Manufacturing method for integrated structure of inner and outer pipes, integrated fixing and holding jig for inner and outer pipes, and inclination angle adjusting jig

Abstract

 Provided is a manufacturing method for an integrated structure of inner and outer pipes that is characterized by including a step in which, with respect to an inner pipe (12) and an outer pipe (14) that engage, the outer pipe is processed so as to have a pair of though slits (18) and a female screw section (72), and a step in which: prepared is a pressing part (22) that has a U-shaped cross-section, that can be pressed against the inner pipe at two locations by passing through the pair of through slits, and that includes a clearance hole (32), and prepared is a tightening screw part (24) equipped with a male screw section (26) that can threadedly engage with the female screw section and also equipped with a torque imparting grip (132); at a prescribed engagement position, the male screw section is threadedly engaged with the female screw section via the clearance hole by means of tightening the tightening screw part with manual strength via the torque imparting grip, and the pressing part is pressed and fixed with respect to the inner pipe and the inner pipe is pressed and fixed with respect to the outer pipe, thereby configuring an inner and outer pipe overall length adjusting jig, an inclination angle adjusting jig that adjusts through adjustment of the engagement position of the inner pipe and the outer pipe, or a stand-facing fixing and holding jig that fixes and holds a heavy object; and as a result of the foregoing, the inner pipe and outer pipe are integrally fixed in the length direction of the pipes.

Description

Manufacturing method for integral structure of inner and outer pipes, integral fixing holding jig for inner and outer pipes, and tilt angle adjusting jig

[0001] The present invention relates to a method for manufacturing an integrated structure of inner and outer pipes, a fixture for fixing and holding the inner and outer pipes together, and an inclination angle adjustment jig. More specifically, the present invention relates to a method for manufacturing an integrated structure of inner and outer pipes that includes a fixture support jig that can firmly support the structure using only manual force, and an inclination angle adjustment jig that has a simple structure and can adjust the predetermined inclination angle orientation of a heavy object by adjusting the fitting position of the inner pipe and the outer pipe with easy operation without requiring excessive tightening force.

[0002] Conventionally, inner and outer tube components whose overall length can be adjusted by adjusting the fitting length of the inner and outer tubes fitted together have been used for a variety of purposes, such as stands for supporting household items at a desired height, clothes drying poles, vacuum cleaner suction tubes, and bicycle saddle height adjustment. Such adjustable-length inner and outer tube components are typically manually adjusted to adjust the length of a stand, the length of a pole depending on the number of laundry loads, or the height of a saddle. More specifically, the outer peripheral surface of one end of the inner tube is fitted onto the inner peripheral surface of the outer tube through an opening at one end. After adjusting the fitting length as needed, a fastening screw having a male thread that threads into a female thread in a circular through-hole provided on the outer peripheral surface of the outer tube is rotated, causing the tip of the male thread to abut against the outer peripheral surface of one end of the inner tube, tightening and fixing the fitting length. In some cases, such tightening and fixing makes it possible to position the inner and outer tubes vertically, support heavy objects using the inner or outer tube, and hold the heavy objects at a predetermined height, thereby utilizing the inner and outer tubes as a stand.

[0003] However, such conventional length adjustment jigs for inner and outer pipe members have the following technical problems. First, even if it is possible to adjust the length of the inner and outer pipe members, maintaining the adjusted length of the inner and outer pipe members is insufficient. More specifically, since the fastening screw is screwed into the female thread of the outer pipe by rotating the male thread around the longitudinal direction, even if the tip of the fastening screw is shaped to follow the curved shape of the outer peripheral surface of the inner pipe, depending on the rotational position of the tip when it contacts the outer peripheral surface of the inner pipe, the tip of the fastening screw and the outer peripheral surface of the inner pipe may only come into surface contact by chance. When the inner and outer pipes have curved outer peripheral surfaces, such as those with circular cross sections, the tip of the fastening screw and the outer peripheral surface of the inner pipe will only come into point or line contact, resulting in insufficient fixation and retention of the inner pipe relative to the outer pipe, making it difficult to maintain the length of the inner and outer pipe members.

[0004] Second, when used as a stand to support a heavy object, the tightening force tends to be insufficient, causing the engagement to suddenly come loose, resulting in the heavy object falling. More specifically, the weight of a heavy object is supported by the frictional force between the tip of the male thread of the fastening screw and the outer surface of the inner tube when the fastening screw is engaged. The resistance of the tip of the male thread against the outer surface of the inner tube, which constitutes part of the frictional force, can decrease over time due to loosening of the screws, etc. However, when supporting a heavy object, such as a stand, tightening multiple fastening screws individually to compensate for insufficient fastening force is time-consuming, labor-intensive, inconvenient, and impractical. Furthermore, when attempting to ensure sufficient tightening force, the tip of the male thread may leave a mark or dent on the outer surface of one end of the inner tube, causing functional and aesthetic degradation. In particular, in the case of resin inner and outer tubes, excessive tightening force can cause cracks or breakage on the outer surface of the inner tube.

[0005] Thirdly, for example, when the inner and outer pipes oriented in the vertical direction are themselves relatively long and need to support a heavy object, if the pipes are thick, particularly the outer pipe, the male thread portion must penetrate the thickness of the outer pipe to reach the outer surface of the inner pipe, which naturally requires a longer male thread portion, which requires more time and effort to screw in, making it inconvenient and impractical. As described above, even if the fitting length of the inner and outer pipes can be adjusted by screwing the fastening screw into the outer pipe from the outer surface side and fixing the tip portion to the outer surface of the inner pipe, this can only be said to be useful in very limited applications, including the practicality of adjusting the fitting length of the inner and outer pipes itself.

[0006] In this regard, a known length adjustment jig for inner and outer pipe members adjusts the length of an inner or outer pipe member by providing a pair of overhanging flanges on the outer pipe facing each other in the longitudinal direction of the pipe, and tightening threads onto female threads on each overhanging flange to narrow the clearance between the pair of overhanging flanges, thereby pressing the inner circumferential surface of the outer pipe against the outer circumferential surface of the inner pipe. With this type of length adjustment jig for inner and outer pipe members, the inner circumferential surface of the outer pipe is pressed against the outer circumferential surface of the inner pipe without the tip of the threads contacting the outer circumferential surface of the inner pipe. However, it is difficult to obtain sufficient tightening force from the threads. More specifically, the threads have a head portion and a male thread portion extending from the head portion. Turning the head portion with fingers applies tightening force. However, because the head portion is located near the outer surface of the outer pipe, it is difficult to expand the diameter. Turning the head portion requires grasping it with fingers rather than gripping it with a hand, making it difficult to apply force. By providing a long shank portion on the threaded portion, it is possible to move the head portion away from the outer surface of the outer tube and enlarge the diameter, but this is not aesthetically pleasing and is not desirable from a design perspective.

[0007] Furthermore, a length adjustment jig for inner and outer pipe members is known in which, similar to the above, a screw having a male thread is screwed into the female thread of the outer pipe to adjust the length of the inner and outer pipe members, but in which an outwardly protruding portion is provided on the outer pipe, a spacer is placed in the internal space formed by the protruding portion, and the outer pipe is fixed to the outer surface of the inner pipe by the tightening force of the screw via the spacer. With this length adjustment jig for inner and outer pipe members, the inner surface of the outer pipe is indirectly pressed against the outer surface of the inner pipe without the tip of the threaded portion directly contacting the outer surface of the inner pipe. However, as with the above, the provision of an outwardly protruding portion on the outer pipe cannot be processed by lathe machining, so a processing method such as lost wax casting is required, and the appearance is unattractive and undesirable from a design perspective.

[0008] The above points are technical problems that apply not only to length adjustment jigs for inner and outer pipe fitting members and heavy load support jigs using inner and outer pipe fitting members, but also to tilt angle adjustment jigs that use inner and outer pipe fitting members to rotatably connect the inner and outer pipes via a pivot and adjust the relative tilt angle by adjusting the fitting position of the inner and outer pipes. Here, the jig that adjusts the position of the fitting portion of the inner and outer tubes and fixes and holds the fitting portion is one element of the integrated structure of the inner and outer tubes, and when viewed from the perspective of the inner and outer tubes as a whole, it is also a length adjustment jig for the overall length of the inner and outer tubes.In that the inner and outer tubes are fixed and held as a single unit in the longitudinal direction of the tubes, it is also a fixture for fixing and holding the inner and outer tubes as a unit.When the inner and outer tubes are oriented vertically and either the inner or outer tube supports a heavy object, it is also a fixture and support jig for the inner and outer tubes.It is clear that, depending on the application, the integrated structure of the inner and outer tubes can be used as a general stand for music-related or medical-related purposes, a structural frame for mobile objects such as bicycles and carts, a framework frame for temporary tents, temporary construction scaffolding, a walking stick, a fork, a brace for earthquake countermeasures, etc.

[0009] In view of the above technical problems, an object of the present invention is to provide a manufacturing method for an integrated structure of inner and outer pipes, and a jig for fixing and holding the inner and outer pipes together, which includes a fixing support jig that can firmly support the structure using only manual force.In view of the above technical problems, an object of the present invention is to provide a manufacturing method for an integrated structure of inner and outer pipes, and a jig for fixing and holding the inner and outer pipes together, which allows the overall length of the inner and outer pipes to be adjusted with a simple structure and easy operation.In view of the above technical problems, an object of the present invention is to provide a manufacturing method for an integrated structure of inner and outer pipes, and a jig for fixing and holding the inner and outer pipes together, which allows the height position of a heavy object to be adjusted by adjusting the overall length of the inner and outer pipes with a simple structure and easy operation when supporting the heavy object at a predetermined height through the fitting structure of the inner and outer pipes. In view of the above technical problems, the object of the present invention is to provide a method for manufacturing an integrated structure of inner and outer tubes, and a fixture for fixing and holding the inner and outer tubes together, which has a simple structure and is easy to operate, and which allows the predetermined inclination angle of a heavy object to be adjusted by adjusting the fitting position of the inner and outer tubes when a heavy object is supported at a predetermined inclination angle by either the inner or outer tube through the fitting structure between the inner and outer tubes.

[0010] In order to achieve the above object, the method for manufacturing an integrated structure of inner and outer pipes of the present invention comprises the steps of: machining, 3D printer modeling, or lost wax processing a pair of through slits and a female screw portion on the outer surface corresponding to the fitting portion of a solid or hollow inner pipe and a hollow outer pipe that fit together; and preparing a pressing portion with a U-shaped side cross section that penetrates the pair of through slits from outside the outer surface and can be pressed against the outer circumferential surface of the inner pipe in a tight contact manner by surface contact at two points, the pressing portion having a clearance hole, and a tightening screw portion equipped with a female screw portion that can be screwed into the female screw portion and a torque applying grip that applies rotation around the extension direction of the male screw portion, and selecting the diameter of the torque applying grip according to the support load so that it can be firmly supported by hand force alone; At a predetermined fitting position, the tightening screw portion is tightened by hand using a torque-applying grip, thereby threading the male thread portion into the female thread portion through the clear hole, thereby pressing and fixing the pressing portion toward the outer peripheral surface of the inner tube in a surface contact manner against the outer peripheral surface of the inner tube, and pressing and fixing the outer peripheral surface of the inner tube on the side opposite to the surface contact portion of the pressing portion with the inner tube against the inner peripheral surface of the outer tube, thereby forming an overall length adjustment jig for the inner and outer tubes, or an inclination angle adjustment jig that rotatably connects the inner and outer tubes via a pivot and adjusts the fitting position of the inner and outer tubes, or an inner and outer tube integral fixing and holding jig that fixes and holds the inner and outer tubes together, or a fixing and support jig for a stand that supports and fixes a heavy object with either the inner or outer tube, and completing the step of fixing the inner and outer tubes together in the longitudinal direction of the tubes.

[0011] According to the manufacturing method for an integrated structure of inner and outer tubes having the above-mentioned configuration, when preparing the inner and outer tubes that fit together, the pressing portion having a clearance hole, and the tightening screw portion having a female screw portion that can be screwed into the female screw portion and a torque application grip, the diameter of the torque application grip is selected according to the support load that is determined depending on the application of the integrated structure of the inner and outer tubes as a length adjustment jig, an inclination angle adjustment jig, or a fixed support jig for a stand, and at a predetermined fitting position of the inner and outer tubes, the tightening screw portion is tightened by hand via the torque application grip, thereby threading the male screw portion into the female screw portion via the clearance hole, and the pressing portion is pressed and fixed in a surface contact manner against the outer peripheral surface of the inner tube. By pressing and fixing the outer surface of the inner tube opposite the surface contact portion of the pressing portion with the inner tube against the inner surface of the outer tube, it is possible to construct an overall length adjustment jig for the inner and outer tubes, or an inclination angle adjustment jig that rotatably connects the inner and outer tubes via a pivot and adjusts the fitting position of the inner and outer tubes, or an inner and outer tube integral fixing and holding jig that fixes and holds the inner and outer tubes together, or a fixed support jig for a stand that supports and fixes a heavy object with either the inner or outer tube, and by completing the process by fixing the inner and outer tubes together in the longitudinal direction of the tubes, it is possible to provide a manufacturing method for an integrated structure of inner and outer tubes that can firmly support the inner and outer tubes together using only manual force, depending on various applications.

[0012] In order to achieve the above object, the inclination angle adjustment jig of the present invention comprises: a tubular portion having a female screw portion and at least one through hole within a predetermined range from the female screw portion on its outer surface; a first support bar extending at a fixed predetermined angle with respect to the extension direction of the tubular portion and having a grounded lower end; a pivot connecting the upper end of the first support bar to the tubular portion, the upper end of the first support bar being connected and fixed to the tubular portion so as to be rotatable around the pivot; a second support bar slidably fitted within the tubular portion, extending along the extension direction of the tubular portion and having a grounded lower end; at least one pressing portion passing through the through hole from the outer surface of the tubular base portion and abutting against the outer surface of the second support bar; and a tightening screw portion capable of pressing and fixing the pressing portion against the outer surface of the second support bar, the tip surface of the pressing portion being shaped to follow the outer surface of the second support bar so as to be in surface contact with the outer surface of the second support bar, The clamping screw portion has a male thread portion that can be threaded into the female thread portion, and the pressing portion has a clear hole through which the male thread portion can pass. By moving the first support bar within the plane formed by both support bars so that the distance between the lower ends of both support bars changes, the upper end of the first support bar rotates around the pivot axis relative to the tubular portion while adjusting the fitting position of the tubular base portion relative to the second support bar, and then the clamping screw portion screws the male thread portion into the female thread portion via the clear hole, while the pressing portion passes through the through hole and presses and fixes the tip end surface against the outer peripheral surface of the second support bar in a surface contact manner, thereby making it possible to adjust the inclination angle of the second support bar relative to the ground surface.

[0013] According to the tilt angle adjustment jig having the above configuration, there is a second support bar that is fitted into the tubular portion so as to be movable in the longitudinal direction of the tube, and a first support bar that is connected to the tubular portion via a pivot and is rotatable around the pivot, and the outer surface of the tubular portion is provided with a female screw portion and at least one through hole within a predetermined range from the female screw portion, and there is at least one pressing portion that passes through the through hole from the outer surface of the tubular base portion and abuts the outer surface of the second support bar, and a tightening screw portion that can press and fix the pressing portion against the outer surface of the second support bar, and the tip surface of the pressing portion is shaped to follow the outer surface of the second support bar so as to be in surface contact with the outer surface of the second support bar. The clamping screw has a male thread that can be threaded onto the female thread, and the pressing portion has a clearance hole through which the male thread can pass, so that by moving the first support bar within the plane formed by the two support bars so as to change the distance between the lower ends of the two support bars, the upper end of the first support bar rotates about the pivot relative to the tubular portion while adjusting the engagement position of the tubular base portion with the second support bar, and then the clamping screw threads the male thread into the female thread through the clearance hole, while the pressing portion passes through the through hole and presses and fixes the tip end surface against the outer circumferential surface of the second support bar in a surface-to-surface contact manner, thereby enabling adjustment of the inclination angle of the second support bar with respect to the ground surface (e.g., the inclination angle of a rectangular surface when a rectangular heavy object is supported by the second support bar) with a simple structure and easy operation without requiring excessive clamping force. Furthermore, the clamping screw may have a male thread, and the outer tube may have a female thread that can be threaded onto the male thread.

[0014] Furthermore, each of the tubular portions further has a pair of opposing overhanging flanges that overhang from its outer surface in a direction intersecting the extension direction of the tubular portion, and each of the pair of overhanging flanges has a first through hole that can receive the corresponding end of the pivot shaft, and the upper end of the first support bar is provided with a second through hole that can pass through the pivot shaft in a direction intersecting the extension direction of the first support bar, and the upper end of the first support bar is positioned between the pair of overhanging flanges so that the first through hole and the second through hole are aligned, and the pivot shaft is provided to pass through each of the first through holes and the second through hole.

[0015] Furthermore, the tilt angle adjustment device according to claim 1 may be provided as a pair so that the planes formed by both support bars are parallel, and each of the opposing edges of a rectangular plate-shaped heavy object may be supported by the second support bar of each of the tilt angle adjustment devices, and supported at four points by the lower ends of the first support bar and the second support bar of each of the tilt angle adjustment devices, and the tilt angle of the rectangular surface of the rectangular plate-shaped heavy object may be adjusted by adjusting the fitting position of the tubular base part of each of the tilt angle adjustment devices with the corresponding second support bar, thereby adjusting the tilt angle of the corresponding second support bar of each of the tilt angle adjustment devices.

[0016] In order to achieve the above object, the method for manufacturing an integrated structure of inner and outer tubes of the present invention includes the steps of: machining, 3D printer modeling, or lost wax processing a pair of through slits on the outer surfaces of a solid or hollow inner tube and a hollow outer tube that fit together, the outer surfaces corresponding to the fitting portions of the outer tube; and preparing a press plate having a load receiving surface that receives a load toward the inner tube and a pair of pressing bodies that extend from the surface opposite the load receiving surface toward the opposite side of the load receiving surface, each of the pair of pressing bodies having a pressing surface at its tip that can abut against the outer peripheral surface of the inner tube, wherein the inner or outer surface of the corresponding through slit forms a guide surface for each of the pair of pressing bodies, thereby allowing each of the pair of pressing bodies to be press-fitted, and a first angle of each of the pair of pressing bodies relative to the load receiving surface in the extension direction toward the tip is set to be different from a second angle of the extension direction of the corresponding through slit relative to the outer peripheral surface of the inner tube, the bending rigidity at the tip end of each of the pair of pressing bodies is set in accordance with the material of the pressing plate, the length to the tip end of each of the pair of pressing bodies, and the area of ​​each of the pressing surfaces, so that the first angle can be changed by deforming each of the pair of pressing bodies using manual force and the pressing bodies can be press-fitted into the corresponding through slit; At a predetermined fitting position, the pressing portion is pressed and fixed by hand toward the outer peripheral surface of the inner tube in a surface contact manner, and the outer peripheral surface of the inner tube on the opposite side of the surface contact portion of the pressing portion with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube, thereby forming an overall length adjustment jig for the inner and outer tubes, or an inclination angle adjustment jig that rotatably connects the inner and outer tubes via a pivot and adjusts the fitting position of the inner and outer tubes, or an inner and outer tube integral fixing and holding jig that fixes and holds the inner and outer tubes together, or a fixed support jig for a stand that supports and fixes a heavy object with either the inner or outer tube, and then completing the step of fixing the inner and outer tubes together in the longitudinal direction of the tubes.

[0017] The pressing plate may have a U-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits may have a V-shaped cross section along the extension direction of the inner and outer tubes. Furthermore, the pressing plate may have a U-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits may have a curved V-shaped cross section along the extension direction of the inner and outer tubes. Furthermore, the pressing plate may have a V-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits may have a U-shaped cross section along the extension direction of the inner and outer tubes. In addition, the pressing plate may have a curved V-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits may have a U-shaped cross section along the extension direction of the inner and outer tubes. The pressing plate may have a V-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits may have a V-shaped cross section along the extension direction of the inner and outer tubes. Furthermore, the pressing plate may have a U-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits may have U-shaped cross sections along the extension direction of the inner and outer tubes.

[0018] Furthermore, the pair of pressing bodies are configured in a direction that intersects with each other, and for either one or both of the pressing bodies, the bending rigidity at the tip of the pressing body is preferably set in accordance with the material of the pressing plate, the length to the tip of each of the pair of pressing bodies, and the area of ​​each pressing surface so that the first angle can be changed by deforming each of the pair of pressing bodies using manual force, and the pressing body can be pressed into the corresponding through slit.

[0019] In order to achieve the above object, the fixture for holding an inner and outer pipe together of the present invention comprises: a pressing plate having a load receiving surface that receives a load directed toward the inner pipe when the outer pipe is fitted onto the inner pipe so as to be movable relative to the inner pipe in the longitudinal direction of the pipe; and a pair of pressing bodies that each extend from the surface opposite the load receiving surface toward the opposite side of the load receiving surface, each of the pair of pressing bodies having a pressing surface at its tip that can come into contact with the outer circumferential surface of the inner pipe; each of the outer pipes has a pair of through slits that penetrate the thickness direction and through which one of the pair of pressing bodies can pass; the pair of pressing bodies are spaced apart from each other so that at least a part of each pressing surface is located within an opening formed in the outer circumferential surface of the outer pipe of the corresponding through slit; and the inner circumferential surfaces of the through slits corresponding to each of the pair of pressing bodies form guide surfaces for each of the pair of pressing bodies, so that each of the pair of pressing bodies can be press-fitted, and a first angle of each of the pair of pressing bodies in the extension direction to the load receiving surface toward the tip end is set to be different from a second angle of the extension direction of the corresponding through slit with respect to the outer circumferential surface of the inner pipe so that The bending rigidity at the tip of each of the pair of pressing bodies is set according to the material of the pressing plate, the length to the tip of each of the pair of pressing bodies and the area of ​​each pressing surface so that the first angle can be changed by deforming each of the pair of pressing bodies using manual force, and they can be pressed into the corresponding through slits.As a result, when a load is applied, the pressing surface abuts against the outer peripheral surface of the inner tube, making it impossible for the outer tube to move relative to the inner tube in the longitudinal direction of the tube, and when the load is released, the outer tube can move relative to the inner tube in the longitudinal direction of the tube, but the pair of pressing bodies are pressed into and held in the pair of through slits by their elastic restoring force to their original shape.

[0020] In order to achieve the above object, the fixture for fixing and holding an inner and outer tube together of the present invention is a fixture for fixing and holding an inner and outer tube, which is interposed between an inner tube and an outer tube that are fitted together to fix and hold the inner and outer tubes, the outer surface of the outer tube being provided with a pair of through slits spaced apart from each other, and at least one pressing portion that passes through the through slit from the outer peripheral surface of the outer tube and abuts against the outer peripheral surface of the inner tube, the pressing portion having a pair of pressing bodies spaced apart from each other and capable of pressing against the outer peripheral surface of the inner tube by surface contact at two points, and a load receiving surface that presses the pair of pressing bodies toward the outer peripheral surface of the inner tube, each of the pair of pressing bodies having a pressing end surface that can be pressed against the outer peripheral surface of the inner tube, and the pressing body of the pair of pressing bodies that is closer to the end of the outer tube on the fitting portion side between the outer tube and the inner tube has an insertion hole that is formed in the thickness direction of the pressing body from the side that is closer to the end of the outer tube out of a pair of opposing side surfaces that make up the pressing body, The end face of the outer tube on the fitting side has a circular opening on the end face and a circular cross-section extending through to the side face closer to the end of the outer tube, and the outer tube further has an insertion rod insertable from the circular opening into the elongated hole, and by inserting the pair of pressing bodies into the pair of through slits, 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 in the pair of through slits. Also, the elongated hole has a female threaded portion, and the insertion rod is a set screw that can be threaded into the female threaded portion of the elongated hole, and by inserting the tip end of the set screw into the elongated hole while threading it, the pair of pressing bodies are detachably held in the pair of through slits.

[0021] Furthermore, it is preferable that the first elongated hole has an elliptical cross section elongated vertically in the direction of movement of the pressing body so that the pressing body can move within a predetermined range when the set screw is inserted into the insertion hole. Furthermore, it is preferable that the female thread portion is provided in the elongated hole from the vicinity of the side surface close to the end of the outer tube to the side surface.

[0022] In order to achieve the above object, the fixture for fixing and holding an inner and outer tube together of the present invention is a fixture for fixing and holding an inner and outer tube, which is interposed between an inner tube and an outer tube that are fitted together, and which fixes and holds the inner and outer tubes, the outer surface of the outer tube being provided with a pair of through slits spaced apart from each other, and at least one pressing portion that passes through the through slit from the outer peripheral surface of the outer tube and abuts against the outer peripheral surface of the inner tube, the pressing portion having a pair of pressing bodies spaced apart from each other and capable of pressing against the outer peripheral surface of the inner tube by surface contact at two points, and a load receiving surface that presses the pair of pressing bodies against the outer peripheral surface of the inner tube, each of the pair of pressing bodies having a pressing end surface that can be pressed against the outer peripheral surface of the inner tube, and further having a pressing lever having an annular peripheral surface that rotates around an axis parallel to the load receiving surface while abutting against the load receiving surface, The annular peripheral surface is curved such that the radius from the axis increases from a first radius to a second radius, and the pair of pressing bodies can move in the thickness direction of the slit within the corresponding through slit by rotating the pressing lever around an axis provided at a predetermined height from the outer peripheral surface of the outer tube, and by rotating the pressing lever around an axis provided at a predetermined height from the outer peripheral surface of the outer tube, the pressing bodies start pressing toward the outer peripheral surface of the inner tube at a rotational position corresponding to an intermediate radius between the first radius and the second radius, and finish pressing toward the outer peripheral surface of the inner tube at a rotational position corresponding to the second radius, so that the pressing end surface is brought into surface contact with the outer peripheral surface of the inner tube, and the outer peripheral surface of the inner tube opposite to the surface contact portion of the pressing end surface with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube.

[0023] The pair of through slits may be provided in a tubular base portion attached and fixed to the outer peripheral surface of one end of the outer tube, and the inner tube may be fitted to the outer tube via the tubular base portion. Preferably, the pressing lever further comprises a pin standing upright from the outer peripheral surface of the outer tube or the tubular base portion, and a pivot fixed to the pin and extending parallel to the outer peripheral surface, and the pressing lever has a rotating portion pivotally supported on the pivot shaft and a grip portion extending from the outer edge of the rotating portion, and the rotating portion has the annular peripheral surface that abuts against the load-receiving surface.

[0024] Furthermore, it is preferable that the rotating part be pivotally supported on the pivot shaft so that when the pressing lever rotates to a position corresponding to the intermediate radius, the direction connecting the tip of the grip part and the pivot shaft is in a substantially upright position, and when the pressing lever rotates to a position corresponding to the second radius, the direction connecting the tip of the grip part and the pivot shaft is in a pressed-down position. In addition, it is preferable that the rotating part has an annular circumferential surface that has the second radius over a predetermined central angle range with respect to the pivot shaft, depending on the desired pressing force against the outer peripheral surface of the inner tube by the pair of pressing bodies. It is also preferable that the pin is screwed and fixed to the outer peripheral surface of the outer tube or the tubular base, and the height of the pivot shaft can be adjusted by adjusting the screwing amount. Furthermore, it is preferable that the rotating part has a notch in a direction intersecting the pivot axis and includes a pair of rotating parts facing each other with the notch interposed therebetween, the pin is disposed in the notch and has a first through hole through which the pivot axis can pass, and each rotating part has a second through hole through which the pivot axis can pass rotatably, and the first through hole and the second through hole can be aligned and positioned so that the pivot axis can pass through. Furthermore, it is preferable that the annular peripheral surface is elliptical, and the major axis of the ellipse constitutes the second radius.

[0025] Additionally, the music stand may be a stand in which a music stand is fixedly supported by either the inner or outer tube, and a fitting portion between the inner or outer tube or the inner tube and a tubular base portion attached and fixed to the outer peripheral surface of one end of the outer tube has the fixing support jig for the inner or outer tube described in any one of claims 1, 5, 6, 15, 16, and 20. Also, the music stand may be a stand in which a table body is fixedly supported by either the inner or outer tube, and the inner or outer tube or the inner tube and a tubular base portion attached and fixed to the outer peripheral surface of one end of the outer tube form legs of the table body, and a table in which a fitting portion between the inner and outer tubes has the fixing support jig for the inner or outer tube described in any one of claims 1, 5, 6, 15, 16, and 20. Furthermore, the vehicle may have a saddle and / or handlebars fixedly supported on either the inner or outer tube, and a fixing support jig for the inner or outer tube as described in any one of claims 1, 5, 6, 15, 16, and 20 at the fitting portion between the inner or outer tube or the inner tube and a tubular base portion attached and fixed to the outer surface of one end of the outer tube.

[0026] Furthermore, the temporary tent frame may be one in which a three-dimensional framework is formed by fitting a plurality of sets of inner and outer tubes together, and the fitting portion between the inner and outer tubes or the inner tube and a tubular base portion attached and fixed to the outer peripheral surface of one end of the outer tube has the fixing support jig for inner and outer tubes described in any one of claims 1, 5, 6, 15, 16, and 20. Additionally, the temporary tent frame may be one in which a U-shaped portion is fixedly supported at the tip of either the inner or outer tube, and the fixing support jig for inner and outer tubes described in any one of claims 1, 5, 6, 15, 16, and 20 has the fixing support jig for inner and outer tubes described in any one of claims 1, 5, 6, 15, 16, and 20 at the fitting portion between the inner and outer tubes or the inner tube and a tubular base portion attached and fixed to the outer peripheral surface of one end of the outer tube. The cart may have casters on one side of the inner and outer tubes that fit together, and a loading platform on the other side, and may have a fixing support jig for the inner and outer tubes described in any one of claims 1, 5, 6, 15, 16, and 20 at the fitting portion between the inner and outer tubes or the inner tube and a tubular base portion that is attached and fixed to the outer surface of one end of the outer tube.

[0027] A first embodiment of a length adjustment jig 10 of the present invention will be described in detail below with reference to the drawings. As shown in Figures 1 to 6, the length adjustment jig 10 is generally composed of a pressing body 22 interposed between an inner tube 12 and an outer tube 14 that are fitted together, the pressing body 22 having a pressing surface 54 that can be pressed against the outer peripheral surface 15 of the inner tube 12, and a fastening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The length, thickness, and cross-sectional shape of each of the inner tube 12 and the outer tube 14 can be selected depending on the application, and as will be described later, the fitting length between the inner tube 12 and the outer tube 14 is adjusted so that the overall length of the inner tube 12 and the outer tube 14 can be adjusted.

[0028] For example, the inner tube 12 and the outer tube 14 are each hollow cylindrical, and the outer tube 14 is fitted onto the inner tube 12 by inserting the inner circumferential surface 17 of the outer tube 14 from one end opening into one end opening of the outer circumferential surface 15 of the inner tube 12. When the outer tube 14 is fitted onto the inner tube 12, a slight clearance may be provided between the inner circumferential surface 17 of the outer tube 14 and the outer circumferential surface 15 of the inner tube 12, as long as the outer tube 14 is fixed and held longitudinally relative to the inner tube 12 via the clamping screw portion 24 and the pressing body 22, as described below. The slight clearance is, for example, 0.05 mm to 0.1 mm. A pair of through slits 18 are provided on the outer circumferential surface 16 of the outer tube 14, spaced apart by a distance D. A female thread portion 20 is provided between the pair of through slits 18. The distance D between the pair of through slits 18 may be selected depending on the application of the length adjustment jig 10, as described below.

[0029] The pair of through slits 18 are spaced a predetermined distance from each other in the longitudinal direction of the inner and outer tubes 12, 14, and are provided so as to extend in the longitudinal direction of the inner and outer tubes 12, 14. More specifically, each of the pair of through slits 18 is an elongated opening, and the width of the opening need only be such that the pressing portion 22 can pass through in the thickness direction, and since the pressing body is fastened and fixed to the outer tube 14 via the fastening screw portion 24, as will be described later, it is not necessary for the pressing portion 22 to pass through the pair of through slits 18 provided in the outer peripheral surface 16 of the outer tube 14 in an interference fit manner.

[0030] The pressing portions 22 are positioned on the outer peripheral surface 16 of the outer tube 14 and pass through a pair of through slits 18 to abut against the outer peripheral surface 15 of the inner tube 12. More specifically, the male thread portion 26 of the tightening screw portion 24 forms a pressing body 34 having a generally U-shaped vertical cross section, which is provided with a clearance hole 32 that passes through in the thickness direction and two pressing portions 22 that extend in opposite directions from the clearance hole 32. The pressing body 34 has a central portion 48 in which the clearance hole 32 is provided, and each of the pair of pressing portions 22 has an inclined portion 56 that extends downward from the entire corresponding end of the central portion 48, and each of the pair of pressing portions 22 extends from the entire lower end of the inclined portion 56, and a pressing surface 54 is provided on the lower surface 38. Each pressing surface 54, which is the tip surface of the pressing portion 22, is shaped to follow the outer peripheral surface 15 of the inner pipe 12 so as to be in surface contact with the outer peripheral surface 15 of the inner pipe 12. For example, if the outer peripheral surface 15 of the inner pipe 12 is the outer surface of a cylinder, the pressing surface 54 has an arc-shaped cross section with the same diameter. In this case, unlike the fastening screw portion 24, the pressing body 34 itself does not need to be rotated toward the outer peripheral surface 15 of the inner pipe 12, so it is possible to press the pressing surface 54 against the outer peripheral surface 15 of the inner pipe 12 in an orientation such that the arc-shaped cross section matches the outer peripheral surface 15 of the inner pipe 12.

[0031] The pressing body 34 has a protrusion 42 on an upper surface 44, and the protrusion 42 is provided with a clearance hole 32, and by threading the male thread portion 26 into the female thread portion 20, the lower surface 38 of the shank portion 36 comes into contact with the upper surface 44 of the protrusion 42 of the pressing body 34, whereby the fastening screw portion 24 and the pressing body 34 are integrally pressed and fixed to the inner tube 12 and screwed and fixed to the outer tube 14. The pressing body 34 is located above the outer tube 14, and the male thread portion 26 passes through the clearance hole 32 and is tightened against the female thread portion 20, thereby enabling the outer tube 14 to be fixed to the inner tube 12 via the pressing portion 22.

[0032] A contact surface 46 capable of contacting the outer peripheral surface 16 of the outer pipe 14 is provided on the back surface of the central portion 48 of the pressing body 34. More specifically, a flat contact surface 46 is provided around the lower end opening of the undercut hole portion 32, and by screwing the male thread portion 26 into the female thread portion 20 on the outer peripheral surface 16 of the outer pipe 14 with the fastening screw portion 24 until the lower surface of the shank portion 36 contacts the annular surface of the pressing body 34, the pressing surface 54 is tightened and fixed to the outer peripheral surface 15 of the inner pipe 12 with the contact surface 46 in contact with the outer peripheral surface 16 of the outer pipe 14. In this way, the inner and outer pipes 12, 14 are fixed and held at a predetermined fitting length via the fastening screw portion 24 and the pressing body 34.

[0033] The clamping screw portion 24 is configured to be able to press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, 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 able to threadably engage with the female thread portion 20, 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 12 relative to the outer tube 14, the male thread portion 26 is threadedly engaged with the female thread portion 20 by the clamping screw portion 24, while the pressing portion 22 is passed through the pair of through slits 18 to press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The clamping screw portion 24 has a head portion 58 at the end of the shank portion 36 opposite the end on the male thread portion side that can be held and rotated with fingers. The diameter of the head portion 58 is preferably as large as possible so that it can be gripped with fingers with little force and rotated, and from the viewpoint of preventing slippage, it may be provided with a plurality of shallow grooves spaced apart in the circumferential direction. In this sense, the head portion 58 constitutes a torque-applying grip 132 that applies rotation around the extension direction of the male thread portion 26.

[0034] As shown in Figure 7, by threading the male thread portion 26 of the tightening screw portion 24 into the female thread portion 20 of the outer tube 14, the pressing end face 54 is pressed against the outer peripheral surface of the inner tube 12 through the slit in the outer tube 14, and the inner tube 12 is moved until the diametrically opposite part of the outer peripheral surface of the inner tube 12 contacts the inner peripheral surface of the outer tube 14. As a result, the inner tube 12 is firmly fixed and supported to the outer tube 14 by support at three points: two pressing end faces 54 (C2) and one line contact (C1) extending in the longitudinal direction of the tube. In this case, by threading the male thread portion 26 into the female thread portion 20, the lower surface 38 of the shank portion 36 and the upper surface 44 of the protrusion 42 of the pressing body 34 come into contact, and the fastening screw portion 24 and the pressing body 34 are integrally pressed and fixed against the inner tube 12 and screwed and fixed against the outer tube 14. Therefore, the height H of the U-shape of the pressing portion 22 needs to be greater than the thickness of the outer tube 14 plus the clearance d between the inner and outer tubes 14. When a heavy object is fixed and supported at a predetermined height by the inner and outer tubes 14 extending in the vertical direction, a greater fixing and support effect is achieved when the pair of pressing bodies 34 of the pressing section 22 are spaced apart in the extension direction of the inner and outer tubes 12, 14 than when they are spaced apart in the circumferential direction of the inner and outer tubes 12, 14. When the area of ​​the pressing end face 54 of the pressing body 34 is constant, the frictional force between the pressing end face 54 and the outer peripheral surface of the inner tube 12, which is based on the clamping force of the clamping screw section 24, is important for fixing and support, so a larger clamping force per unit area is preferable. In this sense, too, it is advisable to provide multiple pressing end faces 54.

[0035] With regard to the use of the length adjustment jig 10, the pair of through slits 18 are provided at a predetermined interval in the longitudinal direction of the inner and outer tubes 12, 14 and extend circumferentially of the inner and outer tubes 12, 14, respectively, the inner and outer tubes 12, 14 are oriented vertically, and a heavy object is supported at a predetermined height by either the inner or outer tube 12, 14. In particular, when the length adjustment jig 10 is used to adjust the fitting length of the vertically extending inner and outer tubes 12, 14 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 portion 22 and the outer peripheral surface 15 of the inner tube 12, the greater the resistance of the pressing surface of the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, i.e., the greater the tightening force of the fastening screw portion 24, and therefore strength sufficient to withstand such a large tightening force is required. Therefore, the pressing portion 22, the fastening screw portion 24, and the inner and outer tubes 12, 14 constituting the length adjustment jig 10 are preferably made of metal. The length adjusting jig 10 may be used in a stand that supports everyday items at a predetermined height, or in a vehicle that supports a saddle at a predetermined height.

[0036] Alternatively, the length adjustment jig 10 may be made of resin to ensure light weight. In particular, it is preferable to ensure a sufficient thickness in order to ensure the strength around the pair of slits and female threaded portion 20. In this case, the pair of through slits 18 are preferably spaced a predetermined distance apart from each other in the circumferential direction of the inner and outer tubes 12 and 14. The length adjustment jig 10 is used, for example, in a clothes drying pole for adjusting the overall length of the inner and outer tubes 12 and 14. In the case of a clothes drying pole, the overall length of the clothes drying pole, consisting of the inner and outer tubes 12 and 14, can be adjusted according to the number of laundry items to be dried by simply adjusting the engagement length of the inner and outer tubes 12 and 14 using the length adjustment jig 10. From the viewpoint of lightness, when the inner and outer tubes are made of resin, and particularly when the inner tube is made of resin, the pressing surface of the pressing body is pressed against the outer peripheral surface of the inner tube when tightened with the fastening screws. Therefore, if the area of ​​the pressing surface is too small, the pressing pressure against the outer peripheral surface of the inner tube will increase, and even if the thickness of the inner tube is sufficient to prevent deformation of the inner tube itself when supporting the longitudinal load of the inner and outer tubes, scratches may be made on the outer peripheral surface of the inner tube, and in some cases dents may occur. Therefore, it is advisable to adjust the area of ​​the pressing surface of the pressing body in consideration of the hardness of the resin of the inner tube, so that the pressing pressure is within a range that prevents damage to the outer peripheral surface of the inner tube even when the fastening screws are tightened by hand.

[0037] 23 , one of the pair of through slits 18 may be a vertical slit extending along the longitudinal direction of the inner and outer tubes 12, 14, and the other may be a horizontal slit extending along the circumferential direction of the inner and outer tubes 12, 14, and the pressing body may accordingly have one vertical pressing surface that can penetrate the vertical slit and the other horizontal pressing surface that can penetrate the horizontal slit. This allows the vertical pressing surface to be used not only to support the inner and outer tubes 12, 14 against the load applied in the longitudinal direction, but also to suppress relative rotation of one of the inner and outer tubes 12, 14 relative to the other around the longitudinal direction of the inner and outer tubes 12, 14 by the horizontal pressing surface. Alternatively, a pair of pressing bodies may be provided, and the other may be provided on the diametrically opposite side of the position where one pressing body is provided on one of the inner and outer tubes 12, 14, without increasing the pressing area of ​​each pressing body.

[0038] 33 and 34 , in a further modification, a plurality of holes 128 are provided in the outer surface of the inner pipe 12 at intervals along the longitudinal direction of the pipe at circumferential positions facing the female thread portion 22 of the outer pipe 14. Each of the plurality of holes 128 has a size that allows the male thread portion 26 of the fastening screw 24 to be inserted therein, and the male thread portion 26 has a length sufficient to penetrate the thickness of the inner pipe 12 when the fastening screw 24 is screwed into the female thread portion 20 of the outer pipe 14. As a result, when the inner and outer tubes 12, 14, which are fitted together, are fixed and supported, at the fitting position of the inner and outer tubes 12, 14, the pair of pressing bodies 34 of the U-shaped cross-section pressing portion 22 are each passed through the corresponding through slits 18 of the outer tube 14, and the male threaded portion 26 of the fastening screw 24 is then passed through the clear hole 32 of the pressing portion 22 and screwed into the female threaded portion 20 provided on the surface of the outer tube 14.As a result, the pair of pressing surfaces 54 of the pressing portion 22, which are spaced apart in the longitudinal direction of the inner and outer tubes 12, 14, each have a shape that follows the outer peripheral surface 19 of the inner tube 12, so that they abut against the outer peripheral surface 19 of the inner tube 12 to fix and support the inner and outer tubes 12, 14, and the male threaded portion 26 of the fastening screw 24 is inserted into one of the multiple holes 128. The spacing between adjacent holes 128 is set so that when each pressing portion 22 is passed through the corresponding through slit 18 of the outer tube 14, the male thread portion 26 of the fastening screw 24 is inserted into one of the plurality of holes 128. For example, when a user supports their weight by holding the crutches in their hands while adjusting the length of the crutches so that the top end of the crutches rests against their armpits, the crutches are required to have a load-bearing function in addition to a length-adjustment function. In particular, if the load-bearing function is suddenly lost, the user may lose their balance and fall, which directly affects their physical safety, so it is necessary to ensure a complete load-bearing function. In this embodiment, by selecting the hole 128 into which the male threaded portion 26 of the fastening screw 24 is inserted, the overall length of the inner and outer tubes 12, 14, i.e., the length of the wand, can be adjusted, and then the inner and outer tubes 12, 14 are fixed and supported by the pressing portion 22, and the male threaded portion 26 of the fastening screw 24 is inserted and held in the hole 128, so that even if an excessive load is applied and the fixing and support of the inner and outer tubes 12, 14 by the pressing portion is impaired, it is possible to ensure complete load support function.

[0039] 35 , a narrow groove 130 is provided in the outer surface of the inner pipe 12 at the intended fitting portion of the inner and outer pipes 12, 14 in the longitudinal direction of the pipe at a circumferential position facing the female thread portion 22 of the outer pipe 14. The width of the narrow groove 130 is large enough to allow the male thread portion 26 of the fastening screw 24 to be inserted therein, and the male thread portion 26 has a length sufficient to penetrate the thickness of the inner pipe 12 when the fastening screw 24 is screwed into the female thread portion 20 of the outer pipe 14. As a result, when the inner and outer tubes 12, 14, which are fitted together, are fixed and supported, at the fitting position of the inner and outer tubes 12, 14, the pair of pressing bodies 34 of the U-shaped cross-section pressing portion 22 are each passed through the corresponding through slits 18 of the outer tube 14, and the male threaded portion 26 of the fastening screw 24 is then passed through the clear hole 32 of the pressing portion 22 and screwed into the female threaded portion 20 provided on the surface of the outer tube 14.As a result, the pair of pressing surfaces 54 of the pressing portion 22, which are spaced apart in the longitudinal direction of the inner and outer tubes 12, 14, each have a shape that follows the outer peripheral surface 19 of the inner tube 12, so that they abut against the outer peripheral surface 19 of the inner tube 12 to fix and support the inner and outer tubes 12, 14, and the male threaded portion 26 of the fastening screw 24 is inserted into the elongated groove 130. In this embodiment, the fitting positions of the inner and outer tubes 12, 14 are adjusted to adjust the overall lengths of the inner and outer tubes 12, 14, and the inner and outer tubes 12, 14 are then fixed and supported by the pressing portion 22, and the male thread portion 26 of the fastening screw 24 is inserted and held in the elongated groove 130, so that even if a load that would cause relative rotation about the longitudinal direction of the tubes is applied between the inner and outer tubes 12, 14, it is possible to prevent such relative rotation from occurring. From this perspective, the depth of the elongated groove 130 may be provided by cutting the outer peripheral surface 16 of the outer tube 14.

[0040] According to the length adjusting jig having the above-mentioned configuration, the female screw portion 20, at least one through slit 18 within a predetermined range from the female screw portion 20, at least one pressing portion 22 that passes through the through slit 18 from the outer peripheral surface 16 of the outer tube 14 and contacts the outer peripheral surface 15 of the inner tube 12, and a fastening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, are respectively provided on the outer peripheral surface 16 of the outer tube 14. When adjusting the length of the mating portion of the inner and outer tubes 12, 14 that are fitted together, the tip surface of the pressing portion 22 is shaped to follow the outer peripheral surface 15 of the inner tube 12 so that it can come into surface contact with the outer peripheral surface 15 of the inner tube 12, thereby After adjusting the fitting position of the inner tube 12 relative to the outer tube 14, the clamping screw portion 24 is rotated to thread the male thread portion 26 into the female thread portion 20 provided on the outer surface 16 of the outer tube 14, without providing a pressing portion storage space that has an opening facing the inner surface 17 of the outer tube 14 and protrudes outside the outer tube 14.The clamping screw portion is then screwed in, causing the pressing portion 22 within a predetermined range from the female thread portion 20 to pass through the through slit 18, and the tip surface can be pressed and fixed in place in surface contact against the outer surface 15 of the inner tube 12.This simple structure allows the overall length of the inner tube 12 and outer tube 14 to be adjusted so that it can be fixed and held in place by simple operation without requiring excessive clamping force. It has been described that the inner and outer pipes 12, 14 have circular cross sections, and that the pressing surface 54 of the pressing body 34 has an arc-shaped cross section the same as the diameter of the inner pipe 12 so that it adheres closely to the outer surface of the inner pipe 12, and that if the diameters of the inner and outer pipes 12, 14 are different, a pressing body 34 having a pressing surface 54 corresponding to the diameter is prepared.However, this is not limited to this, and if the inner and outer pipes 12, 14 have an equal, flat rectangular cross section, the pressing surface 54 of the pressing body 34 may have a flat cross section so that it adheres closely to the outer surface of the inner pipe 12, and this can be used for inner and outer pipes 12, 14 having various rectangular cross sections.

[0041] A method for adjusting the lengths of the inner and outer pipes 12, 14, particularly for existing inner and outer pipes 12, 14 that fit together, will be described below. The method comprises the steps of drilling a pair of spaced-apart through slits 18 and a female screw portion 20 between the pair of through slits 18 in the outer peripheral surface 16 at one end of the outer pipe 14; and preparing a pressing portion 22 that is positioned on the outer peripheral surface 16 of the outer pipe 14, passes through the pair of through slits 18, and abuts against the outer peripheral surface 15 of the inner pipe 12, and has a male screw portion 26 that can be screwed onto the female screw portion 20, and can be used to press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner pipe 12. After adjusting the fitting position of the inner pipe 12 relative to the outer pipe 14, the male threaded portion 26 is threaded into the female threaded portion 20 using the tightening screw portion 24, and the pressing portion 22 is passed through the pair of through slits 18 to be pressed and fixed against the outer peripheral surface 15 of the inner pipe 12. According to the above method, in the existing inner and outer pipes 12, 14, by drilling a hole in one end of the outer pipe 14, it is possible to generally adjust the overall length of the inner pipe 12 and the outer pipe 14 for the existing fitting structure between the inner pipe 12 and the outer pipe 14.

[0042] A second embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are designated by similar reference numerals and description thereof will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 8 to 10. The second embodiment of the present invention is characterized by a tubular base portion 30 provided on the outer tube 14, and is a length adjustment jig 10 interposed between the inner tube 12 and outer tube 14 that are fitted together, and has a pressing portion 22 that passes through a pair of through slits 18 and abuts against the outer peripheral surface 15 of the inner tube 12, and a tightening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, and the tightening screw portion 24 has a male thread portion 26 that can be threaded into the female thread portion 20, which is common to the first embodiment. However, while in the first embodiment a pair of through slits 18 was provided on the outer peripheral surface 16 of the outer tube 14 and the female thread portion 20 was provided between the pair of through slits 18, in this embodiment a tubular base portion 30 is provided that is attached and fixed to one end of the outer tube 14, and a pair of through slits 18 spaced apart from each other are provided on the outer peripheral surface 16 of the tubular base portion 30, and the female thread portion 20 is provided between the pair of through slits 18.

[0043] More specifically, the tubular base portion 30 has a hollow cylindrical shape, one end of which can be fitted onto one end 28 of the outer tube 14, and the inner tube 12 is inserted into the other end with a predetermined clearance from the outer peripheral surface 16 of the tubular base portion 30. With the above configuration, after adjusting the fitting position of the inner tube 12 relative to the tubular base portion 30, the male threaded portion 26 is threaded into the female threaded portion 20 by the tightening screw portion 24, and the pressing portion 22 is passed through the pair of through slits 18 to press and fix the tubular base portion 30 against the outer peripheral surface 15 of the inner tube 12. Note that the tubular base portion 30 can be attached and fixed to the one end of the outer tube 14 by, for example, screw fixing or interference fit, as long as it is firmly fixed to the outer tube 14. For existing inner and outer tubes 12, 14, a pressing portion 22 and a tightening screw portion 24 that can press and fix the pressing portion 22 toward the outer peripheral surface 15 of the inner tube 12, as well as a tubular base portion 30 that has a pair of through slits 18 and a female screw portion 20 between the pair of through slits 18 on the outer peripheral surface 16, make it possible to adjust the fitting length of the inner and outer tubes 12, 14.

[0044] A third embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are designated by similar reference numerals and description thereof will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to FIG. 11 . The third embodiment of the present invention is characterized by a tubular protrusion 65 provided on the outer peripheral surface of the outer tube 14. The length adjustment jig 10 is interposed between the inner tube 12 and outer tube 14, which are fitted together, and has a pressing portion 22 that passes through a pair of through slits 18 and comes into contact with the outer peripheral surface 15 of the inner tube 12, and a tightening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The tightening screw portion 24 is similar to the first embodiment in that it has a male thread portion 26 that can be threaded into the female thread portion 20. However, while in the first embodiment the outer peripheral surface 16 of the outer tube 14 has a pair of through slits 18 and the female thread portion 20 between them, in this embodiment, a tubular protrusion 65 is provided at a position corresponding to the female thread portion 20, facing outward and perpendicular to the outer peripheral surface 16 of the outer tube 14. More specifically, the tubular protrusion 65 has a circular annular cross section with a predetermined height h. The tubular protrusion 65 has a female thread 20 formed therein so as to align with the female thread 20, and the male thread 26 of the fastening screw portion 24 can be threaded thereon. The tubular protrusion 65 may be fixed to the outer peripheral surface 16 separately from the outer pipe 14, for example, by welding. The outer shape of the tubular protrusion 65 does not need to be cylindrical; any shape may be used as long as the female thread 20 is formed therein so as to align with the female thread 20. This embodiment is effective when the outer pipe 14 is thin and the threading length of the male thread 26 cannot be sufficiently secured, and the predetermined height h may be determined from this perspective. Similar to the first embodiment, the length of the male thread 26 is set so that the tip of the male thread 26 does not come into contact with the outer peripheral surface 15 of the inner pipe 12 when the pressing portion 22 is pressed against and fixed to the outer peripheral surface 15 of the inner pipe 12. As a variant, conversely, when the thickness of the outer tube 14 is large, the outer surface 16 of the outer tube 14 may be ground inward around the female thread portion 20 between the pair of through slits 18 on the outer surface 16 of the outer tube 14 to form a shallow groove portion (not shown) having a bottom surface, and a through hole having the female thread portion 20 on the bottom surface may be provided.The depth of the shallow groove portion, i.e., the depth to which the outer peripheral surface 16 is ground, can be set appropriately depending on the thickness of the outer tube 14 and / or the length of the male thread portion 26, thereby ensuring versatility regardless of the conditions of the inner and outer tubes 12, 14 and the tightening thread portion 24.

[0045] A fourth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are designated by similar reference numerals and description thereof will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to FIGS. 12 and 13. The fourth embodiment of the present invention is characterized by the tightening screw portion 24. The length adjustment jig 10 is interposed between the inner tube 12 and outer tube 14, which are fitted together, and has a pressing portion 22 that passes through a pair of through slits 18 and abuts against the outer peripheral surface 15 of the inner tube 12, and a tightening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, which is similar to the first embodiment. However, while in the first embodiment the tightening screw portion 24 has a male thread portion 26, and the outer peripheral surface 16 of the outer tube 14 has a pair of through slits 18 and a female thread portion 20 between the pair of through slits 18, in this embodiment, on the other hand, the tightening screw portion 24 has a nut portion 70 with a female thread portion 72, and the outer peripheral surface 16 of the outer tube 14 has a male thread portion 74. More specifically, the nut portion 70 has a female thread portion 72 that penetrates its center and can be threaded onto the male thread portion 74, and a shallow groove is provided on the outer peripheral surface to prevent slippage when tightening by hand. Meanwhile, a male thread portion 74 is provided on the outer peripheral surface 16 of the outer tube 14 at the position of the female thread portion 20, facing outward perpendicular to the outer peripheral surface 16 of the outer tube 14, and the female thread portion 20 is omitted. The male thread portion 74 may be fixed to the outer peripheral surface 16, for example, by welding. According to this embodiment, when the nut portion 70 is loosened, the presser body 34 itself remains inserted into the male thread portion 74 via the clearance hole 32. This prevents the presser body 34 from accidentally coming loose and falling apart when the tightening screw portion 24 is loosened, as in the first embodiment.

[0046] 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 FIG. 14 . The fifth embodiment of the present invention is characterized by a coil spring 76 provided between the outer peripheral surface 16 of the outer tube 14 and the pressing portion 22. The length adjustment jig 10 is interposed between the inner tube 12 and the outer tube 14 that are fitted together, and includes the pressing portion 22 that passes through a pair of through slits 18 and abuts against the outer peripheral surface 15 of the inner tube 12, and a fastening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The fastening screw portion 24 has a male thread portion 26 that can be threaded into the female thread portion 20. This is common to the first embodiment, but the first embodiment does not include such a coil spring 76. More specifically, a coil spring 76 having a diameter larger than that of the female threaded portion 20 is provided, and is insertable into the male threaded portion 26 of the clamping screw portion 24 through the clearance hole 32 of the pressing portion 22, and the number of coil turns may be set appropriately depending on the height of the U-shape of the pressing portion 22. According to this embodiment, when the male threaded portion 26 of the clamping screw portion 24 is threaded into the female threaded portion 20, the pressing portion 22 is supported by the upper surface of the coil spring 76, so that the pressing end surface 54 protrudes from the corresponding through slit 18 toward the outer peripheral surface 15 of the inner tube 12, and this prevents the inner tube 12 from interfering with the movement of the inner tube 12 relative to the outer tube 14 in the extension direction of the tubes when adjusting the fitting position between the inner tube 12 and the outer tube 14. Furthermore, by increasing the biasing force of the coil spring 76, when the coil spring 76, which is provided between the outer peripheral surface 16 of the outer tube 14 and the pressing portion 22, is compressed, the pressing portion 22 is pressed upward toward the tightening screw portion 24, strengthening the threaded engagement between the male thread portion 26 and the female thread portion 20. For example, it is possible to prevent the tightening of the tightening screw portion 24 from loosening over time, causing the fixed support between the inner tube 12 and outer tube 14, which are fitted together, to become unstable.

[0047] 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 15 to 17. The sixth embodiment of the present invention is characterized by a protective plate 78 provided between the inner tube 12 and the outer tube 14. The length adjustment jig 10 is interposed between the mating inner tube 12 and outer tube 14 and has a pressing portion 22 that passes through a pair of through slits 18 and abuts against the outer peripheral surface 15 of the inner tube 12, and a fastening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The fastening screw portion 24 has a male thread portion 26 that can be threaded into the female thread portion 20. This is common to the first embodiment, but the first embodiment does not include such a protective plate 78. More specifically, the protective plate 78 has a width W that is longer than the length of the pair of through slits 18, and a length L that is longer than the distance between the pair of through slits 18 in the extension direction of the inner and outer tubes 14, and is made of a material that is softer than the outer peripheral surface 15 of the inner tube 12. As shown in Figure 16, a shallow groove 80 of a size that allows the protective plate 78 to fit into is provided on the inner peripheral surface of the outer tube 14, where the pair of through slits 18 are provided. When the protective plate 78 is fitted into the shallow groove 80, it protrudes slightly inward from the inner peripheral surface of the outer tube 14. Therefore, when the fastening screw portion 24 is tightened and the pressing portion 22 is pressed and fixed against the outer peripheral surface 15 of the inner tube 12, the protective plate 78 is also crushed, and the pressing end face 54 comes into direct contact with the outer peripheral surface 15 of the inner tube 12, making it possible to prevent the outer peripheral surface 15 of the inner tube 12 from being scratched or dented. Note that by making the protective plate 78 out of rubber with a high coefficient of friction, it is possible to ensure the frictional force between the protective plate 78 and the outer peripheral surface 15 of the inner pipe 12, thereby further strengthening the fixed support between the inner pipe 12 and the outer pipe 14. Note that Fig. 17 shows a modified example in which a pair of protective plates 82 are provided, each of which is fitted into the corresponding through slit 18. When the pressing portion 22 is pressed and fixed against the outer peripheral surface 15 of the inner pipe 12, each protective plate 82 is also crushed, preventing the outer peripheral surface 15 of the inner pipe 12 from being scratched or dented, and ensuring the frictional force between the protective plate 82 and the outer peripheral surface 15 of the inner pipe 12. However, the shallow groove 80 provided in the inner peripheral surface of the outer pipe 14 can be omitted.

[0048] A seventh 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 Fig. 18. The seventh embodiment of the present invention is characterized by the orientation of the pair of through slits 18 and the female thread portion 20 between the pair of through slits 18. The length adjustment jig 10 is interposed between the inner tube 12 and the outer tube 14 that are fitted together, and has a pressing portion 22 that passes through the pair of through slits 18 and abuts against the outer peripheral surface 15 of the inner tube 12, and a tightening screw portion 24 that can press and fix the pressing portion 22 toward the outer peripheral surface 15 of the inner tube 12, and the tightening screw portion 24 has a male screw portion 26 that can be screwed into the female thread portion 20, which is common to the first embodiment. However, in the first embodiment, the orientation of the pair of through slits 18 and the female thread portion 20 between the pair of through slits 18 provided on the outer peripheral surface 16 of the outer tube 14 was along the extension direction of the inner tube 12 and the outer tube 14, whereas in the present embodiment, the orientation of the pair of through slits 18 and the female thread portion 20 between the pair of through slits 18 is oblique to the extension direction of the inner tube 12 and the outer tube 14, and accordingly, the orientation of the pressing body 34 provided via the pair of through slits 18 is oblique. According to this embodiment, in addition to fixing and supporting the inner tube 12 and the outer tube 14 in the extension direction of the inner tube 12 and the outer tube 14, it is also effective in fixing and holding the inner tube 12 and the outer tube 14 against rotation around the extension direction of the inner tube 12 and the outer tube 14. The oblique angle of the pair of through slits 18 and the female thread portion 20 between the pair of through slits 18 with respect to the extension direction of the inner tube 12 and the outer tube 14 is preferably determined from this perspective.

[0049] An eighth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are designated by similar reference numerals and description thereof will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to FIG. 21 . The eighth embodiment of the present invention is characterized by a pressing body 34 provided on the outer tube 14. This length adjustment jig 10 is interposed between the inner tube 12 and outer tube 14 which are fitted together, and has a pressing portion 22 which passes through a through slit 18 and comes into contact with the outer peripheral surface 15 of the inner tube 12, and a tightening screw portion 24 which can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. This is common to the first embodiment in that the tightening screw portion 24 has a male thread portion 26 which can be threaded into the female thread portion 20. However, in the first embodiment, a pair of through slits 18 were provided in the outer peripheral surface 16 of the outer tube 14, and accordingly the pressing body 34 had a clear hole portion 32 in the center and a pair of pressing surfaces 54, but in this embodiment, a single through slit 18 is provided, and accordingly a single pressing body 34 is provided.

[0050] More specifically, a solid pressing body 34 is provided that can fit into the single through slit 18, and the position of the single through slit 18 on the outer peripheral surface 16 of the outer tube 14 is within the range of the diameter from the female thread portion 20 to the head portion 58 of the clamping screw portion 24. As a result, when the head portion 58 of the clamping screw portion 24 is rotated by hand and the male thread portion 26 is screwed into the female thread portion 20 toward the outer peripheral surface 15 of the inner tube 12, the lower surface of the head portion 58 comes into contact with the upper surface 40 of the pressing body 34, as in the first embodiment, and the pressing surface 54 of the pressing body 34 is shaped to fit along the outer peripheral surface 15 of the inner tube 12 so as to be in surface contact with the outer peripheral surface 15 of the inner tube 12, as in the first embodiment. Compared to the first embodiment, this embodiment is more suitable for use in adjusting the overall length of the inner and outer pipes 12, 14, such as a clothesline pole, than for applying the length adjustment jig 10 to the inner and outer pipes 12, 14 in the vertical direction to support a heavy object at a predetermined height.

[0051] A ninth 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 FIG. 22 . The ninth embodiment of the present invention is characterized by its use as a length adjustment jig 10, specifically, its use as a so-called earthquake-proof support. More specifically, the length adjustment jig 10 includes a ceiling-side fixing portion 90 provided on the upper end surface 98 of the inner tube 12 of the length adjustment jig 10 and a shelf-side fixing portion 84 provided on the lower end surface 96 of the outer tube 14 of the length adjustment jig 10 to prevent furniture, such as a shelf, from tipping over during an earthquake. The length adjustment jig 10 is interposed between the ceiling-side fixing portion 90 and the shelf-side fixing portion 84. The ceiling-side fixing portion 90 has an abutting surface 92 that can abut against the ceiling surface and a receiving portion 94 that can receive the upper end surface 98. The shelf-side fixing part 84 has abutment surfaces 89 that are perpendicular to each other and abutment surfaces 86 that can abut the top surface of the shelf so that it can be attached to the clearance between the wall and the shelf at the corner of walls that intersect perpendicularly, and a receiving part 88 that can receive a lower end surface 96. With this configuration, the fitting positions of the inner pipe 12 and the outer pipe 14 can be adjusted so that the abutment surface 92 of the ceiling-side fixing part 90 abuts the ceiling surface and the abutment surface 86 of the shelf-side fixing part 84 abuts the top surface of the shelf, and the overall lengths of the inner pipe 12 and the outer pipe 14 can then be adjusted, and the inner peripheral surface of the outer pipe 14 can be firmly fixed and supported to the outer peripheral surface of the inner pipe 12 via the pressing part 22 using the tightening screw part 24. For example, by providing a plurality of such length adjustment jigs 10 between the ceiling and the shelf, it is possible to firmly fix the shelf to the ceiling.

[0052] A tenth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment will be assigned the same reference numerals and description thereof will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 24 to 26. A characteristic of the tenth embodiment of the present invention is that it is applied as a tilt angle adjustment jig to support a solar panel and adjust the tilt angle, taking a solar panel as an example.

[0053] More specifically, the inclination angle adjustment jig has a tubular portion 102 having an outer surface 16 with a female thread portion 20 and at least one through hole 18 within a predetermined range from the female thread portion 20, a first support bar 104 extending at a predetermined angle relative to the extension direction of the tubular portion 102 and having a lower end 103 grounded, and a pivot 108 connecting an upper end 106 of the first support bar 104 to the tubular portion 102, and the upper end 106 of the first support bar 104 is connected to the tubular portion 102 so as to be rotatable around the pivot 108. Furthermore, it has a second support bar 112 that is slidably fitted into the tubular portion 102, extends along the extension direction of the tubular portion 102, and has a lower end 103 that is grounded, at least one pressing portion 22 that passes through the through hole 18 from the outer peripheral surface 16 of the tubular base portion and abuts against the outer peripheral surface 16 of the second support bar 112, and a tightening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface 16 of the second support bar 112, and the tip surface of the pressing portion 22 is shaped to follow the outer peripheral surface 16 of the second support bar 112 so that it can come into surface contact with the outer peripheral surface 16 of the second support bar 112, the tightening screw portion 24 has a male thread portion that can be screwed into the female thread portion 20, and the pressing portion 22 has a clearance hole 32 that can pass through the male thread portion 26. By moving the first support bar 104 within the plane P formed by both support bars so as to change the distance between the lower ends 103 of both support bars, the upper end 106 of the first support bar 104 rotates around the pivot 108 relative to the tubular portion 102 while adjusting the fitting position of the tubular base portion relative to the second support bar 112.Then, the tightening screw portion 24 screws the male threaded portion 26 into the female threaded portion 20 via the clearance hole 32, and the pressing portion 22 passes through the through hole 18, and the tip surface is pressed and fixed in a surface contact manner against the outer peripheral surface 16 of the second support bar 112, making it possible to adjust the inclination angle of the second support bar 112 relative to the contact surface.Each tubular portion 102 further has a pair of opposing overhanging flanges 116 that extend from its outer surface in a direction intersecting the extension direction of the tubular portion 102, and each of the pair of overhanging flanges 116 has a first through hole 120 that can receive a corresponding end 118 of the pivot shaft 108, and the upper end 106 of the first support bar 104 is provided with a second through hole 122 that can pass through the pivot shaft 108 in a direction intersecting the extension direction of the first support bar 104, and the upper end 106 of the first support bar 104 is positioned between the pair of overhanging flanges 116 so that the first through hole 120 and the second through hole 122 are aligned, and the pivot shaft 108 is provided through each of the first through holes 120 and the second through hole 122. A pair of such inclination angle adjusting jigs are provided so that the planes P formed by both support bars are parallel, and the opposing edges of the rectangular plate-shaped heavy load W are supported by the respective second support bars 112 of the inclination angle adjusting tool, while being supported at four points by the lower ends 103 of the respective first support bars 104 and second support bars 112 of the inclination angle adjusting tool. By adjusting the fitting position of each tubular base part of the inclination angle adjusting tool with the corresponding second support bar 112 and adjusting the inclination angle of each corresponding second support bar 112 of the inclination angle adjusting tool, the inclination angle θ of the rectangular surface of the rectangular plate-shaped heavy load W is adjusted, thereby configuring a device for supporting and adjusting the inclination angle of the rectangular plate-shaped heavy load W. The pair of inclination angle adjusting jigs are connected by an X-shaped cross member 124.

[0054] The tilt angle adjustment jig having the above configuration comprises a second support bar 112 fitted into the tubular portion 102 so as to be movable in the longitudinal direction of the tube, and a first support bar 104 connected to the tubular portion 102 via a pivot 108 and rotatable about the pivot 108, wherein the outer peripheral surface of the tubular portion 102 is provided with a female screw portion and at least one through-hole within a predetermined range from the female screw portion 72, and at least one pressing portion 22 that passes through the through-hole from the outer peripheral surface of the tubular base portion 102 and abuts against the outer peripheral surface of the second support bar 112, and a tightening screw portion 24 that can press and fix the pressing portion 22 against the outer peripheral surface of the second support bar 112, and the tip surface of the pressing portion 22 is shaped to follow the outer peripheral surface of the second support bar 112 so as to be in surface contact with the outer peripheral surface of the second support bar 112. The clamping screw portion 24 has a male screw portion 26 that can be screwed into the female screw portion 72, and the pressing portion 22 has a clearance hole 32 through which the male screw portion 26 can pass. Therefore, by moving the first support bar 104 so that the distance between the lower ends of both support bars changes within the plane formed by both support bars, the upper end of the first support bar 104 rotates around the pivot 108 relative to the tubular portion 102, and the fitting position of the tubular base portion 102 relative to the second support bar 112 is adjusted, and then the clamping screw By using screw portion 24 to thread male thread portion 26 into female thread portion 72 via clear hole portion 32, while pressing portion 22 is made to pass through the through hole and the tip surface is pressed and fixed in a surface contact manner against the outer circumferential surface of second support bar 112, the inclination angle θ of second support bar 112 with respect to the contact surface can be adjusted with a simple structure and easy operation without requiring excessive tightening force; for example, when a rectangular heavy object is supported by second support bar 112, the inclination angle θ of the rectangular surface can be adjusted.When a support stand is provided on each side of the solar panel, rather than providing a pivot 108 for each support stand, a single pivot 108 that passes through the horizontal direction of the solar panel is used as a shared pivot 108. This allows the tilt angle θ of the solar panel to be adjusted from large to small depending on the season from winter to summer, or the movement of the sun from sunrise to sunset throughout the day, by manually loosening and then retightening the torque-applying grip provided on only one side, and the weight of the solar panel acts to automatically rotate the single pivot 108 during this time, making it possible to continuously adjust the tilt angle θ of the solar panel depending on the time span for fastening and loosening.

[0055] An eleventh embodiment of the present invention will be described below. In the following description, like components to those in the first embodiment will be assigned like reference numerals and will not be described again. Below, the features of this embodiment will be described in detail with reference to Figures 27 and 28. The eleventh embodiment of the present invention is characterized in that, while the above-described embodiments were used only to adjust the length of the inner and outer tubes 14 by adjusting the fitting positions of the inner and outer tubes 14, or used only as a stand while supporting a heavy object with either the inner or outer tube 14 and adjusting the fitting positions of the inner and outer tubes 14, or supported a rectangular heavy object with either the inner or outer tube 14 and adjusting only the inclination angle θ of the rectangular surface of the rectangular heavy object, this embodiment is adapted to be used for traffic signs, and all of the inclination angle θ, lateral position, and height of the traffic sign can be adjusted.

[0056] More specifically, the present invention includes inner and outer tubes 12, 14 that stand upright vertically from the ground, a tubular section 102 that intersects the upper end of the outer tube 14, a diagonal tube 126 that fits inside the tubular section 102, and a traffic sign T that is attached to the upper end of the diagonal tube 126. The heights of the inner and outer tubes 12, 14 are adjustable, and the lateral position of the diagonal tube 126 can be adjusted by adjusting the position of the diagonal tube 126 relative to the tubular section 102. The present invention is applicable to a fixture support jig for a stand that supports and fixes a heavy object with either the inner or outer tube 12, 14, a jig for adjusting the overall length of the inner and outer tubes 12, 14, and a jig for adjusting the fitting position of the inner and outer tubes 12, 14 by rotatably connecting the inner and outer tubes 12 and 14 via a pivot 108. The configuration of each adjustment jig is the same as that of the above-described embodiment, and therefore detailed description thereof will be omitted. With the above configuration, it is possible to stably support traffic signs T that are permanently placed outdoors and may extend over several tens of kilometers, while easily adjusting the orientation and / or position.

[0057] A twelfth embodiment of the present invention will be described below. In the following description, like components to those of the first embodiment will be assigned like reference numerals and will not be described again. Below, the features of this embodiment will be described in detail with reference to Figures 19, 36, and 37. The twelfth embodiment of the present invention is characterized in that, while the above-described embodiments were used only to adjust the length of the inner and outer tubes 14 by adjusting the fitting positions of the inner and outer tubes 14, or used only as a stand while supporting a heavy object with either the inner or outer tube 14 and adjusting the fitting positions of the inner and outer tubes 14, this embodiment is adapted to be used for traffic signs, and all of the inclination angle θ, lateral position, and height of the rectangular sign can be adjusted. As shown in Figures 19, 36 and 37, a pair of inner and outer tubes 12, 14 are provided, which are fitted together using a length adjustment jig and extend parallel to each other at a specified distance and diagonally upwards, the lower parts of the outer tubes 14 of the pair of inner and outer tubes 12, 14 being connected by members Y3 and Y5, and a steelpan (musical instrument) to be supported at a specified height is placed between the upper parts of the inner tubes 12 of the pair of inner and outer tubes 12, 14, and members Y1 and Y2 are connected to the lower parts of each of the outer tubes 14 of the pair of inner and outer tubes 12, 14 so as to provide support for each of the pair of inner and outer tubes 12, 14 which are suspended diagonally from the upper ends of the inner tubes 12 and extend diagonally upwards, thereby supporting the steelpan (musical instrument) at four points. In this case, the length adjustment jig is used to adjust the fitting lengths of the inner and outer tubes 12, 14 so that they are the same for each of the pair of inner and outer tubes 12, 14, thereby enabling the steelpan (musical instrument) to be supported and fixed horizontally at the desired height. Furthermore, the fixing support jig of the present invention is also applied to the connection between the X-shaped crossing fixtures Y3, Y4 and the outer tube 14, and the fixing support jig of the present invention is used for the fitting parts of the inner and outer tubes 12, 14 to support the steelpan at a predetermined height, and when it is time to fold the stand after use, the X-shaped crossing fixtures Y3, Y4 can be straightened by loosening the fastening screws 24 of the fixing support jig and moving the fixing support jig upwards along the outer tube 14.This allows the stand to be folded up when transporting a large, heavy object such as a steel pan, making it compact and convenient for transport in a car, for example, and portable with one hand. At the same time, it can be unfolded into a stand with a single touch at the site of use. The structure of the fixing support jig is the same as that of the eleventh embodiment, so a detailed description thereof will be omitted. As a modification, as shown in Figure 20, when used as a microphone stand, the entire outer tube fits onto the outer peripheral surface of a diagonal bar that fixes the microphone to one end and adjusts its height. By using a length adjustment jig 10 for this fitting position, it is possible to easily adjust not only the height but also the horizontal position of the microphone.

[0058] As described above, the first to ninth embodiments have been described as length adjustment jigs, the tenth to twelfth embodiments as fixed support adjustment jigs serving as stands for supporting heavy objects, and the twelfth embodiment as an inclination angle adjustment jig, but all of these are common to the integral structure of the inner and outer tubes 12, 14 that constitutes these jigs at the fitting position of the inner and outer tubes 12, 14, and the manufacturing method of the integral structure of the inner and outer tubes 12, 14 includes the steps of machining, 3D printer modeling, or lost wax processing a pair of through slits 18 and a female screw portion 72 on the outer surface corresponding to the fitting portion of the outer tube 14 of a solid or hollow inner tube 12 and a hollow outer tube 14 that fit together; This is the stage of preparing a pressing portion 22 having a U-shaped side cross section, which penetrates a pair of through slits 18 from the outside of the outer surface and can be pressed against the outer peripheral surface 15 of the inner tube 12 in a tight contact manner by surface contact at two points, the pressing portion 22 having a clearance hole 32, and a tightening screw portion 24 having a female screw portion 72 and a torque applying grip 132 that can be threaded into the female screw portion 72, in which the diameter of the torque applying grip 132 is selected according to the support load so that it can be firmly supported by hand force alone, and at a predetermined fitting position, the tightening screw portion 24 is tightened by hand force via the torque applying grip 132, thereby threading the male screw portion 26 into the female screw portion 72 through the clearance hole 32. and a step of fixing the inner tube 12 and the outer tube 14 together in the longitudinal direction of the tubes, while forming an overall length adjustment jig for the inner and outer tubes 12, 14, or an inclination angle adjustment jig by adjusting the fitting position of the inner tube 12 and the outer tube 14 by rotatably connecting the inner tube 12 and the outer tube 14 via the pivot 108, or a fixing support jig for a stand that supports and fixes a heavy object with either the inner or outer tube 12, 14, by pressing and fixing the pressing portion 22 toward the outer peripheral surface 15 of the inner tube 12 in a surface contact manner against the outer peripheral surface 15 of the inner tube 12, and also by pressing and fixing the outer peripheral surface 15 of the inner tube 12 opposite the surface contact portion of the pressing portion 22 with the inner tube 12 against the inner peripheral surface of the outer tube 14. When the pressing portion 22 is thin relative to the width of the load receiving surface, it may be called a pressing plate, and when the pressing portion 22 is thick relative to the width of the load receiving surface, it may be called a pressing block.

[0059] More specifically, the inner tube 12 and the outer tube 14 may be made of either metal or resin, and may be manufactured based on either a solid material or a molten material. Depending on the material, the manufacturing method can be broadly categorized as follows: When the material is metal, for solid materials, machining such as pressing, cutting, and drilling is used; when the material is molten material, casting and 3D printing are used; when the material is resin, for solid materials, machining is used; and when the material is molten material, molding such as injection molding and blow molding is used; and when the material is resin, metal powder is used. In particular, when metal is cast, the lost wax method or full mold method is preferred, and when metal is 3D printed, metal powder is used. It should be noted that the inner tube 12 and the outer tube 14 are preferably made of resin from the viewpoint of lightness, but the male threaded portion 26 of the fastening screw and the female threaded portion 72 into which the male threaded portion 26 screws are both preferably made of metal from the viewpoint of durability. If the opening of the resin outer tube 14 is the male threaded portion 26, a metal nut having the male threaded portion 26 may be fitted into the opening of the resin outer tube 14, or if the thickness of the resin outer tube 14 is thin, it may be possible to locally increase the thickness in order to ensure the thickness of the female threaded portion 72.

[0060] 3D-printed objects are created using a 3D printer using a known method known as fused deposition modeling. Specifically, the manufacturing method includes a step of melting a resin composition or filament and a step of extruding the resulting melt from a nozzle of a 3D-printed object manufacturing device to form a 3D-printed object. The melting step involves melting a 3D-printing material, which is a propylene resin composition for 3D printers or a 3D-printed filament. The heating means for melting the 3D-printing material is not particularly limited, and known heating means can be used. For the melting step, it is preferable to use a 3D-printed object manufacturing device equipped with a heating means such as an electric heater. The temperature for melting the 3D-printing material is not particularly limited and can be set appropriately depending on the properties of the thermoplastic resin. The temperature for melting the 3D-printing material may be, for example, +10 to +150°C above the melting point or glass transition temperature (Tg) of the thermoplastic resin, whichever is higher. In the melting step, for example, the 3D printing material may be melted and kneaded. By melting and kneading the 3D printing material, the 3D printing material tends to be mixed more uniformly. Therefore, unevenness in the material of the resulting 3D-printed object is likely to be suppressed. As a result, deformation of the 3D-printed object tends to be further suppressed.

[0061] In the modeling process, the 3D printing material melted in the melting process is extruded from a nozzle to form a 3D-printed object. In the modeling process, for example, the molten 3D printing material is extruded from the nozzle of a 3D printing object manufacturing device, and a 3D-printed object can be manufactured by sequentially stacking 2D layers on a substrate based on multiple 2D data sets. The multiple 2D data sets are generated by slicing the 3D coordinate data of the 3D-printed object to be manufactured using slicer software. The 3D printing object manufacturing device may be a material extrusion-type 3D printing object manufacturing device. There are no particular limitations on the material extrusion-type 3D object manufacturing device, and any known device or known device configuration may be used. The 3D printing object manufacturing device may, for example, be a device including a cylinder, a nozzle, and a heating means. The 3D printing material is supplied to the cylinder. The nozzle is located downstream of the cylinder in the direction in which the 3D printing material is discharged. The nozzle ejects the 3D printing material. The heating means is provided on the cylinder. The heating means heats and melts the 3D printing material. The 3D printing object manufacturing device extrudes the heated and melted 3D printing material from the nozzle and performs additive manufacturing on the 3D printing material extruded from the nozzle. This produces a 3D printed object. Note that the 3D printing material may also be solidified by irradiating it with ultraviolet light using a conventionally known stereolithography method.

[0062] The cylinder may have a screw therein. The screw kneads the 3D printing material. The 3D printing object manufacturing apparatus may further include a table device. The table device is disposed opposite the nozzle. The molten 3D printing material extruded from the nozzle is deposited on the table device. The 3D printing object manufacturing apparatus may further include a control means. The control means controls the spatial coordinates of the substrate and the nozzle, as well as the amount of 3D printing material extruded from the nozzle. The control means preferably controls the discharge of the molten 3D printing material extruded from the nozzle, and controls the movement of the nozzle and / or the table device in the X-axis, Y-axis, and Z-axis directions relative to a reference plane. Note that a stereolithography method may be used in which the molten 3D printing material is solidified by ultraviolet light.

[0063] On the other hand, the lost wax process can be broadly classified into two types of casting methods: one in which the pattern used to create the mold is removed from the mold by dissolving or burning it off, and the remaining space is filled with molten metal to cast the product (burnt pattern methods such as the lost wax process and full mold process), and the other in which the pattern itself is not burned off, but is demolded (physically removed) from the mold to create the mold shape, or the mold itself is created by machining, etc., and then the product is cast (non-burnt pattern methods such as the Shaw process and die casting).

[0064] The lost-wax process uses wax as the pattern material, and after laminating and hardening a slurry mold material onto a pattern formed using a mold or other tool, the wax is removed (heated and dissolved, burned off), and the space where the original pattern was located is filled with molten metal to create a casting.The full-mold process uses a resin material such as polystyrene foam as the pattern material, and a pattern created by mold forming or direct machining is buried in the mold material, and molten metal is poured in as it is, causing the pattern to disappear as the molten metal is filled in, creating a casting.

[0065] The pressing surface has an outer shape of an elongated rectangle, and the area of ​​the elongated rectangle should be determined from the viewpoint of increasing or decreasing the pressing pressure due to the fastening force of the screw. For example, when the inner and outer pipes 12, 14, and particularly the inner pipe 12, are made of resin, it is preferable to ensure the area of ​​the elongated rectangle from the viewpoint of protecting the outer peripheral surface 15 of the inner pipe 12. The surface shape is preferably a shape that follows the outer peripheral surface 15 of the inner pipe 12 so as to be able to abut closely against the outer peripheral surface 15 of the inner pipe 12. For example, when the inner pipe 12 has a circular cross section, it should be an arc-shaped curved surface. When the inner pipe 12 has a rectangular cross section, it should be a flat surface when abutting against one surface of the rectangular cross section. When abutting against a corner of the rectangular cross section, it should be bent inward in a broken line so as to straddle two adjacent intersecting surfaces, and each surface should be a flat surface.

[0066] According to the manufacturing method of the integrated structure of inner and outer pipes having the above-mentioned configuration, when preparing the inner and outer pipes to be fitted together, the pressing portion 22 having the clearance hole 32, and the fastening screw portion having the female screw portion and the torque application grip 132 that can be screwed into the female screw portion, the diameter of the torque application grip 132 is selected according to the support load that is determined depending on the application of the integrated structure of the inner and outer pipes as a length adjustment jig, an inclination angle adjustment jig, or a fixed support jig for a stand, and at a predetermined fitting position of the inner and outer pipes, the fastening screw portion is tightened by hand via the torque application grip 132 to thread the male screw portion into the female screw portion via the clearance hole 32, thereby rotating the pressing portion 22 toward the outer peripheral surface 15 of the inner pipe 12. By pressing and fixing the outer surface 15 of the tube 12 in a surface contact manner, and by pressing and fixing the outer surface 15 of the inner tube 12 on the opposite side of the surface contact portion of the pressing portion 22 with the inner tube 12 against the inner surface of the outer tube, an overall length adjustment jig for the inner and outer tubes can be constructed, or an inclination angle adjustment jig that rotatably connects the inner tube 12 and outer tube via a pivot and adjusts the fitting position of the inner tube 12 and outer tube, or a fixed support jig for a stand that supports and fixes heavy objects with either the inner or outer tube, and by completing the process by fixing the inner tube 12 and outer tube together in the longitudinal direction of the tubes, it is possible to provide a manufacturing method for an integrated structure of inner and outer tubes that can firmly support the inner and outer tubes together using only manual force, depending on various applications.

[0067] A thirteenth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment will be assigned the same reference numerals and description thereof will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 38 to 40. The thirteenth embodiment of the present invention is characterized in that, while in the above-mentioned embodiments, there is a case where the fastening screws 24 are loosened too much and the pressing portions 22 are completely removed from the corresponding through slits 18, this embodiment is designed to prevent such a situation from occurring.

[0068] More specifically, when loosening the fixed support provided by the fastening screws 24 at the mating portions of the inner and outer tubes 12, 14, it is necessary to reverse the fastening screws 24 to release the contact of the pressing surface 54 of the pressing body 34 with the outer surface of the inner tube 12. However, if the fastening screws 24 are loosened too much, the pressing portions 22 may come completely out of the corresponding through slits 18, causing the pressing portions to fall off the inner and outer tubes 12, 14, and in some cases, the pressing portions 22, which are small parts, may even go missing. In this case, by providing a difference between the inclination angle of the pressing body 34 that forms the leg of the pressing portion 22 with a U-shaped side cross section and the inclination angle of the through slit 18 into which the pressing body 34 is inserted, the pressing body 34 is pressed into the through slit 18 while being deformed, and even if the fastening screw 24 is loosened too much and the pressing portion 22 completely comes out of the corresponding through slit 18, the pressing portion 22 is engaged and held in the pair of through slits 18, thereby effectively preventing it from falling off.

[0069] The following description will be given assuming that the tubular base portion 30 is fitted and fixed to the end of the outer tube 14, for example, by screwing. In Figures 38 to 40, the cross section of the pressing body 34 from the top surface 44 to the pressing surface 54 is V-shaped, while the cross sections of the pair of through slits 18 in the thickness direction of the inner and outer tubes 12, 14 are also V-shaped. Each through slit 18 has an opposing inclined inner side surface 150 and an inclined outer side surface 152 as a through hole through which the pressing body 34 can be inserted in the thickness direction of the outer tube 14. The first angle θ2 of the inclined outer side surface 35 of each of the pair of pressing bodies 34 relative to the top surface 44 is greater than the second angle θ1 of the inclined surface of the corresponding through slit 18 relative to the outer peripheral surface 15 of the inner tube 12. The inclined inner side surface 150 and the inclined outer side surface 152 constituting the through slit 18 are set parallel to each other. For example, the difference between the first angle θ2 and the second angle θ1 is one-twentieth to one-tenth of one degree.

[0070] 38 , with the inner tube 12 fitted inside the outer tube 14, each pressing surface 54 of the pressing body 34 is positioned at the opening 154 of the corresponding through slit 18. In this case, the width T2 of the opening 154 is set to be larger than the thickness T1 of the inclined portion 56, and the distance L2 between the upper edges of the inclined outer side surfaces 152 at the opening 154 is set to be smaller by a predetermined value than the distance L1 between the outer edges of the pressing surfaces 54 of the inclined portion 56.

[0071] Next, as shown in Figure 39, by tightening the tightening screw portion 24, the pressing body 34 is moved toward the outer surface 15 of the inner tube 12 via the upper surface 44, which is the load-bearing surface of the pressing body 34, and the pressing body 34 is moved toward the inner tube 12 within the through slit 18 until the pressing surface 54 of each inclined portion 56 contacts the inclined inner surface 150 of the corresponding through slit 18.

[0072] In this case, since the first angle θ2 is greater than the second angle θ1, by further tightening the tightening screw portion 24, each inclined portion 56 is forcibly deformed so that the first angle θ2 becomes smaller, and the inclined inner surface 150 of the corresponding through slit 18 is used as a guide surface to press in and move the pressing body 34 within the through slit 18 toward the inner tube 12.

[0073] 40 , the pressing surfaces 54 of the inclined portions 56 come into contact with the outer peripheral surface 15 of the inner pipe 12, and the tightening screw portions 24 are further tightened, whereby the pressing bodies 34 fix and hold the outer pipe 14 to the inner pipe 12 in the longitudinal direction of the pipe. More specifically, the male threaded portions 26 of the tightening screw portions 24 are threadedly engaged with the female threaded portions 24 of the outer pipe 14, whereby the pressing end surfaces 54 are pressed against the outer peripheral surface 15 of the inner pipe 12 through the through slits 18 of the outer pipe 14, and the inner pipe 12 is moved until the diametrically opposite portion of the outer peripheral surface 15 of the inner pipe 12 comes into contact with the inner peripheral surface of the outer pipe 14. In this way, the inner pipe 12 is firmly fixed and supported to the outer pipe 14 by support at three points: the two pressing end surfaces 54 and one line contact extending in the longitudinal direction of the pipe. The length l from the upper surface 44 of the pressing portion 34 to the pressing surface 54 is set so that the pressing surface 54 of each inclined portion 56 can abut against the outer peripheral surface 15 of the inner tube 12. The predetermined value that is the difference between the intervals L2 and L1 can be determined from the perspective of being able to press-fit while using the inclined inner surface 150 of the corresponding through slit 18 as a guide surface and deforming each inclined portion 56 so that the first angle θ2 becomes small within the range in which the clamping screw portion 24 can be tightened by hand. For this purpose, the bending rigidity of the pressing body 34 can be set according to the material of the pressing body 34, the thickness T1 of the inclined portion 56, and the length l from the upper surface 44 of the pressing portion 34 to the pressing surface 54. For example, when the length l from the upper surface 44 of the pressing portion 34 to the pressing surface 54 is set to be long, the thickness T1 of the inclined portion 56 may be ensured, and when the Young's modulus of the material of the pressing body 34 is high, the length l from the upper surface 44 of the pressing portion 34 to the pressing surface 54 may be set to be long, or the thickness T1 of the inclined portion 56 may be set to be small. The V-shaped configuration of the pressing body 34 and the through slit 18 may be a curved configuration instead of a diagonal linear configuration, as long as the pressing body 34 can be press-fitted into the through slit 18, and in this case, the inclined outer surface 152 opposite the press-fitting surface may be a free-form surface shape, as long as a clearance can be secured during movement of the pressing body 34 within the through slit 18.

[0074] With the above configuration, by loosening the tightening screw portion 24, the pressing force at the contact portion of the pressing surface 54 of each inclined portion 56 against the outer peripheral surface 15 of the inner tube 12 weakens, the outer tube 14 is released from its longitudinal fixation relative to the inner tube 12, and the outer tube 14 is able to move longitudinally relative to the inner tube 12; however, the pressing body 34 and each inclined portion 56 are pressed and held against the corresponding inclined inner surface 150 by the force of returning to their original shape. Therefore, even if the tightening screw portion 24 falls off, or even if an attempt is made to remove the pressing body 34 upward from the through slit 18, it will come into contact with the inclined outer surface 152, and the pressing portion 22 will be held within the through slit 18, making it possible to prevent the pressing portion 34, which is a small item, from becoming separated from the inner and outer tubes 12 and 14. In addition, when the pressing portion 22 is deformed into an eight shape by press-fitting, the pressing surface 54 must be processed before deformation, taking into consideration the direction of the pressing surface 54 so that it abuts against the outer peripheral surface 15 of the inner tube 12.

[0075] As a variant, by setting the first angle θ2 to be larger than the first angle θ2, when the pressing body 34 is inserted into the through slit 18, it comes into contact with the inclined outer surface 152, and is pressed in so that the first angle θ2 becomes smaller, using the inclined outer surface 152 as a guide surface. In another modified example, an opening may be provided on the outer peripheral surface 16 of the outer tube 14 on the diametrically opposite side of the female threaded portion 20, and the male threaded portion 26 of the fastening screw 24 may be screwed into the female threaded portion 20 through the clearance hole 32 in the pressing plate. When the tip of the male threaded portion 26 protrudes from the inner peripheral surface of the outer tube 14, a processing tool may be inserted into the interior of the outer tube 14 through the opening to crimp the tip of the male threaded portion 26 to the extent that it does not interfere with the relative movement in the longitudinal direction of the fitting portion of the inner and outer tubes 12, 14, thereby forming a protrusion around the opening of the through slit 18 on the inner peripheral surface of the outer tube 14, thereby preventing the fastening screw 24 from being loosened too much and the pressing portion 22 of the pressing portion from completely coming out of the corresponding through slit 18.

[0076] A fourteenth 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 FIG. 41 . The fourteenth embodiment of the present invention is characterized in that, in the thirteenth embodiment, the pressing portions 22 are press-fitted into the corresponding through slits 18, so that even if the fastening screws 24 are loosened too much and the pressing portions 22 of the pressing portions 22 completely come out of the corresponding through slits 18, the pressing portions 22 are engaged and held in the pair of through slits 18, thereby effectively preventing detachment. However, in this embodiment, although the pressing portions 22 are prevented from detaching, an insertion rod is inserted into the pressing bodies 34 of the pressing portions 22. Hereinafter, the description will be given assuming that the tubular base portion 30 is fitted and fixed to the end of the outer tube 14, for example, by screwing. More specifically, as shown in FIG. 41 , of the pair of pressing bodies 34, the pressing body 34 closest to the end of the outer tube 14 on the fitting side between the outer tube 14 and the inner tube 12 has an insertion hole 204 formed in the thickness direction of the pressing body 34 from the side closest to the end of the outer tube 14 out of a pair of opposing side surfaces constituting the pressing body 34, and an elongated hole 202 with a circular cross section is formed in the end face 201 on the fitting side of the outer tube 14, having a circular opening in the end face 201 and extending all the way through to the side surface closest to the end of the outer tube 14, and an insertion rod 200 is further provided that can be inserted into the elongated hole 202 from the circular opening, and by inserting the pressing plate into the pair of through slits 18, the elongated hole 202 communicates with the insertion hole 204, and by inserting the tip 208 of the insertion rod 200 into the insertion hole 204, the pressing plate is held within the pair of through slits 18. The elongated hole 202 has a female threaded portion 206, and the insertion rod 200 is a set screw 200 of a fixed diameter that can be screwed into the female threaded portion 206 of the elongated hole 202.As the set screw 200 screws into the elongated hole 202, the tip portion 208 is inserted into the insertion hole 204, and the pressing plate is removably held within the pair of through slits 18.The insertion hole 204 has an elliptical cross section elongated in the direction of movement of the presser body 34 so that the presser body 34 can move within a predetermined range when the set screw 200 is inserted into the insertion hole 204, and does not have to penetrate the thickness of the presser body 34. The female thread portion 206 is provided over the entire length of the elongated hole 202, and the set screw 200 is inserted through the circular opening of the elongated hole 202 and threaded onto the female thread portion 206 until its tip protrudes into the insertion hole 204. As a variant, the female thread portion 206 does not have to be provided over the entire length of the elongated hole 202, but may instead be provided partway from the circular opening of the elongated hole 202 to a clearance hole through which the set screw 200 can be inserted, and may extend from the side surface near the end of the outer tube 14 to the side surface, which makes it possible to easily attach the set screw 200. Furthermore, instead of the set screw 200 having a male thread portion, an insertion rod 200 that can simply be inserted into the elongated hole 202 may be used, and in this case, the diameter of the insertion rod 200 needs to be such that it can be tightly fitted into the elongated hole 202. According to the above configuration, in the thirteenth embodiment, the pressing portion 22 has a V-shaped side cross section that widens from the upper surface 44 that forms the load-receiving surface toward the pressing surface 54, but while a metal pressing portion 22 requires a certain amount of work to machine, in this embodiment, the pressing portion 22 may have a U-shaped side cross section, and the machining is simple while still making it possible to effectively prevent the pressing portion 22 from falling off.

[0077] A fifteenth embodiment of the present invention will be described below. In the following description, components similar to those in 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 42 to 46. The fifteenth embodiment of the present invention is characterized in that, while in the above-mentioned embodiments the pressing body 34 is pressed against the outer peripheral surface 15 of the inner tube 12 by screw-in rotation using the fastening screw portion 24, in this embodiment a pressing lever mechanism 300 is used to press the pressing body 34 against the outer peripheral surface 15 of the inner tube 12 instead of the fastening screw portion 24.

[0078] The following description will be given assuming that the tubular base portion 30 is fitted and fixed to the end of the outer tube 14, for example, by screwing. The pressing lever mechanism 300 includes a pressing lever 301 that presses the pressing body 34 against the outer peripheral surface 15 of the inner tube 12, a pivot 306 that extends parallel to the outer tube 14 and allows 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 306 at a predetermined height from the outer peripheral surface of the outer tube 14 (tubular base portion). The pressing lever 301 is an integrated structure with a roughly tadpole cross section, and includes a grip lever portion 302 that is gripped with the fingers and a rotating portion 303 that rotates integrally with the grip lever portion 302 around the pivot 306, with the pivot 306 provided at the center of the rotating portion 303. More specifically, the rotating portion 303 is provided with a notch 310, which separates the rotating portion 303 into opposing rotating portions. A pin 304 is positioned within the notch 310. A pivot 306 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 306 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 L of the arm from the center O of the pivot 306 of the grip lever portion 302 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 308, and while the pressing lever 301 rotates around the pivot 306 between a non-pressing circumferential position and a pressing circumferential position, one of the portions of the curved peripheral surface 308 is held in contact with the upper surface 44 of the pressing body 34, so that the rotation of the pressing lever 301 causes the pressing body 34 to move in the thickness direction of the outer tube 14 within the through slit 18.

[0079] 44 , in the curved peripheral surface 308, the distance between the center O of the pivot 306 and the upper surface 44 of the pressing body 34 is R1 at the non-pressing circumferential position, the distance between the center O of the pivot 306 and the upper surface of the pressing body 34 is R2 at the pressing start circumferential position ( FIG. 42 ), and the distance between the center O of the pivot 306 and the upper surface of the pressing body 34 at the pressing end circumferential position, where R1 > R2 > R3, is set so that the pressing body 34 is pressed against the outer peripheral surface 15 of the inner tube 12 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 34 is sufficient to fix and hold the inner and outer tubes 12, 14 together. For example, if the thickness of the outer tube 14 is several millimeters, the difference between R2 and R3 is about one-twentieth to one-tenth of that thickness. The curved circumferential surface 308 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 306 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 308 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 302 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 302 is oriented close to the outer peripheral surface of the outer tube 14 so that it does not protrude from the outer peripheral surface of the outer tube 14 and get in the way, and the curved shape of the grip lever portion 302 is preferably determined so that a space 314 is formed between the inner surface 316 of the grip lever portion 302 and the outer peripheral surface of the outer tube 14 where a finger can be inserted.

[0080] The pin 304 has its lower end screwed to the outer circumferential surface 16 of the outer tube 14 so that it stands upright, and is provided with a through-hole (not shown) midway through the pin 304 through which the pivot 306 can pass. By adjusting the amount of screwing at the lower end, the height of the pivot 306 from the outer circumferential surface 16 of the outer tube 14 can be adjusted. According to the above configuration, by adjusting the amount by which the pin 304 is screwed into the outer tube 14, the height of the pivot 306 relative to the outer peripheral surface 16 of the outer tube 14 can be adjusted, and then the pressing lever 301 can be rotated around the pivot 306 from the non-pressing circumferential position to the pressing circumferential position, so that the pressing body 34 is pressed against the outer peripheral surface 15 of the inner tube 12 via the curved circumferential surface 308 of the rotating part 303. Compared to the first to eleventh embodiments which use screw-type rotation by the fastening screw part 24, 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 the inner and outer tubes 12, 14 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, the inner and outer tubes 12, 14 can be moved relative to each other in the longitudinal direction of the tubes. As a modified example, the pin 304 and the pivot 306 may be integrally formed. That is, without providing a through-hole for the pivot 306 in the pin 304, the pivots 306 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 306 from the outer peripheral surface 16 of the outer tube 14 is not required, the pin 304 may be fixed without providing a rotatable threaded portion at its lower end.

[0081] Modified examples of the pin 304 are shown in Figure 47. In Figure 47, Figure 47(A) shows a case where the male thread portion 310 and the main body portion 322 are integrated, and Figure 47(B) shows a case where the male thread portion 310 and the main body portion 322 are separate. In both cases, the height of the main body 322, i.e., the pivot 306 fitted into the through hole 318, relative to the outer tube 14 or the outer peripheral surface 16 of the tubular base portion 30 fitted into the outer tube 14 can be adjusted by adjusting the amount of threading of the male thread portion 310 into the female thread portion 326 of the outer tube 14 or the tubular base portion 30 fitted into the outer tube 14. Thus, the pressing force of the pressing body against the outer peripheral surface 15 of the inner tube 12 when the pressing lever 300 is pressed down and the distance between the tip 312 and the outer peripheral surface 16 of the outer tube 14 or the tubular base portion 30 fitted into the outer tube 14 when pressing by the pressing lever 300 is completed can be adjusted, but they differ in the following points.

[0082] In Figure 47(A), to adjust the amount of screwing, pin 304 is rotated, which changes the installation orientation of pressing lever 300 fixed to pin 304 via pivot 306, and therefore this is suitable when the amount of screwing adjustment is small. On the other hand, in Figure 47(B), male threaded portion 310 is inserted into hollow portion 320 of main body portion 322, protrudes from clear hole 328 in bottom surface 324 of main body portion 322, and is threaded into female threaded portion 326, so that main body portion 322 is supported rotatably relative to male threaded portion 310. The diameter of male threaded portion 310 is set smaller than the diameter of hollow portion 320 so that it can be inserted into hollow portion 320. In this case, by pressing down the pressing lever 300, the main body 322 is pulled upward via the pivot 306, and the bottom surface 324 of the main body 322 comes into contact with the underside of the head portion 330 of the male screw portion 310, so that the main body 322 does not rotate together with the rotation of the male screw portion 310 and can be firmly fixed to the male screw portion 310. Therefore, even if the screw-in adjustment amount is large, when the pressing lever 300 is pressed down, the pressing lever 300 can be firmly fixed to the male screw portion 310 in the up-down direction without changing the installation orientation of the pressing lever 300.

[0083] As described above, this embodiment has a pressing lever mechanism 300 having an annular circumferential surface 308 that rotates around an axis parallel to the load receiving surface while contacting the load receiving surface, and the annular circumferential surface 308 is curved such that the radius from the axis increases from a first radius to a second radius, and by rotating the lever of the pressing lever 300, a pair of pressing bodies 34 can move in the thickness direction of the corresponding through slits 18, and by rotating the lever of the pressing lever mechanism 300 around an axis provided at a predetermined height from the outer circumferential surface 16 of the outer tube 14, the pressing bodies 34 move towards the outer circumferential surface 15 of the inner tube 12 at a rotation position corresponding to an intermediate radius between the first radius and the second radius. As soon as pressing begins, the pressing body 34 finishes pressing toward the outer peripheral surface 15 of the inner tube 12 at a rotational position corresponding to the second radius, bringing the pressing end face into surface contact with the outer peripheral surface 15 of the inner tube 12, and the outer peripheral surface 15 of the inner tube 12 on the opposite side of the surface contact portion of the pressing end face with the inner tube 12 is pressed and fixed against the inner peripheral surface of the outer tube 14. Therefore, there is no need to increase the diameter of the head portion 58 of the fastening screw portion 24 of the first embodiment, and advanced machining to make the pressing body 34 of the thirteenth embodiment into a V-shaped type is not necessary. Furthermore, even if the set screw 200 of the fourteenth embodiment, which requires time-consuming screwing, is omitted, pressing can be done manually with a large torque with a single touch without the parts coming apart.

[0084] The pressing lever mechanism 300 can also be applied when one of the pair of pressing bodies 34 has a different installation orientation than the other, as in Figure 23 of the first embodiment, and when the above-mentioned screw-in type is used for the pin 304, by using a pair of pressing bodies 34 with a V-shaped cross section of the 13th embodiment or the set screw 200 of the 14th embodiment, even if the pin 304 happens to come off the outer tube 14, it is possible to effectively prevent the pair of pressing bodies 34 from detaching from the outer tube 14 and coming apart.

[0085] In the ninth embodiment, the application has been described as an earthquake prevention stop, in the tenth embodiment as a stand for solar panels, in the eleventh embodiment as a traffic sign, and in the twelfth embodiment as a steel pan or microphone stand, respectively, as a length adjustment jig for inner and outer tubes, an integrated fixing support jig, and an integrated fixing holding jig, but other application examples are shown below.

[0086] Figure 48 shows an example in which this is applied to a music stand 400. The fixing and supporting jig for the inner and outer tubes employs the thirteenth embodiment. That is, by employing a fastening screw 24 that can be tightened by hand and a pressing body 34 with a V-shaped cross section, the mating portions of the inner and outer tubes 12, 14 can be fixed and held in place by tightening the fastening screw 24 without being noticeable externally. This reliably prevents the music stand 402 from slipping downward during performance, for example. Furthermore, when adjusting the height of the music stand 402, even if the fastening screw 24 is loosened and the fastening screw 24 comes off the female thread of the outer tube 14, the pressing body 34 remains held within the through slit 18. Furthermore, by applying a fixing support jig for the inner and outer tubes between one end of each tripod section 404 of the support part of the stand 400 and the outer tube 14, each tripod section 404 can be made openable and closable. When used for performance, one end of each tripod section 404 can be moved downward relative to the outer tube 14 to open each tripod section 404 and enable it to be supported as a stand. On the other hand, when storing or transporting, one end of each tripod section 404 can be moved upward relative to the outer tube 14 to close each tripod section 404 to prevent it from becoming bulky.

[0087] 49 shows an example of application to a bicycle. The fixing and supporting jig for the inner and outer tubes 12, 14 employs the 15th embodiment. In other words, by adopting a pressure lever mechanism 300 that can be pressed down manually, when adjusting the height of the saddle 502 and / or handlebars 504, the fitting length of the inner and outer tubes 12, 14 can be adjusted and the fitting portions of the inner and outer tubes 12, 14 can be fixed and held in place with a single touch, which can reliably prevent the saddle 502 and / or handlebars 504 from slipping downward while riding the bicycle, and when adjusting the height of the saddle 502 and / or handlebars 504 again, the lever of the pressure lever mechanism 300 can be pushed up in the opposite direction with a single touch, allowing the inner and outer tubes 12, 14 to move freely relative to each other, and the pressing force of the outer tube 14 against the inner tube 12 when the lever of the pressure lever mechanism 300 is pressed down can be adjusted by the shape of the rotating portion 303 of the pressure lever mechanism 300 or the amount that the pin 304 is screwed into the outer tube 14 or the tubular base portion 30.

[0088] Figure 50 shows an example of application to a table. The fixing and supporting jig for the inner and outer tubes 12, 14 employs the thirteenth embodiment. That is, each of the four legs 604 of the table body 602 employs a V-shaped presser body 34 along with a manually tightenable fastening screw 24. By facing the fastening screw 24 inward below the table, it is not noticeable from the outside, and by tightening the fastening screw 24, the mating portions of the inner and outer tubes 12, 14 can be fixed and held in place. This table is suitable not only as a decorative table indoors, but also as a temporary dining table for outdoor activities using a tent. By shortening the length of the legs, it can be transported to the site without becoming bulky.

[0089] Figure 51 shows an example of application to a temporary tent frame. The fixing and supporting jig for the inner and outer tubes 12, 14 employs the fifteenth embodiment. Specifically, in a temporary tent frame in which a three-dimensional framework is formed by fitting together multiple sets of inner and outer tubes 12, 14, the use of a manually depressed pressing lever mechanism 300 allows the fitting length of the inner and outer tubes 12, 14 to be adjusted and the fitting portions of the inner and outer tubes 12, 14 to be fixed and held in place with a single touch during assembly of the temporary tent. This reliably prevents the three-dimensional framework from collapsing, even in bad weather or strong winds. Furthermore, when disassembling the frame, the inner and outer tubes 12, 14 can be freely moved relative to each other by simply pushing up the lever of the pressing lever mechanism 300 in the opposite direction with a single touch, allowing for easy disassembly of multiple sets of inner and outer tubes 12, 14. In this case, the pressing force of the outer tube 14 against the inner tube when the lever of the pressing lever mechanism 300 is pressed down can be adjusted by the shape of the rotating part 303 of the pressing lever mechanism 300 or the amount by which the pin 304 is screwed into the outer tube 14 or the tubular base part 30. Furthermore, when transporting to the site, the fitting length of the inner and outer tubes 12, 14 can be adjusted to make the temporary tent frame smaller, allowing it to be transported without being bulky.

[0090] 52 and 53 show an example of application to a stab. The fixing and supporting jig for the inner and outer tubes 12, 14 employs the fifteenth embodiment. Specifically, the stab has inner and outer tubes 12, 14 that fit together, with the outer tube 14 having a grip portion 804 at the tip and the inner tube 12 having a U-shaped portion 802 at the tip. By employing a manually depressable pressing lever mechanism 300, the fitting length of the inner and outer tubes 12, 14 can be adjusted and the fitting portions of the inner and outer tubes 12, 14 can be fixed and held in place with a single touch when adjusting the overall length of the stab. For example, when pressing the U-shaped portion 802 at the tip of the inner tube of the stab against an opponent, the fitting portions of the inner and outer tubes 12, 14 can be securely fixed and held in place. Furthermore, when adjusting the overall length of the stab again, the lever of the pressing lever mechanism 300 can be pushed up in the opposite direction with a single touch, allowing the inner and outer tubes 12, 14 to freely move relative to each other. In particular, in the case of a fork, for example, the U-shaped portion 802 may be pinched and twisted against the body of an attacking opponent, and it is important to prevent relative longitudinal rotation between the inner and outer tubes 12, 14. The force with which the outer tube 14 is pressed against the inner tube when the lever of the pressing lever mechanism 300 is pressed down can be increased by varying the shape of the rotating portion 303 of the pressing lever mechanism 300 or the amount by which the pin 304 is screwed into the outer tube 14 or the tubular base portion 30. In this regard, to further prevent relative longitudinal rotation between the inner and outer tubes 12, 14, as in the first embodiment, a long groove 130 or a plurality of holes 128 spaced apart from one another in the longitudinal direction may be provided on the outer circumferential surface 15 of the inner tube 12, and the tip of the tightening screw portion 24 may be inserted into the long groove 130 or a predetermined hole 128 for reinforcement. 53 shows a modified example in which the orientation of the pressing lever mechanism 300 is changed from a direction perpendicular to the extension direction of the inner and outer casings 12 and 14 to a direction along the extension direction of the inner and outer casings 12 and 14.

[0091] In order to confirm the effects of the present invention, the inventors manufactured a prototype and conducted a limit load test. The prototype consisted of a metal or resin inner tube 12, an outer tube 14 that fitted onto the inner tube 12, a tubular portion 102 that was firmly fixed to the end of the outer tube 14 and had a female threaded portion 72 and a pair of through slits 18 on either side of the female threaded portion 72, a metal pressing body with a U-shaped cross section and an overhanging hole 32, and a fastening screw with a male threaded portion 26 that threadedly engaged with the female threaded portion 72 of the outer tube 14 via the overhanging hole 32 of the pressing body. For comparison, a conventional jig was prepared in which a pair of overhanging flanges 116 facing each other in the longitudinal direction of the pipe were provided on the tubular portion 102, and a fastening screw was tightened into the female threaded portions 72 provided on each overhanging flange 116 to narrow the clearance between the pair of overhanging flanges 116, thereby pressing the inner circumferential surface of the outer pipe 14 against the outer circumferential surface 15 of the inner pipe 12. The specific test method involved applying a predetermined torque to the screw with a hammer wrench, pressing the pressing surface of the pressing body against the outer circumferential surface 15 of the inner pipe 12, and placing the lower end of the outer pipe 14 on a horizontal test stand to fix the integrated structure of the inner and outer pipes 12, 14 upright via the tubular portion 102. A compressive load was applied from the upper end of the inner pipe 12 in the vertical direction, which is the extension direction of the inner and outer pipes, and the critical compressive load at which the outer pipe 14 began to move relative to the inner pipe 12 was measured. For each of several types of prototypes, the change in limit compressive load was determined using a specified torque as a parameter.

[0092] The test conditions are shown in Figure 29, and the test results are shown in Figures 30 to 32. In all cases, as the load was applied, a slight compression specific to the material of the prototype occurred, and a limit load was reached at which the prototype could no longer firmly support the inner and outer tubes 12, 14. After that, the load decreased as the prototype moved, and in this test, the limit load under a specified torque was measured.

[0093] As shown in Figure 29, assuming an outer tube 14 made of brass, 32φ, 4mm thick, and an inner tube 12 made of brass with an M10 screw (1.5mm pitch), the torque is approximately 30N, resulting in a limit load of approximately 400kg. It was confirmed that mechanical torque application is sufficient for use not only in stands for everyday items, but also in outdoor industrial stands, such as solar panel stands. Furthermore, according to these results, for a load of 100kg, the required torque is approximately 7.5N, a quarter of 30N, which is approximately five times the maximum manual torque of 1.6N. Therefore, by increasing the grip diameter by five times, it was confirmed that it is practically possible to apply a torque sufficient to withstand a load of 100kg by gripping it by hand and using manual force. 30 to 32, for a maximum manual torque of 1.6 N, the limit support load of the conventional product is approximately 200 N, while the limit support load of the prototype in this example is 800 N, which is about four times as much; for a torque of 0.8 N within the manual force range, the limit support load of the ABS resin inner and outer tubes 12, 14 is approximately 90 N, while the limit support load of the prototype in this example is 270 N, which is about three times as much; and it was confirmed that in the case of the ABS resin inner and outer tubes 12, 14, shallow scratch-like depressions were formed in the longitudinal direction of the tube at the contact portion of the pressing surface on the outer surface of the inner tube 12.

[0043] In addition, when the inner pipe 12 is made of resin, the pressing surface of the pressing body 34 is pressed against the outer peripheral surface 15 of the inner pipe 12 when the fastening screws are tightened. Therefore, if the area of ​​the pressing surface is too small, the pressing pressure against the outer peripheral surface 15 of the inner pipe 12 increases. Even if the thickness of the inner pipe 12 is sufficient to prevent deformation of the inner pipe 12 itself when supporting a load in the longitudinal direction of the inner and outer pipes 12, 14, scratches or even dents may occur on the outer peripheral surface 15 of the inner pipe 12. Therefore, it is presumed that it is best to adjust the area of ​​the pressing surface of the pressing body 34, taking into account the hardness of the resin of the inner pipe 12, so that the pressing pressure is within a range that prevents damage to the outer peripheral surface 15 of the inner pipe 12 even when the fastening screws are tightened by hand. As described above, this test confirmed that stable load support by hand force within a practical range is possible by selecting the diameter of the torque-applying grip 132 according to the support load.

[0094]

[0046] While the embodiments of the present invention have been described above in detail, those skilled in the art can make various modifications and changes without departing from the scope of the present invention. For example, in the first embodiment, from the viewpoint of protecting the outer surface of the inner pipe 12, the tip of the male thread portion 26 of the fastening screw portion 24 passes through the female thread portion 20 of the outer pipe 14 or the tubular base portion 102 so as not to come into contact with the outer surface of the inner pipe 12. However, the present invention is not limited to this. When the inner and outer pipes 12, 14 are made of metal, the tip of the male thread portion 26 of the fastening screw portion 24 comes into contact with the outer surface of the inner pipe 12 in addition to the pressing surface 54 of the pressing body 34, thereby more firmly fixing the outer pipe 14 to the inner pipe 12. This is effective for supporting a heavy object at a predetermined height by either the inner or outer pipe 12, 14, when the inner and outer pipes 12, 14 are oriented vertically. For example, in the third embodiment, a single through slit 18 is provided on the outer peripheral surface 1616 of the outer tube 14 within a predetermined distance from the female thread portion 20, but this is not limited to this. As in the second embodiment, a tubular base portion 30 may be provided that is attached and fixed to one end of the outer tube 14, and a single through slit 18 may be provided on the outer peripheral surface 16 of the tubular base portion 30 within a predetermined distance from the female thread portion 20.

[0095] For example, in the first embodiment, it has been described that the clamping screw portion 24 has the male thread portion 26 and the head portion 58 that is gripped and rotated with the fingers, while the female thread portion 20 is provided on the outer peripheral surface 1616 of the outer tube 14, but this is not limited thereto, and the male thread portion 26 may be provided on the outer peripheral surface 1616 of the outer tube 14, while the clamping screw portion 24 may be in the form of a nut that screws onto the male thread portion 26. For example, in the first embodiment, it has been described that a single length adjustment jig is provided at a predetermined position on the inner and outer tubes 12, 14, but this is not limited thereto, and for example, when a pair of through slits 18 are provided at intervals in the longitudinal direction of the inner and outer tubes 12, 14, multiple pairs of such pairs of through slits 18 may be provided in the circumferential direction of the inner and outer tubes 12, 14, and multiple pressing portions 22 may be provided accordingly. In addition, the second to seventh embodiments may be combined in any manner. For example, if the outer tube 14 is thin and the outer peripheral surface of the inner tube 12 is slippery, a tubular protrusion 65 may be provided on the outer peripheral surface 1616 of the outer tube 14, and a protective plate 78 may be provided between the inner tube 12 and the outer tube 14. For example, if the inner and outer tubes 12, 14 need to be held fixed for a long period of time while suppressing relative rotation in the extension direction between them, a coil spring 76 may be provided between the outer peripheral surface 1616 of the outer tube 14 and the pressing portion 22, and the direction of the pair of through slits 18 and the female screw portion 20 between the pair of through slits 18 may be oblique to the extension direction of the inner tube 12 and the outer tube 14.

[0096] FIG. 1 is a partial perspective view of an outer tube 14 of a length adjustment jig according to a first embodiment of the present invention. FIG. 2 is a perspective view of a fastening screw portion 24 of a length adjustment jig according to a first embodiment of the present invention. FIG. 3 is a perspective view of a pressing body 34 of a length adjustment jig according to a first embodiment of the present invention. FIG. 4 is a perspective view of a pressing body 34 of a length adjustment jig according to a first embodiment of the present invention. FIG. 5 is a horizontal sectional view of a length adjustment jig according to a first embodiment of the present invention. FIG. 6 is a vertical sectional view of a length adjustment jig according to a first embodiment of the present invention. FIG. 7 is a schematic sectional view of a length adjustment jig according to a first embodiment of the present invention. FIG. 8 is a perspective view of a length adjustment jig according to a second embodiment of the present invention. FIG. 9 is a perspective view of a length adjustment jig according to a second embodiment of the present invention. FIG. 10 is a view similar to FIG. 6 of a length adjustment jig according to a second embodiment of the present invention. FIG. 11 is an exploded perspective view of a length adjustment jig according to a third embodiment of the present invention. FIG. 12 is an exploded perspective view of a length adjustment jig according to a fourth embodiment of the present invention. FIG. 13 is an exploded perspective view of a length adjustment jig according to a fourth embodiment of the present invention. FIG. 14 is an exploded perspective view of a length adjustment jig according to a fifth embodiment of the present invention. FIG. 15 is an exploded perspective view of a length adjustment jig according to a sixth embodiment of the present invention. FIG. 16 is an exploded perspective view of a length adjustment jig according to a sixth embodiment of the present invention. FIG. 17 is an exploded perspective view of a length adjustment jig according to a modification of the sixth embodiment of the present invention. FIG. 18 is a perspective view of a length adjustment jig according to a seventh embodiment of the present invention. FIG. 1 is a perspective view of a length adjustment jig according to a first embodiment of the present invention when applied to a musical instrument stand. FIG. 2 is a perspective view of a length adjustment jig according to a first embodiment of the present invention when applied to a microphone stand. FIG. 3 is a view similar to FIG. 1 of a length adjustment jig according to an eighth embodiment of the present invention. FIG. 4 is a perspective view of a length adjustment jig according to a ninth embodiment of the present invention when applied to an earthquake brace. FIG. 5 is a perspective view of a modified example of the length adjustment jig according to the first embodiment of the present invention. FIG. 6 is a perspective view of a device for adjusting the support and tilt angle of a rectangular plate-shaped heavy object according to a tenth embodiment of the present invention. FIG. 7 is a partially enlarged perspective view of the tilt angle adjustment jig of the device for adjusting the support and tilt angle of a rectangular plate-shaped heavy object according to the tenth embodiment of the present invention. FIG. 8 is a partial cross-sectional view taken along line A-A of the tilt angle adjustment jig of the device for adjusting the support and tilt angle of a rectangular plate-shaped heavy object according to the tenth embodiment of the present invention. FIG. 9 is a perspective view of a device for adjusting the orientation and position of a traffic sign T according to an eleventh embodiment of the present invention. FIG. 11 is a perspective view of a modified example of the device for adjusting the orientation and position of a traffic sign T according to the eleventh embodiment of the present invention.It is a table showing the test conditions of the ultimate support load measurement test. It is a graph showing the results of the ultimate support load measurement test with the support load on the vertical axis and the displacement on the horizontal axis. It is a graph showing the results of the ultimate support load measurement test with the support load on the vertical axis and the displacement on the horizontal axis. It is a graph showing the results of the ultimate support load measurement test with the support load on the vertical axis and the displacement on the horizontal axis. It is a perspective view of the inner and outer pipes around the length adjustment jig according to a modified example of the first embodiment of the present invention. It is a side sectional view of the inner and outer pipes around the length adjustment jig according to a modified example of the first embodiment of the present invention. It is a perspective view of the inner and outer pipes around the length adjustment jig according to another modified example of the first embodiment of the present invention. It is a partially enlarged perspective view of the length adjustment jig in FIG. 19. It is a perspective view of the folded state of the stand in FIG. 19. It is a partial side sectional view of the inner and outer pipes around the length adjustment jig according to the 13th embodiment of the present invention It is a partial side sectional view of the inner and outer pipes around the length adjustment jig according to the 13th embodiment of the present invention. It is a partial side sectional view of the inner and outer pipes around the length adjustment jig according to the 13th embodiment of the present invention. It is a partial side sectional view of the inner and outer pipes around the length adjustment jig according to the 14th embodiment of the present invention. It is a partial perspective view of the length adjustment jig according to the 15th embodiment of the present invention. It is a partial perspective view of the length adjustment jig according to the 15th embodiment of the present invention. It is a front view of the length adjustment jig according to the 15th embodiment of the present invention. It is a sectional view taken along line A-A in FIG. 42 according to the 15th embodiment of the present invention. It is a front view corresponding to FIG. 44 of a modified example according to the 15th embodiment of the present invention. It is a partial sectional view and a partial perspective view of a modified example of the pin 304 of the present invention. It is an overall perspective view of the fixed holding jig of the present invention applied to the drawing stand. It is an overall perspective view of the fixed holding jig of the present invention applied to the bicycle. It is an overall perspective view of the fixed holding jig of the present invention applied to the table. It is an overall perspective view of the fixed holding jig of the present invention applied to the tent frame. It is an overall perspective view of the fixed holding jig of the present invention applied to the thigh stab. It is an overall perspective view of a modified example of the fixed holding jig of the present invention applied to the thigh stab.

[0097] D: Distance between pair of slits W: Rectangular plate-shaped heavy load P: Plane formed by both support bars θ: Inclined angle R1: Minimum radius R2: Intermediate radius R3: Maximum radius L: Length of pressing lever 10: Length adjusting jig 12: Inner tube 14: Outer tube 15: Outer peripheral surface 16: Outer peripheral surface 17: Inner peripheral surface 18: Through slit 20: Female threaded portion 22: Pressing portion 24: Fastening screw portion 26: Male threaded portion 28: One end portion 30: Tubular base portion 32: Clear hole portion 34: Pressing body 34 36: Shank portion 38: Undersurface 40: Annular surface 42: Projection portion 44: Upper surface 46: Contact surface 48: Central portion 50: End portion 54: Pressing surface 56: Inclined portion 58: Head portion 65: Tubular projection portion 70: Nut portion 72: Female threaded portion 74: Male threaded portion 76 Coil spring 78 Protective plate 80 Shallow groove 82 Elastic portion 84 Shelf-side fixing portion 86 Abutment surface 88 Receiving portion 89 Abutment surface 90 Ceiling-side fixing portion 92 Abutment surface 94 Receiving portion 96 Lower end surface 98 Upper end surface 100 Device for supporting and adjusting the tilt angle of a rectangular plate-shaped heavy object 101 Tilt angle adjusting jig 102 Tubular portion 104 First support bar 106 Upper end 108 Pivot 110 Lower end 112 Second support bar 114 Tip surface 116 Pair of protruding flanges 118 End portion 120 First through hole 122 Second through hole 124 X-shaped cross member 126 Diagonal tube 128 Hole 130 Narrow groove 132 Torque-applying grip 140 Inner peripheral surface 142 Outer surface 154 Opening 200 Set screw 201 End surface 202 Slot 204 Insertion hole 206 Female thread portion 208 Tip portion 300 Pressing lever mechanism 302 Grip lever portion 303 Rotating portion 304 Pin 306 Pivot 308 Curved peripheral surface 310 Notch 312 Tip 314 Space 316 Inner surface 318 Through hole 320 Hollow portion 324 Bottom surface 326 Female thread portion 328 Clear hole 330 Head portion 332 Recess 334 Opening 400 Music stand stand 402 Music stand 404 Tripod portion 500 Bicycle 502 Saddle 600 Table 602 Table surface 700 Temporary tent frame 702 Leg 704 Roof 800 Fork 802 U-shaped part 804 Grip part

Claims

1. A step of machining, 3D printer modeling, or lost wax processing a pair of through slits and a female screw portion on the outer surface of a solid or hollow inner tube and a hollow outer tube that fit together, which corresponds to the fitting portion of the outer tube; and a step of preparing a pressing portion having a U-shaped cross section that penetrates the pair of through slits from the outside of the outer surface and can be pressed against the outer circumferential surface of the inner tube in a tight contact manner by surface contact at two points, the pressing portion having a clearance hole, and a tightening screw portion equipped with a female screw portion that can be screwed into the female screw portion and a torque applying grip that applies rotation around the extension direction of the male screw portion, wherein the diameter of the torque applying grip is selected according to the supporting load so that it can be firmly supported by hand force alone, and at a predetermined fitting position, by manually tightening the fastening screw portion via a torque-applying grip, the male threaded portion is screwed into the female threaded portion through the clear hole, thereby pressing and fixing the pressing portion toward the outer circumferential surface of the inner tube in a surface contact manner, and pressing and fixing the outer circumferential surface of the inner tube opposite to the surface contact portion of the pressing portion with the inner tube against the inner circumferential surface of the outer tube, thereby constituting an overall length adjustment jig for the inner and outer tubes, or an inclination angle adjustment jig by adjusting the fitting position of the inner and outer tubes by rotatably connecting the inner and outer tubes via a pivot, or an inner and outer tube integrally fixing and holding jig that fixes and holds the inner and outer tubes together, or a fixed support jig for a stand that supports and fixes a heavy object with either the inner or outer tube.

2. A tubular section having an outer circumferential surface with a female thread and at least one through hole within a predetermined range from the female thread, a first support bar extending at a predetermined angle to the extension direction of the tubular section and having a lower end grounded, and a pivot connecting the upper end of the first support bar to the tubular section, the upper end of the first support bar being rotatably connected to the tubular section around the pivot, a second support bar slidably fitted into the tubular section, extending along the extension direction of the tubular section and having a lower end grounded, at least one pressing portion passing through the through hole from the outer circumferential surface of the tubular base section and abutting against the outer circumferential surface of the second support bar, and a tightening screw portion capable of pressing and fixing the pressing portion against the outer circumferential surface of the second support bar, the tip surface of the pressing portion being shaped to follow the outer circumferential surface of the second support bar so as to be in surface contact with the outer circumferential surface of the second support bar, the clamping screw portion has a male threaded portion that can be screwed into the female threaded portion, and the pressing portion has a clearance hole through which the male threaded portion can pass, and by moving the first support bar within a plane formed by both support bars so that the distance between the lower ends of both support bars changes, the upper end of the first support bar rotates around the pivot relative to the tubular portion while adjusting the fitting position of the tubular base portion relative to the second support bar, and then the male threaded portion is screwed into the female threaded portion via the clearance hole using the clamping screw portion, while the pressing portion is caused to pass through the through hole, and the tip surface is pressed and fixed against the outer circumferential surface of the second support bar in a surface-to-surface contact manner, thereby making it possible to adjust the inclination angle of the second support bar with respect to the ground surface.

3. The inclination angle adjustment jig described in claim 2, wherein the tubular portion further has a pair of opposing overhanging flanges that overhang from its outer surface in a direction intersecting the extension direction of the tubular portion, the pair of overhanging flanges each having a first through hole capable of receiving a corresponding end of the pivot, the upper end of the first support bar is provided with a second through hole through which the pivot can pass in a direction intersecting the extension direction of the first support bar, the upper end of the first support bar is positioned between the pair of overhanging flanges so that the first through hole and the second through hole are aligned, and the pivot is provided passing through each of the first through holes and the second through hole.

4. A device for supporting and adjusting the tilt angle of a rectangular plate-shaped weight, characterized in that a pair of the tilt angle adjustment devices as described in claim 2 are provided so that the planes formed by both support bars are parallel, each of the opposing edges of the rectangular plate-shaped weight is supported by the second support bar of each of the tilt angle adjustment devices, and the rectangular plate-shaped weight is supported at four points by the lower ends of the first support bars and the lower ends of the second support bars of each of the tilt angle adjustment devices, and the tilt angle of the rectangular surface of the rectangular plate-shaped weight is adjusted by adjusting the fitting position of the tubular base part of each of the tilt angle adjustment devices relative to the corresponding second support bar of each of the tilt angle adjustment devices to adjust the tilt angle of the corresponding second support bar of each of the tilt angle adjustment devices.

5. A step of machining, 3D printer modeling, or lost wax processing a pair of through slits on the outer surface of a solid or hollow inner tube and a hollow outer tube that fit together, which corresponds to the fitting portion of the outer tube; and a step of preparing a press plate having a load receiving surface that receives a load toward the inner tube and a pair of pressing bodies that extend from the opposite surface of the load receiving surface toward the opposite surface of the load receiving surface, each of the pair of pressing bodies having a pressing surface at its tip that can abut against the outer circumferential surface of the inner tube, the step of deforming the pair of pressing bodies so that the spacing between the tips of the pair of pressing bodies changes, so that the inner or outer surface of the through slit corresponding to each of the pair of pressing bodies can be pressed in while forming a guide surface, the bending rigidity at the tip of each of the pair of pressing bodies is set according to the material of the press plate, the length to the tip of each of the pair of pressing bodies, and the area of ​​each of the pressing surfaces; and at a predetermined fitting position, by manually pressing and fixing the pressing portion toward the outer peripheral surface of the inner tube in a surface contact manner, and pressing and fixing the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing portion with respect to the inner tube against the inner peripheral surface of the outer tube, thereby constituting an overall length adjustment jig for the inner and outer tubes, or an inclination angle adjustment jig that rotatably connects the inner and outer tubes via a pivot and adjusts the fitting position of the inner and outer tubes, or an inner and outer tube integrally fixing and holding jig that fixes the inner and outer tubes together, or a fixed support jig for a stand that supports and fixes a heavy object with either the inner or outer tube, and completing the manufacturing method of an integrated structure of inner and outer tubes, characterized in that it includes a step of fixing the inner tube and outer tube together in the longitudinal direction of the tubes.

6. A step of machining, 3D printer modeling, or lost wax processing a pair of through slits on the outer surface of a solid or hollow inner tube and a hollow outer tube that fit together, on the outer surface corresponding to the fitting portion of the outer tube; and a step of preparing a press plate having a load receiving surface that receives a load toward the inner tube and a pair of pressing bodies each extending from the opposite side of the load receiving surface toward the opposite side of the load receiving surface, each of the pair of pressing bodies having a pressing surface at a tip portion that can abut against the outer circumferential surface of the inner tube, wherein the inner or outer side of the through slit corresponding to each of the pair of pressing bodies forms a guide surface so that each of the pair of pressing bodies can be pressed in, and a first angle of each of the pair of pressing bodies relative to the load receiving surface in the extension direction to the tip portion is set to be different from a second angle of the corresponding through slit relative to the outer circumferential surface of the inner tube in the extension direction; a bending rigidity at the tip of each of the pair of pressing bodies is set according to a material of the pressing plate, a length to a tip of each of the pair of pressing bodies, and an area of ​​each of the pressing surfaces, so that the first angle can be changed by deformation of each of the pair of pressing bodies by manual force and the pair of pressing bodies can be pressed into the corresponding through slit; and at a predetermined fitting position, by manually pressing and fixing the pressing portion toward the outer peripheral surface of the inner tube in a surface contact manner, and pressing and fixing the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing portion with respect to the inner tube against the inner peripheral surface of the outer tube, thereby constituting an overall length adjustment jig for the inner and outer tubes, or an inclination angle adjustment jig that rotatably connects the inner and outer tubes via a pivot and adjusts the fitting position of the inner and outer tubes, or an inner and outer tube integrally fixing and holding jig that fixes the inner and outer tubes together, or a fixed support jig for a stand that supports and fixes a heavy object with either the inner or outer tube, and completing the manufacturing method of an integrated structure of inner and outer tubes, characterized in that it includes a step of fixing the inner tube and outer tube together in the longitudinal direction of the tubes.

7. A method for manufacturing an integrated structure of inner and outer tubes as described in claim 6, wherein the pressing plate has a U-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits have a V-shaped cross section along the extension direction of the inner and outer tubes.

8. A method for manufacturing an integrated structure of inner and outer tubes as described in claim 6, wherein the pressing plate has a U-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits have curved V-shaped cross sections along the extension direction of the inner and outer tubes.

9. A method for manufacturing an integrated structure of inner and outer tubes as described in claim 6, wherein the pressing plate has a V-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits have a U-shaped cross section along the extension direction of the inner and outer tubes.

10. A method for manufacturing an integrated structure of inner and outer tubes as described in claim 6, wherein the cross section of the pressing plate along the extension direction of the inner and outer tubes is curved in a V-shape, and the pair of through slits have a U-shaped cross section along the extension direction of the inner and outer tubes.

11. A method for manufacturing an integrated structure of inner and outer tubes as described in claim 6, wherein the pressing plate has a V-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits have a V-shaped cross section along the extension direction of the inner and outer tubes.

12. A method for manufacturing an integrated structure of inner and outer tubes as described in claim 6, wherein the pressing plate has a U-shaped cross section along the extension direction of the inner and outer tubes, and the pair of through slits have a U-shaped cross section along the extension direction of the inner and outer tubes.

13. A method for manufacturing an integral structure of inner and outer pipes as described in claim 6, wherein the pair of pressing bodies are configured to intersect with each other, and the bending rigidity at the tip of the pressing body is set according to the material of the pressing plate, the length to the tip of each of the pair of pressing bodies, and the area of ​​each of the pressing surfaces, so that the first angle can be changed by manual force to deform each of the pair of pressing bodies and press them into the corresponding through slit.

14. A method for manufacturing an integrated structure of inner and outer pipes as described in any one of claims 1 to 6, further comprising a fastening screw portion having a male thread portion, and the outer pipe is formed with a female thread portion into which the male thread portion can be screwed.

15. In the case where an outer tube is fitted onto an inner tube so as to be movable relative to the inner tube in the longitudinal direction, a pressing plate having a load receiving surface that receives a load toward the inner tube and a pair of pressing bodies extending from the opposite surface of the load receiving surface toward the opposite surface of the load receiving surface, each of the pair of pressing bodies has a pressing surface at its tip that can come into contact with the outer circumferential surface of the inner tube, each of the outer tubes has a pair of through slits that penetrate in the thickness direction and through which one of the pair of pressing bodies can pass, the pair of pressing bodies are spaced apart from each other so that at least a part of each pressing surface is located within an opening formed on the outer circumferential surface of the outer tube of the corresponding through slit, and a first angle of each of the pair of pressing bodies with respect to the load receiving surface in the direction of extension of the corresponding through slit is set to be different from a second angle with respect to the outer circumferential surface of the inner tube in the direction of extension of the corresponding through slit so that each of the pair of pressing bodies can be pressed in by the inner circumferential surfaces of the corresponding through slits forming guide surfaces for each of the pair of pressing bodies, a bending rigidity at the tip of each of the pair of pressing bodies is set according to the material of the pressing plate, the length to the tip of each of the pair of pressing bodies, and the area of ​​each of the pressing surfaces so that the first angle can be changed by deforming each of the pair of pressing bodies by manual force, and thus the outer tube cannot move relative to the inner tube in the longitudinal direction of the tube when a load is applied, by the pressing surface abutting against the outer peripheral surface of the inner tube, and when the load is removed, the outer tube can move relative to the inner tube in the longitudinal direction of the tube, but the pair of pressing bodies are pressed and held in the pair of through slits by their elastic restoring force to their original shape.

16. A fixing and holding jig interposed between an inner tube and an outer tube which are fitted together to fix and hold the inner and outer tubes, the outer surface of the outer tube being provided with a pair of through slits spaced apart from each other, and at least one pressing portion penetrating the through slit from the outer peripheral surface of the outer tube and contacting the outer peripheral surface of the inner tube, the pressing portion having a pair of pressing bodies spaced apart from each other and capable of pressing against the outer peripheral surface of the inner tube by surface contact at two points, and a load receiving surface for pressing the pair of pressing bodies against the outer peripheral surface of the inner tube, each of the pair of pressing bodies having a pressing end surface capable of pressing against the outer peripheral surface of the inner tube, the pressing body of the pair of pressing bodies being closer to the end of the outer tube on the fitting side between the outer tube and the inner tube having an insertion hole in the thickness direction of the pressing body from the side of a pair of opposing sides constituting the pressing body that is closer to the end of the outer tube, a slotted hole with a circular cross section having a circular opening on the end face of the outer tube on the mating portion side and extending through to the side face closer to the end of the outer tube, the slotted hole further having an insertion rod that can be inserted into the slotted hole from the circular opening, and the pair of pressing bodies are inserted into the pair of through slits so that the slotted hole communicates with the insertion hole, and the pair of pressing bodies are held in the pair of through slits by inserting the tip of the insertion rod into the insertion hole.

17. A fixture for holding an inner and outer tube together as described in claim 16, wherein the slot has a female threaded portion, the insertion rod is a set screw that can be screwed into the female threaded portion of the slot, and the set screw is screwed into the slot while its tip is inserted into the insertion hole, thereby removably holding the pair of pressing bodies within the pair of through slits.

18. A fixture for holding an inner and outer tube together as described in claim 17, wherein the first elongated hole has an elliptical cross section elongated vertically in the direction of movement of the pressing body so that the pressing body can move within a predetermined range when the set screw is inserted into the insertion hole.

19. A fixture for fixing and holding an inner and outer tube together as described in claim 17 or claim 18, wherein the female threaded portion is provided in the elongated hole from near the side surface closer to the end of the outer tube to the side surface.

20. A fixing and holding jig interposed between an inner tube and an outer tube which fit together, for fixing and holding the inner and outer tubes, the outer surface of the outer tube being provided with a pair of through slits spaced apart from each other, and at least one pressing portion penetrating the through slit from the outer peripheral surface of the outer tube and contacting the outer peripheral surface of the inner tube, the pressing portion having a pair of pressing bodies spaced apart from each other and capable of pressing against the outer peripheral surface of the inner tube by surface contact at two points, and a load receiving surface for pressing the pair of pressing bodies against the outer peripheral surface of the inner tube, the pair of pressing bodies each having a pressing end surface capable of pressing against the outer peripheral surface of the inner tube, and further having a pressing lever having an annular peripheral surface which rotates around an axis parallel to the load receiving surface while in contact with the load receiving surface, the annular peripheral surface is curved such that the radius from the axis increases from a first radius to a second radius, and the pair of pressing bodies can move in the thickness direction of the slit within the corresponding through slit by rotating the pressing lever around an axis provided at a predetermined height from the outer peripheral surface of the outer tube, and by rotating the pressing lever around an axis provided at a predetermined height from the outer peripheral surface of the outer tube, the pressing body starts to press against the outer peripheral surface of the inner tube at a rotational position corresponding to an intermediate radius between the first radius and the second radius, and finishes pressing against the outer peripheral surface of the inner tube at a rotational position corresponding to the second radius, so that the pressing end face is brought into surface contact with the outer peripheral surface of the inner tube, and the outer peripheral surface of the inner tube opposite to the surface contact portion of the pressing end face with the inner tube is pressed and fixed against the inner peripheral surface of the outer tube.

21. A fixture for holding an inner and outer tube together as described in claim 20, wherein the pair of through slits are provided in a tubular base portion which is attached and fixed to the outer peripheral surface of one end of the outer tube, and the inner tube is fitted into the outer tube via the tubular base portion.

22. A fixture for fixing and holding an inner and outer tube together as described in claim 20 or claim 21, further comprising a pin standing upright from the outer peripheral surface of the outer tube or the tubular base portion, and a pivot fixed to the pin and extending parallel to the outer peripheral surface, wherein the pressing lever has a rotating part pivotally supported on the pivot and a gripping part extending from the outer edge of the rotating part, and the rotating part has the annular peripheral surface that abuts against the load-receiving surface.

23. A fixture for holding an inner and outer tube together as described in claim 22, wherein the rotating part is pivoted to the pivot so that when the pressing lever rotates to a position corresponding to the intermediate radius, the direction connecting the tip of the gripping part and the pivot is in an approximately upright position, and when the pressing lever rotates to a position corresponding to the second radius, the direction connecting the tip of the gripping part and the pivot is in a pressed-down position.

24. A fixture for fixing and holding an inner and outer tube together as described in claim 23, wherein the rotating portion has an annular peripheral surface that has the second radius over a predetermined central angle range relative to the pivot axis, depending on the desired pressing force applied by the pair of pressing bodies to the outer peripheral surface of the inner tube.

25. A fixture for holding inner and outer tubes together as described in claim 24, wherein the pin is screwed and fixed to the outer peripheral surface of the outer tube or the tubular base portion, and the height of the pivot can be adjusted by adjusting the amount of screwing.

26. A fixture for holding inner and outer tubes together and fixing them as described in claim 25, wherein the rotating part has a notch in a direction intersecting the pivot axis and is provided with a pair of rotating parts facing each other through the notch, the pin is arranged in the notch and has a first through hole through which the pivot axis can pass, each rotating part has a second through hole through which the pivot axis can pass rotatably, and the first through hole and the second through hole can be aligned and positioned so that the pivot axis can pass through.

27. A fixture for holding an inner and outer tube together as described in claim 20, wherein the annular peripheral surface is elliptical, the major axis of the ellipse constituting the second radius.

28. A music stand stand in which a music stand is fixedly supported by either an inner or outer tube, and which has a fixing support jig for the inner and outer tubes as described in any one of claims 1, 5, 6, 15, 16 and 20 at a fitting portion between the inner and outer tubes or between the inner tube and a tubular base portion which is fixedly attached to the outer peripheral surface of one end of the outer tube.

29. A table in which a table body is fixedly supported to either an inner or outer tube, and the inner or outer tube or the inner tube and a tubular base portion attached and fixed to the outer peripheral surface of one end of the outer tube form the legs of the table body, and the fitting portion of the inner and outer tubes has a fixing support jig for the inner and outer tubes as described in any one of claims 1, 5, 6, 15, 16 and 20.

30. A vehicle in which a saddle and / or a handlebar is fixedly supported on either the inner or outer tube, and which has a fixing support jig for the inner or outer tube as set forth in any one of claims 1, 5, 6, 15, 16, and 20 at a fitting portion between the inner or outer tube or between the inner tube and a tubular base portion fixedly attached to the outer peripheral surface of one end of the outer tube.

31. A frame for a temporary tent in which a three-dimensional framework is formed by fitting together multiple sets of inner and outer tubes, the frame for a temporary tent having a fixing support jig for the inner and outer tubes as described in any one of claims 1, 5, 6, 15, 16 and 20 at the fitting portion between the inner and outer tubes or between the inner tube and a tubular base portion attached and fixed to the outer peripheral surface of one end of the outer tube.

32. A spur having a U-shaped portion fixedly supported at the tip of either the inner or outer tube, and a fixing support jig for the inner and outer tubes as described in any one of claims 1, 5, 6, 15, 16, and 20 at a fitting portion between the inner and outer tubes or between the inner tube and a tubular base portion fixedly attached to the outer peripheral surface of one end of the outer tube.

33. A cart having casters on one of the inner and outer tubes that fit together and a loading platform on the other, and having a fixing support jig for the inner and outer tubes as described in any one of claims 1, 5, 6, 15, 16 and 20 at the fitting portion between the inner and outer tubes or between the inner tube and a tubular base portion that is attached and fixed to the outer peripheral surface of one end of the outer tube.

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