Fixed support jig and method for fixedly supporting inner and outer tubes

Abstract

Provided is a fixed support jig (10) having a tubular base portion (12) which is interposed between an inner tube (X1) and an outer tube (X2) that fit with each other and which is provided with through holes (32) in the outer circumferential surface thereof. The tubular base portion is formed from a first outer-fitting portion that fits around the outside of the outer tube such that an inner circumferential surface of the first outer-fitting portion faces the outer circumferential surface of the outer tube with a first prescribed clearance, and a second outer-fitting portion that fits around the outside of the inner tube such that an inner circumferential surface of the second outer-fitting portion faces the outer circumferential surface of the inner tube with a second prescribed clearance. The fixed support jig also has a pressing-load receiving portion (25), a pressing body (14) provided with a pressing end surface that can press against the outer circumferential surface of the inner tube, and a pressing-load applying portion (16) that applies a pressing load to the pressing-load receiving portion. After having adjusted the fitting position of the inner tube with respect to the outer tube, the pressing-load applying portion presses, via a pressing-load receiving surface, the pressing body against the inner tube through the through holes in the tubular base portion that has been set at a desired rotation position around the longitudinal direction of the inner and outer tubes, thereby bringing the pressing end surface into surface contact with the outer circumferential surface of the inner tube. Meanwhile, the outer circumferential surface of the inner tube on the opposite side from the surface contact portion where the pressing end surface meets the inner tube is pressed and fixed against the inner circumferential surface of the outer tube or the inner circumferential surface of the tubular base portion.

Description

Fixing support jig and method for fixing and supporting inner and outer pipes

[0001] The present invention relates to a fixing support jig and a method for fixing and supporting inner and outer tubes, and more particularly to a fixing support jig and a method for fixing and supporting inner and outer tubes that are applied to music stands and have a simple structure to improve usability when adjusting the stand height.

[0002] The inventor of the present application has proposed in Patent Document 1 a length adjusting jig that has a simple structure and can be easily operated to adjust the overall length of the inner tube and the outer tube.

[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 to each other, and has a pair of through slits spaced apart on the outer surface of the outer tube, a female threaded portion between the pair of through slits, a pressing portion that is positioned on the outer surface of the outer tube and passes through the pair of through slits to contact the outer surface of the inner tube, and a tightening screw portion that can press and fix the pressing portion against the outer surface of the inner tube, and the tightening screw portion has a male threaded portion that can be threaded into the female threaded portion, and has an opening that faces the inner surface of the outer tube after adjusting the fitting position of the inner tube relative to the outer tube, and is configured so that without providing a pressing portion storage space that protrudes outside the outer tube, the male threaded portion is threaded into the female threaded portion by the tightening screw portion, and the pressing portion is passed through the pair of through slits to press and fix against the outer surface of the inner tube.

[0004] According to the length adjusting jig having the above-mentioned configuration, the length of the mating portion of the inner and outer tubes that are fitted together is adjusted by the female screw portion provided on the outer surface of each outer tube, at least one through hole within a predetermined range from the female screw 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 fastening screw portion that can press and fix the pressing portion against the outer peripheral surface of the inner tube.By shaping the tip surface of the pressing portion to fit along the outer peripheral surface of the inner tube so that it can come into surface contact with the outer peripheral surface of the inner tube, the mating position of the inner tube with respect to the outer tube is adjusted, and then, without providing a pressing portion storage space that has an opening facing the inner peripheral surface of the outer tube and protrudes outside the outer tube, the male screw portion is screwed into the female screw portion provided on the outer peripheral surface of the outer tube by rotating the fastening screw portion, and the pressing portion within a predetermined range from the female screw portion is screwed in by screwing in the fastening screw portion. The through hole can be passed through and the tip surface can be pressed and fixed in a surface contact manner against the outer peripheral surface of the inner tube, and the simple structure does not require excessive tightening force and can be adjusted with a simple operation so that the overall length of the inner tube and outer tube can be fixed and held in place.

[0005] However, when such length adjustment jigs are applied to music stands, such as music stands, microphones, and amplifiers, the following technical problems arise. Specifically, if the fastening screw is on the left side, it is necessary to turn the fastening screw in the opposite direction with the fingers of the left hand, which is inconvenient for right-handed users. However, it is also laborious and inconvenient to lift a heavy music stand, microphone, or amplifier stand and rotate the tube around its longitudinal axis to change the left-side fastening screw to the right-side. A performer may need to adjust the height of the music stand by switching instruments during a performance, so a simple height adjustment using the fastening screw is desirable. Furthermore, in orchestral or big band performances with multiple performers, it is more aesthetically pleasing to the audience if the fastening screws of each performer are aligned, but it is inconvenient to lift a heavy music stand, microphone, or amplifier stand and adjust the orientation of the fastening screw around the longitudinal axis of the stand. The above problems also exist in medical stands that are equipped with casters at the end of the inner or outer tube opposite the fitting portion of the inner and outer tubes, making them movable, and that support an IV drip, monitor, or lighting on the end of the outer or inner tube opposite the fitting portion of the inner and outer tubes.

[0006] Patent No. 7369944

[0007] In view of the above technical problems, it is an object of the present invention to provide a fixing support jig and a method for fixing and supporting inner and outer tubes that are applicable to music stands and medical stands, and that have a simple structure and improved usability when adjusting the stand height.In view of the above technical problems, it is an object of the present invention to provide a fixing support jig and a method for fixing and supporting inner and outer tubes that are applicable to music stands and medical stands that have existing inner and outer tube fitting structures, and that have a simple structure and improved usability when adjusting the stand height, while firmly fixing and holding the inner and outer tubes.

[0008] In order to achieve the above object, the fixing support jig of the present invention is a fixing support jig that is interposed between an inner pipe and an outer pipe, at least one of which has a circular cross section, both of which extend in the vertical direction and fit together, and that fixes and supports a heavy object at a predetermined height, and has a tubular base portion that is provided with a through hole on its outer peripheral surface and can be fitted onto the outer peripheral surface of one end of the outer pipe, and the tubular base portion is made up of a first outer fitting portion that extends from the one end toward the outer pipe and fits onto the outer pipe, with its inner peripheral surface facing the outer peripheral surface of the outer pipe with a first predetermined clearance, and a second outer fitting portion that extends from the one end toward the inner pipe and fits onto the inner pipe, with its inner peripheral surface facing the outer peripheral surface of the inner pipe with a second predetermined clearance, and further has a pressing load receiving portion that has a pressing load receiving surface, and a pressing body that has a pressing end surface that can be pressed against the outer peripheral surface of the inner pipe, and a pressing load applying portion that applies a pressing load to the pressing load receiving portion, When a heavy object is supported by either the inner or outer tube, the fitting position of the inner tube relative to the outer tube is adjusted according to the predetermined height of the heavy object, and then the pressing load applying portion presses the pressing body toward the inner tube via the pressing load receiving surface through the through hole of the tubular base portion which is set at the desired rotational position centered on the longitudinal direction of the inner and outer tubes, thereby bringing the pressing end face into surface contact with the outer peripheral surface of the inner tube, and pressing and fixing the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing end face with the inner tube against the inner peripheral surface of the outer tube or the inner peripheral surface of the tubular base.

[0009] In order to achieve the above object, the present invention provides a fixing support jig that is interposed between an inner pipe and an outer pipe, at least one of which has a circular cross section, both of which extend in the vertical direction and are fitted together, and that fixes and supports a heavy object at a predetermined height, and that comprises: a tubular base portion that is attached and fixed to the outer peripheral surface of one end of the outer pipe, and that has a female thread portion and a pair of through holes sandwiched between the female thread portion on its outer peripheral surface; the tubular base portion is made up of a first outer fitting portion that extends from the one end toward the outer pipe and that fits around the outer pipe, with its inner peripheral surface facing the outer peripheral surface of the outer pipe with a first predetermined clearance, and a second outer fitting portion that extends from the one end toward the inner pipe and that fits around the inner pipe, with its inner peripheral surface facing the outer peripheral surface of the inner pipe with a second predetermined clearance, one of the pair of through holes being provided in the first outer fitting portion and the other of the pair of through holes being provided in the second outer fitting portion, The device further comprises a pressing body having a pressing load receiving portion having a generally U-shaped vertical cross section and having a pressing load receiving surface with a clearance hole provided therein, and a pair of legs spaced apart from each other in the extension direction of the pressing load receiving portion; and a fastening screw portion that can be pressed and fixed to the pressing load receiving portion and has a male screw portion that can be screwed into the female screw portion, one of the pair of legs having a pressing end surface that can be pressed against the outer circumferential surface of the inner tube, and the other having a pressing end surface that can be pressed against the outer circumferential surface of the outer tube, When a heavy object is supported by either the inner or outer tube, the fitting position of the inner tube relative to the outer tube is adjusted according to the predetermined height of the heavy object, and then the clamping screw portion is passed through the clearance hole and the male threaded portion is screwed into the female threaded portion, while one of the pair of legs is passed through the through hole of the first outer fitting portion so that the corresponding pressing end face comes into surface contact with the outer peripheral surface of the inner tube, and the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing end face with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube or the tubular base portion, and the other of the pair of legs is passed through the through hole of the second outer fitting portion so that the corresponding pressing end face comes into surface contact with the outer peripheral surface of the outer tube, and pressed and fixed.

[0010] According to the fixing support jig having the above-mentioned configuration, in the inner tube and outer tube that both extend in the vertical direction and are fitted together, a tubular base portion having a pair of through holes on its outer peripheral surface is attached to the outer peripheral surface of one end of the outer tube, sandwiching a female thread portion therebetween, and one leg portion of a pair of pressing bodies having a substantially U-shaped vertical cross section is inserted through one of the through holes provided in a first external fitting portion that extends from one end of the outer tube toward the outer tube and is fitted onto the inner tube with an inner peripheral surface facing the outer peripheral surface of the inner tube with a first predetermined clearance, and The leg portion of the outer tube extends from one end of the outer tube toward the inner tube, and the inner peripheral surface of the second external fitting portion is fitted onto the outer tube with a second predetermined clearance, and the male threaded portion of the fastening screw portion is screwed into the female threaded portion, thereby making it possible to press the pair of pressing bodies against the pressing load receiving portions of the pressing body. When a heavy object is to be supported by either the inner or outer tube, the fitting position of the inner tube relative to the outer tube is adjusted according to the predetermined height of the heavy object, and then the fastening screw portion is fastened to the load receiving portion. the other of the pair of legs is inserted through the through hole of the second outer fitting portion so that the corresponding pressing end face is in surface contact with the outer peripheral surface of the outer tube, thereby pressing and fixing the outer peripheral surface of the inner tube on the side opposite to the surface-contacting portion of the pressing end face against the inner peripheral surface of the outer tube or the tubular base portion, and the other of the pair of legs is inserted through the through hole of the second outer fitting portion so that the corresponding pressing end face is in surface contact with the outer peripheral surface of the outer tube, thereby pressing and fixing the outer peripheral surface of the outer tube. Until being screwed in by the fastening screw portion, the tubular base portion attached to the outer peripheral surface of one end of the outer tube is free to rotate about the longitudinal direction of the inner and outer tubes, and screwing in by the fastening screw portion fixes such rotation of the tubular base portion and enables the inner and outer tubes to be fixed and held in place in the longitudinal direction of the inner and outer tubes. When such a fixing support jig is applied to a music stand or a medical stand, the simple structure makes it possible to improve usability when adjusting the stand height.

[0011] Furthermore, when a male thread is provided on the one end of the outer tube, a female thread that can be threaded onto the male thread may be provided on the inner peripheral surface of the tubular base. Furthermore, it is preferable that the other pressing end surface has a complementary shape so as to fit closely to the threaded portion of the outer tube. Furthermore, it is preferable that each end of the pressing load receiving portion has a leg portion extending in the opposite direction from the pressing load receiving surface, the leg portion has the pressing end surface at its tip, and the length from the pressing load receiving surface of each leg portion to the pressing end surface is set in accordance with a first predetermined clearance and a second predetermined clearance.

[0012] In addition, it is preferable that the other of the pair of pressing bodies is inserted through the through hole of the second outer fitting portion, and the corresponding pressing end surface is brought into surface contact with the outer peripheral surface of the outer tube, while the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing end surface with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube or the tubular base portion. It is also preferable that the lengths of each leg portion be set so that the pressing end surfaces simultaneously contact each outer peripheral surface when the fastening screws are tightened. It is also preferable that the diameter of the second outer fitting portion be set smaller than the diameter of the first outer fitting portion, and that an annular shoulder portion be formed at the connection portion between the first outer fitting portion and the second outer fitting portion, and that the annular shoulder portion be placed on one peripheral end of the outer tube. It is also preferable that the pressing end surface has a hardness sufficient to prevent deformation when pressed against the outer peripheral surface of the inner tube, and that the pressing end surface be formed to conform to the outer peripheral surface of the inner tube.

[0013]

[0010] Preferably, 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 on the opposite side of the pressing and fixing portion by the pressing end face 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 supported to the inner pipe by support at three points. Furthermore, preferably, the fastening screw portion has a shank portion and the male thread portion extending downward from the underside of the shank portion, and the underside forms an annular surface surrounding the male thread portion, and by threading the male thread portion into the female thread portion through the clear hole, the underside of the shank portion comes into contact with the pressing load receiving surface of the pressing body, so that the fastening screw portion and the pressing body are pressed and fixed to the inner pipe and screwed into the outer pipe as a single unit.

[0014] Furthermore, the clamping screw portion preferably has a head portion at the end of the shank portion opposite the end of the male thread portion that can be gripped with fingers and rotated. Additionally, the fixing support jig is preferably made of metal, and the pair of through holes are preferably spaced a predetermined distance apart in the longitudinal direction of the inner and outer tubes and extend circumferentially of the inner and outer tubes, respectively, so that a heavy object can be supported at a predetermined height by either the inner or outer tube. Furthermore, the difference in length between one of the leg portions and the other leg portion preferably is set depending on the thickness of the outer tube and the difference between the first predetermined clearance and the second predetermined clearance. Furthermore, by tightening the fastening screw, the inner and outer tubes can be fixed and held in a predetermined mating position while preventing rotation of the tubular base.

[0015] Furthermore, the presser body near the end of the fitting portion between the outer tube and the inner tube has an insertion hole formed in the thickness direction of the presser body from the side closest to the end of the outer tube, of a pair of opposing side surfaces constituting the presser body, and a slender hole with a circular cross section is formed in the end surface of the outer tube on the fitting portion side, having a circular opening on the end surface and extending all the way to the side surface closest to the end of the outer tube, and further has an insertion rod insertable from the circular opening into the slender hole, and by inserting the pair of presser bodies into the pair of through holes, the slender hole communicates with the insertion hole, and by inserting the tip end of the insertion rod into the insertion hole, the pair of presser bodies are held in the pair of through holes, the slender hole has a female screw portion, and the insertion rod is a set screw that can be screwed into the female screw portion of the slender hole, and the tip end of the set screw threads into the slender hole while screwing into the slender hole. Preferably, the pair of pressing bodies are detachably held within the pair of through holes by being inserted into the through holes.

[0016] In order to achieve the above object, the music stand of the present invention additionally has a fixed support jig as described in claim 1 or claim 2, and is configured to support a music stand, musical instrument, microphone or amplifier by the end of the inner tube or the outer tube opposite the fitting portion of the inner and outer tubes.

[0017] In order to achieve the above object, the medical stand of the present invention has a fixing support jig as described in claim 1 or claim 2, and is provided with casters at the end of the inner tube or the outer tube opposite the fitting portion of the inner and outer tube, making it movable, and is configured to support an IV drip, a monitor, and lighting by the end of the outer tube or the inner tube opposite the fitting portion of the inner and outer tube.

[0018] In order to achieve the above object, the method for fixing and supporting inner and outer tubes of the present invention comprises the steps of: fitting a tubular base having an inner circumferential surface with a circular cross section onto the upper end of the outer tube; fitting the inner tube into the tubular base or the outer tube; rotating the tubular base to a desired rotational position around the longitudinal direction of the outer tube; and pressing the tubular base from the outside toward the outer circumferential surface of the inner tube in the thickness direction of the tubular base, thereby fixing the tubular base at the desired rotational position around the longitudinal direction of the outer tube, while pressing the outer circumferential surface of the opposite side of the inner tube against the inner circumferential surface of the tubular base or the outer tube, thereby fixing and holding the inner and outer tubes together in the longitudinal direction.

[0019] Preferably, the method further includes a step of pressing the tubular base from the outside toward the outer surface of the outer tube in the thickness direction of the tubular base to fix the tubular base at a desired rotational position about 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 base to fix and hold the inner and outer tubes together in the longitudinal direction. The inner surface of the tubular base may be provided with a reduced diameter portion larger than the diameter of the inner tube and an expanded diameter portion larger than the diameter of the outer tube, and an annular shoulder portion may be formed at a connection between the reduced diameter portion and the expanded diameter portion, and the annular shoulder portion may be placed on the annular upper end surface of the outer tube to rotate the tubular base at the desired rotational position about the longitudinal direction of the outer tube.

[0020] A first embodiment of a fixing support jig 10 of the present invention will be described in detail below with reference to the drawings. As shown in Figures 1 to 8, the fixing support jig 10 fixes and supports an inner pipe X1 and an outer pipe X2 that fit together in the pipe longitudinal direction. It is generally composed of a tubular base portion 12 attached and fixed to the outer peripheral surface of one end of the outer pipe X2, a presser 14 interposed between the inner pipe X1 and the outer pipe X2 and having a pressing end surface 20 that can be pressed against the outer peripheral surface 13 of the inner pipe X1, and a fastening screw portion 16 that can press and fix the presser 14 against the outer peripheral surface 13 of the inner pipe X1. The length, thickness, and cross-sectional shape of each of the inner pipe X1 and the outer pipe X2 can be selected depending on the application. As will be described later, the fitting length between the inner pipe X1 and the outer pipe X2 can be adjusted to adjust the overall length of the inner pipe X1 and the outer pipe X2.

[0021] For example, the inner tube X1 and the outer tube X2 are each hollow cylindrical, and the inner circumferential surface 17 of the outer tube X2 is inserted from one end opening into one end opening of the outer circumferential surface 13 of the inner tube X1, so that the outer tube X2 fits onto the inner tube X1. From the perspective 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. On the other hand, the inner tube X1 does not need to be hollow and may be solid, for example, to ensure strength. When the outer tube X2 is fitted into the inner tube X1, a slight clearance may be provided between the inner circumferential surface 19 of the outer tube X2 and the outer circumferential surface 13 of the inner tube X1, as long as the outer tube X2 is fixed and held longitudinally relative to the inner tube X1 via the fastening screw portion 16 and the pressing body 14, as described later. The slight clearance is, for example, 0.05 mm to 0.1 mm. A pair of through slits 32 spaced apart by a distance D are provided on the outer peripheral surface 21 of the tubular base portion 12, and a female screw portion 34 is provided between the pair of through slits 32. The distance D between the pair of through slits 32 may be selected according to the application of the fixing support jig 10, as will be described later. The tubular base portion 12 that is attached and fixed to one end of the outer tube X2 has a pair of through slits 32 spaced apart on the outer peripheral surface 21 of the tubular base portion 12, and a female screw portion 34 provided between the pair of through slits 32.

[0022] More specifically, the tubular base portion 12 is hollow and cylindrical, with one end fitting onto one end 28 of the outer tube X2, and the other end into which the inner tube X1 is inserted with a predetermined clearance from the outer peripheral surface 21 of the tubular base portion 12. The tubular base portion 12 is preferably made of metal, has a hollow cylindrical shape, and the inner diameter of the tubular base portion 12 is set to be at least larger than the inner diameters of the inner tube X1 and the outer tube X2. However, the outer shape does not necessarily have to be cylindrical; for example, it may be cocoon-shaped, with a larger diameter at the center. The thickness and longitudinal length of the tube may be set as appropriate, for example, a few millimeters or centimeters, as long as it is possible to fix and support the mating inner tube X1 and outer tube X2 in the longitudinal direction of the tube.

[0023] The tubular base portion 12 is composed of a first outer fitting portion extending from one end toward the outer tube X2 and fitting around the outer tube X2, with its inner peripheral surface facing the outer peripheral surface of the outer tube X2 with a first predetermined clearance, and a second outer fitting portion extending from one end toward the inner tube X1 and fitting around the inner tube X1, with its inner peripheral surface facing the outer peripheral surface of the inner tube X1 with a second predetermined clearance. One of a pair of through-hole slits 32 is provided in the first outer fitting portion, and the other of the pair of through-hole slits 32 is provided in the second outer fitting portion. The diameter of the second outer fitting portion is set smaller than the diameter of the first outer fitting portion. The second outer fitting portion constitutes a reduced-diameter portion, and the first outer fitting portion constitutes an expanded-diameter portion. An annular shoulder 17 is formed at the connection between the first and second outer fitting portions, and the annular shoulder 17 can be placed on the annular end face EN of the outer tube X2. The clearance between the inner peripheral surface of the tubular base portion 12 and the outer peripheral surface 13 of the inner tube X1, the clearance between the inner peripheral surface of the tubular base portion 12 and the outer peripheral surface 15 of the outer tube X2, and the clearance 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.

[0024] The pair of through slits 32 are provided at a predetermined interval from each other in the longitudinal direction of the inner and outer tubes X1, X2, respectively, and extend in the longitudinal direction of the inner and outer tubes X1, X2. More specifically, each of the pair of through slits 32 is an elongated opening, and the width of the opening need only be such that the presser body 14 can pass through in the thickness direction. As will be described later, since the presser body is fastened and fixed to the outer tube X2 via the fastening screw portion 16, it is not necessary for the presser body 14 to pass through the pair of through slits 32 provided in the outer peripheral surface 16 of the outer tube X2 in an interference fit manner, and a clearance is allowed between the peripheral edges of the through slits 32 and the outer peripheral edges of the presser body 14, particularly the leg portions 18 (described later).

[0025] The presser body 14 is positioned on the outer peripheral surface 21 of the tubular sleeve portion 12 and passes through a pair of through slits 32 to abut against the outer peripheral surface 13 of the inner tube X1 and the outer peripheral surface 15 of the outer tube X2. More specifically, the male thread portion 26 of the fastening screw portion 16 is provided with a clearance hole 24 penetrating in the thickness direction and two legs 18 extending in opposite directions from the clearance hole 24, forming the presser body 14 with a generally U-shaped vertical cross section. The presser body 14 has a protrusion 25 on its upper surface 22, which is provided with the clearance hole 24. By threading the male thread portion 26 into the female thread portion 34, the lower surface 38 of the shank portion abuts against the upper surface of the protrusion 42 of the presser body 14, and the fastening screw portion 16 and the presser body 14 are threadedly fastened to the inner tube X1 and the outer tube X2. The upper surface of the protrusion 42 functions as a pressure load receiver having a pressure load receiving surface. The pair of legs 18, spaced apart in the extension direction of the pressure load receiver, each have a pressing end surface 20, which is the distal end surface of each leg. The pressing end surfaces 20 are shaped to conform to the outer peripheral surfaces 13, 15 of the inner and outer tubes X1, X2 so as to be in surface contact with the outer peripheral surfaces 13, 15 of the inner and outer tubes X1, X2. For example, if the outer peripheral surface 13 of the inner tube X1 is a cylindrical outer surface, the pressing end surface 20 has an arc-shaped cross section with the same diameter. Unlike the fastening screw portion 16, the pressing body 14 itself does not need to be rotated toward the outer peripheral surfaces 13, 15 of the inner and outer tubes X1, X2. Therefore, the pressing end surfaces 20 can be pressed against the outer peripheral surfaces 13, 15 of the inner and outer tubes X1, X2 with the arc-shaped cross section aligned with the outer peripheral surfaces 13, 15 of the inner and outer tubes X1, X2. It is not necessary for each pressing end surface 20 to be in close contact with the outer circumferential surface 13 of the inner tube X1 and the outer circumferential surface 15 of the outer tube X2.

[0026] The clamping screw portion 16 is configured to be able to press and fix the presser body 14 against the outer peripheral surface 13 of the inner tube X1, and has a shank portion 36 and a male thread portion 26 extending downward from a lower surface 38 of the shank portion 36. The male thread portion 26 is threadably engageable with the female thread portion 34, and the lower surface 38 has an annular surface 40 that surrounds the male thread portion 26. After adjusting the fitting position of the inner tube X1 relative to the outer tube X2, the male thread portion 26 is threadedly engaged with the female thread portion 34 using the clamping screw portion 16, while the presser body 14 is passed through a pair of through slits 32 and pressed and fixed against the outer peripheral surface 13 of the inner tube X1. The clamping screw portion 16 has a head portion 28 that can be gripped and rotated with fingers at the end of the shank portion 36 opposite the end on the male thread portion side. The diameter of the head portion 28 is preferably as large as possible so that it can be rotated by pinching it with fingers with little force, and from the standpoint of preventing slippage, it may be possible to provide multiple shallow grooves spaced apart around the circumference.

[0027] With regard to the use of the fixed support jig 10, the pair of through slits 32 are arranged at a predetermined interval from each other in the longitudinal direction of the inner and outer tubes X1 and X2, extending in the circumferential direction of the inner and outer tubes X1 and X2, respectively, and the inner and outer tubes X1 and X2 are oriented vertically, and a heavy load is supported at a predetermined height by either the inner or outer tube X1 or X2. In particular, when the fixing support jig 10 is used to adjust the fitting length of the inner and outer tubes 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 of the pressing body 14 and the outer peripheral surface 13 of the inner tube X1, the greater the resistance of the pressing surface of the pressing body 14 against the outer peripheral surface 13 of the inner tube X1, i.e., the greater the tightening force of the fastening screw portion 16, and for this reason, the pressing body 14, fastening screw portion 16, and inner and outer tubes X1, X2 that constitute the fixing support jig 10 are required to have strength sufficient to withstand such a large tightening force. Therefore, it is preferable that they are made of metal.

[0028] As a modified example, the fixing support jig 10 may be made of resin from the viewpoint of light weight, and it is particularly preferable to ensure a certain thickness from the viewpoint of ensuring strength around the pair of slits and the opening of the female threaded portion 34. In this case, it is preferable that the pair of through slits 32 are spaced apart from each other by a predetermined distance in the circumferential direction of the inner and outer pipes X1 and X2, respectively.

[0029] A method for adjusting the lengths of the inner and outer tubes X1, X2, particularly for existing inner and outer tubes X1, X2 that fit together, will be described below. The method includes the steps of fitting a tubular base portion 12 having a circular inner cross-section onto the upper end of the outer tube X2, fitting the inner tube X1 into the tubular base portion 12 or the outer tube X2, rotating the tubular base portion 12 to a desired rotational position around the longitudinal direction of the outer tube X2, and pressing the outer peripheral surface of the opposite side of the inner tube X1 against the inner peripheral surface of the tubular base portion 12 or the outer tube X2 from the outside of the tubular base portion 12 in the thickness direction of the tubular base portion 12 to fix the tubular base portion 12 at the desired rotational position around the longitudinal direction of the outer tube X2, thereby fixing and holding the inner and outer tubes X1, X2 together in the longitudinal direction.

[0030] Preferably, the method further includes a step of pressing the tubular base portion 12 from the outside toward the outer surface of the outer tube X2 in the thickness direction of the tubular base portion 12 to fix the tubular base portion 12 at a desired rotational position about the longitudinal direction of the outer tube X2, while pressing the outer surface of the opposite side of the outer tube X2 against the inner surface of the tubular base portion 12, thereby fixing and holding the inner and outer tubes X1, X2 together in the longitudinal direction. Also, the inner surface of the tubular base portion 12 is provided with a reduced diameter portion set larger in diameter than the inner tube X1 and an expanded diameter portion set larger in diameter than the outer tube X2, and an annular shoulder portion 17 is formed at the junction between the reduced diameter portion and the expanded diameter portion, and the annular shoulder portion 17 is placed on the annular upper end surface EN of the outer tube X2 so that the tubular base portion 12 can be rotated at a desired rotational position about the longitudinal direction of the outer tube X2.

[0031] Below, a case where the fixing support jig 10 is applied to an existing music stand stand 100 will be described, taking a music stand as an example of a music stand. As shown in Fig. 11, an existing music stand stand has inner and outer tubes that fit together, with the music stand connected to the upper end of the inner tube X1 and a tripod part 106 connected to the lower end of the outer tube X2, which holds the music stand stand upright, and 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 fix and hold it in place.

[0032] 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 base portion 12 of the fixing support jig 10 is fitted onto the upper end of the outer tube X2 through one opening with the other hand, so that the annular shoulder portion 17 of the tubular base portion 12 rests on the upper circumferential end of the outer tube X2. The tubular base portion 12 is fitted over the upper end of the outer tube X2, with a predetermined clearance maintained between the inner circumferential surface of the tubular base portion 12 and the outer circumferential surfaces of the outer tube X2 and inner tube X1, and the tubular base portion 12 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. Next, the tubular base portion 12 is rotated with the other hand around the longitudinal direction of the inner and outer tubes, and positioned at a desired rotation position, for example, a position where the fastening screw 16 can be fastened with the right hand in the case of a right-handed person.

[0033] Next, while supporting the inner tube X1 with one hand, the fastening screw 16 is tightened with the other hand to lock the rotation of the tubular base portion 12 about the longitudinal direction of the inner and outer tubes X2, fix and support the inner and outer tubes X2 to each other, and set to the desired height of the music stand F. More specifically, the fastening screw portion is passed through the clearance hole of the load receiving portion, and the male thread portion is threaded into the female thread portion, while one of the pair of pressing bodies is passed through the through hole of the first outer fitting portion to bring the corresponding pressing end face into surface contact with the outer circumferential surface of the inner tube X1, and the outer circumferential surface of the inner tube X1 on the side opposite to the surface contact portion of the pressing end face with the inner tube X1 is pressed and fixed against the inner circumferential surface of the outer tube X2 at the fitting portion of the inner and outer tubes X2, and the other of the pair of pressing body is passed through the through hole of the second outer fitting portion to bring the corresponding pressing end face into surface contact with the outer circumferential surface of the outer tube X2, thereby pressing and fixing The tubular base 12 attached to the outer peripheral surface of one end of the outer tube X2 is free to rotate about the longitudinal direction of the inner and outer tubes X1, X2 until it is screwed in by the fastening screw 16. The screwing in of the fastening screw 16 fixes the rotation of the tubular base 12 and also fixes and holds the inner and outer tubes X1, X2 relative to each other in the longitudinal direction of the inner and outer tubes X1, X2. When this fixing support jig is applied to a music stand, the simple structure improves usability when adjusting the stand height. For example, in a big band where multiple instruments are performed in front of an audience, the music stands F stands placed in front of each performer are large and heavy, with a large tube diameter, rather than lightweight, foldable music stands F stands. By setting a large number of such heavy-looking music stands F stands in aligned, rotated positions, it is possible to easily present a unified appearance. To change the height of the music stand F, simply loosen the fastening screws 16, adjust the fitting position of the inner tube X1 relative to the outer tube X2, and then refasten them. In particular, to lower the height of the music stand F, simply loosen the fastening screws 16 with one hand and quickly fasten them, and the inner tube X1 will fall under its own weight, so there is no need to support the inner tube X1 with the other hand. Note that if the existing screws can also be used for the fixing support jig, they may be used as is without preparing new screws.

[0034] As described above, after adjusting the fitting length of the inner tube X2 relative to the outer tube X1 according to the desired height, the annular shoulder portion 17 formed at the boundary between the inner diameter-reducing side and the inner diameter-expanding side of the tubular base portion 12 is placed on the annular circumferential surface 21 at one end of the outer tube X1. This allows the tubular base portion 12 to freely rotate around the longitudinal direction of the inner and outer tubes X1, so that while holding the inner tube X2 with one hand, the tubular base portion 12 can be easily rotated to the desired rotation position with the other hand.

[0035] Next, by threading the fastening screw 16 into the tubular base portion 12, one pressing end face 20 of the U-shaped pressing body 14 comes into contact with the outer peripheral surface 13 of the inner tube X2, and the outer peripheral surface 13 of the inner tube X2 on the opposite diametrical side is pressed against the inner peripheral surface of the inner narrowing side portion 17 of the tubular base portion 12, and the other pressing end face 20 of the U-shaped pressing body 14 comes into contact with the outer peripheral surface 13 of the inner tube X2, and the outer peripheral surface 13 of the inner tube X2 on the opposite diametrical side is pressed against the inner peripheral surface of the inner expanding side portion 19 of the tubular base portion 12, thereby fixing the inner tube X2 and the outer tube X1 to the tubular base portion 12. Therefore, even if there is clearance at the fitting portion of the inner and outer tubes X1, the inner tube X2 and the outer tube X1 are fixed to each other in the longitudinal direction of the tubes, and rotation of the tubular base portion 12 about the longitudinal direction of the inner and outer tubes X1 is fixed. For this reason, the difference between the length L1 from the pressing load receiving surface 22 of one pressing end face 20 corresponding to the inner tube X2 and the length L2 from the pressing load receiving surface 22 of the other pressing end face 20 corresponding to the outer tube X1 is determined by the thickness t1 of the outer tube X1 and the clearance between the outer peripheral surface 13 of the inner tube X2 and the inner peripheral surface 23 of the outer tube X1, and is set to be at least larger than the thickness t1 of the outer tube X1, and the width w of the annular shoulder portion 17 is set to be at least larger than the thickness t1 of the outer tube X1.

[0036] By setting the width of the annular shoulder 17 formed at the boundary between the inner narrowing side and the inner widening side of the tubular base 12 to a larger value, and by preparing multiple types of U-shaped pressing bodies 14 with different lengths L1 and L2, it is possible to apply a versatile tubular base 12 to a music stand having an existing inner and outer tube X1, and by selecting the type of U-shaped pressing body 14, it is possible to additionally attach only a fixing and holding jig having the tubular base 12, U-shaped pressing body 14, and fastening screw 16, rather than replacing the entire music stand. Note that by selecting the type of U-shaped pressing body 14, it is preferable that one pressing end face 20 and the other pressing end face 20 simultaneously contact the outer peripheral surfaces of the inner tube X2 and the outer tube X1. However, even if they do not contact simultaneously, the slight inclination of the pressing load receiving surface 22 of the U-shaped pressing body 14 makes it possible to fix and hold the inner and outer tubes X1 to each other and to rotate the tubular base 12.

[0037] On the other hand, by precisely setting the width of the annular shoulder portion 17 of the tubular base portion 12 for the existing inner and outer tubes X1, X2 and creating a custom-made tubular base portion 12 with no clearance where the inner and outer tubes X1, X2 fit together, the fastening screw portion 16 not only causes the U-shaped pressing body 14 to press the inner and outer tubes X1, X2 against the inner surface of the tubular base portion 12, but also presses the outer surface 13 of the inner tube X2 against the inner surface of the outer tube X1 in line contact on the diametrically opposite side of the pressing end face 20 of the U-shaped pressing body 14 at the fitting portion of the inner and outer tubes X1, X2, so that the inner tube X2 and the outer tube X1 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. By screwing in the fastening screw, the inner and outer tubes are fixed together via the tubular base portion 12, and the rotation of the inner and outer tubes around the longitudinal direction of the tubular base portion 12 is fixed. Then, by screwing in the set screw 38 from one end of the tubular base portion 12 to the opening of one of the legs 18 of the U-shaped presser body 14, the male threaded portion of the fastening screw is completely detached from the female threaded portion of the pipe sleeve, and even if the U-shaped presser body 14 becomes free, the set screw 38 can prevent the U-shaped presser body 14 from falling off the tubular base portion 12. In the case of medical stands for infusions, monitors, lighting, etc., casters are usually attached to the bottom of the inner and outer tubes and they are moved to many treatment sites. During this time, the unevenness of the floor causes the stand to vibrate up and down, so there is a high need to firmly fix the mating fixing parts of the inner and outer tubes, and there is a high need to adjust the direction of the infusions, monitors, and lighting during treatment. For these reasons, the fixing support jig of the present invention is more effective than music stands, which are usually transported to performance sites and there is little need to adjust the height and direction of the music stand, microphone, amplifier, etc. during performance.

[0038] 18, 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 end face 20 of one leg portion 18 of the pressing body 14 is pressed against the outer peripheral surface 13 of the inner tube X1, and the pressing end face 20 of the other leg portion 18 is pressed against the outer peripheral surface of the outer tube X2. This eliminates the need to directly fix and hold the inner and outer tubes X2 through the fitting portions of the inner and outer tubes X2, and it is sufficient to indirectly fix and hold the inner and outer tubes X1 and X2 via the tubular base portion 12. Therefore, the inner and outer tubes X1 and X2 can be fixed and held in a state where there are no fitting portions of the inner and outer tubes X2, in other words, when the overall lengths of the inner and outer tubes X1 and X2 are long.

[0039] According to the fixing support jig 10 having the above-described configuration, in the inner and outer tubes that both extend in the vertical direction and are fitted together, a tubular base portion having a pair of through holes on its outer surface, sandwiching a female thread portion, is attached to the outer surface of one end of the outer tube, and one leg portion of the pressing body 14 having a generally U-shaped vertical cross section extends from one end of the outer tube toward the outer tube, and passes through one of the through holes provided in a first external fitting portion that is fitted onto the inner tube with its inner surface facing the outer surface of the inner tube with a first predetermined clearance. One leg extends from one end of the outer tube toward the inner tube, and the other leg is inserted through the other through-hole provided in a second external fitting part that fits externally onto the outer tube, the inner peripheral surface of which faces the outer peripheral surface of the outer tube with a second predetermined clearance, and the male threaded part of the fastening screw part is screwed into the female threaded part, thereby making it possible to press the pair of pressing bodies against the pressing load receiving parts, and when a weight is to be supported by either the inner or outer tube, the fitting position of the inner tube relative to the outer tube is adjusted according to the predetermined height of the weight, and then the load receiving part is fastened to the inner or outer tube by the fastening screw part. the other of the pair of legs is inserted through the through hole of the second outer fitting portion so that the corresponding pressing end face is in surface contact with the outer peripheral surface of the outer tube, thereby pressing and fixing the outer peripheral surface of the inner tube on the side opposite to the surface-contacting portion of the pressing end face against the inner peripheral surface of the outer tube or the tubular base portion, and the other of the pair of legs is inserted through the through hole of the second outer fitting portion so that the corresponding pressing end face is in surface contact with the outer peripheral surface of the outer tube, thereby pressing and fixing the outer peripheral surface of the outer tube. Until being screwed in by the fastening screw portion, the tubular base portion attached to the outer peripheral surface of one end of the outer tube is free to rotate about the longitudinal direction of the inner and outer tubes, and screwing in by the fastening screw portion fixes such rotation of the tubular base portion and enables the inner and outer tubes to be fixed and held in place in the longitudinal direction of the inner and outer tubes. When such a fixing support jig is applied to a music stand or a medical stand, the simple structure makes it possible to improve usability when adjusting the stand height.

[0040] A second embodiment of the present invention will be described below. In the following description, components similar to those of the first embodiment will be assigned the same reference numerals and will not be described again. Below, the features of this embodiment will be described in detail with reference to FIGS. 9 and 10 . The second embodiment of the present invention is characterized in that, when a male thread portion is provided near the upper end of the outer tube X2, one pressing end surface of the U-shaped presser body has a surface shape that closely contacts the male thread portion. More specifically, when a male thread portion is provided helically with a predetermined pitch near the upper end of the outer tube X2, one pressing end surface of the U-shaped presser body has a female thread portion that is complementary in shape to the predetermined helical pitch. This makes it possible to reliably prevent the tubular sleeve portion 12 from slipping upward from the outer tube X2 via one pressing end surface of the U-shaped presser body. In particular, when the outer tube X2 of an existing music stand has a male thread, more specifically, when the inner and outer tubes X1 and X2 are fixed to each other not by screwing them from the side as described above, but by screwing a sleeve having a female thread that can be threaded onto the male thread on the outer surface of the outer tube X2 in the longitudinal direction of the inner and outer tubes X1 and X2, thereby tightening and fixing the entire inner surface of the outer tube X2 to the entire outer surface of the inner tube X1, a tubular base 12 can be prepared having a female thread that can be threaded onto the male thread within a predetermined range on its inner surface.In this case, instead of placing the annular shoulder 17 of the tubular base 12 of the fixing support jig on the upper peripheral end of the outer tube X2 as described above, the tubular base 12 can be freely rotated around the longitudinal direction of the inner and outer tubes X1 and X2 with the female thread of the tubular base 12 threaded onto the male thread of the outer tube X2.

[0041] A third embodiment of the present invention will be described below. In the following description, components similar to those of the first embodiment will be assigned the same reference numerals and will not be described again. Below, the features of this embodiment will be described in detail with reference to Figures 16 and 17. This embodiment is similar to the first embodiment in that the tubular base portion 12 is rotatably held on the annular end face EN of the outer tube X2, and the inner and outer tubes X1 and X2 are fixed together by pressing the pressing end face 20 against the outer peripheral surface 13 of the inner tube X1 with a fastening screw via a through slit in the tubular base portion 12. However, whereas the first embodiment uses the pressing end faces 20 of both legs 18 of a single U-shaped pressing body 14, this embodiment is characterized by the use of an L-shaped pressing body 14.

[0042] 17 , the L-shaped pressing body 14 has only one leg 18 that can pass through the through slit of the tubular base 12, while the other leg 18 in the first embodiment does not have a through slit in the tubular base 12 and serves as an abutment portion 60 with an abutment surface 62 at its end that abuts against the outer peripheral surface 21 of the tubular base 12. The length of the abutment portion 60 is set so that the pressing end surface 20 of the one leg 18 can be pressed against the outer peripheral surface 13 of the inner tube X1. The width w of the annular shoulder 17 is set to the thickness of the outer tube X2, and the tubular base 12 can rotate about the longitudinal direction of the inner and outer tubes X1, X2 with the annular shoulder 17 placed on the annular end face EN of the outer tube X2. By tightening the fastening screw 16, the pressing end face 20 of one leg 18 is pressed against the outer peripheral surface 13 of the inner tube X1, and on the side opposite to the pressing end face 20 of one leg 18, the outer peripheral surface 13 of the inner tube X1 is pressed against the inner peripheral surface of the tubular base 12. At the mating portion of the inner and outer tubes X1, X2, the outer peripheral surface 13 of the opposite inner tube X1 is pressed against the inner peripheral surface of the outer tube X2, thereby fixing and holding the inner and outer tubes X1, X2 together. For example, this embodiment can be effectively applied when the length of the fitting portion of the inner and outer tubes X1, X2 is adjusted within the range in which the inner and outer tubes X1, X2 are fitted together when used as a music stand such as a music stand or a microphone stand to adjust the height of the music stand or microphone. Note that if the upper surface 22 of the L-shaped pressing body 14 is pressed parallel to the outer surface 21 of the tubular base 12 toward the outer surface 13 of the inner tube X1 by the fastening screw portion 16, the abutment portion 60 may be omitted, and the other leg 18 may be omitted to form a complete L-shaped pressing body 14.

[0043] As a modified example, as shown in FIG. 16 , two L-shaped pressers 14 may be stacked instead of a single U-shaped presser 14. More specifically, each L-shaped presser 14 has a horizontal portion parallel to the longitudinal direction of the inner and outer tubes X1 and X2 and an orthogonal portion perpendicular thereto. The horizontal portion has a clearance hole, the orthogonal portion forms a leg 18, and a pressing end surface 20 is provided at the tip. The two L-shaped pressers 14 are stacked horizontally so that one horizontal portion extends toward the other orthogonal portion. Therefore, the length l of the horizontal portion is set so that it abuts against the inner surface of the other orthogonal portion. Unlike the first embodiment, the two L-shaped pressers 14 can be moved independently within the corresponding through slits. However, since they can be separated by attaching or detaching the fastening screws, each L-shaped presser 14 is provided with a set screw and a corresponding through hole.

[0044] As a result, by passing the male threaded portion of the fastening screw through the clearance holes of the upper L-shaped pressing body 14 and the lower L-shaped pressing body 14 and tightening it into the female threaded portion of the tubular base portion 12, the pressing end face 20 of the upper L-shaped pressing body 14 is pressed against the outer peripheral surface of the outer tube X2, and the pressing end face 20 of the lower L-shaped pressing body 14 is pressed against the outer peripheral surface 13 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.

[0045] For example, in the first embodiment, the inner and outer tubes X1 and X2 are both circular and have a constant cross section, and the tubular base portion 12 is placed on the annular end face EN of the outer tube X2, and the tubular base portion 12 is rotated to a desired angle position about the longitudinal direction of the tube, and the inner and outer tubes X1 and X2 are fixed and held together by the fastening screw portion 16 or the pressing lever 301 via the U-shaped or L-shaped pressing body 14 while fixing the rotation of the tubular base portion 12. However, the present invention is not limited to this. For example, the inner tube X1 has a constant circular cross section, In the case where the outer tube X2 has a rectangular shape, for example, a square with a constant cross section, into which the inner tube X1 can be fitted, the tubular base portion 12 can be held in one hand, and without placing it on the annular end face EN of the outer tube X2, the tubular base portion 12, which is concentric with the inner tube X1, can be rotated to a desired angular position around the longitudinal direction of the tube while floating above the inner tube X1, which has a circular cross section, without placing it on the annular end face EN of the outer tube X2.Then, the tubular base portion 12 can be placed at that height or on the annular end face EN of the outer tube X2 using the fastening screw portion 16 or the pressing lever 301, and the inner and outer tubes X1 and X2 can be fixed together while the rotation of the tubular base portion 12 is fixed.

[0046] A fourth embodiment of the present invention will be described below. In the following description, components similar to those of the first embodiment will be assigned 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 12 to 15. The fourth embodiment of the present invention is similar to the first embodiment in that it uses a U-shaped pressing body to fix and hold the inner and outer tubes together. However, unlike the first embodiment, it is characterized in that it employs a pressing lever mechanism 300 instead of a fastening screw portion. Specifically, the annular peripheral surface 308 of the rotating portion is curved such that the radius from the axis increases from a first radius to a second radius, and by rotating the pressing lever 301, a pair of pressing bodies 34 can move in the thickness direction of the slit within the corresponding through slit 62. By rotating the pressing lever 301 around an axis provided at a predetermined height from the outer peripheral surface 14 of the annular sleeve 12, the pressing bodies 34 begin to press against the outer peripheral surfaces 14 of the inner and outer tubes X1 and X2 at a rotational position corresponding to an intermediate radius between the first radius and the second radius, and finish pressing against the outer peripheral surfaces 14 of the inner and outer tubes X1 and X2 at a rotational position corresponding to the second radius, so that the pressing end faces are in surface contact with the outer peripheral surfaces 14 of the inner and outer tubes X1 and X2, and the outer peripheral surfaces 14 of the inner and outer tubes X1 and X2 on the opposite side of the surface contact portion of the pressing end faces with the inner and outer tubes X1 and X2 are pressed and fixed against the inner peripheral surface of the tubular base portion 12.

[0047] The pressing lever mechanism 300 comprises a pressing lever 301 that presses the pressing body 14 against the outer circumferential surfaces 14 of the inner and outer tubes X1 and X2, a pivot 302 that extends parallel to the tubular base portion 12 and enables the pressing lever 301 to rotate between a non-pressing circumferential position and a pressing circumferential position, and a pin 304 that holds the pivot 302 at a predetermined height from the outer circumferential surface of the tubular base portion 12 (tubular base portion). The pressing lever 301 is an integral structure with a roughly tadpole cross section, and has a grip lever portion 303 that is gripped with the fingers and a rotating portion 308 that is integral with the grip lever portion 303 and rotates around the pivot 302, with the pivot 302 provided at the center of the rotating portion 308. More specifically, the rotating portion 308 is provided with a notch 310, which separates the rotating portion 308 into opposing rotating portions. A pin 304 is positioned within the notch 310. A pivot 302 passing through the pin 304 passes through a through-hole with a circular cross section provided in each rotating portion, allowing each rotating portion, i.e., the pressing lever 301, to rotate about the pivot 302 between a non-pressing circumferential position and a pressing circumferential position. The pressing lever 301 may be made of resin from the viewpoint of lightness. The length of the arm from the center O of the pivot 302 of the grip lever portion 303 is preferably determined so that the pressing lever 301 can be sufficiently pressed down by hand using the principle of leverage. Each rotating portion has a curved peripheral surface 312, and while the pressing lever 301 rotates around the pivot 302 between a non-pressing circumferential position and a pressing circumferential position, one of the portions of the curved peripheral surface 312 is held in contact with the upper surface 33 of the pressing body 14, so that the rotation of the pressing lever 301 causes the pressing body 14 to move in the thickness direction of the tubular base portion 12 within the through slit 62.

[0048] The pin 304 has its lower end screwed to the outer circumferential surface 21 of the tubular base portion 12 so as to stand upright, and is provided with a through-hole (not shown) midway through which the pivot 302 can pass. According to the above configuration, by adjusting the amount of threading of the pin 304 into the tubular base portion 12, the height of the pivot 302 relative to the outer peripheral surface 21 of the tubular base portion 12 is adjusted, and then the pressing lever 301 is rotated about the pivot 302 from the non-pressing circumferential position to the pressing circumferential position, so that the pressing body 14 is pressed against the outer peripheral surfaces 14 of the inner and outer tubes X1, X2 via the curved circumferential surface 312 of the rotating portion 308. Compared to the first to eleventh embodiments that use threaded rotation by the fastening screw portion 16, by simply pressing the pressing lever 301 down from the non-pressing circumferential position to the pressing circumferential position with one touch, it is possible to fix and hold both the inner and outer tubes X1, X2 while maintaining the pressing circumferential position of the pressing lever 301. Conversely, by simply pressing the pressing lever 301 up from the pressing circumferential position to the non-pressing circumferential position with one touch, it is possible to move both the inner and outer tubes X1, X2 relative to each other in the longitudinal direction.

[0049] As a modified example, the pin 304 and the pivot 302 may be integrally formed. That is, without providing a through-hole for the pivot 302 in the pin 304, the pivots 302 may be provided separately on the outer peripheral surface of the pin 304 from diametrically opposite positions extending in opposite directions. Note that if adjustment of the height of the pivot 302 from the outer peripheral surface 21 of the tubular base portion 12 is not required, the pin 304 may be fixed without providing a rotatable threaded portion at its lower end.

[0050] In this embodiment, a male threaded portion 335 extending upward for a predetermined height is provided on the upper surface of the U-shaped pressing body 14, and a ring plate 314 having an opening in the center is provided on the inner peripheral surface of the opening with a female threaded portion 337 that can be threaded onto the male threaded portion 335. More specifically, the ring plate 314 has an annular upper surface 315 and an annular lower surface 316, and the female threaded portion 337 is provided along the distance between the annular upper surface 315 and the annular lower surface 316, i.e., along the entire thickness of the ring plate 314. The thickness of the ring plate 314 is set shorter than the length of the male threaded portion 335, and the diameter of the ring plate 314 needs to be set so that the curved peripheral surfaces 312 of both rotation portions are held in contact with the annular upper surface 315 of the ring plate 314. Thus, by adjusting the amount by which the female thread portion 337 of the ring plate 314 is screwed into the male thread portion 335 of the U-shaped presser 14, the height of the annular upper surface 315 of the ring plate 314, with which the curved peripheral surface 312 is in contact and held, from the outer peripheral surface 21 of the tubular base portion 12 can be adjusted, and by rotating the presser lever about the pivot 302, the amount by which the pair of pressing end faces of the U-shaped presser 14 protrude inward from the inner peripheral surface of the tubular sleeve 12 toward the outer peripheral surface of the inner tube X1 can be adjusted, thereby adjusting the pressing force against the outer peripheral surface of the inner tube X1. The hollow sleeve 333 is fitted and fixed to the outer peripheral surface 21 of the tubular base portion 12, and the pin 304 passes through the hollow portion, while the clearance hole of the U-shaped presser and the opening of the ring plate pass through the outer periphery of the hollow sleeve 333. The cross-sectional shape of the hollow sleeve 333 is non-circular, and its height from the outer peripheral surface 21 of the tubular base portion 12 is set to about 310, so that even if the pressing lever 301 tries to rotate around the pin 304, it hits the non-circular upper end of the hollow sleeve 333 and is unable to rotate. The tubular base portion 12 can be manufactured by machining, 3D printer modeling, or lost wax casting. In the case of 3D printer modeling or lost wax casting, the hollow sleeve 333 and the tubular base portion 12 can be machined as a single unit without fitting and fixing the hollow sleeve 333 to the outer peripheral surface 21 of the tubular base portion 12.

[0051] For example, the amount of threading may be adjusted depending on the clearance between the inner peripheral surface of the sleeve and the outer peripheral surface of the inner tube, or the amount of threading may be adjusted to increase the pressing force while maintaining the same clearance. From this perspective, it is preferable to set the threading range, i.e., the length of the male thread portion of the U-shaped pressing body. As described above, it is possible to adjust the amount of threading of the female thread portion of the ring plate 314 into the male thread portion of the U-shaped pressing body in advance so that the pressing lever can be rotated manually when rotating the pressing lever to the pressing end circumferential position ( FIG. 15 ) about the pivot 302. It is also possible to adjust the pressing force itself within the range in which the pressing lever can be rotated manually when rotating the pressing lever to the pressing end circumferential position about the pivot 302.

[0052] 15 , the curved circumferential surface 312 has a distance R1 between the center O of the pivot 302 and the lower end of the curved circumferential surface 312 at the non-pressing circumferential position, a distance R2 between the center O of the pivot 302 and the lower end of the curved circumferential surface 312 at the pressing start circumferential position, and a distance R3 between the center O of the pivot 302 and the lower end of the curved circumferential surface 312 at the pressing end circumferential position, where R1 > R2 > R3, and the pressing body 14 is pressed against the outer circumferential surfaces 14 of the inner and outer tubes X1 and X2 by the difference between R2 and R3. The difference between R2 and R3 may be set so that the pressing force of the pressing body 14 is sufficient to fix and hold both the inner and outer tubes X1 and X2. For example, if the thickness of the tubular base portion 12 is several millimeters, the difference between R2 and R3 is about one-twentieth to one-tenth of that thickness. The curved circumferential surface 312 is set to smoothly change from R1 to R3, and in order to fix and hold the pressing lever 301 in the pressing circumferential position, it is preferable to form an arc portion having a central angle range of, for example, 90 degrees and a constant R3 relative to the center O of the pivot shaft 302 from the curved circumferential surface portion corresponding to the pressing start circumferential position of the pressing lever 301, and to set it so that the central angle range gradually decreases from there. The entire curved circumferential surface 312 may be configured from a combination of multiple arc portions that are smoothly connected to each other, or may be an ellipse whose major axis corresponds to R3. When the pressing lever 301 is positioned at the circumferential position where pressing starts, the grip lever portion 303 is oriented approximately upright so that it can be easily pressed down by hand, and when the pressing lever 301 is positioned at the circumferential position where pressing ends, the grip lever portion 303 is oriented close to the outer peripheral surface 21 of the tubular base portion 12 so that it does not protrude from the outer peripheral surface 21 of the tubular base portion 12 and get in the way, and the curved shape of the grip lever portion 303 is preferably determined so that space is formed between the inner surface of the grip lever portion 303 and the outer peripheral surface 21 of the tubular base portion 12 to allow a finger to be inserted.

[0053] Even if the screw-in adjustment amount is large, the pressing lever 301 can be firmly fixed in the vertical direction relative to the male thread portion 310 when pressed down without changing the installation direction of the pressing lever 301.

[0054] A fifth embodiment of the present invention will be described below. In the following description, components similar to those of the first embodiment will be assigned the same reference numerals and will not be described again. Below, the features of this embodiment will be described in detail with reference to Figures 19 and 21. The features of this embodiment are the same as those of the first embodiment in that the tubular base portion 12 is rotatably held on the annular end face EN of the outer tube X2, and the pressing end face 20 is pressed against the outer peripheral surface 13 of the inner tube X1 by the fastening screw 16, thereby fixedly holding the inner and outer tubes X1 and X2 together. However, whereas the first embodiment uses the pressing end faces 20 of both legs 18 of a single U-shaped pressing body 14, this embodiment is characterized in that a pair of L-shaped pressing bodies 14 is used.

[0055] 20 , an L-shaped pressing body 14 and a fastening screw portion 16 are provided near each end face 40, 41 of the tubular base portion 12. The L-shaped pressing body 14 has a horizontal portion 330 that forms the pressing load receiving surface 22 on its upper surface, and a vertical portion 332 that extends perpendicularly from one end of the horizontal portion 330 in the opposite direction to the pressing load receiving surface 22, the vertical portion 332 forming a leg portion, and the pressing end surface 20 is formed at the tip of the vertical portion 332. The L-shaped pressing body 14 has only one leg portion 18 that can pass through the through slit 32 of the tubular base portion 12, and the other end of the horizontal portion 330 is provided with an abutment portion 60 that has an abutment surface 62 at its end that abuts against the outer circumferential surface of the tubular base portion 12. The length of the abutment portion 60 is set so that the pressing end surface 20 of one leg portion 18 can be pressed against the outer peripheral surface 13 of the inner tube X1. The horizontal portion 330 of each L-shaped pressing body 14 protrudes from the corresponding end surface 40, 41 of the tubular base portion 12, and the vertical portion 332 faces the outer peripheral surface of the inner tube X1 or outer tube X2 on the inner tube X1 or outer tube X2 side of the corresponding end surface 40, 41 of the tubular base portion 12. This makes it possible to omit the through slits 32 through which the legs pass in the tubular base portion 12, unlike the first embodiment. The length of the horizontal portion 330 of each L-shaped pressing body 14 is set so that the corresponding vertical portion 332 protrudes from the corresponding end surface of the tubular base portion 12. In addition, from the viewpoint of convenience when rotating the tubular base portion 12 to a desired rotation position around the longitudinal direction of the outer tubes X1 and X2, the pair of L-shaped pressing bodies 14 and the pair of fastening screw portions 16 are set on the same side of the tubular base portion 12.

[0056] As described above, for example, in a music stand stand in which a music stand is supported at the upper end of the inner tube X1, if the overall length of the inner tube X1 is short and the height of the music stand cannot be raised to the desired level, the length of the tubular base portion 12 can be set long and L-shaped pressing bodies 14 and fastening screw portions 16 can be provided near each end of the tubular base portion 12, which does not have the through slits 32.As in the first embodiment, the tubular base portion 12 can be rotated to the desired rotation position about the longitudinal direction of the outer tubes X1 and X2 until each fastening screw portion 16 is fastened.By fastening each fastening screw portion 16, the rotation of the tubular base portion 12 about the longitudinal direction of the inner and outer tubes X1 and X2 can be fixed, and the pair of L-shaped pressing bodies 14 can hold the inner and outer tubes X1 and X2 fixed to each other.

[0057] On the other hand, if the length of the tubular base portion 12 is short, an L-shaped pressing body 14 and a fastening screw portion 16 may be provided in a similar manner only at one end of the tubular base portion 12, as shown in Figure 21, or a U-shaped pressing body 14 may be provided so as to straddle the tubular base portion 12, as shown in Figure 19.

[0058] It is also possible to set the fastening screw portion 16 or the pressing lever 301 independently for each L-shaped pressing body 14 of the tubular base portion 12, with one being the fastening screw portion 16 and the other being the pressing lever 301.

[0059] A sixth embodiment of the present invention will be described below. In the following description, components similar to those of the first embodiment will be assigned the same reference numerals and will not be described again. Below, the features of this embodiment will be described in detail with reference to Figures 22 to 24. This embodiment is similar to the first embodiment in that the tubular base portion 12 is rotatably held on the annular end face EN of the outer tube X2, and the pressing end face 20 is pressed against the outer peripheral surface 13 of the inner tube X1 by the fastening screw 16, thereby fixedly holding the inner and outer tubes X1 and X2 together. However, whereas the first embodiment uses the pressing end faces 20 of both legs 18 of a single U-shaped pressing body 14, this embodiment is characterized in that, when the clearance C between the inner and outer tubes X1 and X2 is large, the lower part of the tubular base portion 12 is inserted into the annular clearance between the inner and outer tubes X1 and X2, and a pair of L-shaped pressing bodies 14 is employed, as in the fifth embodiment.

[0060] 22 to 24, by tightening the fastening screw portion 16, the upper pressing end surface 20 of the L-shaped pressing body 14 is pressed against the outer peripheral surface of the inner tube X1, and the lower abutment surface 62 of the L-shaped pressing body 14 is pressed against the bottom surface of an annular groove 64 provided near and below the annular end surface EN of the outer tube X2. As a result, the outer peripheral surface of the inner tube X1 on the side opposite to the L-shaped pressing body 14 is pressed in line contact against the inner peripheral surface of the tubular base portion 12 over the entire length, and the outer tube X2 is pressed in a manner that it is sandwiched between the lower abutment surface 62 of the L-shaped pressing body 14 and the outer peripheral surface of the tubular base portion 12, thereby fixing and holding the inner and outer tubes X1 and X2 together. Since the lower abutment surface 62 of the L-shaped pressing body 14 fits into the bottom surface of the annular groove 64, the L-shaped pressing body 14 can reliably prevent the tubular base portion 12 from slipping upward from the outer tube X2. However, by placing the annular shoulder portion 17 of the tubular base portion 12 on the annular end face EN of the outer tube X2, rotating the tubular base portion 12 about the longitudinal direction of the inner and outer tubes X1, X2 to a desired rotation position, and tightening the fastening screw portion 16, the tubular base portion 12 can be prevented from slipping upward from the outer tube X2, and the annular groove 64 may be omitted.

[0061] As described above, unlike the first embodiment, it is sufficient to provide the annular shoulder 17 on the outer peripheral surface of the tubular base 12, without providing a step on the inner peripheral surface of the tubular base 12 to provide the annular shoulder 17. Unlike the first embodiment, the opposite side of the outer peripheral surface of the inner tube X1 where the L-shaped presser 14 abuts is not pressed against the inner peripheral surface of the outer tube X2. Instead, the outer tube X2 is pressed in a manner that it is sandwiched between the lower abutment surface 62 of the L-shaped presser 14 and the outer peripheral surface of the tubular base 12. Therefore, the outer tube X2 does not necessarily have to be made of a metal that can ensure strength against a pressing load, such as a thin metal or resin. The clearance C between the inner and outer tubes X1 and X2 is appropriate as long as the annular reduced diameter portion below the annular shoulder 17 of the tubular base 12 can be inserted. For example, in the case of a music stand, the clearance C is preferably approximately the same as the wall thickness of the outer tube X2, which is several millimeters. The vertical positional relationship between the inner and outer tubes X1 and X2 does not need to be such that they overlap each other as shown in the figure, but rather the inner tube X1 is positioned so that the upper pressing end face 20 of the L-shaped pressing body 14 can be pressed against the outer peripheral surface of the inner tube X1.

[0062]

[0046] While the embodiments of the present invention have been described above in detail, those skilled in the art can make various modifications and alterations without departing from the scope of the present invention. For example, in the first embodiment, from the viewpoint of protecting the outer surface of the inner pipe X1, the tip of the male thread portion 26 of the fastening screw portion 16 passes through the female thread portion 34 of the outer pipe X2 or the tubular base portion 12 so as not to come into contact with the outer surface of the inner pipe X1. However, this is not limited to this. If the inner and outer pipes X1 and X2 are made of metal, the tip of the male thread portion 26 of the fastening screw portion 16 can come into contact with the outer surface of the inner pipe X1 in addition to the pressing end face 20 of the pressing body 14, thereby more firmly fixing the outer pipe X2 to the inner pipe X1. 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.

[0063] For example, in the first embodiment, it has been described that the fastening screw portion 16 has a male thread portion 26 and a head portion 28 that is gripped with the fingers and rotated, while the female thread portion 34 is provided on the outer peripheral surface 15 of the outer tube X2. However, without being limited to this, the male thread portion 26 may be provided on the outer peripheral surface 15 of the outer tube X2, while the fastening screw portion 16 may be in the form of a nut that screws onto the male thread portion 26. For example, in the first embodiment, a single fixing support jig is provided at a predetermined position of the inner and outer tubes X1 and X2. However, the present invention is not limited to this. For example, when a pair of through slits 32 are provided at an interval in the longitudinal direction of the inner and outer tubes X2, a plurality of pairs of such through slits 32 may be provided in the circumferential direction of the inner and outer tubes X1 and X2, and a plurality of pressing bodies may be provided accordingly. In each pressing body, it may be possible to select independently and individually which of the common fastening screw portion 16 and the pressing lever 301 is to be used as the pressing load applying portion that applies a pressing load to the pressing load receiving portion of the pressing body 14.

[0064] 1 is an overall perspective view of a fixing support jig according to a first embodiment of the present invention; FIG. 2 is an exploded perspective view of a fixing support jig according to a first embodiment of the present invention; FIG. 3 is a perspective view of a tubular base portion 12 of a fixing support jig according to a first embodiment of the present invention; FIG. 4 is a perspective view of a pressing body of a fixing support jig according to a first embodiment of the present invention; FIG. 5 is a perspective view of a fastening screw portion of a fixing support jig according to a first embodiment of the present invention; FIG. 6 is a cross-sectional side view of a fixing support jig according to a first embodiment of the present invention; FIG. 7 is a cross-sectional view of a fixing support jig according to a first embodiment of the present invention, taken along line AA before and after fastening with a fastening screw; FIG. 8 is a cross-sectional view of a fixing support jig according to a first embodiment of the present invention, taken along line BB before and after fastening with a fastening screw; FIG. 9 is a view corresponding to FIG. 2 of a fixing support jig according to a second embodiment of the present invention; FIG. 10 is a view corresponding to FIG. 6 of a fixing support jig according to a second embodiment of the present invention; FIG. 11 is a perspective view of a music stand to which a fixing support jig according to a first embodiment of the present invention is applied; FIG. 12 is an exploded view of a fixing support jig according to a fourth embodiment of the present invention; FIG. 13 is a cross-sectional view of a fixing support jig according to a fourth embodiment of the present invention; FIG. 14 is a view illustrating the operation of a fixing support jig according to a fourth embodiment of the present invention; FIG. 11 is a view corresponding to FIG. 6 of a fixing support jig according to a third embodiment of the present invention. FIG. 12 is a view corresponding to FIG. 6 of a modified example of the fixing support jig according to the first embodiment of the present invention. FIG. 13 is a view of a fixing support jig according to a fifth embodiment of the present invention. FIG. 14 is a view of a fixing support jig according to a fifth embodiment of the present invention. FIG. 15 is a view of a fixing support jig according to a fifth embodiment of the present invention. FIG. 16 is a view corresponding to FIG. 2 of a fixing support jig according to a sixth embodiment of the present invention. FIG. 17 is a view of a fixing support jig according to a sixth embodiment of the present invention. FIG. 18 is a cross-sectional view of a fixing support jig according to the sixth embodiment of the present invention.

[0065] D Head diameter F Music stand L1 Leg length L2 Leg length 10 Fixed support jig X1 Inner tube X2 Outer tube 12 Tubular base 13 Outer peripheral surface 14 Pressing body 15 Outer peripheral surface 16 Fastening screw portion 17 Annular shoulder 18 Leg 19 Inner peripheral surface 20 Pressing end surface 21 Outer peripheral surface 22 Load-receiving surface 24 Clear hole 25 Projection 26 Male threaded portion 28 One end 32 Slit through hole 34 Female threaded portion 36 Female threaded portion 38 Set screw 40 End peripheral surface 42 Opening 60 Contact portion 62 Contact surface 100 Music stand stand 106 Tripod portion 300 Pressing lever mechanism 301 Pressing lever 302 Pivot 303 Grip lever portion 304 Pin 308 Rotating portion 310 Space 312 Curved peripheral surface 314 Ring plate 333 Hollow sleeve 335 Male thread portion 337 Female thread portion

Claims

1. A fixing support jig that is interposed between an inner tube and an outer tube, at least one of which has a circular cross section, both of which extend in the vertical direction and fit together, and that fixes and supports a heavy object at a predetermined height, the fixing support jig having a through hole on its outer peripheral surface and a tubular base portion that can be fitted onto the outer peripheral surface of one end of the outer tube, the tubular base portion comprising a first fitting portion that extends from said one end toward the outer tube and fits onto the outer tube, with its inner peripheral surface facing the outer peripheral surface of the outer tube with a first predetermined clearance, and a second fitting portion that extends from said one end toward the inner tube and fits onto the inner tube, with its inner peripheral surface facing the outer peripheral surface of the inner tube with a second predetermined clearance, the fixing support jig further comprising a pressing load receiving portion having a pressing load receiving surface, a pressing body having a pressing end surface that can be pressed against the outer peripheral surface of the inner tube, and a pressing load applying portion that applies a pressing load to the pressing load receiving portion, a fixing support jig characterized in that, when a heavy object is supported by either the inner or outer tube, the fitting position of the inner tube relative to the outer tube is adjusted according to the predetermined height of the heavy object, and then the pressing load applying portion presses the pressing body toward the inner tube via the pressing load receiving surface through the through hole of the tubular base portion set at a desired rotational position centered on the longitudinal direction of the inner and outer tubes, thereby bringing the pressing end surface into surface contact with the outer peripheral surface of the inner tube, and pressing and fixing the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing end surface with the inner tube against the inner peripheral surface of the outer tube or the inner peripheral surface of the tubular base.

2. A fixing support jig that is interposed between an inner tube and an outer tube, at least one of which has a circular cross section, both of which extend in the vertical direction and fit together, and that fixes and supports a heavy object at a predetermined height, comprising: a tubular base portion that is attached and fixed to the outer surface of one end of the outer tube, and that has a female screw portion and a pair of through holes sandwiched between the female screw portion on its outer surface; the tubular base portion is composed of a first outer fitting portion that extends from said one end toward the outer tube and fits onto the outer tube, with its inner surface facing the outer surface of the outer tube with a first predetermined clearance; and a second outer fitting portion that extends from said one end toward the inner tube and fits onto the inner tube, with its inner surface facing the outer surface of the inner tube with a second predetermined clearance, one of the pair of through holes being provided in the first outer fitting portion and the other of the pair of through holes being provided in the second outer fitting portion, The device further comprises a pressing body having a pressing load receiving portion having a generally U-shaped vertical cross section and having a pressing load receiving surface with a clearance hole provided therein, and a pair of legs spaced apart from each other in the extension direction of the pressing load receiving portion; and a fastening screw portion that can be pressed and fixed to the pressing load receiving portion and has a male screw portion that can be screwed into the female screw portion, one of the pair of legs having a pressing end surface that can be pressed against the outer circumferential surface of the inner tube, and the other having a pressing end surface that can be pressed against the outer circumferential surface of the outer tube, a clamping screw portion for passing through the clearance hole and threading the male threaded portion into the female threaded portion; a clamping screw portion for passing through the through hole of the first outer fitting portion, the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing end face with the inner tube, and the inner peripheral surface of the inner tube opposite the surface contact portion of the pressing end face with the inner tube, against the inner peripheral surface of the outer tube or the tubular base portion; and a clamping screw portion for passing through the through hole of the second outer fitting portion, the clamping screw portion for passing through the clearance hole of the inner tube and threading the male threaded portion into the female threaded portion.

3. A fixing support jig as described in claim 1, wherein the one end of the outer tube is provided with a male thread, and the inner surface of the tubular base portion is provided with a female thread that can be threaded onto the male thread.

4. A fixing support jig as set forth in claim 3, wherein the other pressing end surface has a complementary shape that fits closely to the threaded portion of the outer tube.

5. A fixed support jig as described in claim 2, wherein each end of the pressing load receiving portion is provided with a leg extending in the opposite direction from the pressing load receiving surface, the tip of the leg has the pressing end surface, and the length from the pressing load receiving surface of each leg to the pressing end surface is set in accordance with a first predetermined clearance and a second predetermined clearance.

6. A fixing support jig as described in claim 2, in which the other of the pair of pressing bodies is passed through the through hole of the second outer fitting portion, and the corresponding pressing end surface is brought into surface contact with the outer peripheral surface of the outer tube, while the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing end surface with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube or the tubular base portion.

7. A fixing support jig as claimed in claim 5, wherein the length of each leg is set so that the pressing end surface contacts each outer peripheral surface simultaneously when the fastening screws are tightened.

8. A fixing support jig as described in claim 1 or claim 2, wherein the inner diameter of the second outer fitting portion is set smaller than the inner diameter of the first outer fitting portion, and an annular shoulder portion is formed at the connection portion between the first outer fitting portion and the second outer fitting portion, and the annular shoulder portion is placed on one peripheral end of the outer tube.

9. A fixing support jig as claimed in claim 1 or claim 2, wherein the pressing end surface has a hardness such that it does not deform when pressed against the outer circumferential surface of the inner tube, and the pressing end surface is formed so as to fit along the outer circumferential surface of the inner tube.

10. A fixing support jig as described in claim 1 or claim 2, wherein the inner tube and the outer tube are each cylindrical, and the outer surface of the inner tube is pressed and fixed against the inner surface of the outer tube by pressing and fixing the outer surface of the inner tube opposite the pressing and fixing portion by the pressing end face against the inner surface of the outer tube in a line contact manner in the vertical direction, and the outer tube is fixed and supported against the inner tube by support at three points.

11. A fixing support jig as described in claim 1 or claim 2, wherein the fastening screw portion has a shank portion and the male screw portion extending downward from the underside of the shank portion, the underside forming an annular surface surrounding the male screw portion, and by threading the male screw portion into the female screw portion through the clearance hole, the underside of the shank portion comes into contact with the pressing load receiving surface of the pressing body, and the fastening screw portion and the pressing body are integrally pressed and fixed to the inner tube and screwed and fixed to the outer tube.

12. A fixing support jig as described in claim 11, wherein the tightening screw portion has a head portion at the end of the shank portion opposite the end of the male screw portion that can be held and rotated by fingers.

13. A fixed support jig as described in claim 1 or claim 2, wherein the fixed support jig is made of metal, the pair of through holes are spaced apart from each other in the longitudinal direction of the inner and outer tubes at a predetermined interval and extend circumferentially of the inner and outer tubes, and a heavy object is supported at a predetermined height by either the inner or outer tube.

14. A fixed support jig as described in claim 5, wherein the difference between the length of one of the legs and the length of the other of the legs is set according to the thickness of the outer tube and the difference between the first predetermined clearance and the second predetermined clearance.

15. A fixing support jig as claimed in claim 1 or 2, wherein the fastening screw prevents rotation of the tubular base and fixes and holds the inner and outer tubes in a predetermined fitted position.

16. In the pressing body near the end of the fitting portion between the outer tube and the inner tube of the outer tube, an insertion hole is provided in the thickness direction of the pressing body from the side closest to the end of the outer tube out of a pair of opposing side surfaces constituting the pressing body, and a circular cross-sectional elongated hole having a circular opening on the end surface and extending through to the side closest to the end of the outer tube is provided in the end surface of the outer tube on the fitting portion side, and the device further has an insertion rod that can be inserted into the elongated hole from the circular opening, and by inserting the pair of pressing bodies into the pair of through holes, the elongated hole communicates with the insertion hole, and by inserting the tip end of the insertion rod into the insertion hole, the pair of pressing bodies are held within the pair of through holes, the elongated hole has a female screw portion, and the insertion rod is a set screw that can be screwed into the female screw portion of the elongated hole, and the tip end of the set screw is inserted into the insertion hole while screwing into the elongated hole.

3. The fixing support jig according to claim 1, wherein the pair of pressing bodies are detachably held in the pair of through holes by being inserted into the through holes.

17. A music stand having the fixing support jig according to claim 1 or 2, which supports a music stand, musical instrument, microphone or amplifier by the end of the inner tube or outer tube opposite the fitting portion of the inner and outer tube.

18. A method for fixing and supporting inner and outer tubes, comprising the steps of: fitting a tubular base having an inner circumferential surface with a circular cross section onto the upper end of the outer tube; fitting the inner tube into the tubular base or the outer tube; rotating the tubular base to a desired rotational position around the longitudinal direction of the outer tube; and pressing the tubular base from the outside toward the outer surface of the inner tube in the thickness direction of the tubular base, thereby fixing the tubular base at the desired rotational position around the longitudinal direction of the outer tube, while pressing the outer surface of the opposite side of the inner tube against the inner surface of the tubular base or the outer tube, thereby fixing and holding the inner and outer tubes together in the longitudinal direction.

19. A method for fixing and supporting inner and outer tubes as claimed in claim 18, further comprising the step of fixing the tubular base at a desired rotational position around the longitudinal direction of the outer tube by pressing the tubular base from the outside toward the outer surface of the outer tube in the thickness direction of the tubular base, while pressing the outer surface of the opposite side of the outer tube against the inner surface of the tubular base, thereby fixing and holding the inner and outer tubes together in the longitudinal direction.

20. A method for fixing and supporting inner and outer tubes as described in claim 19, wherein the inner peripheral surface of the tubular base is provided with a reduced diameter section set larger than the diameter of the inner tube and an expanded diameter section set larger than the diameter of the outer tube, and an annular shoulder section is formed at the connection between the reduced diameter section and the expanded diameter section, and the annular shoulder section is placed on the annular upper end surface of the outer tube, and the tubular base is rotated to a desired rotational position around the longitudinal direction of the outer tube.

21. A method for fixing and supporting inner and outer tubes as described in claim 20, wherein the U-shaped pressing body is provided with a pair of legs having pressing end faces at their tips that press against the outer circumferential surfaces of the inner and outer tubes from the outside of the tubular base in the thickness direction of the tubular base, and the outer circumferential surface of the tubular base is provided with a pair of through slits through which the pressing end faces can pass, and the length of each of the legs is selected according to the diameter of the inner and outer tubes and the width of the annular shoulder portion.

22. A medical stand having the fixing support jig described in claim 1 or claim 2, wherein casters are provided at the end of the inner tube or the outer tube opposite the fitting portion of the inner and outer tube, making it movable, and wherein the end of the outer tube or the inner tube opposite the fitting portion of the inner and outer tube supports an IV drip, a monitor, and lighting.

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