner of the edge portion of the pressing surface that includes the side inclined toward the outer circumferential surface of the inner and outer tubes. To achieve the aforementioned wedge effect, the first through hole is positioned across the outer circumferential surface of the outer tube along the length of the outer tube, passing through the center of the internal thread portion. The shape of the pressing surface is set such that, when the first through hole is inserted, the circumferential extension and the length extension of the outer tube are both within a specified range.

[0012] To achieve the objective of this invention, the integrated inner and outer tube structure of this invention is an integrated inner and outer tube structure in which inner and outer tubes, both extending in the vertical direction, are fitted together. Its configuration is as follows: A first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitting part of the outer tube, and an internal thread is provided on the inner peripheral surface of the second through hole. The integrated inner and outer tube structure has an L-shaped side cross-section pressing body and a fastening threaded part, wherein, The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. The fastening threaded portion has an external threaded portion that can be screwed into the internal threaded portion, and a head provided at one end of the external threaded portion, wherein a press-in surface is formed on the external threaded portion side of the head that can abut against the load-bearing surface. The pressing member has a length at least longer than the depth of the first through hole, and the process hole is provided in the load-bearing member at a position where the external thread portion can be screwed into the internal thread portion when the pressing member is inserted into the first through hole. By screwing in the fastening thread, the load-bearing surface receives the pressing load via the pressing surface, while the pressing component penetrates the first through hole. Thus, when the pressing surface presses against the outer circumferential surface of the inner tube... By forming a gap between the planar portion of one of the load-bearing components on the pressing component and the inner peripheral surface of the first through hole, the other end of the load-bearing component is tilted toward the outer peripheral surface of the inner and outer tubes, and the planar portion of the other end abuts against the inner peripheral edge of the first through hole. Accordingly, the pressing force of the end edge of the planar portion of the pressing surface relative to the outer peripheral surface of the inner tube is increased based on the lever principle, so as to achieve the above-mentioned increase in pressing force. The width between the two ends of the pressing surface and / or the position of the process hole in the load-bearing component are set.

[0013] To achieve the objective of this invention, the integrated inner and outer tube structure of this invention is an integrated inner and outer tube structure in which inner and outer tubes, both extending in the vertical direction, are fitted together. Its configuration is as follows: A first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitting part of the outer tube, and an internal thread is provided on the inner peripheral surface of the second through hole. The integrated inner and outer tube structure has an L-shaped side cross-section pressing body and a fastening threaded part, wherein, The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. The fastening threaded portion has an external threaded portion that can be screwed into the internal threaded portion, and a head provided at one end of the external threaded portion, wherein a press-in surface is formed on the external threaded portion side of the head that can abut against the load-bearing surface. The pressing member has a length at least longer than the depth of the first through hole, and the process hole is provided in the load-bearing member at a position where the external thread portion can be screwed into the internal thread portion when the pressing member is inserted into the first through hole. By screwing in the fastening thread, the load-bearing surface receives the pressing load via the pressing surface. Simultaneously, the pressing member penetrates the first through hole. When the pressing surface presses against the outer circumferential surface of the inner tube, a gap is formed between the flat portion of the load-bearing member on one side of the pressing member and the inner circumferential surface of the first through hole. This causes the other end of the load-bearing member to tilt towards the outer circumferential surface of the inner and outer tubes, and the flat portion of the other side abuts against the inner circumferential edge of the first through hole. Thus, the pressing surface, including the portion tilted towards the outer circumferential surface of the inner and outer tubes... The corner of the side edge generates a wedge effect, and at the same time, the pressing force of the end edge of the flat part of the pressing surface against the outer peripheral surface of the inner tube is increased based on the lever principle. In order to achieve the above-mentioned wedge effect and increase the pressing force, the wedge effect is exerted by the size of the inclination angle of the L-shaped pressing body corresponding to the gap between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube under a given weight of the supported object. At the same time, the width between the two ends of the pressing surface and / or the position of the process hole in the load-bearing component are set to ensure that the inner and outer tubes are fixedly maintained as specified.

[0014] According to the integrated inner and outer tube structure described above, when the inner and outer tubes are fitted together to form an integrated structure, the degree of fixation of the fitted portion becomes a problem in applications such as music stand supports, microphone supports, and medical supports such as infusion stands and monitor supports. However, a first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitted portion of the outer tube, and an internal thread is provided on the inner peripheral surface of the second through hole. Using an L-shaped pressing body and a fastening thread, the load-bearing component of the pressing body is inserted into the first through hole from the pressing surface at the top. At the same time, by screwing in the fastening thread, the load-bearing surface bears the pressing load. When the pressing surface presses against the outer peripheral surface of the inner tube, a gap is formed between the flat portion of the pressing component on the first through hole side and the first through hole, causing the other end of the load-bearing component to face the inner and outer tubes. The outer peripheral surface is inclined, thereby generating a wedge effect in the gap side of the pressing surface. The pressing force of the fastening thread is increased based on the lever principle with the part of the pressing surface opposite to the gap side as the fulcrum, the load-bearing surface as the force point, and the part of the pressing surface gap side as the point of action. Thus, the first through hole is set to span the outer peripheral surface of the outer tube in the length direction of the outer tube through the center of the inner thread, and the thickness of the load-bearing component and / or the size of the first through hole are set. Furthermore, the shape of the pressing surface is set such that the circumferential extension of the outer tube and the length extension of the outer tube are within a specified range when the first through hole is inserted. Accordingly, in order to fix and retain the inner and outer tubes with the required fixing and retaining force according to the application, the inner and outer tubes can be easily and adequately fixed and retained by tightening the fastening thread 48 by human power.

[0015] Alternatively, a tubular sleeve can be provided at the end of the outer tube on the side where it fits into the inner tube. The tubular sleeve can be externally fitted onto the outer circumferential surface of the outer tube, and the inner tube can penetrate the hollow part inside the tubular sleeve. The first through hole and the second through hole are provided from the outer circumferential surface of the tubular sleeve along the thickness direction. Furthermore, the pressing body can be made to penetrate the first through hole, and the pressing surface can be made to contact the outer peripheral surface of the outer tube or the tubular sleeve, while the outer peripheral surface of the inner tube opposite to the surface contact portion of the pressing surface relative to the inner tube is pressed and fixed to the inner peripheral surface of the outer tube or the tubular sleeve. Alternatively, the pressing surface may have a hardness that does not deform when the outer circumferential surface of the inner tube is pressed, and the pressing surface is formed along the outer circumferential surface of the inner tube. Alternatively, the inner and outer tubes can be arranged with the inner tube on top and the outer tube on the bottom, extending in the vertical direction, with the interlocking part of the inner and outer tubes having a circular cross-section.

[0016] Alternatively, the inner tube and the outer tube can be cylindrical, and the outer circumferential surface of the inner tube is pressed and fixed to the inner circumferential surface of the outer tube by pressing and fixing the outer circumferential surface of the inner tube to the inner circumferential surface of the outer tube by means of vertical line contact, and the outer tube is fixed and held to the inner tube by supports at two points. Alternatively, the load-bearing surface can be formed as an annular protruding circumferential surface around the process hole. Alternatively, the load-bearing surface can be formed as a protruding surface on the end side of the load-bearing component. Alternatively, the load-bearing component and the pressing component can be arranged orthogonally. Alternatively, the process hole can be located on the other end of the load-bearing component, and the tubular sleeve can be provided with a through hole on its inner circumferential surface with an internal thread. The external thread can be screwed into the through hole through the process hole, and the length of the external thread is set in such a way that the top end of the external thread does not abut against the outer circumferential surface of the inner tube when screwed in. Alternatively, the overall planar shape of the pressing surface can be an inverted U-shape that can penetrate the first through hole and open towards the second through hole, and it can be disposed around the second through hole. Alternatively, the overall planar shape of the pressing surface can be an inverted V-shape that can penetrate the first through hole and open towards the second through hole, and it can be disposed around the second through hole. Alternatively, the overall planar shape of the pressing surface can be an L-shape that can penetrate the first through hole, and it can be disposed around the second through hole.

[0017] Alternatively, the overall planar shape of the pressing surface can be a transverse shape that can penetrate the first through hole and run through the length of the tube passing through the center of the second through hole. Alternatively, the pressing component may have a uniform cross-section along its length, with its top surface forming the pressing surface. Alternatively, the inverted U-shaped and the inverted V-shaped pressing surfaces can be arranged in an axisymmetric shape relative to the length direction of the inner and outer tubes passing through the center of the internal thread. Alternatively, the inverted U-shaped pressing surface can be arranged in a concentric circle relative to the second through hole.

[0018] Alternatively, the first through hole and the second through hole can be parallel to each other and inclined at a predetermined angle relative to the extension direction of the inner and outer tubes or the tubular sleeve. Alternatively, the first through hole can be inclined at a predetermined angle relative to the extension direction of the inner and outer tubes or the tubular sleeve, while the orientation of the second through hole can be set to be orthogonal to the outer circumferential surface of the outer tube or the tubular sleeve. Alternatively, the fastening threaded portion may have a shank part and an external threaded portion extending downward from the lower surface of the shank part. An annular surface is formed around the external threaded portion on the lower surface. By screwing the external threaded portion into the internal threaded portion through the process hole, the lower surface of the shank part abuts against the load-bearing surface of the pressing body, thereby making the fastening threaded portion and the pressing body integral, pressing and fixing the inner tube, and simultaneously screwing it into and fixing it to the outer tube. Alternatively, the fastening threaded portion may have a head at the end of the shank opposite to the end of the external threaded portion that can be rotated by pinching with fingers.

[0019] Alternatively, by tightening the threaded portion, the rotation of the tubular sleeve around the length direction of the inner and outer tubes can be prevented, while the inner and outer tubes are fixed in a predetermined fitting position. Alternatively, the length of the tubular sleeve and / or the length of the load-bearing component can be set by directly pressing the top end of the external thread of the fastening thread onto the outer circumferential surface of the outer tube. Alternatively, the maximum tilt angle of the other end of the load-bearing component of the pressing body in the direction approaching the outer circumferential surface of the outer tube or the tubular sleeve when the fastening thread is tightened can be set by the thickness of the tubular sleeve and / or the gap between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube and / or the gap between the pressing surface and the first through hole. Alternatively, an external thread may be provided on the side circumferential surface of one end of the outer tube, and an internal thread that can engage with the external thread may be provided on the inner circumferential surface of the tubular sleeve.

[0020] Alternatively, the load-bearing component and the pressing component can be configured to form an obtuse angle, and the process hole can be located near the other end of the load-bearing component. Alternatively, an annular shoulder may be formed on the inner circumferential surface of the tubular sleeve, the width of which is such that it can be placed on the annular end face EN of the outer tube, so that the tubular sleeve can rotate about its length. Alternatively, the integrated inner and outer tube structure can be a musical support, which supports any one of a music stand, musical instrument, loudspeaker, and amplifier through the end of the inner tube or the outer tube opposite to the fitting part of the inner and outer tubes. Alternatively, the integrated inner and outer tube structure can be a medical stent, with casters provided at the end of the inner tube or the outer tube opposite to the fitting portion of the inner and outer tubes, allowing it to move, and supporting any one of an infusion device, a monitor, or a lighting device through the end of the outer tube or the inner tube opposite to the fitting portion of the inner and outer tubes. Alternatively, the diameter of the head and the diameter and / or pitch of the external thread can be set by manually tightening the fastening thread to fully secure the inner and outer tubes. Alternatively, the fastening force of the fastening threaded portion can be increased based on the lever principle by setting the ratio of the gap between the other flat portion of the pressing member and the center of the process hole to the distance between the other flat portion of the pressing member and the center of the second through hole.

[0021] To solve the above-mentioned technical problems, the integrated inner and outer tube structure of the present invention is an integrated inner and outer tube structure in which the inner and outer tubes, both extending in the vertical direction, are fitted together. A first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitting part of the outer tube, and an internal thread is provided on the inner peripheral surface of the second through hole. The integrated inner and outer tube structure has an L-shaped side cross-section pressing body. The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. The pressing member has a length at least longer than the depth of the first through hole, and the process hole in the load-bearing member is positioned such that the external thread portion can be screwed into the internal thread portion when the pressing member is inserted into the first through hole. Furthermore, it includes a pressing rod with an annular circumferential surface. One side of the annular circumferential surface abuts against the load-bearing surface, while the other side rotates about an axis parallel to the load-bearing surface. The annular circumferential surface is curved, with its radius expanding from a first radius to a second radius starting from the axis. Rotation of the pressing rod allows the pressing body to move within the first through hole along the thickness direction of the first through hole. The pressing rod is rotated around an axis set at a predetermined height from the outer circumferential surface of the outer tube. At a rotational position corresponding to the midpoint between the first and second radii, the pressing body begins pressing against the outer circumferential surface of the inner tube. At a rotational position corresponding to the second radius, the pressing body ends pressing against the outer circumferential surface of the inner tube, bringing the pressing surface into surface contact with the outer circumferential surface of the inner tube. The outer circumferential surface of the inner tube, opposite to the surface contact portion of the pressing surface relative to the inner tube, is pressed and fixed to the inner circumferential surface of the outer tube. By rotating the pressing rod, the load-bearing surface bears the pressing load via the pressing surface, while the pressing member penetrates the first through hole. Accordingly, when the pressing surface is pressed against the outer circumferential surface of the inner tube, a gap is formed between the planar portion of the pressing member on the first through hole side and the inner circumferential surface of the first through hole. The other end of the load-bearing member is inclined close to the outer circumferential surface of the inner and outer tubes, and a wedge effect is generated relative to the outer circumferential surface of the inner tube at the corner of the edge portion of the pressing surface containing the planar portion of the pressing surface. In order to achieve the above-mentioned wedge effect, the first through hole is set to span the outer circumferential surface of the outer tube in the length direction of the outer tube through the center of the internal thread portion. The shape of the pressing surface is set such that when inserted into the first through hole, the circumferential extension amount and the length extension amount of the outer tube are both within a specified range.

[0022] To solve the above-mentioned technical problems, the inner and outer tube fixing and holding method of the present invention has the following stages: The stage of preparing an L-shaped side cross-section pressing body, a tubular sleeve, and a fastening threaded part, wherein the pressing body has a load-bearing component and a pressing component, the load-bearing component has a load-bearing surface and a process hole, the pressing component extends from one end of the load-bearing component to the side opposite to the load-bearing surface, and has a pressing surface at the top end, the tubular sleeve has a first through hole and a second through hole on its outer peripheral surface, and an internal threaded part is provided on the inner peripheral surface of the second through hole, the fastening threaded part has an external threaded part that can be screwed into the internal threaded part, and forms a press-in surface that can abut against the load-bearing surface; The stage in which a tubular sleeve with a circular cross-section on the inner circumference is embedded in the upper end of the outer tube; The stage of embedding the inner tube into the tubular sleeve or outer tube; The stage of rotating the tubular sleeve to the desired rotation position with the length of the outer tube as the center; By tightening the threaded portion, the pressing surface is pressed from the outside of the tubular sleeve toward the outer circumferential surface of the inner tube in the thickness direction of the tubular sleeve. This fixes the tubular sleeve in the desired rotational position with the outer tube's length direction as the center. Simultaneously, the opposite outer circumferential surface of the inner tube is pressed against the inner circumferential surface of the tubular sleeve or the outer tube, thereby fixing the inner and outer tubes together in the length direction. The fixed holding stage has the following phases: by forming a gap between the planar portion of one side of the second through hole on the pressing member and the inner circumferential surface of the second through hole, the other end of the load-bearing member is inclined in a manner close to the outer circumferential surface of the inner and outer tubes, and a wedge effect relative to the outer circumferential surface of the inner tube is generated at the corner of the pressing surface containing the edge portion near the load-bearing member, and the pressing force of the fastening thread is increased based on the lever principle.

[0023] Additionally, the process may include the following steps: by pressing the tubular sleeve from the outside towards the outer circumferential surface of the outer tube in the thickness direction of the tubular sleeve, the tubular sleeve is fixed at the desired rotational position with the length direction of the outer tube as the center, and the outer circumferential surface of the opposite side of the outer tube is pressed against the inner circumferential surface of the tubular sleeve, thereby fixing and holding the inner and outer tubes together in the length direction. Alternatively, the inner circumferential surface of the tubular sleeve may be provided with a reduced diameter portion larger than the diameter of the inner tube and an expanded diameter portion larger than the diameter of the outer tube. An annular shoulder is formed at the connection between the reduced diameter portion and the expanded diameter portion. The annular shoulder is placed on the annular upper end face of the outer tube, so that the tubular sleeve rotates around the length direction of the outer tube at the desired rotational position.

[0024] To solve the above-mentioned technical problems, the integrated inner and outer tube structure of the present invention is an integrated inner and outer tube structure in which the inner and outer tubes are fitted together. It is configured such that a through hole is provided on the outer peripheral surface near one end of the outer tube on the fitting side, along the thickness direction of the outer tube, and an internal thread is formed on the inner peripheral surface of the through hole. The integrated inner and outer tube structure has a pressing body and a fastening threaded part, wherein... The pressing body has a shape that can be inserted into the through hole, and a load-bearing surface is formed on one end face, and a pressing surface is formed on the other end face relative to the outer peripheral surface of the inner tube. The fastening threaded portion has an external threaded portion that can engage with the internal threaded portion and a head provided at one end of the external threaded portion, and a press-in surface is formed on the external threaded portion side of the head that can abut against the load-bearing surface. The pressing body has a length shorter than the depth of the through hole. By screwing in the fastening thread, the top surface of the external thread rotates about the length direction of the external thread. The load-bearing surface bears the pressing load through the pressing surface. At the same time, the pressing body does not rotate with it. Through the through hole, the pressing surface is pressed tightly against the outer circumferential surface of the inner tube.

[0025] According to the integrated inner and outer tube structure described above, when the inner and outer tubes are fitted together to form an integrated structure, the degree of fixation of the fitted part becomes a problem, depending on the application such as a music stand, microphone stand, or medical stand such as an infusion stand or monitor stand. However, a through hole is provided on the outer circumferential surface near one end of the fitted part of the outer tube. The inner circumferential surface of the through hole has an internal thread. By screwing the pressing body and the fastening thread into the fastening thread, the top surface of the external thread rotates about the length direction of the external thread. The load-bearing surface bears the pressing load without rotating. At the same time, the pressing body, through the through hole, allows the pressing... The inner tube is pressed against the outer circumferential surface of the inner tube in a close-fitting manner. Accordingly, in order to fix and retain the inner and outer tubes with the required fixing and retaining force according to the application, the inner and outer tubes can be easily and adequately fixed and retained by tightening the threaded part by human power. The pressing body has a shape that can be inserted into a through hole. A load-bearing surface is formed on one end face, and a pressing surface relative to the outer circumferential surface of the inner tube is formed on the other end face. It has a length shorter than the depth of the through hole. The fastening threaded part has an external threaded part and a head. The external threaded part can be screwed into the internal threaded part. The head is provided at one end of the external threaded part, and a pressing surface that can abut against the load-bearing surface is formed on the external threaded part side of the head.

[0026] Alternatively, the pressing body can be a flexible pressing body that can be inserted into the second through hole, and it has the hardness to deform the pressing surface along the shape of the outer circumference of the inner tube by screwing it into the fastening thread.

[0027] To solve the above-mentioned technical problems, the tubular sleeve for the integrated inner and outer structure of the present invention is a tubular sleeve that can be externally fitted onto the outer circumferential surface of the outer tube and through which the inner tube can pass at the end of the fitting portion of the outer tube and the fitting portion of the inner tube. A first through hole and a second through hole are provided along the thickness direction on the outer circumferential surface near one end, and an internal thread is provided on the inner circumferential surface of the second through hole. It also features an L-shaped side cross-section pressing body and a fastening threaded part, wherein, The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. This pressing surface penetrates the first through hole and can press against the outer circumferential surface of the inner tube. The fastening threaded portion has an external threaded portion that can be screwed into the internal threaded portion, and a head provided at one end of the external threaded portion, and a press-in surface that can abut against the load-bearing surface is formed on the external threaded portion side of the head.

[0028] Alternatively, an external thread can be provided on the outer circumferential surface of one end of the outer tube, and an internal thread that can engage with the external thread can be provided on the inner circumferential surface of the tubular sleeve. Detailed Implementation

[0029] The first embodiment of the integrated inner and outer tube structure 10 of the present invention will be described in detail below with reference to the accompanying drawings, taking a music score holder as an example. like Figures 1 to 8 As shown, the integrated inner and outer tube structure 10 is used to fix the interlocking inner tube X1 and outer tube X2 in the length direction of the tube. It mainly consists of inner tube X1 and outer tube X2, tubular sleeve 54, pressing body 38 and fastening threaded part 48. The tubular sleeve 54 is installed and fixed on the outer peripheral surface of one end of the outer tube X2. The pressing body 38 has a pressing surface 34 that can press the outer peripheral surface 58 of the inner tube X1 from the outer peripheral surface 56 side of the tubular sleeve 54. The fastening threaded part 48 can press and fix the pressing body 38 against the outer peripheral surface 58 of the inner tube X1. The length, thickness, and cross-sectional shape of the inner tube X1 and the outer tube X2 can be selected according to the application. As described later, the fitting length of the inner tube X1 and the outer tube X2 is adjusted, thereby adjusting the overall length of the inner tube X1 and the outer tube X2.

[0030] For example, the inner tube X1 and the outer tube X2 are both hollow cylinders. The outer tube X2 is inserted into the inner tube X1 through one end opening of its inner circumferential surface 60, thus embedding the outer tube X2 into the inner tube X1. Furthermore, based on the viewpoint that the outer tube X2 is embedded in the inner tube X1, the outer tube X2 needs to be hollow, but it does not necessarily need to have a circular cross-section. On the other hand, the inner tube X1 does not necessarily need to be hollow; for example, it can be solid to ensure strength. When the outer tube X2 is fitted with the inner tube X1, the inner circumferential surface 60 of the outer tube X2 and the outer circumferential surface 58 of the inner tube X1 can be provided with a small gap C1 by using the fastening thread 48 to fix the outer tube X2 relative to the inner tube X1 in the length direction through the pressing body 38. This small gap C1 is, for example, 0.05 mm to 0.1 mm.

[0031] like Figures 2-4 As shown, a first through hole 16 is provided on the outer peripheral surface 56 of the tubular sleeve 54, and an internal thread 22 is provided at a position adjacent to the first through hole 16. The spacing between the two can be selected according to the purpose of the integrated inner and outer tube structure 10, as will be described later. More specifically, the tubular sleeve 54 is a hollow cylindrical shape that can be externally fitted into one end of the outer tube X2 from one end, and at the other end, the inner tube X1 is inserted into the other end in such a way that there is a predetermined gap between it and the inner circumferential surface 57 of the tubular sleeve 54. The tubular sleeve 54 is preferably made of metal and is in the shape of a hollow cylinder. Its inner circumferential diameter is set to be at least larger than the inner diameter of the inner tube X1 and the outer tube X2, but its shape is not necessarily cylindrical. For example, it can also be a cocoon shape with an expanded diameter in the center. The thickness th and the length L3 in the longitudinal direction of the tubular sleeve 54 can be set appropriately, as long as the inner tube X1 and the outer tube X2 that fit together can be fixed and held in the longitudinal direction of the tube, for example, a few millimeters or a few centimeters.

[0032] The tubular sleeve 54 is composed of a first outer part 53 and a second outer part 55. The first outer part 53 extends from one end to the outer tube X2, and its inner circumferential surface 57 is externally fitted into the outer tube X2, which faces the outer circumferential surface 50 of the outer tube X2 with a first predetermined gap. The second outer part 55 extends from one end to the inner tube X1, and its inner circumferential surface is externally fitted into the inner tube X1, which faces the outer circumferential surface of the inner tube X1 with a second predetermined gap. A first through hole 16 is provided in the first outer part 53. The diameter of the second outer part 55 is set to be smaller than the diameter of the first outer part 53. The second outer part 55 constitutes a reduced diameter part, and the first outer part 53 constitutes an expanded diameter part. An annular shoulder 94 is formed at the connection between the first outer part 53 and the second outer part 55. The annular shoulder 94 can be placed on the annular end face EN of the outer tube X2. The gaps between the inner circumferential surface 57 of the tubular sleeve 54 and the outer circumferential surface 58 of the inner tube X1, the gaps between the inner circumferential surface 57 of the tubular sleeve 54 and the outer circumferential surface 50 of the outer tube X2, and the gap C1 between the inner tube X1 and the outer tube X2 can be determined, for example, from the viewpoint of being suitable for use as a support for music, and are all, for example, 0.5 mm to 1 mm. In addition, the gap C1 between the inner tube X1 and the outer tube X2 can be eliminated by adjusting the width of the annular shoulder 94 and the positional relationship between the inner tube X1 and the outer tube X2 in the vertical direction. By tightening the fastening thread 48, the outer peripheral surface 58 of the inner tube X1 and the inner peripheral surface 57 of the tubular sleeve 54 are pressed and fixed together to the inner peripheral surface 60 of the outer tube X2. As a variation, an external thread can be provided on the side circumferential surface of one end of the outer tube X2, and an internal thread that can be screwed into the external thread can be provided on the inner circumferential surface of the tubular sleeve 54, so that the upper end height of the tubular sleeve 54 can be adjusted according to the screwing amount of the tubular sleeve 54 relative to the outer tube X2.

[0033] The first through hole 16 is configured to extend along the radial direction of the inner and outer tubes X1 and X2. More specifically, the first through hole 16 is an elongated opening, the width of which only needs to allow the pressing member 36 of the pressing body 38 to pass through along the thickness direction. As will be described later, since the pressing body 38 is fastened to the outer tube X2 by the fastening thread 48, the pressing body 38 does not need to pass through the first through hole 16 provided on the outer peripheral surface 50 of the outer tube X2 in an interference fit, and a gap is allowed between the periphery of the first through hole 16 and the outer peripheral edge of the pressing body 38.

[0034] like Figure 5 As shown, the pressing body 38 is positioned on the outer peripheral surface 56 of the tubular sleeve 54 and passes through the first through hole 16 to abut against the outer peripheral surface 58 of the inner tube X1. More specifically, the side cross-section shape of the pressing body 38 along the center line is L-shaped. The pressing body 38 has a load-bearing member 30 and a pressing member 36. The load-bearing member 30 has opposing planar portions 43. One of the planar portions 43A has a load-bearing surface 26 and a process hole 28 that extends through the thickness direction between the opposing planar portions 43. The pressing member 36 extends from one end 32 of the load-bearing member 30 to the opposite side of the load-bearing surface 26 and has opposing planar portions 41. A pressing surface 34 is provided at the top end. The load-bearing member 30 and the pressing member 36 are arranged orthogonally. The pressing member 36 has a length at least longer than the depth of the first through hole 16, and the process hole 28 is provided in the load-bearing member 30 at a position where the external thread 40 can be screwed into the internal thread 22 when the pressing member 36 is inserted into the first through hole 16. A process hole 68 is provided on the other end 33 side of the load-bearing component 30, and a through hole 66 with an internal thread on the inner circumferential surface is provided on the tubular sleeve 54. The external thread 70 can be screwed into the through hole 66 through the process hole 68, and the length of the external thread 70 is set in such a way that the top end of the external thread 70 does not abut against the outer circumferential surface 58 of the inner tube X1 when screwed in. Accordingly, when the fastening thread 48 is completely disengaged from the internal thread 22, the pressing body 38 can be prevented from falling off. The fastening force of the external thread 70 can be set according to this viewpoint, and the diameter of the external thread 70 can be smaller than the diameter of the external thread 40. As a variation, such as Figure 35 As shown, Figure 5 In this case, the process hole 28 through which the external thread portion 40 of the fastening thread portion 48 can pass is not formed by a closed inner circumferential surface that extends along the thickness direction of the load-bearing component 30, but only becomes the passage area of ​​the external thread portion 40 of the fastening thread portion 48, such as Figure 35 As shown, it can also be an open process hole 28, instead of being formed by a closed inner circumferential surface.

[0035] The pressing surface 34 has a hardness that prevents deformation due to pressing against the outer peripheral surface 58 of the inner tube X1, and is formed in a curved shape along the outer peripheral surface 58 of the inner tube X1 so as to contact the outer peripheral surface 58 of the inner tube X1. For example, if the outer peripheral surface 58 of the inner tube X1 is the outer surface of a cylinder, the cross-section of the pressing surface 34 is an arc shape corresponding to its diameter. In this case, unlike the fastening threaded portion 48, it is not necessary to rotate the pressing body 38 itself toward the outer peripheral surface 58 of the inner tube X1. Therefore, by facing the arc-shaped cross-section toward the outer peripheral surface 58 of the inner tube X1, the pressing surface 34 can be pressed against the outer peripheral surface 58 of the inner tube X1. The load-bearing surface 26 is formed as an annular protrusion around the process hole 28. The width of the annular protrusion is set such that the pressing surface 46 abuts against the load-bearing surface 26 by screwing in the fastening thread 48, and the pressing load is transmitted to the pressing body 38 through the load-bearing surface 26, so that the pressing surface 34 can press the outer peripheral surface 58 of the inner tube X1. As a variation, the load-bearing surface 26 may also be formed as a protruding surface on the end side of the load-bearing component 30.

[0036] By screwing in the fastening thread 48, the load-bearing surface 26 bears the pressing load, and at the same time, the pressing component 36 penetrates the first through hole 16. Accordingly, the pressing surface 34 presses the outer peripheral surface 58 of the inner tube X1. At this time, by forming a gap between the flat portion 41A on one side of the pressing component 36 and the first through hole 16, the other end of the load-bearing component 30 is inclined towards the outer peripheral surface of the inner and outer tubes X1 and X2. A wedge effect is generated on the gap side of the pressing surface 34, and the pressing of the fastening thread 48... The pressure increases based on the lever principle. To achieve the aforementioned wedge effect and increase the pressing force, the first through hole 16 is set to span across the outer peripheral surface 50 of the outer tube X2 in the length direction of the outer tube X2, passing through the center of the internal thread portion 22 of the outer tube X2. The thickness t2 of the load-bearing component 30 and / or the size of the first through hole 16 are set, and the shape of the pressing surface 34 is set such that the amount of expansion in the circumferential direction of the outer tube X2 and the amount of expansion in the length direction of the outer tube X2 when the first through hole 16 is inserted are within a specified range. The inner tube X1 and the outer tube X2 are both cylindrical. The inner tube X1 and the outer tube X2 are fixed by the pressing of the tubular sleeve 54. The outer peripheral surface 58 of the inner tube X1 on the opposite side of the pressing and fixing part of the pressing surface 34 is pressed and fixed to the inner peripheral surface 57 of the second outer part 57 of the tubular sleeve 54 in a vertical line contact manner. The outer tube X2 is fixed and held on the inner tube X1 by two supports. As a variation, the length L3 of the tubular sleeve 54 or the length L2 of the load-bearing component 30 can be set by directly pressing the top end of the external thread portion 40 of the fastening thread portion 48 against the outer peripheral surface 50 of the outer tube X2, provided that there is no risk of scratching or denting of the outer peripheral surface 50 through the material of the outer tube X2 and the surface processing.

[0037] The overall planar shape of the pressing surface 34 (hereinafter referred to as its projected shape on the plane) is an inverted U-shape that extends through the first through hole 16 and opens into the second through hole 18, and is concentrically arranged around the second through hole 18. The strip width WD is constant and is set to ensure the required gap with the first through hole 16, and the strip arc length is determined based on the wedge effect or lever principle described later, and is a maximum semicircle. As a variation, the overall planar shape of the pressing surface 34 can be an inverted V-shape that can penetrate the first through hole 16 and open into the second through hole 18, and is disposed around the second through hole 18. The inverted U-shaped and inverted V-shaped pressing surfaces 34 are respectively configured to be axially symmetrical about the length of the inner and outer tubes X1 and X2 that pass through the center of the inner threaded part 22. Regarding the overall planar shape of the pressing surface 34 of the L-shaped pressing body 38, for the inverted U-shaped strip formed by a pair of parallel linear parts and a curved part connecting the ends of each linear part, each linear part of the pair of linear parts only needs to be able to fix the inner and outer tubes X1 and X2 in the vertical direction, and does not necessarily have to be straight. For example, it can also be part of an ellipse as a whole, and be entirely composed of curved parts. To fix the inner and outer tubes X1 and X2 in the vertical direction and prevent relative rotation of the inner and outer tubes X1 and X2 about the length direction of the tube, the overall planar shape of the pressing surface 34 of the L-shaped pressing body 38 is preferably concentric with the internal thread portion. It is a quarter-circular strip with one end located in the length direction of the tube and the other end located in the circumferential direction of the tube. Alternatively, it can be an L-shaped strip formed by a longitudinal line extending along the length direction of the tube and a transverse line extending along the circumferential direction of the tube from one end of the longitudinal line portion around the internal thread portion. The overall length, width, and spacing of the strip from the internal thread portion can be appropriately selected. As a further variation, the overall planar shape of the pressing surface 34 can also be an L-shape that can penetrate the first through hole 16 and is disposed around the second through hole 18. In this case, by arranging one side of the L-shape to extend laterally along the length direction of the inner and outer tubes X1 and X2 in the internal thread portion 22, and the other side of the L-shape to extend circumferentially along the inner and outer tubes X1 and X2 below the internal thread portion 22, similar to the inverted U-shape and inverted V-shape, the other part of the L-shape functions to fix and hold the inner and outer tubes X1 and X2 in the vertical direction, while the other side of the L-shape functions to suppress the relative rotation of the inner and outer tubes X1 and X2 about the length direction of the tube, for example, it can be effectively used for applications such as brackets. As a further variation, the overall planar shape of the pressing surface 34 can also be a transversely elongated shape that can penetrate the first through hole 16 and is transversely cut in the length direction of the tube passing through the center of the second through hole 18. The cross-section of the pressing member 36 is a fixed rectangle, and a pressing surface 34 is formed on its end face. However, as a variation, as long as the desired gap can be ensured so that the first through hole 16 can pass through, the end of the pressing member 36 forming the pressing surface 34 can be formed into a gradually expanding tapered shape as it approaches the pressing surface 34.

[0038] like Figure 6 As shown, the fastening threaded portion 48 is a structure for pressing and fixing the pressing body 38 to the outer peripheral surface 58 of the inner tube X1. The fastening threaded portion 48 has a handle portion 82 and an external threaded portion 40 extending downward from the lower surface of the handle portion 82. The external threaded portion 40 can be screwed into the internal threaded portion 22, and a press-in surface 46 is formed on the lower surface around the external threaded portion 40. After adjusting the fitting position of the inner tube X1 relative to the outer tube X2, the outer threaded part 40 is screwed into the inner threaded part 22 by tightening the threaded part 48, and at the same time the pressing body 38 passes through the first through hole 16 and is pressed and fixed on the outer peripheral surface 58 of the inner tube X1. The tightening torque of the tightening thread 48 can be adjusted by the diameter D of the head 44 and / or the pitch of the external thread 40 (internal thread 22). The threaded portion 48 has a head 44 at the end of the shank 82 opposite to the end of the external threaded portion 40, which can be rotated by pinching with fingers. The diameter D of the head 44 is preferably as large as possible so that the head 44 can be rotated by pinching with fingers with less force. From the point of view of anti-slip, multiple shallow grooves can also be provided at intervals in the circumferential direction. The distance between the first through hole 16 and the internal thread portion 22 is set such that the pressing member 36 of the pressing body 38 can be inserted into the first through hole 16, and the external thread portion 40 of the fastening thread portion 48 can pass through the process hole 28 of the pressing member 36. For the fastening threaded part 48 to fix and retain the inner and outer tubes X1 and X2, the diameter D of the head 44 and / or the pitch of the external threaded part 40 can be set by tightening the fastening threaded part 48 by hand to fully fix and retain the inner and outer tubes X1 and X2.

[0039] Regarding the purpose of the integrated inner and outer tube structure 10, the first through hole 16 is configured to extend circumferentially along the inner and outer tubes X1 and X2, with the inner and outer tubes X1 and X2 facing the vertical direction, and to support a weight at a specified height through either the inner or outer tubes X1 and X2. In particular, when using the integrated inner and outer tube structure 10, and fixing the weight at a specified height by adjusting the fitting length of the inner and outer tubes X1 and X2 extending in the vertical direction, based on the view that the weight of the weight is supported by the friction between the pressing surface 34 of the pressing body 38 and the outer peripheral surface 58 of the inner tube X1, the greater the resistance of the pressing surface 34 of the pressing body 38 to the outer peripheral surface 58 of the inner tube X1, that is, the greater the fastening force of the fastening thread 48, the better. Therefore, since it is necessary to withstand a large fastening force, the pressing body 38, the fastening thread 48, and the inner and outer tubes X1 and X2 constituting the integrated inner and outer tube structure 10 are preferably made of metal.

[0040] As a variation, from the perspective of lightweighting, the integrated inner and outer tube structure 10 can also be made of resin. In particular, from the perspective of ensuring the strength around it even when the opening of the first through hole 16 and the internal thread portion 22 is provided, the thickness can also be ensured.

[0041] The following section specifically explains the method for fixing and maintaining the inner and outer tubes X1 and X2 in the existing interlocking inner and outer tubes X1 and X2: The stage of preparing an L-shaped side cross-section pressing body 38, a tubular sleeve 54, and a fastening threaded portion 48, wherein the pressing body 38 has a load-bearing component 30 and a pressing component 36. The load-bearing component 30 has a load-bearing surface 26 and a process hole 28. The pressing component 36 extends from one end 32 of the load-bearing component 30 to the side opposite to the load-bearing surface 26 and has a pressing surface 34 at the top end. The tubular sleeve 54 has a first through hole 16 and a second through hole 18 on its outer peripheral surface. An internal threaded portion 22 is provided on the inner peripheral surface of the second through hole 18. The fastening threaded portion 48 has an external threaded portion 40 that can be screwed into the internal threaded portion 22 and has a pressing surface 46 that can abut against the load-bearing surface 26. The stage in which a tubular sleeve 54 with a circular cross-section on the inner circumferential surface is embedded in the upper end of the outer tube X2; The stage of embedding the inner tube X1 into the tubular sleeve 54 or the outer tube X2; The stage of rotating the tubular sleeve 54 to the desired rotation position with the length direction of the outer tube X2 as the center; By tightening the fastening thread 48, the tubular sleeve 54 is pressed from the outside towards the outer peripheral surface 58 of the inner tube X1 in the thickness direction of the tubular sleeve 54. This fixes the tubular sleeve 54 in the desired rotational position with the outer tube X2 as the center. Furthermore, the outer peripheral surface 58 of the inner tube X1 on the opposite side is pressed against the inner peripheral surface 60 of the tubular sleeve 54 or the outer tube X2, thereby fixing the inner and outer tubes X1 and X2 together in the length direction. The fixed holding stage has the following steps: by forming a gap between the flat portion 41A on one side of the second through hole 18 of the pressing member 36 and the second through hole 18, the other end of the load-bearing member 30 is tilted toward the outer peripheral surface of the inner and outer tubes X1 and X2, and a wedge effect is generated at the corner of the edge portion of the pressing surface 34 including the load-bearing member 30 relative to the outer peripheral surface 58 of the inner tube X1, and the pressing force of the fastening thread portion 48 is increased based on the lever principle.

[0042] It may also have the following stages: by pressing the tubular sleeve 54 from the outside toward the outer peripheral surface 50 of the outer tube X2 in the thickness direction of the tubular sleeve 54, the tubular sleeve 54 is fixed in the desired rotational position with the length direction of the outer tube X2 as the center, and the outer peripheral surface opposite to the outer tube X2 is pressed onto the inner peripheral surface 57 of the tubular sleeve 54, thereby fixing and holding the inner and outer tubes X1 and X2 together in the length direction. Alternatively, the inner circumferential surface 57 of the tubular sleeve 54 may be provided with a reduced diameter portion larger than the diameter of the inner tube X1 and an expanded diameter portion larger than the diameter of the outer tube X2. An annular shoulder 94 may be formed at the connection between the reduced diameter portion and the expanded diameter portion. The annular shoulder 94 may be placed on the annular end face EN of the outer tube X2, so that the tubular sleeve 54 may rotate at the desired rotational position with the length direction of the outer tube X2 as the center.

[0043] The following example, using a music stand as an example, illustrates how the integrated inner and outer tube structure 10 can be applied to existing music stand supports. like Figure 1 As shown, the existing music stand support is configured such that inner and outer tubes X1 and X2 fit together. The music stand is connected to the upper end of the inner tube X1, and a tripod LG is connected to the lower end of the outer tube X2 to keep the music stand support upright. The fit between the lower end of the inner tube X1 and the upper end of the outer tube X2 is fixed by threads, for example, in a height-adjustable manner. The threaded part passes through the through hole of the outer tube X2 laterally, and the top end of the threaded part abuts against the outer peripheral surface of the inner tube X1 for fixation.

[0044] First, release the threaded fastener and remove the threaded part. Then, adjust the engagement position between the lower end of the inner tube X1 and the upper end of the outer tube X2 according to the desired height of the music stand F. In this position, support the inner tube X1 with one hand, and simultaneously use the other hand to insert the tubular sleeve 54 of the integrated inner and outer tube structure 1 into the upper end of the outer tube X2 through one opening, so that the annular shoulder 94 of the tubular sleeve 54 rests on the annular end face EN of the outer tube X2. With the tubular sleeve 54 covering the upper end of the outer tube X2, a specified gap is ensured between the inner circumferential surface 57 of the tubular sleeve 54 and the outer circumferential surface 50 of the outer tube X2 and the outer diameter surface 58 of the inner tube X1. The tubular sleeve 54 is supported on the upper end of the outer tube X2 and can rotate freely about the length direction of the inner and outer tubes X1 and X2. Next, use your other hand to rotate the tubular sleeve 54 around the length direction of the inner and outer tubes X1 and X2, and position it in the desired rotation position, for example, in the case of right-handedness, in a position where the tightening operation of the threaded part 48 can be performed with the right hand.

[0045] Next, support the inner tube X1 with one hand while tightening the fastening thread 48 with the other hand, thereby stopping the rotation of the tubular sleeve 54 around the length direction of the inner and outer tubes X1 and X2, and fixing the inner and outer tubes X1 and X2 to each other, and setting the music stand F at the desired height. More specifically, by tightening the threaded part 48 through the process hole 28, the external threaded part 40 is screwed into the internal threaded part 22, and at the same time, the pressing body 38 passes through the first through hole 32 of the first external insert 53, so that the pressing surface 34 contacts the outer peripheral surface 58 of the inner tube X1. Simultaneously, the outer peripheral surface 58 of the inner tube X1, opposite to the surface contact portion of the pressing surface 34 relative to the inner tube X1, is pressed and fixed to the inner peripheral surface 60 of the outer tube X2 at the fitting portion of the inner and outer tubes X1 and X2. Then, the tightening threaded part 48 is screwed in. Previously, the tubular sleeve 54, which was installed on the outer circumferential surface of one end of the outer tube X2, could rotate freely about the length direction of the inner and outer tubes X1 and X2. By screwing in the fastening thread 48, the rotation of the tubular sleeve 54 could be fixed, and the inner and outer tubes X1 and X2 could be fixed to each other in the length direction of the inner and outer tubes X1 and X2. In order to make this integrated inner and outer tube structure 10 suitable for music support, the ease of use when adjusting the height of the support can be improved through a simple structure.

[0046] While referring to Figure 7 The function of the L-shaped pressing body 38 is explained. The load-bearing component 30 of the L-shaped pressing body 38 is orthogonal to the pressing component 36. The first through hole 16 and the second through hole 18, which is the internal thread portion 22, of the tubular sleeve 54 are orthogonal to the length direction of the tubular sleeve 54 and are arranged along the thickness direction of the tubular sleeve 54. With the pressing surface 34 of the pressing member 36 of the L-shaped pressing body 38 inserted into the first through hole 16, the external thread 40 of the fastening thread 48 passes through the process hole 28 of the load-bearing member 30 of the L-shaped pressing body 38 and is screwed into the second through hole 18 of the tubular sleeve 54. In this state, the load-bearing member 30 is parallel to the outer surface 56 of the tubular sleeve 54, that is, the pressing member 36 is orthogonal to the outer surface 56 of the tubular sleeve 54.

[0047] By screwing in the fastening thread 48, the pressing surface 46 of the head 44 abuts against the load-bearing surface 26 of the load-bearing component 30 of the L-shaped pressing body 38, so that the load-bearing component 30 of the L-shaped pressing body 38 is close to the outer surface 56 of the tubular sleeve 54, and the pressing surface 34 of the L-shaped pressing body 38 is close to the outer peripheral surface 58 of the inner tube X1 through the first through hole 16. By further screwing in the fastening thread 48, since the pressing surface 34 of the L-shaped pressing body 38 is formed as an arc-shaped curved surface of a specified diameter along the shape of the outer peripheral surface 58 of the inner tube X1, the entire inner tube X1 is pressed in a surface contact manner on the outer peripheral surface 58. By further screwing in the fastening thread 48, the L-shaped pressing body 38 forms a single-point support at its end due to the pressing surface 34 of the pressing member 36. Therefore, the load-bearing member 30 of the L-shaped pressing body 38 begins to tilt towards the end 33 on the side opposite to the end 32 on the pressing member 36, closer to the outer surface 56 of the tubular sleeve 54. Accordingly, the contact between the pressing surface 34 of the pressing member 36 and the outer peripheral surface 58 of the inner tube X1 changes from surface contact to line contact.

[0048] More specifically, the contact area of ​​the pressing surface 34 of the pressing member 36 decreases as it approaches the edge portion 55 extending circumferentially along the tubular sleeve 54 toward the load-bearing member 30, and the edge portion 55 of the pressing surface 34, i.e., the corner where the pressing surface 34 intersects with one of the flat portions 41A, abuts against the outer peripheral surface 58 of the inner tube X1, thereby generating a so-called wedge effect and increasing the pressing force on the outer peripheral surface 58 of the inner tube X1. Accordingly, compared to the case where the pressing surface 34 of the L-shaped pressing body 38 presses the outer peripheral surface 58 of the inner tube X1 in a surface contact manner, for example, when a weight such as a music stand or a loudspeaker is supported on the upper end of the inner tube X1, if the weight causes the inner and outer tubes X1 and X2 to be unable to remain fixed to each other, and the inner tube X1 supporting the weight slides downward relative to the outer tube X2 over time, the aforementioned wedge effect will further play a role, thereby strengthening the fixation of the inner tube X1 relative to the outer tube X2 in the downward direction of the inner and outer tubes X1 and X2 extending in the vertical direction. Therefore, regarding the positional relationship between the pressing surface 34 of the L-shaped pressing body 38 and the internal thread portion 22, when the interval between the pressing surface 34 of the L-shaped pressing body 38 and the internal thread portion 22 is the same, it is advantageous to place the pressing surface 34 of the L-shaped pressing body 38 below the internal thread portion 22, that is, to place the first through hole 16 below the internal thread portion 22. Compared with placing it above, this is beneficial to prevent the inner tube X1 from sliding downward relative to the outer tube X2 by increasing the wedge effect. The maximum tilt angle θMAX of the L-shaped pressing body 38 is determined based on the position of the process hole 28 on the load-bearing component 30, the distance between the outer peripheral surface 58 of the inner tube X1 and the outer peripheral surface 56 of the tubular sleeve 54 (the gap C1 between the inner and outer tubes X1 and X2 + the thickness th of the tubular sleeve 54) and / or the gap C between the L-shaped pressing body 38 and the first through hole 16. The thickness th of the tubular sleeve 54 and / or the gap C between the L-shaped pressing body 38 and the first through hole 16 are determined based on the degree of reinforcement expected to be maintained by the inner and outer tubes X1 and X2 in the vertical direction. For example, when the tubular sleeve 54 is made of resin, based on the viewpoint of ensuring strength, the thickness th of the tubular sleeve 54 is larger, the opening area of ​​the first through hole 16 is smaller, and the gap C is narrower. On the other hand, the position of the process hole 28 on the load-bearing member 30 is adjusted accordingly to the end 33 on the opposite side of the end 32 of the pressing member 36. When the tubular sleeve 54 is made of metal, the thickness th of the tubular sleeve 54 can be smaller, and the opening area of ​​the first through hole 16 can be larger.

[0049] In this case, the edge 55 of one of the planar portions 41A on the side of the first through hole 16 of the pressing member 36 in the pressing surface 34 is used as the point of action, the edge of the other planar portion 41B in the pressing surface 34 facing the planar portion 41A is used as the fulcrum, and the center of the process hole 28 of the load-bearing member 30 is used as the force point. Through the lever principle, the tightening force of the threaded portion 48 is increased according to the ratio of the distance D2 between the fulcrum and the force point to the distance D1 between the fulcrum and the point of action. The pressing force on the outer peripheral surface 58 of the inner tube X1 at the point of action is increased. The smaller the distance D1 is, the larger the distance D2 is. In other words, the smaller the width of the pressing surface 34 along the length direction of the inner and outer tubes X1 and X2, the closer the position of the process hole 28 on the load-bearing member 30 is to the other end 33. Accordingly, when the tightening force of the threaded portion 48 is fixed, the inner and outer tubes X1 and X2 can be more firmly fixed and maintained. In this respect, in relation to the aforementioned wedge effect, when the size of the first through hole 16 is fixed, the smaller the width of the pressing surface 34 along the length direction of the inner and outer tubes X1 and X2, the larger the gap C formed between the flat portion 41A on one side of the first through hole 16 of the pressing member 36 and the inner circumferential surface of the first through hole 16, thereby increasing the maximum tilt angle θMAX of the L-shaped pressing body 38, and thus being able to adjust the wedge effect and increase the tightening force of the fastening thread portion 48 based on the lever principle. The tightening force of the fastening threaded portion 48 can also be increased based on the lever principle by setting the ratio of the interval between the first through hole 16 and the process hole and the interval between the first through hole 16 and the second through hole 18. In summary, the amount of expansion of the pressing surface 34 in the length direction of the inner and outer tubes X1 and X2 can be related to the wedge effect and the increase of the tightening force of the fastening thread 48 based on the lever principle. On the other hand, it is preferable to set the expansion amount of the pressing surface 34 in the circumferential direction of the inner and outer tubes X1 and X2, which is orthogonal to the length direction of the inner and outer tubes X1 and X2. This is because it is considered that within a range of 90 degrees circumferentially expanding from the center of the internal thread hole 22, the pressing force component of the fastening force of the fastening thread 48 on the outer peripheral surface 58 of the inner tube X1 gradually decreases, and the pressing surface 34 can expand circumferentially across the length direction of the inner and outer tubes X1 and X2 passing through the center of the internal thread hole 22.

[0050] In summary, by screwing in the fastening thread 48, the load-bearing surface 26 bears the pressing load through the pressing surface 46, while the pressing member 36 penetrates the first through hole 16. Accordingly, when the pressing surface 34 presses against the outer peripheral surface 58 of the inner tube X1, a gap is formed between the flat portion 41A on one side of the load-bearing member 30 of the pressing member 36 and the inner peripheral surface of the first through hole 16, causing the other end of the load-bearing member 30 to tilt towards the outer peripheral surface of the inner and outer tubes, and causing the flat portion 41B on the other side to abut against the inner peripheral edge of the first through hole 16. This creates a wedge effect at the corner of the edge portion of the pressing surface 34 that tilts towards the outer peripheral surface of the inner and outer tubes. Simultaneously, the pressing force of the end edge of the flat portion 41A of the pressing surface 34 on the outer peripheral surface 58 of the inner tube X1 increases based on the lever principle. By achieving this wedge effect and increasing the pressing force, under a given weight of the supported object, an L-shaped pressing... The pressure body 38 exerts a wedge effect by adjusting the inclination angle of the gap between the outer peripheral surface 58 of the inner tube X1 and the inner peripheral surface 60 of the outer tube X2. Simultaneously, the width between the two ends of the pressing surface 34 and / or the position of the process hole 28 in the load-bearing member 30 are set to ensure the inner and outer tubes are fixed in a specified manner. Alternatively, a gap can be formed between the flat portion 41A of one side of the pressing member 36 on the load-bearing member 30 side and the inner peripheral surface of the first through hole 16, causing the other end 33 of the load-bearing member 30 to tilt towards the outer peripheral surface of the inner and outer tubes, while the flat portion 41B of the other side abuts against the inner peripheral end edge of the first through hole 16. Accordingly, the pressing force of the end edge of the flat portion 41A of the pressing surface 34 on the outer peripheral surface 58 of the inner tube X1 is increased based on the lever principle. To achieve this increase in pressing force, the width between the two ends of the pressing surface 34 and / or the position of the process hole in the load-bearing member 30 can be set.

[0051] The pressing surface 34 is formed as a curved surface along the outer peripheral surface 58 of the inner tube X1. More specifically, it can be set to have the same radius of curvature as the circular outer peripheral surface 58, but it can also be set to have a different radius of curvature than the circular outer peripheral surface 58, depending on the situation. More specifically, the radius of curvature of the pressing surface 34 can be set to be slightly smaller than the radius of curvature of the circular outer circumferential surface 58. Accordingly, the entire surface of the pressing surface 34 does not abut against the outer circumferential surface 58 of the inner tube X1. The two circumferential edges of the inner and outer tubes X1 and X2 of the pressing surface 34 abut against the outer circumferential surface 58 of the inner tube X1. A gap can be left between the two end edges of the pressing surface 34 and the outer circumferential surface 58 of the inner tube X1. Accordingly, a wedge effect can be concentrated on the two circumferential edges of the inner and outer tubes X1 and X2 in one of the length directions of the pressing surface 34. As a variation, such as Figure 34 As shown, two curved surfaces 34A and 34B can also be used as the pressing surface 34 to increase the wedge effect. More specifically, by providing a curved surface 34B connected to the edge of the flat portion 41A with a different degree of curvature and a curved surface 34A connected to the edge of the flat portion 41B of the other side, as the load-bearing member 30 of the L-shaped pressing body 38 tilts towards the end 33 on the opposite side of the end 32 on the pressing member 36 side, which is closer to the outer surface 56 of the tubular sleeve 54, the contact surface with the outer peripheral surface 58 of the inner tube X1 shifts from the curved surface 34A to the curved surface 34B, thereby enhancing the wedge effect on the outer peripheral surface 58 of the inner tube X1.

[0052] For example, when multiple instruments are played in front of an audience, such as in a large jazz band, the music stand supports placed in front of each instrumentalist are not foldable, lightweight music stand supports, but rather music stand supports with thicker tubes and greater weight. By arranging multiple such heavy music stand supports in a neatly arranged rotating position, a unified appearance can be easily achieved. When changing the height of the music stand F, simply loosen the fastening thread 48, adjust the engagement position of the inner tube X1 relative to the outer tube X2, and then tighten it again. In particular, when lowering the height of the music stand F, only one hand needs to loosen the fastening thread 48 and quickly tighten it, without having to use the other hand to support the inner tube X1 as it falls due to its own weight.

[0053] In summary, firstly, the inner tube X1 is adjusted to the desired height relative to the outer tube X2. Based on this, the annular shoulder 94 formed at the boundary between the second outer part 55 and the first outer part 53 of the tubular sleeve 54 is placed on the annular end face EN of the outer tube X2. Accordingly, the tubular sleeve 54 can rotate freely about the length direction of the inner and outer tubes X1 and X2. Therefore, the inner tube X1 can be held with one hand while the tubular sleeve 54 can be easily rotated to the desired rotation position with the other hand.

[0054] Second, by screwing the fastening threaded portion 48 onto the tubular sleeve 54, the pressing surface 34 of the L-shaped pressing body 38 abuts against the outer peripheral surface 58 of the inner tube X1, and the outer peripheral surface 58 of the inner tube X1 on the opposite side of the diameter direction is pressed against the inner peripheral surface of the second outer part 55 of the tubular sleeve 54, thereby fixing the inner tube X1 and the outer tube X2 to the tubular sleeve 54 respectively. Therefore, even if there is a gap in the fitting part of the inner and outer tubes X1 and X2, the inner tube X1 and the outer tube X2 can be fixedly held in the longitudinal direction of the tubes, and the rotation of the tubular sleeve 54 about the longitudinal direction of the inner and outer tubes X1 and X2 is fixed.

[0055] Furthermore, if the width of the annular shoulder 94 formed at the boundary between the second outer part 55 and the first outer part 53 of the tubular sleeve 54 is set to be large, then by preparing various types of pressing bodies 38 in advance, the tubular sleeve 54 with universal applicability to existing music stands with inner and outer tubes X1 and X2 can be applied. At the same time, by selecting the type of L-shaped pressing body 38, it is not necessary to replace the music stand, but only to add a fixing and holding fixture with tubular sleeve 54, L-shaped pressing body 38 and fastening threaded part 48.

[0056] On the other hand, the width of the annular shoulder 94 of the tubular sleeve 54 is strictly set for the existing inner and outer tubes X1 and X2, and a customized tubular sleeve 54 with no gap in the fitting part of the inner and outer tubes X1 and X2 is made. Accordingly, by fastening the threaded part 48, the L-shaped pressing body 38 not only presses the inner and outer tubes X1 and X2 onto the inner circumferential surface 57 of the tubular sleeve 54, but also presses the outer circumferential surface 58 of the inner tube X1 onto the inner circumferential surface 60 of the outer tube X2 in a line contact manner on the opposite side of the diameter direction of the pressing surface 34 of the L-shaped pressing body 38 at the fitting part of the inner and outer tubes X1 and X2. This allows the inner tube X1 and the outer tube X2 to be more firmly fixed to each other in the length direction of the tube. For example, it is effective for supports for heavy objects such as music amplifiers and large musical instruments. Furthermore, by screwing in the fastening thread 48, the inner and outer tubes X1 and X2 are fixed and held by the tubular sleeve 54. At the same time, after the tubular sleeve 54 is rotated around the length direction of the inner and outer tubes X1 and X2, the external thread 70 is screwed into the internal thread 66 of the tubular sleeve 54 through the process hole 68 of the L-shaped pressing body 38. Accordingly, even when the external thread 40 of the fastening thread 48 is completely removed from the internal thread 22 of the tubular sleeve 54 and the L-shaped pressing body 38 is in a free state, the external thread 70 can prevent the L-shaped pressing body 38 from falling off the tubular sleeve 54 in advance. In the case of medical supports such as infusion sets, monitors, and lighting devices, casters 96 are usually installed at the lower part of the inner and outer tubes X1 and X2. Since they need to be moved to multiple treatment sites, the supports vibrate up and down due to uneven ground. Therefore, there is a high demand for firmly fixing the fitting and fixing parts of the inner and outer tubes X1 and X2. Furthermore, there is a high demand for adjusting the orientation of infusion sets, monitors, and lighting devices during treatment. Thus, compared to music supports, which typically need to be moved to the performance site and have lower demands for adjusting the height and orientation of music stands, microphones, amplifiers, etc. during performance, the integrated inner and outer tube structure of the present invention is more practical.

[0057] As a variation, if a tubular sleeve 54 is used, the inner and outer tubes X1 and X2 can be fixedly held even when the inner tube X1 is pulled out from the outer tube X2. More specifically, since the pressing surface 34 of the pressing body 38 presses against the outer peripheral surface 58 of the inner tube X1, it is not necessary to directly fix and hold the inner and outer tubes X1 and X2 through the fitting part of the inner and outer tubes X1 and X2. It is only necessary to indirectly fix and hold the inner and outer tubes X1 and X2 through the tubular sleeve 54. Therefore, even when the inner and outer tubes X1 and X2 do not have the fitting part, in other words, even when the overall length of the inner and outer tubes X1 and X2 is relatively long, it is still possible to fix and hold the inner and outer tubes X1 and X2.

[0058] According to the integrated inner and outer tube structure 10 with the above structure, when the inner and outer tubes X1 and X2 are fitted together to form an integrated structure, the degree of fixation of the fitting part becomes a consideration depending on the application, such as a music stand, microphone stand, or medical stand, such as an infusion stand or monitor stand. However, a first through hole 16 and a second through hole 18 are provided on the outer peripheral surface near the fitting part of the tubular sleeve 54 or the outer tube X2, and an internal thread 2 is provided on the inner peripheral surface of the second through hole 18. 2. Utilizing the L-shaped side cross-section pressing body 38 and the fastening threaded portion 48, the load-bearing component 30 of the pressing body 38 is inserted into the first through hole 16 from the pressing surface 34 at the top. Simultaneously, by screwing in the fastening threaded portion 48, the load-bearing surface 26 bears the pressing load, while the pressing surface 34 presses against the outer peripheral surface 58 of the inner tube X1. At this time, a gap is formed between the flat portion 41A on one side of the pressing component 36 and the first through hole 16, and the other end 33 of the load-bearing component 30 laterally... The outer peripheral surfaces of the inner and outer tubes X1 and X2 are inclined, creating a wedge effect on the gap side of the pressing surface 34. The pressing force of the fastening thread 48 is increased based on a lever principle with the portion of the pressing surface 34 opposite to the gap side as the fulcrum, the load-bearing surface 26 as the force point, and the gap side of the pressing surface 34 as the point of action. To achieve this increase in pressing force, the first through hole 16 is configured to span across the outer peripheral surface 50 of the outer tube X2, passing through the center of the inner thread 22. Along the length direction, the thickness of the load-bearing component 30 and / or the size of the first through hole 16 are set, and the shape of the pressing surface 34 is set such that when the first through hole 16 is inserted, the circumferential expansion of the outer tube X2 and the longitudinal expansion of the outer tube X2 are within a specified range. Therefore, in order to fix and retain the inner and outer tubes X1 and X2 with the required fixing and retaining force according to the application, the threaded part 48 is tightened by human power, thereby easily and adequately fixing and retaining the inner and outer tubes X1 and X2.

[0059] Furthermore, after the pressing surface 34 of the L-shaped pressing body 38 presses the outer peripheral surface 58 of the inner tube X1 in a surface contact manner, it changes to a line contact by tilting the L-shaped pressing body 38. In addition, as long as the above-mentioned wedge effect can be utilized, the L-shaped pressing body 38 can also tilt before the pressing surface 34 of the L-shaped pressing body 38 contacts the outer peripheral surface 58 of the inner tube X1, so that the pressing surface 34 of the L-shaped pressing body 38 does not make surface contact. The intersection angle between the load-bearing member 30 and the pressing member 36 of the L-shaped pressing body 38, and / or the orientation (inclination relative to the thickness direction of the tubular sleeve 54) of the first through hole 16 and the second through hole 18 which is the internal thread portion 22 provided in the tubular sleeve 54, can be appropriately set, as long as the so-called wedge effect can be achieved by screwing in the fastening thread portion 48.

[0060] The second embodiment of the present invention will now be described. In the following description, structural elements that are the same as those in the first embodiment will be labeled with the same reference numerals, and their descriptions will be omitted. The following description will refer to... Figure 8 and Figure 9 The features of this embodiment will be described in detail below. The second embodiment of the present invention is a support that serves as an integral structure of inner and outer tubes. In order to fix and retain the inner tube and outer tube in the vertical direction at the fitting part, an L-shaped pressing body 38 and a fastening thread 48 are used. By fastening the fastening thread 48, the pressing surface 34 of the L-shaped pressing body 38 presses the outer peripheral surface of the inner tube. This is the same as the first embodiment. However, the second embodiment of the present invention is characterized in that the object supported by the support is a lightweight music stand in the first embodiment, while in this embodiment it is a loudspeaker S, which is a heavy object. Correspondingly, a single L-shaped pressing body 38 is used in the first embodiment, while a pair of L-shaped pressing bodies 38 are used in this embodiment. More specifically, such as Figure 8 and Figure 9 As shown, a pair of L-shaped pressing bodies 38 have the same structure and are spaced apart in the length direction of the inner and outer tubes X1 and X2 separated by the second through hole 18. One of them is located above, with the U-shaped part extending along the length direction of the tube and the opening facing downward toward the through hole. The other one is located below, with the U-shaped part extending along the length direction of the tube and the opening facing upward toward the through hole. The spacing between the first through hole 16 and the second through hole 18 may be different at the upper first through hole 16 and the lower first through hole 16. In addition, the overall planar shape of the L-shaped pressing body 38 can be any one of the following: long U-shaped, short U-shaped, long V-shaped, short V-shaped, longitudinally elongated, or horizontally elongated. The overall planar shapes of a pair of L-shaped pressing bodies 38 can also be different. Alternatively, the tubular sleeve 54 may be used as in the first embodiment, or it may not be used. In summary, in each of the pair of L-shaped pressing bodies 38, similar to the first embodiment, the inner and outer tubes X1 and X2 can be fixed and held by the wedge effect and the lever principle, and a fastening force can be applied to the pair of L-shaped pressing bodies 38 by fastening a single fastening thread 48. The pair of L-shaped pressing bodies 38 do not need to have the same structure. For example, one of them can have an overall planar shape of a long U-shape and the other can have an overall planar shape of the same shape, but the length of the pressing part 36 of one of them is different from that of the pressing part 36 of the other. Accordingly, the wedge effect and lever principle of the pair of L-shaped pressing bodies 38 are different.

[0061] Accordingly, the external thread 40 of the fastening thread 48 passes through the process hole 28 of the upper L-shaped pressing body 38 and the process hole 28 of the lower L-shaped pressing body 38, and is fastened to the internal thread 22 of the tubular sleeve 54. Accordingly, the pressing surface 34 of the upper L-shaped pressing body 38 presses against the outer peripheral surface 50 of the outer tube X2, and the pressing surface 34 of the lower L-shaped pressing body 38 presses against the outer peripheral surface 58 of the inner tube X1. In the same manner as in the first embodiment, the inner and outer tubes X1 and X2 can be fixedly held. Furthermore, unlike the first embodiment, the two L-shaped pressing bodies 38 can move and adjust independently within their respective through slits. However, since removing the fastening threaded part 48 would cause it to fall off, each L-shaped pressing body 38 is provided with an external threaded part 70 and a corresponding through hole.

[0062] The third embodiment of the present invention will now be described. In the following description, structural elements identical to those in the first embodiment will be labeled with the same reference numerals, and their descriptions will be omitted. The following description will refer to... Figures 10-12 The features of this embodiment will be described in detail below. The third embodiment of the present invention is a support for an integral inner and outer tube structure 10. At the fitting portion of the inner tube X1 and the outer tube X2, an L-shaped pressing body 38 and a fastening thread 48 are used for vertical fixation. By tightening the fastening thread 48, the pressing surface 34 of the L-shaped pressing body 38 presses against the outer peripheral surface 58 of the inner tube X1. This is the same as the first embodiment. However, the third embodiment is characterized in that the object supported by the support in the first embodiment is a lightweight music stand, while in this embodiment it is a microphone M. In contrast, in the first embodiment, in the integrated inner and outer tube structure 10, the music stand is supported on the upper end of the inner tube X1, and after adjusting the length of the fitting part of the inner and outer tubes X1 and X2, the inner and outer tubes X1 and X2 are firmly fixed and held by the L-shaped pressing body 38, thereby adjusting the height of the music stand. In contrast, in this embodiment, instead of fixing and holding the inner and outer tubes X1 and X2, the L-shaped pressing body 38 is used to fix and hold the tubular sleeve 54, which is obliquely fixed at the upper end of the inner tube X1, and the rod-shaped cantilever B, which supports the microphone M at the end. More specifically, such as Figures 10-12 As shown, in order to adjust the height or position of the microphone M, after adjusting the embedded position of the cantilever B relative to the tubular sleeve 54, the threaded portion 48 is tightened by screwing the process hole 28 of the load-bearing member 30 of the L-shaped pressing body 38 into the two through holes 18 of the tubular sleeve 54 with internal threads 22. Accordingly, the pressing surface 34 of the pressing member 36 of the L-shaped pressing body 38 is pressed onto the outer peripheral surface of the cantilever B through the first through hole 16, thereby fixing the cantilever B to the tubular sleeve 54. As a variation, for the existing tubular sleeve 54, especially by using a longer L-shaped pressing body 38 of the load-bearing member 30, it is not necessary to provide a first through hole 16 on the tubular sleeve 54. The load-bearing member 30 extends from the end of the tubular sleeve 54, and the pressing surface 34 of the pressing member 36 is directly pressed onto the outer peripheral surface of the cantilever B.

[0063] More specifically, L-shaped pressing bodies 38 and fastening threaded portions 48 are provided near each end face of the tubular sleeve 54. The load-bearing component 30 of each L-shaped pressing body 38 protrudes from the end face of the corresponding tubular sleeve 54. The pressing component 36 is on the inner tube X1 or outer tube X2 side of the end face of the tubular sleeve 54, facing the outer peripheral surface 50 of the inner tube X1 or outer tube X2. Accordingly, unlike the first embodiment, the first through hole 16 through which the pressing component 36 passes can be omitted in the tubular sleeve 54. The length of the load-bearing component 30 of each L-shaped pressing body 38 is set such that the corresponding pressing component 36 protrudes from the corresponding end face of the tubular sleeve 54. Furthermore, based on the viewpoint of convenience in rotating the tubular sleeve 54 to the desired rotation position with the outer tube X2 as the center, a pair of L-shaped pressing bodies 38 and a pair of fastening threads 48 can be provided on the same side of the tubular sleeve 54. As a variation, when the microphone M supported by the cantilever B is lightweight, the L-shaped pressing bodies 38 and fastening threads 48 can also be provided only near one end face of the tubular sleeve 54. In addition, similar to the first embodiment, an L-shaped pressing body 38 and a fastening threaded part 48 may also be used at the fitting part of the inner and outer tubes X1 and X2.

[0064] In summary, when the total length of the inner tube X1 is too short to raise the microphone M to the desired level, the length of the tubular sleeve 54 provided at the fitting part of the inner and outer tubes X1 and X2 is set to be longer. L-shaped pressing bodies 38 and fastening threaded parts 48 are provided near each end of the tubular sleeve 54 (excluding the first through hole 16). Accordingly, similar to the first embodiment, before fastening each fastening threaded part 48, the tubular sleeve 54 is rotated to the desired rotation position with the length direction of the outer tube X2 as the center, and each fastening threaded part 48 is fastened. Accordingly, the rotation of the tubular sleeve 54 with the length direction of the inner and outer tubes X1 and X2 as the center can be fixed, and the inner and outer tubes X1 and X2 can be fixed and held by a pair of L-shaped pressing bodies 38.

[0065] On the other hand, when the length of the tubular sleeve 54 is short, the L-shaped pressing body 38 and the fastening thread 48 may be provided in the same manner only at one end of the tubular sleeve 54, or the U-shaped pressing body 38 may be provided across the tubular sleeve 54.

[0066] Furthermore, for each L-shaped pressing body 38 of the tubular sleeve 54, a fastening thread 48 can be set independently, with one being set as a fastening thread 48 and the other as a pressing rod 100 (seventh embodiment).

[0067] The fourth embodiment of the present invention will now be described. In the following description, structural elements that are the same as those in the first embodiment will be labeled with the same reference numerals, and their descriptions will be omitted. The following description will refer to... Figure 13 The features of this embodiment will be described in detail below. In the fourth embodiment of the present invention, as a support for the integral inner and outer tube structure 10, an L-shaped pressing body 38 and a fastening thread 48 are used to fix and hold the inner tube X1 and the outer tube X2 in the vertical direction. By fastening the fastening thread 48, the pressing surface 34 of the L-shaped pressing body 38 presses the outer peripheral surface 58 of the inner tube X1. This is the same as the first embodiment. However, the fourth embodiment of the present invention is characterized in that the pressing body 38 is used as a filler for the second through hole 18. More specifically, such as Figure 13 As shown, a through hole 18 is provided on the outer peripheral surface near one end of the fitting part of the outer tube X2. An internal thread 22 is formed on the inner peripheral surface of the through hole 18. The pressing body 38 has a shape that can be inserted into the through hole 18. A load-bearing surface 26 is formed on one end face, and a pressing surface 34 is formed on the other end face relative to the outer peripheral surface 58 of the inner tube X1. The pressing body 38 has a length shorter than the depth of the through hole 18. By screwing in the fastening thread 48, the top surface of the external thread 40 rotates around the length direction of the external thread 40. The load-bearing surface 26 bears the pressing load without rotating. At the same time, the pressing body 38 presses the pressing surface 34 against the outer peripheral surface 58 of the inner tube X1 in a tight manner through the through hole 18. The pressing body 38 is a flexible pressing body that can be inserted into the second through hole 18. It has the hardness to allow the pressing surface 34 to deform along the shape of the outer peripheral surface 58 of the inner tube X1 by screwing in the fastening thread 48. For example, it is made of tin.

[0068] According to the integrated inner and outer tube structure 10 with the above structure, when the inner and outer tubes X1 and X2 are fitted together to form an integrated structure, the degree of fixation of the fitting part becomes a consideration depending on the application, such as a music stand bracket, a microphone M bracket, or a medical bracket, such as an infusion bracket or a monitor bracket. However, a through hole 18 is provided on the outer peripheral surface near one end of the fitting part of the outer tube X2. The inner peripheral surface of the through hole 18 forms an internal thread 22. Using the pressing body 38 and the fastening thread 48, by screwing the fastening thread 48 in, the top surface of the external thread 40 rotates around the length direction of the external thread 40. The load-bearing surface 26 bears the pressing load without rotating with it. At the same time, the pressing body 38, through the through hole 18, causes the pressing surface 34 to... The inner tube X1 is pressed against the outer peripheral surface 58 of the inner tube X1. Accordingly, in order to fix and retain the inner and outer tubes X1 and X2 with the required fixing and retaining force according to the purpose, the threaded part 48 is tightened by manpower, so that the inner and outer tubes X1 and X2 can be easily and fully fixed and retained. The pressing body 38 has a shape that can be inserted into the through hole 18. A load-bearing surface 26 is formed on one end face, and a pressing surface 34 relative to the outer peripheral surface 58 of the inner tube X1 is formed on the other end face. It has a length shorter than the depth of the through hole 18. The threaded part 48 has an external threaded part 40 that can be screwed into the internal threaded part 22 and a head 44 provided at one end 42 of the external threaded part 40. A pressing surface 46 that can abut against the load-bearing surface 26 is formed on the side of the external threaded part 40 of the head 44.

[0069] In summary, in the existing bracket of the integrated inner and outer tube structure 10, when the threaded part is laterally screwed into the inner threaded hole of the same outer tube X2 and fixed to the outer peripheral surface 58 of the inner tube X1 at the top of the threaded part, it is difficult for the top of the threaded part to make close contact with the outer peripheral surface 58 of the inner tube X1 through the rotation of the threaded part. Over time, problems such as the music stand slipping may occur. However, by using the pressing body 38 as a filler relative to the second through hole 18 instead of the L-shaped pressing body 38, the second through hole 18 can be utilized. Therefore, compared with the first embodiment, the first through hole 16 is not required. When using the tubular sleeve 54 for operation, it is more advantageous to use a soft and lightweight resin.

[0070] The fifth embodiment of the present invention will now be described. In the following description, structural elements identical to those in the first embodiment will be labeled with the same reference numerals, and their descriptions will be omitted. The following description will refer to... Figure 14 and Figure 15 The features of this embodiment will be described in detail below. The fifth embodiment of the present invention is a support for an integral inner and outer tube structure 10. In order to fix and hold the inner tube X1 and the outer tube X2 in the vertical direction, an L-shaped pressing body 38 and a fastening thread 48 are used. By fastening the fastening thread 48, the pressing surface 34 of the L-shaped pressing body 38 presses the outer peripheral surface 58 of the inner tube X1. This is the same as the first embodiment. However, the fifth embodiment of the present invention is characterized by the manner of the L-shaped pressing body 38. In the first embodiment, the load-bearing member 30 of the L-shaped pressing body 38 is orthogonal to the pressing member 36, and the process hole 28 through which the external thread 40 of the fastening thread 48 passes is provided in the center of the load-bearing member 30. In this embodiment, the load-bearing member 30 of the L-shaped pressing body 38 is connected to the pressing member 36 at an obtuse angle, and the process hole through which the external thread 40 of the fastening thread 48 passes is provided at the end of the load-bearing member 30 near the end opposite to the end of the pressing member 36. More specifically, such as Figure 14 and Figure 15 As shown, the first through hole 16 and the second through hole 18 are parallel to each other and are inclined at a predetermined angle relative to the extending direction of the inner and outer tubes X1, X2 or the tubular sleeve 54. The inclination angle is, for example, less than 10°, thereby enhancing the wedge effect generated by the tightening of the fastening thread 48, so that even if the tightening force of the fastening thread 48 is the same, the inner and outer tubes X1, X2 can be more firmly fixed and held. In this case, the degree of obtuseness of the intersection angle between the load-bearing member 30 and the pressing member 36 of the L-shaped pressing body 38, and the degree to which the process hole 28 through which the external thread 40 of the fastening thread 48 is located on the load-bearing member 30 is positioned close to the end opposite to the side end of the pressing member 36, can be determined based on the degree to which the wedge effect and / or lever principle is enhanced. Depending on the situation, the load-bearing member 30 and the pressing member 36 of the L-shaped pressing body 38 may be connected only at an obtuse angle, or the process hole 28 through which the external thread 40 of the fastening thread 48 is located only on the end of the load-bearing member 30 close to the side end opposite to the side end of the pressing member 36. In addition, such as Figure 14 As shown, the pressing surface 34 of the pressing member 36 is the same as that in the first embodiment. By fastening the threaded portion 48, before the load-bearing member 30 of the L-shaped pressing body 38 begins to tilt toward the end 33 on the opposite side of the end 32 on the pressing member 36 toward the outer surface 56 of the tubular sleeve 54, the pressing surface 34 of the pressing member 36 is formed on the curved surface along the outer peripheral surface 58 of the inner tube X1. As a variation, the first through hole 16 and the second through hole 18 may be arranged in a state where they are parallel to each other and inclined at a predetermined angle relative to the extension direction of the inner and outer tubes X1, X2 or the tubular sleeve 54, and the load-bearing component 30 is parallel to the extension direction of the inner and outer tubes X1, X2 or the tubular sleeve 54, forming an obtuse angle between the load-bearing component 30 and the pressing component 36, and the process hole 28 is provided on the load-bearing component 30 near the pressing component 36. As a further variation, the first through hole 16 may be inclined at a predetermined angle relative to the extending direction of the inner and outer tubes X1, X2 or the tubular sleeve 54, while the second through hole 18 may be set to be orthogonal to the outer peripheral surface 56 of the tubular sleeve 54. The overall planar shape of the pressing surface 34 can be deformed in the same way as in the first embodiment, and can be U-shaped, V-shaped, horizontally elongated, or vertically elongated.

[0071] The sixth embodiment of the present invention will now be described. In the following description, the same reference numerals are used for the same constituent elements as in the first embodiment, and their descriptions are omitted. The descriptions will be based on the following reference numerals. Figure 16 and Figure 17 The features of this embodiment will be described in detail below. The sixth embodiment of the present invention is a support for an integral inner and outer tube structure 10. In order to fix and hold the inner tube X1 and the outer tube X2 in the vertical direction, an L-shaped pressing body 38 and a fastening thread 48 are used. By fastening the fastening thread 48, the pressing surface 34 of the L-shaped pressing body 38 presses the outer peripheral surface 58 of the inner tube X1. This is the same as the first embodiment. However, the sixth embodiment of the present invention is characterized in that the object supported by the support is a lightweight music stand in the first embodiment, but in this embodiment, it is a slender musical instrument such as a saxophone. Correspondingly, in the first embodiment, the tubular sleeve 54 that fixes the inner and outer tubes X1 and X2 to each other can rotate about the length direction of the tube. In contrast, in this embodiment, based on the viewpoint of preventing the instrument from twisting and based on the viewpoint of preventing relative rotation of the tubes between the inner tube X1 and the outer tube X2 about the length direction, the inner and outer tubes X1 and X2 are set as rectangular cross sections. More specifically, such as Figure 16 and Figure 17 As shown, the instrument support is configured such that after the lengths of the inner and outer tubes X1 and X2 are adjusted and fixed according to the length of the instrument body, there are instrument U-shaped support parts SU1 and SU2 at the top and bottom of the inner and outer tubes X1 and X2 respectively, and the instrument body is clamped in each instrument U-shaped support part SU1 and SU2 for support. The inner and outer tubes X1 and X2 have rectangular cross sections. In the first embodiment, since the inner and outer tubes X1 and X2 have circular cross sections, the outer peripheral surface 58 of the inner tube X1 is pressed and fixed relative to the inner peripheral surface 60 of the outer tube X2. The outer peripheral surface 58 of the inner tube X1 on the opposite side of the pressing and fixing part of the pressing surface 34 is fixed and held to the inner peripheral surface 60 of the outer tube X2 in a line contact manner in the vertical direction. The outer tube X2 is fixed and held by supporting the inner tube X1 at two points. In contrast, in this embodiment, the outer peripheral surface 58 of the inner tube X1 on the opposite side of the pressing and fixing part of the pressing surface 34 is pressed and fixed to the inner peripheral surface 60 of the outer tube X2 in a surface contact manner. Furthermore, unlike the first to fifth embodiments, in this embodiment, instead of supporting the music stand, speaker S, microphone M, etc. along the length direction (up and down direction) of the tube, the slender musical instrument is supported by leaning against the inner and outer tubes X1 and X2 after length adjustment. Therefore, the necessity of using a pair of L-shaped pressing parts 36 as in the second embodiment is reduced, and a single L-shaped pressing part 36 can be used.

[0072] The seventh embodiment of the present invention will now be described. In the following description, structural elements that are the same as those in the first embodiment will be labeled with the same reference numerals, and their descriptions will be omitted. Referring to... Figure 18 The features of this embodiment will be described in detail. The seventh embodiment of the present invention is a support for the integral inner and outer tube structure 10. In order to fix and hold the inner tube X1 and the outer tube X2 in the vertical direction, an L-shaped pressing body 38 is used and the pressing surface 34 of the L-shaped pressing body 38 is pressed against the outer peripheral surface 58 of the inner tube X1. This is the same as the first embodiment. However, the feature of the seventh embodiment of the present invention is that in order to press the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1, a fastening threaded part 48 is used in the first embodiment, but in this embodiment, a pressing rod is used instead of a fastening threaded part 48. More specifically, such as Figure 18As shown, a pressing rod 100 is provided, which has an annular circumferential surface 108. One side of the annular circumferential surface 108 abuts against the load-bearing surface 26, and the other side rotates about a rotation axis 102 parallel to the load-bearing surface 26. The annular circumferential surface 108 is curved. By rotating the pressing rod 100, the pressing body 38 can be moved in the thickness direction within the first through hole 18. The curvature is such that the radius from the rotation axis 102 expands from the first radius and changes to the second radius. By rotating the pressing rod 100 around the rotation axis 102, the pressing body 38 begins pressing the outer peripheral surface 58 of the inner tube X1 at a rotation position corresponding to the middle radius of the first radius and the second radius, and ends pressing the pressing body 38 against the outer peripheral surface 58 of the inner tube X1 at a rotation position corresponding to the second radius, so that the pressing surface 34 contacts the outer peripheral surface 58 of the inner tube X1, and presses and fixes the outer peripheral surface 58 of the inner tube X1 on the side opposite to the surface contact portion of the inner tube X1 to the inner peripheral surface 60 of the outer tube X2. The pressing rod 100 has a pair of rotating parts 109 and a rod part 106 connected to the pair of rotating parts 109. The rotating shaft 102 is supported by process holes 110 provided in the pair of rotating parts 109 which are spaced apart in the length direction of the inner and outer tubes X1 and X2, respectively. The rotating shaft 102 is inserted into the threaded part 112 and screwed into the internal threaded part 16 provided on the outer peripheral surface of the tubular sleeve 54 with the holes 104 and process holes 28 provided in the rotating shaft 102 neatly arranged. Accordingly, the pressing body 38 is pressed against the outer peripheral surface 58 of the inner tube X1 through the second through hole 16 while the annular surface 108 is in contact with the load-bearing surface 26 of the L-shaped pressing body 38 with the rotating shaft 102 as the center, through the rod part 106. Furthermore, by screwing in the fastening thread 48, the load-bearing surface 26 bears the pressing load through the pressing surface 46, while the pressing member 36 penetrates the first through hole 16. Accordingly, when the pressing surface 34 is pressed against the outer peripheral surface 58 of the inner tube X1, a gap is formed between the flat portion 41 on one side of the first through hole 16 of the pressing member 36 and the inner peripheral surface of the first through hole 16. The other end of the load-bearing member 30 is inclined towards the inner and outer tubes X1 and X2, and a wedge effect is generated at the corner of the edge portion 55 of the pressing surface 34 containing one side of the flat portion 41. In order to achieve the above-mentioned wedge effect, the first through hole 16 is set to span across the outer peripheral surface 50 of the outer tube X2 in the length direction of the outer tube X2 passing through the center of the internal thread 22. The shape of the pressing surface 34 is set such that when the first through hole 16 is inserted, the amount of expansion in the circumferential direction of the outer tube X2 and the amount of expansion in the length direction of the outer tube X2 are within a specified range, which is the same as in the first embodiment.

[0073] The eighth embodiment of the present invention will now be described. In the following description, structural elements identical to those in the first embodiment will be labeled with the same reference numerals, and their descriptions will be omitted. The descriptions will be based on the following reference numerals. Figure 19 and Figure 20 The features of this embodiment will be described in detail below. The eighth embodiment of the present invention is a support for an integral inner and outer tube structure 10. In order to fix and hold the inner tube X1 and the outer tube X2 in the vertical direction, an L-shaped pressing body 38 is used and the pressing surface 34 of the L-shaped pressing body 38 is pressed against the outer peripheral surface 58 of the inner tube X1. This is the same as the first embodiment. However, the feature of the eighth embodiment of the present invention is that in order to press the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1, a fastening threaded part 48 is used in the first embodiment, but in this embodiment, a pressing rod is used instead of a fastening threaded part 48. More specifically, such as Figure 19 and Figure 20 As shown, in the first embodiment, the outer peripheral surface 58 of the inner tube X1 is pressed by the pressing surface 34, thereby fixing the inner tube X1 and preventing it from sliding downwards. On the other hand, the tubular sleeve 54 is placed on the annular shoulder 94 of the outer tube X2, as... Figure 3 As shown, since there is a gap between the inner tube X1 and the outer tube X2, the inner tube X1 can be pulled upwards along with the tubular sleeve 54 relative to the outer tube X2. In contrast, in this embodiment, the outer peripheral surface 58 of the inner tube X1 is pressed by the pressing surface 34, and the outer peripheral surface 50 of the outer tube X2 is pressed by the pressing surface 35. As a result, the inner tube X1 cannot be pulled upwards along with the tubular sleeve 54, thereby fixing the inner and outer tubes X1 and X2 in place from above and below.

[0074] More specifically, such as Figure 19 As shown, the U-shaped pressing surface 34 in the first embodiment is provided with a step, and the pressing surface 35, which is lower in height from the load-bearing component 30, is separated from the pressing surface 34. It is configured such that the pressing surface 34 presses the outer peripheral surface 58 of the inner tube X1, and the pressing surface 35 presses the outer peripheral surface 50 of the outer tube X2. The height of the step can be set based on the above viewpoint. Furthermore, by screwing in the fastening thread 48, the load-bearing surface 26 bears the pressing load through the pressing surface 46, while the pressing member 36 penetrates the first through hole 16. Accordingly, when the pressing surface 34 is pressed against the outer peripheral surface 58 of the inner tube X1, a gap is formed between the flat portion 41 on one side of the first through hole 16 of the pressing member 36 and the inner peripheral surface of the first through hole 16. The other end of the load-bearing member 30 is inclined towards the inner and outer tubes X1 and X2, and a wedge effect is generated at the corner of the edge portion 55 of the pressing surface 34 containing one side of the flat portion 41. To generate the above-mentioned wedge effect, the first through hole 16 is set to span across the outer peripheral surface 50 of the outer tube X2 in the length direction of the outer tube X2 through the center of the internal thread 22. The shape of the pressing surface 34 is set such that when the first through hole 16 is inserted, the amount of expansion in the circumferential direction of the outer tube X2 and the amount of expansion in the length direction of the outer tube X2 are both within a specified range, which is the same as in the first embodiment. [Example]

[0075] To confirm the effectiveness of the present invention, the inventors manufactured a prototype and conducted an ultimate load test. More specifically, using the shape of the pressing body 38 as a parameter, the fixing and holding effect of the fitting part of the inner and outer tubes X1 and X2 in the vertical direction was confirmed. The prototype consists of a metal inner tube X1, a metal outer tube X2, a metal tubular sleeve 54, a metal pressing body 38 with an L-shaped side cross section, and a fastening threaded part 48. The metal outer tube X2 is fitted into the inner tube X1. The tubular sleeve 54 is firmly fixed to the end of the outer tube X2 and has an internal threaded part 22 and a first through hole 16. The first through hole 16 is positioned in a predetermined relationship with the internal threaded part 22. The pressing body 38 has a process hole 28, and the fastening threaded part 48 has an external threaded part 40. The external threaded part 40 is screwed into the internal threaded part 22 of the outer tube X2 through the process hole 28 of the pressing body 38. The specific test method is as follows: A specified torque is applied to the fastening thread 48 using a hammer wrench. Thus, with the pressing surface 34 of the pressing body 38 pressing against the outer peripheral surface 58 of the inner tube X1, the lower end of the outer tube X2 is placed on a horizontal test table. Thus, the integral structure of the inner and outer tubes X1 and X2 is vertically fixed by the tubular sleeve 54. A compressive load is applied from the upper end of the inner tube X1 along the extension direction of the inner and outer tubes X1 and X2, i.e., the vertical direction. The ultimate compressive load at which the outer tube X2 begins to move relative to the inner tube X1 is measured. For various prototypes, the variation of the ultimate compressive load is controlled using a specified torque as a parameter.

[0076] Test conditions such as Figures 29-33 As shown, the experimental results are as follows: Figures 21-28As shown. In all cases, as the load increases, the specimen undergoes slight compression due to material properties. The inner and outer tubes X1 and X2 of the specimen are held in place until the ultimate load becomes the limit. After this, the load decreases with movement. In this test, the ultimate load at a specified torque is measured. Regarding the test conditions, suggestions were provided for various elements such as the overall planar shape of the pressing surface 34 projected onto the plane, the contact area of ​​the pressing surface 34, its positional relationship with the internal thread, the tightening torque value, the L-shaped pressing body 38, the inner and outer tubes X1 and X2, and the tubular sleeve 54. Figures 29-33 The test number (XYZ) under the test conditions refers to: X represents the overall planar shape of the pressing surface 34; any one of 0 (U-shaped side section), 1 (L-shaped side section and U-shaped), 2 (L-shaped side section and slender), 3 (L-shaped side section and inclined); Y represents the deformation of the overall planar shape of the pressing surface 34; lowercase letters a, b, c... represent a tightening torque of 3 Nm, uppercase letters A, B, C... represent a tightening torque of 5 Nm; Z represents the positional relationship with the internal thread part 22; U (above), L (below). Furthermore, in 3 (L-shaped side section and inclined), the overall planar shape of the pressing surface 34 is the same as that of 1cU and 1cL, and in 3cU and 3dU ( Figure 32 ), 3cL and 3dL ( Figure 33 In the case of the lowercase letter d, the radius of curvature of the pressing surface 34 is set to be slightly smaller than the radius of curvature of the circular outer circumferential surface 58. Accordingly, the entire surface of the pressing surface 34 is not in contact with the outer circumferential surface 58 of the inner tube X1, but only the two circumferential edges of the pressing surface 34 are in contact with the outer circumferential surface 58 of the inner tube X1. There is a gap between the two edges of the pressing surface 34 and the outer circumferential surface 58 of the inner tube X1. On the other hand, in the case of the lowercase letter c, the radius of curvature of the pressing surface 34 is set to be slightly larger than the radius of curvature of the circular outer circumferential surface 58. Accordingly, the entire surface of the pressing surface 34 is not in contact with the outer circumferential surface 58 of the inner tube X1, but only the portion between the two circumferential edges of the pressing surface 34 is in contact with the outer circumferential surface 58 of the inner tube X1. There is a gap between the two edges of the pressing surface 34 and the outer circumferential surface 58 of the inner tube X1.

[0077] The experimental results show the following: 1. According to Figure 21 Confirmation: When the tightening torque is 3 Nm and the pressing body 38 with the U-shaped side section is positioned above the internal thread hole of the tightening thread, the pressing body 38 with the L-shaped side section can firmly fix the inner and outer tubes X1 and X2 compared to the pressing body 38 with the U-shaped side section (0a). By comparing the three groups 1dU and 1cU, 1bU1 and 1aU, and 1fU and 1eU, the longer the strip of the U-shaped planar shape, the greater the ultimate load. By comparing 1dU with 1cU and 1bU with 1aU, the greater the distance from the internal threaded hole of the fastening threaded part, the greater the ultimate load. 2. According to Figure 22 and Figure 23 (exist Figure 22 (See detailed diagram for displacement within 0.08 mm) Confirmation: When the tightening torque is 5 Nm and the pressing body 38 with the U-shaped side section is positioned below the internal threaded hole of the tightening thread, the pressing body 38 with the L-shaped side section can firmly fix the inner and outer tubes X1 and X2 compared to the pressing body 38 with the U-shaped side section. By comparing the three groups 1DL and 1CL, 1BL and 1AL, the longer the strip length of the U-shaped planar shape, the greater the ultimate load. By comparing 1DL with 1CL and 1BL with 1AL, the greater the distance to the internal threaded hole of the fastening thread, the greater the ultimate load. 3. According to Figure 24 When the tightening torque is 3 Nm and the L-shaped side section pressing body 38 is arranged above and to the side of the internal thread hole of the tightening thread, by comparing 2dS, 2cS and 2aU, the ultimate load when the L-shaped side section pressing body 38 is arranged to the side of the internal thread hole of the tightening thread is greater than when it is arranged above. By comparing 1dU and 2aU, the overall planar shape is U-shaped and longitudinally elongated when the internal threaded hole of the fastening thread extends along the circumference of the pipe. The ultimate load is greater than when it extends along the length of the pipe through the center of the internal threaded hole of the fastening thread. 4. According to Figure 25 Confirmation: When the tightening torque is 5 Nm and the pressing body 38 with the L-shaped side section is positioned to the side of the internal thread hole of the tightening thread, by comparing 2FS and 2ES, the overall planar shape of the pressing surface 34 with the L-shaped side section is longitudinally elongated, which can more firmly fix the inner and outer tubes X1 and X2 than the U-shaped shape. By comparing 2FS and 1DL, when the overall planar shape of the L-shaped side section pressing body 38 is longitudinal and it is arranged on the side of the internal threaded hole of the fastening threaded part, the ultimate load is almost the same as when the overall planar shape of the L-shaped side section pressing body 38 is U-shaped and it is arranged below the internal threaded hole of the fastening threaded part, and there is no difference in the effect of firmly fixing the inner and outer tubes X1 and X2. 5. According to Figure 26When the tightening torque is 3 Nm and the pressing body 38 with a U-shaped side section is positioned above the internal threaded hole of the tightening thread, and the pressing body 38 with an L-shaped side section is obliquely mounted on the tubular sleeve 54, by comparing 3dU and 3cU, the smaller the pressing surface 34, the greater the ultimate load. By comparing 3eU and 3bU, the ultimate load is greater when only the process hole is inclined and the internal threaded hole is orthogonal to the extension direction of the tubular sleeve 54 (the load-bearing component is parallel to the tubular sleeve 54). 6. According to Figure 27 When the tightening torque is 3 Nm and the L-shaped side section pressing body 38 is obliquely mounted on the tubular sleeve 54, by comparing 3aL and 3bL, when the L-shaped side section pressing body 38 is positioned below the internal threaded hole of the tightening thread, the larger the tilt angle (the internal threaded hole is parallel to the process hole), the greater the ultimate load. By comparing 3cL and 3dL, the smaller the pressing surface 34, the greater the ultimate load. By comparing 3bL and 3hL, when only the process hole is tilted and the internal threaded hole is orthogonal to the extension direction of the tubular sleeve 54 (the load-bearing component is parallel to the tubular sleeve 54), the ultimate load is even greater. 7. According to Figure 28 When the tightening torque is 3, 2, or 1.6 Nm and the L-shaped side section pressing body 38 is obliquely mounted on the tubular sleeve 54, by comparing 3h'L, 3h'L and 3bL, 3bL, the ultimate load is greater when the L-shaped side section pressing body 38 is positioned below the internal threaded hole of the tightening thread portion than when it is positioned above. In the comparison of 3h'L (2 Nm), 3h”L (1.6 Nm), and 3bL (3 Nm), the order of ultimate load is 3h”L > 3h'L > 3bL. Therefore, it can be seen that a larger tightening torque does not necessarily lead to a larger ultimate load.

[0078] In summary, firstly, it was confirmed that the relative positional relationship between the pressing body 38 and the internal thread portion 22 (through hole) based on the L-shaped side section will result in differences in pressing and fixing capabilities due to the different wedge effect and lever principle. Second, it was confirmed that in the pressing body 38 with the L-shaped side section, the internal thread portion 22 (through hole) and the through hole have different pressing and fixing capabilities when they are parallel to the thickness direction of the tubular sleeve 54 and when they are inclined to the thickness direction of the tubular sleeve 54. Third, it was confirmed that the pressing and fixing capabilities of the pressing body 38 in the L-shaped side section differ depending on the proportion of the tube arranged along the length direction of the tube passing through the center of the internal thread portion 22 (through hole). Fourth, it was confirmed that there is an optimal overall planar shape due to the balance between the wedge effect and the lever principle in the pressing force on the outer peripheral surface 58 of the inner tube X1. When the wedge effect is strong, damage and dents can be reduced on the outer peripheral surface 58 of the soft material inner tube X1. In general, the following findings were confirmed: Compared to the U-shaped side section pressing body 38, the L-shaped side section pressing body 38 can increase the ultimate load by more than 2 times. The fixation of the inner tube X1 and outer tube X2 in the length direction depends on the friction between the inner and outer tubes X1 and X2. In the case of metal inner and outer tubes X1 and X2 supports, the degree of fixation of the inner tube X1 and outer tube X2 in the length direction will vary depending on the roundness and other machining errors of the circular cross-section inner and outer tubes X1 and X2, as well as the surface machining errors such as surface smoothness. However, compared to the U-shaped side section pressing body 38, the L-shaped side section pressing body 38 can absorb this variation in the degree of fixation. In addition, the greater the tightening force of the fastening thread 48, the ultimate load does not necessarily increase monotonically. The ultimate load varies depending on the magnitude of the tightening force of the fastening thread 48.

[0079] The embodiments of the present invention have been described in detail above, but those skilled in the art can make various modifications or alterations without departing from the scope of the present invention. For example, in the first to seventh embodiments, although finished products such as music stands, microphones M, speakers S, and musical instrument stands were described as examples, the invention is not limited thereto. As long as it is necessary to securely fix the inner and outer tubes X1 and X2 in the vertical direction at the fitting part, in existing music stands, for example, a tubular sleeve 54 with an internal thread 22 provided on its inner circumferential surface can be fastened along the length direction of the tube to fix the fitting part of the inner and outer tubes X1 and X2. In this case, the internal thread 22 can be screwed into the external thread 40 provided on the outer circumferential surface of the end of the outer tube X2. In this case, such a tubular sleeve 54 can simply be replaced with the tubular sleeve 54 of this embodiment. In this case, an internal thread 22 can be provided on the inner circumferential surface so that the tubular sleeve 54 can rotate along the length of the tube. Alternatively, as in the first embodiment, an annular shoulder 94 can be provided on the inner circumferential surface and placed on the annular end face EN of the outer tube X2 so that the tubular sleeve 54 can rotate along the length of the tube. For example, in the first to seventh embodiments, although examples of music stands, microphones M, speakers S, and musical instrument stands were described, the invention is not limited to these. As long as it is necessary to firmly fix and hold the inner and outer tubes X1 and X2 in the vertical direction at the fitting part, it is also applicable to medical stands such as infusion stands, infusion stands, and monitor stands that support infusion, monitors, and lighting through the end of the inner tube X1 or outer tube X2 opposite to the fitting part of the inner and outer tubes X1 and X2. For example, in the first embodiment, based on the viewpoint of protecting the outer surface 58 of the inner tube X1, the top end of the external thread portion 40 of the fastening thread portion 48 does not penetrate the internal thread portion 22 of the outer tube X2 or the tubular sleeve 54 but abuts against the outer surface 58 of the inner tube X1. However, it is not limited to this. When the inner and outer tubes X1 and X2 are made of metal, in addition to the pressing surface 34 of the pressing body 38, the top end of the external thread portion 40 of the fastening thread portion 48 abuts against the outer surface 58 of the inner tube X1, which can further firmly fix the position of the inner tube X1 relative to the outer tube X2. The inner and outer tubes X1 and X2 are vertically oriented and the weight can be effectively supported at a specified height through either the inner or outer tube X1 or X2.

[0080] For example, in the first embodiment, the fastening threaded portion 48 has an external threaded portion 40 and a head 44 that is held by fingers and rotated. In contrast, an internal threaded portion 22 is provided on the outer peripheral surface 50 of the outer tube X2. However, it is not limited to this. It is also possible that an external threaded portion 40 is provided on the outer peripheral surface 50 of the outer tube X2, and the fastening threaded portion 48 is a nut-shaped part that engages with the external threaded portion 40. For example, in the first to seventh embodiments, it is described that by passing a single pressing body 38 through the first through hole 16, the outer peripheral surface 58 of the inner tube X1, opposite to the surface contact portion of the pressing surface 34 and the inner tube X1, is pressed and fixed to the inner peripheral surface 57 of the outer tube X2 or the tubular sleeve 54. More specifically, the inner tube X1 and the outer tube X2 are both cylindrical. The pressing and fixing of the outer peripheral surface 58 of the inner tube X1 relative to the inner peripheral surface 60 of the outer tube X2 is such that the outer peripheral surface 58 of the inner tube X1, opposite to the pressing and fixing portion of the pressing surface 34, is pressed and fixed to the inner peripheral surface 60 of the outer tube X2 in a vertically aligned manner. The outer tube X2 is fixed and held by supporting the inner tube X1 at two locations, but this is not limited to this. For example, a pair of pressing bodies 38 may be arranged opposite to each other in the diametrical direction of the outer tube X2.

[0081] For example, in the fifth embodiment, when the inner and outer tubes X1 and X2 are fixedly held by the tubular sleeve 54, from the perspective of facilitating the tightening of the threaded portion 48, in order to independently rotate the tubular sleeve 54 to the desired position and tighten the threaded portion 48 at that position, the annular shoulder 94 provided on the inner circumferential surface of the tubular sleeve 54 is placed on the annular end face EN of the outer tube X2. However, it is not limited to this. If the outer circumferential surface near the upper end of the outer tube X2 originally has an external threaded portion 40, an internal threaded portion 22 that engages with the external threaded portion 40 can be provided on the inner circumferential surface of the tubular sleeve 54 instead of the annular shoulder 94. The tubular sleeve 54 can be rotated to the desired position by screwing in this internal threaded portion 22. For example, in the fifth embodiment, when the inner and outer tubes X1 and X2 are fixedly held using the tubular sleeve 54, from the perspective of facilitating the tightening of the threaded portion 48, in order to independently rotate the tubular sleeve 54 to the desired position and tighten the threaded portion 48 at that position, the annular shoulder 94 provided on the inner circumferential surface 92 of the tubular sleeve 54 is placed on the annular end face EN of the outer tube X2. However, it is not limited to this; it is also possible that the shoulder 94 is placed on the outer circumferential surface that was originally near the upper end of the outer tube X2. The existing bracket of the inner and outer tube integrated structure 10, which is provided with an outer tube X2 and has an inner thread 22 that can be screwed into the outer tube X2 by the tubular sleeve 54 provided with an external thread 40 and an inner thread 22 that can be screwed into the outer thread 40, is replaced with a new tubular sleeve 54 provided with an annular shoulder 94 on the inner circumferential surface. The annular shoulder 94 is placed on the annular end face EN of the outer tube X2. Accordingly, the tubular sleeve 54 is rotated to the desired position.

[0082] For example, in the first to fifth embodiments, it is described that a single L-shaped pressing body 38 is used (first embodiment), a pair of L-shaped pressing bodies 38 are used in combination (second embodiment), an L-shaped pressing body 38 inclined to the inclined first through hole 16 is used (fifth embodiment), and a cylindrical pressing body 38 with an inserted internal thread portion 22 is used (fourth embodiment). However, it is not limited to these methods. These methods can be used in combination. That is, when a pair of L-shaped pressing bodies 38 are used in combination, an L-shaped pressing body 38 inclined to the inclined first through hole 16 and a cylindrical pressing body 38 with an inserted internal thread portion 22 can also be used. This is effective in the case of stably supporting the weight as a height-adjustable support. For example, in the first to fifth embodiments, the overall planar shape of the pressing surface 34 of the L-shaped pressing body 38 is U-shaped, V-shaped, L-shaped, longitudinal, or transverse, and the width of the strip is consistent. However, it is not limited to this. As long as the pressing component 36 of the L-shaped pressing body 38 penetrates the first through hole 16 and the pressing surface 34 can abut against the outer peripheral surface 58 of the inner tube X1, the width of the strip can also vary regularly or irregularly. For example, in the first embodiment, when the overall planar shape of the pressing surface 34 of the L-shaped pressing body 38 is U-shaped, it is configured to be axially symmetrical along the length direction of the tube passing through the center of the internal thread portion 22. However, it is not limited to this. It may also be configured to be axially asymmetrical along the length direction of the tube passing through the center of the internal thread portion 22, for example, with one side shorter and the other side longer.

[0083] For example, in the first embodiment, both the inner and outer tubes X1 and X2 have circular, uniform cross-sections. With the tubular sleeve 54 placed on the annular end face EN of the outer tube X2, the tubular sleeve 54 is rotated about the length of the tube to a desired angular position. The rotation of the tubular sleeve 54 is fixed by the fastening thread 48 via the L-shaped pressing body 38, simultaneously fixing the inner and outer tubes X1 and X2 together. However, this is not a limitation; for example, the inner tube X1 may have a circular, uniform cross-section, and the outer tube X2 may have a flexible cross-section. When the inner tube X1 has a rectangular or square cross-section, the tubular sleeve 54 can be held with one hand and not placed on the annular end face EN of the outer tube X2. Instead, it is suspended above the inner tube X1 with a circular cross-section. The tubular sleeve 54, which is concentric with the inner tube X1, is rotated to the desired angle position with the length of the tube as the center. The rotation of the tubular sleeve 54 is fixed at this height or on the annular end face EN of the outer tube X2 by the fastening thread 48, while the inner and outer tubes X1 and X2 are fixed and held. Attached Figure Description

[0084] Figure 1 This is an overall perspective view of the integrated inner and outer tube structure 10 according to the first embodiment of the present invention. Figure 2 This is a partial exploded view of the integrated inner and outer tube structure 10 according to the first embodiment of the present invention. Figure 3 This is a partial side sectional view of the integral inner and outer tube structure 10 according to the first embodiment of the present invention, along a line passing through the center of the internal thread portion and along the length direction of the tubular sleeve. Figure 4 This is a perspective view of the tubular sleeve of the integrated inner and outer tube structure 10 according to the first embodiment of the present invention. Figure 5 This is a perspective view of the pressing body of the integrated inner and outer tube structure 10 according to the first embodiment of the present invention. Figure 6 This is a perspective view of the fastening thread portion of the integrated inner and outer tube structure 10 according to the first embodiment of the present invention. Figure 7 This is a conceptual diagram illustrating the working principle of the integrated inner and outer tube structure 10 according to the first embodiment of the present invention. Figure 8 This is an overall perspective view of the integrated inner and outer tube structure 10 according to the second embodiment of the present invention. Figure 9 This is a partial side sectional view of the integral inner and outer tube structure 10 according to the second embodiment of the present invention, along a line passing through the center of the internal thread portion and along the length direction of the tubular sleeve. Figure 3 Same diagram. Figure 10This is an overall perspective view of the integrated inner and outer tube structure 10 according to the third embodiment of the present invention. Figure 11 This is a partial side sectional view of the integral inner and outer tube structure 10 according to the third embodiment of the present invention, along a line passing through the center of the internal thread portion and along the length direction of the tubular sleeve. Figure 3 Same diagram. Figure 12 This is a partial exploded view of the integrated inner and outer tube structure 10 according to the third embodiment of the present invention. Figure 13 This is a partial side sectional view of the integral inner and outer tube structure 10 according to the fourth embodiment of the present invention, along a line passing through the center of the internal thread portion and along the length direction of the tubular sleeve. Figure 3 Same diagram. Figure 14 This is a partial side sectional view of the integral inner and outer tube structure 10 according to the fifth embodiment of the present invention, along a line passing through the center of the internal thread portion and along the length direction of the tubular sleeve. Figure 3 Same diagram. Figure 15 This is a perspective view of the pressing body of the integrated inner and outer tube structure 10 according to the fifth embodiment of the present invention. Figure 16 This is an overall perspective view of the integrated inner and outer tube structure 10 according to the sixth embodiment of the present invention. Figure 17 This is a partial side sectional view of the integral inner and outer tube structure 10 according to the sixth embodiment of the present invention, along a line passing through the center of the internal thread portion and along the length direction of the tubular sleeve. Figure 3 Same diagram. Figure 18 This is a partial exploded view of the integrated inner and outer tube structure 10 according to the seventh embodiment of the present invention. Figure 19 This is a perspective view of the pressing body of the integral inner and outer tube structure 10 according to the eighth embodiment of the present invention. Figure 20 This is a partial side sectional view of the integral inner and outer tube structure 10 according to the eighth embodiment of the present invention, along a line passing through the center of the internal thread portion and along the length direction of the tubular sleeve. Figure 3 Same diagram. Figure 21 It is a graph that shows the results of the ultimate support load determination test by using the vertical axis to represent the support load and the horizontal axis to represent the displacement. Figure 22 It is a graph that shows the results of the ultimate support load determination test by using the vertical axis to represent the support load and the horizontal axis to represent the displacement. Figure 23It is a graph that shows the results of the ultimate support load determination test by using the vertical axis to represent the support load and the horizontal axis to represent the displacement. Figure 24 It is a graph that shows the results of the ultimate support load determination test by using the vertical axis to represent the support load and the horizontal axis to represent the displacement. Figure 25 It is a graph that shows the results of the ultimate support load determination test by using the vertical axis to represent the support load and the horizontal axis to represent the displacement. Figure 26 It is a graph that shows the results of the ultimate support load determination test by using the vertical axis to represent the support load and the horizontal axis to represent the displacement. Figure 27 It is a graph that shows the results of the ultimate support load determination test by using the vertical axis to represent the support load and the horizontal axis to represent the displacement. Figure 28 It is a graph that shows the results of the ultimate support load determination test by using the vertical axis to represent the support load and the horizontal axis to represent the displacement. Figure 29 This is a table showing the test conditions for the ultimate bearing load determination test. Figure 30 This is a table showing the test conditions for the ultimate bearing load determination test. Figure 31 This is a table showing the test conditions for the ultimate bearing load determination test. Figure 32 This is a table showing the test conditions for the ultimate bearing load determination test. Figure 33 This is a table showing the test conditions for the ultimate bearing load determination test. Figure 34 This is a perspective view of the pressing body of an integral inner and outer tube structure according to a variation of the first embodiment of the present invention. Figure 35 This is a perspective view of the pressing body of the integral inner and outer tube structure 10 according to a variation of the first embodiment of the present invention. Explanation of reference numerals in the attached figures

[0085] X1: Inner tube; X2: Outer tube; C: Gap between pressing component and first through hole; C1: Gap between inner tube and outer tube; L1: Length of pressing component; L2: Length of load-bearing component; L3: Length of tubular sleeve in the longitudinal direction; t1: Thickness of pressing component; t2: Thickness of load-bearing component; th: Thickness of tubular sleeve; θMAX: Maximum tilt angle of pressing body; D: Diameter of head; D1: Spacing between fulcrum and point of action; D2: Spacing between fulcrum and point of force; D3: Spacing between first through hole and second through hole; 10: Integral structure of inner and outer tubes; 12: Fitting part; 14: Outer peripheral surface; 16: First through hole; 18: Second through hole; 20: Inner peripheral surface; 22: Internal thread part; 24: Flat part; 26: Load-bearing surface; 28: Process hole; 30: Load-bearing component; 32: Load 33: One end of the load-bearing component; 34: Pressing surface; 36: Pressing component; 38: Pressing body; 40: External threaded portion; 41: Flat portion; 42: One end of the external threaded portion; 44: Head; 46: Pressing surface; 48: Fastening threaded portion; 50: Outer circumferential surface of the outer tube; 52: Hollow portion; 54: Tubular sleeve; 55: Edge portion; 56: Outer circumferential surface of the tubular sleeve; 57 58: Inner circumferential surface of the tubular sleeve; 60: Outer circumferential surface of the inner tube; 62: Circumferential surface of the annular protrusion; 64: Protrusion surface; 66: Insertion hole; 76: One end of the pressing surface; 82: Handle; 84: Annular surface; 86: Head; 88: External thread; 90: Internal thread; 92: Inner circumferential surface of the tubular sleeve; 94: Annular shoulder; 96: Caster; 98: Annular surface; 100: Pressing rod.

Claims

1. A structure consisting of an inner and outer tube, wherein the inner and outer tubes, both extending in a vertical direction, are fitted together, characterized in that, A first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitting part of the outer tube, and an internal thread is provided on the inner peripheral surface of the second through hole. The integrated inner and outer tube structure has an L-shaped side cross-section pressing body and a fastening threaded part, wherein, The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. The fastening threaded portion has an external threaded portion that can be screwed into the internal threaded portion, and a head provided at one end of the external threaded portion, wherein a press-in surface is formed on the external threaded portion side of the head that can abut against the load-bearing surface. The pressing member has a length at least longer than the depth of the first through hole, and the process hole in the load-bearing member is positioned such that the external thread portion can be screwed into the internal thread portion when the pressing member is inserted into the first through hole. By screwing in the fastening thread, the load-bearing surface receives the pressing load via the pressing surface, while the pressing component passes through the first through hole. Thus, when the pressing surface presses against the outer circumferential surface of the inner tube... By forming a gap between the pressing surface of the pressing member and the inner circumferential surface of the first through hole, the other end of the load-bearing member is inclined toward the outer circumferential surface of the inner and outer tubes, and a wedge effect is generated at the corner of the edge portion of the pressing surface that includes the side inclined toward the outer circumferential surface of the inner and outer tubes. To achieve the aforementioned wedge effect, the first through hole is positioned across the outer circumferential surface of the outer tube along the length of the outer tube, passing through the center of the internal thread portion. The shape of the pressing surface is set such that, when the first through hole is inserted, the circumferential extension and the length extension of the outer tube are both within a specified range.

2. A structure consisting of an inner and outer tube, wherein the inner and outer tubes, both extending in the vertical direction, are fitted together, characterized in that... A first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitting part of the outer tube, and an internal thread is provided on the inner peripheral surface of the second through hole. The integrated inner and outer tube structure has an L-shaped side cross-section pressing body and a fastening threaded part, wherein, The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. The fastening threaded portion has an external threaded portion that can be screwed into the internal threaded portion, and a head provided at one end of the external threaded portion, wherein a press-in surface is formed on the external threaded portion side of the head that can abut against the load-bearing surface. The pressing member has a length at least longer than the depth of the first through hole, and the process hole in the load-bearing member is positioned such that the external thread portion can be screwed into the internal thread portion when the pressing member is inserted into the first through hole. By screwing in the fastening thread, the load-bearing surface receives the pressing load via the pressing surface, while the pressing component passes through the first through hole. Thus, when the pressing surface presses against the outer circumferential surface of the inner tube... By forming a gap between the planar portion of one of the load-bearing components on the pressing component and the inner circumferential surface of the first through hole, the other end of the load-bearing component is tilted toward the outer circumferential surface of the inner and outer tubes, and the planar portion of the other end abuts against the inner circumferential edge of the first through hole. Accordingly, the pressing force of the end edge of the planar portion of the pressing surface relative to the outer circumferential surface of the inner tube is increased based on the lever principle. The width between the two ends of the pressing surface and / or the position of the process hole in the load-bearing component are set in such a way as the pressing force is increased.

3. A structure consisting of an inner and outer tube, wherein the inner and outer tubes, both extending in the vertical direction, are fitted together, characterized in that... A first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitting part of the outer tube, and an internal thread is provided on the inner peripheral surface of the second through hole. The integrated inner and outer tube structure has an L-shaped side cross-section pressing body and a fastening threaded part, wherein, The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. The fastening threaded portion has an external threaded portion that can be screwed into the internal threaded portion, and a head provided at one end of the external threaded portion, wherein a press-in surface is formed on the external threaded portion side of the head that can abut against the load-bearing surface. The pressing member has a length at least longer than the depth of the first through hole, and the process hole in the load-bearing member is positioned such that the external thread portion can be screwed into the internal thread portion when the pressing member is inserted into the first through hole. By screwing in the fastening thread, the load-bearing surface receives the pressing load via the pressing surface, while the pressing component passes through the first through hole. Thus, when the pressing surface presses against the outer circumferential surface of the inner tube... By forming a gap between the planar portion of one side of the load-bearing component of the pressing member and the inner circumferential surface of the first through hole, the other end of the load-bearing component is inclined toward the outer circumferential surface of the inner and outer tubes, and the planar portion of the other side abuts against the inner circumferential edge of the first through hole. Accordingly, a wedge effect is generated at the corner of the edge portion of the pressing surface that includes the side inclined toward the outer circumferential surface of the inner and outer tubes. At the same time, the pressing force of the end edge portion of the planar portion of the pressing surface relative to the outer circumferential surface of the inner tube is increased based on the lever principle. In order to achieve the above-mentioned wedge effect and increase the pressing force, the wedge effect is exerted by the size of the inclination angle of the L-shaped pressing body corresponding to the gap between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube, based on the given weight of the supported object. At the same time, the width between the two ends of the pressing surface and / or the position of the process hole in the load-bearing member are set to ensure that the inner and outer tubes are fixedly maintained.

4. The integral inner and outer tube structure according to any one of claims 1 to 3, characterized in that, A tubular sleeve is provided at the end of the outer tube on the side where it fits into the inner tube. The tubular sleeve can be fitted onto the outer circumferential surface of the outer tube and the inner tube can pass through the hollow part inside the tubular sleeve. The first through hole and the second through hole are provided from the outer circumferential surface of the tubular sleeve along the thickness direction.

5. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The pressing body is made to penetrate the first through hole, and the pressing surface (34) is made to contact the outer peripheral surface of the outer tube or the tubular sleeve. At the same time, the outer peripheral surface of the inner tube opposite to the surface contact portion of the inner tube is pressed and fixed to the inner peripheral surface of the outer tube or the tubular sleeve.

6. The integrated inner and outer tube structure according to claim 5, characterized in that, The pressing surface has a hardness that does not deform when the outer circumferential surface of the inner tube is pressed, and the pressing surface is formed along the outer circumferential surface of the inner tube.

7. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The inner and outer tubes are arranged in a vertical direction with the inner tube on top and the outer tube on the bottom, and the interlocking part of the inner and outer tubes is circular in cross-section.

8. The integrated inner and outer tube structure according to claim 7, characterized in that, The inner tube and the outer tube are both cylindrical. The outer circumferential surface of the inner tube is pressed and fixed relative to the inner circumferential surface of the outer tube by pressing and fixing the outer circumferential surface of the inner tube to the inner circumferential surface of the outer tube by means of vertical line contact. The outer tube is fixed and held to the inner tube by supports at two points.

9. The integral inner and outer tube structure according to any one of claims 1 to 3, characterized in that, The load-bearing surface is formed as an annular protruding circumferential surface around the process hole.

10. The integral inner and outer tube structure according to any one of claims 1 to 3, characterized in that, The load-bearing surface is formed as a protruding surface on the end side of the load-bearing component.

11. The integral inner and outer tube structure according to any one of claims 1 to 3, characterized in that, The load-bearing component and the pressing component are arranged orthogonally.

12. The integral inner and outer tube structure according to claim 4, characterized in that, The process hole is provided on the other end of the load-bearing component, and the tubular sleeve is provided with a through hole on its inner circumferential surface with an internal thread. The external thread can be screwed into the through hole through the process hole, and the length of the external thread is set in such a way that the top end of the external thread does not abut against the outer circumferential surface of the inner tube when screwed in.

13. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The overall planar shape of the pressing surface is an inverted U-shape that can penetrate the first through hole and open towards the second through hole, and is disposed around the second through hole.

14. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The overall planar shape of the pressing surface is an inverted V-shape that can penetrate the first through hole and open towards the second through hole, and is disposed around the second through hole.

15. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The overall planar shape of the pressing surface is an L-shape that can penetrate the first through hole, and it is disposed around the second through hole.

16. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The overall planar shape of the pressing surface is a transverse shape that can pass through the first through hole and traverse the length direction of the tube passing through the center of the second through hole.

17. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The pressing component has a consistent cross-section along its length, and its top surface forms the pressing surface.

18. The integral inner and outer tube structure according to claim 13 or 14, characterized in that, The inverted U-shaped and inverted V-shaped pressing surfaces are respectively arranged in an axisymmetric shape with respect to the length direction of the inner and outer tubes passing through the center of the internal thread.

19. The integral inner and outer tube structure according to claim 13 or 18, characterized in that, The inverted U-shaped pressing surface is arranged concentrically with respect to the second through hole.

20. The integral inner and outer tube structure according to claim 1 or 2, characterized in that, The first through hole and the second through hole are parallel to each other and are inclined at a predetermined angle relative to the extension direction of the inner and outer tubes or the tubular sleeve.

21. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The first through hole is inclined at a predetermined angle relative to the extension direction of the inner and outer tubes or the tubular sleeve. On the other hand, the orientation of the second through hole is set to be orthogonal to the outer peripheral surface of the outer tube or the tubular sleeve.

22. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, The fastening threaded portion has a shank and an external threaded portion extending downward from the lower surface of the shank. An annular surface is formed around the external thread portion on the lower surface. By screwing the external thread portion into the internal thread portion through the process hole, the lower surface of the handle portion abuts against the load-bearing surface of the pressing body, thereby making the fastening thread portion and the pressing body an integral unit, pressing and fixing the inner tube, and simultaneously screwing it into and fixing it to the outer tube.

23. The integral inner and outer tube structure according to claim 20, characterized in that, The fastening threaded portion has a head at the end of the shank opposite to the end of the external threaded portion, which can be rotated by pinching with fingers.

24. The integral inner and outer tube structure according to claim 4, characterized in that, The tightening of the threaded portion prevents the tubular sleeve from rotating around the length of the inner and outer tubes, while simultaneously fixing the inner and outer tubes in the specified mating position.

25. The integral inner and outer tube structure according to claim 4, characterized in that, The length of the tubular sleeve and / or the length of the load-bearing component is set by pressing the top end of the external thread of the fastening thread directly against the outer circumferential surface of the outer tube.

26. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, When the fastening thread is tightened, the maximum tilt angle of the other end of the load-bearing component of the pressing body in the direction approaching the outer circumferential surface of the outer tube or the tubular sleeve is set by the thickness of the tubular sleeve, and / or the gap between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube, and / or the gap between the pressing surface and the first through hole.

27. The fixing and retaining fixture according to claim 4, characterized in that, An external thread is provided on the side circumferential surface of one end of the outer tube, and an internal thread that can be screwed into the external thread is provided on the inner circumferential surface of the tubular sleeve.

28. The integral structure of inner and outer tubes according to any one of claims 1 to 4, characterized in that, The load-bearing component and the pressing component are configured to form an obtuse angle, and the process hole is located near the other end of the load-bearing component.

29. The integral inner and outer tube structure according to claim 4, characterized in that, An annular shoulder is formed on the inner circumferential surface of the tubular sleeve. The width of the annular shoulder is such that it can be placed on the annular end face (EN) of the outer tube, allowing the tubular sleeve to rotate about its length.

30. The integral inner and outer tube structure according to any one of claims 1 to 29, characterized in that, The integrated inner and outer tube structure is a musical support, which supports any one of a music stand, musical instrument, loudspeaker, and amplifier through the end of the inner tube or the outer tube opposite to the fitting part of the inner and outer tubes.

31. The integral inner and outer tube structure according to any one of claims 1 to 29, characterized in that, The integrated inner and outer tube structure is a medical stent. It is equipped with casters at the end of the inner tube or the outer tube opposite to the fitting part of the inner and outer tubes, allowing it to move. It supports any one of an infusion device, a monitor, or a light source through the end of the outer tube or the inner tube opposite to the fitting part of the inner and outer tubes.

32. The integral inner and outer tube structure according to claim 22, characterized in that, The diameter of the head and the diameter and / or pitch of the external thread are set by means of fully securing and holding the inner and outer tubes by hand tightening the fastening thread.

33. The integral inner and outer tube structure according to any one of claims 1 to 4, characterized in that, By setting the ratio of the gap between the other flat portion of the pressing component and the center of the process hole to the distance between the other flat portion of the pressing component and the center of the second through hole, the fastening force of the fastening thread is increased based on the lever principle.

34. A structure consisting of an inner and outer tube, wherein the inner and outer tubes, both extending in the vertical direction, are fitted together, characterized in that... A first through hole and a second through hole are provided on the outer peripheral surface near one end of the fitting part of the outer tube along the thickness direction, and an internal thread is provided on the inner peripheral surface of the second through hole. The integrated inner and outer tube structure has an L-shaped side cross-section pressing body. The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. The pressing member has a length at least longer than the depth of the first through hole, and the process hole in the load-bearing member is positioned such that the external thread portion can be screwed into the internal thread portion when the pressing member is inserted into the first through hole. Furthermore, it includes a pressing rod with an annular circumferential surface. One side of the annular circumferential surface abuts against the load-bearing surface, while the other side rotates about an axis parallel to the load-bearing surface. The annular circumferential surface is curved, with its radius expanding from a first radius to a second radius starting from the axis. Rotation of the pressing rod allows the pressing body to move within the first through hole along the thickness direction of the first through hole. The pressing rod is rotated around an axis set at a predetermined height from the outer circumferential surface of the outer tube. At a rotational position corresponding to the midpoint between the first and second radii, the pressing body begins pressing against the outer circumferential surface of the inner tube. At a rotational position corresponding to the second radius, the pressing body ends pressing against the outer circumferential surface of the inner tube, bringing the pressing surface into surface contact with the outer circumferential surface of the inner tube. The outer circumferential surface of the inner tube, opposite to the surface contact portion of the pressing surface relative to the inner tube, is pressed and fixed to the inner circumferential surface of the outer tube. By rotating the pressing rod, the load-bearing surface bears the pressing load via the pressing surface, while the pressing member penetrates the first through hole. Accordingly, when the pressing surface is pressed against the outer circumferential surface of the inner tube, a gap is formed between the planar portion of the pressing member on the first through hole side and the inner circumferential surface of the first through hole. The other end of the load-bearing member is inclined close to the outer circumferential surface of the inner and outer tubes, and a wedge effect is generated relative to the outer circumferential surface of the inner tube at the corner of the edge portion of the pressing surface containing the planar portion of the pressing surface. In order to achieve the above-mentioned wedge effect, the first through hole is set to span the outer circumferential surface of the outer tube in the length direction of the outer tube through the center of the internal thread portion. The shape of the pressing surface is set such that when inserted into the first through hole, the circumferential extension amount and the length extension amount of the outer tube are both within a specified range.

35. A method for fixing and holding inner and outer tubes, characterized in that, It has the following stages: The stage of preparing an L-shaped side cross-section pressing body, a tubular sleeve, and a fastening threaded part, wherein the pressing body has a load-bearing component and a pressing component, the load-bearing component has a load-bearing surface and a process hole, the pressing component extends from one end of the load-bearing component to the side opposite to the load-bearing surface, and has a pressing surface at the top end, the tubular sleeve has a first through hole and a second through hole on its outer peripheral surface, and an internal threaded part is provided on the inner peripheral surface of the second through hole, the fastening threaded part has an external threaded part that can be screwed into the internal threaded part, and forms a press-in surface that can abut against the load-bearing surface; The stage in which a tubular sleeve with a circular cross-section on the inner circumference is embedded in the upper end of the outer tube; The stage of embedding the inner tube into the tubular sleeve or outer tube; The stage of rotating the tubular sleeve to the desired rotation position with the length of the outer tube as the center; By tightening the threaded portion, the pressing surface is pressed from the outside of the tubular sleeve toward the outer circumferential surface of the inner tube in the thickness direction of the tubular sleeve. This fixes the tubular sleeve in the desired rotational position with the outer tube's length direction as the center. Simultaneously, the opposite outer circumferential surface of the inner tube is pressed against the inner circumferential surface of the tubular sleeve or the outer tube, thereby fixing the inner and outer tubes together in the length direction. The fixed holding stage has the following phase: by forming a gap between the planar portion of one side of the second through hole on the pressing member and the inner circumferential surface of the second through hole, the other end of the load-bearing member is inclined in a manner close to the outer circumferential surface of the inner and outer tubes, and a wedge effect relative to the outer circumferential surface of the inner tube is generated at the corner of the pressing surface containing the edge portion near the load-bearing member.

36. The method for fixing and holding the inner and outer tubes according to claim 35, characterized in that, It also has the following stages: by pressing the tubular sleeve from the outside towards the outer circumferential surface of the outer tube in the thickness direction of the tubular sleeve, the tubular sleeve is fixed in the desired rotational position with the length direction of the outer tube as the center, and the outer circumferential surface of the opposite side of the outer tube is pressed against the inner circumferential surface of the tubular sleeve, thereby fixing and holding the inner and outer tubes together in the length direction.

37. The method for fixing and holding the inner and outer tubes according to claim 36, characterized in that, The inner circumferential surface of the tubular sleeve is provided with a reduced diameter section that is larger than the diameter of the inner tube and an expanded diameter section that is larger than the diameter of the outer tube. An annular shoulder is formed at the connection between the reduced diameter section and the expanded diameter section. The annular shoulder is placed on the annular upper end face of the outer tube, so that the tubular sleeve rotates around the length of the outer tube at the desired rotational position.

38. A structure with an integral inner and outer tube, wherein the inner and outer tubes are fitted together, characterized in that... A through hole is provided on the outer circumferential surface near one end of the fitting part of the outer tube along the thickness direction of the outer tube, and an internal thread is formed on the inner circumferential surface of the through hole. The integrated inner and outer tube structure has a pressing body and a fastening threaded part, wherein... The pressing body has a shape that can be inserted into the through hole, and a load-bearing surface is formed on one end face, and a pressing surface is formed on the other end face relative to the outer peripheral surface of the inner tube. The fastening threaded portion has an external threaded portion that can engage with the internal threaded portion and a head provided at one end of the external threaded portion, and a press-in surface is formed on the external threaded portion side of the head that can abut against the load-bearing surface. The pressing body has a length shorter than the depth of the through hole. By screwing in the fastening thread, the top surface of the external thread rotates about the length direction of the external thread. The load-bearing surface bears the pressing load through the pressing surface. At the same time, the pressing body does not rotate with it. Through the through hole, the pressing surface is pressed tightly against the outer circumferential surface of the inner tube.

39. The integral inner and outer tube structure according to claim 38, characterized in that, The pressing body is a flexible pressing body that can be inserted into the second through hole, and it has the hardness to deform the pressing surface along the shape of the outer circumference of the inner tube by screwing it into the fastening thread.

40. A tubular sleeve, wherein the end of the outer tube on the fitting portion side where it fits with the inner tube can be externally fitted onto the outer circumferential surface of the outer tube, and the inner tube can penetrate its internal hollow portion, characterized in that, A first through hole and a second through hole are provided on the outer peripheral surface near one end along the thickness direction, and an internal thread is provided on the inner peripheral surface of the second through hole. It also features an L-shaped side cross-section pressing body and a fastening threaded part, wherein, The pressing body has a load-bearing component and a pressing component. The load-bearing component has opposing planar portions, one of which has a load-bearing surface and a process hole extending through the thickness direction between the opposing planar portions. The pressing component extends from one end of the load-bearing component to the opposite side of the load-bearing surface, has opposing planar portions, and has a pressing surface at its top end. This pressing surface penetrates the first through hole and can press against the outer circumferential surface of the inner tube. The fastening threaded portion has an external threaded portion that can be screwed into the internal threaded portion, and a head provided at one end of the external threaded portion, and a press-in surface that can abut against the load-bearing surface is formed on the external threaded portion side of the head.

41. The tubular sleeve for an integrated internal and external structure according to claim 40, characterized in that, An external thread is provided on the outer circumferential surface of one end of the outer tube, and an internal thread that can be screwed into the external thread is provided on the inner circumferential surface of the tubular sleeve.

Images