JP2014073772A - Height adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a height adjustment device so as to increase stroke thereof.SOLUTION: A height adjustment device M comprises: a strut member 1 which comprises multiple cases 2, 3, 4 connected to one another so as to be slidable in an axial direction, and which can perform telescopic motion while respective cases 2, 3, 4 being prevented from relative rotation; and a feeding screw mechanism 5 which is housed in the strut member 1 and drives the telescopic motion of the strut member 1. The strut member 1 comprises: the above-said three cases 2, 3, 4, and the feeding screw mechanism 5 comprises: one bolt member 6 on the outer periphery of which a screw groove is formed, one nut member 8 which is formed in a cylindrical shape and has screw grooves formed on the outer periphery and the inner periphery thereof. A hollow bolt 7 is engaged with the outer periphery of the bolt member 6, and the nut member 8 is engaged with the outer periphery of the hollow bolt 7, whereby the bolt member 6 and the strut member 1 are prevented from relative rotation, while relative rotation of the nut member 8 and the strut member 1 is permitted.

Description

  The present invention relates to an improvement of a height adjusting device.

  For example, as disclosed in Patent Document 1, the height adjusting device is used in a tire holding device or the like for exchanging and transporting airplane tires.

  The tire holding device includes a frame serving as a skeleton, a pair of support rollers (loading rollers 8 in Patent Document 1) that are rotatably attached to the frame and support the tire from below, and are disposed above the support rollers. And a support bar (the same hook 18) that prevents the tire loaded on the support roller from falling, and the height of the support bar is adjusted by attaching the support bar to the frame via a height adjusting device. By changing the distance between the tire and the support bar, tires having different diameters can be held by one tire holding device.

  As shown in FIG. 9, the height adjusting device A <b> 1 is composed of two cases 200 and 400 that are slidable in the axial direction and is telescopically extended and retracted, and is accommodated in the column member 100. A feed screw mechanism 500 that expands and contracts the column member 100 and a handle H that drives the feed screw mechanism 500 are provided.

  Of the two cases 200 and 400 constituting the column member 100, the outer case 200 located on the outer side is arranged on the upper side, and a support bar (not shown) of the tire holding device is held on the side surface. . On the other hand, the inner case 400 positioned on the inner side is disposed on the lower side and inserted into the outer case 200 so as to be able to appear and retract, and is connected to a frame (not shown) of the tire holding device. Furthermore, each cross section of the outer case 200 and the inner case 400 is formed in a rectangular frame shape, so that the outer case 200 and the inner case 400 cannot be rotated relative to each other.

  Further, the feed screw mechanism 500 includes a single bolt member 600 having a screw groove formed on the outer periphery and a nut member 800 formed in a cylindrical shape and having a screw groove formed on the inner periphery. A handle H is attached to the nut member 800. The bolt member 600 stands up at the center of the outer case 200 and is prevented from rotating relative to the outer case 200. The nut member 800 stands up at the center of the inner case 400 and is allowed to rotate relative to the inner case 400. Yes.

  Therefore, when the operator holds the handle H and rotates the nut member 800, the rotation of the bolt member 600 is prevented by the support member 100, so that the bolt member 600 linearly moves in the axial direction as the nut member 800 rotates. Then, the outer case 200 can move together with the bolt member 600 and the support member 100 can expand and contract, and the height of the support bar can be adjusted.

  When the height adjusting device A1 includes the feed screw mechanism 500 as described above, the height adjusting device A1 is configured such that the inner case 400 is withdrawn from the outer case 200 to the maximum and the bolt member 600 is maximum from the nut member 800. The stroke can be made from the fully extended state where the bolt member 600 is fully retracted to the fully contracted state where the inner case 400 enters the outer case 200 as much as possible and the bolt member 600 enters the nut member 800 as much as possible.

JP 2003-019918 A

  Here, in order to change only the conventional height adjusting device A1 and hold the tire having a smaller diameter in the tire holding device, the axial direction at the time of the most contraction is maintained while maintaining the axial length at the time of the maximum extension. It is necessary to increase the strokes of the support member 100 and the feed screw mechanism 500 so that only the length is shortened.

  Similarly, in order to change only the conventional height adjusting device A1 and to allow the tire holding device to hold a tire having a larger diameter, the axial direction at the maximum extension is maintained while maintaining the axial length at the time of the maximum contraction. It is necessary to increase the strokes of the support member 100 and the feed screw mechanism 500 so that only the length becomes longer.

  However, the stroke of the support member 100 depends on the axial length of the outer case 200 and the stroke of the feed screw mechanism 500 depends on the axial length of the bolt member 600. If the axial lengths of the outer case 200 and the bolt member 600 are shortened in order to shorten the length, the stroke becomes small, and the axial length at the time of maximum extension of the height adjusting device A1 is insufficient.

  Further, when the axial length of the outer case 200 or the bolt member 600 is increased to increase the axial length at the maximum extension, the stroke increases, but the axial length at the maximum contraction of the height adjusting device A1. Becomes longer, and it becomes impossible to hold a tire having a small diameter which has been conventionally held.

  That is, in the conventional height adjusting device A1, only the axial length at the time of the most contraction is shortened while maintaining the axial length at the time of the maximum extension, or the axial length at the time of the most contraction is maintained. However, it is difficult to increase the stroke so that only the axial length at the time of maximum extension becomes longer.

  Accordingly, an object of the present invention is to reduce only the axial length at the time of the most contraction while maintaining the axial length at the time of the maximum extension, or at the time of the maximum extension while maintaining the axial length at the time of the most contraction. It is to provide a height adjusting device capable of increasing the stroke so that only the length in the axial direction is increased.

  Means for solving the above-mentioned problems are a column member that is composed of a plurality of cases that are slidable in the axial direction and that telescopically expands and contracts and prevents relative rotation of each case, and is accommodated in the column member. And a feed screw mechanism for expanding and contracting the support member, wherein the support member comprises three or more cases, and the feed screw mechanism has a single screw groove formed on the outer periphery. Bolt member, one nut member formed in a cylindrical shape and having a screw groove on the inner periphery, and one or more hollow bolts formed in a cylindrical shape and formed in the outer periphery and the inner periphery. The hollow bolt is screwed to the outer periphery of the bolt member, and the other hollow bolt or the nut member is screwed to the outer periphery of the hollow bolt, and the bolt member or the nut Relative rotation of the one and the strut member of the wood is prevented, is that the relative rotation between the other and the strut member of the bolt member or the nut member is allowed.

  According to the present invention, only the axial length at the time of the most contraction is shortened while maintaining the axial length at the time of the maximum extension, or the shaft at the maximum extension while maintaining the axial direction length at the time of the most contraction. It is possible to increase the stroke of the height adjusting device so that only the length in the direction becomes longer.

It is the longitudinal cross-sectional view which showed the height adjustment apparatus which concerns on one embodiment of this invention. It is the side view which showed the state which attached the height adjustment apparatus which concerns on one embodiment of this invention to the tire holding device. It is the front view which notched and showed the height adjustment apparatus which concerns on one embodiment of this invention partially. It is the longitudinal cross-sectional view which expanded and showed the nut member of the height adjustment apparatus which concerns on one embodiment of this invention. (A) is the front view which expanded the hollow volt | bolt of the height adjustment apparatus which concerns on one embodiment of this invention, and showed it partially notching. (B) is the front view which expanded and showed the notch of the stopper of the height adjustment apparatus which concerns on one embodiment of this invention. (C) is a top view of (b). It is the front view which expanded and showed the bolt member of the height adjustment apparatus which concerns on one embodiment of this invention. It is explanatory drawing which showed the shrinkage | contraction process of the height adjustment apparatus which concerns on one embodiment of this invention, (a) shows the state at the time of the maximum expansion | extension of a height adjustment apparatus, (b) is (a). (C) shows the state at the time of the maximum contraction of the height adjusting device. It is explanatory drawing which showed the expansion | extension process of the height adjustment apparatus which concerns on one embodiment of this invention, (a) shows the state at the time of the maximum contraction of a height adjustment apparatus, (b) shows (a). The figure shows the state extended by one stage from (c), and (c) shows the maximum extension state of the height adjusting device. It is the longitudinal cross-sectional view which showed the conventional height adjustment apparatus.

  Hereinafter, a height adjusting device according to an embodiment of the present invention will be described with reference to the drawings. The same reference numerals used throughout the several drawings indicate the same parts.

  As shown in FIG. 1, the height adjusting device A according to the present embodiment is composed of a plurality of cases 2, 3, and 4 that are slidable in the axial direction, and telescopically expands and contracts. 4 is provided with a support member 1 in which relative rotation of the support member 4 is prevented, and a feed screw mechanism 5 that is accommodated in the support member 1 and expands and contracts the support member 1.

  Further, the support member 1 includes three cases (an outer case 2, an intermediate case 3, and an inner case 4). The feed screw mechanism 5 includes a single bolt member 6 having a screw groove on the outer periphery, a nut member 8 having a cylindrical shape and a screw groove on the inner periphery, and a cylindrical shape. And a single hollow bolt 7 in which screw grooves are formed on the outer periphery and inner periphery.

  Then, the hollow bolt 7 is screwed to the outer periphery of the bolt member 6, and the nut member 8 is screwed to the outer periphery of the hollow bolt 7, and relative rotation between the bolt member 6 and the column member 1 is performed. The relative rotation between the nut member 8 and the column member 1 is allowed.

  Hereinafter, in detail, the height adjusting device A according to the present embodiment is used in a tire holding device M that holds a large tire W used in an airplane, as shown in FIG. The tire holding device M is loaded on a loading platform of a tire replacement vehicle (not shown) while holding the tire W, and is used for transporting the tire W or exchanging the tire W. .

  The tire holding device M includes a frame F that is a skeleton of the tire holding device M, a pair of support rollers R1 and R2 that are rotatably attached to the frame F and support the tire W from below, The support bar B is disposed on the upper side of the support rollers R1 and R2 and prevents the tire W from falling to the opposite side of the frame (left side in FIG. 2) and falling, and the height adjustment is performed between the support bar B and the frame F. Device A is interposed.

  That is, since the support bar B is supported by the height adjusting device A and is connected to the frame F via the height adjusting device A, the upper support bar can be expanded and contracted by expanding and contracting the height adjusting device A. The distance between B and the lower support rollers R1 and R2 can be adjusted. For this reason, tires W having different diameters can be held by one tire holding device M. Further, the support bar B can slide in the horizontal direction (left and right direction in FIG. 2) with respect to the support rollers R1 and R2, and the tires W having different thicknesses are held by one tire holding device M. be able to.

  In FIG. 2, a state where the tire holding device M holds the tire W having a small diameter and a small thickness is shown by a solid line, and a state where the tire W having a large diameter and a large thickness is held by the tire holding device M. It is indicated by a two-dot chain line.

  Subsequently, as described above, the height adjusting device A includes the support member 1 that telescopically expands and contracts, and the feed screw mechanism 5 that is accommodated in the support member 1 and expands and contracts the support member 1. A handle H is provided as a driving means for driving the feed screw mechanism 5 (FIG. 1). The height adjusting device A of the present embodiment can adjust the height of the support bar B by expanding and contracting by manually rotating the handle H. However, the feed screw mechanism 5 is electrically operated by a motor or the like. The driving means may be driven by a well-known method as appropriate.

  As shown in FIGS. 1 and 3, the strut member 1 includes an outer case 2 disposed on the outer side, an intermediate case 3 inserted into the outer case 2 so as to be able to appear and retract, and an inner case 3. It consists of an inner case 4 inserted so as to be able to appear and retract, and is composed of three cases 2, 3, and 4. The inner case 4, the intermediate case 3, and the outer case 2 are arranged in this order from the handle side (the lower side in FIGS. 1 and 3). The inner case 4 is connected to the frame F, and the support bar is attached to the outer case 2. B is held. The direction seen from the side opposite to the tire (indicated by an arrow X in FIG. 2) is “front”, “rear”, “left”, “right”, “up”, and “down” of the height adjustment device A.

  As shown in FIG. 3, the inner case 4 includes front and rear plates 40 and 41 that are arranged at the front and rear and formed wide, and left and right plates 42 and 43 that are arranged at the left and right and formed narrow. It is formed in a hollow quadrangular prism shape and has a rectangular frame shape in cross section. A nut member 8 is disposed at the center of the inner case 4.

  A bearing case 44 is accommodated inside the lower end portion (on the side opposite to the intermediate case) of the inner case 4, and a bearing 45 that rotatably supports the nut member 8 on the bearing case 44 (FIG. 1). ) Is arranged. Thereby, the nut member 8 can rotate in the inner case 4 around the center line of the inner case 4 (the column member 1), and is allowed to rotate relative to the support member 1.

  Furthermore, the inner case 4 is welded and fixed to the outer surfaces of the left and right plates 42 and 43, and a pair of stopper pieces 46 are disposed along the horizontal direction on the upper side (intermediate case side) of the left and right plates 42 and 43, respectively. , 46 are provided.

  Further, a circular recess 40a is formed on the outer side of the front plate 40 in the inner case 4 on the lower side (anti-intermediate case side), and an elliptical hole 40b is formed in the center of the recess 40a. Yes. And this hole 40b functions as a working hole for inserting a stopper 73, which will be described later, into the nut member 8 together with a hole 81a of the nut member 8, which will be described later, and mounting the stopper 73 is completed. Then, it is closed with a plate-shaped lid (not shown). The lid is attached to the recess 40a and is formed thinner than the depth of the recess 40a, so that the lid does not protrude from the outer surface of the front plate 40.

  Subsequently, the intermediate case 3 includes the front and rear plates 30 and 31 that are arranged in the front and rear and formed wide, and the left and right plates 32 that are arranged in the left and right and formed narrow in the same manner as the inner case 4. , 33 and is formed in a hollow quadrangular prism shape and has a rectangular frame shape in cross section.

  Further, the inner periphery of the body portion (not shown) of the intermediate case 3 made up of the front, rear, left and right plates 30, 31, 32, 33 is the body portion of the inner case 4 made up of the front, rear, left and right plates 40, 41, 42, 43 It is formed slightly larger than the outer periphery (not shown). The outer surfaces of the front and rear plates 40 and 41 of the inner case 4 are in sliding contact with the inner surfaces of the front and rear plates 30 and 31 of the intermediate case 3. For this reason, the inner case 4 can appear and disappear in the intermediate case 3 without rattling, and telescopically expands and contracts, and the relative rotation between the intermediate case 3 and the inner case 4 is prevented.

  Further, the intermediate case 3 is welded and fixed to the outer surfaces of the left and right plates 32 and 33, and a pair of stopper pieces disposed along the horizontal direction on the upper side (outer case side) of the left and right plates 32 and 33, respectively. 34, 34 and a pair of hooking pieces 35, 35 that protrude inwardly of the left and right plates 32, 33 and are respectively arranged along the horizontal direction on the lower side (inner case side) of the left and right plates 32, 33. Yes.

  The hook pieces 35 and 35 are attached to the left and right plates 32 and 33 from the outer side of the intermediate case 3 and are disposed below the stopper pieces 46 and 46 in the inner case 4 (on the side opposite to the intermediate case). Yes. For this reason, when the inner case 4 is retracted from the intermediate case 3 by a predetermined amount, the hook pieces 35 and 35 of the intermediate case 3 come into contact with the stopper pieces 46 and 46 of the inner case 4 and the inner case 4 is completely removed from the intermediate case 3. This can be prevented.

  Subsequently, the outer case 2 is, like the inner case 4 and the intermediate case 3, front and rear plates 20 and 21 that are arranged in the front and rear and formed wide, and arranged in the left and right and formed in a narrow width. The left and right plates 22 and 23 are formed in a hollow quadrangular prism shape and the cross section has a rectangular frame shape. A bolt member 5 is disposed at the center of the outer case 2.

  Further, the inner periphery (not shown) of the main body portion (not shown) of the outer case made up of the front, rear, left and right plates 20, 21, 22, 23 is the main body portion ( It is formed slightly larger than the outer periphery of (not shown). The outer surfaces of the plates 30 and 31 before and after the intermediate case 3 are in sliding contact with the inner surfaces of the plates 20 and 21 before and after the outer case 2. For this reason, the intermediate case 3 can be projected and retracted in the outer case 2 without rattling and telescopically expanded and contracted, and the relative rotation between the outer case 2 and the intermediate case 3 is prevented.

  Further, the upper side (anti-intermediate case side) opening of the outer case 4 is closed by the upper plate 24. The upper plate 24 is provided with a pair of sandwiching pieces 24a and 24b (FIG. 1) that stand to face each other toward the inside of the outer case 2, and the bolt member 6 is interposed between the sandwiching pieces 24a and 24b. The upper end (base) of the is fixed. For this reason, relative rotation between the bolt member 6 and the outer case 2 (the column member 1) is prevented.

  Further, the outer case 2 includes a pair of hooking pieces 25 and 25 that protrude inward from the left and right plates 22 and 23 and are respectively disposed along the horizontal direction below the left and right plates 22 and 23 (intermediate case side). I have.

  The hook pieces 25 and 25 are attached to the left and right plates 22 and 23 from the outside of the outer case 2 and are disposed below the stopper pieces 34 and 34 in the intermediate case 3 (inner case side). . For this reason, when the intermediate case 3 is retracted from the outer case 2 by a predetermined amount, the hook pieces 25, 25 of the outer case 2 come into contact with the stopper pieces 34, 34 of the intermediate case 3, and the intermediate case 3 is completely removed from the outer case 2. This can be prevented.

  In addition, a handle 26 is attached to the outer surface of the front plate 20 in the outer case 2 so that an operator can grasp the handle 26 when replacing the tire W.

  The feed screw mechanism 5 that returns and expands and contracts the support member 1 includes the bolt member 6, the hollow bolt 7, and the nut member 8 as described above, and the hollow bolt 7 is screwed onto the outer periphery of the bolt member 6. The nut member 8 is screwed onto the outer periphery of the hollow bolt 7, and the nut member 8, the hollow bolt 7, and the bolt member 6 are arranged in this order from the lower side (frame side) and along the center line of the support member 1. Standing up.

  As shown in FIG. 4, the nut member 8 includes an annular nut portion 80 that is arranged on the upper side (hollow bolt side) and has a screw groove formed on the inner periphery, and a lower side (reverse side) of the nut portion 80. A cylindrical tube portion 81 that is coaxially connected to the hollow bolt side) and has an inner diameter r2 that is slightly larger than the inner diameter r1 of the nut portion 80. Further, a base end member 82 is attached to the lower side (anti-hollow bolt side) of the nut member 8, and the lower end (anti-hollow bolt side) opening of the nut member 8 is blocked by the base end member 82. ing.

  The base end member 82 is rotatably supported in the bearing case 44 via a bearing 45 (FIG. 1), and a handle H is connected to the lower side (anti-hollow bolt side). That is, the nut member 8 is supported by the bearing 45 through the base end member 82, and rotates in the inner case 4 when the operator rotates the handle H.

  Returning, an elliptical hole 81a is formed on the nut member 8 below the cylindrical portion 81 (on the side opposite to the hollow bolt). The hole 81a is disposed so as to overlap the hole 40b (FIGS. 1 and 3) of the inner case 4 in the axial direction. For this reason, when the nut member 8 is rotated to align the radial positions of the two holes 40b and 81a, the outside of the inner case 4 and the inside of the nut member 8 are communicated with each other through the holes 40b and 81a. (Fig. 1).

  Subsequently, as shown in FIG. 5, the hollow bolt 7 includes an annular nut portion 70 which is disposed on the upper side (bolt member side) and has a screw groove formed on the inner periphery, and a lower side of the nut portion 70 ( A cylindrical tube portion 71 which is coaxially connected to the nut member side and has an inner diameter r4 slightly larger than the inner diameter r3 of the nut portion 70, and is coaxially connected to the lower side (nut member side) of the cylindrical portion 71 A screw groove is formed around the periphery, and an inner diameter (not shown) is provided with a stopper holding portion 72 formed larger than the inner diameter r4 of the nut portion. Further, a screw groove is formed on the outer periphery of the hollow bolt 7 from the upper end to the lower end, and the nut portion 80 of the nut member 8 is screwed.

  A stopper 73 is attached to the stopper holding portion 72, and the stopper 73 is formed in an annular shape and has a stopper main body 74 having a screw groove on the inner periphery, and is screwed onto the inner periphery of the stopper main body 74. And bolt 75 to be used. The stopper main body 74 includes a screw portion 74a having a screw groove on the outer periphery and screwed into the stopper holding portion 72, and a flange portion 74b that is continuous with the screw portion 74a and protrudes outward. The bolt 75 is a hexagon socket head bolt, and is screwed into the stopper main body 74 from the side of the stopper main body 74 opposite to the screw thread, and the bolt head protrudes to the side of the stopper main body 74 opposite to the screw thread.

  Further, as shown in FIG. 5C, the flange portion 74b of the stopper main body 74 is formed in an oval shape by cutting off both ends of the circular member, and the maximum radial width r5 is the nut portion of the nut member 8. It is formed slightly larger than the inner diameter r1 (FIG. 4) of 80 and slightly smaller than the inner diameter r2 (FIG. 4) of the cylindrical portion 81 of the nut member 8. For this reason, the stopper 73 attached to the hollow bolt 7 can move in the axial direction in the cylindrical portion 81 of the nut member 8, but is not inserted into the nut portion 80 of the nut member 8. It is possible to prevent the member 8 from being completely removed. Moreover, the minimum width (not shown) of the radial direction of the flange part 74b can be made small, and the holes 40b and 81a formed in the inner side case 4 and the nut member 8 can be made small.

  Moreover, since the hexagon socket head bolt 75 is attached to the stopper main body 74, the stopper 73 can be attached to the hollow bolt 7 using the hexagon socket. However, the stopper 73 may be provided with a configuration other than the hexagonal hole for tool engagement for attaching the stopper 73 to the hollow bolt 7, and a known configuration is appropriately selected for the configuration of the tool and the tool engagement portion. be able to.

  Subsequently, as shown in FIG. 6, the bolt member 6 includes a screw shaft 60 having a screw groove formed on the outer periphery, and a stopper portion 61 coaxially connected to the lower side (hollow bolt side) of the screw shaft 60. I have. The screw groove of the screw shaft 60 is formed in the same direction as the screw groove formed on the outer periphery of the hollow bolt 7, and the nut portion 70 (see FIG. 5) is screwed together, and the upper end portion (base portion) of the screw shaft 60 is held between the clamping pieces 24b and 24b (FIG. 1).

  Further, no screw groove is formed on the outer periphery of the stopper portion 61, the stopper portion 61 is formed in a columnar shape, and the outer diameter r6 of the stopper portion 61 is the inner diameter r3 of the nut portion 70 of the hollow bolt 7 ( 5) and slightly smaller than the inner diameter r4 (FIG. 5) of the cylindrical portion 71 of the hollow bolt 7. For this reason, the stopper 61 portion of the bolt member 6 can move in the axial direction within the cylindrical portion 71 of the hollow bolt 7, but is not inserted into the nut portion 70, and the bolt member 6 completely comes out of the hollow bolt 7. This can be prevented.

  Next, the operation of the height adjusting apparatus A having the above configuration will be described. Here, the bolt member 6 is easier to rotate than the hollow bolt 7, that is, the frictional force acting between the bolt member 6 and the nut portion 70 of the hollow bolt 7 is greater between the hollow bolt 7 and the nut member 8. It demonstrates as a thing smaller than the frictional force which acts between the nut parts 80.

  As shown in FIG. 7A, when the handle H of the height adjusting device A in the most expanded and contracted state is grasped and the nut member 8 is rotated in the direction of the arrow y1, the rotation of the bolt member 6 and the nut member 8 is performed. Since the bolt member 6 and the hollow bolt 7 are relatively easier to rotate than the hollow bolt 7 and the nut member 8, the hollow bolt 7 rotates together with the nut member 8 to prevent the bolt member 6 and the pillar from being prevented. The bolt member 6 enters the hollow bolt 7 by rotating relative to the member 1.

  At this time, the outer case 2 is coupled to the bolt member 6, and the stopper piece 34 of the intermediate case 3 is hooked on the hook piece 25 of the outer case 2, and the intermediate case 3 is held in a state of being suspended from the outer case 2. Therefore, the outer case 2 and the intermediate case 3 move to the lower side (frame side) together with the bolt member 1. Therefore, the inner case 4 is inserted into the intermediate case 3, and the height adjusting device A contracts.

  Subsequently, as shown in FIG. 7B, when the stopper portion 61 of the bolt member 6 abuts on the stopper 73 attached to the hollow bolt 7, the bolt member 6 no longer enters the hollow bolt 7, The relative rotation between the bolt member 6 and the hollow bolt 7 is suppressed. For this reason, the nut member 8 rotates relative to the bolt member 6, the hollow bolt 7 and the support member 1, and the hollow bolt 7 enters the nut member 8 together with the bolt member 6.

  When the lower end of the intermediate case 3 is in contact with the frame F and the intermediate case 3 is supported by the frame F, the stopper piece 34 of the intermediate case 3 and the hook piece 25 of the outer case are separated from each other, and the intermediate case 3 and the intermediate case 3 are separated. 3 is inserted into the outer case 2, and the height adjusting device A further contracts.

  On the other hand, as shown in FIG. 8A, when the handle H of the height adjusting device A in the most contracted state is grasped and the nut member 8 is rotated in the direction of the arrow y2, the rotation of the bolt member 6 and the nut member 8 is performed. Is prevented by the column member 1 and the bolt member 6 and the hollow bolt 7 are more easily rotated relative to the hollow bolt 7 and the nut member 8, so that the hollow bolt 7 rotates together with the nut member 8 and the bolt member 6 and The bolt member 6 moves out of the hollow bolt 7 by rotating relative to the support member 1.

  At this time, since the outer case 2 is connected to the bolt member 6, the outer case 2 moves together with the bolt member 6 to the upper side (the opposite frame side). Therefore, the intermediate case 3 and the inner case 4 are withdrawn from the outer case 2, and the height adjusting device A is extended.

  Next, as shown in FIG. 8 (b), when the stopper portion 61 of the bolt member 6 reaches the nut portion 70 of the hollow bolt 7, the bolt member 6 can no longer be withdrawn from the hollow bolt 7. Relative rotation with the hollow bolt 7 is suppressed. For this reason, the nut member 8 rotates relative to the bolt member 6, the hollow bolt 7, and the support member 1, and the hollow bolt 7 retracts from the nut member 8.

  Further, when the hook piece 25 of the outer case 2 comes into contact with the stopper piece 34 of the intermediate case 3, the intermediate case 3 is lifted up by the outer case 2, and the inner case 2 is withdrawn from the intermediate case 3. A extends.

  Next, the effect of the height adjustment apparatus A according to the present embodiment will be described. The height adjusting device A is composed of a plurality of cases 2, 3 and 4 that are slidable in the axial direction, and is telescopically expanded and contracted, and the column members 1 are prevented from rotating relative to the cases 2, 3, and 4. And a feed screw mechanism 5 that is accommodated in the column member 1 and expands and contracts the column member 1.

  The strut member 1 includes three cases (an outer case 2, an intermediate case 3, and an inner case 4), and the feed screw mechanism 5 has a single bolt member 6 in which a screw groove is formed on the outer periphery. And a single nut member 8 formed in a cylindrical shape and having a screw groove on the inner periphery, and a single hollow bolt 7 formed in a cylindrical shape and formed with a screw groove on the outer periphery and the inner periphery. I have.

  Then, the hollow bolt 7 is screwed to the outer periphery of the bolt member 6, and the nut member 8 is screwed to the outer periphery of the hollow bolt 7, and relative rotation between the bolt member 7 and the column member 1 is performed. The relative rotation between the nut member 8 and the column member 1 is allowed.

  Thereby, in this embodiment, the strut member 1 is placed in the outer case 2 from the maximum extension state in which the intermediate case 3 is withdrawn to the maximum from the outer case 2 and the inner case 4 is withdrawn to the maximum from the intermediate case 3. It is possible to stroke to the maximum contracted state in which the case 3 enters the maximum and the inner case 4 enters the intermediate case 3 to the maximum.

  Further, the feed screw mechanism 5 allows the hollow bolt 7 to enter the nut member 8 from the maximum extension state in which the hollow bolt 7 is retracted to the maximum from the nut member 8 and the bolt member 6 is retracted to the maximum from the hollow bolt 7. At the same time, it is possible to make a stroke until the bolt member 6 enters the hollow bolt 7 to the maximum contracted state.

  Therefore, in the present embodiment, the column member 1 and the feed screw mechanism 5 can be expanded and contracted in two stages, and only the axial length at the time of the most contraction is maintained while maintaining the axial length at the time of the maximum extension. The stroke of the height adjusting device A can be increased so that only the axial length at the time of maximum extension becomes longer while shortening or maintaining the axial length at the time of maximum contraction.

  Further, in the height adjusting device A according to the present embodiment, the hollow bolt 7 includes an annular nut portion 70 that is formed in an annular shape and has a screw groove on the inner periphery thereof, and a nut member side (lower side) of the nut portion. And a cylindrical tube portion 71 having an inner diameter that is larger than the inner diameter of the nut portion 70. For this reason, the bolt member 6 is screwed with the nut portion 70 in the hollow bolt 7, and the stopper portion 61 of the bolt member 6 can move in the axial direction inside the cylindrical portion 71.

  Moreover, in the height adjusting apparatus A according to the present embodiment, the nut member 8 includes an annular nut portion 80 in which a screw groove is formed on the inner periphery, and an anti-hollow bolt side (lower side) of the nut portion 80. A cylindrical tube portion 81 having a continuous inner diameter larger than the inner diameter of the nut portion 80 is provided. For this reason, the hollow bolt 7 is screwed into the nut portion 80 of the nut member 8, and the stopper 73 attached to the hollow bolt 7 can move inside the cylindrical portion 81 in the axial direction.

  The hollow bolt 7 includes a stopper holding portion 72 that is connected to the nut member side (lower side) of the cylindrical portion 71, and a stopper 73 is attached to the stopper holding portion 72. That is, by forming the hollow bolt 7 and the stopper 73 as separate bodies, the stopper 73 can be attached to the hollow bolt 7 after the hollow bolt 7 is screwed from the upper side (bolt member side) of the nut member 8.

  Further, holes 81a and 40b are formed in the nut member 8 and the support member 1 (inner case 4), respectively. These holes 81 a and 40 b can communicate between the inside of the nut member 8 and the outside of the column member 1. Accordingly, when the inside of the nut member 8 and the outside of the support member 1 are communicated with each other through the two holes 81a and 40b, the stopper 73 is inserted into the nut member 8 through these holes 81a and 40b, and the hollow bolt 7 A stopper 73 can be attached to the. That is, the two holes 81a and 40b can function as working holes.

  In the present embodiment, the cases 2, 3, and 4 constituting the column member 1 include an outer case 2 that is disposed outside, and an intermediate case 3 that is inserted into the outer case 2 so as to be able to appear and retract. The inner case 4 is inserted into the intermediate case 3 so as to be able to appear and retract. The bolt member 6 is disposed inside the outer case 1, and the nut member 8 is disposed inside the inner case 4.

  Further, a recess 40 a is provided on the outer surface of the inner case 4, and the hole 40 b of the column member 1 is formed at the center of the recess 40 a. For this reason, when a lid (not shown) thinner than the depth of the recess 40a is attached to the recess 40b, the hole 40b is closed and the lid does not protrude from the inner case 4, and the column member 1 can be smoothly expanded and contracted. It is possible to suppress obstruction by the lid.

  In the present embodiment, each case (outer case 2, intermediate case 3, and inner case 4) is formed in a rectangular frame shape in cross section. For this reason, it is possible to easily prevent the relative rotation of the cases 2, 3, and 4.

  While the preferred embodiment of the present invention has been described above, it should be understood that modifications, variations and changes may be made without departing from the scope of the claims.

  For example, in the above-described embodiment, the height adjusting device A is used for adjusting the height of the support bar B in the tire holding device M. However, the present invention is not limited to this, and may be used for any other device.

  Moreover, in the said embodiment, while the support | pillar member 1 consists of three cases 2,3,4, the feed screw mechanism 5 has one bolt member 6, one hollow bolt 7, and one nut member 8. I have. However, a plurality of intermediate cases 2 and hollow bolts 7 may be provided, and the column member 1 and the feed screw mechanism 5 may be expanded and contracted in three or more stages.

  Even if the number of the intermediate case 2 of the support member 1 and the feed screw mechanism 5 hollow bolts 7 are different, for example, one of the support member 1 and the feed screw mechanism 5 is expanded and contracted in two stages and the other is expanded and contracted in three stages. Good.

  Further, in the above embodiment, the relative rotation between the bolt member 6 and the column member 1 is prevented, and the relative rotation between the nut member 8 and the column member 1 is allowed. A handle H as a driving means for driving 5 is attached. However, the relative rotation between the bolt member 6 and the column member 1 is allowed, the relative rotation between the nut member 8 and the column member 1 is prevented, and the handle H may be attached to the bolt member 6.

  The configurations and shapes of the bolt member 6, the hollow bolt 7, and the nut member 8 are not limited to the above, and can be changed as appropriate. For example, if the height adjusting device can be assembled, the hollow bolt 7 and the stopper 73 may be integrally formed like the screw portion 60 and the stopper portion 61 of the bolt member 6.

  Further, the configurations and shapes of the cases 2, 3, and 4 are not limited to the above, and can be changed as appropriate.

A, A1 Height adjusting device B Support bar F Frame H Handle M Tire holding device R1, R2 Support roller W Tire 1,100 Post member 2,200 Outer case 3 Intermediate case 4,400 Inner case 5,500 Feed screw mechanism 6 , 600 Bolt member 7 Hollow bolt 8, 800 Nut member 20, 21, 22, 23, 30, 31, 32, 33, 40, 41, 42, 43 Plate 24 Upper plate 25, 35 Hook piece 26 Handle 34, 46 Stopper Piece 44 Bearing case 45 Bearing 60 Screw shaft 61 Stopper portion 70, 80 Nut portion 71, 81 Tube portion 72 Stopper holding portion 73 Stopper 74 Stopper main body 75 Bolt 82 Base end member

Claims (8)

A strut member comprising a plurality of cases that are slidable in the axial direction and telescopically expanding and contracting and preventing relative rotation of each case, and a feed screw mechanism that is housed in the strut member and expands and contracts the strut member In a height adjustment device comprising:
The support member is composed of three or more cases.
The feed screw mechanism includes a bolt member having a screw groove formed on the outer periphery, a nut member formed in a cylindrical shape and having a screw groove formed on the inner periphery, and a cylindrical member formed on the outer periphery. And one or a plurality of hollow bolts in which a screw groove is formed on the inner periphery,
The hollow bolt is screwed to the outer periphery of the bolt member, and the other hollow bolt or the nut member is screwed to the outer periphery of the hollow bolt, and one of the bolt member or the nut member and the support column A height adjusting device, wherein relative rotation with a member is prevented, and relative rotation between the other of the bolt member or the nut member and the support member is allowed.   The hollow bolt includes an annular nut portion in which the screw groove is formed on the inner periphery, and a cylindrical tube portion that is connected to the nut member side of the nut portion and has an inner diameter larger than the inner diameter of the nut portion. The height adjusting device according to claim 1, comprising:   The nut member includes an annular nut portion in which the screw groove is formed on the inner periphery, and a cylindrical tube portion that is connected to an anti-hollow bolt side of the nut portion and has an inner diameter larger than the inner diameter of the nut portion. The height adjusting device according to claim 1, wherein the height adjusting device is provided.   The said hollow bolt is provided with the stopper holding | maintenance part connected with the nut member side of the said cylinder part in this hollow bolt, The stopper is attached to this stopper holding | maintenance part, The Claim 2 or Claim 3 characterized by the above-mentioned. Height adjustment device.   A hole is formed in each of the nut member and the column member, and these holes can communicate the inside of the nut member and the outside of the column member. The height adjusting device according to any one of 3. The case constituting the support member includes an outer case disposed on the outer side, an intermediate case inserted in the outer case so as to be able to appear and retract, and an inner case inserted in the intermediate case so as to be capable of appearing and retracting. ,
The height adjusting device according to any one of claims 1 to 5, wherein the bolt member is disposed inside the outer case, and the nut member is disposed inside the inner case. .   The height adjusting device according to claim 6, wherein a recess is provided in an outer peripheral surface of the inner case, and the hole of the support member is formed at the center of the recess.   The height adjusting device according to any one of claims 1 to 7, wherein each case is formed in a rectangular frame shape in cross section.

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