Length adjustment jig and length adjustment method

Abstract

To provide a length adjustment jig capable of adjusting a total length of an inner pipe and an outer pipe with a simple structure and simple operation.SOLUTION: A length adjustment jig is interposed between an inner pipe and an outer pipe 14 which are fitted together, where a pair of through slits 18 is provided on an outer peripheral surface 16 of the outer pipe, a female screw part 20 is provided between the through slits, and a tightening screw part is positioned on the outer peripheral surface of the outer pipe and passes through the pair of through slits to be pressed and fixed against the outer peripheral surface of the inner pipe. The tightening screw part has a male screw part that can be screwed into the female screw part, and has an opening facing an inner peripheral surface 17 of the outer pipe after adjusting a fitting position of the inner pipe relative to the outer pipe. The male screw part is screwed into the female screw part by the tightening screw part without providing a pressing part storage space that protrudes outside the outer pipe, while a pressing part is passed through the pair of through slits to be pressed and fixed against the outer peripheral surface of the inner pipe.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a length adjustment tool and a length adjustment method, and more specifically, to a length adjustment tool that can adjust the overall length of an inner tube and an outer tube with a simple structure and easy operation, and a length adjustment method that can universally adjust the overall length of an inner tube and an outer tube for an existing fitting structure between an inner tube and an outer tube. [Background technology]

[0002] Conventionally, inner and outer tube components in which the overall length of the inner and outer tubes can be adjusted by adjusting the fitting length of the inner and outer tubes that fit together have been used for a variety of purposes, such as stands that support daily necessities at a desired height, clothes drying poles, suction tubes for vacuum cleaners, and height adjustment of bicycle saddles. Such length-adjustable inner and outer tube components are usually manually adjusted to adjust the length of the stand, the length of the pole depending on the number of laundry loads, or the height of the saddle by adjusting the fitting length of the inner tube relative to the outer tube. More specifically, the outer peripheral surface of one end of the inner tube is fitted into the inner peripheral surface from an opening at one end of the outer tube, and after the fitting length is appropriately adjusted, a fastening screw having a male threaded portion that screws into the female threaded portion of a circular through hole provided in the outer peripheral surface of the outer tube is rotated so that the tip of the male threaded portion abuts against the outer peripheral surface of one end of the inner tube and is tightened and fixed, thereby fixing the fitting length. In some cases, by tightening and fixing in this manner, the inner and outer tubes can be arranged vertically, and the inner or outer tube can support a heavy object and hold the heavy object at a predetermined height, making it possible to use the inner and outer tubes as a stand.

[0003] However, such conventional length adjusting jigs for the inner and outer tubular members have the following technical problems. First, even if it is possible to adjust the length of the inner and outer tubular members, the adjusted length of the inner and outer tubular members is not maintained sufficiently. More specifically, since the fastening screw is screwed into the female threaded portion of the outer tube by rotating the male thread around the longitudinal direction, even if the tip of the fastening screw portion is shaped to follow the curved shape of the outer peripheral surface of the inner tube, depending on the rotational position of the tip when it hits the outer peripheral surface of the inner tube, the tip of the fastening screw portion and the outer peripheral surface of the inner tube may just happen to be in surface contact with each other. When the inner and outer tubes have a curved outer peripheral surface, such as a circular cross section, there is point or line contact between the tip of the fastening screw and the outer peripheral surface of the inner tube, resulting in insufficient fixation of the inner tube to the outer tube and making it difficult to maintain the length of the inner and outer tube components.

[0004] Secondly, when used as a stand to support a heavy object, the fastening force tends to be insufficient, causing the interlocking fixation to suddenly come loose, causing the heavy object to fall. More specifically, the weight of the heavy object is supported by the frictional force between the tip of the male threaded portion of the fastening screw portion at the mating position and the outer peripheral surface 15 of the inner tube 12. However, the resistance of the tip of the male threaded portion to the outer peripheral surface 15 of the inner tube 12, which constitutes part of the frictional force, may decrease over time due to loosening of the screw, etc. However, in order to cover up insufficient fixing and holding, for example when supporting a heavy object such as a stand, tightening multiple fastening screws individually takes time and effort, is inconvenient and impractical, and when trying to ensure the tightening fixing force, the tip of the male threaded portion may leave a mark or dent on the outer peripheral surface of one end of the inner tube, which may cause deterioration from both functional and aesthetic standpoints. In particular, in the case of inner and outer pipes made of resin, the tightening and fixing force is too strong, which may cause the outer circumferential surface of the inner pipe to crack or break.

[0005] Thirdly, for example, when the inner and outer tubes oriented in the vertical direction are themselves relatively long and need to support a heavy object, and the thickness of the tubes, particularly the outer tube, is accordingly thick, the male thread portion must penetrate the thickness of the outer tube to reach the outer peripheral surface 15 of the inner tube 12, which naturally requires a longer male thread portion, and therefore requires more time and effort to screw in, making it inconvenient and impractical. As described above, even if the fitting length between the inner and outer tubes can be adjusted by screwing the fastening screw into the outer tube from the outer surface side of the outer tube and fixing the tip portion to the outer peripheral surface 15 of the inner tube 12, this can only be said to be useful for very limited applications, including the practicality of adjusting the fitting length between the inner and outer tubes itself. DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] In view of the above technical problems, an object of the present invention is to provide a length adjustment jig that has a simple structure and can adjust the overall length of the inner tube and the outer tube with a simple operation. In view of the above technical problems, the object of the present invention is to provide a length adjustment jig that has a simple structure and can be easily operated to adjust the height position of a heavy object by adjusting the overall length of the inner tube and outer tube when a heavy object is supported at a predetermined height through the fitting structure of the inner tube and outer tube. In view of the above technical problems, an object of the present invention is to provide a length adjustment method that can versatility adjust the overall length of an inner tube and an outer tube for an existing fitting structure between an inner tube and an outer tube. [Means for solving the problem]

[0007] In order to achieve the above object, the length adjustment jig of the present invention comprises: A length adjustment jig interposed between an inner tube and an outer tube which are fitted together, A pair of through slits spaced apart from each other are provided on the outer circumferential surface of the outer tube, and a female screw portion is provided between the pair of through slits; a pressing portion that is positioned on the outer peripheral surface of the outer tube, passes through the pair of through slits, and comes into contact with the outer peripheral surface of the inner tube; a fastening screw portion capable of fastening the pressing portion against an outer circumferential surface of the inner tube, The fastening screw portion has a male screw portion that can be screwed into the female screw portion, After adjusting the fitting position of the inner tube relative to the outer tube, the male threaded portion is screwed into the female threaded portion by the tightening screw portion, without providing a pressing portion storage space that has an opening facing the inner surface of the outer tube and protrudes to the outside of the outer tube, and the pressing portion is passed through the pair of through slits to be pressed and fixed against the outer surface of the inner tube.

[0008] According to the length adjusting jig having the above-mentioned configuration, the fitting position of the inner tube with respect to the outer tube can be adjusted by adjusting the length of the fitting portion of the inner and outer tubes that are fitted together, using the female screw portion provided on the outer surface of each outer tube, at least one through hole within a predetermined range from the female screw portion, at least one pressing portion that passes through the through hole from the outer peripheral surface of the outer tube and contacts the outer peripheral surface of the inner tube, and a fastening screw portion that can press and fix the pressing portion against the outer peripheral surface of the inner tube. After adjusting the length, it is possible to have an opening facing the inner surface of the outer tube and to provide no storage space for the pressing portion that protrudes to the outside of the outer tube, and by rotating the fastening screw portion, the male threaded portion is screwed into the female threaded portion provided on the outer surface of the outer tube, and by screwing in the fastening screw portion, the pressing portion within a predetermined range from the female threaded portion is caused to pass through the through hole, and the tip surface is pressed and fixed in surface contact against the outer surface of the inner tube.With this simple structure and simple operation without requiring excessive fastening force, the overall length of the inner tube and outer tube can be adjusted so that it can be fixed and held.

[0009] In order to achieve the above object, the length adjustment jig of the present invention comprises: A length adjustment jig interposed between an inner tube and an outer tube which are fitted together, a tubular base portion having an outer circumferential surface with a pair of through slits spaced apart from each other and a female screw portion provided between the pair of through slits, the tubular base portion being attached and fixed to an outer circumferential surface of one end portion of the outer tube; a pressing portion positioned on an outer circumferential surface of the tubular base portion, passing through the pair of through slits, and contacting the outer circumferential surface of the inner tube; a fastening screw portion capable of fastening the pressing portion against an outer circumferential surface of the inner tube, The fastening screw portion has a male screw portion that can be screwed into the female screw portion, a pair of through slits that are provided between the male threaded portion and the female threaded portion, and a fastening screw portion that is ...

[0010] Further, a pressing body having a generally U-shaped vertical cross section is provided, the pressing body having a clearance hole portion penetrating in a thickness direction and two pressing portions extending in opposite directions from the clearance hole portion, It is preferable that the pressing body is positioned above the outer tube or the tubular base portion, and the male threaded portion passes through the clearance hole portion and is tightened against the female threaded portion, thereby making it possible to fix the outer tube or the tubular base portion to the inner tube via the pressing portion. Furthermore, the fastening screw portion has a shank portion and the male screw portion extending downward from a lower surface of the shank portion, The lower surface is formed with an annular surface surrounding the male thread portion, the pressing body has a protrusion on an upper surface thereof, and the clearance hole is provided in the protrusion, By screwing the male threaded portion into the female threaded portion, the lower surface of the shank portion and the upper surface of the protrusion of the pressing body come into contact, so that the fastening screw portion and the pressing body are integrally pressed and fixed against the inner tube and screwed into the outer tube.

[0011] Furthermore, it is preferable that a contact surface capable of contacting the outer circumferential surface of the outer tube or the tubular base portion is provided on the rear surface of the central portion of the pressing body. In addition, the pressing body has a central portion in which the clearance hole portion is provided, and each of the pair of pressing portions has a leg portion extending downward from a corresponding end portion of the central portion, and a pressing surface is provided at the lower end of the leg portion. In addition, it is preferable that the pressing body has a central portion in which the clearance hole portion is provided, and each of the pair of pressing portions has an inclined portion extending downward from the entire corresponding end portion of the central portion, and each of the pair of pressing portions extends from the entire lower end of the inclined portion and has a pressing surface provided on its lower surface. Furthermore, the fastening screw portion preferably has a head portion at the end of the shank portion opposite the end of the male screw portion, the head portion being capable of being held and rotated by fingers.

[0012] Furthermore, it is preferable that the tubular base portion is a hollow cylinder whose one end can be fitted onto one end of the outer tube, and that the inner tube is inserted into the other end with a predetermined clearance between the outer circumferential surface of the tubular base portion. In addition, the pair of through slits may be provided at a predetermined interval from each other in the circumferential direction of the inner and outer tubes and may extend in the longitudinal direction of the inner and outer tubes. The length adjusting jig is preferably made of resin.

[0013] Furthermore, the length adjustment jig is preferably used for a clothesline pole for adjusting the overall length of the inner and outer tubes, or for the suction tube of a vacuum cleaner. Furthermore, the pair of through slits are arranged at a predetermined interval from each other in the longitudinal direction of the inner and outer tubes, and extend circumferentially of the inner and outer tubes, respectively, the inner and outer tubes are oriented vertically, and either the inner or outer tube can support a heavy object at a predetermined height. In addition, the length adjustment jig is preferably made of metal. The length adjustment jig may be used in a stand for supporting daily necessities at a predetermined height, or in a vehicle for supporting a saddle at a predetermined height.

[0014] In order to achieve the above object, the method for adjusting the length of the inner and outer tubes of the present invention comprises the steps of: In existing inner and outer pipes that fit together, drilling a pair of through slits spaced apart from each other and a female screw portion between the pair of through slits on an outer circumferential surface of one end of the outer tube; a step of preparing a pressing portion that is positioned on the outer peripheral surface of the outer tube, that passes through the pair of through slits and comes into contact with the outer peripheral surface of the inner tube, and a fastening screw portion that has a male screw portion that can be screwed into the female screw portion and can press and fix the pressing portion against the outer peripheral surface of the inner tube, After adjusting the fitting position of the inner tube relative to the outer tube, the male threaded portion is screwed into the female threaded portion using the tightening screw portion, while the pressing portion is passed through the pair of through slits and pressed and fixed against the outer peripheral surface of the inner tube. BEST MODE FOR CARRYING OUT THEINVENTION

[0015] A first embodiment of the length adjusting jig 10 of the present invention will be described in detail below with reference to the drawings. As shown in Figures 1 to 6, the length adjustment jig 10 is generally composed of a pressing body 22 interposed between an inner tube 12 and an outer tube 14 which fit together, and having a pressing surface 54 which can be pressed against the outer peripheral surface 15 of the inner tube 12, and a tightening screw portion 24 which can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The length, thickness and cross-sectional shape of each of the inner tube 12 and the outer tube 14 can be selected according to the application, and as will be described later, the fitting length between the inner tube 12 and the outer tube 14 is adjusted so that the overall length of the inner tube 12 and the outer tube 14 can be adjusted.

[0016] For example, each of the inner tube 12 and the outer tube 14 is hollow cylindrical, and the outer tube 14 is fitted onto the inner tube 12 by inserting the inner surface 17 of the outer tube 14 from one end opening into one end opening of the outer surface 15 of the inner tube 12. When the outer tube 14 is fitted into the inner tube 12, a slight clearance may be provided between the inner peripheral surface 17 of the outer tube 14 and the outer peripheral surface 15 of the inner tube 12, as long as the outer tube 14 is fixed and held in the longitudinal direction relative to the inner tube 12 by the fastening screw portion 24 via the pressing body 22, as will be described later. The slight clearance is, for example, 0.05 mm to 0.1 mm. A pair of through slits 18 are provided on the outer peripheral surface 16 of the outer tube 14, spaced apart by a distance D, and a female thread portion 20 is provided between the pair of through slits 18. The distance D between the pair of through slits 18 may be selected according to the application of the length adjustment jig 10, as will be described later.

[0017] The pair of through slits 18 are provided so as to extend in the longitudinal direction of the inner and outer tubes 12, 14 at a predetermined interval from each other. More specifically, each of the pair of through slits 18 is an elongated opening, and the width of the opening need only be such that the pressing portion 22 can penetrate in the thickness direction. As will be described later, since the pressing body is fastened and fixed to the outer tube 14 via the fastening screw portion 24, there is no need for the pressing portion 22 to penetrate in a tight fit manner into the pair of through slits 18 provided on the outer peripheral surface 16 of the outer tube 14.

[0018] The pressing portion 22 is positioned on the outer circumferential surface 16 of the outer tube 14 and passes through a pair of through slits 18 so as to come into contact with the outer circumferential surface 15 of the inner tube 12 . More specifically, the male thread portion 26 of the tightening screw portion 24 forms a pressing body 34 having an approximately U-shaped longitudinal section, which is provided with a clearance hole portion 32 penetrating in the thickness direction and two pressing portions 22 extending in opposite directions from the clearance hole portion 32. The pressing body 34 has a central portion 48 in which the clearance hole portion 32 is provided, and each of the pair of pressing portions 22 has an inclined portion 56 extending downward from the entire corresponding end portion of the central portion 48, and each of the pair of pressing portions 22 extends from the entire lower end of the inclined portion 56, and a pressing surface 54 is provided on the lower surface 38. Each of the pressing surfaces 54, which is the tip surface of the pressing portion 22, is shaped to follow the outer circumferential surface 15 of the inner tube 12 so as to be in surface contact with the outer circumferential surface 15 of the inner tube 12. For example, if the outer circumferential surface 15 of the inner tube 12 is the outer surface of a cylinder, the pressing surface 54 has a cross section in the shape of an arc of that diameter. In this case, unlike the fastening screw portion 24, the pressing body 34 itself does not need to be rotated toward the outer circumferential surface 15 of the inner tube 12, so that it is possible to press the pressing surface 54 against the outer circumferential surface 15 of the inner tube 12 in a direction in which the arc-shaped cross section matches the outer circumferential surface 15 of the inner tube 12.

[0019] The pressing body 34 has a protrusion 42 on an upper surface 44, and the protrusion 42 is provided with a clearance hole 32. By screwing the male threaded portion 26 into the female threaded portion 20, the lower surface 38 of the shank portion 36 and the upper surface 44 of the protrusion portion 42 of the pressing body 34 come into contact, and the fastening screw portion 24 and the pressing body 34 are integrally pressed and fixed against the inner tube 12 and screwed into the outer tube 14. The pressing body 34 is positioned above the outer tube 14, and the male threaded portion 26 passes through the clearance hole portion 32 and is tightened against the female threaded portion 20, thereby making it possible to fix the outer tube 14 to the inner tube 12 via the pressing portion 22.

[0020] A contact surface 46 capable of contacting the outer circumferential surface 16 of the outer tube 14 is provided on the rear surface of the central portion 48 of the pressing body 34 . More specifically, a flat abutment surface 46 is provided around the lower end opening of the clearance hole portion 32, and the male threaded portion 26 is screwed into the female threaded portion 20 of the outer peripheral surface 16 of the outer tube 14 by the fastening screw portion 24 until the lower surface of the shank portion 36 abuts against the annular surface of the pressing body 34, so that the pressing surface 54 is tightened and fixed to the outer peripheral surface 15 of the inner tube 12 with the abutment surface 46 abutting against the outer peripheral surface 16 of the outer tube 14. As a result, the inner and outer tubes 12, 14 are fixed and held at a predetermined fitting length via the fastening screw portion 24 and the pressing body 34.

[0021] The fastening screw portion 24 is configured to be able to press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 has a shank portion 36 and a male threaded portion 26 extending downward from an underside 38 of the shank portion 36, the male threaded portion 26 being able to screw into the female threaded portion 20, and an annular surface 40 surrounding the male threaded portion 26 is formed on the underside 38. After adjusting the fitting position of the inner tube 12 relative to the outer tube 14, the male threaded portion 26 is screwed into the female threaded portion 20 using the tightening screw portion 24, while the pressing portion 22 is passed through a pair of through slits 18 and pressed and fixed against the outer peripheral surface 15 of the inner tube 12. The fastening screw portion 24 has a head portion 58 that can be gripped and rotated with fingers at the end opposite the male threaded portion side end of the shank portion 36. The diameter of the head portion 58 is preferably as large as possible so that it can be gripped with little force with the fingers and rotated, and from the viewpoint of preventing slippage, it may be provided with a plurality of shallow grooves spaced apart in the circumferential direction.

[0022] Regarding the use of the length adjustment jig 10, a pair of through slits 18 are provided at a predetermined interval from each other in the longitudinal direction of the inner and outer tubes 12, 14, respectively extending in the circumferential direction of the inner and outer tubes 12, 14, the inner and outer tubes 12, 14 are oriented vertically, and either the inner or outer tube 12, 14 supports a heavy object at a predetermined height. In particular, when using the length adjustment jig 10 to adjust the fitting length of the inner and outer tubes 12, 14 extending in the vertical direction to fix and hold a heavy object at a predetermined height, from the standpoint of supporting the weight of the heavy object by the frictional force between the pressing surface of the pressing portion 22 and the outer peripheral surface 15 of the inner tube 12, the greater the resistance of the pressing surface of the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, i.e., the tightening force by the fastening screw portion 24, the more preferable it is.For this reason, strength sufficient to withstand large tightening forces is required, so that the pressing portion 22 and fastening screw portion 24, as well as the inner and outer tubes 12, 14 that constitute the length adjustment jig 10, are preferably made of metal. The length adjustment jig 10 may be used in a stand that supports everyday items at a predetermined height, or in a vehicle that supports a saddle at a predetermined height. As shown in Figure 10, a pair of inner and outer tubes 12, 14, which fit together using a length adjustment jig, are provided so as to extend parallel to each other at a specified distance and diagonally upwards, and the lower parts of the outer tubes 14 of the pair of inner and outer tubes 12, 14 are connected by members Y3 and Y5, and a steel pan (musical instrument) to be supported at a specified height is placed between the upper parts of the inner tubes 12 of the pair of inner and outer tubes 12, 14, and members Y1 and Y2 are connected to the lower parts of each of the outer tubes 14 of the pair of inner and outer tubes 12, 14 so as to jam and support each of the pair of inner and outer tubes 12, 14 extending diagonally upwards, and the steel pan (musical instrument) is supported at four points. In this case, the length adjustment jig is used to adjust the fitting lengths of the inner and outer tubes 12, 14 so that they are the same, thereby allowing the steelpan (musical instrument) to be supported and fixed horizontally at the desired height. Furthermore, as shown in FIG. 11, when used as a microphone stand, the entire outer tube fits onto the outer peripheral surface of a diagonal bar which fixes the microphone to one end and adjusts its height, and by using a length adjustment jig 10 for this fitting position, it is possible to easily adjust not only the height but also the lateral position of the microphone.

[0023] As a variant, the length adjustment jig 10 may be made of resin from the viewpoint of light weight, and in particular, even if a pair of slit portions and an opening for the female screw portion 20 are provided, it is preferable to ensure a certain thickness from the viewpoint of ensuring the strength around them. In this case, the pair of through slits 18 are preferably provided so as to extend in the circumferential direction of the inner and outer pipes 12, 14 at a predetermined interval from each other in the circumferential direction of the inner and outer pipes 12, 14, respectively. The length adjustment jig 10 is used, for example, in a clothesline pole for adjusting the overall length of the inner and outer tubes 12, 14. In the case of a clothesline pole, the overall length of the clothesline pole consisting of the inner and outer tubes 12, 14 can be adjusted according to the number of laundry to be hung by adjusting the fitting length of the inner and outer tubes 12, 14 using the length adjustment jig 10.

[0024] According to the length adjusting jig having the above-mentioned configuration, the female thread portion 20, at least one through slit 18 within a predetermined range from the female thread portion 20, at least one pressing portion 22 penetrating the through slit 18 from the outer peripheral surface 16 of the outer tube 14 and contacting the outer peripheral surface 15 of the inner tube 12, and the fastening screw portion 24 capable of pressing and fixing the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12 are respectively provided on the outer peripheral surface 16 of the outer tube 14. After adjusting the fitting position of the inner tube 12 relative to the outer tube 14, it is possible to adjust the fitting position of the inner tube 12 relative to the outer tube 14 by rotating the fastening screw portion 24, without providing a space to accommodate the pressing portion, which has an opening facing the inner surface 17 of the outer tube 14 and protrudes to the outside of the outer tube 14, and then by screwing in the fastening screw portion, the pressing portion 22 within a predetermined range from the female thread portion 20 is caused to penetrate the through slit 18, and the tip surface is pressed and fixed in a surface contact manner against the outer surface 15 of the inner tube 12.This simple structure makes it possible to adjust the overall length of the inner tube 12 and the outer tube 14 so that it can be fixed and held in place by simple operation without requiring excessive fastening force. In the above description, the inner and outer tubes 12, 14 have a circular cross section, and the pressing surface 54 of the pressing body 34 has an arc-shaped cross section the same as the diameter of the inner tube 12 so that it adheres to the outer surface of the inner tube 12. If the diameters of the inner and outer tubes 12, 14 are different, a pressing body 34 having a pressing surface 54 corresponding to the diameter is prepared. However, this is not limited to the above. If the inner and outer tubes 12, 14 have an equal or equal planar rectangular cross section, the pressing surface 54 of the pressing body 34 may have a planar cross section so that it adheres to the outer surface of the inner tube 12. This method can be used for inner and outer tubes 12, 14 having various rectangular cross sections.

[0025] A method for adjusting the length of the inner and outer tubes 12, 14, particularly in the case of existing inner and outer tubes 12, 14 that are fitted together, will be described below. A step of drilling a pair of spaced apart through slits 18 and a female screw portion 20 between the pair of through slits 18 on an outer peripheral surface 16 at one end of the outer tube 14; a step of preparing a pressing portion 22 which 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, and a fastening screw portion 24 which has a male screw portion 26 which can be screwed into the female screw portion 20 and can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12; After adjusting the fitting position of the inner tube 12 relative to the outer tube 14, the male threaded portion 26 is screwed into the female threaded portion 20 using the tightening screw portion 24, while the pressing portion 22 is passed through a pair of through slits 18 and pressed and fixed against the outer peripheral surface 15 of the inner tube 12. According to the above method, by drilling a hole in one end of the outer tube 14 in the existing inner and outer tubes 12, 14, it is possible to universally adjust the overall length of the inner tube 12 and the outer tube 14 for the existing fitting structure between the inner tube 12 and the outer tube 14.

[0026] The second embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic parts of this embodiment will be described in detail with reference to Figs. 7 to 9. The second embodiment of the present invention is characterized in that it is a length adjustment jig 10 interposed between the inner tube 12 and outer tube 14 which are fitted to each other, and has a pressing portion 22 which passes through a pair of through slits 18 and comes into contact with the outer peripheral surface 15 of the inner tube 12, and a tightening screw portion 24 which can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, and the tightening screw portion 24 has a male thread portion 26 which can be screwed into the female thread portion 20, which is common to the first embodiment, but while in the first embodiment a pair of through slits 18 was provided on the outer peripheral surface 16 of the outer tube 14 and a female thread portion 20 was provided between the pair of through slits 18, in this embodiment a tubular base portion 30 which is attached and fixed to one end of the outer tube 14 is provided, and a pair of through slits 18 spaced apart from each other and a female thread portion 20 provided between the pair of through slits 18 are provided on the outer peripheral surface 16 of the tubular base portion 30.

[0027] More specifically, the tubular base portion 30 is a hollow cylinder whose one end can be fitted onto one end 28 of the outer tube 14, and the inner tube 12 is inserted into the other end with a predetermined clearance between the outer peripheral surface 16 of the tubular base portion 30 and the inner tube 12. According to the above configuration, after adjusting the fitting position of the inner tube 12 relative to the tubular base portion 30, the male threaded portion 26 is screwed into the female threaded portion 20 using the tightening screw portion 24, while the pressing portion 22 is passed through a pair of through slits 18 and pressed and fixed against the outer peripheral surface 15 of the inner tube 12. The tubular base portion 30 may be attached and fixed to one end of the outer tube 14 by, for example, screws or by interference fit, so long as it is firmly fixed to the outer tube 14 . For existing inner and outer tubes 12, 14, a pressing portion 22 and a fastening screw portion 24 capable of pressing and fixing the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, as well as a tubular base portion 30 having a pair of through slits 18 and a female screw portion 20 between the pair of through slits 18 on the outer peripheral surface 16, make it possible to adjust the fitting length of the inner and outer tubes 12, 14.

[0028] The third embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and the description thereof will be omitted. Below, the characteristic parts of this embodiment will be described in detail with reference to FIG. The third embodiment of the present invention is characterized in that a pressing body 34 is provided on the outer tube 14, and is a length adjustment jig 10 interposed between the inner tube 12 and outer tube 14 which are fitted together, and has a pressing portion 22 which passes through a through slit 18 and comes into contact with the outer peripheral surface 15 of the inner tube 12, and a tightening screw portion 24 which can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, and the tightening screw portion 24 has a male screw portion 26 which can be screwed into the female screw portion 20, which is common to the first embodiment. However, in the first embodiment, a pair of through slits 18 were provided in the outer peripheral surface 16 of the outer tube 14, and accordingly the pressing body 34 had a clearance hole portion 32 in the center and a pair of pressing surfaces 54, but in this embodiment, a single through slit 18 is provided, and accordingly a single pressing body 34 is provided.

[0029] More specifically, a solid pressing body 34 that can be fitted into the single through slit 18 is provided, and the position of the outer circumferential surface 16 of the outer tube 14 of the single through slit 18 is within the range of the diameter from the female thread portion 20 to the head portion 58 of the fastening screw portion 24, so that when the head portion 58 of the fastening screw portion 24 is rotated by hand to screw the male thread portion 26 into the female thread portion 20 toward the outer circumferential surface 15 of the inner tube 12, the lower surface of the head portion 58 comes into contact with the upper surface 40 of the pressing body 34, as in the first embodiment, and the pressing body 34 can be pressed toward the outer circumferential surface 15 of the inner tube 12. Also as in the first embodiment, the pressing surface 54 of the pressing body 34 is shaped to fit along the outer circumferential surface 15 of the inner tube 12 so as to be in surface contact with the outer circumferential surface 15 of the inner tube 12. Compared to the first embodiment, this embodiment is more suitable for use in adjusting the overall length of the inner and outer tubes 12, 14, such as a clothesline pole, than for applying the length adjustment jig 10 to the inner and outer tubes 12, 14 in the vertical direction to support a heavy object at a predetermined height.

[0030] Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and changes without departing from the scope of the present invention. For example, in the first embodiment, from the viewpoint of protecting the outer surface of the inner tube 12, it was explained that the tip of the male thread portion 26 of the fastening screw portion 24 penetrates the outer tube 14 or the female thread portion 20 of the tubular base portion so as not to come into contact with the outer surface of the inner tube 12. However, this is not limited to this, and when the inner and outer tubes 12, 14 are made of metal, in addition to the pressing surface 54 of the pressing body 34, the tip of the male thread portion 26 of the fastening screw portion 24 comes into contact with the outer surface of the inner tube 12, thereby making it possible to more firmly fix the position of the outer tube 14 relative to the inner tube 12, which is effective in supporting a heavy object at a predetermined height by either the inner or outer tube 12, 14 with the inner and outer tubes 12, 14 oriented vertically. For example, in the third embodiment, a single through slit 18 is provided on the outer peripheral surface 16 of the outer tube 14 within a predetermined distance from the female thread portion 20, but this is not limited to this. As in the second embodiment, a tubular base portion 30 may be provided that is attached and fixed to one end of the outer tube 14, and a single through slit 18 may be provided on the outer peripheral surface 16 of the tubular base portion 30 within a predetermined distance from the female thread portion 20.

[0031] For example, in the first embodiment, it was described that the fastening screw portion 16 has a male thread portion 26 and a head portion 58 that is gripped with the fingers and rotated, while the female thread portion 20 is provided on the outer peripheral surface 16 of the outer tube 14. However, without being limited to this, the male thread portion 26 may be provided on the outer peripheral surface 16 of the outer tube 14, and the fastening screw portion 16 may be in the form of a nut that screws onto the male thread portion 26. For example, in the first embodiment, a single length adjustment jig is provided at a predetermined position on the inner and outer tubes 12, 14, but this is not limited to this. For example, when a pair of through slits 18 are provided at intervals in the longitudinal direction of the inner and outer tubes 14, multiple sets of such pairs of through slits 18 may be provided in the circumferential direction of the inner and outer tubes 12, 14, and multiple pressing portions 22 may be provided accordingly. [Brief description of the drawings]

[0032] [Figure 1] FIG. 2 is a partial perspective view of an outer tube of the length adjustment jig according to the first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of a fastening screw portion of the length adjustment jig according to the first embodiment of the present invention. [Diagram 3] FIG. 2 is a perspective view of a pressing body of the length adjustment jig according to the first embodiment of the present invention. [Figure 4] FIG. 2 is a perspective view of a pressing body of the length adjustment jig according to the first embodiment of the present invention. [Diagram 5] 1 is a cross-sectional view of a length adjustment jig according to a first embodiment of the present invention. FIG. [Figure 6] 1 is a vertical sectional view of a length adjustment jig according to a first embodiment of the present invention. [Figure 7] FIG. 11 is a perspective view of a length adjustment jig according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a perspective view of a length adjustment jig according to a second embodiment of the present invention. [Figure 9] 7 is a view similar to FIG. 6 showing a length adjusting jig according to a second embodiment of the present invention. [Figure 10] 1 is a perspective view of a length adjustment jig according to an embodiment of the present invention applied to a musical instrument stand; [Figure 11] 1 is a perspective view of a length adjustment jig according to an embodiment of the present invention applied to a microphone stand; [Figure 12] 1, but showing a length adjusting jig according to a third embodiment of the present invention. FIG. [Explanation of symbols]

[0033] D Distance between a pair of slits 10 Length adjustment jig 12 Inner tube 14 Outer tube 15 Outer surface 16 Outer surface 17 Inner surface 18 Through slit 20 Female thread 22 Pressing part 24 Fastening screw 26 Male thread 28 One end 30 Tubular base 32 Fool's Hole 34 Pushing body 36 Shank 38 Bottom side 40 Annular Surface 42 Protrusion 44 Top side 46 Contact surface 48 Central part 50 End 54 Pressing surface 56 Slope 58 Head

Claims

1. A length adjustment jig interposed between an inner tube and an outer tube which are fitted together, The outer surface of the outer tube is provided with a female thread portion and at least a through hole within a predetermined range from the female thread portion, At least one pressing portion that passes through the through hole from the outer peripheral surface of the outer tube and contacts the outer peripheral surface of the inner tube; a fastening screw portion capable of fastening the pressing portion against an outer circumferential surface of the inner tube, a tip surface of the pressing portion is shaped to conform to the outer circumferential surface of the inner tube so as to be in surface contact with the outer circumferential surface of the inner tube; The fastening screw portion has a male screw portion that can be screwed into the female screw portion, a fastening screw portion for fastening the male threaded portion to the female threaded portion, the male threaded portion being threadedly engaged with the female threaded portion by the fastening screw portion, the fastening screw portion being caused to pass through the through hole, and the tip surface being pressed and fixed in a surface contact manner against the outer peripheral surface of the inner tube.

2. A length adjustment jig interposed between an inner tube and an outer tube which are fitted together, a tubular base portion having an outer circumferential surface including a female screw portion and at least a through hole within a predetermined range from the female screw portion, the tubular base portion being attached and fixed to an outer circumferential surface of one end portion of the outer tube; At least one pressing portion that passes through the through hole from the outer circumferential surface of the tubular base portion and abuts against the outer circumferential surface of the inner tube; a fastening screw portion capable of fastening the pressing portion against an outer circumferential surface of the inner tube, a tip surface of the pressing portion is shaped to conform to the outer circumferential surface of the inner tube so as to be in surface contact with the outer circumferential surface of the inner tube; The fastening screw portion has a male screw portion that can be screwed into the female screw portion, a tightening screw portion for threading the male threaded portion into the female threaded portion, while the pressing portion is caused to penetrate the through hole, and the tip surface is pressed and fixed in a surface contact manner against the outer peripheral surface of the inner tube.

3. The through holes are provided at intervals from each other, and the pressing portion is provided at a plurality of positions corresponding to the through holes, The fastening screw portion has a flange-shaped head portion fixed to one end of the male screw portion and manually rotatable around the extension direction of the male screw portion, 3. The length adjustment jig according to claim 1 or claim 2, wherein the flange-shaped head portion has a size that enables it to be pressed against the outer peripheral surface of the inner tube by screwing the tightening screw portion into the corresponding through holes while simultaneously pressing the upper portions of each of the pressing portions with its underside.

4. The length adjustment jig described in claim 3, wherein the pressing portion is solid and has an outer peripheral side surface that fits into the inner peripheral surface of each of the plurality of through holes, a lower end surface that can be pressed against the outer peripheral surface of the inner tube, and an upper end surface opposite the lower end surface, and the tip surface is constituted by the lower end surface.

5. The plurality of through holes are a pair of through slits spaced apart from each other, and the male screw portion is provided between the pair of through slits, a pressing body having a generally U-shaped cross section, the pressing body having a clearance hole portion penetrating in a thickness direction and two pressing portions extending in opposite directions from the clearance hole portion, The length adjustment jig described in claim 3, characterized in that the pressing body is located above the outer tube or the tubular base portion, and the male threaded portion passes through the undercut portion and is tightened against the female threaded portion, thereby fixing the outer tube or the tubular base portion to the inner tube via the pressing portion.

6. The fastening screw portion has a shank portion and the male screw portion extending downward from a lower surface of the shank portion, The lower surface is formed with an annular surface surrounding the male thread portion, the pressing body has a protrusion on an upper surface thereof, and the clearance hole is provided in the protrusion, 6. The length adjustment jig described in claim 5, wherein by screwing the male threaded portion into the female threaded portion, the lower surface of the shank portion and the upper surface of the protrusion of the pressing body come into contact with each other, so that the fastening screw portion and the pressing body are integrally pressed and fixed against the inner tube and screwed into the outer tube.

7. The length adjustment jig according to claim 6 , wherein a contact surface capable of contacting an outer circumferential surface of the outer tube or the tubular base portion is provided on a rear surface of a central portion of the pressing body.

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

9. 7. The length adjustment jig according to claim 6, wherein the pressing body has a central portion in which the clearance hole portion is provided, and each of the pair of pressing portions has an inclined portion extending downward from the entire corresponding end portion of the central portion, and each of the pair of pressing portions extends from the entire lower end of the inclined portion and has a pressing surface provided on its lower surface.

10. 7. The length adjusting jig according to claim 6, wherein the tightening screw portion has a head portion that can be held and turned by fingers at an end of the shank portion opposite to the end of the male screw portion.

11. The length adjustment jig described in claim 2, wherein the tubular base portion is a hollow cylinder whose one end can be fitted onto one end of the outer tube, and the inner tube is inserted into the other end with a predetermined clearance between the outer peripheral surface of the tubular base portion.

12. A length adjustment jig as described in claim 1 or claim 2, wherein the length adjustment jig is made of resin, and the pair of through slits are arranged at a predetermined interval from each other in the circumferential direction of the inner and outer tubes, and extend in the longitudinal direction of the inner and outer tubes, respectively.

13. The length adjustment jig is made of metal, the pair of through slits are arranged at a predetermined interval from each other in the longitudinal direction of the inner and outer tubes and extend circumferentially of the inner and outer tubes, the inner and outer tubes are oriented vertically, and either the inner or outer tube supports a heavy object at a predetermined height.A length adjustment jig as described in claim 1 or claim 2.

14. In existing inner and outer pipes that fit together, the step of drilling at least one through hole and a female screw portion within a predetermined range of the at least one through hole in the outer peripheral surface of one end side of the outer tube, and preparing a pressing portion that is positioned on the outer peripheral surface of the outer tube, passes through the through hole and abuts against the outer peripheral surface of the inner tube, and a tightening screw portion that has a male screw portion that can be screwed into the female screw portion and can press and fix the pressing portion against the outer peripheral surface of the inner tube, A method for adjusting the length of inner and outer tubes, characterized in that after adjusting the fitting position of the inner tube relative to the outer tube, the male threaded portion is screwed into the female threaded portion using the tightening screw portion, while the pressing portion is passed through the through hole to press and fix it against the outer peripheral surface of the inner tube.

15. The at least one through hole is a pair of through slits spaced apart from each other, the pressing portion is provided in a pair accordingly, and the fastening screw portion has a head portion whose lower surface can abut against the upper surface of each of the pressing portions, a tip end surface of each of the pressing portions is shaped to conform to an outer circumferential surface of the inner tube so as to be in surface contact with the outer circumferential surface of the inner tube; The length adjustment method for the inner and outer tubes described in claim 14, wherein the step of pressing and fixing to the outer peripheral surface of the inner tube includes the tightening screw portion screwing the male threaded portion into the female threaded portion, while the lower surface of the head portion presses each of the upper surfaces toward the outer peripheral surface of the inner tube, and pressing and fixing each of the tip surfaces to the outer peripheral surface of the inner tube in a surface contact manner.

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