Forklift Hose Clamp Device

Abstract

To provide a hose clamp device of a forklift capable of adjusting tension of a hydraulic hose easily.SOLUTION: A hose clamp device 40 of a forklift comprises a clamp mechanism 41 that clamps a hydraulic hose 37 for supplying and discharging hydraulic oil to hydraulic equipment of cargo handling equipment, and a bracket 42 that is provided at the cargo handling equipment and to which the clamp mechanism 41 is attached. The clamp mechanism 41 includes a slide member 51 that is slidable with respect to the bracket 42, a clamp member 52 that clamps the hydraulic hose 37 together with the slide member 51, and a fastening member that fastens the clamp member 52 to the slide member 51. The bracket 42 is provided with a feed screw 48 that is held rotatably. The slide member 51 has a female threaded part that screws together with the feed screw 48. The clamp mechanism 41 slides relative to the bracket 42 according to the rotation of the feed screw 48.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a hose clamp device for a forklift, which is used to clamp and secure a hydraulic oil hose provided in the forklift. [Background technology]

[0002] As a conventional technique for a hose clamp device for a forklift, for example, a pipe attachment member for a forklift disclosed in Patent Document 1 is known. In the pipe attachment member for a forklift disclosed in Patent Document 1, the loading device is provided with a hydraulic hose for supplying and discharging hydraulic oil to raise and lower a lift cylinder. The hydraulic hose hangs down from a hose pulley that is raised and lowered by the lift cylinder, with one end connected to an actuator on the front side of the forklift and the other end routed around the outside of the outer mast and connected to a pipe on the vehicle body side at the bottom of the loading device.

[0003] The hydraulic hose hanging down from the hose pulley and routed along the outer mast is attached to the outer mast by an attachment member. The attachment member has a first clamp member, a second clamp member, and an attachment bolt. The first clamp member is provided on the outer mast and is attached to a connecting member to which one end of a chain is connected. With the hydraulic hose fitted into attachment grooves formed in the first clamp member and the second clamp member, the first clamp member and the second clamp member are fastened together by the attachment bolt.

[0004] In forklifts, the tension of the hydraulic hose hanging from the hose pulley needs to be adjusted. If the tension of the hydraulic hose is not appropriate, the hydraulic hose may interfere with other components of the loading device when the lift cylinder is activated. The tension of the hydraulic hose is adjusted by the operator. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-11186 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the piping attachment member for a forklift disclosed in Patent Document 1, when an operator adjusts the tension of a hydraulic hose (hydraulic hose), the operator does so after temporarily fixing the hydraulic hose hanging from the hose pulley to the outer mast with the attachment member. However, the tension adjustment work requires the operator to hold the hydraulic hose while loosening the attachment bolt, and then to pull the held hydraulic hose to obtain an appropriate tension, and then to fasten the fastening bolt while maintaining that state. In other words, the adjustment work of the hydraulic hose is extremely complicated, and there is a problem that it is very difficult for one operator to perform it because it requires a lot of effort. Furthermore, when four hydraulic hoses are attached, the tension adjustment work of the hydraulic hoses is practically impossible for one operator to perform.

[0007] SUMMARY OF THE PRESENT EMBODIMENT The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a hose clamp device for a forklift that allows easy adjustment of the tension of a hydraulic oil hose. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a hose clamp device for a forklift having a clamp mechanism that clamps a hydraulic oil hose that supplies and discharges hydraulic oil to hydraulic equipment of a loading device, and a bracket that is provided on the loading device and to which the clamp mechanism is attached, wherein the clamp mechanism has a slide member that is slidable relative to the bracket, a clamp member that clamps the hydraulic oil hose together with the slide member, and a fastening member that fastens the clamp member to the slide member, the bracket is provided with a lead screw that is rotatably held, the slide member has a female threaded portion that screws into the lead screw, and the clamp mechanism slides relative to the bracket in response to rotation of the lead screw.

[0009] In the present invention, in the loading device, the hydraulic oil hose is clamped by a clamp mechanism, and the clamp mechanism is attached to a bracket. By rotating the feed screw, the clamp mechanism slides relative to the bracket, and the tension of the hydraulic oil hose is changed according to the position of the clamp mechanism. Since the tension of the hydraulic oil hose is changed while the hydraulic oil hose remains clamped, an operator who adjusts the tension of the hydraulic oil hose can easily adjust the tension of the hydraulic oil hose.

[0010] In the above-described hose clamp device for a forklift, an end of the feed screw may have a fitting portion that fits with a tool that rotates the feed screw. In this case, the worker adjusting the tension of the hydraulic oil hose can rotate the feed screw using a tool that can engage with the fitting portion of the feed screw, making it easier to adjust the tension of the hydraulic oil hose.

[0011] In the above-mentioned hose clamp device for a forklift, the feed screw may be a trapezoidal screw. In this case, even if the clamp mechanism receives a tensile load via the hydraulic oil hose when the loading device is in operation, there is no risk of the feed screw rotating due to the tensile load.

[0012] In the above-described hose clamp device for a forklift, the female threaded portion may be a screw hole passing through the slide member. In this case, since the female thread portion is a screw hole that passes through the slide member, it is relatively easy to form the female thread portion in the slide member.

[0013] In the above-described hose clamp device for a forklift, the female thread portion may be a thread groove formed in an opposing surface of the slide member facing the bracket in an axial direction of the feed screw. In this case, since the female thread portion is a thread groove formed in the axial direction on the opposing surface of the slide member that faces the bracket, it is possible to make the slide member thinner than when a threaded hole is provided in the slide member, and the space required for the clamping mechanism can be reduced. Effect of the Invention

[0014] According to the present invention, it is possible to provide a hose clamp device for a forklift that allows easy adjustment of the tension of a hydraulic oil hose. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a side view of a forklift according to a first embodiment. [Diagram 2] 1 is a front view showing an outline of a cargo handling device of a forklift according to a first embodiment. [Diagram 3] 1 is a perspective view showing an overview of a cargo handling device of a forklift according to a first embodiment. [Figure 4] 1 is a perspective view showing a main part of a hose clamp device according to a first embodiment. [Diagram 5] FIG. 1 is a plan view of a hose clamp device according to a first embodiment. [Figure 6] 1 is a perspective view showing a hose clamp device according to a first embodiment, with a part cut away; [Figure 7] FIG. 1(a) is a front view of a hose clamp device clamping a hydraulic oil hose, FIG. 1(b) is a front view of the hose clamp device with the clamp mechanism lowered, and FIG. 1(c) is a front view of the hose clamp device with the clamp mechanism raised. [Figure 8] FIG. 6(a) is a perspective view showing a main part of a hose clamp device according to a second embodiment, and FIG. 6(b) is a perspective view showing a main part of another example of the hose clamp device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (First embodiment) A hose clamp device for a forklift according to a first embodiment (hereinafter simply referred to as a "hose clamp device") will be described below with reference to the drawings. First, a forklift to which the hose clamp device is applied will be described. Note that the terms "front-rear," "left-right," and "up-down" that specify directions are shown based on a state in which a forklift operator is seated in the driver's seat and facing the forward movement of the forklift.

[0017] As shown in Fig. 1, the forklift 10 is provided with a loading device 12 at the front of a vehicle body 11. A driver's seat 13 is provided near the center of the vehicle body 11. Driving wheels 14 serving as front wheels are provided at the front of the vehicle body 11, and steering wheels 15 serving as rear wheels are provided at the rear of the vehicle body 11. A counterweight 16 is provided at the rear of the vehicle body 11, and the counterweight 16 is used to adjust the vehicle weight and achieve weight balance in the vehicle body 11. A head guard 17 that covers the upper part of the driver's seat 13 is provided on the vehicle body 11.

[0018] The cargo handling device 12 is equipped with a mast 20 having outer masts 18 and inner masts 19. The pair of left and right outer masts 18 are equipped with inner masts 19 that can slide inside the outer masts 18. A hydraulically operated tilt cylinder 21 is installed between the vehicle body 11 and the outer masts 18. The masts 20 tilt in the front-rear direction with their lower ends as a fulcrum when the tilt cylinders 21 are operated. The masts 20 are equipped with hydraulically operated lift cylinders 22. When the lift cylinders 22 are operated, the inner masts 19 slide within the outer masts 18 to rise and fall. A pair of left and right forks 23 are attached to the masts 20 via lift brackets 24, and the lift brackets 24 are arranged to rise and fall relative to the inner masts 19.

[0019] As shown in Fig. 2, the lift bracket 24 includes a pair of upper and lower finger bars 25, 26 and a connecting member 27 that connects both ends of the pair of upper and lower finger bars 25, 26. The upper finger bar 25 is an upper finger bar, and the lower finger bar 26 is a lower finger bar. The finger bars 25, 26 are members that respectively engage the pair of left and right forks 23. A backrest 28 can be attached to the lift bracket 24 as shown in Fig. 2.

[0020] 2 and 3, the upper parts of the pair of left and right outer masts 18 are connected by an upper beam 31. A chain anchor bracket 32 ​​is provided on the outer masts 18. The chain anchor bracket 32 ​​is a bracket for connecting one end of a lift chain 33. The other end of the lift chain 33 is connected to the lift bracket 24.

[0021] The upper parts of the pair of left and right inner masts 19 are connected by an upper beam 34. The inner masts 19 are provided with a chain sprocket 35 around which a lift chain 33 is hung. On one (right) inner mast 19, a hose wheel 36 around which a pair of hydraulic oil hoses 37 are hung is provided near the chain sprocket 35. The hydraulic oil hose 37 is part of a pipe that supplies and discharges hydraulic oil to and from hydraulic equipment (such as a side shift cylinder or a fork shift cylinder) provided on the lift bracket 24. One end of the hydraulic oil hose 37 hung on the hose wheel 36 is connected to a pipe (not shown) provided on the vehicle body 11, and the other end of the hydraulic oil hose 37 is connected to a pipe or hydraulic equipment provided on the lift bracket 24.

[0022] As shown in Figs. 2 and 3, the forklift 10 of this embodiment includes a hose clamp device 40. As shown in Fig. 4, the hose clamp device 40 includes a clamp mechanism 41 for clamping the hydraulic oil hose 37 and a bracket 42 for mounting the clamp mechanism 41. Starting with the bracket 42, as shown in Fig. 5, the bracket 42 is fixed to the chain anchor bracket 32. The bracket is fixed to the chain anchor bracket 32 ​​by bolts (not shown) or by welding. The bracket 42 includes a plate-shaped main body 43 and a pair of guide parts 44 protruding from one surface of the main body 43. An end of the main body 43 is attached to the chain anchor bracket 32 ​​so that the plate surface of the main body 43 is aligned vertically. The guide part 44 is formed of a plate member bent into an L-shape. Between the pair of left and right guide parts 44, the clamp mechanism 41 is provided so as to be slidable in the vertical direction.

[0023] A vertical groove 45 is formed in the center of the main body 43 in the left-right direction. The groove 45, together with the guide 44, has the function of guiding the clamp mechanism 41 in the up-down direction. A feed screw support 46 protruding toward the groove 45 is provided at the upper end and the lower end of the main body 43. The feed screw support 46 is a plate-shaped member that rotatably supports the feed screw 48, and has an insertion hole 47 through which the end of the feed screw 48 is inserted. The feed screw 48 is a member that holds the clamp mechanism 41 relative to the bracket 42 and slides the clamp mechanism 41 relative to the bracket 42. The feed screw 48 in this embodiment is a trapezoidal screw. A cross groove 49 is formed at the upper end of the feed screw 48 as a fitting portion so that a tool such as a screwdriver that rotates the feed screw 48 can be fitted.

[0024] The clamp mechanism 41 has a slide member 51 that is slidable relative to the bracket 42, a clamp member 52 that clamps the hydraulic oil hose 37 together with the slide member 51, and a bolt 53 as a fastening member that fastens the clamp member 52 to the slide member 51. The slide member 51 is a plate-shaped member and is provided between the pair of left and right guide portions 44. The slide member 51 has a protrusion 54 that fits into a groove portion 45 of the main body portion 43 of the bracket 42.

[0025] As shown in FIG. 6, the protrusion 54 is provided with a protrusion screw hole 55 that penetrates the slide member 51 and screws into the feed screw 48. Therefore, when the feed screw 48 is rotated in one direction, the slide member 51 rises relative to the bracket 42, and when the feed screw 48 is rotated in the other direction, the slide member 51 descends relative to the bracket 42. A pair of fastening screw holes 56 are formed in the slide member 51 (see FIG. 5). The fastening screw holes 56 are screw holes into which the shafts of bolts 53 for fastening the clamp member 52 to the slide member 51 are screwed. Note that a portion of the guide portion 44 covers both the left and right ends of the slide member 51 from the front, so that movement of the slide member 51 in the left-right and front-rear directions relative to the guide portion 44 is restricted.

[0026] The clamp member 52 has a groove 57 formed to follow the outer periphery of the hydraulic oil hose 37. The groove 57 has an arc groove 58 having an arc-shaped cross section so that the pair of left and right hydraulic oil hoses 37 can be passed through (see FIG. 5). Bolt holes 59 through which the shafts of the bolts 53 can be inserted are formed near both ends of the clamp member 52 in the longitudinal direction. By aligning the hydraulic oil hose 37 with the arc groove 58 and then fastening the clamp member 52 to the slide member 51 with the bolts 53, the hydraulic oil hose 37 is clamped by the clamp member 52 and the slide member 51 while elastically deforming.

[0027] Next, a procedure for adjusting the tension of the hydraulic oil hose 37 by the hose clamp device 40 according to this embodiment will be described. The hydraulic oil hose 37 is hung on the hose wheel 36, one end of the hydraulic oil hose 37 is connected to a pipe provided on the vehicle body 11, and the other end of the hydraulic oil hose 37 is connected to a pipe or a hydraulic device provided on the lift bracket 24. As shown in FIG. 7(a), first, an operator clamps the hydraulic oil hose 37 by the clamp mechanism 41. Specifically, the hydraulic oil hose 37 is fitted into the arc groove 58 of the clamp member 52, and the clamp member 52 is fastened to the slide member 51 by the bolt 53. The clamp member 52 is fastened to the slide member 51 by the bolt 53, so that the hydraulic oil hose 37 is clamped by the slide member 51 and the slide member 51.

[0028] When increasing the tension of the hydraulic oil hose 37 from the state shown in FIG. 7(a), the operator fits a tool such as a screwdriver into the cross groove 49 and rotates the feed screw 48 in one direction with the tool. The rotation of the feed screw 48 in one direction causes the slide member 51 to descend relative to the bracket 42, and the clamp mechanism 41 slides and descends together with the hydraulic oil hose 37. Therefore, for example, as shown in FIG. 7(b), the lowered clamp mechanism 41 pulls down the hydraulic oil hose 37 it clamps, so that the tension between the end of the hydraulic oil hose 37 on the lift bracket 24 side and the clamp mechanism 41 increases. In other words, when the hydraulic oil hose 37 is loose and tension is insufficient, the operator can adjust the feed screw 48 in one direction to increase the tension of the hydraulic oil hose 37.

[0029] To reduce the tension of the hydraulic oil hose 37, the operator rotates the feed screw 48 in the other direction using a tool such as a screwdriver. The rotation of the feed screw 48 in the other direction causes the slide member 51 to rise relative to the bracket 42, and the clamp mechanism 41 slides and rises together with the hydraulic oil hose 37. Therefore, for example, as shown in FIG. 7(c), the raised clamp mechanism 41 pulls up the clamped hydraulic oil hose 37, so that the tension between the end of the hydraulic oil hose 37 on the lift bracket 24 side and the clamp mechanism 41 is reduced. In other words, if the hydraulic oil hose 37 is too taut and the tension is excessive, the operator can adjust it by rotating the feed screw 48 in the other direction to reduce the tension of the hydraulic oil hose 37.

[0030] The upward and downward movement of the clamp mechanism 41 is restricted by a pair of upper and lower feed screw support parts 46. Even if the clamp mechanism 41 continues to slide and rise due to rotation of the feed screw 48 in one direction, the slide member 51 abuts against the feed screw support part 46 located on the upper side, restricting the upward movement of the clamp mechanism 41. Also, even if the clamp mechanism 41 continues to slide and fall due to rotation of the feed screw 48 in the other direction, the slide member 51 abuts against the feed screw support part 46 located on the lower side, restricting the downward movement of the clamp mechanism 41.

[0031] The hose clamp device 40 of the present embodiment has the following advantages. (1) In the loading device 12, the hydraulic oil hose 37 is clamped by a clamp mechanism 41, and the clamp mechanism 41 is attached to a bracket 42. By rotating the feed screw 48, the clamp mechanism 41 slides relative to the bracket 42, and the tension of the hydraulic oil hose 37 is changed according to the position of the clamp mechanism 41. Since the tension of the hydraulic oil hose 37 is changed while the hydraulic oil hose 37 remains clamped, an operator adjusting the tension of the hydraulic oil hose 37 can easily adjust the tension of the hydraulic oil hose 37. In addition, the tension of the hydraulic oil hose 37 can be adjusted by a single operator regardless of the number of hydraulic oil hoses 37 to be clamped.

[0032] (2) The end of the feed screw 48 has a cross groove 49 as a fitting portion that fits with a tool that rotates the feed screw 48. Therefore, an operator who adjusts the tension of the hydraulic oil hose 37 can rotate the feed screw 48 using a tool that fits into the cross groove 49, making it easier to adjust the tension of the hydraulic oil hose 37.

[0033] (3) Because the feed screw 48 is a trapezoidal thread, even if the clamp mechanism 41 receives a pulling load through the hydraulic oil hose 37 when the loading device 12 is in operation, there is no risk of the feed screw 48 rotating due to the pulling load. In addition, because the feed screw 48 is a trapezoidal thread, there is no risk of the position of the clamp mechanism 41, to which tension has been set, shifting, and it is possible to prevent the tension of the hydraulic oil hose 37 from fluctuating due to the positional shift of the clamp mechanism 41.

[0034] (4) Since the female thread is the projection screw hole 55 that penetrates the projection 54 of the slide member 51, it is relatively easy to form the female thread in the slide member 51.

[0035] Second Embodiment Next, a hose clamp device according to a second embodiment will be described. The hose clamp device of this embodiment differs from the first embodiment in the configuration of the bracket and the slide member. In this embodiment, the same configuration as the first embodiment will be described with reference to the first embodiment, and common reference numerals will be used.

[0036] As shown in FIG. 8(a), the hose clamp device 60 of this embodiment has a clamp mechanism 61 that clamps the hydraulic oil hose 37, and a bracket 62 for mounting the clamp mechanism 61. The bracket 62 is fixed to the chain anchor bracket 32 ​​by a bolt (not shown). The bracket 62 has a plate-shaped main body 63 and a pair of guide parts 64 that protrude from one surface of the main body 63. The guide parts 64 are formed of a plate member bent into an L-shape. The clamp mechanism 61 is provided between the pair of left and right guide parts 64 so as to be slidable in the up and down direction. A groove part (not shown) into which the feed screw 48 is inserted is provided on the surface of the main body 63 that faces the clamp mechanism 61.

[0037] The clamp mechanism 61 includes a slide member 65 that can slide relative to the bracket 62, a clamp member 52 that clamps the hydraulic oil hose 37 together with the slide member 51, and a bolt 53 that fastens the clamp member 52 to the slide member 51. The slide member 65 is a plate-shaped member and is provided between a pair of left and right guide parts 64. A screw groove 66 is provided on the surface of the slide member 65 that faces the bracket 62 as a female screw part that screws with the feed screw 48. That is, the screw groove 66 is formed in the axial direction on the surface of the slide member 65 that faces the bracket 62. Therefore, when the feed screw 48 is rotated in one direction, the slide member 65 rises relative to the bracket 62, and when the feed screw 48 is rotated in the other direction, the slide member 65 falls relative to the bracket 62. Note that a part of the guide part 64 covers both the left and right ends of the slide member 65 from the front, so that the movement of the slide member 65 in the left and right direction and the front and rear direction relative to the guide part 64 is restricted.

[0038] The hose clamp device 60 of this embodiment provides the same effects as the effects (1) to (3) of the first embodiment. Also, a screw groove 66 is formed in the axial direction of the feed screw 48 on the surface of the slide member 65 that faces the bracket 62. Therefore, compared to the case where the slide member 51 is provided with the protruding screw hole 55, which is an internally screwed hole, the thickness of the slide member 65 can be made smaller, and the space required for the clamp mechanism 61 can be reduced.

[0039] As another example of this embodiment, the feed screw 48 may be a metric thread instead of a trapezoidal thread. In this case, for example, as shown in FIG. 8(b), the feed screw 48 may be long enough so that the end of the feed screw 48 protrudes from the feed screw support portion 46, and a nut 67 may be fastened to the protruding end of the feed screw 48. The nut 67 prevents the feed screw 48 from rotating due to the tension of the hydraulic oil hose 37 even if the tension acts on the feed screw 48 through the clamp mechanism 61. When adjusting the tension of the hydraulic oil hose 37, the nut 67 may be removed and the feed screw 48 may be rotated. According to this example, a metric thread can be used for the feed screw 48, and the manufacturing cost can be reduced compared to the case of using a trapezoidal thread.

[0040] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit of the invention. For example, the following modifications may be made.

[0041] In the above embodiment, the end of the feed screw has a fitting portion that fits with a tool for rotating the feed screw, but this is not limited to this. For example, if the feed screw can be rotated without using a tool, the feed screw does not need to have a fitting portion. In this case, it is expected that the manufacturing cost of the feed screw can be reduced and the adjustment work of the hydraulic oil hose can be simplified. In the above embodiment, the fitting portion of the feed screw is exemplified as a cross groove, but the fitting portion is not limited to the cross groove. For example, the fitting portion may be a hexagonal hole into which a hexagonal wrench can be inserted, or may be a fitting portion other than a groove or hole. In the above embodiment, the hose clamp device clamps two hydraulic oil hoses, but the number of hydraulic oil hoses to be clamped is not limited to two. For example, four hydraulic oil hoses may be clamped. In the above embodiment, the hose clamp device is provided on the chain anchor bracket attached to the outer mast, but the hose clamp device is not limited to being provided on the chain anchor bracket. For example, the hose clamp device may be provided on a hydraulic cylinder that is erected on a lower beam that connects the lower ends of the outer masts. In this case, a hose wheel is provided on the rod end of the hydraulic cylinder, and a hose clamp device for clamping a hydraulic oil hose hung on the hose wheel is provided on the cylinder body of the hydraulic cylinder. In the alternative embodiment of the second embodiment, the feed screw is a metric thread and a rotation-preventing nut is attached. However, in an alternative embodiment of the first embodiment, a metric thread and a rotation-preventing nut may be used. [Explanation of symbols]

[0042] 10. Forklift 12 Cargo handling equipment 20 Mast 24 Lift bracket 32 Chain anchor bracket 33 Lift Chain 36 Horse Wheel 37 Hydraulic oil hose 40, 60 Hose clamp device 41, 61 Clamp mechanism 42, 62 Bracket 46 Lead screw support 47 Insertion hole 48 Lead screw 49 Cross groove (fitting part) 51, 65 Slide member 52 Clamping member 53 Bolts (fastening members) 54 Protrusion 55 Projection screw hole (female thread) 57 Groove 66 Thread groove (male thread) 67 Nut

Claims

1. a clamp mechanism that clamps a hydraulic oil hose that supplies and discharges hydraulic oil to and from a hydraulic device of the loading / unloading device; a bracket provided on the loading device to which the clamp mechanism is attached, The clamp mechanism includes: a slide member slidable relative to the bracket; a clamp member that clamps the hydraulic oil hose together with the slide member; a fastening member for fastening the clamp member to the slide member, The bracket includes a lead screw rotatably supported thereon; the slide member has a female thread portion that screws into the feed screw, A hose clamp device for a forklift, wherein the clamp mechanism slides relative to the bracket in response to rotation of the feed screw.

2. 2. The hose clamp device for a forklift according to claim 1, wherein an end of the feed screw has a fitting portion that fits with a tool that rotates the feed screw.

3. 3. The hose clamp device for a forklift according to claim 1, wherein the feed screw is a trapezoidal screw.

4. 4. The hose clamp device for a forklift according to claim 1, wherein the female thread portion is a threaded hole penetrating the slide member.

5. 4. A hose clamp device for a forklift according to claim 1, wherein the female thread portion is a thread groove formed in an axial direction of the feed screw on an opposing surface of the slide member facing the bracket.

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