Method of manufacturing integral structure of inner / outer pipe and inclination angle adjustment jig

Abstract

To provide a method of manufacturing an integral structure of inner / outer pipes 12, 14 comprising a fixation support jig capable of tight supporting with only hand force.SOLUTION: A manufacturing method includes: a stage of performing machine processing or 3D printer molding or lost wax processing for a pair of through slits and a female screw part on an outer surface corresponding to a fitting part of an outer pipe 14 with respect to a solid or hollow inner pipe 12 and the hollow outer pipe 14 which are fitted to each other; and a stage of preparing a channel-sectioned press part with a clearance hole which can penetrate through the pair of through slits from outside an outer surface and press an outer peripheral surface of the inner pipe 12 in surface contact at two places, and a fastening screw part which comprises a female screw part capable of threadedly engaging the female screw part and a torque imparting grip, a diameter of the torque imparting grip being selected according to a supporting load so as to enable tight supporting with only hand force.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing an integrated structure of inner and outer tubes, and an inclination angle adjustment jig, and more specifically, to a method for manufacturing an integrated structure of inner and outer tubes equipped with a fixed support jig that can be firmly supported by hand alone, and an inclination angle adjustment jig that has a simple structure and can adjust the predetermined inclination angle direction of a heavy object by adjusting the fitting position of the inner tube and the outer tube with easy operation without requiring excessive tightening force. [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 threaded portion must penetrate the thickness of the outer tube to reach the outer circumferential surface of the inner tube, which naturally requires a longer male threaded 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 of the inner tube, 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.

[0006] In this regard, a length adjustment jig for inner and outer tube components is known in which a pair of protruding flanges facing each other in the longitudinal direction of the outer tube are provided on the outer tube, and the clearance between the pair of protruding flanges is narrowed by tightening the threaded portions against the female threaded portions provided on each protruding flange, thereby pressing the inner surface of the outer tube against the outer surface of the inner tube. With this type of length adjustment jig for inner and outer tube components, the inner surface of the outer tube is pressed against the outer surface of the inner tube without the tip of the threaded portion coming into contact with the outer surface of the inner tube, but it is difficult to obtain sufficient tightening force from the threaded portion. More specifically, the screw portion has a head portion and a male screw portion extending from the head portion, and a tightening force is applied by turning the head portion with fingers, but since the head portion is provided near the outer surface of the outer tube, it is difficult to expand the diameter, and it is difficult to apply force because it is turned by pinching it with fingers rather than gripping it with a hand. By providing a long shank portion to the screw portion, it is possible to expand the diameter of the head portion away from the outer surface of the outer tube, but this looks bad in appearance and is not preferable in terms of design.

[0007] Furthermore, a length adjustment jig for the inner and outer tube members is known in which, similar to the above, a screw having a male thread is screwed into the female thread of the outer tube to adjust the length of the inner and outer tube members, but in which a protrusion that protrudes outward is provided on the outer tube, a spacer is placed in the internal space formed by the protrusion, and the spacer is fixed to the outer peripheral surface of the inner tube by the tightening force of the screw via the spacer. With this type of length adjustment jig for the inner and outer tube components, the tip of the threaded portion does not come into direct contact with the outer peripheral surface of the inner tube, but rather the inner peripheral surface of the outer tube is indirectly pressed against the outer peripheral surface of the inner tube. However, as described above, in order to provide the outer tube with a protrusion that protrudes outward, this cannot be done by lathe processing, so a processing method such as lost wax casting is required, and this results in an unattractive appearance and is not desirable from the standpoint of design.

[0008] The above points are technical issues that apply not only to length adjustment jigs for inner and outer pipe fitting members and weight support jigs using inner and outer pipe fitting members, but also to tilt angle adjustment jigs that use inner and outer pipe fitting members to rotatably connect the inner and outer pipes via a pivot and adjust the relative tilt angle by adjusting the fitting position of the inner and outer pipes. DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0009] In view of the above technical problems, an object of the present invention is to provide a method for manufacturing an integral structure of inner and outer pipes, which is provided with a fixing support jig that can be firmly supported by hand alone. In view of the above technical problems, an object of the present invention is to provide a method for manufacturing an integrated structure of inner and outer tubes, which has a simple structure and is easy to operate, and allows the overall length of the inner and outer tubes to be adjusted. In view of the above technical problems, the object of the present invention is to provide a manufacturing method for an integrated structure of inner and outer tubes which, when supporting a heavy object at a predetermined height through a fitting structure between the inner and outer tubes, enables the height position of the heavy object to be adjusted by adjusting the overall length of the inner and outer tubes with a simple structure and easy operation. In view of the above technical problems, the object of the present invention is to provide a manufacturing method for an integrated structure of inner and outer tubes, which enables the adjustment of the predetermined inclination angle of a heavy object by adjusting the fitting position of the inner tube and the outer tube with a simple structure and easy operation, when a heavy object is supported at a predetermined inclination angle by either the inner tube or the outer tube through the fitting structure between the inner tube and the outer tube. [Means for solving the problem]

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

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

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

[0013] According to the inclination angle adjustment jig having the above configuration, the second support bar is fitted into the tubular portion so as to be movable in the longitudinal direction of the tube, and the first support bar is connected to the tubular portion via a pivot and is rotatable about the pivot, the outer peripheral surface of the tubular portion is provided with a female screw portion and at least one through hole within a predetermined range from the female screw portion, and has at least one pressing portion that passes through the through hole from the outer peripheral surface of the tubular base portion and abuts against the outer peripheral surface of the second support bar, and a fastening screw portion that can press and fix the pressing portion against the outer peripheral surface of the second support bar, and the tip surface of the pressing portion is shaped to follow the outer peripheral surface of the second support bar so as to be in surface contact with the outer peripheral surface of the second support bar. The tightening screw portion has a male threaded portion that can be screwed into the female threaded portion, and the pressing portion has a clearance hole through which the male threaded portion can pass. Therefore, by moving the first support bar within the plane formed by both support bars so that the distance between the lower ends of both support bars changes, the upper end of the first support bar rotates around the pivot axis relative to the tubular portion while adjusting the fitting position of the tubular base portion relative to the second support bar. Then, the tightening screw portion screws the male threaded portion into the female threaded portion via the clearance hole, while the pressing portion passes through the through hole, and the tip surface is pressed and fixed in a surface contact manner against the outer peripheral surface of the second support bar. This makes it possible to adjust the inclination angle of the second support bar with respect to the contact surface with the ground by simple structure and easy operation without requiring excessive tightening force; for example, the inclination angle of the rectangular surface when a rectangular heavy object is supported by the second support bar.

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

[0015] In addition, the tilt angle adjuster according to claim 1 is provided as a pair so that the planes defined by both the support bars are parallel to each other, Each of the opposing edges of the rectangular plate-shaped weight is supported by the second support bar of each of the tilt angle adjustment devices, and is supported at four points by the lower ends of the first support bar and the second support bar of each of the tilt angle adjustment devices, It is also possible to provide a device for supporting and adjusting the inclination angle of a rectangular plate-shaped weight object, in which the inclination angle of the rectangular surface of the rectangular plate-shaped weight object is adjusted by adjusting the fitting position of each of the tubular base parts of the inclination angle adjustment devices relative to the corresponding second support bars, thereby adjusting the inclination angle of each of the corresponding second support bars of the inclination angle adjustment devices. BEST MODE FOR CARRYING OUT THEINVENTION

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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 tightening screw portion 24 has a head portion 58 that can be held and rotated by fingers at the end of the shank portion 36 opposite the end on the male thread side. The diameter of the head portion 58 is preferably as large as possible so that it can be held and rotated with little force by fingers, and from the viewpoint of preventing slippage, it may be provided with a plurality of shallow grooves spaced apart in the circumferential direction. In this sense, the head portion 58 constitutes a torque applying grip 132 that applies rotation around the extension direction of the male thread portion 26.

[0023] As shown in Figure 7, by screwing the male threaded portion 26 of the tightening screw portion 24 into the female threaded portion 20 of the outer tube 14, the pressing end face 54 is pressed against the outer peripheral surface of the inner tube 12 through the slit in the outer tube 14, and the inner tube 12 is moved until the diametrically opposite portion of the outer peripheral surface of the inner tube 12 contacts the inner peripheral surface of the outer tube 14. As a result, the inner tube 12 is firmly fixed and supported to the outer tube 14 by support at three points: the two pressing end faces 54 (C2) and one line contact (C1) extending in the longitudinal direction of the tube. In this case, 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 and fixed against the outer tube 14. In order to do this, the height H of the U-shape of the pressing portion 22 needs to be greater than the thickness of the outer tube 14 plus the clearance d between the inner and outer tubes 14. When a heavy object is fixed and supported at a predetermined height by the inner and outer tubes 14 extending in the vertical direction, the fixing and support effect is greater when the pair of pressing bodies 34 of the pressing section 22 are spaced apart in the extension direction of the inner and outer tubes 12, 14 than when they are spaced apart in the circumferential direction of the inner and outer tubes 12, 14. When the area of ​​the pressing end face 54 of the pressing body 34 is constant, the frictional force between the pressing end face 54 and the outer peripheral surface of the inner tube 12, which is based on the fastening force of the fastening screw section 24, is important for fixing and support, so it is preferable for the fastening force per unit area to be greater. In this sense, too, it is advisable to provide multiple pressing end faces 54.

[0024] 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.

[0025] 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. From the standpoint of lightweightness, when the inner and outer tubes are made of resin, particularly when the inner tube is made of resin, the pressing surface of the pressing body is pressed against the outer peripheral surface of the inner tube when tightened with the fastening screw, and if the area of ​​the pressing surface is too small, the pressing pressure against the outer peripheral surface of the inner tube will increase, and even if the thickness of the inner tube is sufficient to prevent deformation of the inner tube itself when supporting the longitudinal load of the inner and outer tubes, the outer peripheral surface of the inner tube may be scratched or, in some cases, dented. Therefore, taking into consideration the hardness of the resin of the inner tube, it is preferable to adjust the area of ​​the pressing surface of the pressing body so that the pressing pressure is within a range that prevents damage to the outer peripheral surface of the inner tube even when the fastening screw is tightened by hand.

[0026] As a further modified example, as shown in Fig. 23, one of the pair of through slits 18 may be a vertical slit along the longitudinal direction of the inner and outer tubes 12, 14, and the other may be a horizontal slit along the circumferential direction of the inner and outer tubes 12, 14, and the pressing body may accordingly be a vertical pressing surface that can penetrate the vertical slit, and the other may be a horizontal pressing surface that can penetrate the horizontal slit. This allows not only support against the load applied in the longitudinal direction of the inner and outer tubes 12, 14 by the vertical pressing surface, but also the horizontal pressing surface to be used for suppressing the relative rotation of one of the inner and outer tubes 12, 14 with respect to the other around the longitudinal direction of the inner and outer tubes 12, 14. Alternatively, a pair of pressing bodies may be provided, and the other may be provided on the diametrically opposite side of the position provided on one of the inner and outer tubes 12, 14 without increasing the pressing area of ​​each of them.

[0027] 33 and 34, a plurality of holes 128 are provided in the outer surface of the inner tube 12 at the assumed mating portion of the inner and outer tubes 12, 14, spaced apart from one another in the longitudinal direction of the tube, at circumferential positions facing the female threaded portion 22 of the outer tube 14. Each of the plurality of holes 128 has a size that allows the male threaded portion 26 of the fastening screw 24 to be inserted therein, and the male threaded portion 26 has a length sufficient to penetrate the thickness of the inner tube 12 when the fastening screw 24 is screwed into the female threaded portion 20 of the outer tube 14. As a result, when the inner and outer tubes 12, 14, which are fitted together, are fixed and supported, at the fitting position of the inner and outer tubes 12, 14, each of the pair of pressing bodies 34 of the U-shaped cross-section pressing portion 22 is passed through the corresponding through slits 18 of the outer tube 14, and the male threaded portion 26 of the fastening screw 24 is passed through the clearance hole 32 of the pressing portion 22 and screwed into the female threaded portion 20 provided on the surface of the outer tube 14.Since each of the pair of pressing surfaces 54 of the pressing portion 22, which are spaced apart in the longitudinal direction of the inner and outer tubes 12, 14, are shaped to conform to the outer peripheral surface 19 of the inner tube 12, they abut against the outer peripheral surface 19 of the inner tube 12 to fix and support the inner and outer tubes 12, 14, and the male threaded portion 26 of the fastening screw 24 is inserted into one of the multiple holes 128. The spacing between adjacent holes 128 is set so that when each pressing portion 22 is passed through the corresponding through slit 18 of the outer tube 14, the male threaded portion 26 of the fastening screw 24 is inserted into one of the multiple holes 128. For example, when using crutches, where a user adjusts the length of the cane so that the top of the cane rests against the armpit while holding the cane in the hand to support their weight, the crutches are required to have a load-bearing function as well as a length-adjustment function. In particular, if the load-bearing function is suddenly lost, the user may lose their balance and fall, which directly affects their physical safety, so it is necessary to ensure that the load-bearing function is completely reliable. In this embodiment, by selecting the hole 128 into which the male threaded portion 26 of the fastening screw 24 is inserted, the overall length of the inner and outer tubes 12, 14, i.e., the length of the wand, can be adjusted, and the inner and outer tubes 12, 14 are fixed and supported by the pressing portion 22, and the male threaded portion 26 of the fastening screw 24 is inserted and held in the hole 128.Therefore, even if the fixed support of the inner and outer tubes 12, 14 by the pressing portion is impaired due to an excessive load, it is possible to ensure a complete load supporting function.

[0028] 35 , a narrow groove 130 is provided in the outer surface of the inner tube 12 at the assumed fitting portion of the inner and outer tubes 12, 14 in the longitudinal direction of the tube at a circumferential position facing the female thread portion 22 of the outer tube 14. The width of the narrow groove 130 is large enough to allow the male thread portion 26 of the fastening screw 24 to be inserted therein, and the male thread portion 26 has a length sufficient to penetrate the thickness of the inner tube 12 when the fastening screw 24 is screwed into the female thread portion 20 of the outer tube 14. As a result, when the inner and outer tubes 12, 14, which are fitted together, are fixed and supported, at the fitting position of the inner and outer tubes 12, 14, each of the pair of pressing bodies 34 of the U-shaped cross-section pressing portion 22 is passed through the corresponding through slits 18 of the outer tube 14, and the male threaded portion 26 of the fastening screw 24 is passed through the clearance hole 32 of the pressing portion 22 and screwed into the female threaded portion 20 provided on the surface of the outer tube 14.Since each of the pair of pressing surfaces 54 of the pressing portion 22, which are spaced apart in the longitudinal direction of the inner and outer tubes 12, 14, are shaped to conform to the outer peripheral surface 19 of the inner tube 12, they abut against the outer peripheral surface 19 of the inner tube 12 to fix and support the inner and outer tubes 12, 14, and the male threaded portion 26 of the fastening screw 24 is inserted into the elongated groove 130. In this embodiment, the overall length of the inner and outer tubes 12, 14 is adjusted by adjusting the fitting positions of the inner and outer tubes 12, 14, and then the inner and outer tubes 12, 14 are fixed and supported by the pressing portion 22, and the male threaded portion 26 of the fastening screw 24 is inserted and held in the elongated groove 130. Therefore, when a load that would cause relative rotation around the longitudinal direction of the tubes is applied between the inner and outer tubes 12, 14, it is possible to prevent the occurrence of such relative rotation. From this viewpoint, the depth of the elongated groove 130 may be determined by cutting the outer circumferential surface 16 of the outer tube 14 .

[0029] A further modification is shown in Figures 38 to 40. When loosening the fixed support provided by the fastening screw 24 at the mating portion of the inner and outer tubes 12, 14, it is necessary to reverse the fastening screw 24 to release the contact of the pressing surface 54 of the pressing body 34 with the outer surface of the inner tube 12. However, if the fastening screw 24 is loosened too much, the pressing portion 22 of the pressing portion may come completely out of the corresponding through slit 18, causing the pressing portion to fall off the inner and outer tubes 12, 14, and in some cases, the pressing portion, which is a small part, may even go missing. In this case, as shown in Figure 38, the pressing portion 22 having a U-shaped side cross-section has a V-shaped side cross-section that widens from the annular surface 40 toward the pressing surface 54, while the pair of through slits 18 are made into an elongated rectangular parallelepiped shape. Even if the fastening screw 24 is loosened too much and the pressing portion 22 of the pressing portion comes completely out of the corresponding through slit 18, the pressing portion is engaged and held in the pair of through slits 18, thereby effectively preventing it from falling off. The degree to which the shape diverges toward the end, i.e., the inclination angle, may be determined from this perspective. Figure 39 shows an example in which the pressing portion 22 is an elongated rectangular parallelepiped and a pair of through slits 18 have a V-shaped side cross section that widens from the annular surface 40 toward the pressing surface 54, and Figure 40 shows an example in which the pressing portion 22 and the pair of through slits 18 are both elongated rectangular parallelepipeds. In the cases of Figures 38 and 39, even if a small clearance is provided between the pressing portion 22 and the corresponding through slit 18, it is possible for the pressing portion 22 to be engaged and held within the through slit 18, but in the case of Figure 40, it is preferable to allow the pressing surface 54 to move toward the inside of the through slit 18 so as not to hinder the movement of the inner and outer tubes 12, 14 in the tube longitudinal direction while maintaining a tight fit. As another modified example, an opening may be provided on the outer peripheral surface of the outer tube, diametrically opposite to the female threaded portion 20, and the male threaded portion 26 of the fastening screw 24 may be screwed into the female threaded portion 20 through the clearance hole 32 of the pressing plate. When the tip of the male threaded portion 26 protrudes from the inner peripheral surface of the outer tube 14, a processing tool may be inserted into the inside of the outer tube 14 from the opening to crimp the tip of the male threaded portion 26 to the extent that it does not impede the relative movement in the longitudinal direction of the fitting portion of the inner and outer tubes 12, 14, thereby forming a protrusion around the opening of the through slit 18 on the inner peripheral surface side of the outer tube 14, thereby preventing the fastening screw 24 from being loosened too much and the pressing portion 22 of the pressing portion from completely coming out of the corresponding through slit 18.

[0030] 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.

[0031] 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.

[0032] 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. 8 to 10. 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.

[0033] 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.

[0034] 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 by a tubular protrusion 65 provided on the outer peripheral surface of the outer tube 14. The length adjustment jig 10 is interposed between the inner tube 12 and outer tube 14 which are fitted together, and has a pressing portion 22 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 fastening screw portion 24 which can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The fastening screw portion 24 is similar to the first embodiment in that it has a male thread portion 26 which can be screwed into the female thread portion 20. However, whereas in the first embodiment, the outer peripheral surface 16 of the outer tube 14 has a pair of through slits 18 and the female thread portion 20 between them, in this embodiment, a tubular protrusion 65 is provided at a position corresponding to the female thread portion 20, facing outward perpendicular to the outer peripheral surface 16 of the outer tube 14. More specifically, the tubular protrusion 65 has a circular annular cross section with a predetermined height h, has a female thread 20 formed therein so as to align with the female thread 20, and is capable of being screwed with the male thread 26 of the fastening screw portion 24. The tubular protrusion 65 may be fixed to the outer circumferential surface 16 separately from the outer tube 14, for example, by welding. The outer shape of the tubular protrusion 65 does not need to be cylindrical, and may be any shape as long as the female thread 20 is formed therein so as to align with the female thread 20. According to this embodiment, it is effective when the thickness of the outer tube 14 is thin and the screw-in length of the male thread portion 26 cannot be sufficiently secured, and the predetermined height h may be determined from this viewpoint. Note that, like the first embodiment, the length of the male thread portion 26 is set so that the tip of the male thread portion 26 does not hit the outer circumferential surface 15 of the inner tube 12 when the pressing portion 22 is pressed and fixed against the outer circumferential surface 15 of the inner tube 12. As a modified example, conversely, when the thickness of the outer pipe 14 is large, the outer circumferential surface 16 of the outer pipe 14 may be ground inwardly around the female thread portion 20 between a pair of through slits 18 to form a shallow groove portion (not shown) having a bottom surface, and a through hole having the female thread portion 20 on the bottom surface may be provided. The depth of the shallow groove portion, i.e., the grinding depth of the outer circumferential surface 16 may be appropriately set according to the thickness of the outer pipe 14 and / or the length of the male thread portion 26, thereby ensuring versatility regardless of the conditions of the inner and outer pipes 12, 14 and the fastening screw portion 24.

[0035] The fourth 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. 12 and 13. The fourth embodiment of the present invention is characterized by the fastening screw portion 24, which 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 pair of through slits 18 and comes into contact with the outer peripheral surface 15 of the inner tube 12, and a fastening screw portion 24 which is capable of pressing and fixing the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12, which is common to the first embodiment. However, in the first embodiment, the fastening screw portion 24 has a male thread portion 26, and the outer peripheral surface 16 of the outer tube 14 has a pair of through slits 18 and a female thread portion 20 between the pair of through slits 18. However, in this embodiment, on the contrary, the fastening screw portion 24 has a nut portion 70 having a female thread portion 72, and the outer peripheral surface 16 of the outer tube 14 has a male thread portion 74. More specifically, the nut portion 70 has a female threaded portion 72 that can be screwed into the male threaded portion 74 penetrating through its center, and a shallow groove is provided on the outer peripheral surface to prevent slipping when tightening by hand. Meanwhile, at the position of the female threaded portion 20 on the outer peripheral surface 16 of the outer tube 14, the male threaded portion 74 is provided orthogonally facing outward relative to the outer peripheral surface 16 of the outer tube 14, and the female threaded portion 20 is omitted. The male threaded portion 74 may be fixed to the outer peripheral surface 16, for example, by welding. According to this embodiment, when the nut portion 70 is loosened, the pressing body 34 itself is maintained in a state inserted into the male thread portion 74 via the clearance hole 32. Therefore, it is possible to prevent the pressing body 34 itself from accidentally coming loose and falling apart when the fastening screw portion 24 is loosened, as in the first embodiment.

[0036] The fifth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic parts of this embodiment will be described in detail with reference to FIG. The fifth embodiment of the present invention is characterized by a coil spring 76 provided between the outer peripheral surface 16 of the outer tube 14 and the pressing portion 22. The length adjustment jig 10 is interposed between the inner tube 12 and the outer tube 14 which are fitted together, and has a pressing portion 22 which 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 can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The fastening screw portion 24 is common to the first embodiment in that it has a male screw portion 26 which can be screwed into the female screw portion 20. However, in the first embodiment, such a coil spring 76 is not provided. More specifically, a coil spring 76 is provided which can be inserted into the male threaded portion 26 of the fastening screw portion 24 through the clearance hole 32 of the pressing portion 22 and has a diameter larger than the diameter of the female threaded portion 20, and the number of turns of the coil may be set appropriately according to the U-shaped height of the pressing portion 22. According to this embodiment, when the male threaded portion 26 of the tightening screw portion 24 is screwed into the female threaded portion 20, the pressing portion 22 is supported on the upper surface of the coil spring 76, so that the pressing end face 54 protrudes from the corresponding through slit 18 toward the outer peripheral surface 15 of the inner tube 12, making it possible to prevent the pressing portion 22 from getting in the way when moving the inner tube 12 relative to the outer tube 14 in the extension direction of the tubes in order to adjust the fitting position between the inner tube 12 and the outer tube 14. Furthermore, by increasing the biasing force of the coil spring 76, when the coil spring 76, which is provided between the outer peripheral surface 16 of the outer tube 14 and the pressing portion 22, is compressed, the pressing portion 22 is pressed upward toward the fastening screw portion 24, strengthening the screwed state between the male threaded portion 26 and the female threaded portion 20. It is also possible to prevent in advance, for example, the fastening screw portion 24 from loosening over time, causing the fixed support between the inner tube 12 and outer tube 14, which are fitted together, to become unstable.

[0037] The sixth embodiment of the present invention will be described below. In the following description, the same components as 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 Figs. 15 to 17. The sixth embodiment of the present invention is characterized by a protective plate 78 provided between the inner tube 12 and the outer tube 14. The sixth embodiment of the present invention is a length adjustment jig 10 interposed between the inner tube 12 and the outer tube 14 which fit together, and has a pressing portion 22 which 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 can press and fix the pressing portion 22 against the outer peripheral surface 15 of the inner tube 12. The fastening screw portion 24 is common to the first embodiment in that it has a male screw portion 26 which can be screwed into the female screw portion 20. However, in the first embodiment, such a protective plate 78 is not provided. More specifically, the protective plate 78 has a width W that is longer than the length of the pair of through slits 18, and a length L that is longer than the distance between the pair of through slits 18 in the extension direction of the inner and outer tubes 14, and is made of a material that is softer than the outer peripheral surface 15 of the inner tube 12. As shown in Figure 16, a shallow groove 80 of a size that allows the protective plate 78 to fit into is provided on the inner peripheral surface of the outer tube 14 in which the pair of through slits 18 are provided. When the protective plate 78 is fitted into the shallow groove 80, it protrudes slightly inward from the inner peripheral surface of the outer tube 14. When the fastening screw portion 24 is tightened, the pressing portion 22 is pressed and fixed against the outer peripheral surface 15 of the inner tube 12, so that the protective plate 78 is also crushed, and the pressing end face 54 comes into direct contact with the outer peripheral surface 15 of the inner tube 12, making it possible to prevent the outer peripheral surface 15 of the inner tube 12 from being scratched or dented. Furthermore, by making the protective plate 78 out of rubber, which has a high friction coefficient, it is possible to ensure the frictional force between the protective plate 78 and the outer peripheral surface 15 of the inner tube 12, thereby further strengthening the fixed support between the inner tube 12 and the outer tube 14. Note that Figure 17 shows a modified example in which a pair of protective plates 82 are provided, and each protective plate 82 is arranged so that it can be fitted into the corresponding through slit 18. When the pressing portion 22 is pressed and fixed against the outer peripheral surface 15 of the inner tube 12, each protective plate 82 is also crushed, preventing the outer peripheral surface 15 of the inner tube 12 from being scratched or dented, and ensuring friction between the protective plates 82 and the outer peripheral surface 15 of the inner tube 12. However, the shallow groove 80 provided on the inner surface of the outer tube 14 can be omitted.

[0038] The seventh 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 FIG. The seventh embodiment of the present invention is characterized in the direction of the pair of through slits 18 and the female screw portion 20 between the pair of through slits 18. The length adjustment jig 10 is interposed between the inner tube 12 and the outer tube 14 that are fitted to each other, and has a pressing portion 22 that passes through the pair of through slits 18 and contacts the outer circumferential surface 15 of the inner tube 12, and a fastening screw portion 24 that can press and fix the pressing portion 22 against the outer circumferential surface 15 of the inner tube 12, and the fastening screw portion 24 has a male screw portion 26 that can be screwed into the female screw portion 20, which is common to the first embodiment. However, in the first embodiment, the orientation of the pair of through slits 18 and the female thread portion 20 between the pair of through slits 18 provided on the outer peripheral surface 16 of the outer tube 14 was along the extension direction of the inner tube 12 and the outer tube 14, whereas in this embodiment, the orientation of the pair of through slits 18 and the female thread portion 20 between the pair of through slits 18 is oblique to the extension direction of the inner tube 12 and the outer tube 14, and accordingly, the orientation of the pressing body 34 provided via the pair of through slits 18 is oblique. According to this embodiment, in addition to fixing and supporting the inner tube 12 and the outer tube 14 in the extension direction of the inner tube 12 and the outer tube 14, it is also effective in fixing and holding the inner tube 12 and the outer tube 14 against rotation between them about the extension direction of the inner tube 12 and the outer tube 14. The oblique angle of the pair of through slits 18 and the female thread portion 20 between the pair of through slits 18 with respect to the extension direction of the inner tube 12 and the outer tube 14 should be determined from this viewpoint.

[0039] The eighth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and the description thereof will be omitted. Below, the characteristic parts of this embodiment will be described in detail with reference to FIG. The eighth 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.

[0040] 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.

[0041] The ninth 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 FIG. The eighth embodiment of the present invention is characterized in that the length adjustment jig 10 is used as a so-called earthquake brace. More specifically, in order to prevent furniture, such as a shelf, from falling over during an earthquake, the length adjustment jig 10 has a ceiling-side fixing portion 90 provided on the upper end surface 98 of the inner tube 12, and a shelf-side fixing portion 84 provided on the lower end surface 96 of the outer tube 14 of the length adjustment jig 10, and the length adjustment jig 10 is interposed between the ceiling-side fixing portion 90 and the shelf-side fixing portion 84. The ceiling-side fixing portion 90 has an abutment surface 92 that can abut against the ceiling surface, and has a receiving portion 94 that can receive an upper end surface 98. The shelf-side fixing part 84 has abutment surfaces 89 that are perpendicular to each other and abutment surfaces 86 that can abut against the top surface of the shelf so that it can be attached to the clearance between the wall and the shelf at the corner of the walls that intersect perpendicularly, and has a receiving part 88 that can receive a lower end surface 96. With this configuration, it is possible to adjust the fitting position of the inner pipe 12 and the outer pipe 14 so that the abutment surface 92 of the ceiling-side fixing part 90 abuts against the ceiling surface and the abutment surface 86 of the shelf-side fixing part 84 abuts against the top surface of the shelf, and then use the fastening screw part 24 to firmly fix and support the inner peripheral surface of the outer pipe 14 to the outer peripheral surface of the inner pipe 12 via the pressing part 22. For example, it is possible to provide a plurality of such length adjustment jigs 10 between the ceiling and the shelf to firmly fix the shelf to the ceiling.

[0042] The tenth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic parts of this embodiment will be described in detail with reference to Figs. 24 to 26. The tenth embodiment of the present invention is characterized in that it is applied as an inclination angle adjustment jig to support a solar panel and adjust the inclination angle, taking a solar panel as an example.

[0043] More specifically, the inclination angle adjustment jig has a tubular portion 102 having an outer surface 16 with a female thread portion 20 and at least one through hole 18 within a predetermined range from the female thread portion 20, a first support bar 104 extending at a predetermined angle to the extension direction of the tubular portion 102 and having a lower end 103 grounded, and a pivot 108 connecting an upper end 106 of the first support bar 104 to the tubular portion 102, and the upper end 106 of the first support bar 104 is connected to the tubular portion 102 so as to be rotatable around the pivot 108. Furthermore, it has a second support bar 112 that is slidably fitted into the tubular portion 102, extends along the extension direction of the tubular portion 102, and has a lower end 103 that is grounded, at least one pressing portion 22 that passes through the through hole 18 from the outer circumferential surface 16 of the tubular base portion and comes into contact with the outer circumferential surface 16 of the second support bar 112, and a fastening screw portion 24 that can press and fix the pressing portion 22 against the outer circumferential surface 16 of the second support bar 112, the tip surface of the pressing portion 22 is shaped to follow the outer circumferential surface 16 of the second support bar 112 so as to be in surface contact with the outer circumferential surface 16 of the second support bar 112, the fastening screw portion 24 has a male thread portion that can be screwed into the female thread portion 20, and the pressing portion 22 has a clearance hole 32 through which the male thread portion 26 can pass. By moving the first support bar 104 within the plane P formed by both support bars so that the distance between the lower ends 103 of both support bars changes, the upper end 106 of the first support bar 104 rotates around the pivot 108 relative to the tubular portion 102 while adjusting the fitting position of the tubular base portion relative to the second support bar 112.Then, the tightening screw portion 24 screws the male threaded portion 26 into the female threaded portion 20 through the clearance hole 32, while the pressing portion 22 penetrates the through hole 18 to press and fix the tip surface against the outer peripheral surface 16 of the second support bar 112 in a surface contact manner, making it possible to adjust the inclination angle of the second support bar 112 relative to the contact surface. Each of the tubular portions 102 further has a pair of opposing overhanging flanges 116 that extend from its outer surface in a direction intersecting the extension direction of the tubular portion 102, and each of the pair of overhanging flanges 116 has a first through hole 120 capable of receiving a corresponding end 118 of the pivot 108, and the upper end 106 of the first support bar 104 is provided with a second through hole 122 through which the pivot 108 can pass in a direction intersecting the extension direction of the first support bar 104, and the upper end 106 of the first support bar 104 is positioned between the pair of overhanging flanges 116 so that the first through hole 120 and the second through hole 122 are aligned, and the pivot 108 is provided passing through each of the first through holes 120 and the second through hole 122. A pair of such inclination angle adjustment jigs are provided so that the planes P formed by both support bars are parallel, and the rectangular plate-shaped weight W is supported at four points by the lower ends 103 of the first support bars 104 and the lower ends 103 of the second support bars 112 of the inclination angle adjustment tool while each of the opposing edges of the rectangular plate-shaped weight W is supported by the second support bars 112 of the inclination angle adjustment tool, and the inclination angle θ of the rectangular surface of the rectangular plate-shaped weight W is adjusted by adjusting the fitting position of each tubular base part of the inclination angle adjustment tool relative to the corresponding second support bar 112 and adjusting the inclination angle of each corresponding second support bar 112 of the inclination angle adjustment tool, thereby forming a support and inclination angle adjustment device for the rectangular plate-shaped weight W. The pair of inclination angle adjustment jigs are connected by an X-shaped cross member 124.

[0044] According to the inclination angle adjustment jig having the above configuration, the second support bar 112 is fitted inside the tubular portion 102 so as to be movable in the longitudinal direction of the tube, and the first support bar 104 is connected to the tubular portion 102 via a pivot 108 and is rotatable about the pivot 108. The outer circumferential surface of the tubular portion 102 is provided with a female screw portion and at least one through hole within a predetermined range from the female screw portion 72, and has at least one pressing portion 22 that passes through the through hole from the outer circumferential surface of the tubular base portion 102 and contacts the outer circumferential surface of the second support bar 112, and a fastening screw portion 24 that can press and fix the pressing portion 22 against the outer circumferential surface of the second support bar 112, and the tip surface of the pressing portion 22 is shaped to follow the outer circumferential surface of the second support bar 112 so as to be in surface contact with the outer circumferential surface of the second support bar 112. The fastening screw portion 24 has a male screw portion 26 that can be screwed into the female screw portion 72, and the pressing portion 22 has a clearance hole portion 32 through which the male screw portion 26 can pass. Therefore, by moving the first support bar 104 so that the distance between the lower ends of both support bars changes within the plane formed by both support bars, the upper end of the first support bar 104 rotates around the pivot 108 relative to the tubular portion 102, adjusting the fitting position of the tubular base portion 102 relative to the second support bar 112, and then the fastening screw 72 is inserted into the second support bar 112. By using screw portion 24 to screw male thread portion 26 into female thread portion 72 via clearance hole portion 32, while pressing portion 22 is inserted through the through hole and the tip surface is pressed and fixed in a surface contact manner against the outer circumferential surface of second support bar 112, the inclination angle θ of second support bar 112 with respect to the contact surface can be adjusted with simple operation without requiring excessive tightening force, for example, the inclination angle θ of the rectangular surface when a rectangular heavy object is supported by second support bar 112. When providing support stands on each side of the solar panel, rather than providing a pivot 108 for each support stand, a single pivot 108 passing through the horizontal direction of the solar panel is used as a shared pivot 108. When adjusting the tilt angle θ of the solar panel from large to small depending on the season from winter to summer, or the movement of the sun from sunrise to sunset throughout the day, a torque-applying grip provided on only one side is used to manually loosen and retighten the fastening, and the weight of the solar panel acts to automatically rotate the single pivot 108 during this time, making it possible to continuously adjust the tilt angle θ of the solar panel depending on the time width of the fastening and loosening.

[0045] The eleventh embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and the description thereof will be omitted. Below, the characteristic parts of this embodiment will be described in detail with reference to Figs. 27 and 28. The feature of the eleventh embodiment of the present invention is that, whereas in the above-mentioned embodiments, the inner and outer tubes 14 were used only to adjust the length of the inner and outer tubes 14 by adjusting the fitting positions of the inner and outer tubes 14, or the inner and outer tubes 14 were used only as a stand while supporting a weight object with either the inner or outer tube 14 and adjusting only the inclination angle θ of the rectangular surface of the rectangular weight object with either the inner or outer tube 14 supported, the present embodiment is adapted to be applied to traffic signs, so that the inclination angle θ, lateral position, and height of the traffic sign can all be adjusted.

[0046] More specifically, the present invention has inner and outer tubes 12, 14 that stand vertically from the ground, a tubular section 102 that is provided crossing the upper end of the outer tube 14, a diagonal tube 126 that fits inside the tubular section 102, and a traffic sign T that is provided at the upper end of the diagonal tube 126, and the height of the inner and outer tubes 12, 14 can be adjusted, and by adjusting the position of the diagonal tube 126 relative to the tubular section 102, the lateral position can be adjusted, and the inclination angle θ of the traffic sign T relative to the upper end of the diagonal tube 126 can be adjusted.The present invention is applied to a fixed support jig for a stand that supports and fixes a heavy object with either the inner or outer tubes 12, 14, an overall length adjustment jig for the inner and outer tubes 12, 14, and an inclination angle adjustment jig that rotatably connects the inner tube 12 and the outer tube 14 via a pivot 108 and adjusts the fitting position of the inner tube 12 and the outer tube 14. The configuration of each adjustment jig is the same as that of the above-described embodiment, and therefore a detailed description thereof will be omitted. According to the above configuration, it is possible to stably support traffic signs T that are permanently placed outdoors and may extend over several tens of kilometers, while easily adjusting the orientation and / or position thereof.

[0047] The twelfth embodiment of the present invention will be described below. In the following description, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Below, the characteristic parts of this embodiment will be described in detail with reference to Figs. 19, 36 to 37. The feature of the twelfth embodiment of the present invention is that, whereas in the above-mentioned embodiments, the inner and outer tubes 14 could be used only to adjust the length of the inner and outer tubes 14 by adjusting the fitting positions of the inner and outer tubes 14, or the inner and outer tubes 14 could be used only as a stand while supporting a weight object with either the inner or outer tube 14 and adjusting only the inclination angle θ of the rectangular surface of the rectangular weight object with either the inner or outer tube 14 supported, the present embodiment is adapted to be applied to traffic signs, so that the inclination angle θ, lateral position, and height of the traffic sign can all be adjusted. As shown in Figures 19, 36 to 37, 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, suspended diagonally from the upper ends of each inner tube 12, and thus 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, the fixing support jig of the present invention is also applied to the connection between the X-shaped cross members Y3, Y4 and the outer tube 14, and the fixing support jig of the present invention is used for the fitting portion of the inner and outer tubes 12, 14 to support the steel pan at a specified height, and when folding the stand after use, the fastening screw portion 24 of the fixing support jig is loosened and the fixing support jig is moved upward along the outer tube 14 to straighten the X-shaped cross members Y3, Y4. As a result, when a large stand supporting a large and heavy object such as a steel pan is transported, it is not bulky by folding it, and is convenient for transportation by car, for example, and can be carried with one hand, and can be deployed as a stand at the site of use with one touch. The structure of the fixing support jig is the same as that of the eleventh embodiment, so a detailed description thereof will be omitted. As a modified example, as shown in FIG. 20, 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.

[0048] As described above, the first to ninth embodiments are described as a length adjustment jig, the tenth to twelfth embodiments are described as a fixed support adjustment jig serving as a stand for supporting a weight, and the twelfth embodiment is described as an inclination angle adjustment jig. However, all of these jigs are common to the integral structure of the inner and outer tubes 12, 14 that constitutes these jigs at the fitting position of the inner and outer tubes 12, 14. The manufacturing method of the integral structure of the inner and outer tubes 12, 14 is as follows: A step of machining, 3D printer modeling, or lost wax processing a pair of through slits 18 and a female screw portion 72 on an outer surface of a solid or hollow inner tube 12 and a hollow outer tube 14 that fit together, the outer surface corresponding to the fitting portion of the outer tube 14; This is a step of preparing a pressing portion 22 having a U-shaped cross section, which penetrates a pair of through slits 18 from the outside of the outer surface and can be pressed against the outer circumferential surface 15 of the inner tube 12 in a tight contact manner by surface contact at two points, the pressing portion 22 having a clearance hole 32, and a tightening screw portion 24 having a female screw portion 72 and a torque applying grip 132 that can be screwed into the female screw portion 72, in which the diameter of the torque applying grip 132 is selected according to the support load so that it can be firmly supported by hand force alone, and at a predetermined fitting position, the male screw portion 26 is screwed into the female screw portion 72 through the clearance hole 32 by tightening the tightening screw portion 24 by hand force via the torque applying grip 132. and pressing and fixing the pressing portion 22 toward the outer peripheral surface 15 of the inner tube 12 in a surface contact manner, while pressing and fixing the outer peripheral surface 15 of the inner tube 12 on the opposite side of the surface contact portion of the pressing portion 22 with the inner tube 12 against the inner peripheral surface of the outer tube 14, thereby forming an overall length adjustment jig for the inner and outer tubes 12, 14, or an inclination angle adjustment jig by adjusting the fitting position of the inner tube 12 and outer tube 14 by rotatably connecting the inner tube 12 and outer tube 14 via the pivot 108, or a fixed support jig for a stand that supports and fixes a heavy object with either the inner or outer tube 12, 14, and then fixing the inner tube 12 and outer tube 14 together in the longitudinal direction of the tubes to complete the process.

[0049] More specifically, the inner tube 12 and the outer tube 14 may be made of either metal or resin, and may be manufactured based on either a solid material or a molten material. Depending on the material, the manufacturing methods are broadly classified as follows: If the material is metal, solid materials can be machined, such as pressed, cut, or drilled, while molten materials can be cast or modeled using a 3D printer. If the material is resin, solid materials can be machined, while molten materials can be molded, such as injection molding or blow molding, or modeled using a 3D printer. In particular, when casting metal, the lost wax method or full mold method is preferred, and when modeling metal using a 3D printer, metal powder is used. It is preferable that the inner tube 12 and the outer tube 14 are made of resin from the viewpoint of light weight, but it is preferable that the male threaded portion 26 of the fastening screw and the female threaded portion 72 into which the male threaded portion 26 screws are both made of metal from the viewpoint of durability. If the opening of the resin outer tube 14 is the male threaded portion 26, a metal nut having the male threaded portion 26 may be fitted into the opening of the resin outer tube 14, or if the thickness of the resin outer tube 14 is thin, a thickness may be increased locally to ensure the thickness of the female threaded portion 72.

[0050] 3D printed objects are created using a 3D printer by a known method called fused deposition modeling. Specifically, the manufacturing method includes a step of melting a resin composition or filament, and a step of extruding the resulting melt from a nozzle of a 3D printed object manufacturing device to create a 3D printed object. In the melting step, the propylene resin composition for 3D printers or the 3D print material which is the filament for 3D printers is melted. The heating means for melting the 3D print material is not particularly limited, and known heating means can be applied. In the melting step, it is preferable to use a 3D print object manufacturing device equipped with a heating means such as an electric heater. The temperature at which the 3D printing material is melted is not particularly limited and may be appropriately set according to the properties of the thermoplastic resin. The temperature at which the 3D printing material is melted may be, for example, a temperature of +10 to 150°C based on the higher of the melting point or glass transition temperature (Tg) of the thermoplastic resin. In the melting step, for example, the material for 3D printing may be melted and kneaded. By melting and kneading the material for 3D printing, the material for 3D printing tends to be mixed more uniformly. Therefore, the occurrence of unevenness in the material of the obtained 3D printed object is easily suppressed. As a result, the deformation of the 3D printed object tends to be further suppressed.

[0051] In the modeling process, the 3D printing material melted in the melting process is extruded from a nozzle to create a 3D printed object. In the modeling process, for example, the molten 3D printing material is extruded from the nozzle of a 3D printing object manufacturing device, and a 3D printed object is created by sequentially stacking 2D layers on a substrate based on multiple 2D data. The multiple 2D data are generated by slicing the 3D coordinate data of the 3D printed object to be created using slicer software. The 3D print object manufacturing device may be a material extrusion type 3D print object manufacturing device. The material extrusion type 3D print object manufacturing device is not particularly limited, and a known device or known device configuration may be applied. The 3D print object manufacturing device may be, for example, a device including a cylinder, a nozzle, and a heating means. The 3D print object manufacturing device is supplied with a material for 3D print modeling. The nozzle is provided at a downstream side of the cylinder in the discharge direction of the material for 3D print modeling. The nozzle discharges the material for 3D print modeling. The heating means is provided at the cylinder. The heating means heats and melts the material for 3D print modeling. The 3D printing object manufacturing device extrudes the heated and melted 3D printing material from a nozzle, and then layer-by-layer models the 3D printing material extruded from the nozzle, thereby creating a 3D printed object.

[0052] The cylinder may have a screw therein, the screw mixing the 3D printing material. The 3D printing object manufacturing apparatus may further include a table device that is disposed opposite the nozzle. The molten 3D printing material extruded from the nozzle is stacked on the table device. The 3D printed object manufacturing apparatus may further include a control means for controlling the spatial coordinates of the substrate and the nozzle, and the amount of the 3D printing material extruded from the nozzle. The control means preferably controls the discharge of the molten 3D printing material extruded from the nozzle, and controls the movement of the nozzle and / or the table device in the X-axis, Y-axis, and Z-axis directions relative to a reference plane.

[0053] Meanwhile, the lost-wax process can be broadly classified into two types based on the manufacturing method: a method in which the pattern used to create the mold is removed from the mold by dissolving or burning it off, and the space between the pattern and the mold is filled with molten metal to cast the product (burnt pattern methods such as the lost-wax process and full mold process), and a method in which the pattern itself is not burned off, but is demolded (physically removed) from the mold to create the mold shape, or the mold itself is created by machining, etc., and the product is then cast (non-burnt pattern methods such as the Shaw process and die casting process).

[0054] The lost wax process uses wax as the pattern material, and after a model formed using a metal mold is layered and hardened with a slurry mold material, the wax is removed (heated and dissolved, burned off), and the space where the original model was is filled with molten metal to create a casting.The full mold process uses polystyrene foam or other resin material as the pattern material, and a model made by molding with a metal mold or directly machining is embedded in the mold material, and molten metal is poured in as it is, and the model disappears as the molten metal is filled in to create a casting.

[0055] The pressing surface has an outer shape of an elongated rectangle, and the area of ​​the elongated rectangle is preferably determined from the viewpoint of increase or decrease in pressing pressure due to the fastening force of the screw, for example, when the inner and outer pipes 12, 14, especially the inner pipe 12, are made of resin, it is preferable to ensure the area of ​​the elongated rectangle from the viewpoint of protecting the outer circumferential surface 15 of the inner pipe 12. The surface shape is preferably a shape that follows the outer circumferential surface 15 of the inner pipe 12 so as to be able to abut closely against the outer circumferential surface 15 of the inner pipe 12, for example, an arc-shaped curved surface when the inner pipe 12 has a circular cross section, a flat surface when abutting against one surface of the rectangular cross section when the inner pipe 12 has a rectangular cross section, and a flat surface bent inwardly in a broken line so as to straddle two adjacent intersecting surfaces when abutting against a corner of the rectangular cross section.

[0056] According to the manufacturing method of the integral structure of the inner and outer tubes having the above-mentioned configuration, when preparing the inner and outer tubes which fit together, the pressing portion 22 having the clearance hole 32, and the fastening screw portion having the female screw portion and the torque application grip 132 which can be screwed into the female screw portion, the diameter of the torque application grip 132 is selected according to the support load determined according to the application of the integral structure of the inner and outer tubes as a length adjustment jig, an inclination angle adjustment jig, or a fixed support jig for a stand, and at a predetermined fitting position of the inner and outer tubes, the fastening screw portion is fastened by hand force via the torque application grip 132 to screw the male screw portion into the female screw portion through the clearance hole 32, thereby rotating the pressing portion 22 toward the outer circumferential surface 15 of the inner tube 12. By pressing and fixing the outer circumferential surface 15 of the tube 12 in a surface contact manner, and pressing and fixing the outer circumferential surface 15 of the inner tube 12 on the opposite side of the surface contact portion of the pressing portion 22 with the inner tube 12 against the inner circumferential surface of the outer tube, it is possible to form an overall length adjustment jig for the inner and outer tubes, or an inclination angle adjustment jig by adjusting the fitting position of the inner tube 12 and outer tube by rotatably connecting the inner tube 12 and outer tube via a pivot, or a fixed support jig for a stand that supports and fixes heavy objects with either the inner or outer tube, and by completing the fixing of the inner tube 12 and outer tube together in the longitudinal direction of the tubes, it is possible to provide a manufacturing method for an integrated structure of inner and outer tubes that can firmly support the inner and outer tubes together using only manual force, depending on various applications. EXAMPLES

[0057] In order to confirm the effects of the present invention, the inventors manufactured a prototype and carried out a limit load test. The prototype comprises an inner pipe 12 made of metal or resin, an outer pipe 14 fitted to the inner pipe 12, a tubular portion 102 firmly fixed to the end of the outer pipe 14 and provided with a female screw portion 72 and a pair of through slits 18 sandwiching the female screw portion 72, a metal pressing body having a U-shaped cross section with a clearance hole 32, and a fastening screw having a male screw portion 26 screwed into the female screw portion 72 of the outer pipe 14 through the clearance hole 32 of the pressing body. As a comparative example, a jig was prepared in which a pair of overhanging flanges 116 facing each other in the longitudinal direction of the pipe were provided on the tubular portion 102 as a conventional product, and the clearance between the pair of overhanging flanges 116 was narrowed by tightening the fastening screw against the female screw portions 72 provided on each overhanging flange 116, thereby pressing the inner peripheral surface of the outer pipe 14 against the outer peripheral surface 15 of the inner pipe 12. The specific test method was to apply a predetermined torque to the screw using a hammer trench, and in this state the pressing surface of the pressing body was pressed against the outer peripheral surface 15 of the inner tube 12. In this state, the lower end of the outer tube 14 was placed on a horizontal test stand, and the integrated structure of the inner and outer tubes 12, 14 via the tubular portion 102 was fixed upright. A compressive load was then applied from the upper end of the inner tube 12 in the vertical direction, which is the extension direction of the inner and outer tubes, to measure the critical compressive load at which the outer tube 14 began to move relative to the inner tube 12. For each of several prototypes, the change in limit compressive load was ascertained using a specified torque as a parameter.

[0058] The test conditions are shown in Figure 29, and the test results are shown in Figures 30 to 32. In each case, as the load was applied, a slight compression specific to the material of the prototype occurred, and a limit load was reached at which the prototype could no longer support the inner and outer tubes 12, 14 in a fixed position. After that, the load decreased with movement, and in this test, the limit load under a specified torque was measured.

[0059] According to Figure 29, assuming that the outer tube 14 is made of brass, 32φ, and 4 mm thick, the inner tube 12 is made of brass, and the screw is M10 (pitch 1.5 mm), the torque is approximately 30N, and the limit support load is approximately 400KG. It was confirmed that if torque is applied mechanically, it can be fully applied not only to stands for everyday items, but also to industrial stands installed outdoors, such as stands for solar panels. Furthermore, according to these results, when the supporting load is 100 kg, the required torque is approximately 7.5 N, which is one-quarter of 30 N, and is approximately five times the maximum torque of 1.6 N that can be generated by hand. It was confirmed that by enlarging the grip diameter by five times, it is practically possible to grip it by hand and use hand force to apply a torque sufficient to withstand a supporting load of 100 kg. 30 to 32, for a maximum torque of 1.6N applied by hand, the limit support load of the conventional product is approximately 200N, whereas the limit support load of the prototype in this study is 800N, which is approximately four times that amount; for a torque of 0.8N within the range of hand force, the limit support load of the ABS resin inner and outer tubes 12, 14 is approximately 90N, whereas the limit support load of the prototype in this study is 270N, which is approximately three times that amount; and it was confirmed that in the case of the ABS resin inner and outer tubes 12, 14, a shallow scratch-like depression was formed in the longitudinal direction of the tube at the contact portion of the pressing surface on the outer surface of the inner tube 12. In addition, when the inner tube 12 is made of resin, the pressing surface of the pressing body is pressed against the outer peripheral surface 15 of the inner tube 12 by tightening the fastening screws. Therefore, if the area of ​​the pressing surface is too small, the pressing pressure against the outer peripheral surface 15 of the inner tube 12 will increase. Even if the thickness of the inner tube 12 is sufficient to prevent deformation of the inner tube 12 itself when supporting the longitudinal load of the inner and outer tubes 12, 14, the outer peripheral surface 15 of the inner tube 12 may be scratched or, in some cases, dented. Therefore, it is considered best to adjust the area of ​​the pressing surface of the pressing body, taking into consideration the hardness of the resin of the inner tube 12, so that the pressing pressure is within a range that prevents damage to the outer peripheral surface 15 of the inner tube 12 even when the fastening screws are tightened by hand. As described above, this test confirmed that stable load support by manual force within a practical range is possible by selecting the diameter of the torque applying grip 132 according to the load to be supported.

[0060] Although the embodiment of the present invention has 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 female thread portion 20 of the outer tube 14 or the tubular base portion 102 so as not to come into contact with the outer surface of the inner tube 12. However, without being limited to this, 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.

[0061] For example, in the first embodiment, it was described that the fastening screw portion 24 has a male thread portion 26 and a head portion 58 that is gripped with the fingers and rotated, while the female thread portion 20 is provided on the outer peripheral surface 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 24 may be in the form of a nut that screws onto the male thread portion 26. For example, in the first embodiment, a single length adjustment jig is provided at a predetermined position of 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 12, 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. In addition, the second to seventh embodiments may be combined in any manner. For example, when the outer tube 14 is thin and the outer peripheral surface of the inner tube 12 is slippery, a tubular protrusion portion 65 may be provided on the outer peripheral surface 16 of the outer tube 14 and a protective plate 78 may be provided between the inner tube 12 and the outer tube 14. For example, when the inner and outer tubes 12, 14 are to be held fixed for a long period of time while suppressing relative rotation in the extension direction between them, a coil spring 76 may be provided between the outer peripheral surface 16 of the outer tube 14 and the pressing portion 22, and the direction of the pair of through slits 18 and the female screw portion 20 between the pair of through slits 18 may be oblique to the extension direction of the inner tube 12 and the outer tube 14. [Brief description of the drawings]

[0062] [Figure 1] 1 is a partial perspective view of an outer tube 14 of a length adjustment jig according to a first embodiment of the present invention. FIG. [Diagram 2] 2 is a perspective view of a fastening screw portion 24 of the length adjustment jig according to the first embodiment of the present invention. FIG. [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] 1 is a schematic cross-sectional view of a length adjustment jig according to a first 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] FIG. 11 is a perspective view of a length adjustment jig according to a second embodiment of the present invention. [Figure 10] 7 is a view similar to FIG. 6 showing a length adjusting jig according to a second embodiment of the present invention. [Figure 11] FIG. 11 is an exploded perspective view of a length adjustment jig according to a third embodiment of the present invention. [Figure 12] FIG. 11 is an exploded perspective view of a length adjustment jig according to a fourth embodiment of the present invention. [Figure 13] FIG. 11 is an exploded perspective view of a length adjustment jig according to a fourth embodiment of the present invention. [Figure 14] FIG. 13 is an exploded perspective view of a length adjustment jig according to a fifth embodiment of the present invention. [Figure 15] FIG. 13 is an exploded perspective view of a length adjustment jig according to a sixth embodiment of the present invention. [Figure 16] FIG. 13 is an exploded perspective view of a length adjustment jig according to a sixth embodiment of the present invention. [Figure 17] FIG. 13 is an exploded perspective view of a length adjustment jig according to a modified example of the sixth embodiment of the present invention. [Figure 18] FIG. 13 is a perspective view of a length adjustment jig according to a seventh embodiment of the present invention. [Figure 19] 1 is a perspective view of a length adjustment jig according to a first embodiment of the present invention, applied to a musical instrument stand; [Figure 20] 1 is a perspective view of a length adjustment jig according to a first embodiment of the present invention, applied to a microphone stand; [Figure 21] 1, but showing a length adjustment jig according to an eighth embodiment of the present invention. FIG. [Figure 22] FIG. 13 is a perspective view of a length adjustment jig according to a ninth embodiment of the present invention, applied for use as an earthquake brace. [Diagram 23] FIG. 11 is a perspective view of a modified example of the length adjustment jig according to the first embodiment of the present invention. [Figure 24] FIG. 19 is a perspective view of a device for supporting a rectangular plate-shaped weight and adjusting an inclination angle according to a tenth embodiment of the present invention. [Diagram 25] FIG. 23 is a partially enlarged perspective view of an inclination angle adjusting jig of a device for supporting and adjusting the inclination angle of a rectangular plate-shaped weight according to a tenth embodiment of the present invention. [Figure 26] 13 is a partial cross-sectional view taken along line AA of the inclination angle adjusting jig of the device for supporting and adjusting the inclination angle of a rectangular plate-shaped weight according to the tenth embodiment of the present invention. FIG. [Figure 27] 11 is a perspective view of a direction and position adjustment device for a traffic sign T according to an eleventh embodiment of the present invention. FIG. [Figure 28]12 is a perspective view of a modified example of a direction and position adjustment device for a traffic sign T according to the 11th embodiment of the present invention. FIG. [Figure 29] 1 is a table showing test conditions for a limit support load measurement test. [Diagram 30] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Diagram 31] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Diagram 32] 1 is a graph showing the results of a limit support load measurement test, with the vertical axis representing the support load and the horizontal axis representing the displacement. [Diagram 33] 13 is a perspective view of an inner and outer tube around a length adjustment jig according to a modified example of the first embodiment of the present invention. FIG. [Diagram 34] 13 is a side cross-sectional view of an inner and outer tube around a length adjustment jig according to a modified example of the first embodiment of the present invention. FIG. [Diagram 35] 13 is a perspective view of inner and outer tubes around a length adjustment jig according to another modified example of the first embodiment of the present invention. FIG. [Diagram 36] FIG. 20 is a partially enlarged perspective view of the area around the length adjusting jig in FIG. 19. [Figure 37] FIG. 20 is a perspective view of the stand in FIG. 19 in a folded state. [Figure 38] 13 is a side cross-sectional view of an inner and outer tube around a length adjustment jig according to a further modified example of the first embodiment of the present invention. FIG. [Figure 39] 13 is a side cross-sectional view of an inner and outer tube around a length adjustment jig according to a further modified example of the first embodiment of the present invention. FIG. [Diagram 40] 13 is a side cross-sectional view of an inner and outer tube around a length adjustment jig according to a further modified example of the first embodiment of the present invention. FIG. [Explanation of symbols]

[0063] D Distance between a pair of slits W Rectangular plate-shaped heavy object P Plane formed by both support bars θ Tilt angle 10 Length adjustment jig 12 Inner tube 14 Outer tube 15 Outer surface 16 Outer surface 17 Inner surface 18 Through slit 20 Female thread 22 Pressing part 24 Fastening screw 26 Male thread 28 One end 30 Tubular base 32 Stupid Hole 34 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 65 Tubular protrusion 70 Nut 72 Female thread 74 Male thread 76 Coil Spring 78 Protective plate 80 Shallow Groove 82 Elastic part 84 Shelf side fixing part 86 Contact surface 88 Reception Department 89 Contact surface 90 Ceiling side fixing part 92 Contact surface 94 Reception Department 96 Lower end surface 98 Upper end surface 100 Rectangular plate-shaped weight support and tilt angle adjustment device 101 Tilt angle adjustment jig 102 Tubular part 104 First support bar 106 Top 108 Axis 110 Bottom end 112 Second Support Bar 114 Tip surface 116 Pair of overhanging flanges 118 End 120 First through hole 122 Second through hole 124 X-shaped cross member 126 Diagonal Tube 128 holes 130 Long slot 132 Torque applying grip 140 Inner surface 142 External surface

Claims

1. A step of machining, 3D printer modeling, or lost wax processing a pair of through slits and a female screw portion on an outer surface of a solid or hollow inner tube and a hollow outer tube that fit together, the outer surface corresponding to the fitting portion of the outer tube; a pressing portion having a U-shaped cross section, the pressing portion having a clearance hole, the pressing portion penetrating from outside the outer surface into the pair of through slits and capable of being pressed against the outer circumferential surface of the inner tube in a tight contact manner by surface contact at two points, and a tightening screw portion having a female screw portion capable of being screwed into the female screw portion and a torque applying grip for applying rotation around the extension direction of the male screw portion, the torque applying grip having a diameter selected according to the support load so that the load can be firmly supported by hand force alone, and at a predetermined fitting position, by manually tightening the tightening screw portion via a torque-applying grip, the male threaded portion is screwed into the female threaded portion through the clearance hole, thereby pressing and fixing the pressing portion against the outer peripheral surface of the inner tube in a surface contact manner, and pressing and fixing the outer peripheral surface of the inner tube opposite the surface contact portion of the pressing portion with the inner tube against the inner peripheral surface of the outer tube, thereby constituting an overall length adjustment jig for the inner and outer tubes, or a tilt angle adjustment jig that rotatably connects the inner tube and outer tube via a pivot and adjusts the fitting position of the inner tube and outer tube, or a fixed support jig for a stand that supports and fixes a heavy object with either the inner or outer tube, and completing the manufacturing method of an integrated structure of inner and outer tubes, the method comprising the steps of:

2. a tubular portion having an outer circumferential surface including a female screw portion and at least one through hole within a predetermined range from the female screw portion; a first support bar extending at a fixed predetermined angle with respect to the extension direction of the tubular portion and having a lower end grounded; and a pivot connecting an upper end of the first support bar to the tubular portion, the upper end of the first support bar being connected and fixed to the tubular portion so as to be rotatable about the pivot shaft; a second support bar that is slidably fitted into the tubular portion, extends along the extension direction of the tubular portion, and has a lower end that is grounded; At least one pressing portion that passes through the through hole from the outer peripheral surface of the tubular base portion and abuts against the outer peripheral surface of the second support bar; a tightening screw portion capable of pressing and fixing the pressing portion against an outer circumferential surface of the second support bar, The tip surface of the pressing portion is shaped to conform to the outer circumferential surface of the second support bar so as to be in surface contact with the outer circumferential surface of the second support bar, The fastening screw portion has a male screw portion that can be screwed into the female screw portion, the pressing portion has a clearance hole through which the male screw portion can pass, a tilt angle adjusting jig for adjusting a tilt angle of the second support bar relative to a ground surface, the tilt angle being adjusted by adjusting a fitting position of the tubular base portion relative to the second support bar while rotating an upper end of the first support bar around the pivot axis relative to the tubular portion and then threading the male threaded portion into the female threaded portion through the clearance hole with the tightening screw portion while causing the pressing portion to pass through the through hole and pressing and fixing the tip surface against the outer peripheral surface of the second support bar in a surface contact manner.

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

4. The tilt angle adjuster according to claim 2 is provided as a pair such that the planes defined by the support bars are parallel to each other, Each of the opposing edges of the rectangular plate-shaped weight object is supported by the second support bar of each of the tilt angle adjustment devices, and the rectangular plate-shaped weight object is supported at four points by the lower ends of the first support bars and the lower ends of the second support bars of each of the tilt angle adjustment devices, A device for supporting and adjusting the inclination angle of a rectangular plate-shaped weight object, characterized in that the inclination angle of the rectangular surface of the rectangular plate-shaped weight object is adjusted by adjusting the fitting position of the tubular base portion of each of the inclination angle adjustment devices relative to the corresponding second support bar, thereby adjusting the inclination angle of the corresponding second support bar of each of the inclination angle adjustment devices.

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