JP2006249705A - Steplessly length adjusting device in telescopic pipe connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel technology for steplessly adjusting the length, without reducing strength, in a telescopic pipe connection structure formed by slidingly fitting an inner pipe inside an outer pipe. <P>SOLUTION: A pair of elongate holes 3 are oppositely formed in any one of the inner pipe 1 and the outer pipe 2, and a pair of through-holes 4 are oppositely formed in the other pipe. A nonrotatable nut 14 screwed with a screw shaft 5b of a fastening bolt 5 and a fastening pad 13 tiltably fitted around the screw shaft, are arranged inside the inner pipe. The inner pipe is brought into pressure contact with the outer pipe by rotating the fastening bolt in the fastening direction. When a load in the longitudinal direction is applied to the inner pipe, the fastening pad tilts, and increases pressure contact force, and checks its movement, and holds the predetermined length of the telescopic pipe. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a nested pipe connection structure in which an inner pipe is slidably fitted inside an outer pipe, and more specifically, an apparatus capable of continuously adjusting the length of the nested pipe connection structure. About.

A nested pipe connection structure in which an inner pipe is slidably fitted inside an outer pipe is known, and has been adopted for various applications. In the following Patent Document 1, a nested pipe connection structure in which an inner pipe is slidably fitted inside an outer pipe as a fall prevention device for a beam of H-shaped steel or the like temporarily placed in a steel structure construction site. Is used. In this nested pipe connection structure, three through holes are formed in the inner pipe and the outer pipe at predetermined equal intervals, respectively, and the arbitrary through holes of the inner pipe and the arbitrary through holes of the outer pipe are aligned. The length of the inner pipe is adjusted by inserting a fixing pin that can be inserted into and removed from the through hole.
JP 2003-090131 A

  However, in such a method, the length of the inner pipe can be adjusted in several steps by a combination of an arbitrary through hole of the inner pipe and an arbitrary through hole of the outer pipe. Was impossible. In addition, if a large number of through holes are formed in the inner pipe and the outer pipe, it is possible to adjust in multiple stages, but stepless adjustment is still impossible, and there are many in both pipes constituting the nested pipe connection structure. There is also a concern that the strength may be reduced due to the formation of through-holes.

  Therefore, the present invention provides a novel technique for enabling stepless length adjustment without reducing strength in a nested pipe connection structure in which an inner pipe is slidably fitted inside an outer pipe. The issue is to provide.

  In order to solve this problem, the present invention according to claim 1 is directed to a nested pipe connection structure in which an inner pipe is slidably fitted inside an outer pipe. A pair of opposed long holes formed by extending a predetermined length in the axial direction, a pair of opposed through holes formed in the other pipe, and a fastening bolt that can be inserted into and removed from the long holes and the through holes And a tightening pad disposed inside the inner pipe so as to be movable along the tightening bolt, the tightening bolt extending from the head integrally with the head located outside the outer pipe. A screw shaft that protrudes outside the outer pipe on the opposite side through a long hole and a through hole on the side opposite to the head, and a nut fixed to the screw shaft on the opposite side And By rotating the attached bolt in the tightening direction, the tightening pad is moved along the screw shaft through the screwing means with the screw shaft, and the inner pipe is pressed against the outer pipe to give a tightening force. Is a stepless length adjusting device.

  According to a second aspect of the present invention, in the nested pipe connection structure in which the inner pipe is slidably fitted inside the outer pipe, either the inner pipe or the outer pipe has a predetermined length in the axial direction. A pair of opposed long holes formed by extension, a pair of opposed through holes formed in the other pipe, a fastening bolt that can be inserted into and removed from the long hole and the through hole, and a screw of the fastening bolt A fastening pad that is non-rotatably arranged inside the inner pipe while being screwed to the shaft, and a collar that is arranged inside the inner pipe while loosely fitting the screw shaft of the fastening bolt. By rotating the attached bolt in the tightening direction, the tightening pad is moved along the screw shaft through screwing with the screw shaft, and the inner pipe is brought into pressure contact with the outer pipe to give a tightening force. Steplessly to a length adjustment device.

  According to a third aspect of the present invention, in the nested pipe connection structure in which the inner pipe is slidably fitted inside the outer pipe, either the inner pipe or the outer pipe has a predetermined length in the axial direction. A pair of opposed long holes formed by extension, a pair of opposed through holes formed in the other pipe, a fastening bolt that can be inserted into and removed from the long hole and the through hole, and a screw of the fastening bolt A nut that is non-rotatably arranged inside the inner pipe while being screwed to the shaft, and a tightening that is arranged inside the inner pipe so that it can be tilted with respect to the screw shaft of the tightening bolt. The nut is moved along the screw shaft by screwing with the screw shaft by rotating the tightening bolt in the tightening direction, and thereby the inner pad is moved by the tightening pad moving in the same direction. Stepless length adjusting device which is pressed against the up to the outer pipe characterized in providing a clamping force.

  According to a fourth aspect of the present invention, in the stepless length adjusting device in the nested pipe connection structure according to any one of the first to third aspects, the surface of the fastening pad that contacts the nut is formed in a spherical shape. It is characterized by being.

  According to a fifth aspect of the present invention, in the stepless length adjusting device in the nested pipe connection structure according to any one of the first to fourth aspects, the surface of the fastening pad that contacts the inner pipe is formed in a spherical shape. It is characterized by.

  According to a sixth aspect of the present invention, in the stepless length adjusting device in the nested pipe connection structure according to any one of the first to fifth aspects, the surface of the fastening pad on the side in contact with the inner pipe is for preventing slippage. Engagement teeth are provided.

  According to the first aspect of the present invention, by rotating the tightening bolt in the tightening direction, the tightening pad is moved along the screw shaft through the screwing means with the screw shaft, and the inner pipe is moved to the outer pipe. Since it is pressed against the outer pipe to give a tightening force, even if a load that pulls the inner pipe out of the outer pipe or an axial load that pushes it into the outer pipe is applied, the movement is prevented and the specified length Can be held.

  According to the second aspect of the present invention, by rotating the tightening bolt in the tightening direction, the tightening pad is moved along the screw shaft through screwing with the screw shaft, and the inner pipe is turned into the outer pipe. Since the clamping force is applied by pressure contact, even if a load that pulls the inner pipe out of the outer pipe or an axial load that pushes it into the outer pipe is applied, the movement is prevented and the specified length is reduced. Can be held.

  According to the third aspect of the present invention, the nut is moved along the screw shaft by screwing with the screw shaft by rotating the tightening bolt in the tightening direction, and thereby the tightening bolt is moved in the same direction. Since the inner pipe is pressed against the outer pipe with the attached pad to give a tightening force, even if a load is applied to pull the inner pipe out of the outer pipe or an axial load to be pushed into the outer pipe, the movement Can be prevented and the prescribed length can be maintained. In addition, the fastening pad is installed inside the inner pipe so that it can be tilted with respect to the screw shaft of the fastening bolt, so that the inner pipe is pushed into the outer pipe or the load to pull out the inner pipe from the outer pipe. When an axial load is applied, the clamping pad tilts with respect to the screw shaft, and the pressure contact force against the inner surface of the inner pipe increases on one side of the screw shaft and the pressure contact with the nut on the other side. The force increases, and the effect of preventing the relative movement of the inner pipe and maintaining the specified length is more strongly exhibited.

  According to the fourth aspect of the present invention, the surface of the fastening pad that comes into contact with the nut is formed in a spherical shape. Therefore, when the fastening pad is tilted, the contact area with the nut is ensured and the pressure contact force is secured. Can be increased.

  According to the fifth aspect of the present invention, since the surface of the fastening pad that contacts the inner pipe is formed in a spherical shape, the contact area with the inner pipe is ensured when the fastening pad is tilted. The pressure contact force can be increased.

  According to the present invention of claim 6, since the engagement teeth for preventing slippage are provided on the surface of the fastening pad that contacts the inner pipe, the pressure contact force can be increased by meshing with the inner pipe. it can.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show an embodiment in which a stepless length adjusting device having a nested pipe connection structure according to the present invention is applied to a beam overturn prevention device 10. FIG. The inner pipe 1 is slidably fitted into the outer pipe 2 to constitute a telescopic pipe structure 11 that can be expanded and contracted. In this embodiment, the inner pipe 1 and the outer pipe 2 are both shown as square pipes. However, any shape can be used as long as the pipes 1 and 2 can be formed as long as they can form a sliding fit. Both may be round pipes.

  Either one of the inner pipe 1 and the outer pipe 2 is formed with a long hole extending in the length direction so as to face the predetermined length, and the other pipe is formed with a through hole facing it. In this embodiment, a long hole 3 extending a predetermined length (L2) in the length direction is formed in the inner pipe 1, and a through hole 4 is formed near the tip of the outer pipe 2. The long hole 3 and the through hole 4 have a width and a diameter through which the shaft of the tightening bolt 5 can be inserted. 1 and 2 show a state in which the outer pipe 2 is connected to the outer pipe 2 by a fastening bolt 5 at a substantially intermediate position of the long hole 3 of the inner pipe 1, and the length L1 of the nested pipe connection structure 11 at this time is shown. Has an intermediate length.

  A screw-type clamp 8 is rotatably connected to the outer end (left end in the figure) of the inner pipe 1 via a connecting means 6, and the connecting means 7 is connected to the outer end (right end in the figure) of the outer pipe 2. A screw-type clamp 9 is rotatably connected to each other. The screw type clamps 8 and 9 can clamp a beam of H-shaped steel or the like to be prevented from falling by using the fall prevention device 10 as will be described later. Omit.

  This beam overturn prevention device sets the clamps 8 and 9 on the flange 12a (FIG. 7) and the web 12b (FIG. 8) of the H-shaped steel 12 temporarily placed in an upright state at intervals, and the overturn is prevented. Used to prevent. This usage is the same as that described in the above-mentioned Patent Document 1, and since it is not directly related to the subject of the present invention, further detailed description is omitted. It is necessary to adjust the length L1 of the nested pipe connection structure 11 according to the temporary placement interval of the H-section steel 12, and a stepless adjustment device for this will be described in detail below with reference to FIGS. .

  The fastening bolt 5 includes a head 5a that can be rotated with a hexagon wrench, a screw shaft 5b that is loosely fitted into the long hole 3 of the inner pipe 1 and the through hole 4 of the outer pipe 2, and a screw shaft 5b. It consists of a fixing nut 5c attached to the tip. The opening width of the long hole 3 of the inner pipe 1 and the diameter of the through hole 4 of the outer pipe 2 are both larger than the thread diameter of the screw shaft 5b. Inside the inner pipe 1, a nut 14 to be screwed with the screw shaft 5 b and an outer fitting so as to allow relative rotation to the screw shaft 5 b on one side of the nut 14 and allow a slight swing or tilt. A fastening pad 13 is arranged. The length L3 of the fastening pad 13 in the longitudinal axis direction (inner pipe moving direction) is formed larger than the inner dimension L5 of the inner pipe 1, and the width direction length L4 of the fastening pad 13 is larger than the inner pipe inner dimension L5. Since it is formed slightly smaller (L3> L5> L4), the fastening pad 13 can be moved in the axial direction along the screw shaft 5b in the inner pipe 1, but is accommodated in a non-rotatable manner with respect to the screw shaft 5b. Has been. A plurality of engaging teeth 13 a are concentrically provided on the spherical tip surface (upper end surface in the drawing) of the fastening pad 13.

  When assembling, the through hole 4 of the outer pipe 2 is aligned at an arbitrary position in the length range of the long hole 3 of the inner pipe 1, and the screw shaft 5b is inserted from one side with the fixing nut 5c removed. The nut 5c is inserted into the shaft insertion hole 13b of the fastening pad 13 inserted into the inner pipe 1 and threaded through the nut 14, and the fixed nut 5c is attached to the tip of the shaft protruding to the other side so that it cannot be removed. Fix it. The state (open state) at this time is shown in FIG. 3, and the nut 14 is in contact with the inner surface of the inner pipe 1 on one side 1 a, but the tip engaging tooth 13 a of the fastening pad 13 is on the other side. It is far from 1b. In this state, the inner pipe 1 and the outer pipe 2 can be moved relative to each other and expanded and contracted, and stepless length adjustment is possible.

  After arbitrarily positioning the inner pipe 1 and the outer pipe 2 and adjusting the required length, when the tightening bolt 5 is rotated in the tightening direction from this state, it is screwed into the screw shaft portion 5b. The nut 14 gradually moves toward the other side 1 b of the inner pipe 1, and accordingly, the fastening pad 13 also moves in the same direction. Finally, the tip engaging teeth 13 a are connected to the inner surface of the inner pipe 1. The state shown in FIG. 4 (locked state) is obtained in which the inner pipe 1 is pressed against the outer pipe 2 and locked. In this state, when the inner pipe 1 tries to move in any direction (for example, the X direction) with respect to the outer pipe 2, as shown in FIG. The tightening pad 13 that is in contact tilts in the X direction within a range permitted by the shaft insertion hole 13b larger than the thread diameter of the screw shaft 5b. As a result, the tip engaging teeth 13a of the fastening pad 13 are more strongly engaged with the inner surface 1b of the inner pipe 1 on the opposite side to the X direction of the screw shaft 5b, and the fastening pad is placed on the X direction side of the screw shaft 5b. 13 is more strongly pressed against the nut 14, so that the force (clamping force) for pressing the inner pipe 1 against the outer pipe 2 is increased to prevent the relative movement of the inner pipe 1 and nesting. The desired length L1 set as the pipe connection structure 11 can be held stationary.

  This principle will be further described with reference to FIG. 6. When the fastening pad 13 is tilted by the rising dimension σ by moving the inner pipe 1 in the X direction with respect to the outer pipe 2, the X direction of the inner pipe 1. When the movement energy is W, the length of the region (length from the fulcrum) where the tip engagement tooth 13a of the fastening pad 13 contacts the inner surface 1b of the inner pipe 1 is L6, and the effective thickness of the fastening pad 13 is L7. The generated tightening force f can be expressed by f = (L7 / L6) × W. That is, as the load W for moving the inner pipe 1 in the X direction increases, the tightening force f increases and the movement of the inner pipe 1 can be prevented. Note that the base surface 13c of the fastening pad 13 is formed in a spherical shape as shown in the figure so as to ensure a contact area with the nut 14 when the fastening pad 13 is tilted.

  Even after the inner pipe 1 is fixed to the outer pipe 2 so as to be immovable and the nested pipe connection structure 11 having a predetermined length L1 is formed, if the length is to be changed, tightening is performed. The bolt 5 is loosened to change from the locked state of FIG. 4 to the open state of FIG. 3. In this open state, the inner pipe 1 is pushed or pulled out into the outer pipe 2 to have an arbitrary desired length, and then the tightening bolt 5 is again attached. It may be tightened to the locked state shown in FIG. Thus, the length L1 of the nested pipe connection structure 11 can be arbitrarily and easily adjusted steplessly within a range in which the long hole 3 of the inner pipe 1 and the through hole 4 of the outer pipe 2 are aligned. In addition, it can be locked to its length and held immobile.

  9 and 10 show the configuration and operation of a stepless length adjusting device for a nested pipe connection structure according to another embodiment of the present invention. Since the inner pipe 1 and the outer pipe 2 constituting the nested pipe connection structure 11 are the same as those in the first embodiment, the description thereof is omitted. Further, the structure of the fastening bolt 5 itself composed of the head portion 5a, the screw shaft 5b, and the fixing nut 5c is the same as that of the embodiment, but a member disposed inside the inner pipe 1 in relation to the fastening bolt 5 Since these are different in structure and operation, they will be described in detail below.

  Inside the inner pipe 1, a collar 16 that is loosely fitted to the screw shaft 5b of the tightening bolt 5 is provided on one side 1a of the inner surface, and the other inner surface side 1b is screwed to the screw shaft 5b. A clamping pad 15 is arranged. The length L8 of the fastening pad 15 in the longitudinal direction (inner pipe moving direction) is formed larger than the inner dimension L10 of the inner pipe 1, and the width direction length L9 is formed slightly smaller than the inner pipe inner dimension L10. (L8> L10> L9), the fastening pad 15 is movable in the axial direction along the screw shaft 5b in the inner pipe 1, but is accommodated non-rotatably with respect to the screw shaft 5b. Further, the plurality of engaging teeth 15a are provided concentrically on the horizontal front end surface (upper end surface in the drawing) of the tightening pad 15, which is substantially the same as the tightening pad 13 of the first embodiment. However, the base surface 15 c of the fastening pad 15 is a flat surface to ensure engagement with the collar 16.

  When assembling, the through hole 4 of the outer pipe 2 is aligned at an arbitrary position in the length range of the long hole 3 of the inner pipe 1, and the screw shaft 5b is inserted from one side with the fixing nut 5c removed. Threaded through the screw hole 15b of the fastening pad 15 inserted into the inner pipe 1 and inserted through the collar 16, and fixed to the shaft tip protruding to the other side by attaching a fixing nut 5c so that it cannot be removed. . The state (open state) at this time is shown in FIG. 9, and the collar 16 is in contact with the inner surface of the inner pipe 1 on one side 1a, but the tip engaging teeth 15a of the fastening pad 15 are on the other side. It is far from 1b. In this state, the inner pipe 1 and the outer pipe 2 can be moved relative to each other and expanded and contracted, and stepless length adjustment is possible.

  After arbitrarily positioning the inner pipe 1 and the outer pipe 2 and adjusting the required length, when the tightening bolt 5 is rotated in the tightening direction from this state, it is screwed into the screw shaft portion 5b. The fastening pad 15 gradually moves toward the other side 1b of the inner pipe 1, and finally its tip engaging tooth 15a meshes with the inner surface of the inner pipe 1, and the inner pipe 1 is pressed against the outer pipe 2 to be locked. The state shown in FIG. 10 (locked state) is obtained. Even if the inner pipe 1 tries to move in any direction with respect to the outer pipe 2 in this locked state, the tip engaging teeth 13a of the fastening pad 13 are engaged with the inner surface 1b of the inner pipe 1, and the inner pipe 1 is moved. Since the tightening force is generated by pressing against the outer pipe 2, the movement of the inner pipe 1 can be prevented, and the desired length L <b> 1 set as the nested pipe connection structure 11 can be held stationary. it can.

  Even after the inner pipe 1 is fixed to the outer pipe 2 so as to be immovable and the nested pipe connection structure 11 having a predetermined length L1 is formed, if the length is to be changed, tightening is performed. The bolt 5 is loosened to change from the locked state of FIG. 10 to the open state of FIG. 9. In this open state, the inner pipe 1 is pushed or pulled out into the outer pipe 2 to have an arbitrary desired length, and then the tightening bolt 5 is tightened again. It may be tightened to the locked state shown in FIG. Thus, the length L1 of the nested pipe connection structure 11 can be arbitrarily and easily adjusted steplessly within a range in which the long hole 3 of the inner pipe 1 and the through hole 4 of the outer pipe 2 are aligned. In addition, it can be locked to its length and held immobile.

  The present invention is not limited to the first and second embodiments described above, and can take various embodiments within the scope of the invention defined by the claims. For example, the fastening pads 13 and 15 of the first and second embodiments have a plurality of engaging teeth 15a formed concentrically on the tip surface, but are not necessarily concentric, and may be parallel or grid-like. Engagement teeth may be formed.

It is a top view which shows the fall prevention apparatus of the beam to which the stepless length adjustment apparatus of the nested pipe connection structure by one Embodiment of this invention is applied. It is a side view which shows the part of the stepless length adjustment apparatus of this fall prevention apparatus. It is principal part sectional drawing (A) and end elevation (B) when the continuously variable length adjusting device by this embodiment exists in an open state. They are a principal part sectional view (A) and end view (B) when the continuously variable length adjusting device according to this embodiment is in a locked state. FIG. 5 is a cross-sectional view of a main part showing an operation when a load is applied to the inner pipe to move relative to the outer pipe in the locked state of FIG. 4. FIG. 6 is an operation explanatory view similar to FIG. 5. It is explanatory drawing which shows the example of this fall prevention apparatus. It is explanatory drawing which shows the other example of this fall prevention apparatus. It is principal part sectional drawing (A) and end elevation (B) when the stepless length adjustment apparatus by another embodiment of this invention exists in an open state. They are a principal part sectional view (A) and end view (B) when the continuously variable length adjusting device according to this embodiment is in a locked state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner pipe 2 Outer pipe 3 Long hole 4 Through hole 5 Clamping pin 5a Head 5b Screw shaft 5c Fixing nut 6,7 Connection means 8,9 Screw type clamp 10 Beam fall prevention device 11 Nested pipe connection structure 12H Shaped steel 13 Clamping pad 13a Tip engagement tooth 13b Shaft insertion hole 13c Spherical base surface 14 Nut 15 Clamping pad 15a Tip engagement tooth 15b Screw hole 15c Flat base surface 16 Collar

Claims (6)

In a nested pipe connection structure in which an inner pipe is slidably fitted inside an outer pipe, a pair of opposing members formed by extending a predetermined length in the axial direction of either the inner pipe or the outer pipe A pair of opposed through holes formed in the other pipe, a fastening bolt that can be inserted into and removed from the long hole and the through hole, and an inner pipe that is movable along the fastening bolt. A tightening bolt disposed on the outer side of the outer pipe, and a bolt extending integrally from the head to the long hole and the through hole on the head side and the opposite side of the head. Having a screw shaft that protrudes outside the outer pipe on the opposite side through the long hole and the through-hole, and a nut fixed to the screw shaft on the opposite side, and rotating the tightening bolt in the tightening direction By screw Stepless length adjustment in a nested pipe connection structure characterized in that the fastening pad is moved along the screw shaft via a screwing means and the inner pipe is pressed against the outer pipe to give a fastening force. apparatus. In a nested pipe connection structure in which an inner pipe is slidably fitted inside an outer pipe, a pair of opposing members formed by extending a predetermined length in the axial direction of either the inner pipe or the outer pipe An elongated hole, a pair of opposing through holes formed in the other pipe, a fastening bolt that can be inserted into and removed from the elongated hole and the through hole, and an inner screwed to the screw shaft of the fastening bolt. A tightening pad that is non-rotatably disposed inside the pipe and a collar that is disposed inside the inner pipe with the screw shaft of the tightening bolt loosely fitted therein, and rotates the tightening bolt in the tightening direction. Nested pipe connection characterized in that the tightening pad is moved along the screw shaft through screwing with the screw shaft, and the inner pipe is pressed against the outer pipe to give a tightening force. Stepless length adjustment device in concrete. In a nested pipe connection structure in which an inner pipe is slidably fitted inside an outer pipe, a pair of opposing members formed by extending a predetermined length in the axial direction of either the inner pipe or the outer pipe An elongated hole, a pair of opposing through holes formed in the other pipe, a fastening bolt that can be inserted into and removed from the elongated hole and the through hole, and an inner screwed to the screw shaft of the fastening bolt. A nut arranged non-rotatably inside the pipe, and a clamping pad arranged inside the inner pipe so as to be tiltable with respect to the screw shaft of the clamping bolt. By rotating in the tightening direction, the nut is moved along the screw shaft through screwing with the screw shaft, and thereby the inner pipe is pressed against the outer pipe by the tightening pad moving in the same direction. Stepless length adjustment device in telescopic pipe connection structure characterized by providing a clamping force by. 4. The stepless length adjusting device for a nested pipe connection structure according to claim 1, wherein a surface of the fastening pad that contacts the nut is formed in a spherical shape. The stepless length adjusting device in the nested pipe connection structure according to any one of claims 1 to 4, wherein a surface of the fastening pad on the side in contact with the inner pipe is formed in a spherical shape. 6. The stepless length in the nested pipe connection structure according to any one of claims 1 to 5, wherein an engagement tooth for preventing slippage is provided on a surface of the fastening pad in contact with the inner pipe. Adjustment device.

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