Length adjusting jig, fixing and supporting jig, length adjusting method and fixing and supporting method

Abstract

Provided is a length adjustment jig (10) capable of adjusting the overall length of an inner tube (12) and an outer tube (14) by a simple operation with a simple configuration. A length adjustment jig (10) interposed between an inner tube (12) and an outer tube (14) that are fitted to each other is characterized in that a pair of through-slits (18) are provided on the outer peripheral surface (16) of the outer tube (14) at a distance from each other, a female thread section (20) is provided between the pair of through-slits (18), the length adjustment jig (10) has a pressing section (22) positioned on the outer peripheral surface (16) of the outer tube (14), and a fastening screw section (24) for fastening the inner tube (12) and the outer tube (14). And a fastening screw part (24) that is capable of pressing and fixing the pressing part (22) to the outer peripheral surface (15) of the inner tube (12) and that has a male thread part (26) that can be screwed to the female thread part (20), and that is capable of fastening the pressing part (22) to the outer peripheral surface (15) of the inner tube (12) after the fitting position of the inner tube (12) with respect to the outer tube (14) is adjusted, and that is capable of fastening the pressing part (22) to the outer peripheral surface (15) of the inner tube (12) after the fitting position of the inner tube (12) with respect to the outer tube (14) is adjusted. The pressing part (22) is pressed and fixed to the outer peripheral surface (15) of the inner tube (12) by inserting the pressing part (22) through the pair of insertion slits (18) while the male thread part (26) and the female thread part (20) are screwed together by the fastening screw part (24), without providing a pressing part accommodating space that has an opening facing the inner peripheral surface (17) of the outer tube (14) and protrudes to the outside of the outer tube (14), and the pressing part (22) is pressed and fixed to the outer peripheral surface (15) of the inner tube (12) by inserting the pressing part (22) through the pair of insertion slits (18).

Description

Technical Field

[0001] The present invention relates to a length adjustment jig, a fixed support jig, a length adjustment method, and a fixed support method. More specifically, the present invention relates to a length adjustment jig, a fixed support jig, a length adjustment method, and a fixed support method, which can adjust the overall length of an inner tube and an outer tube by simple operation using a simple structure, and can universally adjust the overall length of the inner tube and the outer tube for the length adjustment jig and the existing interlocking structure of the inner tube and the outer tube. Background Art

[0002] In the prior art, inner and outer tube components are used for various purposes such as racks for supporting daily necessities at a desired height, clothes drying rods, suction pipes of vacuum cleaners, height adjustment of bicycle seats, etc., wherein the inner and outer tube components can adjust the overall length of the inner and outer tubes by adjusting the interlocking length of the inner and outer tubes that are interlocked with each other. Such inner and outer tube components capable of adjusting lengths are usually manually adjusted to adjust the fitting length of the inner tube relative to the outer tube, thereby adjusting the length of the bracket, adjusting the length of the rod according to the amount of laundry, or adjusting the height of the seat. More specifically, the outer circumferential surface of one end of the inner tube is fitted into the inner circumferential surface from the opening of one end of the outer tube, and after the fitting length is appropriately adjusted, the top end of the external threaded portion is brought into contact with the outer circumferential surface of one end of the inner tube and is fastened and fixed by rotating a fastening screw, thereby fixing the fitting length, wherein the fastening screw has an external threaded portion that is screwed into the internal threaded portion of a circular through hole provided on the outer circumferential surface of the outer tube. Depending on the situation, by such fastening and fixing, the inner and outer pipes can be arranged in the vertical direction, and a heavy object can be supported by the inner or outer pipe and maintained at a predetermined height, thereby using the inner and outer pipes as a bracket.

[0003] However, the jig for adjusting the length of the inner and outer pipe members in the prior art has the following technical problems. The first aspect is that even if the length of the inner and outer tube members can be adjusted, it is not enough to maintain the adjusted length of the inner and outer tube members. In more detail, the fastening screw enters the internal thread portion of the outer tube by rotating around the length direction of the external thread. Therefore, even if the top end of the fastening screw portion is shaped in a curved shape along the outer peripheral surface of the inner tube, the top end of the fastening screw portion and the outer peripheral surface of the inner tube only make surface contact accidentally depending on the rotational position when the top end contacts the outer peripheral surface of the inner tube. When the inner and outer tubes have curved outer circumferences like a circular cross section, the point contact or line contact between the tip of the fastening screw and the outer circumference of the inner tube is insufficient to fix the inner tube relative to the outer tube, making it difficult to maintain the length of the inner and outer tube components.

[0004] The second aspect is that when used as a stand for supporting a heavy object, there is a tendency for the fastening force to be insufficient, and the fitting and fixing may accidentally come off, causing the heavy object to fall. In more detail, the weight of the heavy object is supported by the friction force between the top end of the external thread portion of the fastening screw portion at the fitted position and the outer peripheral surface 15 of the inner tube 12. As a result, the resistance of the top end of the external thread portion, which constitutes a part of the friction force, relative to the outer peripheral surface 15 of the inner tube 12 sometimes decreases over time due to loosening of the screw, etc. However, in order to compensate for the lack of fixing and retaining, for example, when the bracket supports a heavy object, it is time-consuming, labor-intensive, inconvenient and impractical to tighten multiple fastening screws separately. Therefore, if you want to ensure the fastening and fixing force, the top end of the external threaded portion sometimes leaves a mark or dent on the outer peripheral surface of one end of the inner tube, which may cause deterioration from the functional and aesthetic point of view. In particular, when the inner and outer tubes are made of resin, excessive fastening force may cause cracks or ruptures on the outer peripheral surface of the inner tube.

[0005] The third aspect is that, for example, when supporting a heavy object in a state where the inner and outer tubes themselves are relatively long in the up and down directions, correspondingly, when the thickness of the tubes, especially the thickness of the outer tube, is relatively thick, the external threaded portion needs to penetrate the thickness of the outer tube and reach the outer peripheral surface 15 of the inner tube 12. Naturally, it is necessary to ensure the length of the external threaded portion, and accordingly, time and effort are required to screw it in, which is inconvenient and impractical. Accordingly, when the fastening screw is screwed into the outer tube from the outer surface side of the outer tube and the top end is fixed to the outer peripheral surface 15 of the inner tube 12, even if the fitting length of the inner and outer tubes can be adjusted, the practicality of adjusting the fitting length of the inner and outer tubes itself can only be said to be useful for limited purposes. Summary of the invention [Technical problem to be solved by the invention]

[0006] In view of the above technical problems, the technical problem to be solved by the present invention is to provide a length adjustment jig capable of adjusting the overall length of the inner tube and the outer tube with a simple structure and through simple operation. In view of the above technical problems, the technical problem to be solved by the present invention is to provide a fixed support jig and a fixed support method, in which a weight object is supported at a specified height by the interlocking structure of an inner tube and an outer tube, and the overall length of the inner tube and the outer tube can be adjusted by a simple structure and simple operation, thereby adjusting the height position of the weight object. In view of the above technical problems, the technical problem to be solved by the present invention is to provide a length adjustment method and a fixed support method, which can universally adjust the overall length of the inner tube and the outer tube for the existing interlocking structure of the inner tube and the outer tube. [Technical solutions for solving technical problems]

[0007] In order to achieve the above technical problem, the length adjustment jig of the present invention is composed of: Between the inner tube and the outer tube, A pair of through slits spaced apart from each other are provided on the outer peripheral surface of the outer tube, and an internal thread portion is provided between the pair of through slits. It has a pressing portion and a fastening screw portion, wherein The pressing portion is positioned on the outer peripheral surface of the outer tube, penetrates the pair of through slits and contacts the outer peripheral surface of the inner tube; The fastening screw portion can press and fix the pressing portion to the outer peripheral surface of the inner tube. The fastening screw portion has an external thread portion that can be screwed together with the internal thread portion. After adjusting the fitting position of the inner tube relative to the outer tube, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding toward the outside of the outer tube is not provided. Instead, the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and the pressing portion is passed through the pair of through slits and is pressed and fixed to the outer circumferential surface of the inner tube.

[0008] According to the length adjustment jig having the above structure, when adjusting the length of the fitting portion of the inner and outer tubes that fit together by means of the internal threaded portion respectively provided on the outer surface of the outer tube, at least one through hole within a predetermined range from the internal threaded portion, at least one pressing portion that penetrates through the through hole from the outer peripheral surface of the outer tube and contacts the outer peripheral surface of the inner tube, and a fastening screw portion that can press and fix the pressing portion to the outer peripheral surface of the inner tube, the top end surface of the pressing portion is formed into a shape along the outer peripheral surface of the inner tube in a manner that can contact the outer peripheral surface of the inner tube. Accordingly, after adjusting the fitting position of the inner tube relative to the outer tube, There is no pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding toward the outside of the outer tube. Instead, the external threaded portion is screwed into the internal threaded portion provided on the outer circumferential surface of the outer tube by rotating the fastening screw portion, and the pressing portion within a specified range is passed through the through hole from the internal threaded portion by screwing the fastening screw portion in, thereby being pressed and fixed in a manner that the top end surface is in surface contact with the outer circumferential surface of the inner tube. This makes it possible to adjust the overall length of the inner tube and the outer tube in a fixable and maintainable manner through simple operation using a simple structure and without excessive fastening force.

[0009] In order to achieve the above technical problem, the length adjustment jig of the present invention is disposed between the inner tube and the outer tube which are embedded with each other, and is characterized in that: It has a tubular base portion, a pressing portion and a fastening screw portion, wherein: The tubular base portion has a pair of through slits spaced apart from each other on the outer circumferential surface, and an internal thread portion disposed between the pair of through slits, and the tubular base portion is mounted and fixed to the outer circumferential surface of one end portion of the outer tube; The pressing portion is positioned on the outer peripheral surface of the tubular base portion, penetrates the pair of through slits and contacts the outer peripheral surface of the inner tube; The fastening screw portion can press and fix the pressing portion to the outer peripheral surface of the inner tube. The fastening screw portion has an external thread portion that can be screwed together with the internal thread portion. After adjusting the fitting position of the inner tube relative to the tubular base portion, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding toward the outside of the outer tube is not provided, but the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and the pressing portion is passed through the pair of through slits to be pressed and fixed to the outer circumferential surface of the inner tube.

[0010] In addition, a pressing body having a longitudinal section roughly in the shape of a Japanese katakana "コ" may be provided, wherein the pressing body has: a clearance hole portion through which the external thread portion of the fastening screw portion passes in the thickness direction; and two pressing portions extending from the clearance hole portion in opposite directions to each other. The pressing body is located above the outer tube or the tubular base portion, and the external thread portion passes through the gap hole portion and is fastened to the internal thread portion, thereby enabling the outer tube or the tubular base portion to be fixed to the inner tube through the pressing portion. Furthermore, the fastening screw portion may include a rod portion and the external thread portion extending downward from a lower surface of the rod portion. An annular surface surrounding the external thread portion is formed on the lower surface. The pressing body has a protrusion on the upper surface, and the clearance hole is provided in the protrusion. By screwing the external threaded portion and the internal threaded portion together, the lower surface of the rod portion and the upper surface of the protrusion of the pressing body come into contact with each other, whereby the fastening screw portion and the pressing body are integrally pressed and fixed to the inner tube and screwed and fixed to the outer tube.

[0011] Furthermore, a contact surface capable of contacting the outer peripheral surface of the outer tube or the tubular base portion may be provided on the back surface of the central portion of the pressing body. In addition, the pressing body may include a central portion provided with the gap hole portion, and the pair of pressing portions may include legs extending downward from corresponding ends of the central portion, respectively, and pressing surfaces may be provided at lower ends of the legs. In addition, the pressing body may have a central portion provided with the gap hole portion, the pair of pressing portions may respectively have inclined portions extending downward as a whole from corresponding ends of the central portion, the pair of pressing portions may respectively extend from lower ends of the inclined portions as a whole, and a pressing surface may be provided on the lower surface. Furthermore, the fastening screw portion may include a head portion that can be rotated by pinching with fingers at an end portion on the side opposite to the end portion on the side of the external thread portion of the rod portion.

[0012] Furthermore, the tubular base portion may be a hollow cylindrical portion whose one end can be fitted over one end portion of the outer tube, and the inner tube may be inserted at the other end thereof with a predetermined gap from the outer peripheral surface of the tubular base portion. In addition, the pair of through slits may be provided at a predetermined interval in the circumferential direction of the inner and outer tubes so as to extend along the longitudinal direction of the inner and outer tubes. In addition, the length adjustment jig may be made of resin.

[0013] Furthermore, the length adjustment jig may be used for a clothes drying rod for adjusting the overall length of the inner and outer tubes, or a suction tube of a vacuum cleaner. Furthermore, the pair of through slits may be spaced a predetermined distance apart from each other in the longitudinal direction of the inner and outer tubes and respectively arranged to extend in the circumferential direction of the inner and outer tubes, the inner and outer tubes being oriented in the vertical direction, and the weight being supported at a predetermined height by either of the inner and outer tubes. In addition, the length adjustment jig may be made of metal. Furthermore, the length adjustment jig may be used in a stand that supports daily necessities at a predetermined height, or in a vehicle that supports a seat at a predetermined height.

[0014] In order to achieve the above technical problem, the length adjustment method of the inner and outer tubes of the present invention is composed of: In the existing inner and outer tubes that fit together, The steps include: forming a pair of through slits spaced apart from each other and an internal thread portion between the pair of through slits on the outer peripheral surface of one end side of the outer tube; and The pressing portion and the fastening screw portion are prepared, wherein the pressing portion is positioned on the outer peripheral surface of the outer tube, penetrates the pair of through slits and contacts the outer peripheral surface of the inner tube; the fastening screw portion has an external thread portion that can be screwed with the internal thread portion, and can press and fix the pressing portion to the outer peripheral surface of the inner tube, After adjusting the fitting position of the inner tube relative to the outer tube, the external threaded portion is screwed with the internal threaded portion by the fastening screw portion, and the pressing portion is passed through the pair of through slits to be pressed and fixed to the outer peripheral surface of the inner tube.

[0015] In order to achieve the above technical problems, the fixed support fixture of the present invention is composed of: It is located between the inner tube and the outer tube which extend in the vertical direction and fit into each other, and is used to fix and support the heavy object at a specified height. An internal thread portion and a pair of through slits are provided on the outer surface of the outer tube, and the pair of through slits are spaced apart from each other in the vertical direction with the internal thread portion sandwiched therebetween. It has at least one pressing portion and a fastening screw portion, wherein At least one of the pressing parts 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 fastening screw portion can press and fix the pressing portion to the outer peripheral surface of the inner tube. The fastening screw portion has an external thread portion that can be screwed together with the internal thread portion. The pressing portion includes a pair of pressing bodies, the longitudinal sections of the pair of pressing bodies are substantially in the shape of a Japanese katakana character "コ", and can press the outer peripheral surface of the inner tube by making surface contact with the outer peripheral surface of the inner tube at two locations by the tightening of the fastening screw portion, and the pair of pressing bodies are spaced apart from each other. The pair of pressing bodies each have a pressing end surface capable of pressing the outer peripheral surface of the inner tube, When a heavy object is supported by either the inner and outer tubes, after adjusting the fitting position of the inner tube relative to the outer tube according to the specified height of the heavy object, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding toward the outside of the outer tube is not provided. Instead, the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and the pressing portion is passed through the through gap, so that the pressing end face is in surface contact with the outer circumferential surface of the inner tube, and the outer circumferential surface of the inner tube on the opposite side of the surface contact portion between the pressing end face and the inner tube is pressed and fixed to the inner circumferential surface of the outer tube.

[0016] In order to achieve the above technical problems, the fixed support fixture of the present invention is composed of: It is located between the inner tube and the outer tube, and is used to fix and support the weight at a specified height. It has a tubular base portion, a fastening screw portion and at least one pressing portion, wherein: The tubular base portion has an internal thread portion on the outer circumferential surface, and has at least a through hole on the outer circumferential surface within a specified range from the internal thread portion, and the tubular base portion is mounted and fixed to the outer circumferential surface of one end portion of the outer tube; The fastening screw portion can press and fix the pressing portion to the outer peripheral surface of the inner tube; At least one of the pressing parts passes through the through hole from the outer peripheral surface of the tubular base part and contacts the outer peripheral surface of the inner tube. The pressing portion has a pressing end surface capable of pressing the outer peripheral surface of the inner tube by surface contact. The fastening screw portion has an external thread portion that can be screwed together with the internal thread portion. After adjusting the fitting position of the inner tube relative to the tubular base portion, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding toward the outside of the tubular base portion is not provided. Instead, the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and the pressing portion is passed through the through hole, so that the pressing end surface is pressed and fixed in a manner of surface contact with the outer circumferential surface of the inner tube.

[0017] In addition, the pressing end surface may have a hardness that is not deformed by pressing the outer peripheral surface of the inner tube. The pressing end surface is formed along the outer peripheral surface of the inner tube. Furthermore, the inner tube and the outer tube may be respectively cylindrical, and the outer circumferential surface of the inner tube may be pressed and fixed relative to the inner circumferential surface of the outer tube in such a manner that the outer circumferential surface of the inner tube on the opposite side of the pressing and fixing portion formed by the pressing end surface is pressed and fixed relative to the inner circumferential surface of the outer tube in line contact in the up and down directions, and the outer tube may be fixedly supported to the inner tube by three supports. Furthermore, the fastening screw portion may include a rod portion and the external thread portion extending downward from a lower surface of the rod portion. An annular surface surrounding the external thread portion is formed on the lower surface. The pressing body has a protrusion on the upper surface, and a clearance hole is provided in the protrusion. By screwing the external threaded portion into engagement with the internal threaded portion via the clearance hole, the lower surface of the rod portion abuts against the upper surface of the protrusion of the pressing body, whereby the fastening screw portion and the pressing body are integrally pressed and fixed to the inner tube and screwed and fixed to the outer tube.

[0018] In addition, the fastening screw portion may include a head portion that can be rotated by pinching with fingers at an end portion on the opposite side to the end portion on the external thread portion side of the rod portion. In addition, the fixed support fixture can be made of metal, and the pair of through slits are separated from each other by a specified interval in the length direction of the inner and outer tubes, and are respectively arranged in a manner extending along the circumferential direction of the inner and outer tubes, so that the weight is supported at a specified height by either side of the inner and outer tubes.

[0019] In order to achieve the above technical problem, the fixed support method of the inner and outer tubes of the present invention is composed of: In the existing inner and outer tubes that fit together, The method comprises the following steps, namely, drilling and processing at least one through hole and an internal threaded portion within a predetermined range of the at least one through hole on the outer peripheral surface of one end side of the outer tube, and preparing a pressing portion and a fastening screw portion, wherein the pressing portion is positioned on the outer peripheral surface of the outer tube and has a pressing end surface that penetrates the through hole and can press the outer peripheral surface of the inner tube by surface contact, and the fastening screw portion has an external threaded portion that can be screwed with the internal threaded portion, and can press and fix the pressing portion to the outer peripheral surface of the inner tube, The pressing end surface has a hardness that is not deformed by pressing the outer peripheral surface of the inner tube, and is formed along the outer peripheral surface of the inner tube. The at least one through hole is a pair of through slits spaced apart from each other, the pressing portions are provided in pair corresponding to the pair of through slits, and the fastening screw portion has a head portion whose lower surface can abut against the upper surface of each of the pressing portions. When a heavy object is supported by either the inner and outer tubes, after adjusting the fitting position of the inner tube relative to the outer tube according to the specified height of the heavy object, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding to the outside of the outer tube is not provided, but the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and at the same time, the lower surface of the head presses the upper surface of the pressing portion against the outer circumferential surface of the inner tube, and the pressing end surfaces are pressed and fixed in a manner of surface contact with the outer circumferential surface of the inner tube, and the outer circumferential surface of the inner tube on the opposite side of the surface contact portion between the pressing end surface and the inner tube is pressed and fixed to the inner circumferential surface of the outer tube, so that the heavy object is fixedly supported at the specified height. DETAILED DESCRIPTION

[0020] Next, refer to the attached Figure 1 A first embodiment of the length adjustment jig 10 of the present invention will be described in detail. like Figures 1 to 6 As shown, the length adjustment jig 10 is located between the inner tube 12 and the outer tube 14 which are fitted into each other, and is roughly composed of a pressing body 22 and a fastening screw portion 24, wherein the pressing body 22 has a pressing surface 54 which can be pressed on the outer peripheral surface 15 of the inner tube 12; and the fastening screw portion 24 can press and fix the pressing portion 22 to 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 are preferably selected according to the application. As described later, the overall length of the inner tube 12 and the outer tube 14 is adjusted by adjusting the fitting length of the inner tube 12 and the outer tube 14 .

[0021] For example, the inner tube 12 and the outer tube 14 are both hollow cylindrical, and the outer tube 14 is sheathed on the inner tube 12 by inserting the inner circumferential surface 17 of the outer tube 14 from one end opening into the outer circumferential surface 15 of the inner tube 12 . As will be described later, when the inner tube 12 is embedded in the outer tube 14, a slight gap may be provided between the inner circumferential surface 17 of the outer tube 14 and the outer circumferential surface 15 of the inner tube 12, as long as the outer tube 14 can be fixedly held relative to the inner tube 12 in the longitudinal direction by the tightening screw portion 24 via the pressing body 22. The slight gap is, for example, 0.05 mm to 0.1 mm. A pair of through slits 18 are provided on the outer peripheral surface 16 of the outer tube 14 at a distance D from each other, and an internal thread portion 20 is provided between the pair of through slits 18. As described later, the distance D between the pair of through slits 18 can be selected according to the purpose of the length adjustment jig 10.

[0022] The pair of through slits 18 are spaced a predetermined distance apart from each other in the longitudinal direction of the inner tube 12 and the outer tube 14 , and are provided so as to extend in the longitudinal direction of the inner tube 12 and the outer tube 14 . More specifically, the pair of through slits 18 are respectively elongated openings, and the width of the openings is sufficient as long as the pressing portion 22 can penetrate in the thickness direction. As described later, since the pressing body is fastened to the outer tube 14 by the fastening screw portion 24, the pressing portion 22 does not need to penetrate the pair of through slits 18 provided on the outer peripheral surface 16 of the outer tube 14 in an interference fit manner.

[0023] The pressing portion 22 is positioned on the outer peripheral surface 16 of the outer tube 14 , penetrates through the pair of through slits 18 , and contacts the outer peripheral surface 15 of the inner tube 12 . More specifically, the pressing body 34 has a longitudinal section roughly in the shape of the Japanese Katakana character "コ", and has: a clearance hole portion 32, through which the external thread portion 26 of the fastening screw portion 24 passes along the thickness direction; and two pressing portions 22, which extend from the clearance hole portion 32 in opposite directions. The pressing body 34 has a central portion 48 provided with a clearance hole portion 32, and a pair of pressing portions 22 each have an inclined portion 56 extending downward from the corresponding end portion of the central portion 48 as a whole, and the pair of pressing portions 22 each extend from the lower end of the inclined portion 56 as a whole, and a pressing surface 54 is provided on the lower surface 38. The pressing surface 54, which is the top end surface of the pressing portion 22, is shaped along the outer peripheral surface 15 of the inner tube 12 so as to be able to contact the outer peripheral surface 15 of the inner tube 12. For example, if the outer peripheral surface 15 of the inner tube 12 is the outer surface of a cylinder, the cross section of the pressing surface 54 is an arc shape with a diameter of the cylinder. 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 tube 12, and therefore, the pressing surface 54 can be pressed against the outer peripheral surface 15 of the inner tube 12 in a direction that makes the arc-shaped cross section match the outer peripheral surface 15 of the inner tube 12.

[0024] The pressing body 34 has a protrusion 42 on the upper surface 44, and a gap hole portion 32 is provided on the protrusion 42. By screwing the external thread portion 26 into the internal thread portion 20, the lower surface 38 of the rod portion 36 abuts against the upper surface 44 of the protrusion 42 of the pressing body 34. Accordingly, the fastening screw portion 24 and the pressing body 34 are pressed and fixed to the inner tube 12 as a whole, and are screwed and fixed to the outer tube 14. The pressing body 34 is located above the outer tube 14 , and the external thread portion 26 passes through the clearance hole portion 32 and is fastened to the internal thread portion 20 , thereby making it possible to fix the outer tube 14 to the inner tube 12 via the pressing portion 22 .

[0025] 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 planar abutment surface 46 is provided around the lower end opening of the clearance hole portion 32, and the external thread portion 26 is screwed into the internal thread portion 20 of the outer peripheral surface 16 of the outer tube 14 by the tightening screw portion 24 until the lower surface of the rod portion 36 abuts against the annular surface of the pressing body 34, whereby the pressing surface 54 is tightened and fixed to the outer peripheral surface 15 of the inner tube 12 in a state where the abutment surface 46 abuts against the outer peripheral surface 16 of the outer tube 14. Thus, the inner tube 12 and the outer tube 14 are fixedly held at a predetermined fitting length by the tightening screw portion 24 and the pressing body 34.

[0026] The fastening screw portion 24 is configured to press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The fastening screw portion 24 has a rod portion 36 and an external thread portion 26 extending downward from a lower surface 38 of the rod portion 36. The external thread portion 26 can be screwed into the internal thread portion 20, and an annular surface 40 surrounding the external thread portion 26 is formed on the lower surface 38. After adjusting the fitting position of the inner tube 12 with respect to the outer tube 14 , the pressing portion 22 is passed through the pair of through slits 18 while the external thread portion 26 is screwed to the internal thread portion 20 by the fastening screw portion 24 , and is pressed and fixed to the outer peripheral surface 15 of the inner tube 12 . The fastening screw portion 24 has a head 58 that can be rotated by pinching with fingers at the end portion on the side opposite to the end portion on the external thread portion side of the rod portion 36. It is preferable that the diameter of the head 58 is as large as possible so that the head 58 can be rotated by pinching with fingers with a small force, and from the viewpoint of anti-slip, a plurality of shallow grooves can be provided at intervals in the circumferential direction.

[0027] like Figure 7 As shown, by screwing the external threaded portion 26 of the fastening screw portion 24 into the internal threaded portion 20 of the outer tube 14, the pressing end surface 54 is pressed against the outer circumferential surface of the inner tube 12 through the slit of the outer tube 14, and the inner tube 12 is moved until the portion of the outer circumferential surface of the inner tube 12 on the opposite side in the diameter direction contacts the inner circumferential surface of the outer tube 14. Thus, the inner tube 12 is firmly fixed to the outer tube 14 by the support of three locations in total, namely, the pressing end surfaces 54 (C2) at two locations and the line contact (C1) extending along the length direction of the tube. In this case, by screwing the external threaded portion 26 into the internal threaded portion 20, the lower surface 38 of the rod portion 36 and the upper surface 44 of the protrusion 42 of the pressing body 34 abut against each other, thereby, the fastening screw portion 24 and the pressing body 34 are pressed and fixed to the inner tube 12 as a whole, and are screwed and fixed to the outer tube 14. Therefore, the height H of the Japanese katakana "コ" character of the pressing portion 22 needs to be larger than the thickness of the outer tube 14 + the gap d between the inner and outer tubes 14. In addition, when a heavy object is fixedly supported at a specified height by the inner and outer tubes 14 extending in the up-down direction, the fixed support effect is higher when the inner and outer tubes 12, 14 are spaced apart in the extending direction compared to the case where the pair of pressing bodies 34 of the pressing portion 22 are spaced apart in the circumferential direction of the inner tube 12, 14. When the area of ​​the pressing end face 54 of the pressing body 34 is constant, the friction force between the pressing end face 54 and the outer circumferential surface of the inner tube 12 based on the tightening force of the tightening screw portion 24 is very important for the fixed support. As a result, it is preferred that the tightening force per unit area is larger. In this sense, it is better to provide multiple pressing end faces 54.

[0028] Regarding the purpose of the length adjustment jig 10, a pair of through slits 18 are arranged in a manner that they are separated from each other by a specified interval along the length direction of the inner tube 12 and the outer tube 14 and extend along the circumferential direction of the inner tube 12 and the outer tube 14 respectively. The inner tube 12 and the outer tube 14 are oriented in the vertical direction, and a weight is supported at a specified height by either the inner tube 12 or the outer tube 14. In particular, by using the length adjustment jig 10 to adjust the fitting length of the inner tube 12 and the outer tube 14 extending in the up-down direction, when the heavy object is fixed at a specified height, from the viewpoint of supporting the weight of the heavy object by the friction 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 to the outer peripheral surface 15 of the inner tube 12, that is, the tightening force of the fastening screw portion 24, the better. Therefore, strength that can withstand a large tightening force is required. Therefore, it is preferred that the pressing portion 22 and the fastening screw portion 24, as well as the inner tube 12 and the outer tube 14 that constitute the length adjustment jig 10 are made of metal. The length adjustment jig 10 can be used in a stand that supports daily necessities at a predetermined height, or in a vehicle that supports a seat at a predetermined height. like Fig.19 As shown, a pair of inner tubes 12 and outer tubes 14 that are interlocked with each other using a length adjustment jig are arranged in parallel with a specified interval and extend obliquely upward, the lower parts of the outer tubes 14 in the pair of inner tubes 12 and outer tubes 14 are connected to each other through components Y3 and Y5, and a steel drum (musical instrument) to be supported at a specified height is arranged between the upper parts of the inner tubes 12 in the pair of inner tubes 12 and outer tubes 14, and is obliquely hung from the upper ends of each inner tube 12, and components Y1 and Y2 are connected to the lower parts of the outer tubes 14 in the inner tubes 12 and outer tubes 14 in a manner that they respectively firmly support the pair of inner tubes 12 and outer tubes 14 extending obliquely upward, thereby supporting the steel drum (musical instrument) at four points. In this case, the steel drum (musical instrument) is supported and fixed at a desired height in the horizontal direction by adjusting the fitting lengths of the inner tube 12 and the outer tube 14 to the same length using a length adjustment jig. In addition, if Fig. 20 As shown, when used as a microphone stand, the outer tube is entirely fitted into the outer circumference of a tilt rod to which the microphone is fixed at one end for height adjustment. If a length adjustment jig 10 is used at the fitting position, not only the height of the microphone can be adjusted, but also the lateral position can be easily adjusted.

[0029] As a modified example, the length adjustment jig 10 may be made of resin from the viewpoint of lightness, and in particular, it is preferable to ensure a sufficient thickness from the viewpoint of ensuring strength around the opening of the pair of slits and the internal thread portion 20 even if the pair of slits and the internal thread portion 20 are provided. In this case, the pair of through slits 18 are preferably provided at a predetermined interval in the circumferential direction of the inner tube 12 and the outer tube 14 and extend in the circumferential direction of the inner tube 12 and the outer tube 14 . The length adjustment jig 10 is used, for example, in a clothes drying pole for adjusting the overall length of the inner tube 12 and the outer tube 14 . In the case of a clothes drying rod, in order to adjust the overall length of the clothes drying rod composed of the inner tube 12 and the outer tube 14 according to the amount of laundry to be dried, the length adjustment jig 10 can be used to adjust the fitting length of the inner tube 12 and the outer tube 14 .

[0030] According to the length adjustment jig having the above structure, when adjusting the length of the fitting portion of the inner tube 12 and the outer tube 14 that fit together by means of the internal threaded portion 20 respectively provided on the outer peripheral surface 16 of the outer tube 14, at least one through slit 18 within a predetermined range from the internal threaded portion 20, at least one pressing portion 22 that penetrates through the through slit 18 from the outer peripheral surface 16 of the outer tube 14 and contacts the outer peripheral surface 15 of the inner tube 12, and a fastening screw portion 24 that can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, the top end surface of the pressing portion 22 is formed in a shape along the outer peripheral surface 15 of the inner tube 12 in a manner that can make surface contact with the outer peripheral surface 15 of the inner tube 12, thereby adjusting the relative length of the inner tube 12 After the outer tube 14 is in the fitting position, there is no need to provide a pressing portion accommodating space having an opening facing the inner circumferential surface 17 of the outer tube 14 and protruding toward the outside of the outer tube 14. Instead, the external threaded portion 26 is screwed into the internal threaded portion 20 provided on the outer circumferential surface 16 of the outer tube 14 by rotating the fastening screw portion 24, and the pressing portion 22 within a specified range is passed through the slit 18 from the internal threaded portion 20 by screwing the fastening screw portion in, thereby being pressed and fixed in a manner that the top end surface is in contact with the outer circumferential surface 15 of the inner tube 12. Thus, the overall length of the inner tube 12 and the outer tube 14 can be adjusted in a fixable and retainable manner through simple operation using a simple structure and without excessive fastening force. In addition, although it is described that the cross-sections of the inner tube 12 and the outer tube 14 are circular, the pressing surface 54 of the pressing body 34 is in close contact with the outer surface of the inner tube 12, has the same diameter as the diameter of the inner tube 12, and has an arc-shaped cross-section, and describes that when the diameters of the inner tube 12 and the outer tube 14 are different, a pressing body 34 with a pressing surface 54 corresponding to their diameters is prepared, but it is not limited to this. When the inner tube 12 and the outer tube 14 have a plane such as a rectangular cross-section, the pressing surface 54 of the pressing body 34 can be in close contact with the outer surface of the inner tube 12 so that the cross-section is flat, and can be common to the inner tubes 12 and the outer tubes 14 with various rectangular cross-sections.

[0031] Hereinafter, in particular, in the conventional inner tube 12 and outer tube 14 that are fitted together, if a method of adjusting the lengths of the inner tube 12 and outer tube 14 is described, the method has the following stages: A stage in which a pair of through slits 18 spaced apart from each other and an internal thread portion 20 located between the pair of through slits 18 are bored in the outer peripheral surface 16 at one end side of the outer tube 14; and The pressing portion 22 and the fastening screw portion 24 are prepared, wherein the pressing portion 22 is positioned on the outer peripheral surface 16 of the outer tube 14, passes through a pair of through slits 18 and contacts the outer peripheral surface 15 of the inner tube 12; the fastening screw portion 24 has an outer thread portion 26 that can be screwed with the inner thread portion 20, and can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, After adjusting the fitting position of the inner tube 12 with respect to the outer tube 14 , the pressing portion 22 is passed through the pair of through slits 18 while the external thread portion 26 is screwed to the internal thread portion 20 by the fastening screw portion 24 , and is pressed and fixed to the outer peripheral surface 15 of the inner tube 12 . According to the above method, in the existing inner tube 12 and outer tube 14, by drilling one end of the outer tube 14, the overall length of the inner tube 12 and the outer tube 14 can be adjusted in common with the existing fitting structure of the inner tube 12 and the outer tube 14.

[0032] Next, a second embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are given the same reference numerals and their descriptions are omitted. Figures 8 to 10 The characteristic parts of this embodiment will be described in detail. The second embodiment of the present invention is characterized in that a tubular base portion 30 is provided on the outer tube 14, a length adjustment jig 10 is interposed between the inner tube 12 and the outer tube 14 which are fitted together, and has a pressing portion 22 and a fastening screw portion 24, wherein the pressing portion 22 passes through a pair of through slits 18 and contacts the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 has a screw thread that can be screwed with the internal thread portion 20. The outer threaded portion 26 is the same as the first embodiment in this respect. However, in the first embodiment, a pair of through slits 18 are provided on the outer peripheral surface 16 of the outer tube 14, and the internal threaded portion 20 is provided between the pair of through slits 18. However, in the present embodiment, a tubular base portion 30 is provided and fixed to one end of the outer tube 14, and a pair of through slits 18 spaced apart from each other and the internal threaded portion 20 provided between the pair of through slits 18 are provided on the outer peripheral surface 16 of the tubular base portion 30.

[0033] More specifically, the tubular base portion 30 is a hollow cylindrical portion whose one end can be fitted over the one end portion 28 of the outer tube 14 , and the inner tube 12 is inserted at the other end thereof with a predetermined gap from the outer peripheral surface 16 of the tubular base portion 30 . According to the above structure, after adjusting the fitting position of the inner tube 12 relative to the tubular base portion 30 , the external thread portion 26 is screwed into the internal thread portion 20 by the tightening screw portion 24 , while the pressing portion 22 is passed through a pair of through slits 18 and pressed and fixed to the outer peripheral surface 15 of the inner tube 12 . The tubular base portion 30 may be fixed to one end of the outer tube 14 by, for example, screw fixation or fixation by interference fit, as long as it is firmly fixed to the outer tube 14 . For the existing inner tube 12 and outer tube 14, a pressing portion 22 and a fastening screw portion 24 capable of pressing and fixing the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12 are prepared, and a tubular base portion 30 having a pair of through slits 18 and an internal threaded portion 20 between a pair of through slits 18 on the outer peripheral surface 16 is prepared, thereby enabling the fitting length of the inner tube 12 and the outer tube 14 to be adjusted.

[0034] Next, a third embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are given the same reference numerals and their descriptions are omitted. Fig.11 The characteristic parts of this embodiment will be described in detail. 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, a length adjustment jig 10 interposed between the inner tube 12 and the outer tube 14 that are fitted with each other, having a pressing portion 22 and a fastening screw portion 24, wherein the pressing portion 22 penetrates a pair of through slits 18 and contacts the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 has an external thread portion 26 that can be screwed with the internal thread portion 20. In this respect, it is the same as the first embodiment, but in the first embodiment, the outer peripheral surface 16 of the outer tube 14 has a pair of through slits 18 and the internal thread portion 20 located therebetween. In contrast, in the present embodiment, a tubular protrusion 65 is provided at a position corresponding to the internal thread portion 20 and is arranged outwardly and orthogonally to the outer peripheral surface 16 of the outer tube 14. More specifically, the tubular protrusion 65 is a circular annular cross section of a predetermined height h, and the internal thread portion 20 is formed inside in a manner aligned with the internal thread portion 20, and the external thread portion 26 of the fastening screw portion 24 can be screwed therewith. The tubular protrusion 65 can be independent of the outer tube 14 and fixed to the outer peripheral surface 16 by welding, for example. In addition, the outer shape of the tubular protrusion 65 does not need to be cylindrical, and can be any shape as long as the internal thread portion 20 is formed inside in a manner aligned with the internal thread portion 20. According to this embodiment, it is effective in the case where the thickness of the outer tube 14 is thin and the screwing length of the external thread portion 26 cannot be ensured to be sufficient, and the predetermined height h can be determined from this point of view. In addition, when the pressing portion 22 is pressed and fixed to the outer peripheral surface 15 of the inner tube 12, the length of the external thread portion 26 is set so that the top end of the external thread portion 26 does not contact the outer peripheral surface 15 of the inner tube 12, which is the same as the first embodiment. In addition, as a modified example, in contrast, when the thickness of the outer tube 14 is thick, the outer circumference of the inner thread portion 20 between the pair of through slits 18 of the outer circumferential surface 16 of the outer tube 14 may be ground toward the inside to form a shallow groove portion (not shown) having a bottom surface, and a through hole having the inner thread portion 20 is provided on the bottom surface. The depth of the shallow groove portion, that is, the depth of grinding the outer circumferential surface 16 can be appropriately set according to the thickness of the outer tube 14 and / or the length of the outer thread portion 26, thereby ensuring universality regardless of the conditions of the inner tube 12, the outer tube 14, and the fastening screw portion 24.

[0035] Next, a fourth embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals to omit their descriptions. Fig.12 and Fig.13 The characteristic parts of this embodiment will be described. The fourth embodiment of the present invention is characterized by a fastening screw portion 24, a length adjustment jig 10 between an inner tube 12 and an outer tube 14 that are fitted together, having a pressing portion 22 and a fastening screw portion 24, wherein the pressing portion 22 passes through a pair of through slits 18 and contacts the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, which is the same as the first embodiment, but in the first embodiment, on the one hand, the fastening screw portion 24 has an external thread portion 26, and on the other hand, a pair of through slits 18 and an internal thread portion 20 located between the pair of through slits 18 are provided on the outer peripheral surface 16 of the outer tube 14, but in the present embodiment, on the contrary, on the one hand, the fastening screw portion 24 has a nut portion 70 with an internal thread portion 72, and on the other hand, an external thread portion 74 is provided on the outer peripheral surface 16 of the outer tube 14. In more detail, the central part of the nut part 70 is provided with an internal thread part 72 that can be screwed with the external thread part 74, and a shallow groove is provided on the outer peripheral surface from the viewpoint of preventing slipping when tightened by hand. On the other hand, at the position of the internal thread part 20 of the outer peripheral surface 16 of the outer tube 14, the external thread part 74 is provided toward the outside in a direction perpendicular to the outer peripheral surface 16 of the outer tube 14, and the internal thread part 20 is omitted. The external thread part 74 can be fixed to the outer peripheral surface 16 by welding, for example. According to this embodiment, when the nut portion 70 is loosened, the pressing body 34 itself remains inserted into the external thread portion 74 through the gap hole 32. Therefore, as in the first embodiment, when the fastening screw portion 24 is loosened, the pressing body 34 itself can be prevented from accidentally falling off and dispersing.

[0036] Next, a fifth embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals and their descriptions are omitted. Fig.14 The characteristic parts of this embodiment will be described. The fifth embodiment of the present invention is characterized in that a coil spring 76 is arranged between the outer peripheral surface 16 of the outer tube 14 and the pressing portion 22, a length adjustment jig 10 between the inner tube 12 and the outer tube 14 that are fitted with each other, having a pressing portion 22 and a fastening screw portion 24, wherein the pressing portion 22 passes through a pair of through slits 18 and contacts the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 has an external thread portion 26 that can be screwed with the internal thread portion 20. In this respect, it is the same as the first embodiment, but such a coil spring 76 is not provided in the first embodiment. In more detail, a coil spring 76 is provided, and the external thread portion 26 of the fastening screw portion 24 is inserted into the coil spring 76 via the gap hole 32 of the pressing portion 22. The coil spring 76 has a diameter larger than the diameter of the internal thread portion 20, and the number of turns of the coil can be appropriately set according to the height of the Japanese Katakana "コ" character of the pressing portion 22. According to the present embodiment, when the external threaded portion 26 of the fastening screw portion 24 is screwed into the internal threaded portion 20, the pressing portion 22 is supported on the upper surface of the coil spring 76, so that the pressing end surface 54 protrudes from the corresponding through-slit 18 toward the outer peripheral surface 15 of the inner tube 12, thereby preventing interference when the inner tube 12 is moved relative to the outer tube 14 along the extension direction of the tube in order to adjust the fitting position of the inner tube 12 and the outer tube 14. Furthermore, by increasing the loading force of the coil spring 76, when the coil spring 76 disposed between the outer peripheral surface 16 of the outer tube 14 and the pressing portion 22 is compressed, the pressing portion 22 is pressed upward toward the side of the fastening screw portion 24, and the screwed state of the external thread portion 26 and the internal thread portion 20 becomes firm. For example, it is also possible to prevent in advance the fastening of the fastening screw portion 24 from loosening over time, thereby preventing the fixed support between the inner tube 12 and the outer tube 14 that are fitted together from becoming unstable.

[0037] Next, a sixth embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals and their descriptions are omitted. Figures 15 to 17 The characteristic parts of this embodiment will be described in detail. The sixth embodiment of the present invention is characterized in that a protective plate 78 is arranged between the inner tube 12 and the outer tube 14, and a length adjustment jig 10 between the inner tube 12 and the outer tube 14 that are interlocked with each other has a pressing portion 22 and a fastening screw portion 24, wherein the pressing portion 22 passes through a pair of through slits 18 and contacts the outer peripheral surface 15 of the inner tube 12; the fastening screw portion 24 can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 has an external thread portion 26 that can be screwed with the internal thread portion 20. In this respect, it is the same as the first embodiment, but such a protective plate 78 is not provided in the first embodiment. More specifically, the protection plate 78 has a width W longer than the length of the pair of through slits 18, a length L longer than the distance between the pair of through slits 18 in the extending direction of the inner and outer tubes 14, and is made of a material softer than the outer peripheral surface 15 of the inner tube 12, such as Fig.16 As shown, a shallow groove 80 of a size that a protective plate 78 can be inserted is provided on the inner peripheral surface of the outer tube 14 provided with a pair of through slits 18. When the protective plate 78 is inserted into the shallow groove 80, it protrudes slightly inward from the inner peripheral surface of the outer tube 14. Accordingly, when the pressing portion 22 is pressed and fixed to the outer peripheral surface 15 of the inner tube 12 by tightening the fastening screw portion 24, the protective plate 78 is also crushed, and it is possible to prevent the pressing end surface 54 from directly contacting the outer peripheral surface 15 of the inner tube 12 and damaging or recessing the outer peripheral surface 15 of the inner tube 12. In addition, by making the protective plate 78 made of rubber with a high friction coefficient, the friction between the protective plate 78 and the outer peripheral surface 15 of the inner tube 12 is ensured, thereby making the fixed support between the inner tube 12 and the outer tube 14 more secure. in addition, Fig.17 It is a modified example in which a pair of protective plates 82 are provided and each protective plate 82 is configured to be able to be embedded in the corresponding through gap 18. When the pressing portion 22 is pressed and fixed to the outer peripheral surface 15 of the inner tube 12, each protective plate 82 is also crushed to prevent the outer peripheral surface 15 of the inner tube 12 from being damaged or recessed, and to ensure the friction between the protective plate 82 and the outer peripheral surface 15 of the inner tube 12. In this respect, they are the same, but the shallow groove 80 provided on the inner peripheral surface of the outer tube 14 can be omitted.

[0038] Next, a seventh embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are given the same reference numerals and their descriptions are omitted. Fig.18 The characteristic parts of this embodiment will be described in detail. The seventh embodiment of the present invention is characterized in that the direction of the pair of through slits 18 and the internal threaded portion 20 between the pair of through slits 18 is a length adjustment jig 10 between the inner tube 12 and the outer tube 14 that are fitted together, and has a pressing portion 22 and a fastening screw portion 24, wherein the pressing portion 22 passes through the pair of through slits 18 and contacts the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 has an external thread that can be screwed with the internal threaded portion 20. The groove portion 26 is the same as the first embodiment in this respect, but in the first embodiment, the direction of the pair of through slits 18 and the internal thread portion 20 between the pair of through slits 18 provided on the outer peripheral surface 16 of the outer tube 14 is along the extension direction of the inner tube 12 and the outer tube 14. In contrast, in the present embodiment, the direction of the pair of through slits 18 and the internal thread portion 20 between the pair of through slits 18 is inclined relative to the extension direction of the inner tube 12 and the outer tube 14, and accordingly, the direction of the pressing body 34 provided through the pair of through slits 18 becomes inclined. According to the present embodiment, in addition to fixedly supporting the inner tube 12 and the outer tube 14 in the extending direction of the inner tube 12 and the outer tube 14, it is also effective to fix and hold the inner tube 12 and the outer tube 14 with respect to the rotation between the inner tube 12 and the outer tube 14 centered on the extending direction of the inner tube 12 and the outer tube 14. The angle at which the pair of through slits 18 and the internal threaded portion 20 between the pair of through slits 18 are inclined relative to the extending direction of the inner tube 12 and the outer tube 14 is preferably determined from this viewpoint.

[0039] Next, an eighth embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals and their descriptions are omitted. Fig.21 The characteristic parts of this embodiment will be described in detail. The eighth embodiment of the present invention is characterized in that a pressing body 34 is arranged on the outer tube 14, a length adjustment jig 10 between the inner tube 12 and the outer tube 14 that are fitted with each other, having a pressing portion 22 and a fastening screw portion 24, wherein the pressing portion 22 passes through the through-slit 18 and contacts the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 can press and fix the pressing portion 22 to the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 has an external thread portion 26 that can be screwed with the internal thread portion 20. In this respect, it is the same as the first embodiment, but in the first embodiment, a pair of through-slits 18 are provided on the outer peripheral surface 16 of the outer tube 14, and correspondingly, the pressing body 34 has a gap hole portion 32 in the center and a pair of pressing surfaces 54, but in the present embodiment, a single through-slit 18 is provided, and correspondingly, a single pressing body 34 is provided.

[0040] More specifically, a solid pressing body 34 is provided that can be fitted into a 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 of the head 58 of the fastening screw part 24 from the internal thread part 20. Accordingly, when the head 58 of the fastening screw part 24 is manually rotated to screw the external thread part 26 into the outer peripheral surface 15 of the inner tube 12 relative to the internal thread part 20, the lower surface of the head 58 contacts the upper surface 40 of the pressing body 34, and the pressing body 34 can be pressed into the outer peripheral surface 15 of the inner tube 12, similarly to the first embodiment. The pressing surface 54 of the pressing body 34 is shaped 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, which is also similar to the first embodiment. Compared to the first embodiment, the present embodiment is more suitable for adjusting the overall length of the inner tube 12 and the outer tube 14, such as a clothes drying pole, compared to the case where the length adjustment jig 10 is applied to the inner tube 12 and the outer tube 14 in the vertical direction to support a heavy object at a specified height.

[0041] Next, a ninth embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are given the same reference numerals and their descriptions are omitted. Fig. 22 The characteristic parts of this embodiment will be described in detail. The eighth embodiment of the present invention is characterized in that the length adjustment jig 10 is used as a so-called earthquake support. In more detail, for example, in order to prevent furniture, such as shelves, from collapsing during an earthquake, there is a ceiling-side fixing portion 90 provided on the upper end surface 98 side 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 side 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 includes a contact surface 92 that can contact the ceiling surface, and includes a receiving portion 94 that can receive an upper end surface 98 . The shelf side fixing part 84 has a contact surface 89 and a contact surface 86, wherein the contact surface 89 is orthogonal to each other in a manner that can be installed in the gap between the wall and the shelf at the corner of the orthogonally intersecting wall, the contact surface 86 can contact the top surface of the shelf, and the shelf side fixing part 84 has a receiving part 88 that can receive the lower end surface 96. According to this structure, the fitting position of the inner tube 12 and the outer tube 14 is adjusted in a manner that the contact surface 92 of the ceiling side fixing part 90 contacts the ceiling surface and the contact surface 86 of the shelf side fixing part 84 contacts the top surface of the shelf, thereby adjusting the total length of the inner tube 12 and the outer tube 14, and thereafter, the inner peripheral surface of the outer tube 14 can be firmly fixed and supported on the outer peripheral surface of the inner tube 12 by the pressing part 22 using the fastening screw part 24. For example, a plurality of such length adjustment jigs 10 are provided between the ceiling and the shelf, thereby enabling the shelf to be firmly fixed to the ceiling.

[0042] The above detailed description of the embodiments of the present invention is within the scope of the present invention, and those skilled in the art can make various modifications or changes. For example, in the first embodiment, from the perspective of protecting the outer surface of the inner tube 12, it is described that the top end of the external threaded portion 26 of the fastening screw portion 24 penetrates the outer tube 14 or the internal threaded portion 20 of the tubular base portion without contacting the outer surface of the inner tube 12, but it is not limited to this. In the case where the inner tube 12 and the outer tube 14 are made of metal, in addition to the pressing surface 54 of the pressing body 34, by making the top end of the external threaded portion 26 of the fastening screw portion 24 also contact the outer surface of the inner tube 12, the position of the outer tube 14 relative to the inner tube 12 can be fixed more firmly, which is effective for setting the inner tube 12 and the outer tube 14 in the vertical direction and supporting the heavy object at a specified height by either the inner tube 12 or the outer tube 14. For example, in the third embodiment, a single through slit 18 is provided on the outer peripheral surface 16 of the outer tube 14 at a prescribed interval from the internal threaded portion 20, but the present invention is not limited to this. As in the second embodiment, a tubular base portion 30 may be provided and fixed to one end of the outer tube 14, and a single through slit 18 may be provided on the outer peripheral surface 16 of the tubular base portion 30 at a prescribed interval from the internal threaded portion 20.

[0043] For example, in the first embodiment, it is described that the fastening screw portion 16 has an external thread portion 26 and a head portion 58 for being rotated by pinching with fingers, and in contrast, an internal thread portion 20 is provided on the outer peripheral surface 16 of the outer tube 14. However, this is not limited to this. In contrast to providing the external thread portion 26 on the outer peripheral surface 16 of the outer tube 14, the fastening screw portion 16 may also be in the shape of a nut that is screwed together with the external thread portion 26. For example, in the first embodiment, it is described that a single length adjustment jig is provided at a specified position of the inner tube 12 and the outer tube 14, but it is not limited to this. For example, it is also possible that a pair of through slits 18 are provided at intervals along the length direction of the inner and outer tubes 14, and multiple groups of such a pair of through slits 18 are provided in the circumferential direction of the inner tube 12 and the outer tube 14, and correspondingly, a plurality of pressing portions 22 are provided. In addition, in the second to seventh embodiments, any combination is possible. For example, when the thickness of the outer tube 14 is relatively thin and the outer peripheral surface of the inner tube 12 is smooth, a tubular protrusion 65 can be provided on the outer peripheral surface of the outer tube 14, and a protective plate 78 can be provided between the inner tube 12 and the outer tube 14. For example, when the inner and outer tubes are fixedly held while suppressing relative rotation in the extension direction for a long time, a coil spring 76 can be provided between the outer peripheral surface 16 of the outer tube 14 and the pressing portion 22, and the direction of the pair of through slits 18 and the internal threaded portion 20 between the pair of through slits 18 is inclined relative to the extension direction of the inner tube 12 and the outer tube 14. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a partial perspective view of the outer tube of the length adjustment jig according to the first embodiment of the present invention. Figure 2 It is a perspective view of a fastening screw portion of the length adjustment jig according to the first embodiment of the present invention. Figure 3 It is a perspective view of the pressing body of the length adjustment jig according to the first embodiment of the present invention. Figure 4 It is a perspective view of the pressing body of the length adjustment jig according to the first embodiment of the present invention. Figure 5 It is a cross-sectional view of the length adjustment jig according to the first embodiment of the present invention. Figure 6 It is a longitudinal sectional view of the length adjustment jig concerning the first embodiment of the present invention. Figure 7 It is a schematic cross-sectional view of the length adjustment jig according to the first embodiment of the present invention. Figure 8 It is a perspective view of a length adjustment jig according to a second embodiment of the present invention. Fig. 9 It is a perspective view of a length adjustment jig according to a second embodiment of the present invention. Fig.10 The length adjustment jig according to the second embodiment of the present invention is Figure 6 Same picture. Fig.11It is an exploded perspective view of a length adjustment jig according to a third embodiment of the present invention. Fig.12 It is an exploded perspective view of a length adjustment jig according to a fourth embodiment of the present invention. Fig.13 It is an exploded perspective view of a length adjustment jig according to a fourth embodiment of the present invention. Fig.14 It is an exploded perspective view of a length adjustment jig according to a fifth embodiment of the present invention. Fig.15 It is an exploded perspective view of a length adjustment jig according to a sixth embodiment of the present invention. Fig.16 It is an exploded perspective view of a length adjustment jig according to a sixth embodiment of the present invention. Fig.17 It is an exploded perspective view of a length adjustment jig according to a modified example of the sixth embodiment of the present invention. Fig.18 It is a perspective view of a length adjustment jig according to a seventh embodiment of the present invention. Fig.19 This is a perspective view of a case where the length adjustment jig according to the embodiment of the present invention is used as a musical instrument stand. Fig. 20 This is a perspective view of a case where the length adjustment jig according to the embodiment of the present invention is used as a microphone stand. Fig.21 The length adjustment jig according to the eighth embodiment of the present invention is Figure 1 Same picture. Fig. 22 This is a perspective view of a case where the length adjustment jig according to the embodiment of the present invention is used as an earthquake support. [Explanation of Reference Numerals]

[0045] D: interval between a pair of slits; 10: length adjustment jig; 12: inner tube; 14: outer tube; 15: outer peripheral surface; 16: outer peripheral surface; 17: inner peripheral surface; 18: through slit; 20: internal thread; 22: pressing portion; 24: fastening screw portion; 26: external thread; 28: one end; 30: tubular base; 32: gap hole; 34: pressing body; 36: rod; 38: lower surface; 40: annular surface; 42: protrusion; 44: upper surface; 46: abutment Joint surface; 48: Central portion; 50: End portion; 54 Pressing surface; 56: Inclined portion; 58: Head portion; 65: Tubular protrusion; 70: Nut portion; 72 Internal thread portion; 74: External thread portion; 76: Coil spring; 78: Protective plate; 80: Shallow groove; 82: Elastic portion; 84: Shelf side fixing portion; 86: Abutment surface; 88: Receiving portion; 89: Abutment surface; 90: Ceiling side fixing portion; 92: Abutment surface; 94: Receiving portion; 96: Lower end surface; 98: Upper end surface.

Claims

1. A length adjustment jig, which is interposed between an inner tube and an outer tube that fit together, characterized in that: An internal threaded portion is provided on the outer surface of the outer tube, and at least a through hole is provided within a predetermined range from the internal threaded portion. The length adjustment jig has at least one pressing portion and a fastening screw portion, wherein: At least one of the pressing parts passes through the through hole from the outer peripheral surface of the outer tube and contacts the outer peripheral surface of the inner tube; The fastening screw portion can press and fix the pressing portion to the outer peripheral surface of the inner tube. The top end surface of the pressing portion is shaped along the outer peripheral surface of the inner tube so as to be able to make surface contact with the outer peripheral surface of the inner tube. The fastening screw portion has an external thread portion that can be screwed together with the internal thread portion. After adjusting the fitting position of the inner tube relative to the outer tube, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding toward the outside of the outer tube is not provided. Instead, the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and the pressing portion is passed through the through hole, so that the top end surface is pressed and fixed in a manner of surface contact with the outer circumferential surface of the inner tube.

2. A length adjustment jig, which is interposed between an inner tube and an outer tube that fit together, characterized in that: It has a tubular base portion, at least one pressing portion and a fastening screw portion, wherein: The tubular base portion has an internal thread portion on the outer circumferential surface, and has at least a through hole on the outer circumferential surface within a specified range from the internal thread portion, and the tubular base portion is mounted and fixed to the outer circumferential surface of one end portion of the outer tube; At least one of the pressing parts passes through the through hole from the outer peripheral surface of the tubular base part and contacts the outer peripheral surface of the inner tube; The fastening screw portion can press and fix the pressing portion to the outer peripheral surface of the inner tube. The top end surface of the pressing portion is shaped along the outer peripheral surface of the inner tube so as to be able to make surface contact with the outer peripheral surface of the inner tube. The fastening screw portion has an external thread portion that can be screwed together with the internal thread portion. After adjusting the fitting position of the inner tube relative to the tubular base portion, the external thread portion is screwed together with the internal thread portion through the fastening screw portion, and at the same time, the pressing portion is passed through the through hole so that the top end surface is pressed and fixed in a manner of surface contact with the outer peripheral surface of the inner tube.

3. The length adjustment jig according to claim 1 or 2, characterized in that: The through holes are provided in plurality at intervals from each other, and the pressing parts are provided in plurality according to the through holes. The fastening screw portion has a flange-shaped head portion, which is fixed to one end of the external thread portion and can be rotated by hand around the extending direction of the external thread portion. The flange-shaped head is sized such that, by screwing in the fastening screw portion, the lower surface can simultaneously press the upper portions of the plurality of pressing portions, and the plurality of pressing portions can simultaneously penetrate the corresponding through holes and press against the outer peripheral surface of the inner tube.

4. The length adjustment jig according to claim 3, characterized in that: The pressing portion is solid and has: an outer peripheral side surface, which is embedded with the inner peripheral surface of each of the multiple through holes; a lower end surface, which can be pressed on the outer peripheral surface of the inner tube; and an upper end surface, which is located on the side opposite to the lower end surface, and the top end surface is composed of the lower end surface.

5. The length adjustment jig according to claim 3, characterized in that: The plurality of through holes are a pair of through slits spaced apart from each other, and the external thread portion is disposed between the pair of through slits. The length adjustment jig is provided with a pressing body having a longitudinal section roughly in the shape of a Japanese katakana "コ" character, and the pressing body has: a gap hole portion, through which the external thread portion of the fastening screw portion passes in the thickness direction; and two pressing portions extending from the gap hole portion in opposite directions to each other. The pressing body is located above the outer tube or the tubular base portion, and the external thread portion passes through the gap hole portion and is fastened to the internal thread portion, thereby enabling the outer tube or the tubular base portion to be fixed to the inner tube through the pressing portion.

6. The length adjustment jig according to claim 5, characterized in that: The fastening screw portion includes a rod portion and the external thread portion extending downward from the lower surface of the rod portion. An annular surface surrounding the external thread portion is formed on the lower surface. The pressing body has a protrusion on the upper surface, and the clearance hole is provided in the protrusion. By screwing the external threaded portion and the internal threaded portion together, the lower surface of the rod portion and the upper surface of the protrusion of the pressing body come into contact with each other, whereby the fastening screw portion and the pressing body are integrally pressed and fixed to the inner tube and screwed and fixed to the outer tube.

7. The length adjustment jig according to claim 6, characterized in that: A contact surface capable of contacting the outer peripheral surface of the outer tube or the tubular base portion is provided on the back surface of the central portion of the pressing body.

8. The length adjustment jig according to claim 6, characterized in that: The pressing body has a central portion provided with the gap hole portion, and the pair of pressing portions each has a leg portion extending downward from a corresponding end portion of the central portion, and a pressing surface is provided at a lower end of the leg portion.

9. The length adjustment jig according to claim 6, characterized in that: The pressing body has a central portion provided with the gap hole portion, and the pair of pressing portions respectively have inclined portions extending downward as a whole from corresponding ends of the central portion, and the pair of pressing portions respectively extend as a whole from the lower ends of the inclined portions, and a pressing surface is provided on the lower surface.

10. The length adjustment jig according to claim 6, characterized in that: The fastening screw portion has a head portion that can be rotated by pinching with fingers at an end portion on the opposite side to an end portion of the rod portion on the side of the external thread portion.

11. The length adjustment jig according to claim 2, characterized in that: The tubular base portion is in a hollow cylindrical shape, one end of which can be fitted over one end of the outer tube, and the inner tube is inserted into the other end of the tubular base portion with a predetermined gap from the outer peripheral surface thereof.

12. The length adjustment jig according to claim 1 or 2, characterized in that: The length adjustment jig is made of resin, and the pair of through slits are spaced apart from each other by a predetermined interval in the circumferential direction of the inner and outer tubes and are provided so as to extend along the longitudinal direction of the inner and outer tubes.

13. The length adjustment jig according to claim 1 or 2, characterized in that: The length adjustment jig is made of metal, and the pair of through slits are separated from each other by a specified interval in the length direction of the inner and outer tubes, and are respectively arranged in a manner extending along the circumferential direction of the inner and outer tubes. The inner and outer tubes are oriented in the vertical direction, and a weight is supported at a specified height by either of the inner and outer tubes.

14. A method for adjusting the length of inner and outer tubes, characterized in that: In the existing inner and outer tubes that fit together, The method comprises the following steps, namely, drilling and processing at least one through hole and an internal threaded portion within a predetermined range of the at least one through hole on the outer peripheral surface of one end side of the outer tube, and preparing a pressing portion and a fastening screw portion, wherein the pressing portion is positioned on the outer peripheral surface of the outer tube, passes through the through hole and contacts the outer peripheral surface of the inner tube, and the fastening screw portion has an external threaded portion that can be screwed with the internal threaded portion, and can press and fix the pressing portion to the outer peripheral surface of the inner tube, After adjusting the fitting position of the inner tube relative to the outer tube, the external threaded portion is screwed together with the internal threaded portion by the fastening screw portion, and the pressing portion is passed through the through hole to be pressed and fixed to the outer peripheral surface of the inner tube.

15. The method for adjusting the length of inner and outer tubes according to claim 14, characterized in that: The at least one through hole is a pair of through slits spaced apart from each other, the pressing portions are provided in pair corresponding to the pair of through slits, the fastening screw portion has a head, and the lower surface of the head can abut against the upper surface of each of the pressing portions, The top end surface of each of the pressing parts is shaped along the outer peripheral surface of the inner tube so as to be in surface contact with the outer peripheral surface of the inner tube. During the stage of pressing and fixing the inner tube to the outer circumferential surface, the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and at the same time, the lower surface of the head presses the upper surface to the outer circumferential surface of the inner tube, and the top end surface is pressed and fixed in a manner of surface contact with the outer circumferential surface of the inner tube.

16. A fixed support fixture, which is interposed between an inner tube and an outer tube which extend in the up-down direction and fit into each other, and is used to fixedly support a heavy object at a specified height, characterized in that: An internal thread portion and a pair of through slits are provided on the outer surface of the outer tube, and the pair of through slits are spaced apart from each other in the vertical direction with the internal thread portion sandwiched therebetween. The fixed support fixture has at least one pressing portion and a fastening screw portion, wherein: At least one of the pressing parts 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 fastening screw portion can press and fix the pressing portion to the outer peripheral surface of the inner tube. The fastening screw portion has an external thread portion that can be screwed together with the internal thread portion. The pressing portion includes a pair of pressing bodies, the longitudinal sections of the pair of pressing bodies are substantially in the shape of a Japanese katakana character "コ", and can press the outer peripheral surface of the inner tube by making surface contact with the outer peripheral surface of the inner tube at two locations by the tightening of the tightening screw portion, and the pair of pressing bodies are spaced apart from each other. The pair of pressing bodies each have a pressing end surface capable of pressing the outer peripheral surface of the inner tube, When a heavy object is supported by either the inner and outer tubes, after adjusting the fitting position of the inner tube relative to the outer tube according to the specified height of the heavy object, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding toward the outside of the outer tube is not provided. Instead, the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and the pressing portion is passed through the through gap, so that the pressing end face is in surface contact with the outer circumferential surface of the inner tube, and the outer circumferential surface of the inner tube on the opposite side of the surface contact portion where the pressing end face is in surface contact with the inner tube is pressed and fixed to the inner circumferential surface of the outer tube.

17. A fixed support fixture, which is interposed between an inner tube and an outer tube that fit together, and is used to fixedly support a heavy object at a specified height, characterized in that: It has a tubular base portion, a fastening screw portion and at least one pressing portion, wherein: The tubular base portion has an internal thread portion on the outer circumferential surface, and has at least a through hole on the outer circumferential surface within a specified range from the internal thread portion, and the tubular base portion is mounted and fixed to the outer circumferential surface of one end portion of the outer tube; The fastening screw portion can press and fix the pressing portion to the outer peripheral surface of the inner tube; At least one of the pressing parts passes through the through hole from the outer peripheral surface of the tubular base part and contacts the outer peripheral surface of the inner tube. The pressing portion has a pressing end surface capable of pressing the outer peripheral surface of the inner tube by surface contact. The fastening screw portion has an external thread portion that can be screwed together with the internal thread portion. After adjusting the fitting position of the inner tube relative to the tubular base portion, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding toward the outside of the tubular base portion is not provided. Instead, the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and the pressing portion is passed through the through hole, so that the pressing end surface is pressed and fixed in a manner of surface contact with the outer circumferential surface of the inner tube.

18. The fixed support fixture according to claim 16 or 17, characterized in that: The pressing end surface has a hardness that is not deformed by pressing the outer peripheral surface of the inner tube. The pressing end surface is formed along the outer peripheral surface of the inner tube.

19. The fixed support fixture according to claim 18, characterized in that: The inner tube and the outer tube are respectively cylindrical in shape, and the outer circumferential surface of the inner tube is pressed and fixed relative to the inner circumferential surface of the outer tube in such a way that the outer circumferential surface of the inner tube on the opposite side of the pressing and fixing portion formed by the pressing end surface is pressed and fixed relative to the inner circumferential surface of the outer tube in a linear contact manner in the up and down directions, and the outer tube is fixedly supported to the inner tube by three supports.

20. The fixed support fixture according to claim 16, characterized in that: The fastening screw portion includes a rod portion and the external thread portion extending downward from the lower surface of the rod portion. An annular surface surrounding the external thread portion is formed on the lower surface. The pressing body has a protrusion on the upper surface, and a clearance hole is provided in the protrusion. By screwing the external threaded portion into engagement with the internal threaded portion via the clearance hole, the lower surface of the rod portion abuts against the upper surface of the protrusion of the pressing body, whereby the fastening screw portion and the pressing body are integrally pressed and fixed to the inner tube and screwed and fixed to the outer tube.

21. The fixed support fixture according to claim 20, characterized in that: The fastening screw portion has a head portion that can be rotated by pinching with fingers at an end portion on the opposite side to an end portion of the rod portion on the side of the external thread portion.

22. The fixed support fixture according to claim 16, characterized in that: The fixed support fixture is made of metal, and the pair of through slits are separated from each other by a specified interval in the length direction of the inner and outer tubes and are respectively arranged in a manner extending along the circumferential direction of the inner and outer tubes, so that the weight is supported at a specified height by either of the inner and outer tubes.

23. A method for fixing and supporting inner and outer tubes, characterized in that: In the existing inner and outer tubes that fit together, The method comprises the following steps, namely, drilling and processing at least one through hole and an internal threaded portion within a predetermined range of the at least one through hole on the outer peripheral surface of one end side of the outer tube, and preparing a pressing portion and a fastening screw portion, wherein the pressing portion is positioned on the outer peripheral surface of the outer tube and has a pressing end surface that penetrates the through hole and can press the outer peripheral surface of the inner tube by surface contact, and the fastening screw portion has an external threaded portion that can be screwed with the internal threaded portion, and can press and fix the pressing portion to the outer peripheral surface of the inner tube, The pressing end surface has a hardness that is not deformed by pressing the outer peripheral surface of the inner tube, and is formed along the outer peripheral surface of the inner tube. The at least one through hole is a pair of through slits spaced apart from each other, the pressing portions are provided in pair corresponding to the pair of through slits, the fastening screw portion has a head, and the lower surface of the head can abut against the upper surface of each of the pressing portions, When a heavy object is supported by either the inner and outer tubes, after adjusting the fitting position of the inner tube relative to the outer tube according to the specified height of the heavy object, a pressing portion accommodating space having an opening facing the inner circumferential surface of the outer tube and protruding to the outside of the outer tube is not provided, but the external threaded portion and the internal threaded portion are screwed together by the fastening screw portion, and at the same time, the lower surface of the head presses the upper surface of the pressing portion against the outer circumferential surface of the inner tube, and the pressing end surfaces are pressed and fixed in a manner of surface contact with the outer circumferential surface of the inner tube, and the outer circumferential surface of the inner tube on the opposite side of the surface contact portion where the pressing end surface is in surface contact with the inner tube is pressed and fixed to the inner circumferential surface of the outer tube, so that the heavy object is fixedly supported at the specified height.

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