Inner and outer pipe integrated structure and method for fixing and holding inner and outer pipes

Abstract

To provide an integrated structure of inner and outer pipes, a method for fixing and holding the inner and outer pipes X1, X2, and a tubular sleeve 54 for the integrated structure, which can easily and sufficiently fix and hold the inner and outer pipes X1, X2 by manually tightening a fastening screw portion 48 to fix and hold the inner and outer pipes X1, X2 with the necessary fixing and holding force depending on the application. [Solution] An integral structure in which inner and outer pipes X1 and X2 extending in the vertical direction are fitted together, A first through hole 16 and a second through hole 18 are provided on the outer peripheral surface of the outer tube X2 near one end on the fitting portion side, and a female thread portion 22 is provided on the inner peripheral surface of the second through hole 18. a load receiving member (30) having opposing flat surfaces (41), one of the flat surfaces (41A) having a load receiving surface (26), and having a clearance hole penetrating in the thickness direction between the opposing flat surfaces (41); a pressing member (36) extending from one end of the load receiving member (30) toward the opposite side of the load receiving surface (26), having the opposing flat surfaces (41), and having a pressing surface (34) at its tip, and having an L-shaped cross section; a male threaded portion (40) that can be threaded into the female threaded portion (22) and a head portion provided at one end of the male threaded portion (40), and a fastening screw portion (48) that has a push-in surface (46) that can come into contact with the load-receiving surface (26) formed on the male threaded portion (40) side of the head portion; the pressing member 36 has a length longer than at least the depth of the first through hole 16, and the clearance hole is provided in the load-receiving member 30 at a position where the male threaded portion 40 can be screwed into the female threaded portion 22 when the load-receiving member 30 is inserted into the first through hole; When the fastening screw portion 48 is screwed in, the load-receiving surface 26 receives a pressing load via the pressing surface 46, and the pressing member 36 penetrates the first through-hole 16, so that the pressing surface 34 presses against the outer peripheral surface 58 of the inner pipe X1. an inner and outer pipe integrated structure, characterized in that the first through hole 16 is arranged on the outer peripheral surface 50 of the outer pipe X2 so as to straddle the longitudinal direction of the outer pipe X2 passing through the center of the female thread portion 22 of the outer pipe X2, so that a clearance is formed between one flat portion 41A on the first through hole 16 side of the pressing member 36 and the inner peripheral surface of the first through hole 16, causing the other end of the load-receiving member 30 to tilt toward the inner and outer pipes X1, X2, and a wedge effect is generated at a corner including an edge portion 55 of one flat portion 41A of the pressing surface 34; and the pressing surface 34 is set to a shape such that, when inserted into the first through hole 16, the expansion of the outer pipe X2 in the circumferential direction and the expansion of the outer pipe X2 in the longitudinal direction of the outer pipe X2 each fall within a predetermined range.

Description

[Technical Field]

[0001] The present invention relates to an integrated inner and outer pipe structure, a method for fixing and holding the inner and outer pipes, and a tubular sleeve for the integrated inner and outer pipe structure, and more particularly to an integrated inner and outer pipe structure, a method for fixing and holding the inner and outer pipes, and a tubular sleeve for the integrated inner and outer pipe structure, which enable the inner and outer pipes to be fixed and held with the required fixing and holding force depending on the application by simply tightening the fastening screw parts with manual force. [Background technology]

[0002] Conventionally, height-adjustable stands that utilize interlocking inner and outer tubes have been used in a wide range of applications, including music stands, medical stands, and holders. Such stands can be broadly divided into two types: one in which the fastening screw portion is screwed into a threaded hole on the outer surface of the outer tube in a direction intersecting the longitudinal direction of the tubes, and the tip of the screw is pressed against the outer surface of the inner tube to fix the fitting portion of the inner and outer tubes; and one in which a male thread portion is provided on the end peripheral surface of the outer tube, and a tubular sleeve with a female thread portion that screws into the male thread portion is provided on the inner peripheral surface, and the fitting portion is tightened by screwing into the tubular sleeve.However, in both types, the inner and outer tubes are not sufficiently fixed, and the applicant of this application has proposed a length adjustment jig for stands that improves this issue, as disclosed in Patent Document 1.

[0003] The length adjustment jig of the present invention is a length adjustment jig interposed between an inner tube and an outer tube that are fitted together, the outer tube having a pair of spaced-apart through slits on its outer surface, a female threaded portion between the pair of through slits, a pressing portion positioned on the outer surface of the outer tube and penetrating the pair of through slits to abut against the outer surface of the inner tube, and a tightening screw portion capable of pressing and fixing the pressing portion against the outer surface of the inner tube, the tightening screw portion having a male threaded portion that can be threaded into the female threaded portion, and after adjusting the fitting position of the inner tube relative to the outer tube, the male threaded portion is threaded into the female threaded portion by the tightening screw portion, while the pressing portion is passed through the pair of through slits to press and fix against the outer surface of the inner tube. Note that a tubular sleeve having a female threaded portion and a through hole within a predetermined range from the female threaded portion on its outer surface may be employed and attached and fixed to the outer surface of one end of the outer tube, and the tubular sleeve may be used to fix and hold the fitted portions of the inner and outer tubes.

[0004] With the length adjustment jig having the above configuration, each outer surface of the outer tube has a female thread portion, at least one through hole within a predetermined range from the female thread portion, at least one pressing portion that passes through the through hole from the outer peripheral surface of the outer tube and abuts against the outer peripheral surface of the inner tube, and a clamping screw portion that can press and fix the pressing portion against the outer peripheral surface of the inner tube.When adjusting the length of the mating portion of the inner and outer tubes that are fitted together, the tip surface of the pressing portion is shaped to fit along the outer peripheral surface of the inner tube so that it can make surface contact with the outer peripheral surface of the inner tube.After adjusting the mating position of the inner tube relative to the outer tube, the clamping screw portion is rotated to thread the male thread portion into the female thread portion on the outer peripheral surface of the outer tube, and then the clamping screw portion is screwed in so that the pressing portion within a predetermined range from the female thread portion passes through the through hole, and the tip surface can be pressed and fixed against the outer peripheral surface of the inner tube in a surface contact manner.This simple structure makes it possible to adjust the overall length of the inner and outer tubes so that it can be fixed and held in place with easy operation without requiring excessive clamping force.

[0005] However, the pressing portion is positioned on the outer peripheral surface of the outer tube, passes through a pair of through slits, and contacts the outer peripheral surface of the inner tube. More specifically, the male thread portion of the tightening screw portion has a clearance hole portion that passes through in the thickness direction, and two pressing legs that extend in opposite directions from the clearance hole portion, forming a pressing body with a substantially U-shaped vertical cross section. This causes the following technical problems. That is, firstly, with such a U-shaped pressing body, when the fastening screw portion is tightened by hand, the inner and outer tubes are not sufficiently fixed to each other, and when used as a stand, music stands, microphones, speakers, etc. supported by a stand having inner and outer tubes extending in the vertical direction may slip down over time.

[0003] More specifically, the pair of pressing surfaces have corresponding two through holes on the outer peripheral surface of the outer tube, but because they press horizontally against the outer peripheral surface of the inner tube simultaneously, no wedge effect is produced by the pressing surfaces, and the clamping force of the U-shaped plate toward the outer peripheral surface of the inner tube does not increase the pressing force by the pressing surfaces due to the principle of leverage. It is possible to increase the clamping force of the fastening threads to a certain extent by increasing the head diameter of the fastening threads and making the male thread pitch finer, but the use of non-standard fastening threads increases costs and the increased clamping force may cause the fastening itself to loosen over time.

[0006] Secondly, if the inner and outer tubes are of the conventional type that are fitted together by screwing, it is advantageous to use the male threaded portion provided on the outer surface of the outer tube. When providing a tubular sleeve to fit onto the male threaded portion, it is preferable to use a resin material from the standpoint of low cost and light weight. However, from the standpoint of ensuring the strength of the tubular sleeve, it is preferable to have a small area and number of through holes provided from the outer surface of the tubular sleeve in the thickness direction. However, if the inner and outer tubes are both made of resin, if the wedge effect of the pressing surface is too strong, scratches or dents may occur on the outer surfaces of the inner and outer tubes.

[0007] Third, the vertical fixing force at the fitting portion between the inner and outer tubes depends on the state of contact between the inner and outer tubes, and the roundness and / or surface smoothness of the inner and outer tubes due to processing have a large effect on the vertical fixing force at the fitting portion between the inner and outer tubes. However, there is more variation in the roundness and / or surface smoothness of the inner and outer tubes due to processing, particularly in the machining of metal inner and outer tubes than in the molding processing of plastic inner and outer tubes, and the inner and outer tubes are likely to be insufficiently fixed in the longitudinal direction of the tubes by screwing in the fastening screw portion.

[0008] In this regard, Patent Document 2 discloses an inner and outer pipe fastening tool for a telescoping pipe, which is a jig for fitting and fastening an inner pipe B and an outer pipe A in a telescoping relationship, and includes a pressing lever 61, a U-shaped pressing tool 4, and a tubular sleeve 1, and is configured so that, when the pressing lever 61 is rotated, a pair of legs of the U-shaped pressing tool 4 pass through a pair of through-holes provided in the outer peripheral surface of the outer pipe A and are pressed against the outer peripheral surface of the inner pipe B. More specifically, a curved support plate 2 is provided inside the tubular sleeve 1, and correspondingly, openings of a shape complementary to the curved support plate 2 are provided on the diametrically opposite side of the pair of through-holes on the outer peripheral surface of the outer pipe A, and the curved support plate 2 is inserted into the openings, and the outer pipe A is pressed against the outer peripheral surface of the inner pipe B via the curved support plate 2 on the diametrically opposite side of the pair of through-holes on the outer peripheral surface of the outer pipe A. Patent Document 3 also discloses a height adjustment device for an extendable sub-pipe, which is a jig that fits and tightens an inner pipe 2 and an outer pipe 1 in a nested relationship, and has a fastening screw portion 11, a U-shaped pressing tool 9, and a tubular sleeve 4.The male thread of the fastening screw portion 11 is threaded through a clearance hole in the U-shaped pressing tool 9 and into the female thread provided in the tubular sleeve 4, so that a pair of legs of the U-shaped pressing tool 9 pass through a pair of through holes 8 provided on the outer surface of the outer pipe 1 and are pressed against the outer surface of the inner pipe 2.

[0009] Furthermore, Patent Document 4 discloses an inner and outer pipe fastening device for a telescopic pipe, which, in relation to Figs. 1 to 3, has an outer pipe A, an inner pipe B, a ring 1 provided with a male thread portion 3, a U-shaped member 4 having a clearance hole, a nut 5 that can be screwed onto the male thread portion 3, and an arc-shaped member 2 that can be placed within the opening of the outer pipe A, and when the nut 5 is tightened, the U-shaped member 4 is pushed toward the outer pipe A, and its leg ends 4, 4 are pressed against the outer surface of the outer pipe A, generating a tension force between the U-shaped member 4 and the screw 3, and the screw 3, ring 1, and arc-shaped member 2 are pulled together toward the U-shaped member 4. It is described that the inner and outer tubes of the telescopic tube are fastened together using a U-shaped member 4, as a result of which the surface of the arc-shaped member 2 comes into contact with the outer surface of the inner tube B, and the inner tube B is pressed and clamped between the arc-shaped member 2 and the inner wall surface of the outer tube facing member 2, thereby being fastened together with the outer tube A. However, it is not disclosed, nor even suggested, that the U-shaped member 4 is pressed and fixed against the outer surface of the inner tube in a surface contact manner toward the outer surface of the inner tube, and that the outer surface of the inner tube on the opposite side of the surface contact part where the pressing part makes contact with the inner tube is directly pressed and fixed against the inner surface of the outer tube. Furthermore, Patent Document 5 discloses a contractible rod structure in which an inner pipe 2 and an outer pipe 3 are fitted together via a sleeve 41 so that the length can be adjusted, and an annular shoulder is formed on the inner surface of the sleeve 41, which is placed on the annular end face EN of the outer pipe 3, and two positioning bolts 4112 and a fixing bolt 4122 are screwed into the through holes of the sleeve 41, so that one positioning bolt 4112 fixes the inner pipe 2, while the fixing bolt 4122 fixes the outer pipe 3. However, in Patent Document 5, the elastic engagement plate 42 is fitted into a groove provided on the inner surface of the sleeve 41, and the positioning bolt 4112 fixes the inner pipe 2 via the elastic engagement plate 42, and the inner pipe 2 is not fixed directly, and the positioning bolt and the fixing bolt are provided separately. Furthermore, Patent Document 5 discloses an annular shoulder on the inside of sleeve 41, which corresponds to a tubular sleeve, but merely discloses that to position sleeve 41 relative to outer pipe 3, the annular end face EN of the outer pipe is abutted against the annular shoulder of sleeve 41.On the other hand, it discloses that the sleeve is fixed to inner pipe 2 with a separate bolt 4122 and then the positioning bolt 4112 is tightened, but it does not disclose or even suggest that the sleeve is rotated axially to a desired circumferential position, i.e., that the annular shoulder of sleeve 41 is placed on the annular end face EN of the outer pipe and the tubular sleeve is rotated about the axial direction to a desired circumferential position. The fixation of the pipes in the extension direction at the fitting portion of the inner and outer pipes depends on the frictional force based on the friction coefficient between the outer peripheral surface of the inner pipe and the inner peripheral surface of the outer pipe, but in the case of metal inner and outer pipes in particular, even if the inner and outer pipes are made of the same material, the frictional force varies depending on machining errors such as roundness and surface smoothness treatment, so that fixation and retention of the pipes in the extension direction may become unstable depending on the inner and outer pipes. In this sense, there is a demand for stable fixation and retention of the inner and outer pipes in the extension direction that is not affected by machining errors of the inner and outer pipes. [Patent Document 1] Patent No. 7369944 [Patent Document 2] Jippan No. 54-69633 [Patent Document 3] Jippan No. 58-89605 [Patent Document 4] Jippan No. 51-71610 [Patent Document 5] U.S. Patent Application Publication No. 2012-0001416 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0010] In view of the above technical problems, an object of the present invention is to provide an integrated structure of inner and outer pipes, a method for fixing and holding the inner and outer pipes, and a tubular sleeve for the integrated structure, which can easily and sufficiently fix and hold the inner and outer pipes by manually tightening the fastening screw portions, so as to fix and hold the inner and outer pipes with the required fixing and holding force depending on the application. [Means for solving the problem]

[0011] In order to achieve the object of the present invention, the integral structure of the inner and outer pipes of the present invention comprises: Both are integral structures in which inner and outer pipes extending in the vertical direction are fitted together, a first through hole and a second through hole are provided on an outer peripheral surface of the outer tube near one end of the fitting portion, and a female thread portion is provided on an inner peripheral surface of the second through hole; a load receiving member having opposing flat surfaces, one of which has a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, having opposing flat surfaces, and having a pressing surface at its tip, the pressing body having an L-shaped side cross section; a fastening screw portion having a male thread portion that can be threaded into the female thread portion and a head portion provided at one end of the male thread portion, the head portion having a push-in surface that can come into contact with the load-receiving surface formed on the male thread portion side; the pressing member has a length longer than at least a depth of the first through hole, and the clearance hole is provided in the load-receiving member at a position where the male thread portion can be screwed into the female thread portion when the pressing member is inserted into the first through hole, When the fastening screw portion is screwed in, the load-receiving surface receives a pressing load via the pressing surface, and the pressing member penetrates the first through hole, causing the pressing surface to press against the outer peripheral surface of the inner tube, The first through hole is arranged on the outer surface of the outer tube so as to straddle the longitudinal direction of the outer tube passing through the center of the female thread portion of the outer tube, so that a clearance is formed between the pressing surface of the pressing member and the inner surface of the first through hole, causing the other end side of the load-receiving member to incline toward the outer peripheral surfaces of the inner and outer tubes, and a wedge effect is generated at the corner including the edge portion of the pressing surface on the side inclined toward the outer peripheral surfaces of the inner and outer tubes, and the pressing surface is configured to have a shape such that when inserted into the first through hole, the circumferential expansion of the outer tube and the longitudinal expansion of the outer tube each fall within a predetermined range.

[0012] In order to achieve the object of the present invention, the integral structure of the inner and outer pipes of the present invention comprises: Both are integral structures in which inner and outer pipes extending in the vertical direction are fitted together, a first through hole and a second through hole are provided on an outer peripheral surface of the outer tube near one end of the fitting portion, and a female thread portion is provided on an inner peripheral surface of the second through hole; a load receiving member having opposing flat surfaces, one of which has a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, having opposing flat surfaces, and having a pressing surface at its tip, the pressing body having an L-shaped side cross section; a fastening screw portion having a male thread portion that can be threaded into the female thread portion and a head portion provided at one end of the male thread portion, the head portion having a push-in surface that can come into contact with the load-receiving surface formed on the male thread portion side; the pressing member has a length longer than at least a depth of the first through hole, and the clearance hole is provided in the load-receiving member at a position where the male thread portion can be screwed into the female thread portion when the pressing member is inserted into the first through hole, When the fastening screw portion is screwed in, the load-receiving surface receives a pressing load via the pressing surface, and the pressing member penetrates the first through hole, causing the pressing surface to press against the outer peripheral surface of the inner tube, The width between both end edges of the pressing surface and / or the position of the clearance hole in the load-receiving member is set so that a clearance is formed between the one flat surface of the pressing member on the load-receiving member side and the inner peripheral surface of the first through hole, causing the other end side of the load-receiving member to incline toward the outer peripheral surfaces of the inner and outer tubes and the other flat surface to come into contact with the inner peripheral edge of the first through hole, thereby increasing the pressing force at the edge of the one flat surface of the pressing surface against the outer peripheral surface of the inner tube according to the principle of leverage.

[0013] In order to achieve the object of the present invention, the integral structure of the inner and outer pipes of the present invention comprises: Both are integral structures in which inner and outer pipes extending in the vertical direction are fitted together, a first through hole and a second through hole are provided on an outer peripheral surface of the outer tube near one end of the fitting portion, and a female thread portion is provided on an inner peripheral surface of the second through hole; a load receiving member having opposing flat surfaces, one of which has a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, having opposing flat surfaces, and having a pressing surface at its tip, the pressing body having an L-shaped side cross section; a fastening screw portion having a male thread portion that can be threaded into the female thread portion and a head portion provided at one end of the male thread portion, the head portion having a push-in surface that can come into contact with the load-receiving surface formed on the male thread portion side; the pressing member has a length longer than at least a depth of the first through hole, and the clearance hole is provided in the load-receiving member at a position where the male thread portion can be screwed into the female thread portion when the pressing member is inserted into the first through hole, When the fastening screw portion is screwed in, the load-receiving surface receives a pressing load via the pressing surface, and the pressing member penetrates the first through hole, causing the pressing surface to press against the outer peripheral surface of the inner tube, Due to the formation of a clearance between the one flat surface of the pressing member on the load-receiving member side and the inner peripheral surface of the first through hole, the other end of the load-receiving member is inclined toward the outer peripheral surfaces of the inner and outer tubes, and the other flat surface comes into contact with the inner peripheral edge of the first through hole, creating a wedge effect at the corner including the edge on the side of the pressing surface that is inclined toward the outer peripheral surfaces of the inner and outer tubes, and the pressing force against the outer peripheral surface of the inner tube at the edge of the one flat surface of the pressing surface increases according to the principle of leverage.In this way, to ensure a predetermined fixed holding of the inner and outer tubes under a given weight of the supported object, a wedge effect is produced by the magnitude of the inclination angle of the L-shaped pressing body depending on the clearance between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube, and the width between the two end edges of the pressing surface and / or the position of the clearance hole in the load-receiving member are set.

[0014] With the inner and outer tube integrated structure having the above configuration, when the inner and outer tubes are fitted together to form an integrated structure, the degree of fixation and retention at the fitting portion becomes an issue depending on the application, such as a music stand such as a music stand or a microphone stand, or a medical stand such as an IV stand or a monitor stand. A first through hole and a second through hole are provided on the outer peripheral surface near one end of the outer tube on the fitting portion side, and the second through hole has a female screw portion on the inner peripheral surface, and by using an L-shaped side cross section pressing body and a fastening screw portion, the load receiving member of the pressing body is inserted from the pressing surface at the tip into the first through hole, and when the fastening screw portion is screwed in, the load receiving surface receives a pressing load and presses against the outer peripheral surface of the inner tube, a clearance is formed between one flat portion on the first through hole side of the pressing member and the first through hole, and the other end side of the load receiving member is fixed to the inner The first through hole is provided on the outer surface of the outer tube so as to straddle the longitudinal direction of the outer tube passing through the center of the female thread portion of the outer tube, inclined toward the outer surface of the outer tube, creating a wedge effect on the clearance side of the pressing surface, and the pressing force from the fastening screw portion is increased by the principle of leverage, with the part of the pressing surface opposite the clearance side as the fulcrum, the load-receiving surface as the force point, and the clearance side part of the pressing surface as the point of application.The thickness of the load-receiving member and / or the size of the first through hole are set, and the pressing surface is set to a shape such that when inserted into the first through hole, the expansion of the outer tube in the circumferential direction and the expansion of the outer tube in the longitudinal direction are each within predetermined ranges.Therefore, depending on the application, the inner and outer tubes can be sufficiently fixed and held by simply tightening the fastening screw portion 48 by hand.

[0015] In addition, a tubular sleeve that can be fitted onto the outer peripheral surface of the outer tube and through which the inner tube can pass through the inner hollow portion is provided at the end of the outer tube that fits with the inner tube, and the first through hole and the second through hole are preferably provided in the thickness direction from the outer peripheral surface of the tubular sleeve. Furthermore, it is preferable that the pressing body is passed through the first through hole, and the pressing surface is brought into surface contact with the outer peripheral surface of the outer tube or the tubular sleeve, while the outer peripheral surface of the inner tube on the opposite side of the surface contact portion of the pressing surface with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube or the tubular sleeve. Furthermore, it is preferable that the pressing surface has a hardness such that it is not deformed by being pressed against the outer peripheral surface of the inner tube, and that the pressing surface is formed so as to fit along the outer peripheral surface of the inner tube. In addition, the inner and outer tubes are arranged so as to extend in the vertical direction, with the inner tube on top and the outer tube on the bottom, and the fitting portions of the inner and outer tubes both preferably have a circular cross section.

[0016] Furthermore, it is preferable that each of the inner tube and the outer tube is cylindrical, and that the outer surface of the inner tube is pressed and fixed to the inner surface of the outer tube by pressing and fixing the outer surface of the inner tube opposite the portion pressed and fixed by the pressing surface against the inner surface of the outer tube in a line contact manner in the vertical direction, and that the outer tube is fixed and held to the inner tube by support at two points. Furthermore, the load bearing surface is preferably formed as an annular protruding peripheral surface around the clearance hole. Furthermore, the load receiving surface may be formed as a protruding surface on the end side of the load receiving member. In addition, the load receiving member and the pressing member may be provided so as to intersect at right angles. In addition, the clearance hole is provided on the other end side of the load-receiving member, and the tubular sleeve is provided with a through hole with a female thread portion on its inner surface so that a male thread portion can be screwed into the through hole via the clearance hole, and the length of the male thread portion is set so that the tip of the male thread portion does not come into contact with the outer surface of the inner tube when screwed together. Furthermore, the pressing surface may have an overall planar shape that is an inverted U-shape that is open toward the second through hole and can pass through the first through hole, and may be provided around the second through hole. Furthermore, the pressing surface may have an overall planar shape that is an inverted V shape that can pass through the first through hole and that opens toward the second through hole, and may be provided around the second through hole. In addition, the pressing surface may have an overall planar shape that is L-shaped so as to be able to pass through the first through hole, and may be provided around the second through hole.

[0017] The pressing surface may have an overall planar shape that is horizontally elongated and transverse to the longitudinal direction of a pipe that can pass through the first through hole and that passes through the center of the second through hole. Furthermore, it is preferable that the pressing member has a constant cross section in the longitudinal direction, and that the tip end surface forms the pressing surface. Furthermore, it is preferable that the pressing surfaces of the inverted U-shape and the inverted V-shape are arranged in line symmetry with respect to the longitudinal direction of the inner and outer tubes that passes through the center of the female screw. In addition, the inverted U-shaped pressing surface may be arranged concentrically with the second through hole.

[0018] The first through hole and the second through hole are preferably provided parallel to each other and obliquely at a predetermined angle with respect to the extending direction of the inner and outer tubes or the tubular sleeve. Furthermore, it is preferable that the first through hole is arranged at a predetermined angle relative to the extension direction of the inner and outer tubes or the tubular sleeve, while the second through hole is set perpendicular to the outer peripheral surface of the outer tube or the tubular sleeve. Furthermore, the tightening screw portion has a shank portion and the male screw portion extending downward from a lower surface of the shank portion, An annular surface is formed on the lower surface that surrounds the male thread portion, and by screwing the male thread portion into the female thread portion through the clearance hole, the lower surface of the shank portion and the load-receiving surface of the pressing body come into contact, and the fastening screw portion and the pressing body are integrally pressed and fixed to the inner tube and screwed into the outer tube. In addition, the clamping screw portion preferably has a head portion that can be held and turned by fingers at the end of the shank portion opposite the end of the male screw portion.

[0019] Furthermore, it is preferable that the fastening screw portion is fastened to prevent rotation of the inner and outer tubes of the tubular sleeve about the longitudinal direction, while fixing and holding the inner and outer tubes in a predetermined fitted position. Furthermore, it is preferable that the longitudinal length of the tubular sleeve and / or the length of the load-receiving member be set so that the tip of the male threaded portion of the fastening screw portion directly presses against the outer peripheral surface of the outer tube. Furthermore, the maximum inclination angle of the other end of the load-receiving member of the pressing body in the direction approaching the outer peripheral surface of the outer tube or the tubular sleeve due to fastening of the fastening screw portion is preferably set by the thickness of the tubular sleeve and / or the clearance between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube and / or the clearance between the pressing surface and the first through hole. In addition, it is preferable that a male thread be provided on the side peripheral surface of the one end of the outer tube, and a female thread be provided on the inner peripheral surface of the tubular sleeve, which can be threaded onto the male thread.

[0020] Preferably, the load receiving member and the pressing member are provided so as to form an obtuse angle, and the clearance hole is provided near the other end of the load receiving member. Furthermore, it is preferable that an annular shoulder portion is formed on the inner peripheral surface of the tubular sleeve, the width of the annular shoulder portion is large enough to be placed on the annular end face EN of the outer tube, and the tubular sleeve is rotatable around its longitudinal axis. Furthermore, it is preferable that the stand is a music stand that supports a music stand, a musical instrument, a speaker, or an amplifier at the end of the inner tube or the outer tube opposite to the fitting portion of the inner and outer tubes. In addition, it is preferable that the medical stand is provided with casters at the end of the inner tube or the outer tube opposite the fitting portion of the inner and outer tubes, making it movable, and that the end of the outer tube or the inner tube opposite the fitting portion of the inner and outer tubes supports either an intravenous drip, a monitor, or lighting. In addition, the diameter of the head, the diameter of the male thread portion and / or It is best to set the pitch. Furthermore, the increase in the clamping force by the fastening screw portion based on the principle of leverage is preferably achieved by setting the ratio of the clearance between the other flat surface of the pressing member and the center of the clearance hole to the distance between the other flat surface of the pressing member and the center of the second through hole.

[0021] In order to solve the above problems, the present invention provides an integrated structure of inner and outer pipes in which inner and outer pipes extending in the vertical direction are fitted together, a first through hole and a second through hole are provided on an outer peripheral surface of the outer tube near one end of the fitting portion, and a female thread portion is provided on an inner peripheral surface of the second through hole; a load receiving member having opposing flat surfaces, one of which has a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, having opposing flat surfaces, and having a pressing surface at its tip, and having an L-shaped cross-sectional shape; the pressing member has a length longer than at least a depth of the first through hole, and the clearance hole is provided in the load-receiving member at a position where the male thread portion can be screwed into the female thread portion when the pressing member is inserted into the first through hole, The load bearing member further includes a pressing lever having an annular peripheral surface that rotates around an axis parallel to the load bearing surface while contacting the load bearing surface, the annular circumferential surface is curved such that the radius from the axis increases from a first radius to a second radius, and the pressing body is movable within the first through hole in a thickness direction of the first through hole by rotation of a pressing lever; By rotating the pressing lever around an axis provided at a predetermined height from the outer peripheral surface of the outer tube, the pressing body starts pressing against the outer peripheral surface of the inner tube at a rotation position corresponding to an intermediate radius between the first radius and the second radius, and finishes pressing against the outer peripheral surface of the inner tube at a rotation position corresponding to the second radius, so that the pressing surface comes into surface contact with the outer peripheral surface of the inner tube, and the outer peripheral surface of the inner tube opposite to the surface contact portion of the pressing surface with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube, When the pressing lever rotates, the load-receiving surface receives a pressing load via the pressing surface, and the pressing member penetrates the first through hole, causing the pressing surface to press against the outer peripheral surface of the inner tube. Due to the formation of a clearance between the one flat surface of the pressing member on the first through hole side and the inner peripheral surface of the first through hole, the other end of the load-receiving member tilts toward the outer peripheral surfaces of the inner and outer tubes, creating a wedge effect at the corner including the edge of the one flat surface of the pressing surface. The first through hole is arranged on the outer peripheral surface of the outer tube so as to straddle the longitudinal direction of the outer tube passing through the center of the female thread portion of the outer tube, and the pressing surface is set to a shape such that, when inserted into the first through hole, the circumferential expansion of the outer tube and the longitudinal expansion of the outer tube each fall within a predetermined range.

[0022] In order to solve the above problems, the method for fixing and holding an inner and outer tube of the present invention comprises the steps of: a step of preparing a pressing body having an L-shaped cross section, the pressing body including a load receiving member having a load receiving surface and a clearance hole, a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface and having a pressing surface at its tip, a tubular sleeve having a first through hole and a second through hole on its outer circumferential surface, the second through hole having a female thread portion on its inner circumferential surface, and a fastening screw portion having a male thread portion that can be screwed into the female thread portion and having a pressing surface that can abut against the load receiving surface; a step of fitting a tubular sleeve having a circular inner cross section onto an upper end of the outer tube; inserting the inner tube into a tubular sleeve or an outer tube; rotating the tubular sleeve about the longitudinal axis of the outer tube to a desired rotational position; and a step of fastening the fastening screw portion to press the tubular sleeve from the outside toward the outer circumferential surface of the inner tube in the thickness direction of the tubular sleeve, thereby fixing the tubular sleeve at a desired rotational position around the longitudinal direction of the outer tube, and pressing the outer circumferential surface of the opposite side of the inner tube against the inner circumferential surface of the tubular sleeve or the outer tube, thereby fixing and holding the inner and outer tubes together in the longitudinal direction, the fixing and holding step includes a step of forming a clearance between the one flat surface portion of the pressing member on the second through hole side and the second through hole, causing the other end side of the load-receiving member to incline toward the outer peripheral surfaces of the inner and outer tubes, thereby generating a wedge effect on the clearance side portion of the pressing surface, and increasing the pressing force by the fastening screw portion by the principle of leverage, The configuration has the following.

[0023] It is also preferable to further include a step of pressing the tubular sleeve from the outside toward the outer surface of the outer tube in the thickness direction of the tubular sleeve to fix the tubular sleeve in a desired rotational position around the longitudinal direction of the outer tube, while pressing the outer surface of the opposite side of the outer tube against the inner surface of the tubular sleeve, thereby fixing and holding the inner and outer tubes together in the longitudinal direction. Furthermore, the inner peripheral surface of the tubular sleeve is provided with a reduced diameter portion that is set larger than the diameter of the inner tube and an expanded diameter portion that is set larger than the diameter of the outer tube, and an annular shoulder portion is formed at a connecting portion between the reduced diameter portion and the expanded diameter portion, The annular shoulder is preferably placed on the annular upper end surface of the outer tube, and the tubular sleeve is rotated to the desired rotational position about the longitudinal axis of the outer tube.

[0024] In order to solve the above problems, the integral structure of the inner and outer pipes of the present invention comprises: An inner and outer pipe integrated structure in which the inner and outer pipes are fitted together, a through hole having a female thread formed on an inner peripheral surface thereof, the through hole being provided on an outer peripheral surface thereof near one end of the outer tube on the fitting portion side; a pressing body having a shape that can be inserted into the through hole, the pressing body having a load receiving surface on one end surface and a pressing surface against the outer circumferential surface of the inner pipe on the other end surface; a fastening screw portion having a male thread portion that can be screwed into the female thread portion and a head portion provided at one end of the male thread portion, the male thread portion side of the head portion having a push-in surface that can come into contact with the load-receiving surface; The pressing body has a length shorter than the depth of the through hole, When the fastening screw portion is screwed in, the tip surface of the male threaded portion rotates around the longitudinal direction of the male threaded portion, while the load-receiving surface receives a pressing load without rotating together with the male threaded portion, and the pressing body presses the pressing surface against the outer peripheral surface of the inner tube in a tight contact manner through the through hole.

[0025] According to the integrated inner and outer tube structure having the above-mentioned configuration, when the inner and outer tubes are fitted together to form an integrated structure, the degree of fixation and retention at the fitting portion becomes an issue depending on the application, such as a music stand such as a music stand or a microphone stand, or a medical stand such as an IV stand or a monitor stand. However, a through hole having a female thread portion formed on the inner peripheral surface is provided on the outer peripheral surface near one end of the fitting portion of the outer tube, and the outer tube has a shape that can be inserted into the through hole, and a load receiving surface is formed on one end face and a pressing surface against the outer peripheral surface of the inner tube is formed on the other end face, and the pressing body has a length shorter than the depth of the through hole and can be screwed into the female thread portion. The fastening screw portion has a male threaded portion and a head portion provided at one end of the male threaded portion, and the male threaded portion side of the head has a push-in surface formed thereon that can come into contact with the load-bearing surface.When the fastening screw portion is screwed in, the tip surface of the male threaded portion rotates around the longitudinal direction of the male threaded portion, while the load-bearing surface receives a pressing load without rotating together with the male threaded portion, and the pressing surface presses against the outer peripheral surface of the inner tube in a tight contact manner through the through hole.This makes it possible to easily and sufficiently fix and hold the inner and outer tubes with the required fixing and holding force depending on the application by manually tightening the fastening screw portion.

[0026] The flexible pressing body that can be inserted into the second through hole preferably has a hardness that allows the pressing surface to be deformed into a shape that conforms to the outer circumferential surface of the inner tube by screwing in the fastening screw portion.

[0027] In order to solve the above problems, the present invention provides a tubular sleeve for an inner and outer integral structure, comprising: A tubular sleeve that can be fitted onto the outer peripheral surface of the outer tube at an end of the outer tube on the side of the fitting portion with the inner tube, and through which the inner tube can pass through an inner hollow portion, A first through hole and a second through hole are provided on an outer peripheral surface near one end, and a female screw portion is provided on an inner peripheral surface of the second through hole, a load receiving member having opposing flat surfaces, one of the flat surfaces having a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member having an L-shaped cross section, the pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, the opposing flat surfaces, the pressing member penetrating the first through hole, and having a pressing surface at its tip end, the pressing member being capable of pressing against the outer peripheral surface of the inner tube; The fastening screw has a male threaded portion that can be screwed into the female threaded portion, and a head portion provided at one end of the male threaded portion, and on the male threaded portion side of the head portion is a fastening screw portion that has a push-in surface that can abut against the load-receiving surface.

[0028] Preferably, the outer circumferential surface of one end of the outer tube is provided with a male thread, and the inner circumferential surface of the tubular sleeve is provided with a female thread that can be threaded onto the male thread. BEST MODE FOR CARRYING OUT THE INVENTION

[0029] A first embodiment of the inner and outer pipe integrated structure 10 of the present invention will be described in detail below with reference to the drawings, using a music stand as an example. As shown in Figures 1 to 8, the inner and outer pipe integrated structure 10 fixes and holds the inner pipe X1 and outer pipe X2, which fit together, in the longitudinal direction of the pipes, and is roughly composed of the inner pipe X1 and the outer pipe X2, a tubular sleeve 54 attached and fixed to the outer peripheral surface of one end of the outer pipe X2, a pressing body 38 having a pressing surface 34 that can be pressed against the outer peripheral surface 58 of the inner pipe X1 from the outer peripheral surface 56 side of the tubular sleeve 54, and a fastening screw portion 48 that can press and fix the pressing body 38 against the outer peripheral surface 58 of the inner pipe X1. The length, thickness and cross-sectional shape of each of the inner tube X1 and the outer tube X2 may be selected depending on the application, and as will be described later, the fitting length between the inner tube X1 and the outer tube X2 is adjusted so that the overall length of the inner tube X1 and the outer tube X2 can be adjusted.

[0030] For example, each of the inner tube X1 and the outer tube X2 is hollow cylindrical, and the inner peripheral surface 60 of the outer tube X2 is inserted from one end opening into one end opening of the outer peripheral surface 58 of the inner tube X1, so that the outer tube X2 fits onto the inner tube X1. Note that from the viewpoint of fitting the outer tube X2 onto the inner tube X1, the outer tube X2 needs to be hollow, but does not necessarily need to have a circular cross section, while the inner tube X1 does not need to be hollow and may be solid, for example, from the viewpoint of ensuring strength. When the outer tube X2 and the inner tube X1 are fitted together, a slight clearance C1 may be provided between the inner peripheral surface 60 of the outer tube X2 and the outer peripheral surface 58 of the inner tube X1, as long as the outer tube X2 is fixedly held in the longitudinal direction relative to the inner tube X1 by the fastening screw portion 48 via the pressing body 38, as will be described later. The slight clearance C1 is, for example, 0.05 mm to 0.1 mm.

[0031] As shown in Figures 2 to 4, a first through hole 16 is provided on the outer peripheral surface 56 of the tubular sleeve 54, and a female thread portion 22 is provided adjacent to the first through hole 16. The distance between the first through hole 16 and the female thread portion 22 may be selected depending on the application of the inner and outer pipe integrated structure 10, as will be described later. More specifically, the tubular sleeve 54 is a hollow cylinder that can be fitted onto one end of the outer tube X2 from one end, and the inner tube X1 is inserted into the other end with a predetermined clearance between it and the inner surface 57 of the tubular sleeve 54. The tubular sleeve 54 is preferably made of metal and is hollow cylindrical, with the diameter of the inner surface set to be at least larger than the inner diameters of the inner tube X1 and the outer tube X2, but the outer shape does not necessarily have to be cylindrical and may, for example, be cocoon-shaped with a wider diameter in the center. The thickness th and longitudinal length L3 of the tubular sleeve 54 may be set appropriately as long as the inner tube X1 and outer tube X2, which fit together, can be fixed and held in place in the longitudinal direction of the tubes, for example, a few millimeters or a few centimeters.

[0032] The tubular sleeve 54 is composed of a first outer fitting portion 53 extending from one end toward the outer tube X2 and fitting onto the outer tube X2 with its inner circumferential surface 57 facing the outer circumferential surface 50 of the outer tube X2 with a first predetermined clearance, and a second outer fitting portion 55 extending from one end toward the inner tube X1 and fitting onto the inner tube X1 with its inner circumferential surface facing the outer circumferential surface of the inner tube X1 with a second predetermined clearance. The first through hole 16 is provided in the first outer fitting portion 53, and the diameter of the second outer fitting portion 55 is set smaller than the diameter of the first outer fitting portion 53. The second outer fitting portion 55 forms a reduced diameter portion, and the first outer fitting portion 53 forms an expanded diameter portion. An annular shoulder 94 is formed at the connection between the first outer fitting portion 53 and the second outer fitting portion 55, and the annular shoulder 94 can be placed on the annular end face EN of the outer tube X2. The clearance between the inner peripheral surface 57 of the tubular sleeve 54 and the outer peripheral surface 58 of the inner tube X1, the clearance between the inner peripheral surface 57 of the tubular sleeve 54 and the outer peripheral surface 50 of the outer tube X2, and the clearance C1 between the inner tube X1 and the outer tube X2 may be determined from the perspective appropriate for use as a music stand, and may be, for example, 0.5 mm to 1 mm. In addition, by adjusting the width of the annular shoulder portion 94 and adjusting the vertical positional relationship between the inner tube X1 and the outer tube X2, the clearance C1 between the inner tube X1 and the outer tube X2 can be eliminated, and by fastening the fastening screw portion 48, the outer surface 58 of the inner tube X1, together with the inner surface 57 of the tubular sleeve 54, can be pressed and fixed against the inner surface 60 of the outer tube X2. As a variant, a male thread may be provided on the side surface of one end of the outer tube X2, and a female thread that can be threaded onto the male thread may be provided on the inner surface of the tubular sleeve 54, and the upper end level of the tubular sleeve 54 can be adjusted depending on the amount of threading of the tubular sleeve 54 into the outer tube X2.

[0033] The first through hole 16 is provided so as to extend in the radial direction of the inner and outer tubes X1, X2. More specifically, the first through hole 16 is an elongated opening, and the width of the opening need only be such that the pressing member 36 of the pressing body 38 can pass through it in the thickness direction. As will be described later, since the pressing body 38 is fastened and fixed to the outer tube X2 via the fastening screw portion 48, there is no need for the pressing body 38 to pass through the first through hole 16 provided in the outer peripheral surface 50 of the outer tube X2 in an interference fit manner, and a clearance is allowed between the periphery of the first through hole 16 and the outer peripheral edge of the pressing body 38.

[0034] As shown in FIG. 5, the pressing body 38 is positioned on the outer circumferential surface 56 of the tubular sleeve 54, passes through the first through-hole 16, and comes into contact with the outer circumferential surface 58 of the inner tube X1. More specifically, the pressing body 38 has an L-shaped side cross section along the center line, has opposing flat surfaces 43, has a load receiving surface 26 on one of the flat surfaces 43A, and is equipped with a load receiving member 30 having a clearance hole 28 penetrating in the thickness direction between the opposing flat surfaces 43, and a pressing member 36 extending from one end 32 of the load receiving member 30 toward the opposite side of the load receiving surface 26, has opposing flat surfaces 41, and is equipped with a pressing surface 34 at its tip, and the load receiving member 30 and the pressing member 36 are arranged so as to be perpendicular to each other. The pressing member 36 has a length that is at least longer than the depth of the first through hole 16, and the clearance hole 28 is provided in the load-receiving member 30 at a position where the male threaded portion 40 can be screwed into the female threaded portion 22 when the pressing member 36 is inserted into the first through hole 16. A clearance hole 68 is provided on the other end 33 side of the load-receiving member 30, and a through hole 66 with a female thread portion on the inner peripheral surface is provided in the tubular sleeve 54 so that a male thread portion 70 can be threaded into the through hole 66 via the clearance hole 68. The length of the male thread portion 70 is set so that the tip of the male thread portion 70 does not come into contact with the outer peripheral surface 58 of the inner tube X1 when threaded. This makes it possible to prevent the pressing body 38 from falling off when the fastening screw portion 48 is completely removed from the female thread portion 22, and the tightening force of the male thread portion 70 can be set from this perspective, and the diameter of the male thread portion 70 can be smaller than the diameter of the male thread portion 40. As a modified example, as shown in Figure 35, the clearance hole 28 through which the male thread portion 40 of the fastening screw portion 48 can pass does not have to be formed by a closed inner surface that passes through the thickness direction of the load-receiving member 30 as shown in Figure 5, but may be an open clearance hole 28 rather than being formed by a closed inner surface, as shown in Figure 35, as long as it is a passing zone for the male thread portion 40 of the fastening screw portion 48.

[0035] The pressing surface 34 has a hardness sufficient to prevent it from deforming when pressed against the outer peripheral surface 58 of the inner pipe X1, and has a curved shape that follows the outer peripheral surface 58 of the inner pipe X1 so as to be in surface contact with the outer peripheral surface 58 of the inner pipe X1. For example, if the outer peripheral surface 58 of the inner pipe X1 is the outer surface of a cylinder, the pressing surface 34 has an arc-shaped cross section with the same diameter. In this case, unlike the fastening thread portion 48, the pressing body 38 itself does not need to be rotated toward the outer peripheral surface 58 of the inner pipe X1, so it is possible to press the pressing surface 34 against the outer peripheral surface 58 of the inner pipe X1 with the arc-shaped cross section oriented to match the outer peripheral surface 58 of the inner pipe X1. The load-receiving surface 26 is formed as an annular protrusion peripheral surface around the clearance hole 28, and the width of the annular protrusion peripheral surface is set so that when the fastening screw portion 48 is screwed in, the pushing surface 46 abuts against the load-receiving surface 26, and the pressing load is transmitted to the pressing body 38 via the load-receiving surface 26, thereby enabling the pressing surface 34 to be pressed against the outer peripheral surface 58 of the inner tube X1. Alternatively, the load receiving surface 26 may be formed as a protruding surface on the end side of the load receiving member 30 .

[0036] When the fastening screw portion 48 is screwed in, the load receiving surface 26 receives a pressing load, and the pressing member 36 penetrates the first through hole 16, and when the pressing surface 34 presses against the outer peripheral surface 58 of the inner pipe X1, the first through hole 16 side of the pressing member 36 By forming a clearance between one flat portion 41A and the first through hole 16, the other end of the load-receiving member 30 is inclined toward the outer peripheral surfaces of the inner and outer tubes X1 and X2, creating a wedge effect on the clearance side of the pressing surface 34, and the pressing force by the fastening screw portion 48 is increased by the principle of leverage.The first through hole 16 is arranged on the outer peripheral surface 50 of the outer tube X2 so as to straddle the longitudinal direction of the outer tube X2 passing through the center of the female thread portion 22 of the outer tube X2, and the thickness t2 of the load-receiving member 30 and / or the size of the first through hole 16 are set, and the pressing surface 34 is set to a shape such that when inserted into the first through hole 16, the circumferential expansion of the outer tube X2 and the longitudinal expansion of the outer tube X2 each fall within a predetermined range. The inner tube X1 and the outer tube X2 are each cylindrical, and the inner tube X1 and the outer tube X2 are pressed and fixed together via the tubular sleeve 54 by pressing and fixing the outer peripheral surface 58 of the inner tube X1 opposite the pressed and fixed portion by the pressing surface 34 against the inner peripheral surface 57 of the second exterior portion 57 of the tubular sleeve 54 in a line contact manner in the vertical direction, and the outer tube X2 is fixed and held to the inner tube X1 by support at two points. As a variant, if the material or surface treatment of the outer tube X2 does not pose a risk of damaging or denting the outer surface 50, the longitudinal length L3 of the tubular sleeve 54 or the length L2 of the load-receiving member 30 may be set so that the tip of the male thread portion 40 of the fastening screw portion 48 directly presses against the outer surface 50 of the outer tube X2.

[0037] The overall planar shape of the pressing surface 34 (hereinafter, this means the shape projected onto a plane) is an inverted U-shape that opens toward the second through-hole 18 and can pass through the first through-hole 16, and is arranged concentrically around the second through-hole 18. The width WD of the band is constant and is set so as to ensure a desired clearance between the first through-hole 16 and the band's arc length, which may be determined from the perspective of the wedge effect or the principle of leverage, which will be described later, is at most semicircular. As a modified example, the overall planar shape of the pressing surface 34 may be an inverted V shape that opens toward the second through hole 18 and can pass through the first through hole 16, and may be provided around the second through hole 18. The inverted U-shaped and inverted V-shaped pressing surfaces 34 are arranged in line symmetry with respect to the longitudinal direction of the inner and outer pipes X1 and X2, which passes through the center of the female screw portion 22, respectively. Regarding the overall planar shape of the pressing surface 34 of the L-shaped pressing body 38, the inverted U-shaped band is composed of a pair of parallel linear portions and a curved portion connecting one end of each linear portion, and each of the pair of linear portions does not have to be straight, and as long as it is possible to fix and hold the inner and outer tubes X1 and X2 in the vertical direction, they may be composed of all curved portions as part of an ellipse as a whole, for example. To fix and hold the inner and outer tubes X1, X2 in the vertical direction and prevent relative rotation of the inner and outer tubes X1, X2 around the longitudinal direction of the tubes, the overall planar shape of the pressing surface 34 of the L-shaped pressing body 38 is preferably a quarter-circular band concentric with the female thread, with one end located in the longitudinal direction of the tube and the other end located in the circumferential direction of the tube, or it may be an L-shaped band consisting of a vertical linear portion extending in the longitudinal direction of the tube around the female thread and a horizontal linear portion extending in the circumferential direction of the tube from one end of the vertical linear portion. The overall length and width of the band and the spacing from the female thread may all be selected appropriately. As a further modification, the overall planar shape of the pressing surface 34 may be an L-shape that can pass through the first through-hole 16 and that is provided around the second through-hole 18. In this case, by arranging one side of the L-shape to extend in the longitudinal direction of the inner and outer tubes X1, X2 beside the female thread portion 22 and the other side of the L-shape to extend in the circumferential direction of the inner and outer tubes X1, X2 below the female thread portion 22, similar to the inverted U-shape and inverted V-shape, the other side of the L-shape functions to fix and hold the inner and outer tubes X1, X2 in the vertical direction, while the one side of the L-shape functions to suppress relative rotation of the inner and outer tubes X1, X2 around the longitudinal direction of the tubes, which can be effectively utilized in applications such as a forklift. As a further modification, the overall planar shape of the pressing surface 34 may be a horizontally elongated shape that is transverse to the longitudinal direction of a pipe that can pass through the first through hole 16 and that passes through the center of the second through hole 18 . The pressing member 36 has a rectangular cross section, and the pressing surface 34 is formed on its end surface. However, as a modified example, only the end of the pressing member 36 that forms the pressing surface 34 may be tapered to widen toward the pressing surface 34, provided that it can be inserted into the first through-hole 16, as long as the desired clearance can be secured.

[0038] As shown in FIG. 6, the fastening screw portion 48 is configured to be able to press and fix the pressing body 38 against the outer peripheral surface 58 of the inner tube X1, and the fastening screw portion 48 has a shank portion 82 and a male thread portion 40 extending downward from the underside of the shank portion 82, the male thread portion 40 being able to be threaded into the female thread portion 22, and a pressing surface 46 surrounding the male thread portion 40 is formed on the underside. After adjusting the fitting position of the inner pipe X1 relative to the outer pipe X2, the male threaded portion 40 is screwed into the female threaded portion 22 using the fastening screw portion 48, and the pressing body 38 is passed through the first through-hole 16 to be pressed and fixed against the outer peripheral surface 58 of the inner pipe X1. The tightening torque of the fastening screw portion 48 can be adjusted by adjusting the diameter D of the head portion 44 and / or the pitch of the male screw portion 40 (female screw portion 22). The fastening screw portion 48 has a head portion 44 that can be gripped and rotated with fingers at the end of the shank portion 82 opposite the end on the male thread portion 40 side. The diameter D of the head portion 44 is preferably as large as possible so that it can be gripped with fingers with little force and rotated, and from the viewpoint of preventing slippage, it may be possible to provide multiple shallow grooves spaced apart in the circumferential direction. The distance between the first through hole 16 and the female thread portion 22 is set so that the pressing member 36 of the pressing body 38 can be inserted into the first through hole 16 and so that the male thread portion 40 of the fastening screw portion 48 can pass through the clearance hole 28 of the pressing member 36. Regarding the fixing and holding of the inner and outer tubes X1 and X2 by the fastening screw portion 48, it is preferable to set the diameter D of the head portion 44 and / or the pitch of the male thread portion 40 so that the inner and outer tubes X1 and X2 are sufficiently fixed and held by tightening the fastening screw portion 48 by hand.

[0039] Regarding the use of the inner and outer pipe integrated structure 10, the first through hole 16 is provided to extend circumferentially of the inner and outer pipes X1 and X2, the inner and outer pipes X1 and X2 are oriented vertically, and either the inner or outer pipe X1 or X2 supports a heavy load at a predetermined height. In particular, when the integral inner and outer pipe structure 10 is used to adjust the fitting length of the inner and outer pipes X1, X2 extending in the vertical direction to fix and hold a heavy object at a predetermined height, from the viewpoint of supporting the weight of the heavy object by the frictional force between the pressing surface 34 of the pressing body 38 and the outer peripheral surface 58 of the inner pipe X1, the greater the resistance of the pressing surface 34 of the pressing body 38 against the outer peripheral surface 58 of the inner pipe X1, i.e., the greater the tightening force of the fastening screw portion 48, and for this reason, the pressing body 38, fastening screw portion 48, and inner and outer pipes X1, X2 that constitute the integral inner and outer pipe structure 10 are preferably made of metal.

[0040] As a variant, the inner and outer pipe integrated structure 10 may be made of resin from the viewpoint of lightness, and in particular, even if openings for the first through hole 16 and the female threaded portion 22 are provided, it is preferable to ensure a certain thickness from the viewpoint of ensuring strength around them.

[0041] The following will explain a method for fixing and holding the inner and outer pipes X1 and X2, particularly in the case of existing inner and outer pipes X1 and X2 that fit together: a step of preparing a load-receiving member (30) having a load-receiving surface (26) and a clearance hole (28); a pressing member (36) extending from one end (32) of the load-receiving member (30) toward the opposite side of the load-receiving surface (26) and having a pressing surface (34) at its tip, the pressing body (38) having an L-shaped cross section; a tubular sleeve (54) having a first through hole (16) and a second through hole (18) on its outer circumferential surface, the second through hole (18) having a female thread portion (22) on its inner circumferential surface; and a fastening screw portion (48) having a male thread portion (40) that can be threaded onto the female thread portion (22) and having a pressing surface (46) that can come into contact with the load-receiving surface (26); a step of fitting a tubular sleeve 54 having a circular inner circumferential surface on the upper end of the outer tube X2; fitting the inner tube X1 into the tubular sleeve 54 or the outer tube X2; rotating the tubular sleeve 54 about the longitudinal direction of the outer tube X2 to a desired rotational position; and fastening the fastening screw portion 48 to press the tubular sleeve 54 from the outside toward the outer circumferential surface 58 of the inner tube X1 in the thickness direction of the tubular sleeve 54, thereby fixing the tubular sleeve 54 at a desired rotational position around the longitudinal direction of the outer tube X2, and pressing the outer circumferential surface 58 on the opposite side of the inner tube X1 against the inner circumferential surface 60 of the tubular sleeve 54 or the outer tube X2, thereby fixing and holding the inner and outer tubes X1 and X2 together in the longitudinal direction, The fixing and holding stage includes a stage in which a clearance is formed between one flat portion 41A on the second through hole 18 side of the pressing member 36 and the second through hole 18, causing the other end of the load-receiving member 30 to incline toward the outer peripheral surfaces of the inner and outer tubes X1 and X2, creating a wedge effect on the corner of the pressing surface 34, including the edge portion closer to the load-receiving member 30, against the outer peripheral surface 58 of the inner tube X1, and increasing the pressing force by the fastening screw portion 48 by the principle of leverage.

[0042] Furthermore, it is preferable to include a step of 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, thereby fixing the tubular sleeve 54 at a desired rotational position around the longitudinal direction of the outer tube X2, and pressing the outer peripheral surface on the opposite side of the outer tube X2 against the inner peripheral surface 57 of the tubular sleeve 54, thereby fixing and holding the inner and outer tubes X1, X2 together in the longitudinal direction. The inner peripheral surface 57 of the tubular sleeve 54 is provided with a reduced diameter portion that is set larger than the diameter of the inner tube X1 and an expanded diameter portion that is set larger than the diameter of the outer tube X2, and an annular shoulder portion 94 is formed at the connection between the reduced diameter portion and the expanded diameter portion. The annular shoulder portion 94 is preferably placed on the annular end face EN of the outer tube X2, and the tubular sleeve 54 is rotated to a desired rotational position around the longitudinal direction of the outer tube X2.

[0043] Hereinafter, a case where the inner and outer pipe integrated structure 10 is applied to an existing music stand will be described, taking a music stand as an example of a music stand. As shown in Figure 1, in existing music stand stands, inner and outer tubes X1 and X2 fit together, with the music stand connected to the upper end of the inner tube X1 and the tripod part LG connected to the lower end of the outer tube X2, which holds the music stand stand upright. The fit between the lower end of the inner tube X1 and the upper end of the outer tube X2 is, for example, screwed in such a way that the height can be adjusted, with the screw passing sideways through a through hole in the outer tube X2 and the tip of the screw hitting the outer surface of the inner tube X1 to hold it in place.

[0044] First, the screws are released and removed, and then the fitting position between the lower end of the inner tube X1 and the upper end of the outer tube X2 is adjusted according to the desired height of the music stand F. At that position, while supporting the inner tube X1 with one hand, the tubular sleeve 54 of the integrated inner and outer tube structure 10 is fitted onto the upper end of the outer tube X2 from one opening with the other hand, with the annular shoulder 94 of the tubular sleeve 54 resting on the annular end face EN of the outer tube X2. With the tubular sleeve 54 fitting over the upper end of the outer tube X2, a predetermined clearance is maintained 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 circumferential surface 58 of the inner tube X1, and the tubular sleeve 54 is supported by the upper end of the outer tube X2 and can freely rotate about the longitudinal direction of the inner and outer tubes X1 and X2. Next, with the other hand, rotate the tubular sleeve 54 around the longitudinal direction of the inner and outer tubes X1 and X2 until it is positioned at the desired rotation position, for example, a position where the fastening screw portion 48 can be fastened with the right hand in the case of a right-handed person.

[0045] Next, while supporting the inner tube X1 with one hand, tighten the fastening screw portion 48 with the other hand to prevent the inner and outer tubes X1 and X2 of the tubular sleeve 54 from rotating around the longitudinal direction, and also to hold the inner and outer tubes X1 and X2 fixed to each other, and set the music stand F to the desired height. More specifically, the fastening screw portion 48 is passed through the clearance hole 28, and the male threaded portion 40 is screwed into the female threaded portion 22, while the pressing body 38 is passed through the first through hole 32 of the first outer fitting portion 53, and the pressing surface 34 is brought into surface contact with the outer peripheral surface 58 of the inner pipe X1, and the outer peripheral surface 58 of the inner pipe X1 on the opposite side of the surface contact portion of the pressing surface 34 with the inner pipe X1 can be pressed and fixed against the inner peripheral surface 60 of the outer pipe X2 at the fitting portion of the inner and outer pipes X1 and X2. The tubular sleeve 54 attached to the outer surface of one end of the outer tube X2 is free to rotate around the longitudinal direction of the inner and outer tubes X1, X2, and by screwing in the fastening screw portion 48, this rotation of the tubular sleeve 54 can be fixed and the inner and outer tubes X1, X2 can be fixed and held relative to each other in the longitudinal direction of the inner and outer tubes X1, X2.When such an inner and outer tube integrated structure 10 is applied to a music stand, the simple structure makes it possible to improve usability when adjusting the stand height.

[0046] The action of the L-shaped pressing body 38 will be described with reference to FIG. The load-receiving member 30 and the pressing member 36 of the L-shaped pressing body 38 are perpendicular to each other, and the first through hole 16 and the second through hole 18, which is the female thread portion 22, provided in the tubular sleeve 54 are arranged perpendicular to the longitudinal direction of the tubular sleeve 54 and in 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 male thread portion 40 of the fastening screw portion 48 is passed through the clearance hole 28 of the load-receiving member 30 of the L-shaped pressing body 38 and screwed into the second through-hole 18 of the tubular sleeve 54. In this state, the load-receiving member 30 is parallel to the outer surface 56 of the tubular sleeve 54, i.e., the pressing member 36 is oriented perpendicular to the outer surface 56 of the tubular sleeve 54.

[0047] By screwing in the fastening screw portion 48, the pushing surface 46 of the head portion 44 abuts against the load-receiving surface 26 of the load-receiving member 30 of the L-shaped pressing body 38, the load-receiving member 30 of the L-shaped pressing body 38 approaches the outer surface 56 of the tubular sleeve 54, and the pushing surface 34 of the L-shaped pressing body 38 approaches the outer surface 58 of the inner tube X1 through the first through-hole 16. By further screwing in the fastening screw portion 48, the pressing surface 34 of the L-shaped pressing body 38 is formed into a shape that follows the outer peripheral surface 58 of the inner tube X1, i.e., an arc-shaped curved surface of a predetermined diameter, so that the entire body presses against the outer peripheral surface 58 of the inner tube X1 in a surface contact manner. By further screwing the fastening screw portion 48, the L-shaped pressing body 38 is supported at one point at its end by the pressing surface 34 of the pressing member 36, and the load-receiving member 30 of the L-shaped pressing body 38 begins to tilt in a direction in which the end 32 on the pressing member 36 side and the opposite end 33 approach the outer surface 56 of the tubular sleeve 54, thereby changing the contact of the pressing surface 34 of the pressing member 36 with the outer peripheral surface 58 of the inner tube X1 from surface contact to line contact.

[0048] More specifically, the contact area of ​​the pressing surface 34 of the pressing member 36 decreases toward the edge 55 extending circumferentially of the tubular sleeve 54 on the load-receiving member 30 side, and the edge 55 of the pressing surface 34, i.e., the intersection angle between the pressing surface 34 and one of the flat portions 41A, bites into the outer peripheral surface 58 of the inner tube X1, thereby creating a so-called wedge effect and increasing the pressing pressure against the outer peripheral surface 58 of the inner tube X1. As a result, compared to when the entire pressing surface 34 of the L-shaped pressing body 38 presses the outer surface 58 of the inner tube X1 in a surface contact manner, if a heavy object such as a music stand or speaker is supported at the upper end of the inner tube X1, the weight of the object will make it impossible to maintain the fixation between the inner and outer tubes X1 and X2, and over time, if the inner tube X1 supporting the heavy object begins to slip downward relative to the outer tube X2, the above-mentioned wedge effect will be exerted even more, making it possible to strengthen the fixation of the inner tube X1 to the outer tube X2 in a downward direction, of the inner and outer tubes X1 and X2 extending in the vertical direction. For this reason, with regard to the positional relationship of the pressing surface 34 of the L-shaped pressing body 38 with respect to the female thread portion 22, if the distance between the pressing surface 34 of the L-shaped pressing body 38 and the female thread portion 22 is the same, it is more advantageous to position the pressing surface 34 of the L-shaped pressing body 38 below the female thread portion 22, i.e., to position the first penetration 16 below the female thread portion 22, than to position it above, in order to prevent the inner tube X1 from slipping downward relative to the outer tube X2 due to the increased wedge effect. The maximum inclination angle ΘMAX of the L-shaped pressing body 38 is determined depending on the position of the clearance hole 28 on the load-receiving member 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 (clearance C1 between the inner and outer tubes X1 and X2 + thickness th of the tubular sleeve 54), and / or the clearance 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 clearance C between the L-shaped pressing body 38 and the first through hole 16 can be determined depending on the expected degree of strengthening of the vertical fixation of the inner and outer tubes X1 and X2. For example, if the tubular sleeve 54 is made of resin, in order to ensure strength, the thickness th of the tubular sleeve 54 can be made large, the opening area of ​​the first through hole 16 can be made small, and the clearance C can be made narrow, while the position of the clearance hole 28 on the load-receiving member 30 can be adjusted closer to the end 33 opposite the end 32 on the pressing member 36 side.If the tubular sleeve 54 is made of metal, the thickness th of the tubular sleeve 54 can be made small, and the opening area of ​​the first through hole 16 can be made large.

[0049] In this case, using the edge 55 of one flat portion 41A of the pressing surface 34 on the first through hole 16 side of the pressing member 36 as the point of application, the edge of the other flat portion 41B opposite to the one flat portion 41A of the pressing surface 34 as the fulcrum, and the center of the clearance hole 28 of the load-receiving member 30 as the point of application, according to the principle of leverage, the tightening force of the fastening screw portion 48 pressing against the outer peripheral surface 58 of the inner tube X1 at the point of application increases in accordance with the ratio of the distance D2 between the fulcrum and the point of application and the distance D1 between the fulcrum and the point of application. However, the smaller the distance D1 and the larger the distance D2, in other words, the smaller the width of the pressing surface 34 in the longitudinal direction of the inner and outer tubes X1 and X2, and the closer the position of the clearance hole 28 of the load-receiving member 30 is to the other end 33, the more firmly the inner and outer tubes X1 and X2 can be fixed and held in place with a constant tightening force exerted by the fastening screw portion 48. In relation to the above-mentioned wedge effect, when the size of the first through hole 16 is constant, the smaller the longitudinal width of the inner and outer tubes X1, X2 of the pressing surface 34 is, the larger the clearance C formed between one flat portion 41A of the pressing member 36 on the first through hole 16 side and the inner circumferential surface of the first through hole 16 becomes. As a result, it is possible to increase the maximum inclination angle ΘMAX of the L-shaped pressing body 38, and it is possible to adjust the wedge effect and the increase in the tightening force due to tightening of the fastening screw portion 48 based on the principle of leverage. The increase in the clamping force by the fastening screw portion 48 using the principle of leverage may be achieved by setting the ratio of the distance between the first through hole 16 and the clearance hole to the distance between the first through hole 16 and the second through hole 18. As described above, the expansion of the pressing surface 34 in the longitudinal direction of the inner and outer tubes X1, X2 is related to the increase in the fastening force due to the tightening of the fastening screw portion 48 due to the wedge effect and the principle of leverage. On the other hand, the expansion of the pressing surface 34 in a direction perpendicular to the longitudinal direction of the inner and outer tubes X1, X2, i.e., in the circumferential direction of the inner and outer tubes X1, X2, is preferably set taking into consideration that the component of the pressing force applied to the outer peripheral surface 58 of the inner tube X1 by the fastening force of the fastening screw portion 48 gradually decreases as the pressing surface 34 expands 90 degrees circumferentially to the left and right, from the center of the female threaded hole 22. It is therefore preferable that the pressing surface 34 expands in the circumferential direction so as to straddle the longitudinal direction of the inner and outer tubes X1, X2 which passes through the center of the female threaded hole 22.

[0050] As described above, when the fastening screw portion 48 is screwed in, the load receiving surface 26 receives a pressing load via the pressing surface 46, and the pressing member 36 penetrates the first through hole 16, causing the pressing surface 34 to press against the outer circumferential surface 58 of the inner pipe X1. Due to the formation of a clearance between one flat portion 41A of the pressing member 36 on the load receiving member 30 side and the inner circumferential surface of the first through hole 16, the other end side of the load receiving member 30 is inclined toward the outer circumferential surfaces of the inner and outer pipes, and the other flat portion 41B comes into contact with the inner circumferential edge of the first through hole 16. As a result, a wedge effect is generated at the corner portion including the edge portion of the pressing surface 34 on the side inclined toward the outer circumferential surfaces of the inner and outer pipes, and the pressing force at the edge portion of the one flat portion 41A of the pressing surface 34 against the outer circumferential surface 58 of the inner pipe X1 increases according to the principle of leverage, thereby ensuring a predetermined fixed holding of the inner and outer pipes under a given weight of the object to be supported. In order to achieve this, the width between the opposite edges of the pressing surface 34 and / or the position of the clearance hole 28 on the load-receiving member 30 may be set by varying the inclination angle of the L-shaped pressing body 38 depending on the clearance between the outer peripheral surface 58 of the inner tube X1 and the inner peripheral surface 60 of the outer tube X2, while a wedge effect is produced by varying the inclination angle of the L-shaped pressing body 38. Alternatively, the width between the opposite edges of the pressing surface 34 and / or the position of the clearance hole on the load-receiving member 30 may be set so that a clearance is formed between one flat portion 41A on the load-receiving member 30 side of the pressing member 36 and the inner peripheral surface of the first through hole 16, causing the other end 33 of the load-receiving member 30 to incline toward the outer peripheral surfaces of the inner and outer tubes, and the other flat portion 41B to come into contact with the inner peripheral edge of the first through hole 16, thereby increasing the pressing force at the edge of one flat portion 41A of the pressing surface 34 against the outer peripheral surface 58 of the inner tube X1 according to the principle of leverage.

[0051] The pressing surface 34 is formed as a curved surface that conforms to the outer peripheral surface 58 of the inner tube X1, and more specifically, it is preferable that the radius of curvature be set to be the same as the circular outer peripheral surface 58, but in some cases it may not be set to be the same as the radius of curvature of the circular outer peripheral surface 58. More specifically, the pressing surface 34 may be set to have a radius of curvature slightly smaller than the circular outer peripheral surface 58, so that the entire pressing surface 34 does not abut against the outer peripheral surface 58 of the inner tube X1, and both circumferential edge sides of the pressing surface 34 of the inner and outer tubes X1, X2 abut against the outer peripheral surface 58 of the inner tube X1, with a gap being left between the both edges of the pressing surface 34 and the outer peripheral surface 58 of the inner tube X1. This may cause a wedge effect to be generated intensively on both circumferential edge sides of the inner and outer tubes X1, X2, of one of the longitudinal edge portions of the pressing surface 34. 34, the pressing surface 34 may be configured with two-stage curved surfaces 34A and 34B to enhance the wedge effect. More specifically, by providing the curved surface 34B connected to the edge of one flat surface 41A and the curved surface 34A connected to the edge of the other flat surface 41B, which have different degrees of curvature, the contact surface with the outer circumferential surface 58 of the inner tube X1 shifts from the curved surface 34A to the curved surface 34B as the end 32 on the pressing member 36 side and the opposite end 33 of the load-receiving member 30 of the L-shaped pressing body 38 incline in a direction approaching the outer surface 56 of the tubular sleeve 54, thereby enhancing the wedge effect with the outer circumferential surface 58 of the inner tube X1.

[0052] For example, when multiple musical instruments are performed in front of an audience, such as in a big band, the music stand stands placed in front of each performer are not lightweight, foldable music stand stands, but rather large, heavy music stand stands with a wide tube diameter.By setting a large number of such heavy-looking music stand stands in aligned, rotated positions, it is easy to create a unified appearance. To change the height of the music stand F, all that is required is to loosen the fastening screw portion 48, adjust the fitting position of the inner tube X1 relative to the outer tube X2, and then fasten it again. In particular, when lowering the height of the music stand F, the inner tube X1 will fall under its own weight if the fastening screw portion 48 is loosened with one hand and quickly fastened, so there is no need to support the inner tube X1 with the other hand.

[0053] In short, first, the fitting length of the inner tube X1 relative to the outer tube X2 is adjusted according to the desired height, and then the annular shoulder portion 94 formed at the boundary between the second exterior portion 55 and the first exterior portion 53 of the tubular sleeve 54 is placed on the annular end face EN of the outer tube X2.This allows the tubular sleeve 54 to freely rotate around the longitudinal direction of the inner and outer tubes X1 and X2, so that while holding the inner tube X1 with one hand, it is possible to easily rotate the tubular sleeve 54 to the desired rotation position with the other hand.

[0054] Secondly, by threading the fastening screw portion 48 into the tubular sleeve 54, the pressing surface 34 of the L-shaped pressing body 38 comes into contact with the outer peripheral surface 58 of the inner tube X1, and the outer peripheral surface 58 of the inner tube X1 on the opposite diametric side is pressed against the inner peripheral surface of the second exterior portion 55 of the tubular sleeve 54, thereby fixing the inner tube X1 and the outer tube X2 to the tubular sleeve 54. Therefore, even if there is clearance at the mating portion of the inner and outer tubes X1 and X2, the inner tube X1 and the outer tube X2 are fixed to each other in the longitudinal direction of the tubes, and rotation of the tubular sleeve 54 around the longitudinal direction of the inner and outer tubes X1 and X2 is fixed.

[0055] Furthermore, if the width of the annular shoulder portion 94 formed at the boundary between the second exterior portion 55 and the first exterior portion 53 of the tubular sleeve 54 is set to be large, and multiple types of pressing bodies 38 are prepared, it is possible to apply a versatile tubular sleeve 54 to a music stand having existing inner and outer tubes X1 and X2, and by selecting the type of L-shaped pressing body 38, it is possible to add and attach only the fixing and holding jig having the tubular sleeve 54, the L-shaped pressing body 38, and the fastening screw portion 48, rather than replacing the entire music stand.

[0056] On the other hand, by precisely setting the width of the annular shoulder portion 94 of the tubular sleeve 54 for the existing inner and outer tubes X1, X2 and creating a custom-made tubular sleeve 54 with no clearance where the inner and outer tubes X1, X2 fit together, the fastening screw portion 48 not only causes the L-shaped pressing body 38 to press the inner and outer tubes X1, X2 against the inner surface 57 of the tubular sleeve 54, but also presses the outer surface 58 of the inner tube X1 in line contact against the inner surface 60 of the outer tube X2 on the diametrically opposite side of the pressing surface 34 of the L-shaped pressing body 38 at the fitting portion of the inner and outer tubes X1, X2, so that the inner tube X1 and outer tube X2 can be more firmly fixed to each other in the longitudinal direction of the tubes, which is effective, for example, in stands for supporting heavy objects such as music amplifiers and large musical instruments. Furthermore, by screwing in the fastening screw portion 48, the inner and outer tubes X1, X2 are fixed to each other via the tubular sleeve 54, and the rotation of the inner and outer tubes X1, X2 around the longitudinal direction of the tubular sleeve 54 is fixed. Then, by screwing in the male screw 70 through the clearance hole 68 of the L-shaped presser 38 toward the female screw portion 66 of the tubular sleeve 54, the male screw portion 40 of the fastening screw portion 48 can be completely detached from the female screw portion 22 of the tubular sleeve 54. Even if the L-shaped presser 38 becomes free, the male screw 70 can prevent the L-shaped presser 38 from falling off the tubular sleeve 54. In the case of a medical stand for use with intravenous drips, monitors, lighting, etc., casters 96 are usually provided on the bottom of the inner and outer tubes X1, X2, and the stand is moved to a number of treatment sites. During this movement, the stand vibrates up and down due to unevenness in the floor, so it is highly necessary to firmly fix the mating fixing parts of the inner and outer tubes X1, X2, and it is highly necessary to adjust the direction of the intravenous drips, monitors, and lighting during treatment. For these reasons, the usefulness of the inner and outer tube integrated structure of the present invention is higher than that of a music stand, which is usually transported to a performance site and does not require much adjustment of the height and direction of the music stand, microphone, amplifier, etc. during performance.

[0057] As a modified example, if a tubular sleeve 54 is used, the inner and outer tubes X1 and X2 can be fixed and held even when the inner tube X1 is removed from the outer tube X2. More specifically, the pressing surface 34 of the pressing body 38 is pressed against the outer peripheral surface 58 of the inner tube X1, and there is no need to directly fix and hold the inner and outer tubes X1, X2 through the fitting portions of the inner and outer tubes X1, X2; it is sufficient to indirectly fix and hold the inner and outer tubes X1, X2 via the tubular sleeve 54. Therefore, it is possible to fix and hold the inner and outer tubes X1, X2 in a state where there are no fitting portions of the inner and outer tubes X1, X2, in other words, when the overall lengths of the inner and outer tubes X1, X2 are long.

[0058] According to the inner and outer tube integrated structure 10 having the above configuration, when the inner and outer tubes X1, X2 are fitted together to form an integrated structure, the degree of fixation and retention at the fitting portion becomes an issue depending on the application, such as a music stand such as a music stand, a microphone stand, or a medical stand such as an IV stand, a monitor stand, etc., but a first through hole 16 and a second through hole 18 are provided on the outer peripheral surface near one end of the tubular sleeve 54 or the outer tube X2 on the fitting portion side, and the second through hole 18 has a female screw portion 22 on the inner peripheral surface, and by using the pressing body 38 having an L-shaped side cross section and the fastening screw portion 48, the load receiving member 30 of the pressing body 38 is inserted into the first through hole 16 from the pressing surface 34 at the tip, and by screwing the fastening screw portion 48, the load receiving surface 26 receives a pressing load and the pressing surface 34 presses against the outer peripheral surface 58 of the inner tube X1, and The first through hole 16 is formed in such a manner that the other end 33 of the load-receiving member 30 is inclined toward the outer peripheral surfaces of the inner and outer tubes X1 and X2 due to the formation of a clearance between one flat portion 41A and the first through hole 16, and a wedge effect is generated at the clearance side portion of the pressing surface 34, and the pressing force of the fastening screw portion 48 is increased by the principle of leverage with the portion of the pressing surface 34 opposite to the clearance side as the fulcrum, the load-receiving surface 26 as the force point, and the clearance side portion of the pressing surface 34 as the point of application. The pressing surface 34 is configured to straddle the longitudinal direction of the outer tube X2 passing through the center of the load-receiving member 30, and sets the thickness of the load-receiving member 30 and / or the size of the first through hole 16. Furthermore, the pressing surface 34 is configured to have a shape that, when inserted into the first through hole 16, causes the circumferential expansion of the outer tube X2 and the longitudinal expansion of the outer tube X2 to be within predetermined ranges. Therefore, depending on the application, the inner and outer tubes X1 and X2 can be sufficiently fixed and held by simply tightening the fastening screw portion 48 manually.

[0059] In addition, after the entire 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, not only does the L-shaped pressing body 38 begin to tilt and transition to line contact, but as long as the above-mentioned wedge effect is achieved, the L-shaped pressing body 38 begins to tilt before the pressing surface 34 of the L-shaped pressing body 38 hits the outer peripheral surface 58 of the inner tube X1, and the entire pressing surface 34 of the L-shaped pressing body 38 does not have to be in surface contact. The intersection angle between the load-receiving member 30 of the L-shaped pressing body 38 and the pressing member 36, and / or the orientation of the first through hole 16 and the second through hole 18, which is the female thread portion 22, provided in the tubular sleeve 54 (the inclination with respect to the thickness direction of the tubular sleeve 54) may be set appropriately as long as a so-called wedge effect is achieved by screwing in the fastening screw portion 48.

[0060] A second embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 8 and 9. The second embodiment of the present invention is similar to the first embodiment in that it uses an L-shaped pressing body 38 and a fastening screw portion 48 to fix and hold the inner and outer tubes in place in the vertical direction at the mating portion between the inner and outer tubes, and fastening the fastening screw portion 48 causes the pressing surface 34 of the L-shaped pressing body 38 to press against the outer circumferential surface of the inner tube. However, the second embodiment of the present invention is characterized in that the object supported by the stand in the first embodiment is a lightweight music stand, but in this embodiment it is a heavy object, a speaker S, and accordingly, whereas the first embodiment employs a single L-shaped pressing body 38, this embodiment employs a pair of L-shaped pressing bodies 38. More specifically, as shown in Figures 8 and 9, the pair of L-shaped pressing bodies 38 have the same structure and are arranged at a distance in the longitudinal direction of the inner and outer tubes X1 and X2, sandwiching the second through hole 18, with one having a U-shaped portion at the top extending in the longitudinal direction of the tube and an open portion facing downward toward the through hole, and the other having a U-shaped portion at the bottom extending in the longitudinal direction of the tube and an open portion facing upward toward the through hole. The distance between the first through-hole 16 and the second through-hole 18 may be different between the upper first through-hole 16 and the lower first through-hole 16 . The overall planar shape of the L-shaped pressing body 38 may be any of a long U-shape, a short U-shape, a long V-shape, a short V-shape, a vertically long shape, and a horizontally long shape, and the overall planar shapes of a pair of L-shaped pressing bodies 38 may be different from each other. As in the first embodiment, the tubular sleeve 54 may or may not be used. As described above, in each of the pair of L-shaped pressing bodies 38, the inner and outer tubes X1, X2 can be fixed and held together by the wedge effect and the principle of leverage, as in the first embodiment, and a clamping force can be applied to each of the pair of L-shaped pressing bodies 38 by tightening with the single fastening screw portion 48. The pair of L-shaped pressing bodies 38 do not need to have the same structure; for example, the overall planar shape of one may be a long U-shape and the other a long V-shape, or the overall planar shapes may be the same but the length of one pressing member 36 may be different from the length of the other pressing member 36, thereby making the wedge effect and leverage principle of the pair of L-shaped pressing bodies 38 different from each other.

[0061] As a result, by passing the male thread portion 40 of the fastening screw portion 48 through the clearance holes 28 of the upper L-shaped pressing body 38 and the clearance holes 28 of the lower L-shaped pressing body 38 and tightening it into the female thread portion 22 of the tubular sleeve 54, the pressing surface 34 of the upper L-shaped pressing body 38 is pressed against the outer peripheral surface 50 of the outer tube X2, and the pressing surface 34 of the lower L-shaped pressing body 38 is pressed against the outer peripheral surface 58 of the inner tube X1, and the inner and outer tubes X1 and X2 can be fixed and held together in a manner similar to the first embodiment. Unlike the first embodiment, the two L-shaped pressing bodies 38 can be moved and adjusted independently of each other within the corresponding through slits, but since they can be separated by attaching or detaching the fastening screw portion 48, each L-shaped pressing body 38 is provided with a male screw 70 and a corresponding through hole.

[0062] A third embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are designated by similar reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 10 to 12. The third embodiment of the present invention is similar to the first embodiment in that an L-shaped pressing body 38 and a fastening screw portion 48 are used to vertically fix and hold the inner tube X1 and outer tube X2 at the mating portion of the inner tube X1 and outer tube X2 as a stand for the inner and outer tube integrated structure 10, and the fastening screw portion 48 is fastened to press the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1. However, the third embodiment of the present invention is characterized in that the object supported by the stand is a microphone M in this embodiment, whereas in the first embodiment it is a lightweight music stand. In the first embodiment, in the integrated inner and outer tube structure 10, the music stand is supported at the upper end of the inner tube X1, the length of the fitting portion of the inner and outer tubes X1, X2 is adjusted, and then the height of the music stand is adjusted by using an L-shaped pressing body 38 to firmly fix and hold the inner and outer tubes X1, X2 together, whereas in this embodiment, instead of fixing and holding the inner and outer tubes X1, X2 together, an L-shaped pressing body 38 is used to fix and hold the tubular sleeve 54 fixed diagonally to the upper end of the inner tube X1 and the rod-shaped boomer B that supports the microphone M at its end. More specifically, as shown in Figures 10 to 12, to adjust the height or position of the microphone M, the fitting position of the boomer B relative to the tubular sleeve 54 is adjusted, and then, as in the first embodiment, the fastening screw portion 48 is fastened in such a manner that it is threaded into the second through hole 18, in which the female thread portion 22 of the tubular sleeve 54 is provided, through the clearance hole 28 of the load-receiving member 30 of the L-shaped pressing body 38. This causes the pressing surface 34 of the pressing member 36 of the L-shaped pressing body 38 to be pressed against the outer peripheral surface of the boomer B through the first through hole 16, and the boomer B can be fixedly held relative to the tubular sleeve 54. As a variant, by using an L-shaped pressing body 38 with a long load-receiving member 30 for the existing tubular sleeve 54, the load-receiving member 30 may protrude from the end of the tubular sleeve 54 without providing a first through hole 16 in the tubular sleeve 54, and the pressing surface 34 of the pressing member 36 may be pressed directly against the outer peripheral surface of the boomer B.

[0063] More specifically, the L-shaped pressing body 38 and the fastening screw portion 48 are provided near each end face of the tubular sleeve 54 . The load-receiving member 30 of each L-shaped pressing body 38 protrudes from the end face of the corresponding tubular sleeve 54, and the pressing member 36 faces the outer peripheral surface 50 of the inner tube X1 or outer tube X2 on the inner tube X1 or outer tube X2 side of the corresponding end face of the tubular sleeve 54. As a result, unlike the first embodiment, it is possible to omit the first through hole 16 through which the pressing member 36 passes in the tubular sleeve 54. The length of the load receiving member 30 of each L-shaped pressing body 38 is set so that the corresponding pressing member 36 protrudes from the corresponding end face of the tubular sleeve 54 . In addition, from the viewpoint of convenience when rotating the tubular sleeve 54 to the desired rotation position around the longitudinal direction of the outer tube X2, it is preferable that the pair of L-shaped pressing bodies 38 and the pair of fastening screw portions 48 are set on the same side of the tubular sleeve 54. As a modified example, if the microphone M supported by the boomer B is lightweight, the L-shaped pressing body 38 and the fastening screw portion 48 may be provided near one end face of the tubular sleeve 54 . Furthermore, similar to the first embodiment, the L-shaped pressing body 38 and the fastening screw portion 48 may also be employed in the fitting portion of the inner and outer tubes X1 and X2.

[0064] As described above, when the overall length of the inner tube X1 is short and the height of the microphone M cannot be raised to the desired level, the length of the tubular sleeve 54 provided at the mating portion of the inner and outer tubes X1 and X2 can be set long, and an L-shaped pressing body 38 and a fastening screw portion 48 can be provided near each end of the tubular sleeve 54, from which the first through hole 16 has been omitted.As in the first embodiment, the tubular sleeve 54 can be rotated to the desired rotation position around the longitudinal direction of the outer tube X2 until each fastening screw portion 48 is fastened, and by fastening each fastening screw portion 48, the rotation of the tubular sleeve 54 around the longitudinal direction of the inner and outer tubes X1 and X2 can be fixed, and the pair of L-shaped pressing bodies 38 can hold the inner and outer tubes X1 and X2 fixed to each other.

[0065] On the other hand, if the length of the tubular sleeve 54 is short, the L-shaped pressing body 38 and the fastening screw portion 48 may be provided in a similar manner only at one end of the tubular sleeve 54, or the U-shaped pressing body 38 may be provided so as to straddle the tubular sleeve 54.

[0066] It is also possible to set the fastening screw portions 48 independently for each of the L-shaped pressing bodies 38 of the tubular sleeve 54, with one being the fastening screw portion 48 and the other being the pressing lever 100 (seventh embodiment).

[0067] A fourth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and will not be described again. The following describes in detail the features of this embodiment with reference to FIG. The fourth embodiment of the present invention is similar to the first embodiment in that it uses an L-shaped pressing body 38 and a fastening screw portion 48 to fix and hold the inner and outer tubes X1 and X2 in the vertical direction at the mating portion of the inner tube X1 and the outer tube X2 as a stand for the inner and outer tube integrated structure 10, and fastens the fastening screw portion 48 to press the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1. However, the fourth embodiment of the present invention is characterized in that it uses the pressing body 38 as a filler for the second through hole 18. More specifically, as shown in FIG. 13, a through hole 18 with a female thread portion 22 formed on the inner peripheral surface is provided on the outer peripheral surface near one end of the outer tube X2 on the mating portion side, and the pressing body 38 has a shape that can be inserted into the through hole 18, with a load-receiving surface 26 formed on one end face and a pressing surface 34 against the outer peripheral surface 58 of the inner tube X1 formed on the other end face, and has a length shorter than the depth of the through hole 18, and when the fastening screw portion 48 is screwed in, the tip surface of the male thread portion 40 rotates around the longitudinal direction of the male thread portion 40, while the load-receiving surface 26 receives a pressing load without rotating together with the male thread portion 40, and the pressing body 38 presses the pressing surface 34 against the outer peripheral surface 58 of the inner tube X1 in a tight contact manner through the through hole 18. The flexible pressing body 38 is insertable into the second through-hole 18, and has a hardness that allows the pressing surface 34 to be deformed into a shape that conforms to the outer surface 58 of the inner tube X1 when the fastening screw portion 48 is screwed in, and is made of, for example, tin.

[0068] According to the inner and outer tube integrated structure 10 having the above-mentioned configuration, when the inner and outer tubes X1, X2 are fitted together to form an integrated structure, the degree of fixation and retention at the fitting portion becomes an issue depending on the application, such as a music stand such as a music stand, a microphone M stand, or a medical stand such as an IV stand, a monitor stand, etc., but a through hole 18 having a female screw portion 22 formed on the inner peripheral surface is provided on the outer peripheral surface near one end of the outer tube X2 on the fitting portion side, and has a shape that can be inserted into the through hole 18, one end surface is formed with a load receiving surface 26, and the other end surface is formed with a pressing surface 34 against the outer peripheral surface 58 of the inner tube X1, and a pressing body 38 having a length shorter than the depth of the through hole 18, and a male screw portion 40 that can be screwed into the female screw portion 22 , and a head portion 44 provided at one end 42 of the male thread portion 40, and a fastening screw portion 48 having a push-in surface 46 that can abut against the load-receiving surface 26 formed on the male thread portion 40 side of the head portion 44. By using this, when the fastening screw portion 48 is screwed in, the tip surface of the male thread portion 40 rotates around the longitudinal direction of the male thread portion 40, while the load-receiving surface 26 receives a pressing load without rotating together, and the pressing body 38 presses the pressing surface 34 in a tight contact manner against the outer peripheral surface 58 of the inner tube X1 through the through hole, so that the inner and outer tubes X1 and X2 can be fixed and held with the required fixing and holding force depending on the application, and the inner and outer tubes X1 and X2 can be easily and sufficiently fixed and held by manually tightening the fastening screw portion 48.

[0069] As described above, in the past, in a stand with an integrated inner and outer tube structure 10, when a screw was threaded sideways into the female threaded hole of the matching outer tube X2 and the tip of the screw was fixed to the outer surface 58 of the mating inner tube X1, it was difficult for the tip of the screw to come into close contact with the outer surface 58 of the inner tube X1 as the screw turned, and over time, for example, problems occurred where the music stand slipped off. However, by using the presser body 38 as a filler for the second through hole 18 instead of the L-shaped presser body 38, the second through hole 18 is utilized, so compared to the first embodiment, the first through hole 16 is not necessary, and when the tubular sleeve 54 is used, it is advantageous to use a flexible, lightweight resin.

[0070] A fifth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 14 and 15. The fifth embodiment of the present invention is similar to the first embodiment in that an L-shaped pressing body 38 and a fastening screw portion 48 are used to fix and hold the inner pipe X1 and the outer pipe X2 in the vertical direction at the fitting portion of the inner pipe X1 and the outer pipe X2 as a stand for the inner and outer pipe integrated structure 10, and the fastening screw portion 48 is fastened to press the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner pipe X1. However, the fifth embodiment of the present invention is characterized by the aspect of the L-shaped pressing body 38, and in the first embodiment, The load-receiving member 30 and the pressing member 36 of the L-shaped pressing body 38 are perpendicular to each other, and the clear hole 28 through which the male thread portion 40 of the fastening screw portion 48 passes is provided in the center of the load-receiving member 30. However, in this embodiment, the load-receiving member 30 and the pressing member 36 of the L-shaped pressing body 38 are connected at an obtuse angle, and the clear hole through which the male thread portion 40 of the fastening screw portion 48 passes is provided closer to the end of the load-receiving member 30 opposite the end on the pressing member 36 side. 14 and 15, the first through-hole 16 and the second through-hole 18 are provided parallel to each other and at a predetermined angle relative to the extension direction of the inner and outer tubes X1, X2 or the tubular sleeve 54. The angle of inclination is, for example, 10° or less, which can enhance the wedge effect generated by fastening the fastening thread portion 48, and therefore, even if the tightening force of the fastening thread portion 48 is the same, the inner and outer tubes X1, X2 can be more firmly fixed and held together. In this case, the degree of obtuseness of the intersection angle between the load-receiving member 30 of the L-shaped pressing body 38 and the pressing member 36, and the degree to which the clear hole 28 through which the male thread portion 40 of the fastening screw portion 48 passes should be located closer to the end of the load-receiving member 30 opposite the end on the pressing member 36 side, can be determined depending on the degree to which the wedge effect and / or the principle of leverage are to be enhanced.In some cases, the load-receiving member 30 of the L-shaped pressing body 38 and the pressing member 36 may only be connected at an obtuse angle, or the clear hole 28 through which the male thread portion 40 of the fastening screw portion 48 passes may only be located closer to the end of the load-receiving member 30 opposite the end on the pressing member 36 side. As shown in FIG. 14, the pressing surface 34 of the pressing member 36 is formed on a curved surface that follows the outer peripheral surface 58 of the inner tube X1, as in the first embodiment, until the end 32 on the pressing member 36 side and the end 33 on the opposite side of the load-receiving member 30 of the L-shaped pressing body 38 begin to tilt in a direction approaching the outer surface 56 of the tubular sleeve 54 due to fastening of the fastening screw portion 48. As a modified example, the first through hole 16 and the second through hole 18 may be arranged parallel to each other and at a predetermined angle to the extension direction of the inner and outer tubes X1, X2 or the tubular sleeve 54, and the load-receiving member 30 and the pressing member 36 may be arranged to form an obtuse angle so that the load-receiving member 30 is parallel to the extension direction of the inner and outer tubes X1, X2 or the tubular sleeve 54, and the clearance hole 28 may be arranged closer to the pressing member 36 of the load-receiving member 30. As a further variation, the first through hole 16 may be arranged at a predetermined angle relative to the extension direction of the inner and outer tubes X1, X2 or the tubular sleeve 54, while the second through hole 18 may be set perpendicular to the outer surface 56 of the tubular sleeve 54. The overall planar shape of the pressing surface 34 may be U-shaped, V-shaped, horizontally elongated, or vertically elongated, as in the first embodiment.

[0071] A sixth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 16 and 17. The sixth embodiment of the present invention is similar to the first embodiment in that it uses an L-shaped pressing body 38 and a fastening screw portion 48 to fix and hold the inner tube X1 and outer tube X2 in the vertical direction at the mating portion of the inner and outer tubes 10 as a stand, and fastens the inner tube X1 and outer tube X2 in place by fastening the fastening screw portion 48, thereby pressing the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1. However, the second embodiment of the present invention is characterized in that, while the object supported by the stand in the first embodiment is a lightweight music stand, in this embodiment it is a slender instrument such as a saxophone. Accordingly, while in the first embodiment the tubular sleeve 54 that fixes the inner and outer tubes X1 and X2 together is rotatable in the longitudinal direction of the tubes, in this embodiment the inner and outer tubes X1 and X2 have a rectangular cross section in order to prevent relative rotation between the inner tube X1 and outer tube X2 about the longitudinal direction of the tubes and to protect the instrument from twisting. More specifically, as shown in Figures 16 and 17, the length of the inner and outer tubes X1, X2 of the musical instrument stand are adjusted according to the length of the musical instrument body, and are fixed and held in place. The inner and outer tubes X1, X2 have U-shaped musical instrument support portions SU1, SU2 at the top and bottom, respectively, and the musical instrument body is sandwiched between and supported by the U-shaped musical instrument support portions SU1, SU2. The inner and outer tubes X1, X2 have rectangular cross sections, whereas in the first embodiment, the inner and outer tubes X1, X2 have circular cross sections. Therefore, the outer peripheral surface 58 of the inner tube X1 is pressed and fixed to the inner peripheral surface 60 of the outer tube X2 by vertically line contacting the outer peripheral surface 58 of the inner tube X1 on the side opposite the portion pressed and fixed by the pressing surface 34 against the inner peripheral surface 60 of the outer tube X2, and the outer tube X2 is fixed and held against the inner tube X1 by support at two points. In contrast, in this embodiment, the outer peripheral surface 58 of the inner tube X1 on the side opposite the portion pressed and fixed by the pressing surface 34 is pressed and fixed against the inner peripheral surface 60 of the outer tube X2 in surface contact. In this embodiment, unlike the first to fifth embodiments, the music stand, speaker S, microphone M, etc. are not supported in the longitudinal direction (up and down direction) of the tube, but rather the long and slender instrument is supported by leaning it diagonally against the length-adjusted inner and outer tubes X1 and X2. Therefore, there is little need to employ a pair of L-shaped pressing members 36 as in the second embodiment, and a single L-shaped pressing member 36 is sufficient.

[0072] The seventh embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are designated by similar reference numerals and description thereof will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to FIG. The seventh embodiment of the present invention is similar to the first embodiment in that it uses an L-shaped pressing body 38 to fix and hold the inner and outer tubes X1 and X2 in the vertical direction at the mating portion of the inner tube X1 and the outer tube X2 as a stand for the inner and outer tube integrated structure 10, and presses the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1. However, the seventh embodiment of the present invention is characterized in that, while the first embodiment uses a fastening screw portion 48 to press the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1, this embodiment uses a pressing lever instead of the fastening screw portion 48. More specifically, as shown in FIG. 18, the device has a pressing lever 100 having an annular circumferential surface 108 that rotates around a rotation axis 102 parallel to the load receiving surface 26 while abutting against the load receiving surface 26, and the annular circumferential surface 108 is curved such that the radius from the rotation axis 102 expands from a first radius to a second radius, and the rotation of the pressing lever 100 allows the pressing body 38 to move in the thickness direction within the first through hole 18. By rotating the pressing lever 100 around the rotation axis 102, the pressing body 38 starts pressing toward the outer peripheral surface 58 of the inner tube X1 at a rotation position corresponding to the intermediate radius between the first radius and the second radius, and stops pressing toward the outer peripheral surface 58 of the inner tube X1 at a rotation position corresponding to the second radius, bringing the pressing surface 34 into surface contact with the outer peripheral surface 58 of the inner tube X1, and pressing and fixing the outer peripheral surface 58 of the inner tube X1 on the opposite side of the surface contact portion of the pressing surface 34 with the inner tube X1 against the inner peripheral surface 60 of the outer tube X2. The pressing lever 100 has a pair of rotating parts 109 and a lever part 106 connected to the pair of rotating parts 109. A rotating shaft 102 is supported by offset holes 110 provided in each of the pair of rotating parts 109 spaced apart in the longitudinal direction of the inner and outer tubes X1 and X2, and a screw 112 is inserted into the rotating shaft 102 with the offset hole 28 aligned with the hole 104 and threaded into the female thread part 16 provided on the outer peripheral surface of the tubular sleeve 54. This causes the lever part 106 to press the pressing body 38 against the outer peripheral surface 58 of the inner tube X1 through the second through hole 16 with the annular surface 108 kept in contact with the load receiving surface 26 of the L-shaped pressing body 38 around the rotating shaft 102. When the fastening screw portion 48 is screwed in, the load receiving surface 26 receives a pressing load via the pressing surface 46, and the pressing member 36 penetrates the first through hole 16, and the pressing surface 34 presses against the outer peripheral surface 58 of the inner pipe X1. Due to the formation of a clearance between one flat surface 41 on the first through hole 16 side of the pressing member 36 and the inner peripheral surface of the first through hole 16, the other end side of the load receiving member 30 is inclined toward the inner and outer pipes X1 and X2, and the pressing surface 34 is pressed against the outer peripheral surface 58 of the inner pipe X1. In order to generate a wedge effect at a corner including an edge portion 55 of one of the flat portions 41 of the outer tube X2, the first through hole 16 is provided on the outer peripheral surface 50 of the outer tube X2 so as to straddle the longitudinal direction of the outer tube X2 passing through the center of the female thread portion 22 of the outer tube X2, and the pressing surface 34 is set to a shape such that when inserted into the first through hole 16, the circumferential expansion of the outer tube X2 and the longitudinal expansion of the outer tube X2 each fall within a predetermined range, as in the first embodiment.

[0073] An eighth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 19 and 20. The eighth embodiment of the present invention is similar to the first embodiment in that it uses an L-shaped pressing body 38 to fix and hold the inner and outer tubes X1 and X2 in the vertical direction at the mating portion of the inner tube X1 and the outer tube X2 as a stand for the inner and outer tube integrated structure 10, and presses the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1. However, the feature of the eighth embodiment of the present invention is that, while the first embodiment uses a fastening screw portion 48 to press the pressing surface 34 of the L-shaped pressing body 38 against the outer peripheral surface 58 of the inner tube X1, this embodiment uses a pressing lever instead of the fastening screw portion 48. More specifically, as shown in Figures 19 and 20, in the first embodiment, the pressing surface 34 presses the inner tube X1 against the outer peripheral surface 58 of the inner tube X1, thereby fixing and holding the inner tube X1 without it slipping downward, while the tubular sleeve 54 is placed on the annular shoulder portion 94 of the outer tube X2, and as shown in Figure 3, there is a clearance between the inner tube X1 and the outer tube X2, so that the inner tube X1 and the tubular sleeve 54 can move upward relative to the outer tube X2. In contrast, in this embodiment, the pressing surface 34 presses the inner tube X1 against the outer peripheral surface 58 of the inner tube X1, and the pressing surface 35 presses the inner tube X1 against the outer peripheral surface 50 of the outer tube X2, so that the inner tube X1 and the tubular sleeve 54 cannot move upward relative to the outer tube X2, and the inner and outer tubes X1 and X2 are fixed and held both downward and upward.

[0074] More specifically, as shown in FIG. 19, the U-shaped pressing surface 34 of the first embodiment has a step, and a pressing surface 35 having a lower height from the load-receiving member 30 is provided to separate the pressing surface 34, so that the pressing surface 34 presses against the outer peripheral surface 58 of the inner tube X1, and the pressing surface 35 presses against the outer peripheral surface 50 of the outer tube X2, and the height of the step can be set from this perspective. When the fastening screw portion 48 is screwed in, the load receiving surface 26 receives a pressing load via the pressing surface 46, and the pressing member 36 penetrates the first through hole 16, and the pressing surface 34 presses against the outer peripheral surface 58 of the inner pipe X1. Due to the formation of a clearance between one flat surface 41 on the first through hole 16 side of the pressing member 36 and the inner peripheral surface of the first through hole 16, the other end side of the load receiving member 30 is inclined toward the inner and outer pipes X1 and X2, and the pressing surface 34 is pressed against the outer peripheral surface 58 of the inner pipe X1. In order to generate a wedge effect at a corner including an edge portion 55 of one of the flat portions 41 of the outer tube X2, the first through hole 16 is provided on the outer peripheral surface 50 of the outer tube X2 so as to straddle the longitudinal direction of the outer tube X2 passing through the center of the female thread portion 22 of the outer tube X2, and the pressing surface 34 is set to a shape such that when inserted into the first through hole 16, the circumferential expansion of the outer tube X2 and the longitudinal expansion of the outer tube X2 each fall within a predetermined range, as in the first embodiment. [Example]

[0075] In order to confirm the effects of the present invention, the inventors manufactured a prototype and conducted a limit load test. More specifically, the effect of fixing and holding the inner and outer tubes X1 and X2 in the vertical direction at the mating portion was confirmed using the mode of the pressing body 38 as a parameter. The prototype consisted of a metal inner pipe X1, a metal outer pipe X2 that fits into the inner pipe X1, a metal tubular sleeve 54 that was firmly fixed to the end of the outer pipe X2 and had a female threaded portion 22 and a first through hole 16 that was provided in a predetermined positional relationship with the female threaded portion 22, a metal pressing body 38 with an L-shaped side cross section that had a clearance hole 28, and a fastening screw portion 48 that had a male threaded portion 40 that screwed into the female threaded portion 22 of the outer pipe X2 through the clearance hole 28 of the pressing body 38. The specific test method was to apply a predetermined torque to the fastening screw portion 48 using a hammer wrench, so that the pressing surface 34 of the pressing body 38 was pressed against the outer peripheral surface 58 of the inner pipe X1, and the lower end of the outer pipe X2 was placed on a horizontal test stand to fix the integrated structure of the inner and outer pipes X1 and X2 upright via the tubular sleeve 54. A compressive load was applied from the upper end of the inner pipe X1 in the vertical direction, which is the extension direction of the inner and outer pipes X1 and X2, and the critical compressive load at which the outer pipe X2 began to move relative to the inner pipe X1 was measured. For each of several types of prototypes, the change in limit compressive load was determined using a specified torque as a parameter.

[0076] The test conditions are shown in Figures 29 to 33, and the test results are shown in Figures 21 to 28. In all cases, as the load was applied, a slight compression specific to the material of the prototype occurred, and a limit load was reached at which the prototype could no longer fix and hold the inner and outer tubes X1 and X2 together. After that, the load decreased as the prototype moved, and this test measured the limit load under a specified torque. The test conditions presented include the overall planar shape of the pressing surface 34 projected onto a plane, the contact area of ​​the pressing surface 34, its positional relationship with the female thread portion, the tightening torque value, and the specifications of the L-shaped pressing body 38, the inner and outer tubes X1 and X2, and the tubular sleeve 54. Regarding the test numbers (XYZ) under the test conditions in Figures 29 to 33, X represents the overall planar shape of the pressing surface 34, and is either 0 (U-shaped side cross section), 1 (U-shaped with an L-shaped side cross section), 2 (elongated with an L-shaped side cross section), or 3 (oblique with an L-shaped side cross section), Y represents a variation in the overall planar shape of the pressing surface 34, with lowercase letters a, b, c, etc. representing a tightening torque of 3 Nm, and uppercase letters A, B, C, etc. representing a tightening torque of 5 Nm, and Z represents the positional relationship with respect to the female thread portion 22, and is U (upper) or L (lower). In addition, in 3 (oblique L-shaped side cross section), the overall planar shape of the pressing surface 34 is the same as 1cU and 1cL, and in 3cU and 3dU (Fig. 32), 3cL and 3dL (Fig. 33), in the case of lowercase d, the pressing surface 34 is set to have a radius of curvature slightly smaller than the circular outer peripheral surface 58, so that the entire surface of the pressing surface 34 does not abut against the outer peripheral surface 58 of the inner pipe X1, and both edge sides in the circumferential direction of the pressing surface 34 abut against the outer peripheral surface 58 of the inner pipe X1. In the case of the lowercase letter c, the pressing surface 34 is set to have a radius of curvature slightly larger than the circular outer surface 58, so that the entire surface of the pressing surface 34 does not come into contact with the outer surface 58 of the inner tube X1, and the portion between the two circumferential edges of the pressing surface 34 comes into contact with the outer surface 58 of the inner tube X1, leaving a gap between both edge sides of the pressing surface 34 and the outer surface 58 of the inner tube X1.

[0077] The test results reveal the following: 1. According to Figure 21, when the clamping torque is 3 Nm and the pressing body 38 having a U-shaped side cross section is positioned above the female threaded hole of the fastening screw portion, it has been confirmed that the pressing body 38 having an L-shaped side cross section can more firmly fix the inner and outer tubes X1 and X2 than the pressing body 38 (0a) having a U-shaped side cross section. Comparing 1dU and 1cU, 1bU and 1aU, and 1fU and 1eU, it is found that the longer the length of the U-shaped planar band, the greater the critical load. Comparing 1dU with 1cU, and 1bU with 1aU, it is clear that the greater the distance between the fastening screw portion and the female screw hole, the greater the limit load. 2. According to Figures 22 and 23 (detailed view of displacement up to 0.08 mm in Figure 22), when the U-shaped pressing body 38 is positioned below the female threaded hole of the fastening screw portion with a tightening torque of 5 Nm, it has been confirmed that the L-shaped pressing body 38 can more firmly fix the inner and outer tubes X1 and X2 than the U-shaped pressing body 38. Comparing 1DL with 1CL, and 1BL with 1AL, the longer the length of the U-shaped planar band, the greater the limit load. Comparing 1DL and 1CL, and 1BL and 1AL, the greater the distance between the fastening screw portion and the female screw hole, the greater the limit load. 3. According to FIG. 24, when the tightening torque is 3 Nm and the pressing body 38 having an L-shaped side cross section is positioned above and to the side of the female threaded hole of the fastening screw portion, a comparison of 2dS, 2cS, and 2aU shows that the limit load is greater when the pressing body 38 having an L-shaped side cross section is positioned to the side of the female threaded hole of the fastening screw portion than when it is positioned above. Comparing 1dU and 2aU, the limit load is greater when the overall planar shape is U-shaped and extends circumferentially relative to the female threaded hole of the fastening screw portion than when the overall planar shape is elongated and extends longitudinally relative to the pipe through the center of the female threaded hole of the fastening screw portion. 4. According to Figure 25, when the tightening torque is 5 Nm and the pressing body 38 having an L-shaped side cross section is positioned to the side of the female threaded hole of the fastening screw portion, a comparison between 2FS and 2ES confirmed that the pressing surface 34 having an L-shaped side cross section with a vertically elongated overall planar shape can more firmly fix the inner and outer pipes X1 and X2 than a U-shaped shape. A comparison of 2FS and 1DL shows that the limit load is approximately the same in the case where the pressing body 38 has an L-shaped side cross section, an elongated overall planar shape, and is positioned to the side of the female threaded hole of the fastening screw portion, and in the case where the pressing body 38 has an L-shaped side cross section, an overall U-shaped overall planar shape, and is positioned below the female threaded hole of the fastening screw portion, and there is no difference in the strong fixation and retention of the inner and outer tubes X1, X2. 5. According to Figure 26, when the tightening torque is 3 Nm, the pressing body 38 with a U-shaped side cross section is placed above the female threaded hole of the fastening screw portion, and the pressing body 38 with an L-shaped side cross section is attached at an angle to the tubular sleeve 54, a comparison of 3dU and 3cU shows that the smaller the pressing surface 34, the higher the limit load. A comparison of 3eU and 3bU shows that the smaller the offset hole, the higher the limit load when the female threaded hole is perpendicular to the extension direction of the tubular sleeve 54 (the load-receiving member is parallel to the tubular sleeve 54). 27, when the L-shaped presser body 38 is attached at an angle to the tubular sleeve 54 with a tightening torque of 3 Nm, a comparison of 3aL and 3bL shows that when the L-shaped presser body 38 is positioned below the female threaded hole of the fastening screw portion, the larger the inclination angle (the female threaded hole and the offset hole are parallel), the larger the limit load. A comparison of 3cL and 3dL shows that the smaller the pressing surface 34, the larger the limit load. A comparison of 3bL and 3hL shows that the smaller the pressing surface 34, the larger the limit load when only the offset hole is inclined and the female threaded hole is perpendicular to the extension direction of the tubular sleeve 54 (the load-receiving member is parallel to the tubular sleeve 54). 7. According to Figure 28, when the tightening torque is 3, 2, or 1.6 Nm and the L-shaped presser 38 is attached at an angle to the tubular sleeve 54, a comparison of 3h'L, 3h''L, and 3bL with 3bU shows that the limit load is higher when the L-shaped presser 38 is positioned below the female threaded hole of the fastening screw portion than when it is positioned above it. A comparison of 3h'L (2 Nm), 3h''L (1.6 Nm), and 3bL (3 Nm) shows that the limit load is 3h''L > 3h'L > 3bL, which means that the greater the tightening torque, the greater the limit load is not necessarily.

[0078] First, it was confirmed that differences in the pressing and fixing ability occur due to differences in the wedge effect and the principle of leverage depending on the relative positional relationship of the L-shaped side cross section pressing body 38 with respect to the female thread portion 22 (through hole). Secondly, it was confirmed that in the pressing body 38 having an L-shaped side cross section, there is a difference in pressing and fixing ability when the female thread portion 22 (through hole) and the through hole are parallel to the thickness direction of the tubular sleeve 54 and when they are oblique to the thickness direction of the tubular sleeve 54. Thirdly, it was confirmed that the pressing and fixing ability of the pressing body 38 with an L-shaped side cross section differs depending on the proportion of the pressing body 38 that is arranged in the direction along the longitudinal direction of the pipe passing through the center of the female 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 against the outer surface 58 of the inner tube X1, and that when the wedge effect is strong, it is possible to reduce the occurrence of scratches and recesses on the outer surface 58 of the inner tube X1 made of a soft material. Generally, it was confirmed that the limit load is approximately twice as high when using a pressing body 38 with an L-shaped side cross section as when using a pressing body 38 with a U-shaped side cross section; the longitudinal fixation of the inner tube X1 and the outer tube X2 depends on the frictional force between the inner and outer tubes X1 and X2; in the case of a stand using metal inner and outer tubes X1 and X2, the degree of longitudinal fixation of the inner and outer tubes X1 and X2 varies depending on machining errors such as roundness of the circular cross section of the inner and outer tubes X1 and X2, and surface processing errors such as surface smoothness; however, it was confirmed that the use of a pressing body 38 with an L-shaped side cross section is more able to absorb such fluctuations in the degree of fixation than the use of a pressing body 38 with a U-shaped side cross section; and the limit load does not increase monotonically as the tightening force of the fastening screw portion 48 increases, but rather the limit load varies depending on the magnitude of the tightening force of the fastening screw portion 48.

[0079] Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and changes without departing from the scope of the present invention. For example, in the first to seventh embodiments, the present invention has been described as a completed music stand for a music stand, a microphone M, a speaker S, or a musical instrument. However, the present invention is not limited to such a finished product. For example, in an existing music stand, as long as it is necessary to firmly securely hold the inner and outer tubes X1 and X2 in the vertical direction at the mating portion, for example, when a tubular sleeve 54 having an internal thread 22 on its inner surface that can be threaded onto an external thread 40 on the outer surface of the end of the outer tube X2 is fastened in the longitudinal direction of the tube to fix and hold the mating portion of the inner and outer tubes X1 and X2, only such a tubular sleeve 54 may be replaced with the tubular sleeve 54 of this embodiment. In this case, the internal thread 22 may be provided on the inner surface to allow the tubular sleeve 54 to rotate in the longitudinal direction of the tube, or, as in the first embodiment, an annular shoulder 94 may be provided on the inner surface and placed on the annular end face EN of the outer tube X2 to allow the tubular sleeve 54 to rotate in the longitudinal direction of the tube. For example, in the first to seventh embodiments, the present invention has been described as a music stand for a music stand, a microphone M, a speaker S, or a musical instrument, but is not limited to this. 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 mating portion, casters 96 are provided on the end of the inner tube X1 or the outer tube X2 opposite the mating portion of the inner and outer tubes X1 and X2, making it movable, and the outer tube X2 or the inner tube X1 opposite the mating portion of the inner and outer tubes X1 and X2 can also be used as a medical stand that supports an IV drip, a monitor, or a light, such as an IV drip stand or a monitor stand. For example, in the first embodiment, from the viewpoint of protecting the outer surface 58 of the inner pipe X1, it was explained that the tip of the male thread portion 40 of the fastening screw portion 48 passes through the female thread portion 22 of the outer pipe X2 or the tubular sleeve 54 so as not to come into contact with the outer surface 58 of the inner pipe X1. However, this is not limited to this. When the inner and outer pipes X1 and X2 are made of metal, in addition to the pressing surface 34 of the pressing body 38, the tip of the male thread portion 40 of the fastening screw portion 48 comes into contact with the outer surface 58 of the inner pipe X1, thereby making it possible to more firmly fix the position of the outer pipe X2 relative to the inner pipe X1, and this is effective for supporting a heavy object at a predetermined height by either the inner or outer pipe X1 when the inner and outer pipes X1 and X2 are oriented vertically.

[0080] For example, in the first embodiment, it was described that the fastening screw portion 48 has a male thread portion 40 and a head portion 44 that is gripped with the fingers and rotated, while the female thread portion 22 is provided on the outer peripheral surface 50 of the outer tube X2. However, without being limited to this, the male thread portion 40 may be provided on the outer peripheral surface 50 of the outer tube X2, while the fastening screw portion 48 may be in the form of a nut that screws onto the male thread portion 40. For example, in the first to seventh embodiments, a single pressing body 38 is inserted through the first through-hole 16 to press and fix the outer peripheral surface 58 of the inner tube X1 opposite the surface contact portion of the pressing surface 34 with the inner tube X1 against the inner peripheral surface 57 of the outer tube X2 or the tubular sleeve 54. More specifically, each of the inner tube X1 and the outer tube X2 is cylindrical, and the outer peripheral surface 58 of the inner tube X1 is pressed and fixed against the inner peripheral surface 60 of the outer tube X2 by pressing and fixing the outer peripheral surface 58 of the inner tube X1 opposite the portion pressed and fixed by the pressing surface 34 against the inner peripheral surface 60 of the outer tube X2 in a line contact manner in the vertical direction, and the outer tube X2 is fixed and held against the inner tube X1 by support at two points. However, this is not limited to this, and for example, a pair of pressing bodies 38 may be provided on diametrically opposite sides of the outer tube X2.

[0081] For example, in the fifth embodiment, when the tubular sleeve 54 is used to fix and hold the inner and outer tubes X1 and X2, for the convenience of fastening the fastening thread portion 48, the tubular sleeve 54 is rotated independently to the desired position, and the fastening thread portion 48 is fastened at that position by placing the annular shoulder portion 94 provided on the inner surface of the tubular sleeve 54 on the annular end face EN of the outer tube X2. However, this is not limited to this, and if a male thread portion 40 is originally provided on the outer surface near the upper end of the outer tube X2, a female thread portion 22 that can be threaded with the male thread portion 40 may be provided on the inner surface of the tubular sleeve 54 as an alternative to the annular shoulder portion 94, and this threading may be used to rotate the tubular sleeve 54 to the desired position. For example, in the fifth embodiment, when the inner and outer tubes X1 and X2 are fixed and held using the tubular sleeve 54, the tubular sleeve 54 is independently rotated to a desired position for ease of fastening the fastening thread portion 48, and the annular shoulder portion 94 provided on the inner peripheral surface 92 of the tubular sleeve 54 is placed on the annular end surface EN of the outer tube X2 to fasten the fastening thread portion 48 at that position. However, the present invention is not limited to this, and the outer peripheral surface near the upper end of the outer tube X2 may have a shoulder portion 94 provided on the outer peripheral surface 92 of the tubular sleeve 54. In a conventional stand for an inner and outer pipe integrated structure 10, which uses a tubular sleeve 54 having a male threaded portion 40 and a female threaded portion 22 on its inner surface that can be threaded with the male threaded portion 40 and which fixes and holds the inner and outer pipes X1 and X2 by screwing the tubular sleeve 54 into the outer pipe X2, the tubular sleeve 54 may be replaced with a new tubular sleeve 54 having an annular shoulder portion 94 on its inner surface, and the tubular sleeve 54 may be rotated to the desired position by placing the annular shoulder portion 94 on the annular end face EN of the outer pipe X2.

[0082] For example, in the first to fifth embodiments, the use of a single L-shaped pressing body 38 (first embodiment), the use of a pair of stacked L-shaped pressing bodies 38 (second embodiment), the use of an oblique L-shaped pressing body 38 corresponding to the oblique first through-hole 16 (fifth embodiment), and the use of a cylindrical pressing body 38 inserted into the female thread portion 22 (fourth embodiment) have been described, but the present invention is not limited to this, and a combination of these may be used, that is, when a pair of stacked L-shaped pressing bodies 38 are used, an oblique L-shaped pressing body 38 corresponding to the oblique first through-hole 16, and a cylindrical pressing body 38 inserted into the female thread portion 22 may be used, which is useful when used as a height-adjustable stand to stably support a heavy object. For example, in the first to fifth embodiments, the L-shaped pressing body 38 has been described as having an overall planar shape of the pressing surface 34 that is U-shaped, V-shaped, L-shaped, vertically elongated, or horizontally elongated, and all of which have a constant band-like width. However, the present invention is not limited to this, and the band-like width may vary regularly or irregularly as long as the pressing member 36 of the L-shaped pressing body 38 passes through the first through-hole 16 and the pressing surface 34 can abut against the outer peripheral surface 58 of the inner tube X1. For example, in the first embodiment, the L-shaped pressing body 38 was described as being arranged in an axisymmetric shape with respect to the longitudinal direction of the pipe passing through the center of the female thread portion 22 when the overall planar shape of the pressing surface 34 is U-shaped, but without being limited to this, it may also be arranged in an axisymmetric shape with, for example, one side being short and the other side being long with respect to the longitudinal direction of the pipe passing through the center of the female thread portion 22.

[0083] For example, in the first embodiment, it has been described that the inner and outer tubes X1 and X2 both have a circular, constant cross section, and that the tubular sleeve 54 is placed on the annular end face EN of the outer tube X2, and the tubular sleeve 54 is rotated to a desired angular position about the longitudinal direction of the tube, and the inner and outer tubes X1 and X2 are fixed together while the rotation of the tubular sleeve 54 is fixed by the fastening screw portion 48 via the L-shaped pressing body 38. However, the present invention is not limited to this. For example, the inner tube X1 has a circular, constant cross section, and the outer tube X2 has a circular, constant cross section. 2. In the case where the inner tube X1 has a rectangular shape that can be fitted therein, for example, a square with a constant cross section, the tubular sleeve 54 can be held in one hand, and without placing it on the annular end face EN of the outer tube X2, the tubular sleeve 54, which is concentric with the inner tube X1, can be rotated to the desired angular position around the longitudinal direction of the tube while floating above the inner tube X1 with the circular cross section, and then the tubular sleeve 54 can be placed at that height or on the annular end face EN of the outer tube X2 using the fastening screw portion 48, thereby fixing the rotation of the tubular sleeve 54 and holding the inner and outer tubes X1 and X2 in place. [Brief explanation of the drawings]

[0084] [Figure 1] 1 is an overall perspective view of an inner and outer pipe integrated structure 10 according to a first embodiment of the present invention. [Figure 2] 1 is a partially exploded view of an inner and outer pipe integrated structure 10 according to a first embodiment of the present invention. [Figure 3] 1 is a partial cross-sectional side view taken along a line segment that passes through the center of the female thread portion of the inner and outer pipe integrated structure 10 according to the first embodiment of the present invention and that is in the longitudinal direction of the tubular sleeve. [Figure 4] 1 is a perspective view of a tubular sleeve of an inner and outer pipe integrated structure 10 according to a first embodiment of the present invention. [Figure 5]1 is a perspective view of a pressing body of an inner and outer pipe integrated structure 10 according to a first embodiment of the present invention. [Figure 6] 1 is a perspective view of a fastening thread portion of an inner and outer pipe integrated structure 10 according to a first embodiment of the present invention. [Figure 7] 1 is a conceptual diagram illustrating the principle of operation of the inner and outer pipe integrated structure 10 according to the first embodiment of the present invention. [Figure 8] FIG. 10 is an overall perspective view of an inner and outer pipe integrated structure 10 according to a second embodiment of the present invention. [Figure 9] 10 is a partial cross-sectional side view taken along a line segment passing through the center of the female thread portion of the inner and outer pipe integrated structure 10 according to a second embodiment of the present invention and extending in the longitudinal direction of the tubular sleeve, and is similar to FIG. [Figure 10] FIG. 10 is an overall perspective view of an inner and outer pipe integrated structure 10 according to a third embodiment of the present invention. [Figure 11] 3. FIG. 4 is a partial cross-sectional side view taken along a line segment passing through the center of the female thread portion of the inner and outer pipe integrated structure 10 according to a third embodiment of the present invention and extending in the longitudinal direction of the tubular sleeve, and is similar to FIG. [Figure 12] FIG. 10 is a partially exploded view of an inner and outer pipe integrated structure 10 according to a third embodiment of the present invention. [Figure 13] 10 is a partial cross-sectional side view taken along a line segment passing through the center of the female thread portion of the inner and outer pipe integrated structure 10 according to a fourth embodiment of the present invention and extending in the longitudinal direction of the tubular sleeve, and is a view similar to FIG. [Figure 14] 10 is a partial cross-sectional side view taken along a line segment passing through the center of the female thread portion of the inner and outer pipe integrated structure 10 according to a fifth embodiment of the present invention and extending in the longitudinal direction of the tubular sleeve, and is a view similar to FIG. [Figure 15] FIG. 10 is a perspective view of a pressing body of an inner and outer pipe integrated structure 10 according to a fifth embodiment of the present invention. [Figure 16] FIG. 10 is an overall perspective view of an inner and outer pipe integrated structure 10 according to a sixth embodiment of the present invention. [Figure 17] 10 is a partial cross-sectional side view taken along a line segment passing through the center of the female thread portion of the inner and outer pipe integrated structure 10 according to a sixth embodiment of the present invention and extending in the longitudinal direction of the tubular sleeve, and is a view similar to FIG. [Figure 18]FIG. 10 is a partial exploded view of an inner and outer pipe integrated structure 10 according to a seventh embodiment of the present invention. [Figure 19] FIG. 13 is a perspective view of a pressing body of an inner and outer pipe integrated structure 10 according to an eighth embodiment of the present invention. [Figure 20] 10 is a partial cross-sectional side view taken along a line segment passing through the center of the female thread portion of the inner and outer pipe integrated structure 10 according to the eighth embodiment of the present invention and extending in the longitudinal direction of the tubular sleeve, and is similar to FIG. [Figure 21] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 22] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 23] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 24] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 25] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 26] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 27] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 28] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 29] 1 is a table showing test conditions for a limit support load measurement test. [Figure 30] 1 is a table showing test conditions for a limit support load measurement test. [Figure 31] 1 is a table showing test conditions for a limit support load measurement test. [Figure 32] 1 is a table showing test conditions for a limit support load measurement test. [Figure 33] 1 is a table showing test conditions for a limit support load measurement test. [Figure 34]FIG. 10 is a perspective view of a pressing body of an inner and outer pipe integrated structure according to a modified example of the first embodiment of the present invention. [Figure 35] FIG. 10 is a perspective view of a pressing body of an inner and outer pipe integrated structure 10 according to a modified example of the first embodiment of the present invention. [Explanation of symbols]

[0085] X1 inner tube X2 outer tube C Clearance between the pressing member and the first through hole C1 Clearance between inner and outer pipes L1 Length of pressing member L2 Length of the load-bearing member L3 Longitudinal length of tubular sleeve t1 Thickness of pressing member t2 Thickness of the load-bearing member th Thickness of tubular sleeve Θmax Maximum inclination angle of the pushing body D Head diameter D1 Distance between the fulcrum and the point of application D2 Distance between the fulcrum and the force point D3 Distance between the first through hole and the second through hole 10 Inner and outer pipe integrated structure 12 Fitting part 14 Outer surface 16 First through hole 18 Second through hole 20 Inner surface 22 Female thread 24 Plane section 26 Load-bearing surface 28 Stupid Hole 30 Load-receiving member 32 One end of the load-receiving member 33 Other end of load-receiving member 34 Pressing surface 36 Pressing member 38 Pushing body 40 Male thread 41 Plane part 42 One end of the male thread 44 Head 46 Push-in surface 48 Fastening screw part 50 outer surface of outer tube 52 Hollow part 54 Tubular sleeve 55 Edge 56 Outer surface of tubular sleeve 57 Inner surface of tubular sleeve 58 Outer surface of inner pipe 60 Inner surface of outer tube 62 Circumferential surface of annular projection 64 Projection surface 66 Insertion hole 76 One end of the pressing surface 82 Shank 84 Torus 86 Head 88 Male thread 90 female thread 92 Inner surface of tubular sleeve 94 Circular shoulder 96 Caster 98 Circular Surface 100 Pressing lever

Claims

1. Both are integral structures in which inner and outer pipes extending in the vertical direction are fitted together, a first through hole and a second through hole are provided on an outer peripheral surface of the outer tube near one end on the fitting portion side, and a female thread portion is provided on an inner peripheral surface of the second through hole; a load receiving member having opposing flat surfaces, one of which has a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, having opposing flat surfaces, and having a pressing surface at its tip; and a pressing body having an L-shaped side cross section; a fastening screw portion having a male thread portion that can be threaded into the female thread portion and a head portion provided at one end of the male thread portion, the head portion having a push-in surface that can come into contact with the load-receiving surface formed on the male thread portion side; the pressing member has a length longer than at least a depth of the first through hole, and the clearance hole is provided in the load-receiving member at a position where the male thread portion can be screwed into the female thread portion when the pressing member is inserted into the first through hole, When the fastening screw portion is screwed in, the load-receiving surface receives a pressing load via the pressing surface, and the pressing member penetrates the first through hole, causing the pressing surface to press against the outer peripheral surface of the inner tube, an inner and outer pipe integrated structure, characterized in that the first through hole is arranged on the outer surface of the outer pipe so as to straddle the longitudinal direction of the outer pipe passing through the center of the female thread portion of the outer pipe, so that a clearance is formed between the pressing surface of the pressing member and the inner surface of the first through hole, causing the other end side of the load-receiving member to incline toward the outer surface of the inner and outer pipes, and a wedge effect is generated at a corner including an edge portion of the pressing surface on the side inclined toward the outer surface of the inner and outer pipes, and the pressing surface is set to a shape such that when inserted into the first through hole, the expansion of the outer pipe in the circumferential direction and the expansion of the outer pipe in the longitudinal direction each fall within a predetermined range.

2. Both are integral structures in which inner and outer pipes extending in the vertical direction are fitted together, a first through hole and a second through hole are provided on an outer peripheral surface of the outer tube near one end on the fitting portion side, and a female thread portion is provided on an inner peripheral surface of the second through hole; a load receiving member having opposing flat surfaces, one of which has a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, having opposing flat surfaces, and having a pressing surface at its tip; and a pressing body having an L-shaped side cross section; a fastening screw portion having a male thread portion that can be threaded into the female thread portion and a head portion provided at one end of the male thread portion, the head portion having a push-in surface that can come into contact with the load-receiving surface formed on the male thread portion side; the pressing member has a length longer than at least a depth of the first through hole, and the clearance hole is provided in the load-receiving member at a position where the male thread portion can be screwed into the female thread portion when the pressing member is inserted into the first through hole, When the fastening screw portion is screwed in, the load-receiving surface receives a pressing load via the pressing surface, and the pressing member penetrates the first through hole, causing the pressing surface to press against the outer peripheral surface of the inner tube, an inner and outer pipe integrated structure, characterized in that a width between both end edges of the pressing surface and / or a position of the clearance hole in the load-receiving member is set so that a clearance is formed between the one flat surface of the pressing member on the load-receiving member side and the inner peripheral surface of the first through hole, causing the other end side of the load-receiving member to incline toward the outer peripheral surfaces of the inner and outer pipes and the other flat surface of the pressing member to abut against the inner peripheral edge of the first through hole, thereby increasing the pressing force against the outer peripheral surface of the inner pipe at the edge portion of the one flat surface of the pressing surface by the principle of leverage.

3. Both are integral structures in which inner and outer pipes extending in the vertical direction are fitted together, a first through hole and a second through hole are provided on an outer peripheral surface of the outer tube near one end on the fitting portion side, and a female thread portion is provided on an inner peripheral surface of the second through hole; a load receiving member having opposing flat surfaces, one of which has a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, having opposing flat surfaces, and having a pressing surface at its tip; and a pressing body having an L-shaped side cross section; a fastening screw portion having a male thread portion that can be threaded into the female thread portion and a head portion provided at one end of the male thread portion, the head portion having a push-in surface that can come into contact with the load-receiving surface formed on the male thread portion side; the pressing member has a length longer than at least a depth of the first through hole, and the clearance hole is provided in the load-receiving member at a position where the male thread portion can be screwed into the female thread portion when the pressing member is inserted into the first through hole, When the fastening screw portion is screwed in, the load-receiving surface receives a pressing load via the pressing surface, and the pressing member penetrates the first through hole, causing the pressing surface to press against the outer peripheral surface of the inner tube, and a width between both end edges of the pressing surface and / or a position of the clearance hole in the load-receiving member is set by varying the inclination angle of the L-shaped cross section of the pressing body in accordance with the clearance between the outer peripheral surface of the inner pipe and the inner peripheral surface of the outer pipe, so that a wedge effect is produced at a corner including an edge on the side of the pressing surface that is inclined toward the outer peripheral surfaces of the inner and outer pipes due to the formation of a clearance between the one flat surface of the pressing member on the load-receiving member side and the inner peripheral surface of the first through hole, and the other flat surface of the pressing member comes into contact with the inner peripheral edge of the first through hole, thereby increasing the pressing force of the edge of the pressing surface against the outer peripheral surface of the inner pipe by the principle of leverage.

4. An inner and outer pipe integrated structure as described in any one of claims 1 to 3, wherein a tubular sleeve is provided at the end of the outer pipe on the mating side with the inner pipe, which can be fitted onto the outer peripheral surface of the outer pipe and through the inner hollow portion through which the inner pipe can pass, and the first through hole and the second through hole are provided in the thickness direction from the outer peripheral surface of the tubular sleeve.

5. 4. An integrated inner and outer pipe structure according to claim 1, wherein the pressing body is passed through the first through hole, the pressing surface is brought into surface contact with the outer peripheral surface of the outer pipe, and the outer peripheral surface of the inner pipe opposite the surface contact portion of the pressing surface with the inner pipe is pressed and fixed against the inner peripheral surface of the outer pipe.

6. 6. The integral inner and outer pipe structure according to claim 5, wherein the pressing surface has a hardness sufficient to prevent deformation when pressed against the outer peripheral surface of the inner pipe, and the pressing surface is formed so as to conform to the outer peripheral surface of the inner pipe.

7. 4. An integral structure of inner and outer pipes according to claim 1, wherein the inner and outer pipes are arranged so as to extend in the vertical direction with the inner pipe on top and the outer pipe on the bottom, and the mating portions of the inner and outer pipes both have a circular cross-section.

8. 8. The integral inner and outer pipe structure according to claim 7, wherein the inner pipe and the outer pipe are each cylindrical, and the outer peripheral surface of the inner pipe is pressed and fixed to the inner peripheral surface of the outer pipe by pressing and fixing the outer peripheral surface of the inner pipe opposite the portion pressed and fixed by the pressing surface against the inner peripheral surface of the outer pipe in a line contact manner in the vertical direction, and the outer pipe is fixed and held to the inner pipe by support at two points.

9. 4. The integral structure of claim 1, wherein the load-bearing surface is formed as a peripheral surface of an annular projection around the clearance hole.

10. 4. The integral structure of claim 1, wherein the load-receiving surface is formed as a protruding surface on an end portion of the load-receiving member.

11. 4. The integral structure of claim 1, wherein the load-receiving member and the pressing member are disposed so as to intersect at right angles.

12. 5. The integral inner and outer pipe structure according to claim 4, wherein the offset hole is provided on the other end side of the load-receiving member, and the tubular sleeve is provided with a through hole having a female thread portion on its inner peripheral surface such that a male thread portion can be threaded into the through hole via the offset hole, and the length of the male thread portion is set so that a tip of the male thread portion does not come into contact with the outer peripheral surface of the inner pipe when threaded.

13. 4. An integral inner and outer pipe structure according to claim 1, wherein the overall planar shape of the pressing surface is an inverted U-shape that opens toward the second through hole and is capable of passing through the first through hole, and is provided around the second through hole.

14. 4. An integrated inner and outer pipe structure according to claim 1, wherein the overall planar shape of the pressing surface is an inverted V-shape that opens toward the second through hole and can pass through the first through hole, and is arranged around the second through hole.

15. 4. An integral inner and outer pipe structure according to claim 1, wherein the overall planar shape of the pressing surface is L-shaped so as to be able to pass through the first through hole and is provided around the second through hole.

16. 4. An integrated inner and outer pipe structure according to claim 1, wherein the overall planar shape of the pressing surface is a horizontally elongated shape that crosses the longitudinal direction of a pipe that can pass through the center of the second through hole and that can be inserted into the first through hole.

17. 4. The integral structure of claim 1, wherein the pressing member has a constant cross section in the longitudinal direction, and a tip end surface of the pressing member forms the pressing surface.

18. An integrated inner and outer pipe structure as described in Claim 13, wherein each of the inverted U-shaped pressing surfaces is arranged in an axisymmetrical shape with respect to the longitudinal direction of the inner and outer pipes passing through the center of the female thread portion.

19. 19. The integral structure of claim 18, wherein the pressing surface having the inverted U shape is arranged concentrically with the second through hole.

20. 3. The integral structure of inner and outer pipes according to claim 1, wherein the first through hole and the second through hole are provided parallel to each other and obliquely at a predetermined angle with respect to the extending direction of the inner and outer pipes.

21. An inner and outer pipe integrated structure as described in any one of claims 1 to 3, wherein the first through hole is arranged at a predetermined angle with respect to the extension direction of the inner and outer pipes, while the second through hole is set perpendicular to the outer peripheral surface of the outer pipe.

22. The fastening screw portion has a shank portion and the male thread portion extending downward from a lower surface of the shank portion, 4. The integral inner and outer pipe structure according to claim 1, wherein an annular surface surrounding the male thread portion is formed on the lower surface, and the male thread portion is screwed into the female thread portion through the clearance hole, whereby the lower surface of the shank portion and the load-receiving surface of the pressing body come into contact with each other, and the fastening screw portion and the pressing body are integrally pressed and fixed to the inner pipe and screwed and fixed to the outer pipe.

23. 23. The integral structure of claim 22, wherein the fastening screw portion has a head portion that can be held and rotated by fingers at an end of the shank portion opposite to the end of the male thread portion.

24. 5. The integral structure of claim 4, wherein the fastening screw portion prevents rotation of the inner and outer tubes of the tubular sleeve about the longitudinal direction of the inner and outer tubes, while fixing and holding the inner and outer tubes in a predetermined fitted position.

25. An inner and outer pipe integrated structure as described in claim 4, wherein the longitudinal length of the tubular sleeve and / or the length of the load-receiving member are set so that the tip of the male thread portion of the fastening screw portion directly presses against the outer peripheral surface of the outer pipe.

26. 4. The integral inner and outer pipe structure according to claim 1, wherein a maximum inclination angle of the other end of the load-receiving member of the pressing body in a direction approaching the outer peripheral surface of the outer pipe due to fastening of the fastening screw portion is set by a thickness of the outer pipe and / or a clearance between the outer peripheral surface of the inner pipe and the inner peripheral surface of the outer pipe and / or a clearance between the pressing surface and the first through hole.

27. 5. An integrated inner and outer pipe structure as described in claim 4, wherein a male thread is provided on the side peripheral surface of the one end side of the outer pipe, and a female thread that can be threaded onto the male thread is provided on the inner peripheral surface of the tubular sleeve.

28. 4. The integral structure of an inner and outer pipe according to claim 1, wherein the load-receiving member and the pressing member are arranged to form an obtuse angle, and the clearance hole is formed near the other end of the load-receiving member.

29. 5. The integral inner and outer pipe structure according to claim 4, wherein an annular shoulder portion is formed on the inner peripheral surface of the tubular sleeve, the width of the annular shoulder portion being large enough to be placed on the annular end surface of the outer pipe, and the tubular sleeve being rotatable about its longitudinal axis.

30. 4. The integral structure of claim 1, wherein the inner and outer tubes are a stand for music, which supports a music stand, a musical instrument, a speaker, or an amplifier at the end of the inner tube or the outer tube opposite the fitting portion of the inner and outer tubes.

31. 4. An integrated structure of inner and outer tubes as described in any one of claims 1 to 3, which is a medical stand that is movable by having casters provided at the end of the inner tube or the outer tube opposite the fitting portion of the inner and outer tubes, and that supports either an intravenous drip, a monitor, or lighting by the end of the outer tube or the inner tube opposite the fitting portion of the inner and outer tubes.

32. 24. An integral structure of inner and outer pipes as described in claim 23, wherein the diameter of the head portion and the diameter and / or pitch of the male thread portion are set so that the inner and outer pipes are sufficiently fixed and held by manually tightening the fastening screw portion.

33. 4. The integral structure of inner and outer pipes according to claim 2 or 3, wherein the increase in the clamping force by the fastening screw portion based on the principle of leverage is achieved by setting a ratio of a clearance between the other flat surface portion of the pressing member and a center of the clearance hole to a distance between the other flat surface portion of the pressing member and a center of the second through hole.

34. Both are integral structures in which an inner pipe and an outer pipe extending in the vertical direction are fitted together, a first through hole and a second through hole are provided in a thickness direction on an outer peripheral surface of the outer tube near one end on the fitting portion side, and a female thread portion is provided on an inner peripheral surface of the second through hole; a load receiving member having opposing flat surfaces, one of which has a load receiving surface, and a clearance hole penetrating in the thickness direction between the opposing flat surfaces; and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface, having opposing flat surfaces, and having a pressing surface at its tip, and having an L-shaped cross section; the pressing member has at least a length longer than a depth of the first through hole, and the clearance hole is provided in the load-receiving member at a position where a male thread portion can be screwed into the female thread portion when the pressing member is inserted into the first through hole, The load bearing member further includes a pressing lever having an annular peripheral surface that rotates around an axis parallel to the load bearing surface while contacting the load bearing surface, the annular circumferential surface is curved such that the radius from the axis increases from a first radius to a second radius, and the pressing body is movable within the first through hole in a thickness direction of the first through hole by rotation of the pressing lever; By rotating the pressing lever around an axis provided at a predetermined height from the outer peripheral surface of the outer tube, the pressing body starts pressing against the outer peripheral surface of the inner tube at a rotation position corresponding to an intermediate radius between the first radius and the second radius, and finishes pressing against the outer peripheral surface of the inner tube at a rotation position corresponding to the second radius, so that the pressing surface comes into surface contact with the outer peripheral surface of the inner tube, and the outer peripheral surface of the inner tube opposite to the surface contact portion of the pressing surface with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube, When the pressing member penetrates the first through hole while the load-receiving surface receives a pressing load via the pressing surface due to the rotation of the pressing lever, and the pressing surface presses against the outer peripheral surface of the inner tube, a clearance is formed between the one flat surface portion of the pressing member on the first through hole side and the inner peripheral surface of the first through hole, so that the other end side of the load-receiving member is inclined to approach the outer peripheral surfaces of the inner and outer tubes, and a wedge effect is generated at a corner including an edge of the one flat surface portion of the pressing surface against the outer peripheral surface of the inner tube. The first through hole is provided on the outer peripheral surface of the outer tube so as to straddle the longitudinal direction of the outer tube passing through the center of the female thread portion of the outer tube, and the pressing surface is set to a shape such that, when inserted into the first through hole, the expansion in the circumferential direction of the outer tube and the expansion in the longitudinal direction of the outer tube each fall within a predetermined range. An integrated inner and outer pipe structure.

35. a step of preparing a pressing body having an L-shaped cross section, the pressing body including a load receiving member having a load receiving surface and a clearance hole, and a pressing member extending from one end of the load receiving member toward the opposite side of the load receiving surface and having a pressing surface at its tip, a tubular sleeve having a first through hole and a second through hole on its outer circumferential surface, the second through hole having a female thread portion on its inner circumferential surface, and a fastening screw portion having a male thread portion that can be screwed into the female thread portion and having a pressing surface that can abut against the load receiving surface; a step of fitting a tubular sleeve having a circular inner cross section onto an upper end of the outer tube; inserting an inner tube into the tubular sleeve or outer tube; rotating the tubular sleeve about the longitudinal axis of the outer tube to a desired rotational position; and fastening the fastening screw portion to press the pressing surface from the outside of the tubular sleeve toward the outer peripheral surface of the inner tube in the thickness direction of the tubular sleeve, thereby fixing the tubular sleeve at a desired rotational position around the longitudinal direction of the outer tube, and pressing the outer peripheral surface of the opposite side of the inner tube against the inner peripheral surface of the tubular sleeve or the outer tube, thereby fixing and holding the inner and outer tubes together in the longitudinal direction, the step of fixing and holding includes a step of forming a clearance between one flat surface of the pressing member on the side of the first through hole and the inner peripheral surface of the second through hole, so that the other end side of the load receiving member is inclined so as to approach the outer peripheral surfaces of the inner and outer tubes, and generating a wedge effect on the outer peripheral surface of the inner tube at a corner including an edge portion of the pressing surface close to the load receiving member, A method for fixing and holding an inner and outer tube, comprising:

36. 36. A method for fixing and holding inner and outer tubes as described in claim 35, further comprising a step of pressing the tubular sleeve from the outside toward the outer surface of the outer tube in the thickness direction of the tubular sleeve to fix the tubular sleeve in a desired rotational position around the longitudinal direction of the outer tube, while pressing the outer surface of the opposite side of the outer tube against the inner surface of the tubular sleeve, thereby fixing and holding the inner and outer tubes together in the longitudinal direction.

37. an inner peripheral surface of the tubular sleeve having 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, and an annular shoulder portion is formed at a connecting portion between the reduced diameter portion and the expanded diameter portion; 37. The method for fixing and holding the inner and outer tubes according to claim 36, wherein the annular shoulder is placed on the annular upper end surface of the outer tube, and the tubular sleeve is rotated to a desired rotational position around the longitudinal direction of the outer tube.

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