Irregular winding prevention device

Abstract

To provide a device for preventing irregular winding in a winch that is in a freely rotatable state.SOLUTION: Irregular winding prevention devices (2, 2A, 4, 5, 6) provided on a winch drum (10) having a cylindrical drum body (11) on which a wire (W) is wound and circular drum discs (12) located at both ends of the drum body (11), and configured to prevent irregular winding when the wire (W) is pulled out from the winch drum (10) in a freely rotatable state, have contact members (21, 21A, 41, 51, 61) that can be pressed against a peripheral surface (12a) or a board surface (12b) of the drum disc (12) in order to stop or suppress the rotation of the winch drum (10).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a device for preventing the turbulent winding of a wire rope on a winch drum. [Background technology]

[0002] A winch is used to move an object by attaching the tip of a wire to the object and winding the wire onto a winch drum using a hydraulic or electric motor. Several systems have been proposed as devices to prevent the wire rope (hereinafter abbreviated as "wire") from being wound around a winch drum. For example, there are wire shifter systems (Patent Documents 1 and 2, etc.) that shift the wire in the axial direction of the wire drum while winding it, wire pressure roller systems (Patent Documents 3 and 4, etc.) that prevent the wound wire from floating, systems that detect slack in the wire and activate the winch brake (Patent Document 5, etc.), and systems that constantly apply tension to the wire when it is pulled out (Patent Document 6, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 59-192697 [Patent Document 2] Japanese Patent Application Publication No. 8-301580 [Patent Document 3] Japanese Patent Application Publication No. 10-120378 [Patent Document 4] Japanese Utility Model Application Publication No. 55-109685 [Patent Document 5] Japanese Utility Model Application Publication No. 4-17444 [Patent Document 6] Japanese Utility Model Application Publication No. 4-53790 Summary of the Invention [Problem to be solved by the invention]

[0004] Most of the conventional irregular winding prevention devices are intended to prevent irregular winding due to slack in the wire when the wire is wound by a motor. However, tangled wire can also occur when the wire is being pulled out, especially when the motor is stopped or power transmission to the motor is cut off and the winch drum is free to rotate freely, and the wire is pulled out manually or by another machine / vehicle.

[0005] Typically, when you start to pull out a wire that has been completely wound around a winch drum, there is a lot of resistance, so a lot of force is required. This large force causes the winch drum to start rotating, and as the wire begins to be pulled out, the resistance gradually decreases, and the winch drum rotates more smoothly. Then, when the rotation speed of the winch drum becomes faster than the speed at which the wire is being pulled out, the wire becomes loose and becomes tangled. Once this happens, it is difficult to remove the wire that has become intricately wound around the winch drum by hand, and even if you try to turn the winch drum by driving the motor, it may already be unable to rotate. Conventional anti-winding devices cannot prevent such winding of a winch drum that is in a freely rotatable state without power control.

[0006] SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for preventing overspooling in a winch that is in a free-rotating state. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides the following configuration: The numbers in parentheses are symbols in the drawings described below and are provided for reference.

[0008] [1] An aspect of the present invention is a random winding prevention device (2, 2A, 4, 5, 6) that is provided on a winch drum (10) having a cylindrical drum body (11) on which a wire (W) is wound and disk-shaped drum discs (12) located at both ends of the drum body (11), and that prevents random winding of the wire (W) when the wire (W) is pulled out from the winch drum (10) in a freely rotatable state, A random winding prevention device characterized by having a contact member (21, 21A, 41, 51, 61) that can be pressed against the peripheral surface (12a) or disc surface (12b) of the drum disc (12) to stop or suppress the rotation of the winch drum (10). [2] In the above aspect [1], the contact member (21) is a cylindrical contact roller (21) that can be pressed against the peripheral surface (12a) of the drum disc (12), The contact roller (21) pressed against the peripheral surface (12a) of the drum disc (12) rotates in accordance with the rotation of the drum disc (12) when the rotation speed of the winch drum (10) is within a predetermined allowable range, and when the rotation speed of the winch drum (10) becomes excessive, its rotation is stopped or suppressed. [3] In the above aspect [1], the contact member (21A) is a truncated cone-shaped contact roller (21A) that can be pressed against the disc surface (12b) of the drum disc (12), The contact roller (21A) pressed against the disc surface (12b) of the drum disc (12) rotates in accordance with the rotation of the drum disc (12) when the rotation speed of the winch drum (10) is within a predetermined allowable range, and when the rotation speed of the winch drum (10) becomes excessive, the rotation is stopped or suppressed. [4] In the above aspect [2] or [3], the rotation shaft extension (211) of the contact roller (21, 21A) is rotatably supported on the central axis of the hollow stationary cylinder (22), The rotary shaft extending mechanism has at least one coil spring (28) extending radially from the rotary shaft extension within the hollow of the stationary cylindrical body (22), and a contact plate (29) attached to a tip of the coil spring (28), When the rotational speed of the winch drum (10) is within an allowable range, the contact plate (29) is spaced from the inner surface of the stationary cylindrical body (22); When the rotation speed of the winch drum (10) becomes excessive, the coil spring (28) expands due to centrifugal force, and the contact plate (29) comes into contact with the inner surface of the stationary cylinder (22). [5] In the above aspect [2] or [3], the device is characterized by having a trigger mechanism (24) that can switch between a use state in which the contact roller (21, 21A) is pressed against the drum disc (12) and a non-use state in which the contact roller (21, 21A) is separated from the drum disc (12). [6] In the above aspect [1], the contact member (21) is a contact plate (41) that can be pressed against the peripheral surface (12a) of the drum disk (12) in a planar manner, a spring can (42) having a pressing body (42e) connected to the contact plate (41) for constantly pressing the contact plate (41) against the drum disc (12); a spring claw seat (43) to which the erected portion (42a) of the spring claw (42) is fixed and which has a hook portion (44) for hooking the annular portion (42h) of the spring claw (42); and a stationary support frame (45) that supports the spring can seat (43). [7] In the above aspect [1], the contact member (51) is a contact plate (51) that can be pressed against the peripheral surface (12a) of the drum disk (12) in a planar manner, a support frame for supporting the contact plate (51) so that the contact plate (51) is always pressed against the peripheral surface (12a) of the drum disk (12); The support frame is characterized by comprising a means for adjusting the position of the contact plate (51) relative to the drum disc (12). [8] In the above aspect [1], the contact member (61) is a pair of brake pads (61a, 61b) arranged so as to be able to press against both disc surfaces of the drum disc (12), respectively; a caliper (62) disposed across the periphery of the drum disc (12) and supporting the pair of brake pads (61a, 61b); and a hydraulic mechanism for moving at least one of the brake pads (61a, 61b). [9] In the aspect [8] above, a speed sensor (66) for detecting the rotation speed of the drum disc (12); The hydraulic mechanism is further characterized by further comprising a control unit (67) for controlling the hydraulic mechanism based on the rotation speed detected by the speed sensor (66).

[10] Another aspect of the present invention is a winch equipped with the random winding prevention device according to any one of [2], [3], [6], [7], [8] or [9] above. [Effects of the Invention]

[0009] According to the present invention, irregular winding of a winch that is in a freely rotatable state can be prevented. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic front view of a winch equipped with an anti-winding device according to one embodiment. [Figure 2] FIG. 2 is a schematic view taken along the arrow I in FIG. [Figure 3] FIG. 3(a) is a schematic plan view of the winch of FIG. 1, and (b) is a schematic perspective view of the random winding prevention device shown in (a). [Figure 4] FIG. 4(a) is a schematic plan view of a winch equipped with a modified type of irregular winding prevention device, and (b) is a schematic perspective view of the irregular winding prevention device shown in (a). [Figure 5] 5(a) and 5(b) are schematic cross-sectional views showing the state of the irregular winding prevention device when the winch drum rotates within the allowable range. [Figure 6] 6(a) and 6(b) are schematic cross-sectional views showing the state of the random winding prevention device when the winch drum rotates excessively. [Figure 7]Figure 7(a) is a schematic cross-sectional view taken along line IV-IV in Figure 3(b) showing the state of the trigger mechanism when the random winding prevention device is not in use, and (b) is a schematic cross-sectional view taken along line IV-IV in Figure 3(b) showing the state of the trigger mechanism when the random winding prevention device is in use, and (c) is a diagram showing the operation of the locking means and the releasing means. [Figure 8] FIG. 8 is a schematic front view of a winch equipped with a random winding prevention device according to another embodiment. [Figure 9] FIG. 9 is a schematic plan view of the winch of FIG. [Figure 10] FIG. 10 is a schematic view taken along the arrow V in FIG. [Figure 11] FIG. 11 is a schematic view taken along the arrow VI in FIG. [Figure 12] FIG. 12 corresponds to a schematic cross section taken along line VII-VII in FIG. 9, where (a) shows how to set up the irregular winding prevention device for use, and (b) shows the irregular winding prevention device in use. [Figure 13] FIG. 13 is a partially enlarged view taken along the arrow V in FIG. 10, showing an adjusting tool for adjusting the frictional force of the contact plate against the drum disc. [Figure 14] FIG. 14 is a schematic front view of a winch equipped with a random winding prevention device according to still another embodiment. [Figure 15] FIG. 15 is a schematic view taken along the line VII in FIG. [Figure 16] FIG. 16 is an exploded view of the irregular winding prevention device. [Figure 17] FIG. 17 is a schematic front view of a winch equipped with a random winding prevention device according to still another embodiment. [Figure 18] FIG. 18 is a partial front view showing a variation of the embodiment of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, identical or similar components in each embodiment are denoted by the same or similar reference numerals.

[0012] Fig. 1 is a schematic front view of a winch equipped with an anti-winding device of one embodiment. Fig. 2 is a schematic view taken along arrow I in Fig. 1. Fig. 3(a) is a schematic plan view of the winch in Fig. 1, and (b) is a schematic perspective view of the anti-winding device shown in (a).

[0013] The illustrated winch 1 includes a winch drum 10, a motor 13 that drives the winch drum 10, and a reducer 15 that can adjust the rotation speed caused by the power transmitted from the motor 13. The motor 13 and the reducer 15 are supported by an appropriate frame 16.

[0014] The winch drum 10 comprises a cylindrical drum body 11 around which a wire W is wound, and disk-shaped drum discs 12 located at both ends of the drum body 11. The winch drum 10 is supported on a shaft so that the entire body rotates integrally.

[0015] The motor 13 may be a hydraulic motor or an electric motor. A motor shaft 14 of the motor 13 passes through the drum body 11 and can be connected to a reducer 15. The reducer 15 incorporates, for example, multiple planetary gears to switch the speed of the rotation transmitted from the motor shaft 14.

[0016] The reducer 15 can transmit power at an adjusted rotational speed to rotate the winch drum 10. On the other hand, the reducer 15 has a mechanism, such as a clutch mechanism, that disconnects the winch drum 10 from the motor power. When the winch drum 10 is disconnected from the motor power, the winch drum 10 can rotate freely.

[0017] For example, when the wire W is completely wound around the drum body 11 and the wire W is to be pulled out manually or by machine / vehicle, the winch drum 10 must be set to a freely rotatable state. At this time, because the winch drum 10 is initially stationary and heavy, a large force must be applied to pull out the wire W. Once the winch drum 10 starts to rotate, it gradually becomes easier to rotate, and if the force is too great, the rotation speed becomes excessive, causing slack in the wire W. As this slack increases, the wire W wound around the drum body 11 also loosens and randomly crosses, resulting in a disorderly winding. It is extremely difficult to manually untangle the wire W that has become disorderly, and even if the motor is operated, the winch drum 10 may become unable to rotate.

[0018] The present invention provides a random winding prevention device for preventing random winding during free rotation of the winch drum 10. The random winding prevention device of the present invention has the function of stopping or suppressing the rotation of the winch drum 10 when it is in a free rotation state. "Stopping" means completely stopping the rotation, and "suppressing" means reducing the rotation speed. For this reason, the random winding prevention device of the present invention is provided with a contact member that can be pressed against the peripheral surface 12a or the disk surface 12b of the drum disk 12. The peripheral surface 12a is an annular outer peripheral surface having a predetermined width of the disk-shaped drum disk 12. The disk surface 12b is at least one of the two circular end surfaces of the disk-shaped drum disk 12. However, from the viewpoint of avoiding interference between the contact member and the wire W, it is preferable that the disk surface 12b against which the contact member is pressed is an outer surface where the wire W is not present.

[0019] 1 is one embodiment of the device for preventing irregular winding according to the present invention. The contact member in the device for preventing irregular winding 2 is a cylindrical contact roller 21 that can be pressed against the peripheral surface 12a of the drum disc 12. The contact roller 21 is rotatably supported, and its rotation axis is parallel to the rotation axis of the drum disc 12.

[0020] When in use, the contact roller 21 is pressed with a predetermined force against the peripheral surface 12a of the drum disc 12. When the winch drum 10 is freely rotating and the rotation speed is within a predetermined allowable range, the contact roller 21 rotates in conjunction with the rotation of the drum disc 12. At this time, the contact roller 21 rotates without slipping on the drum disc 12, so no friction occurs.

[0021] When the rotational speed of the winch drum 10 exceeds a predetermined allowable range and becomes excessive, the contact roller 21 does not follow the rotation of the drum disc 12 and slips, exerting a frictional force on the drum disc 12. This at least reduces the rotational speed of the drum disc 12, and in some cases causes the rotation of the drum disc 12 to stop. A specific example of this mechanism will be described later with reference to Figures 5 and 6.

[0022] As shown in Figure 3(b), the irregular winding prevention device 2 has a contact roller 21 that is pressed against the drum disk 12, and its rotation shaft extension 211 extends on the central axis of a hollow stationary cylinder 22 and is rotatably supported. The stationary cylinder 22 is supported at the lower end position of its outer circumferential surface by a lifting shaft 23. The lifting shaft 23 is located on the central axis of a lifting mechanism 24 and extends upward. In the illustrated example, the lifting mechanism 24 has a flat cylindrical housing.

[0023] The arrival shaft 23 can rotate at a predetermined angle around the central axis of the arrival mechanism 24. The arrival mechanism 24 is equipped with a lock operation unit 24a and an unlock operation unit 24b. The arrival mechanism 24 can switch between an in-use state (see solid line in FIG. 3(a)) in which the contact roller 21 is pressed against the drum disc 12, and an in-use state (see dotted line in FIG. 3(a)) in which the contact roller 21 is separated from the drum disc 12. A specific example of the arrival mechanism 24 will be described later with reference to FIG. 7. The arrival mechanism 24 is supported on an appropriate support base 25. The support base 25 is fixed to the frame 16 of the winch 1.

[0024] 4(a) is a schematic plan view of a winch 1 equipped with a modified irregular winding prevention device 2A, and (b) is a schematic perspective view of the irregular winding prevention device 2A shown in (a). The contact member in the irregular winding prevention device 2A is a truncated cone-shaped contact roller 21A that can be pressed against the disc surface 12b of the drum disc 12. The contact roller 21A is rotatable, and its rotation axis is inclined at a predetermined angle with respect to the rotation axis of the drum disc 12. The angle is determined by the angle between the rotation axis of the truncated cone-shaped contact roller 21A and the generatrix.

[0025] When in use, the contact roller 21A is pressed with a predetermined force against the disc surface 12b of the drum disc 12. When the winch drum 10 is freely rotating and the rotation speed is within a predetermined allowable range, the contact roller 21A rotates in conjunction with the rotation of the drum disc 12. At this time, the contact roller 21A does not slip against the drum disc 12, and no friction occurs.

[0026] When the rotational speed of the winch drum 10 exceeds a predetermined allowable range and becomes excessive, the contact roller 21A does not follow the rotation of the drum disc 12 and slips, exerting a frictional force on the drum disc 12. This causes at least a decrease in the rotational speed of the drum disc 12, and in some cases, the rotation of the drum disc 12 stops.

[0027] As shown in Fig. 4(b), the irregular winding prevention device 2A has a contact roller 21A pressed against the drum disc 12, and its rotation shaft extension 211 extends on the central axis of a hollow stationary cylinder 22 and is rotatably supported. The stationary cylinder 22, the arrival mechanism 24 that supports it, and the support base 25 are the same as those in Fig. 3(b), so their description will be omitted. The arrival mechanism 24 can switch between a use state in which the contact roller 21 is pressed against the drum disc 12 (see solid line in Fig. 4(a)), and a non-use state in which the contact roller 21 is separated from the drum disc 12 (see dotted line in Fig. 4(a)). A specific example of the arrival mechanism 24 will be described later with reference to Fig. 7.

[0028] Figure 5(a) is a schematic cross-sectional view taken along line II-II in Figure 3(a), and (b) is a schematic cross-sectional view taken along line III-III in Figure 5(a), showing the state of the wild-winding prevention device 2 when the winch drum 10 rotates at a rotational speed within the allowable range. Figures 6(a) and 6(b) are schematic cross-sectional views similar to Figures 5(a) and 5(b), respectively, showing the state of the wild-winding prevention device 2 when the winch drum rotates excessively.

[0029] As shown in Figures 5(a) and 5(b), the rotation shaft extension 211 of the contact roller 21 is rotatably supported on the central axis of a hollow stationary cylinder 22. For this purpose, bearings 27 are provided on both end faces of the stationary cylinder 22. The stationary cylinder 22 does not rotate around the rotation axis of the contact roller 21 because it is supported by the rising shaft 23 as shown in Figure 3(b).

[0030] Within the hollow of the stationary cylinder 22, one end of at least one coil spring 28 is attached to the rotary shaft extension 211, and the coil spring 28 extends radially. In the illustrated example, two coil springs 28 extend in opposite directions from the rotary shaft extension 211. A contact plate 29 is attached to the other end of the coil spring 28. The size and shape of the contact plate 29 are not limited, but it preferably has a curved surface that conforms to the inner surface of the stationary cylinder 22. Furthermore, it is preferable that a friction material 30 be provided on the curved surface. The friction material 30 may be, for example, a sheet with an uneven surface, a sheet made of a non-slip material such as rubber, or a material similar to disc brake pads or drum brake linings. Instead of or in addition to the friction material 30, a friction material may be provided on the inner surface of the stationary cylinder 22.

[0031] As shown in Figure 5(a), the contact roller 21 is in contact with the drum disc 12 when in use. When the winch drum 10 rotates at a rotational speed within the allowable range, the contact roller 21 rotates following the drum disc 12 without slipping (see the black arrow). The contact roller 21 preferably has a friction material 26 on its circumferential surface to prevent it from slipping against the drum disc 12. The friction material 26 is also made of the same material as the friction material 30 described above.

[0032] 5(a) and 5(b), when the rotational speed of the winch drum 10 is within the allowable range, the contact plate 29 attached to the coil spring 28 is spaced apart from the inner surface of the stationary cylindrical body 22. The coil spring 28 is subjected to centrifugal force by rotating together with the rotary shaft extension 211, so it is stretched more than when stationary, but the contact plate 29 does not come into contact with the inner surface of the stationary cylindrical body 22. Because the centrifugal force is proportional to the square of the rotational speed, the coil spring 28 becomes longer as the rotational speed increases.

[0033] As shown in Figures 6(a) and 6(b), when the rotational speed of the winch drum 10 becomes excessive, the coil spring 28 expands due to centrifugal force, causing the contact plate 29 to contact the inner surface of the stationary cylindrical body 22. The upper limit of the rotational speed, centrifugal force, spring constant, spring length, and other factors are set to achieve this. The contact of the contact plate 29 with the inner surface of the stationary cylindrical body 22 generates friction, causing the rotational speed of the rotary shaft extension 211 to slow down and, in some cases, stop. As a result, a braking force is applied to the drum disc 12 via the contact roller 21, at least reducing the rotational speed of the drum disc 12. This prevents slack in the wire W during withdrawal, maintaining tension and preventing the wire W wound around the drum body 11 from becoming irregularly wound.

[0034] When the rotational speed of the drum disc 12 decreases, the centrifugal force acting on the coil spring 28 also decreases, causing the coil spring 28 to shorten, and the contact plate 29 again moves away from the inner surface of the stationary cylinder 22. By this time, the drum disc 12 has already decelerated, so there is no problem. After that, the wire W can be re-pulled out. In this way, the random winding prevention device of the present invention can be operated without any power source such as electricity or hydraulics. It can also be installed as an add-on to an existing winch.

[0035] The operation of the irregular winding prevention device 2 having the contact roller 21 has been explained above with reference to Figures 5 and 6, but this operation is also the same for the irregular winding prevention device 2A having the contact roller 21A shown in Figure 4.

[0036] Figure 7(a) is a schematic cross-sectional view of the line IV-IV in Figure 3(b) showing the state of the trigger mechanism 24 when the random winding prevention device is not in use, and (b) is a schematic cross-sectional view of the line IV-IV in Figure 3(b) showing the state of the trigger mechanism 24 when in use, and (c1) to (C4) are diagrams showing the schematic operation of the locking means and the releasing means.

[0037] The raising mechanism 24 has a spring 24c that can urge the contact roller 21 shown in FIG. 3(b) or the contact roller 21A shown in FIG. 4(b) so as to press it against the drum disc 12. In the illustrated example, the spring 24c is a torsion spring. The spring 24c is disposed concentrically around the raising shaft 23. One end 24c1 of the spring 24c is supported by an appropriate wall 24d that is formed integrally with the housing 24g.

[0038] The other end 24c2 of the spring 24c is connected to one end of a connecting rod 24a1, which is part of the lock operation unit 24a. The connecting rod 24a1 is connected to the main body of the lock operation unit 24a, which is located outside, through an opening 24h formed in the side of the cylindrical housing 24g. The arrival shaft 23 can rotate integrally with the connecting rod 24a1. The arrival shaft 23 is integral with the stationary cylindrical body 22, as shown in Figures 3(b) and 4(b).

[0039] In the unused state (contact rollers 21, 21A are in an upright position) shown in Figure 7(a), the lock operation part 24a is rotated clockwise against the elastic force of the spring 24c. This rotation can be performed by holding the lock operation part 24a with your fingers. The lock operation part 24a is held in this rotated position by a locking means (coil spring 24e and locking member 24f).

[0040] The locking means 24e, 24f can be released by the release operation part 24b. When released, the locking operation part 24a rotates counterclockwise by the elastic restoring force of the spring 24c, and assumes the state during use (the state in which the contact rollers 21, 21A are laid down) shown in Fig. 7(b). In the state shown in Fig. 7(b), the contact roller of the irregular winding prevention device is pressed against the drum disc.

[0041] The locking and unlocking operations of the lock operation unit 24a will be described with reference to Figures 7(c1) to (c4). The locking means includes a locking member 24f and a coil spring 24e arranged between the ceiling of the housing 24g and the locking member 24f. The locking member 24e is, for example, a substantially triangular prism arranged to have a vertical surface and an inclined surface. The unlock operation unit 24b is, for example, a U-shaped member, with a handle exposed outside the housing 24g and a lower end connected to the locking member 24f inside the housing 24g.

[0042] Figures 7(c1) and 7(c2) show the operation of rotating the connecting rod 24a1 of the lock operation unit from the in-use position to the out-of-use position. In Figure 7(c1), the connecting rod 24a1 contacts and pushes against the inclined surface of the locking member 24f, pushing up the locking member 24f and compressing the coil spring 24e, as shown in Figure 7(c2). This allows the connecting rod 24a1 to pass under the locking member 24f. Once the connecting rod 24a1 has passed, the restoring force of the coil spring 24e causes the locking member 24f to descend to its original position.

[0043] Figure 7(c3) shows the state when not in use. The connecting rod 24a1 abuts against the vertical surface of the locking member 24f and cannot rotate, so it is held in this position. To release it, as shown in Figure 7(c4), the release operating part 24b is lifted with a finger to raise the locking member 24f, allowing the connecting rod 24a1 to return to the position when in use. The mechanism shown in Figure 7 is one example, and various other configurations are possible.

[0044] Fig. 8 is a schematic front view of a winch equipped with a random winding prevention device of another embodiment. Fig. 9 is a schematic plan view of the winch of Fig. 8. Fig. 10 is a schematic view as seen from the arrow V of Fig. 9. Fig. 11 is a schematic view as seen from the arrow VI of Fig. 9. Fig. 12 corresponds to a schematic cross section taken along line VII-VII of Fig. 9, where (a) shows how to set up the random winding prevention device for use, and (b) shows the random winding prevention device in use.

[0045] The winch 1 in FIG. 8 has substantially the same configuration as the winch 1 shown in FIG.

[0046] The irregular winding prevention device 4 includes a contact plate 41 as a contact member for the drum disc 12. The contact plate 41 can be pressed against the peripheral surface of the drum disc 12 in a planar manner. The surface of the contact plate 41 facing the drum disc 12 is curved so as to fit the peripheral surface of the drum disc 12. Preferably, a friction material 46 is provided on the surface of the contact plate 41.

[0047] A spring claw (also called a "shrimp claw") 42 is provided adjacent to the contact plate 41 in the winch axial direction to constantly press the contact plate 41 against the drum disc 12 when the winch drum is freely rotating. The spring claw itself is a known metal fitting. The contact plate 41 is fixed to a contact plate connecting portion 48. The contact plate connecting portion 48 is integrally connected to the pressing body 42e of the spring claw 42 by welding or the like.

[0048] 12(a), the spring claw 42 has an upright portion 42a fixed to a plate-shaped spring claw seat 43. The spring claw seat 43 is fixed to a support frame 45 by a fastener 49, and the support frame 45 is fixed to the frame 16 of the winch 1. A hook portion 44 is formed near the upper end of the spring claw seat 43.

[0049] The lever body 42b of the spring claw 42 has two through-holes 42c and 42d. One of the through-holes 42c is rotatably connected to a through-hole in the standing portion 42a by a pin, and the other through-hole 42d is rotatably connected to a through-hole in the pressing body 42e by a pin. The pressing body 42e supports an engaging rod 42f so that it can move along its longitudinal direction. A coil spring 42g is installed around the engaging rod 42f inside the pressing body 42e. An annular portion 42h is formed at the tip of the engaging rod 42f, which extends upward from the top end of the pressing body 42e.

[0050] FIG. 12(a) shows the state before the contact plate 41 is set on the drum disc 12. The lever body 42b and pressing body 42e of the spring claw 42 are free, and the coil spring 42g is stretched. When setting the contact plate 41, the annular portion 42h of the engaging rod 42f is hooked onto the hook portion 44 (see black arrow). Next, as shown in FIG. 12(b), the lever body 42b is rotated downward (see black arrow). As a result, the engaging rod 42f is further pulled out from the pressing body 42e while engaged with the hook 44, and the coil spring 42g is compressed. This keeps the contact plate 41 pressed against the peripheral surface of the drum disc 12 at all times.

[0051] The contact plate 41 always exerts an appropriate frictional force on the drum disc 12, thereby preventing the rotation speed of the winch from becoming excessive and preventing the wire from being wound irregularly.

[0052] FIG. 13 is a partially enlarged view taken along the arrow V in FIG. 10, showing an adjustment tool 47 for adjusting the frictional force of the contact plate 41 against the drum disc 12. A pair of adjustment screws 47a protrude from the surface of the contact plate 41 opposite the surface facing the drum disc 12. The pair of adjustment screws 47a are ball screws that pass through a plate-shaped contact plate connecting portion 48. After appropriately setting the distance d between the contact plate connecting portion 48 and the contact plate 41, the contact plate connecting portion 48 is fixed with an adjustment nut 47b. This allows the frictional force of the contact plate 41 to be adjusted.

[0053] Fig. 14 is a schematic front view of a winch equipped with a random winding prevention device of yet another embodiment, Fig. 15 is a schematic view taken along arrow VII in Fig. 14, and Fig. 16 is an exploded view of the random winding prevention device.

[0054] The winch 1 in FIG. 14 has substantially the same configuration as the winch 1 shown in FIG. 1 except for the random winding prevention device 5.

[0055] The random winding prevention device 5 has a contact plate 51 that is constantly pressed against the peripheral surface 12a of the drum disc 12 when the winch drum is freely rotating. The random winding prevention device 5 has a support member that positions and supports the contact plate 51 so that the contact plate 51 is constantly pressed against the peripheral surface 12a of the drum disc 12.

[0056] 15 and 16, the support member for the contact plate 51 will be described. The support member has a long, rod-shaped frictional force adjustment lever 52, a pivot support member 56 for rotatably mounting the base end 52b of the frictional force adjustment lever 52 on the frame 16, and a pair of adjustment plates 53 arranged on either side of the frictional force adjustment lever 52.

[0057] The frictional force adjusting lever 52 is, for example, a flat rod-like member. A contact plate 51 is attached to the frictional force adjusting lever on the side facing the drum disc 12. The contact plate 51 has a curved surface that fits along the peripheral surface 12a of the drum disc 12.

[0058] The position of the contact plate 51 relative to the drum disc 12 can be changed by changing the position of the frictional force adjusting lever 52, which is rotatable around the base end 52a. This allows the frictional force that the contact plate 15 exerts on the drum disc 12 to be adjusted. For this purpose, a positioning hole 52a is drilled near the upper end of the frictional force adjusting lever 52. Furthermore, adjustment plates 53, which are arranged on both sides of the frictional force adjusting lever 52, extend along a circumference centered on the base end 52b of the frictional force adjusting lever 52, and are fixed to the frame 16 via leg members 54, for example, as shown in FIG. 15. A plurality of adjustment holes 53a are drilled in the adjustment plate 53 in the extending direction.

[0059] To obtain the desired frictional force from the contact plate 51, one of the multiple adjustment holes 53a is selected, and the selected adjustment hole 53a and the positioning hole 52a of the frictional force adjustment lever 52 are fixed using an appropriate fastener 55. This prevents the rotation speed of the winch drum from becoming excessive when unwinding the wire W. The frictional force from the contact plate 51 is set to a level that does not interfere with the operation of unwinding the wire W.

[0060] Fig. 17 is a schematic front view of a winch equipped with a random winding prevention device according to yet another embodiment. The winch 1 in Fig. 17 has substantially the same configuration as the winch 1 shown in Fig. 1, except for the random winding prevention device 6.

[0061] The irregular winding prevention device 6 has a configuration similar to that of a disc brake structure of an automobile or the like. The irregular winding prevention device 6 is equipped with brake pads 61a, 61b (collectively indicated by the reference numeral 61) that can be pressed against both disc surfaces 12b1, 12b2 of the drum disc 12, respectively. The pair of brake pads 61a, 61b are arranged opposite each other with the drum disc 12 in between. The irregular winding prevention device 6 further includes a caliper 62 that is installed across the periphery of the drum disc 12. The brake pad 61a, which can be pressed against one disc surface 12b1 on the wire W side, is fixed to one arm of the caliper 62.

[0062] The other arm of the caliper 62 is provided with an oil chamber 64 to which hydraulic pressure is applied from a hydraulic mechanism (not shown) through a hydraulic port 65, and a piston 63 that moves due to the hydraulic pressure in the oil chamber 64. A brake pad 61b that can be pressed against the plate surface 12b2 is fixed to the front surface of the piston 63.

[0063] The irregular winding prevention device 6 further includes a speed sensor 66 that detects the rotational speed of the drum disk 12, and a control unit 67 that receives a detection signal from the speed sensor 66 and controls a hydraulic mechanism (not shown) based on the detected rotational speed.

[0064] The operation of the irregular winding prevention device 6 will now be explained. When the winch drum 10 is rotating freely, and the rotation speed detected by the speed sensor 66 is within a predetermined allowable range, the control unit 67 does not hydraulically drive the piston 63, so that the piston 63 moves backward and the brake pads 61a, 61b are separated from the drum disc 12. When it is detected that the rotation speed of the winch drum 10 has exceeded the predetermined allowable range, the control unit 67 applies hydraulic pressure to the oil chamber 64 to push out the piston 63. This presses the brake pads 61a, 61b against the surface of the drum disc 12, applying the brake. As a result, irregular winding can be prevented.

[0065] In the illustrated example, the caliper 62 of the irregular winding prevention device 6 is a floating type having a piston 63 and an oil chamber 64 on only one side, but it may also be an opposed type caliper having a piston and an oil chamber on both sides. However, the floating type is preferable in that a part of the caliper does not protrude significantly toward the wire W side.

[0066] 18 is a partial front view showing a modified embodiment of the embodiment shown in FIG. 17. In this embodiment, the diameter of the drum disc 12 is not constant, but has a small diameter portion 121 on the wire W side and a large diameter portion 122 on the opposite side. In this configuration, a step is formed near the periphery of the drum disc 12. The irregular winding prevention device 6 is installed so that one arm of the caliper 62 fits within this step. As a result, the caliper 62 does not protrude from the disc surface 12b on the wire W side of the drum disc 12, so there is no risk of interference between the irregular winding prevention device 6 and the wire 6.

[0067] 17 and 18 may be further modified to a simplified form in which control based on detection by the speed sensor 66 is omitted. In this case, the hydraulic pressure is set to an appropriate constant value so that the brake pads 61 a, 61 b ​​always apply an appropriate frictional force to the drum disc 12 when the winch drum 10 is freely rotating.

[0068] The embodiments shown and described above are merely examples, and the present invention is not limited to these, and various modifications are possible. Furthermore, the present invention also includes configurations in which the configurations described in each embodiment are applied to other applicable embodiments. [Explanation of symbols]

[0069] 1 winch 10 winch drum 11 Drum body 12 drum discs 12a Drum disc periphery 12b drum disc surface 13 Motor 14 motor shaft 15 Reducer 16 frames 2, 2A, irregular winding prevention device 21 Contact roller 22 Stationary Cylinder 23 Arrival shaft 24 Origin mechanism 24a Lock operation part 24b Release operation part 24c torsion spring 24d fixed wall 24e coil spring 24f Locking member 24g housing 24h opening 25 Support stand 26 Friction material 27 Bearings 28 Coil spring 29 Contact plate 30 Friction material 4 Random winding prevention device 41 Contact plate 42 Banekan 42a Standing section 42b Lever body 42c, 42d connecting rod (through hole) 42e Pressing body 42f Engagement rod 42g coil spring 42h Annular section 43 Spring can seat 44 Hook part 45 Support Frame 46 Friction material 47 Adjustment tool 47a Adjustment screw 47b Adjustment nut 48 Contact plate connection part 49 Fixtures 5 Random winding prevention device 51 Contact plate 52 Friction adjustment lever 53 Adjustment plate 54 Leg members 55 Fixtures 56 Shaft support member 6 Random winding prevention device 61, 61a, 61b brake pads 62 caliper 63 Piston 64 Oil room 65 hydraulic ports 66 Speed ​​sensor 67 Brake control unit 121 Large diameter drum disc 122 Drum disc small diameter part W Wire Rope

Claims

1. A random winding prevention device (2, 2A, 4, 5, 6) is provided on a winch drum (10) including a cylindrical drum body (11) on which a wire (W) is wound and circular drum discs (12) located at both ends of the drum body (11), and prevents random winding of the wire (W) when the wire (W) is pulled out from the winch drum (10) in a freely rotatable state, A random winding prevention device characterized by having a contact member (21, 21A, 41, 51, 61) that can be pressed against the peripheral surface (12a) or disc surface (12b) of the drum disc (12) to stop or suppress the rotation of the winch drum (10).

2. the contact member (21) is a cylindrical contact roller (21) that can be pressed against the peripheral surface (12a) of the drum disk (12); The device for preventing irregular winding as described in claim 1, characterized in that the contact roller (21) pressed against the peripheral surface (12a) of the drum disc (12) rotates in accordance with the rotation of the drum disc (12) when the rotational speed of the winch drum (10) is within a predetermined allowable range, and its rotation is stopped or suppressed when the rotational speed of the winch drum (10) becomes excessive.

3. the contact member (21A) is a truncated cone-shaped contact roller (21A) that can be pressed against the disc surface (12b) of the drum disc (12); The device for preventing irregular winding as described in claim 1, characterized in that the contact roller (21A) pressed against the disc surface (12b) of the drum disc (12) rotates in accordance with the rotation of the drum disc (12) when the rotational speed of the winch drum (10) is within a predetermined allowable range, and its rotation is stopped or suppressed when the rotational speed of the winch drum (10) becomes excessive.

4. a rotary shaft extension (211) of the contact roller (21, 21A) is rotatably supported on the central axis of a hollow stationary cylinder (22); The rotary shaft extending mechanism has at least one coil spring (28) extending radially from the rotary shaft extension within the hollow of the stationary cylindrical body (22), and a contact plate (29) attached to a tip of the coil spring (28), When the rotational speed of the winch drum (10) is within an allowable range, the contact plate (29) is spaced from the inner surface of the stationary cylindrical body (22); A device for preventing irregular winding as described in claim 2 or 3, characterized in that when the rotational speed of the winch drum (10) becomes excessive, the coil spring (28) expands due to centrifugal force, and the contact plate (29) comes into contact with the inner surface of the stationary cylinder (22).

5. 4. The device for preventing irregular winding according to claim 2, further comprising a trigger mechanism (24) that can switch between a use state in which the contact roller (21, 21A) is pressed against the drum disc (12) and a non-use state in which the contact roller (21, 21A) is separated from the drum disc (12).

6. the contact member (21) is a contact plate (41) that can be pressed against the peripheral surface (12a) of the drum disk (12) in a planar manner along the peripheral surface (12a), a spring can (42) having a pressing body (42e) connected to the contact plate (41) for constantly pressing the contact plate (41) against the drum disc (12); a spring hook seat (43) to which the erected portion (42a) of the spring hook (42) is fixed and which has a hook portion (44) for hooking the annular portion (42h) of the spring hook (42); 2. The device for preventing irregular winding according to claim 1, further comprising a stationary support frame (45) for supporting the spring can seat (43).

7. the contact member (51) is a contact plate (51) that can be pressed against the peripheral surface (12a) of the drum disk (12) in a planar manner along the peripheral surface (12a), a support frame that supports the contact plate (51) so that the contact plate (51) is always pressed against the peripheral surface (12a) of the drum disk (12); 2. The device for preventing irregular winding according to claim 1, wherein the support frame is provided with means for adjusting the position of the contact plate (51) relative to the drum disc (12).

8. the contact member (61) is a pair of brake pads (61a, 61b) arranged so as to be able to press against both disc surfaces of the drum disc (12), a caliper (62) disposed across the periphery of the drum disc (12) and supporting the pair of brake pads (61a, 61b); 2. The device for preventing irregular winding according to claim 1, further comprising a hydraulic mechanism for moving at least one of the brake pads (61a, 61b).

9. a speed sensor (66) for detecting the rotation speed of the drum disc (12); 9. The device for preventing irregular winding according to claim 8, further comprising a control unit (67) for controlling the hydraulic mechanism based on the rotational speed detected by the speed sensor (66).

10. A winch equipped with the random winding prevention device according to any one of claims 2, 3, 6, 7, 8 and 9.

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