Manufacturing method of integral structure of inner and outer pipes, integral fixing / retaining jig of inner and outer pipes, and inclined angle adjustment jig

Abstract

To provide a manufacturing method of an integral structure of inner and outer pipes including a fixing / retaining jig which can achieve secure support only with hand force.SOLUTION: A manufacturing method of an integral structure of inner and outer pipes includes: a step in which a pair of penetration slit 18 and a female screw part 20 are processed at an outer tube 14 in fitting between a solid or hollow inner pipe and the hollow outer pipe 14; a step in which a fastening screw part including pressing parts which penetrate through the pair of penetration slits 18 from an outer surface, can be pressed against an outer peripheral surface of the inner pipe, and has a C shaped side cross section, and a torque providing grip which may threaded engage with the female screw part 20 is prepared, and a step in which a diameter of the torque providing grip is selected based on a support load and a worker fastens the fastening screw part by hand force to integrally fix the inner pipe and the outer pipe 14 to each other with respect to a longitudinal direction of the pipes while forming an inner pipe / outer pipe entire length adjustment jig, an inclined angle adjustment jig, or a fixing support fig for a stand which fixedly supports a heavy object with one of the inner pipe and the outer pipe.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[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. [Background technology]

[0002] Conventionally, inner and outer tube components whose overall length can be adjusted by adjusting the fitting length of the inner and outer tubes that fit together have been used for a variety of purposes, such as stands that support everyday items at a desired height, clothes drying poles, suction tubes for vacuum cleaners, and height adjustment of bicycle saddles. Such length-adjustable inner and outer tube components are usually adjusted manually to adjust the length of the stand, the length of the pole depending on the number of laundry loads, or the height of the saddle by adjusting the fitting length of the inner tube relative to the outer tube. More specifically, the outer peripheral surface of one end of the inner tube is fitted onto the inner peripheral surface of one end opening of the outer tube, and after adjusting the fitting length appropriately, a fastening screw having a male threaded portion that screws into the female threaded portion of a circular through hole provided on the outer peripheral surface of the outer tube is rotated so that the tip of the male threaded portion comes into contact with the outer peripheral surface of one end of the inner tube, which is tightened and fixed, thereby 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 adjusting jigs for the inner and outer tubular members have the following technical problems. First, even if it is possible to adjust the length of the inner and outer tubular members, the adjusted length of the inner and outer tubular members is not maintained sufficiently. More specifically, since the fastening screw is screwed into the female threaded portion of the outer tube by rotating the male thread around the longitudinal direction, even if the tip of the fastening screw portion is shaped to follow the curved shape of the outer peripheral surface of the inner tube, depending on the rotational position of the tip when it hits the outer peripheral surface of the inner tube, the tip of the fastening screw portion and the outer peripheral surface of the inner tube may just happen to come into surface contact. When the inner and outer tubes have a curved outer surface, such as a circular cross section, there is point or line contact between the tip of the fastening screw and the outer surface of the inner tube, which results in insufficient fixation of the inner tube to the outer tube and makes it difficult to maintain the length of the inner and outer tube components.

[0004] Secondly, when used as a stand to support a heavy object, the fastening force tends to be insufficient, which can cause the interlocking lock to suddenly come loose, causing the heavy object to fall. More specifically, the weight of the heavy object is supported by the frictional force between the tip of the male threaded portion of the fastening screw portion and the outer surface of the inner tube at the mating position, and the resistance force of the tip of the male threaded portion against the outer surface of the inner tube, which constitutes part of the frictional force, can decrease over time due to loosening of the screw, etc. However, in order to cover up insufficient fixing and holding, for example, when supporting a heavy object such as a stand, tightening multiple fastening screws individually takes time and effort, is inconvenient and impractical, and when trying to ensure tightening and fixing force, the tip of the male thread portion may leave a mark or dent on the outer surface of one end of the inner tube, which may cause deterioration from functional and aesthetic standpoints. In particular, in the case of inner and outer pipes made of resin, the clamping force is too strong, which can cause cracks or breakage on the outer surface of the inner pipe.

[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, and the pipes, particularly the outer pipe, are thick, 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 tubes can be adjusted by screwing the fastening screw into the outer tube from the outer surface side of the outer tube and fixing the tip to the outer peripheral surface of the inner tube, this can only be said to be useful for very limited applications, including the practicality of adjusting the fitting length of the inner and outer tubes itself.

[0006] In this regard, a length adjustment jig for inner and outer pipe members is known which adjusts the length of the outer and inner pipe members by providing a pair of protruding flanges on the outer pipe that face each other in the longitudinal direction of the pipe, and tightening the threaded portions against the female threaded portions provided on each protruding flange to narrow the clearance between the pair of protruding flanges, thereby pressing the inner surface of the outer pipe against the outer surface of the inner pipe. With this type of length adjustment jig for inner and outer tube components, the inner surface of the outer tube is pressed against the outer surface of the inner tube without the tip of the threaded portion coming into contact with the outer surface of the inner tube, but it is difficult to obtain sufficient tightening force from the threaded portion. More specifically, the threaded portion has a head portion and a male thread portion extending from the head portion, and tightening force is applied by turning the head portion with fingers, but because the head portion is located near the outer surface of the outer tube, it is difficult to expand the diameter, and it is necessary to pinch it with your fingers and turn it rather than gripping it with your hand, making it difficult to apply force.By providing a long shank portion to the threaded portion, it is possible to expand the diameter of the head portion away from the outer surface of the outer tube, but this is not aesthetically pleasing and is not desirable from a design perspective.

[0007] Furthermore, a length adjustment jig for inner and outer tube members is known that is similar to the above in that a screw having a male thread is screwed into the female thread of the outer tube to adjust the length of the inner and outer tube members, but in which a protrusion that protrudes outward is provided on the outer tube, a spacer is placed in the internal space formed by the protrusion, and the outer tube is fixed to the outer surface of the inner tube via the spacer by the tightening force of the screw. With this type of length adjustment jig for inner and outer pipe members, the tip of the threaded portion does not come into direct contact with the outer surface of the inner pipe, but the inner surface of the outer pipe is indirectly pressed against the outer surface of the inner pipe. However, as described above, the provision of a protrusion that protrudes outward on the outer pipe cannot be achieved by lathe processing, 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. DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[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, which is equipped with a fixing support jig that can be firmly supported by hand alone, and a fixing and holding jig for fixing and holding the inner and outer pipes together.

[0010] 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 can be easily operated to adjust the overall length of the inner and outer tubes.

[0011] 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 height position of a heavy object to be adjusted by adjusting the overall length of the inner and outer tubes when supporting the heavy object at a predetermined height through the fitting structure of the inner and outer tubes.

[0012] 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. [Means for solving the problem]

[0013] In order to achieve the above object, the method for manufacturing an integral structure of an inner and outer pipe of the present invention comprises the steps of: A step of machining, 3D printer modeling, or lost wax processing a pair of through slits and a female screw portion on an outer surface corresponding to a fitting portion of a solid or hollow inner tube and a hollow outer tube that fit together; a pressing portion having a U-shaped cross section, which 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, and which has a clearance hole; and a pressing portion which can be screwed into the female screw portion. Male thread and a tightening screw portion having 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 support load so that the tightening screw portion can be firmly supported by hand force alone; At a predetermined fitting position, the tightening screw portion is manually tightened via a torque application grip, and the male screw portion is screwed into the female screw portion through the clearance hole, whereby the pressing portion is pressed and fixed in a manner of surface contact with the outer peripheral surface of the inner pipe toward the outer peripheral surface of the inner pipe, and the outer peripheral surface of the inner pipe on the opposite side of the surface contact portion of the pressing portion with respect to the inner pipe is pressed and fixed in a manner of surface contact with the inner peripheral surface of the outer pipe. directly The structure includes a step in which the inner and outer tubes are fixed together in the longitudinal direction of the tubes to form an overall length adjustment jig for the inner and outer tubes by pressing and fixing them together, or an inclination angle adjustment jig that connects the inner and outer tubes rotatably via a pivot and adjusts the fitting position of the inner and outer tubes, or a fixed support jig for a stand that supports and fixes heavy objects using either the inner or outer tubes.

[0014] Furthermore, it is preferable that the clamping screw portion has a male thread portion, and the outer tube has a female thread portion into which the male thread portion can be screwed.

[0015] In order to achieve the above object, the fixing and holding jig for inner and outer tubes of the present invention comprises: A fixing and holding jig that is interposed between an inner tube and an outer tube that are fitted together and that fixes and holds the inner and outer tubes, The outer surface of the outer tube is provided with a pair of spaced-apart through slits, at least one pressing portion that passes through the through slit from the outer peripheral surface of the outer tube and contacts the outer peripheral surface of the inner tube, the pressing portion has 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, the pair of pressing bodies each have a pressing end surface that can be pressed against the outer circumferential surface of the inner tube, The load bearing member further includes a pressing lever having an annular peripheral surface that rotates around an axis parallel to the load bearing surface while contacting the load bearing surface, the annular 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 corresponding through slits by rotating the pressing lever; By rotating the pressing lever about an axis provided at a predetermined height from the outer circumferential surface of the outer tube, the pressing body moves toward the outer circumferential surface of the inner tube at a rotation position corresponding to an intermediate radius between the first radius and the second radius. directly When the pressing starts, the pressing body moves toward the outer circumferential surface of the inner pipe at a rotation position corresponding to the second radius. directly After the pressing is completed, the pressing end surface is brought into surface contact with the outer peripheral surface of the inner pipe, and the outer peripheral surface of the inner pipe on the opposite side of the surface contact portion of the pressing end surface with the inner pipe is brought into surface contact with the inner peripheral surface of the outer pipe. directly It is configured to be pressed and fixed.

[0016] Preferably, the pair of through slits are provided in a tubular base portion that is attached and fixed to the outer peripheral surface of one end of the outer tube, and the inner tube is fitted to the outer tube via the tubular base portion.

[0017] Furthermore, it is preferable that the device further has 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 part that is rotatably supported on the pivot and a grip part that extends from the outer edge of the rotating part, and the rotating part has the annular peripheral surface that abuts against the load-receiving surface.

[0018] In addition, it is preferable that the rotating part is 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.

[0019] Furthermore, it is preferable that 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.

[0020] Furthermore, 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.

[0021] Furthermore, it is preferable that the annular peripheral surface is elliptical, and the major axis of the ellipse constitutes the second radius.

[0022] In addition, the music stand may be a stand in which the music stand is fixedly supported by either the inner or outer tube, and the fixing support jig for the inner or outer tube described in claim 1 or claim 3 is provided 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.

[0023] The table may also be one in which the table body is fixedly supported to 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 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 described in claim 1 or claim 3.

[0024] Furthermore, the vehicle may have a saddle and / or handlebars fixedly supported on either the inner or outer tube, and have a fixing support jig for the inner or outer tube as described in claim 1 or claim 3 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.

[0025] Furthermore, in a frame for a temporary tent in which a three-dimensional framework is formed by fitting multiple sets of inner and outer tubes together, the frame may have a fixing support jig for the inner and outer tubes described in claim 1 or claim 3 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 surface of one end of the outer tube.

[0026] In addition, the U-shaped portion may be fixed and supported at the tip of either the inner or outer tube, and the fixing and supporting jig for the inner and outer tubes described in claim 1 or claim 3 may be provided 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 peripheral surface of one end of the outer tube. Alternatively, 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 have a fixing support jig for the inner and outer tubes described in claim 1 or claim 3 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. BEST MODE FOR CARRYING OUT THE INVENTION

[0027] A first embodiment of the length adjusting 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 interposed between the inner tube 12 and outer tube 14 that fit together, and is generally composed of a pressing body 22 that has a pressing surface 54 that can be pressed 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. 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 explained later, the fitting length between the inner tube 12 and the outer tube 14 can be 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 surface 17 of the outer tube 14 from one end opening into one end opening of the outer surface 15 of the inner tube 12. When the outer tube 14 is fitted into the inner tube 12, a slight clearance may be provided between the inner peripheral surface 17 of the outer tube 14 and the outer peripheral surface 15 of the inner tube 12, as long as the outer tube 14 is fixedly held in the longitudinal direction relative to the inner tube 12 by the fastening screw portion 24 via the pressing body 22, as will be described later. The slight clearance is, for example, 0.05 mm to 0.1 mm. A pair of through slits 18 are provided on the outer surface 16 of the outer tube 14, spaced apart by a distance D, and a female screw portion 20 is provided between the pair of through slits 18. The distance D between the pair of through slits 18 can be selected according to the application of the length adjustment jig 10, as will be described later.

[0029] The pair of through slits 18 are provided so as to extend in the longitudinal direction of the inner and outer tubes 12, 14 at a predetermined interval from each other in the longitudinal direction of the inner and outer tubes 12, 14, respectively. 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 penetrate in the thickness direction. As will be explained later, since the pressing body is fastened and fixed to the outer tube 14 via the fastening screw portion 24, there is no need for the pressing portion 22 to penetrate in a tight fit manner into the pair of through slits 18 provided on the outer surface 16 of the outer tube 14.

[0030] The pressing portion 22 is positioned on the outer peripheral surface 16 of the outer tube 14 and passes through the pair of through slits 18 so as to come into contact with 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 an approximately U-shaped cross section, which has a clearance hole portion 32 that penetrates in the thickness direction and two pressing portions 22 that extend in opposite directions from the clearance hole portion 32. The pressing body 34 has a central portion 48 where the clearance hole 32 is provided, and each of the pair of pressing portions 22 has an inclined portion 56 extending downward from the entire corresponding end of the central portion 48. Each of the pair of pressing portions 22 extends from the entire lower end of the inclined portion 56 and has a pressing surface 54 on its lower surface 38. The pressing surfaces 54, which are the tip surfaces of the pressing portions 22, are shaped to conform to 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 a cylindrical outer surface, 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. Therefore, the pressing surface 54 can be pressed against the outer peripheral surface 15 of the inner pipe 12 with the arc-shaped cross section aligned with 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. 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 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 threaded portion 26 passes through the clearance hole portion 32 and is tightened against the female threaded portion 20, thereby making it possible to fix the outer tube 14 to the inner tube 12 via the pressing portion 22.

[0032] A contact surface 46 that can come into contact with the outer peripheral surface 16 of the outer tube 14 is provided on the back surface of the central portion 48 of the pressing body 34 . More specifically, a flat abutment surface 46 is provided around the lower end opening of the clearance hole portion 32, and the male thread portion 26 is screwed into the female thread portion 20 on the outer peripheral surface 16 of the outer tube 14 using the fastening screw portion 24 until the lower surface of the shank portion 36 abuts against the annular surface of the pressing body 34, so that the abutment surface 46 abuts against the outer peripheral surface 16 of the outer tube 14 and the pressing surface 54 is fastened and fixed to the outer peripheral surface 15 of the inner tube 12. As a result, the inner and outer tubes 12, 14 are fixed and held at a predetermined fitting length via the fastening screw portion 24 and the pressing body 34.

[0033] The tightening 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 the tightening screw portion 24 has a shank portion 36 and a male thread portion 26 extending downward from the lower surface 38 of the shank portion 36, the male thread portion 26 being able to be threaded into the female thread portion 20, and an annular surface 40 surrounding the male thread portion 26 is formed on the lower surface 38. After adjusting the fitting position of the inner tube 12 relative to the outer tube 14, the male threaded portion 26 is screwed into the female threaded portion 20 using the tightening screw portion 24, while the pressing portion 22 is passed through a pair of through slits 18 and pressed and fixed 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 side that can be gripped with fingers and rotated. 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 standpoint of preventing slippage, it may be provided with multiple 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.The inner tube 12 is then 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 portion 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.In order to do this, 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 pipes 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 pipes 12, 14 than when they are spaced apart in the circumferential direction of the inner and outer pipes 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 pipe 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] Regarding the use of the length adjustment jig 10, the pair of through slits 18 are arranged at a predetermined interval from each other in the longitudinal direction of the inner and outer tubes 12, 14, and extend circumferentially of the inner and outer tubes 12, 14, respectively, and the inner and outer tubes 12, 14 are oriented vertically, and either the inner or outer tube 12, 14 supports a heavy object at a predetermined height. In particular, when using the length adjustment jig 10 to adjust the fitting length of the inner and outer tubes 12, 14 extending in the vertical direction to fix and hold a heavy object at a predetermined height, from the viewpoint of supporting the weight of the heavy object by the frictional force between the pressing surface of the pressing 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 by the fastening screw portion 24, and for this reason, the pressing portion 22, fastening screw portion 24, and inner and outer tubes 12, 14 that make up 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] As a variant, the length adjustment jig 10 may be made of resin from the viewpoint of lightness, and in particular, even if a pair of slit portions and an opening for the female screw portion 20 are provided, it is preferable to ensure a certain thickness from the viewpoint of ensuring strength around them. In this case, the pair of through slits 18 are preferably provided so as to extend in the circumferential direction of the inner and outer pipes 12, 14 at a predetermined interval from each other in the circumferential direction of the inner and outer pipes 12, 14, respectively. The length adjusting jig 10 is used, for example, in a clothesline pole for adjusting the overall length of the inner and outer tubes 12, 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, 14 can be adjusted according to the number of laundry to be dried by adjusting the fitting length of the inner and outer tubes 12, 14 with the length adjusting 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 loads 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.

[0038] 33 and 34, in a further modified example, 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 fixing and supporting the inner and outer tubes 12, 14 that are fitted together, at the fitting position of the inner and outer tubes 12, 14, each of the pair of pressing bodies 34 of the U-shaped cross-section pressing portion 22 is passed through the corresponding through slits 18 of the outer tube 14, and then the male thread portion 26 of the fastening screw 24 is passed through the clearance hole 32 of the pressing portion 22 and screwed into the female thread portion 20 provided on the surface of the outer tube 14.As a result, each of the pair of pressing surfaces 54 of the pressing portion 22 that are spaced apart in the longitudinal direction of the inner and outer tubes 12, 14 is shaped to follow 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 thread 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 tightening screw 24 is inserted into one of the multiple holes 128. For example, when using crutches, if the user adjusts the length of the cane so that the top of the cane rests against the armpit and holds the cane in the hand to support their weight, the crutches are required to have a weight-bearing function in addition to a length-adjustment function.In particular, if the weight-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 that the crutches have a complete weight-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.Therefore, 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 then the male thread portion 26 of the fastening screw 24 is passed through the clear hole 32 of the pressing portion 22 and screwed into the female thread 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 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 thread 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 length of the inner and outer tubes 12, 14, and then the inner and outer tubes 12, 14 are 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. Therefore, when a load that would cause relative rotation around 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 determined by cutting the outer circumferential surface 16 of the outer tube 14 .

[0040] According to the length adjusting jig having the above-mentioned configuration, the inner and outer tubes 12, 14 are fitted together by 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 surface 16 of the outer tube 14 and contacts the outer surface 15 of the inner tube 12, and the fastening screw portion 24 that can press and fix the pressing portion 22 against the outer surface 15 of the inner tube 12. When adjusting the length of the fitting portion of the inner and outer tubes 12, 14 that are fitted together, the tip surface of the pressing portion 22 is shaped to fit along the outer surface 15 of the inner tube 12 so that it can come into surface contact with the outer surface 15 of the inner tube 12. After adjusting the fitting position of the inner tube 12 relative to the outer tube 14, the tightening 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 space to accommodate the pressing portion, which has an opening facing the inner surface 17 of the outer tube 14 and protrudes outside the outer tube 14.By screwing in the tightening screw portion, the pressing portion 22 within a predetermined range from the female thread portion 20 passes through the through slit 18, and the tip surface can be pressed and fixed in place against the outer surface 15 of the inner tube 12 in a surface contact manner.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 tightening force. It has been described that the inner and outer tubes 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 tube 12 so that it adheres closely to the outer surface of the inner tube 12, and that if the diameters of the inner and outer tubes 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 tubes 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 tube 12, and this can be used for inner and outer tubes 12, 14 having various rectangular cross sections.

[0041] The following describes a method for adjusting the lengths of the inner and outer tubes 12 and 14, particularly in the case of existing inner and outer tubes 12 and 14 that fit together: A step of drilling a pair of spaced-apart through slits 18 and a female screw portion 20 between the pair of through slits 18 on an outer peripheral surface 16 at one end of the outer tube 14; a step of preparing a pressing portion 22 positioned on the outer peripheral surface 16 of the outer tube 14, passing through a pair of through slits 18 and contacting the outer peripheral surface 15 of the inner tube 12, and a fastening screw portion 24 having a male screw portion 26 that can be screwed into the female screw portion 20 and that can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12; After adjusting the fitting position of the inner tube 12 relative to the outer tube 14, the male threaded portion 26 is screwed 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 tube 12. According to the above method, by drilling a hole in one end of the outer tube 14 in the existing inner and outer tubes 12, 14, it is possible to universally adjust the overall length of the inner tube 12 and the outer tube 14 for the existing fitting structure between the inner tube 12 and the outer tube 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 given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 8 to 10. The second embodiment of the present invention is characterized by a tubular base portion 30 provided on the outer tube 14, which 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 toward 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 similar 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 a 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 and a female thread portion 20 provided between the pair of through slits 18 are provided on the outer peripheral surface 16 of the tubular base portion 30.

[0043] More specifically, the tubular base portion 30 is a hollow cylinder whose one end 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 between it and the outer peripheral surface 16 of the tubular base portion 30. According to 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 screwed 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 and pressed and fixed against the outer peripheral surface 15 of the inner tube 12. The tubular base portion 30 may be attached and fixed to one end of the outer tube 14 by, for example, screws or by 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 having 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. 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 screw portion 26 that can be threaded into the female screw 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 screw portion 20 between them, in this embodiment a tubular protrusion 65 is provided at a position corresponding to the female screw portion 20, facing outward 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, and has a female thread 20 formed therein so as to align with the female thread 20, so that the male thread 26 of the fastening screw portion 24 can be threadably engaged with it. The tubular protrusion 65 may be fixed to the outer peripheral surface 16 separately from the outer tube 14, for example, by welding. The outer shape of the tubular protrusion 65 does not need to be cylindrical, and may be any shape 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 thickness of the outer tube 14 is thin and the screw-in length of the male thread portion 26 cannot be sufficiently ensured, and the predetermined height h may be determined from this perspective. As in the first embodiment, the length of the male thread portion 26 is set so that the tip of the male thread portion 26 does not come into contact with the outer peripheral surface 15 of the inner tube 12 when the pressing portion 22 is pressed against and fixed to the outer peripheral surface 15 of the inner tube 12. Conversely, as a modified example, when the outer tube 14 is thick, 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 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 grinding depth of the outer surface 16, may 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 fastening 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 Figures 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 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 toward the outer peripheral surface 15 of the inner tube 12, which is similar to the first embodiment. However, 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. However, 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 through 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, at the position of the female thread portion 20 on the outer peripheral surface 16 of the outer tube 14, a male thread portion 74 is provided orthogonally facing outward relative 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 pressing body 34 itself is maintained in a state inserted into the male thread portion 74 via the clearance hole 32. Therefore, it is possible to prevent the pressing body 34 itself from suddenly coming off 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 in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to FIG. The fifth embodiment of the present invention is characterized by a coil spring 76 provided between the outer 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 outer tube 14 that are fitted together, and has a pressing portion 22 that passes through a pair of through slits 18 and contacts the outer 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 surface 15 of the inner tube 12. The tightening screw portion 24 is the same as the first embodiment in that it has a male screw portion 26 that can be threaded into the female screw portion 20, but the first embodiment does not have such a coil spring 76. More specifically, a coil spring 76 having a diameter larger than that of the female screw portion 20 is provided, which can be inserted into the male screw portion 26 of the tightening screw portion 24 through the clearance hole 32 of the pressing portion 22, and the number of turns of the coil can be set appropriately according to the U-shaped height of the pressing portion 22. According to this embodiment, when the male threaded portion 26 of the tightening screw portion 24 is screwed into the female threaded portion 20, the pressing portion 22 is supported on the upper surface of the coil spring 76, so that the pressing end face 54 protrudes from the corresponding through slit 18 toward the outer peripheral surface 15 of the inner tube 12, making it possible to prevent the inner tube 12 from getting in the way when moving the inner tube 12 relative to the outer tube 14 in the direction of extension of the tubes in order to adjust 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 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, this makes it 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 in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 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 sixth embodiment of the present invention is a length adjustment jig 10 interposed between the inner tube 12 and the outer tube 14, which are fitted together, and has a pressing portion 22 that passes through a pair of through slits 18 and contacts 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. The tightening screw portion 24 is the same as the first embodiment in that it has a male screw portion 26 that can be screwed into the female screw portion 20, but the first embodiment does not have 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 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 formed on the inner 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 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 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 surface 15 of the inner tube 12, making it possible to prevent the outer surface 15 of the inner tube 12 from being scratched or dented. Furthermore, by making the protective plate 78 out of rubber with a high coefficient of friction, it is possible to ensure a frictional force between the protective plate 78 and the outer surface 15 of the inner tube 12, thereby further strengthening the fixed support between the inner tube 12 and the outer tube 14. Note that Figure 17 shows a modified example in which a pair of protective plates 82 are provided, and each protective plate 82 is arranged so that it can be 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 tube 12, each protective plate 82 is also crushed, preventing the outer peripheral surface 15 of the inner tube 12 from being scratched or dented, and ensuring friction between the protective plates 82 and the outer peripheral surface 15 of the inner tube 12. However, the shallow groove 80 provided on the inner peripheral surface of the outer tube 14 can be omitted.

[0048] The seventh embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are designated by similar reference numerals and description thereof will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to FIG. The seventh embodiment of the present invention is characterized by the direction of the pair of through slits 18 and the female screw portion 20 between the pair of through slits 18. The length adjusting 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 comes into contact with the outer circumferential 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 circumferential 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 screw portion 20, which is common to the first embodiment. However, in the first embodiment, the direction of the pair of through slits 18 and the female screw 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 direction of the pair of through slits 18 and the female screw 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 direction 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 should be 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 given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to FIG. The eighth embodiment of the present invention is characterized by the pressing body 34 provided on the outer tube 14. This 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 through slit 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. This is similar to the first embodiment in that the tightening screw portion 24 has a male screw portion 26 that can be threaded into the female screw 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 clearance 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 presser 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 to screw the male thread portion 26 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 presser body 34, as in the first embodiment, and the presser body 34 can be pressed toward the outer peripheral surface 15 of the inner tube 12. Also as in the first embodiment, the presser surface 54 of the presser 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. Compared to the first embodiment, this embodiment is more suitable for use in adjusting the overall length of the inner and outer tubes 12, 14, such as a clothesline pole, than for applying the length adjustment jig 10 to the inner and outer tubes 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 in the first embodiment will be denoted by the same reference numerals and will not be described again. The following describes in detail the characteristic features of this embodiment with reference to FIG. The ninth embodiment of the present invention is characterized in that the length adjusting jig 10 is used as a so-called earthquake prevention brace. More specifically, to prevent furniture, such as a shelf, from tipping over during an earthquake, the length adjustment jig has 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, and 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 an 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 perpendicularly intersecting walls, and a receiving part 88 that can receive a lower end surface 96. With this configuration, the fitting position 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 length of the inner pipe 12 and the outer pipe 14 can then be adjusted. Then, the inner circumferential surface of the outer pipe 14 can be firmly fixed and supported to the outer circumferential surface of the inner pipe 12 via the pressing part 22 using the tightening screw part 24. For example, by installing 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 are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 24 to 26. The tenth embodiment of the present invention is characterized in that it is applied as an inclination angle adjusting jig to support a solar panel and adjust the inclination 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 its lower end 103 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 comes into contact with 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 threads the male thread portion 26 into the female thread 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, thereby making it possible to adjust the inclination angle of the second support bar 112 relative to the ground 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 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 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 108 is provided to pass 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 the rectangular plate-shaped heavy load W is supported at four points by the lower ends 103 of the first support bars 104 and the 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 on 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 screw 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 loosening and then retightening the torque-applying grip provided on only one side by hand, 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 loosening and fastening.

[0055] An eleventh embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 27 and 28. The feature of the eleventh embodiment of the present invention is that, while in the above-mentioned embodiments, the fitting position of the inner and outer tubes 14 could be adjusted to use only to adjust the length of the inner and outer tubes 14, or the fitting position of the inner and outer tubes 14 could be adjusted to use only as a stand while supporting a heavy object with either the inner or outer tube 14, or the inclination angle θ of the rectangular surface of the rectangular heavy object could be adjusted while supporting a rectangular heavy object with either the inner or outer tube 14, in this embodiment, the inclination angle θ, lateral position, and height of the traffic sign can all be adjusted in order to be applied to traffic signs.

[0056] More specifically, the device has 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, and the height of the inner and outer tubes 12, 14 can be adjusted, and the lateral position can be adjusted by adjusting the position of the diagonal tube 126 relative to the tubular section 102, and the inclination angle θ of the traffic sign T relative to the upper end of the diagonal tube 126 can be adjusted.The present invention is applied to a fixing 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 inclination angle by adjusting the fitting position of the inner tube 12 and the outer tube 14, which rotatably connects the inner tube 12 and the outer tube 14 via a pivot 108. The configuration of each adjustment jig is the same as that of the above-described embodiment, and therefore a 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, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 19, 36 and 37. The feature of the twelfth embodiment of the present invention is that, while in the above-mentioned embodiments, the fitting position of the inner and outer tubes 14 could be adjusted to adjust only the length of the inner and outer tubes 14, or the fitting position of the inner and outer tubes 14 could be adjusted to use only as a stand while supporting a heavy object with either the inner or outer tube 14, or the inclination angle θ of the rectangular surface of the rectangular heavy object could be adjusted while supporting a rectangular heavy object with either the inner or outer tube 14, in this embodiment, the inclination angle θ, lateral position, and height of the traffic sign can all be adjusted in order to be applied to traffic signs. 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, diagonally upwards, and the lower parts of the outer tubes 14 of the pair of inner and outer tubes 12, 14 are 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, and the steelpan (musical instrument) is supported at four points. In this case, the fitting lengths of the pair of inner and outer tubes 12, 14 are adjusted to be the same using a length adjustment jig, so that the steelpan (musical instrument) can 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. To support the steelpan at a predetermined height, the fixing support jig of the present invention is utilized for the mating portions of the inner and outer tubes 12, 14. When folding 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 upward along the outer tube 14. This allows for a compact, foldable stand for transporting a large, heavy object such as a steelpan. It is convenient for transporting in a car, for example, and can be carried 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, and a detailed description thereof will be omitted. As a variant, when used as a microphone stand, as shown in Figure 20, the entire outer tube fits onto the outer surface of a diagonal bar that fixes the microphone to one end and adjusts its height, and by using a length adjustment jig 10 at this fitting position, it is possible to easily adjust not only the height of the microphone but also its horizontal position.

[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. However, all of these jigs 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. The manufacturing method of the integral structure of the inner and outer tubes 12, 14 is as follows: A step of machining, 3D printer modeling, or lost wax processing a pair of through slits 18 and a female screw portion 72 on an outer surface of a solid or hollow inner tube 12 and a hollow outer tube 14 that fit together, the outer surface corresponding to the fitting portion of the outer tube 14; 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 screwed 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 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 pressing and fixing the outer peripheral 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 peripheral surface of the outer tube 14, thereby forming an overall length adjustment jig for the inner and outer tubes 12, 14, or an inclination angle adjustment jig that rotatably connects the inner tube 12 and outer tube 14 via the pivot 108 and adjusts the fitting position of the inner tube 12 and outer tube 14, or a fixing support jig for a stand that supports and fixes a heavy object with either the inner or outer tube 12, 14, and then fixing the inner tube 12 and outer tube 14 together in the longitudinal direction of the tubes to complete the process. 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 methods are broadly classified as follows: If the material is metal, solid materials can be machined using methods such as pressing, cutting, and drilling, while molten materials can be cast or modeled using a 3D printer. If the material is resin, solid materials can be machined, while molten materials can be molded using methods such as injection molding and blow molding, or modeled using a 3D printer. In particular, when casting metal, the lost wax method or full mold method is preferred, and when molding metal using a 3D printer, 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 called fused deposition modeling. Specifically, the manufacturing method includes the steps of melting a resin composition or filament and extruding the resulting melt from the nozzle of a 3D printed object manufacturing device to create the 3D printed object. The melting step involves melting a 3D printing material, which is a propylene resin composition for 3D printers or a filament for 3D printers. The heating means for melting the 3D printing material is not particularly limited, and any known heating means can be used. For the melting step, it is preferable to use a 3D printing object manufacturing device equipped with a heating means such as an electric heater. The temperature at which the 3D printing material is melted is not particularly limited and may be set appropriately depending on the properties of the thermoplastic resin. For example, the temperature at which the 3D printing material is melted may be a temperature of +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 create a 3D printed object. For example, in the modeling process, the molten 3D printing material is extruded from the nozzle of a 3D printing object manufacturing device, and a 3D printed object can be created by sequentially stacking 2D layers on a substrate based on multiple 2D data. The multiple 2D data are generated by slicer software, which slices the 3D coordinate data of the 3D printed object to be created. The 3D printed object manufacturing device may be a material extrusion type 3D printed object manufacturing device. There are no particular limitations on the material extrusion type 3D printed object manufacturing device, and any known device or known device configuration may be used. The 3D printed object manufacturing device may be, for example, a device including a cylinder, a nozzle, and a heating means. The 3D printed object manufacturing device is supplied with a 3D printed object material. The nozzle is provided downstream of the cylinder in the direction of extrusion of the 3D printed object material. The nozzle extrudes the 3D printed object material. The heating means is provided on the cylinder. The heating means heats and melts the 3D printed object material. The 3D printing object manufacturing device extrudes the heated and melted 3D printing material from a nozzle and performs additive manufacturing of the 3D printing material extruded from the nozzle. This results in the creation of a 3D printed object. Alternatively, the 3D printing material may be solidified by irradiating it with ultraviolet light using a conventional stereolithography method.

[0062] The cylinder may have a screw therein, which mixes the 3D printing material. The 3D-printed object manufacturing apparatus may further include a table device disposed opposite the nozzle, on which the molten 3D-printing material extruded from the nozzle is deposited. The 3D-printed object manufacturing apparatus may further include a control means for controlling 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-, Y-, and Z-axis directions relative to a reference plane. Alternatively, a photolithography method may be used in which molten 3D printing material is solidified using ultraviolet light.

[0063] On the other hand, the lost wax process can be broadly classified into two types of casting methods: methods in which the pattern used to create the mold is removed from the mold by dissolving or burning it off, and the space between the pattern 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 methods in which the pattern itself is not burned off, but is instead 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 process).

[0064] The lost wax method uses wax as the pattern material, and after laminating and hardening a slurry mold material onto a pattern formed using a mold, etc., the wax is dewaxed (heated and dissolved, burned off), and the space where the original pattern was is filled with molten metal to create a casting.The full mold method uses a resin material such as polystyrene foam as the pattern material, and a pattern created by mold forming or direct processing is buried in the mold material, and molten metal is poured in as it is, and the pattern disappears 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 perspective 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 especially the inner pipe 12, are made of resin, it is preferable to ensure the area of the elongated rectangle from the perspective of protecting the outer surface 15 of the inner pipe 12. The surface shape is preferably a shape that follows the outer surface 15 of the inner pipe 12 so as to be able to abut closely against the outer 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 integral structure of inner and outer pipes having the above-mentioned configuration, when preparing the inner and outer pipes that fit together, the pressing portion 22 having the clearance hole 32, and the fastening screw portion having the female screw portion that can be screwed into the female screw portion and the torque application grip 132, the diameter of the torque application grip 132 is selected according to the support load that is determined depending on the application of the integral 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 inward toward the outer circumferential 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 method for manufacturing 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 uses.

[0067] The thirteenth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 38 to 40. The feature of the thirteenth embodiment of the present invention is that, while in the above-described embodiments, there is a case where the fastening screw 24 is loosened too much and the pressing portion 22 comes completely out of the corresponding through slit 18, in this embodiment, such a situation is prevented from occurring.

[0068] More specifically, when loosening the fixed support provided by the fastening screw 24 at the mating portion of the inner and outer tubes 12, 14, it is necessary to reverse the fastening screw 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 screw 24 is loosened too much, the pressing portion 22 may come completely out of the corresponding through slit 18, causing the pressing portion to fall off the inner and outer tubes 12, 14, and in some cases, the pressing portion 22, which is a small part, 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 by, for example, screwing. 38 to 40 , the cross section of the pressing body 34 along the pressing surface 54 from the top surface 44 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 1°.

[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] Next, as shown in Figure 40, the pressing surfaces 54 of each inclined portion 56 come into contact with the outer peripheral surface 15 of the inner tube 12, and by further tightening the fastening screw portion 24, the pressing body 34 fixes and holds the outer tube 14 relative to the inner tube 12 in the longitudinal direction of the tube. More specifically, by threading the male thread portion 26 of the tightening screw portion 24 into the female thread portion 24 of the outer tube 14, the pressing end face 54 is pressed against the outer peripheral surface 15 of the inner tube 12 through the through slit 18 of the outer tube 14, and the inner tube 12 is moved until the diametrically opposite part of the outer peripheral surface 15 of the inner tube 12 contacts the inner peripheral surface of the outer tube 14.In this way, the inner tube 12 is firmly fixed and supported to the outer tube 14 by support at three points: two pressing end faces 54 and one line contact extending in the longitudinal direction of the tube. 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 pipe 12 . The predetermined value, which is the difference between the intervals L2 and L1, can be determined from the perspective of being able to press-fit while deforming each inclined portion 56 so that the first angle θ2 becomes small within the range in which the tightening screw portion 24 is tightened by hand, and while using the inclined inner surface 150 of the corresponding through slit 18 as a guide surface.To this end, 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, it is sufficient to ensure the thickness T1 of the inclined portion 56. If the Young's modulus of the material of the pressing body 34 is large, it is also possible to set the length l from the upper surface 44 of the pressing portion 34 to the pressing surface 54 to be long, or to set the thickness T1 of the inclined portion 56 to be small. The V-shaped configuration of the pressing body 34 and the through slit 18 may be curved rather than diagonally linear, as long as the pressing body 34 can be pressed into the through slit 18, and in this case, the inclined outer surface 152 opposite the press-fit surface may be a free-form surface, as long as clearance can be secured while the pressing body 34 moves 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 becomes 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 restoring 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, it is necessary to process the pressing surface 54 taking into consideration the direction of the pressing surface 54 before deformation so that the pressing surface 54 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] The following describes a fourteenth embodiment of the present invention. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to FIG. The fourteenth embodiment of the present invention is characterized in that, in the thirteenth embodiment, by press-fitting the pressing portions 22 into the corresponding through slits 18, even if the fastening screws 24 are loosened too much and the pressing portions 22 of the pressing portion are completely removed from the corresponding through slits 18, the pressing portions 22 are engaged and held in the pair of through slits 18, thereby effectively preventing them from falling off, whereas in this embodiment, although the pressing portions 22 are prevented from falling off in common, an insertion rod is inserted into the pressing bodies 34 of the pressing portions 22. 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. 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 further has an insertion rod 200 that can be inserted into the elongated hole 202 from the circular opening. 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 screw portion 206, and the insertion rod 200 is a set screw 200 of a fixed diameter that can be screwed into the female screw 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 pressing body 34 so that the pressing body 34 can move within a predetermined range when the set screw 200 is inserted into the insertion hole 204, and does not need to penetrate the pressing body 34 in the thickness direction. The female screw portion 206 is provided along 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 screwed into the female screw portion 206 until the tip protrudes into the insertion hole 204. As a variant, the female screw portion 206 does not have to be provided over the entire length of the elongated hole 202, but may be provided with a clearance hole from the circular opening of the elongated hole 202 partway up to allow the set screw 200 to be inserted, and may be provided from near the side surface near the end of the outer tube 14 to the side surface, thereby making it possible to easily attach the set screw 200. Also, 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. 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. However, in the case of a metal pressing portion 22, machining requires a certain amount of effort, whereas in this embodiment, the pressing portion 22 has a U-shaped side cross section, and while machining is simple, it is possible to effectively prevent the pressing portion 22 from falling off.

[0077] The fifteenth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic features of this embodiment will be described in detail with reference to Figures 42 to 46. The feature of the fifteenth embodiment of the present invention is that, while in the above-described embodiments the pressing body 34 is pressed against the outer peripheral surface 15 of the inner tube 12 by rotating the fastening screw portion 24 in a screw-in manner, in this embodiment a pressing lever mechanism 300 is used instead of the fastening screw portion 24 to press the pressing body 34 against the outer peripheral surface 15 of the inner tube 12.

[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 by, for example, screwing. The pressing lever mechanism 300 has 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 a 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 that separates it into opposing rotating portions, a pin 304 is positioned within the notch 310, and the pivot 306 that passes 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 around 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 lightweightness. 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 pushed down sufficiently 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] More specifically, as shown in Figure 44, at the non-pressing circumferential position, the curved circumferential surface 308 has a distance R1 between the center O of the pivot 306 and the upper surface 44 of the pressing body 34, a distance R2 between the center O of the pivot 306 and the upper surface of the pressing body 34 at the pressing start circumferential position (Figure 42), and a distance R3 between the center O of the pivot 306 and the upper surface of the pressing body 34 at the pressing end circumferential position, with R1 > R2 > R3, and as a result, the pressing body 34 is pressed against the outer peripheral surface 15 of the inner tube 12 due to the difference between R2 and R3. The difference between R2 and R3 should be set so that the pressing force of the pressing body 34 is sufficient to hold the inner and outer tubes 12 and 14 in place. For example, if the thickness of the outer tube 14 is several millimeters, the difference between R2 and R3 should be approximately 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 made up of a combination of multiple arc portions that are smoothly connected to each other, or it may be an ellipse whose major axis corresponds to R3. It is preferable to determine the curved shape of the grip lever portion 302 so that 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 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 stands upright with its lower end screwed to the outer circumferential surface 16 of the outer tube 14, and has a through-hole (not shown) in the middle 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 of threading of the pin 304 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 a 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 circumferential surface of the pin 304 from positions diametrically opposite each other and extending in opposite directions. If the height of the pivot 306 from the outer peripheral surface 16 of the outer tube 14 does not need to be adjusted, the lower end of the pin 304 may be fixed without being provided with a rotatable threaded portion.

[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] 47(A), in order 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 FIG. 47(B), male thread 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 thread portion 326, so that main body portion 322 is supported rotatably relative to male thread portion 310. The diameter of male thread 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 pushing 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 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 pushed down, the pressing lever 300 can be firmly fixed to the male screw portion 310 in the up-and-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 toward 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 part of the pressing end face with the inner tube 12 is pressed and fixed against the inner peripheral surface of the outer tube 14.This means that 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, and even if the set screw 200 of the fourteenth embodiment, which requires time-consuming screwing, is omitted, pressing can be done with one touch by hand with a large torque 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, 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 as in the 13th embodiment or the set screw 200 as in 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 was explained 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 fixed support jig, and an integrated fixed holding jig, but other application examples are shown below.

[0086] 48 shows an example in which the present invention is applied to a music stand 400. The fixing support jig for the inner and outer tubes employs the thirteenth embodiment. In other words, by employing a clamping screw portion 24 that can be tightened by hand and a pressing body 34 with a V-shaped cross section, the mating portion of the inner and outer tubes 12, 14 can be fixed and held in place by tightening the clamping screw portion 24 without it being noticeable from the outside. This makes it possible to reliably prevent the music stand 402 from slipping downward during performance, and even when the clamping screw portion 24 is loosened when adjusting the height of the music stand 402 and the clamping screw portion 24 comes off the female thread portion of the outer tube 14, the pressing body 34 will remain 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 and 14 employs the fifteenth 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] 50 shows an example of application to a table. The fixing and supporting jig for the inner and outer tubes 12 and 14 employs the thirteenth embodiment. That is, by employing a V-shaped cross-section pressing body 34 together with a tightening screw portion 24 that can be tightened by hand on each of the four legs 604 of the table body 602, the tightening screw portion 24 is positioned below the table, facing inward so that it is not noticeable from the outside, and by tightening the tightening screw portion 24, the fitting portions of the inner and outer tubes 12, 14 can be fixed and held in place, making it suitable as a decorative table indoors, and also as a temporary dining table for outdoor activities outdoors in a tent, and by shortening the length of the legs, it can be transported to the site without being bulky.

[0089] 51 shows an example of application to a temporary tent frame. The fixing support jig for the inner and outer pipes 12 and 14 employs the 15th embodiment. That is, 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, by employing a pressure lever mechanism 300 that can be manually depressed, the fitting length of the inner and outer tubes 12, 14 can be adjusted during assembly of the temporary tent, and the fitting portions of the inner and outer tubes 12, 14 can be fixed and held in place with a single touch, reliably preventing the three-dimensional framework from collapsing even in bad weather or strong winds, for example. Furthermore, during disassembly, 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, thereby facilitating easy disassembly even for 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 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 by which the pin 304 is screwed into the outer tube 14 or the tubular base portion 30. Furthermore, when transporting to the site, the frame for the temporary tent can be made smaller by adjusting the fitting length of the inner and outer pipes 12, 14, so it can be transported without being bulky.

[0090] 52 and 53 show an example of application to a crotch. The fixing and supporting jig for the inner and outer tubes 12 and 14 employs the 15th embodiment. That is, in a forklift having inner and outer tubes 12, 14 that fit together, with a grip portion 804 at the tip of the outer tube 14 and a U-shaped portion 802 at the tip of the inner tube 12, by employing a pressing lever mechanism 300 that can be pressed down by hand, when adjusting the overall length of the forklift, 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. For example, when pressing the U-shaped portion 802 at the tip of the inner tube of the forklift against an opponent, the fitting portions of the inner and outer tubes 12, 14 can be securely fixed and held in place, and when adjusting the overall length of the forklift 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 move freely 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 rotation in the longitudinal direction 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 changing 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 rotation in the longitudinal direction 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 each other in the longitudinal direction may be provided in 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. [Example]

[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 pipe 12, an outer pipe 14 fitted onto the inner pipe 12, a tubular portion 102 firmly fixed to the end of the outer pipe 14 and equipped with a female threaded portion 72 and a pair of through slits 18 sandwiched between the female threaded portion 72, a metal pressing body with a U-shaped cross section and a clearance hole 32, and a fastening screw with a male threaded portion 26 that threads into the female threaded portion 72 of the outer pipe 14 through the clearance hole 32 of the pressing body. For comparison, a conventional jig was prepared in which the tubular portion 102 was provided with a pair of protruding flanges 116 facing each other in the longitudinal direction of the pipe, and a fastening screw was tightened against the female threaded portions 72 provided on each protruding flange 116 to narrow the clearance between the pair of protruding flanges 116, thereby pressing the inner peripheral surface of the outer pipe 14 against the outer peripheral surface 15 of the inner pipe 12. The specific test method was to apply a predetermined torque to the screw using a hammer wrench, so that the pressing surface of the pressing body was pressed against the outer surface 15 of the inner pipe 12, and then the lower end of the outer pipe 14 was placed on a horizontal test stand, thereby fixing 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 this test measured the limit load under a specified torque.

[0093] According to Figure 29, assuming that the outer tube 14 is made of brass, 32φ, and 4mm thick, and the inner tube 12 is made of brass with an M10 screw (1.5mm pitch), the torque is approximately 30N, giving a limit load of approximately 400KG. It was confirmed that if torque is applied mechanically, it can be used not only as a stand for everyday items, but also as an industrial stand for outdoor installation, such as a stand for solar panels. Furthermore, according to these results, when the supporting load is 100 kg, the required torque is approximately 7.5 N, which is one-fourth of 30 N, and is approximately five times the maximum torque of 1.6 N that can be achieved by hand. It was confirmed that if the grip diameter is increased five times, it is practically possible to grip it by hand and use hand force to apply a torque that can withstand a supporting load of 100 kg. According to Figures 30 to 32, for a maximum manual torque of 1.6N, the limit supporting load of the conventional product is approximately 200N, while for the prototype in this example it is 800N, which is about four times as much; for a torque of 0.8N within the manual force range, the limit supporting load of the ABS resin inner and outer pipes 12 and 14 is approximately 90N, while for the prototype in this example it is 270N, which is about three times as much; and it was confirmed that in the case of the ABS resin inner and outer pipes 12 and 14, shallow scratch-like depressions were formed in the longitudinal direction of the pipe at the contact points of the pressing surface on the outer surface of the inner pipe 12. Furthermore, 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 will increase, and even if the thickness of the inner pipe 12 is sufficient to prevent deformation of the inner pipe 12 itself when supporting the longitudinal load on the inner and outer pipes 12 and 14, scratches may be made on the outer peripheral surface 15 of the inner pipe 12, and in some cases dents may occur. Therefore, it is considered best to take into account the hardness of the resin of the inner pipe 12 and adjust the area of the pressing surface of the pressing body 34 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 manual force within a practical range is possible by selecting the diameter of the torque applying grip 132 according to the support load.

[0094] Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and changes without departing from the scope of the present invention. For example, in the first embodiment, from the viewpoint of protecting the outer surface of the inner pipe 12, it was explained that 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, this is not limited to this. When the inner and outer pipes 12, 14 are made of metal, in addition to the pressing surface 54 of the pressing body 34, 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, thereby making it possible to more firmly fix the position of the outer pipe 14 relative to the inner pipe 12, and 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 surface 1616 of the outer tube 14 within a predetermined distance from the female screw 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 surface 1616 of the tubular base portion 30 within a predetermined distance from the female screw portion 20.

[0095] For example, in the first embodiment, it was explained that the tightening screw portion 24 has a male thread portion 26 and a head portion 58 that is gripped with the fingers and rotated, while the female thread portion 20 is provided on the outer peripheral surface 1616 of the outer tube 14. However, without being limited to this, the male thread portion 26 may be provided on the outer peripheral surface 1616 of the outer tube 14, while the tightening 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, a single length adjustment jig is provided at a predetermined position on the inner and outer tubes 12, 14, but this is not limited to this. For example, if 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 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. [Brief explanation of the drawings]

[0096] [Figure 1] FIG. 2 is a partial perspective view of an outer tube 14 of the length adjusting jig according to the first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of a fastening screw portion 24 of the length adjusting jig according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view of a pressing body 34 of the length adjusting jig according to the first embodiment of the present invention. [Figure 4] FIG. 3 is a perspective view of a pressing body 34 of the length adjusting jig according to the first embodiment of the present invention. [Figure 5] 1 is a cross-sectional view of a length adjusting jig according to a first embodiment of the present invention. [Figure 6] 1 is a vertical cross-sectional view of a length adjusting jig according to a first embodiment of the present invention. [Figure 7] 1 is a schematic cross-sectional view of a length adjusting jig according to a first embodiment of the present invention. [Figure 8] FIG. 10 is a perspective view of a length adjusting jig according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view of a length adjusting jig according to a second embodiment of the present invention. [Figure 10] 7 is a view similar to FIG. 6 showing a length adjusting jig according to a second embodiment of the present invention. [Figure 11] FIG. 10 is an exploded perspective view of a length adjusting jig according to a third embodiment of the present invention. [Figure 12]FIG. 10 is an exploded perspective view of a length adjusting jig according to a fourth embodiment of the present invention. [Figure 13] FIG. 10 is an exploded perspective view of a length adjusting jig according to a fourth embodiment of the present invention. [Figure 14] FIG. 10 is an exploded perspective view of a length adjusting jig according to a fifth embodiment of the present invention. [Figure 15] FIG. 10 is an exploded perspective view of a length adjusting jig according to a sixth embodiment of the present invention. [Figure 16] FIG. 10 is an exploded perspective view of a length adjusting jig according to a sixth embodiment of the present invention. [Figure 17] FIG. 13 is an exploded perspective view of a length adjusting jig according to a modified example of the sixth embodiment of the present invention. [Figure 18] FIG. 13 is a perspective view of a length adjusting jig according to a seventh embodiment of the present invention. [Figure 19] 1 is a perspective view of a length adjustment jig according to a first embodiment of the present invention, applied to a musical instrument stand. FIG. [Figure 20] 1 is a perspective view of a length adjustment jig according to a first embodiment of the present invention when used as a microphone stand. FIG. [Figure 21] 1, showing a length adjusting jig according to an eighth embodiment of the present invention. FIG. [Figure 22] FIG. 13 is a perspective view of a length adjusting jig according to a ninth embodiment of the present invention, when used as an earthquake brace. [Figure 23] FIG. 10 is a perspective view of a modified example of the length adjusting jig according to the first embodiment of the present invention. [Figure 24] FIG. 19 is a perspective view of a device for supporting a rectangular plate-shaped weight and adjusting an inclination angle according to a tenth embodiment of the present invention. [Figure 25] FIG. 20 is a partially enlarged perspective view of an inclination angle adjusting jig of a device for supporting and adjusting the inclination angle of a rectangular plate-shaped heavy object according to a tenth embodiment of the present invention. [Figure 26] 13 is a partial cross-sectional view taken along line AA of the tilt angle adjusting jig of the device for supporting and adjusting the tilt angle of a rectangular plate-shaped heavy object according to the tenth embodiment of the present invention. FIG. [Figure 27] FIG. 19 is a perspective view of a traffic sign T orientation and position adjustment device according to an eleventh embodiment of the present invention. [Figure 28] FIG. 20 is a perspective view of a modified example of the orientation and position adjustment device for a traffic sign T according to the eleventh embodiment of the present invention. [Figure 29] 1 is a table showing test conditions for a limit support load measurement test. [Figure 30] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 31] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 32] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Figure 33] FIG. 10 is a perspective view of the inner and outer tubes around the length adjusting jig according to a modified example of the first embodiment of the present invention. [Figure 34] FIG. 10 is a side cross-sectional view of the inner and outer tubes around the length adjusting jig according to a modified example of the first embodiment of the present invention. [Figure 35] FIG. 10 is a perspective view of inner and outer tubes around a length adjusting jig according to another modified example of the first embodiment of the present invention. [Figure 36] FIG. 20 is a partially enlarged perspective view of the area around the length adjusting jig of FIG. 19. [Figure 37] FIG. 20 is a perspective view of the stand of FIG. 19 in a folded state. [Figure 38] FIG. 23 is a partial cross-sectional side view of the inner and outer tubes around a length adjusting jig according to a thirteenth embodiment of the present invention. [Figure 39] FIG. 23 is a partial cross-sectional side view of the inner and outer tubes around a length adjusting jig according to a thirteenth embodiment of the present invention. [Figure 40] FIG. 23 is a partial cross-sectional side view of the inner and outer tubes around a length adjusting jig according to a thirteenth embodiment of the present invention. [Figure 41] FIG. 23 is a partial cross-sectional side view of the inner and outer tubes around a length adjusting jig according to a fourteenth embodiment of the present invention. [Figure 42] FIG. 22 is a partial perspective view of the periphery of a length adjusting jig according to a fifteenth embodiment of the present invention. [Figure 43] FIG. 22 is a partial perspective view of the periphery of a length adjusting jig according to a fifteenth embodiment of the present invention. [Figure 44]FIG. 22 is a front view of the area around a length adjusting jig according to a fifteenth embodiment of the present invention. [Figure 45] FIG. 43 is a cross-sectional view of the fifteenth embodiment of the present invention taken along line AA in FIG. 42. [Figure 46] FIG. 45 is a front view of a modified example of the fifteenth embodiment of the present invention, corresponding to FIG. 44. [Figure 47] 3A and 3B are partial cross-sectional and partial perspective views of a variation of the pin 304 of the present invention. [Figure 48] FIG. 1 is an overall perspective view of a fixing and holding jig of the present invention applied to a music stand. [Figure 49] 1 is an overall perspective view of a fixing holding jig of the present invention applied to a bicycle. [Figure 50] FIG. 1 is an overall perspective view of a fixing and holding jig of the present invention applied to a table. [Figure 51] 1 is an overall perspective view of a fixing and holding jig of the present invention applied to a tent frame. [Figure 52] FIG. 1 is an overall perspective view of a fixing and holding jig of the present invention applied to a crotch. [Figure 53] FIG. 10 is an overall perspective view of a modified example in which the fixing holding jig of the present invention is applied to a crotch. [Explanation of symbols]

[0097] D Distance between a pair of slits W Rectangular plate-shaped heavy object P Plane formed by both support bars θ Tilt angle R1 Minimum radius R2 intermediate radius R3 maximum radius L Length of pressing lever 10 Length adjustment jig 12 Inner tube 14 Outer tube 15 Outer surface 16 Outer surface 17 Inner surface 18 Through slit 20 Female thread 22 Pressing part 24 Fastening screw 26 Male thread 28 One end 30 Tubular base 32 Stupid Hole 34 Pressing body 34 36 Shank 38 Bottom side 40 Annular Surfaces 42 Protrusion 44 Top side 46 Contact surface 48 Central part 50 End 54 Pressing surface 56 Slope 58 Head 65 Tubular protrusion 70 Nut 72 Female thread 74 Male thread 76 Coil spring 78 Protective plate 80 Shallow Groove 82 Elastic part 84 Shelf side fixing part 86 Contact surface 88 Reception Department 89 Contact surface 90 Ceiling side fixing part 92 Contact surface 94 Reception Department 96 Lower end surface 98 Upper end surface 100 Rectangular plate-shaped heavy object support and tilt angle adjustment device 101 Tilt angle adjustment jig 102 Tubular part 104 First support bar 106 Top 108 Axis 110 Bottom end 112 Second support bar 114 Tip surface 116 Pair of overhanging flanges 118 End 120 First through hole 122 Second through hole 124 X-shaped cross member 126 Diagonal Pipe 128 holes 130 Long slot 132 Torque applying grip 140 Inner surface 142 External surface 154 Aperture 200 Grub Screw 201 End face 202 slotted hole 204 Insertion hole 206 Female thread 208 Tip 300 Pressing lever mechanism 302 Grip lever part 303 Rotating part 304 pins 306 Axis 308 curved surface 310 Cutout 312 Tip 314 Space 316 Inside 318 Through hole 320 Hollow part 324 bottom 326 Female thread 328 Stupid Hole 330 Head 332 recess 334 Aperture 400 Music Stand 402 Music stand 404 Tripod part 500 bicycles 502 Saddle 600 tables 602 Table surface 700 Temporary Tent Frame 702 Legs 704 Roof 800 Sashimata 802 U-shaped part 804 Grip

Claims

1. A step of machining, 3D printer modeling, or lost wax processing a pair of through slits and a female screw portion on an outer surface corresponding to a fitting portion of a solid or hollow inner tube and a hollow outer tube that fit together; a step of preparing a pressing portion having a U-shaped cross section and a clearance hole, which passes through the pair of through slits from outside 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, and a tightening screw portion having a male 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 support load so that it can be firmly supported by hand force alone; and a step of manually tightening the clamping screw portion via a torque-applying grip at a predetermined fitting position, thereby threading the male threaded portion into the female threaded portion through the clear hole, thereby pressing and fixing the pressing portion toward the outer peripheral surface of the inner tube in surface contact with the outer peripheral surface of the inner tube, and directly 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 a fixing support jig for a stand that supports and fixes a heavy object with either the inner or outer tube, and completing the process of fixing the inner and outer tubes together in the longitudinal direction of the tubes.

2. 2. The method for manufacturing an integral structure of inner and outer pipes according to claim 1, further comprising a fastening screw portion having a male screw portion, and the outer pipe is formed with a female screw portion into which the male screw portion can be threaded.

3. A fixing and holding jig that is interposed between an inner tube and an outer tube that are fitted together and that fixes and holds the inner and outer tubes, The outer surface of the outer tube is provided with a pair of spaced-apart through slits, at least one pressing portion that passes through the through slit from the outer peripheral surface of the outer tube and contacts the outer peripheral surface of the inner tube, the pressing portion has 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, the pair of pressing bodies each have a pressing end surface that can be pressed against the outer circumferential surface of the inner tube, The device further includes a pressing lever having an annular peripheral surface that rotates around an axis parallel to the load receiving surface while contacting 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 corresponding through slits by rotating the pressing lever; a fixing and holding jig for inner and outer tubes, characterized in that 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 directly 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 directly 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 directly pressed and fixed against the inner peripheral surface of the outer tube.

4. 4. The fixture for integrally fixing and holding an inner and outer tube according to claim 3, wherein the pair of through slits are provided in a tubular base portion that is attached and fixed to the outer peripheral surface of one end of the outer tube, and the inner tube is fitted to the outer tube via the tubular base portion.

5. 5. The integral fixing and holding jig for inner and outer tubes according to claim 3 or 4, 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 portion pivotally supported on the pivot and a gripping 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.

6. 6. The jig for integrally fixing and holding an inner and outer tube according to claim 5, wherein the rotating part is pivotally supported on the pivot so that, when the pressing lever rotates to a position corresponding to the intermediate radius, a direction connecting the tip of the gripping part and the pivot is in a substantially upright position, and when the pressing lever rotates to a position corresponding to the second radius, a direction connecting the tip of the gripping part and the pivot is in a pressed-down position.

7. 7. The jig for integrally fixing and holding an inner and outer tube according to claim 6, wherein the rotating portion has the annular circumferential surface having the second radius over a predetermined central angle range with respect to the pivot axis in accordance with a desired pressing force applied by the pair of pressing bodies to the outer circumferential surface of the inner tube.

8. 8. The jig for integrally fixing and holding an inner and outer tube according to claim 7, wherein the rotating part has a notch in a direction intersecting the pivot shaft and comprises 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 shaft can pass, each rotating part has a second through hole through which the pivot shaft can pass rotatably, and the first through hole and the second through hole can be aligned and positioned so that the pivot shaft can pass through.

9. 4. The jig for integrally fixing and holding an inner and outer tube according to claim 3, wherein the annular peripheral surface is elliptical, and a major axis of the ellipse constitutes the second radius.

10. 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 or outer tube as described in claim 1 or 3 at the fitting portion between the inner or outer tube or between the inner tube and a tubular base portion attached and fixed to the outer surface of one end of the outer tube.

11. A table in which the table body is fixedly supported to 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 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 described in claim 1 or claim 3.

12. A vehicle in which a saddle and / or handlebars are fixedly supported on either the inner or outer tube, and which has the inner or outer tube fixing support jig described in claim 1 or claim 3 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.

13. 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 having a fixing support jig for the inner and outer tubes described in claim 1 or claim 3 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 surface of one end of the outer tube.

14. A tether has a U-shaped portion fixed and supported to the tip of either the inner or outer tube, and has a fixing support jig for the inner and outer tubes described in claim 1 or claim 3 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.

15. A cart having a caster 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 described in claim 1 or claim 3 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.

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