JPH1143291A - Safety device for winch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device capable of improving safety with a simple structure. SOLUTION: This winch is provided with a drum 1, a wire which is wound around the drum 1 and for winding up and down a load, an input shaft 7 connected to the drum 1 through a speed reducing mechanism 17, a moving member 8 which is screw-connected to the input shaft 7 and which is capable of displacing in an axial direction, a ratchet wheel 9 mounted on the input shaft 7 freely to rotate between the moving member 8 and a stopper part formed on the input shaft 7, a brake pad 11 and a disk hub 10 arranged so as to hold the ratchet wheel 9 from both side surfaces, and a rock claw for allowing positive rotation and for obstructing reverse rotation. In this case, a locking member 25 is arranged on a main body frame 4 side for rotatably supporting the drum 1, and a drum rotation obstructing mechanism is arranged on a handle 23 side for rotatively operating the drum 1, by which the drum 1 freely rotates by releasing the engagement of the locking member 25 keeping the handle 23 held, and the rotation of the drum 1 is obstructed by engaging with the locking member 25 with the holding of the handle 23 released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch safety device.

[0002]

2. Description of the Related Art Conventionally, winches have been used for indexing operations and lifting operations of heavy objects.

As shown in FIG. 3, for example, a conventional winch winds up a load through a drum 1 and a wire 2 wound around the drum 1, and stops the wound load at an arbitrary position. A brake mechanism 3 is provided for unwinding.

The drum 1 is rotatably supported on a main body frame 4 via a support shaft 5, and a large gear 6 is integrally fixed to the right side of the drum 1. Therefore, the drum 1 rotates integrally with the large gear 6.

[0005] One end of a wire 2 is connected to the drum 1, and the drum 2 is rotated to take up and rewind the wire 2, thereby winding up and rewinding the load connected to the other end of the wire 2. I do.

As shown in FIG. 4, the brake mechanism 3 has an input shaft 7 for rotationally driving the drum 1 and is screwed to the input shaft 7 to move in the axial direction with the forward and reverse rotation of the input shaft 7. And a ratchet wheel 9, a disk hub 10 and a brake pad 11, which are rotatably mounted on the input shaft 7, and a lock claw 12 which engages with the ratchet wheel 9.

The input shaft 7 is arranged in parallel with the support shaft 5 of the drum 1, and both ends are rotatably supported by the body frame 4 and the cover 14 via the support metal 13.
A stopper washer 15 is fixed outside the two support metals 13, and the stopper washer 15 regulates the movement of the input shaft 7 in the axial direction.

An external thread 16 is formed on the input shaft 7 at a position corresponding to the large gear 6, and a small gear 8 as a moving member is screwed to the external thread 16. Small gear 8
Are engaged with the large gear 6, and the small gear 8 and the large gear 6 constitute a speed reduction mechanism 17.

Further, on the input shaft 7, adjacent to the small gear 8, a disk hub 10, a brake pad 11, a ratchet wheel 9, a brake pad 11, a disk hub 10
It is installed in the order of. These ratchet wheels 9,
The disc hub 10 and the brake pad 11 are connected to the input shaft 7.
The disk hub 10 on the right end side is axially positioned by a stopper 18 formed on the input shaft 7.

A washer 20 is fixed to the input shaft 7 on the left side surface of the small gear 8 via a retaining ring 19, and the small gear 8 is positioned by the washer 20.

The ratchet wheel 9 allows the ratchet wheel 9 to rotate forward (in the direction of arrow C in FIG. 5, ie, clockwise as viewed from the right end of the input shaft 7).
A lock claw 12 for preventing reverse rotation is engaged.

The lock pawl 12 is rotatably mounted on a pivot 21 fixed to the main body frame 4 and is urged by a torsion spring 22 in a direction to engage with the ratchet wheel 9.

The input shaft 7 has a right end protruding outward from the cover 14, and a handle 23
Are connected.

With such a configuration, when the load is to be wound, when the handle 23 attached to the input shaft 7 is rotated forward, the small gear 8 serving as a moving member screwed to the input shaft 7 approaches the ratchet wheel 9. The ratchet wheel 9 is displaced in the direction (to the right in FIG.
Between the disc hub 10 and the stopper portion 18 via the brake pad 11. Therefore, the input shaft 7, the small gear 8, the ratchet wheel 9, the disk hub 10 and the brake pad 11 can rotate integrally, and the drum 1 can be rotated via the large gear 6 meshing with the small gear 8.
Can be rotated in the winding direction to wind up the load. At this time, if the lock claw 12 is set on the ratchet wheel 9, the load can be stopped at an arbitrary position.

On the other hand, when the load is to be unloaded, the lock 2 is kept set on the ratchet wheel 9, that is, the handle 2 is released without releasing the lock claw 12.
When the gear 3 is rotated in the reverse direction, the moving member (small gear) 8 is displaced in the direction away from the ratchet wheel 9 (to the left in FIG. 4), and the disk hub 10, the brake pad 11 and the ratchet wheel 9 are separated from each other. Is stopped, the input shaft 7 and the small gear 8 are rotatable, and the drum 1 is rotated reversely via the large gear 6 meshing with the small gear 8, so that the load is unloaded.

When the rotation of the handle 23 is stopped during the operation of unloading the load, the small gear 8
Are relatively driven in the same direction as the winding. Then, the small gear 8 is displaced in a direction approaching the ratchet wheel 9, and the ratchet wheel 9 is sandwiched between the small gear 8 and the stopper portion 18 via the brake pad 11 between the disc hubs 10 and the input shaft 7. , The small gear 8, the ratchet wheel 9, the disc hub 10, and the brake pad 11 are integrated to stop the load. That is, the load can be safely unloaded according to the reverse rotation of the input shaft 7.

[0017]

However, in such a conventional winch, a ratchet wheel 9 is provided.
If the lock claw 12 that prevents reverse rotation of the lock claw 12 is not set on the ratchet wheel 9 due to, for example, a poor assembly, a broken torsion spring, or rust on the pivot shaft of the lock claw, release the hand from the handle. Then, the drum rotates in the direction of unwinding the load, and the load is unwound. Particularly, when the winch is used for lifting and lowering work, there is a possibility that the load may drop and an unexpected accident may occur.

The present invention has been made in view of the above, and it is an object of the present invention to provide a winch safety device which has a simple structure and can further improve safety.

[0019]

In order to solve the above-mentioned problems, the invention according to claim 1 is connected to a drum via a drum, a wire wound around the drum to lift and lower a load, and a speed reduction mechanism. An input shaft, a movable member screw-coupled to the input shaft and capable of being displaced in the axial direction along the input shaft, and a rotatably mounted between the movable member and a stopper formed on the input shaft with respect to the input shaft. A winch comprising a ratchet wheel provided, a brake pad and a disc hub disposed so as to sandwich the ratchet wheel from both sides, and a lock claw that allows normal rotation of the ratchet wheel and prevents reverse rotation. A state in which a locking member is provided on a main body frame side rotatably supporting the drum, and a handle is gripped on a handle side for rotating the drum. A drum rotation preventing mechanism is provided which engages with the locking member in a state where the engagement with the locking member is released to make the drum free to rotate and the grip of the handle is released, thereby preventing rotation of the drum. Features.

According to a second aspect of the present invention, there is provided the winch safety device according to the first aspect, wherein the drum rotation preventing mechanism is axially slidable on a handle provided on a body frame side and on a handle. An engaging pin supported by the locking member and capable of being disengaged from the locking member; a spring for urging the engaging pin in an engaging direction; and a handle provided integrally with the handle, the engaging pin being held at the same time as the handle. And a lever for moving the pin in the anti-engaging direction.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those of the conventional winch shown in FIGS. 3 to 5 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a longitudinal sectional view of a winch according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a drum rotation preventing mechanism.

As shown in FIG. 1, this winch winds up a load via a drum 1 and a wire 2 wound around the drum 1 and winds it at an appropriate speed to stop the wound up load at an arbitrary position. The apparatus includes a brake mechanism 3 for lowering the drum 1 and a drum rotation prevention mechanism 24 that can prevent the rotation of the drum 1 while the load is wound around the drum 1.

The brake mechanism 3 includes an input shaft 7 connected to the drum 1 via a speed reduction mechanism 17 and the male screw portion 1 of the input shaft 7.
6, a small gear 8 as a moving member which can be displaced in the axial direction along the input shaft 7, a disk hub 10 fitted to the input shaft 7, and two brake pads 11 adjacent to the disk hub 10. And a ratchet wheel 9 sandwiched between the brake pads 11 and a lock claw 12 for preventing the ratchet wheel 9 from rotating in the reverse direction.

The drum rotation preventing mechanism 24 is shown in FIGS.
As shown in FIG. 2, a locking member 25 provided integrally with the main body frame 4, an engagement pin 26 supported by the handle 23 slidably in the axial direction and capable of being disengaged from the locking member 25, A spring 27 for urging the pin 26 in the engagement direction, and the engagement pin 26 is integrally provided on the handle 23 and is moved in the anti-engagement direction with respect to the locking member 25 in a state of being gripped simultaneously with the handle 23. And a lever 28 to be operated.

The engaging member 25 is provided integrally with the main body frame 4 and is constituted by a bar-like member projecting upward.

The handle 23 is disposed laterally at the tip of the arm 29 and is connected so as to be relatively rotatable. A nut 30 is screwed into a protruding portion of the handle 29 inward (toward the body frame 4) from the arm 29. It is worn and retained.

The engaging pin 26 has a large-diameter portion 31 substantially at the center and small-diameter portions 32 extending on both left and right sides.

A pin hole 35 having a large-diameter hole 33 and a small-diameter hole 34 is formed in the shaft center of the handle 23. The large-diameter hole 31 of the pin hole 35 is used to connect the large-diameter portion 31 of the engaging pin 26. The right small-diameter portion 32 is fitted in the small-diameter hole 34 so as to be slidable in the axial direction.

Between the large diameter portion 31 of the engagement pin 26 and the step 36 of the pin hole 35, the engagement pin 26 is always held by the locking member 2.
A spring 37 for urging in a direction to be engaged with 5 is interposed.

Further, a pin 38 orthogonal to the engaging pin 26 is implanted at the right end of the engaging pin 26, and the pin 38 slides into an axial long hole 39 formed in the handle 23. It is movably fitted.

At the right end of the handle 23, a boss 40 projecting downward is integrally provided, and a pin 41 is implanted on the boss 40.

An arm 42 is rotatably connected between the pin 38 of the engaging pin 36 and the pin 41 of the boss 40, and the arm 42 is connected to a through-hole 44 formed in the handle 23. It protrudes outward. At the lower end of the arm 42, a lever 28 that is inclined downward along the handle 23 is provided integrally. The connecting portion of the arm 41 with the pin 38 is connected by a long hole 43.

When the load is to be hoisted or unwound, the lever 41 is gripped together with the handle 23, the arm 41 is rotated in the direction of arrow A in FIG. It moves in the direction of arrow B in FIG. 1 along the long hole 38 via the pin 37 against the force. That is, the engagement pin 26 is
, In the disengagement direction (anti-engagement direction) to release the engagement. As a result, the handle 23 can rotate freely, and the drum 1 is in a rotation-free state.

On the other hand, when the load is to be stopped at an arbitrary position, the grip is released by releasing the handle from the handle 23 and the lever 28, and the engaging pin 26 is biased by the spring 36 so as to be counter-arrowed in FIG. In the direction B, the engaging pin 26 engages with the locking member 25.

In this state, since the handle 23 is fixed to the main body frame 4 side, the rotation of the drum 1 is prevented.

With such a configuration, when a load is to be wound, the small gear 8 as a moving member screwed to the input shaft 7 approaches the ratchet wheel 9 when the handle 23 attached to the input shaft 7 is normally rotated. The ratchet wheel 9 is displaced in the direction (to the right in FIG.
Between the disc hub 10 and the stopper portion 18 via the brake pad 11. Therefore, the input shaft 7, the small gear 8, the ratchet wheel 9, the disk hub 10 and the brake pad 11 can rotate integrally, and the drum 1 can be rotated via the large gear 6 meshing with the small gear 8.
Can be rotated in the winding direction to wind up the load. At this time, if the lock pawl 12 is set on the ratchet wheel 9 and the operating lever 33 is operated to engage the engaging pin 26 with the engaging hole 25 of the drum 1, the load is stopped at an arbitrary position. And the rotation of the drum 1 can be completely prevented.

On the other hand, when the load is to be unloaded, the lock 2 is kept set on the ratchet wheel 9, that is, the handle 2 is released without releasing the lock claw 12.
When the gear 3 is rotated in the reverse direction, the moving member (small gear) 8 is displaced away from the ratchet wheel 9 (to the left in FIG. 2), and the disc hub 10, the brake pad 11 and the ratchet wheel 9 are separated from each other. Is stopped, the input shaft 7 and the small gear 8 are rotatable, and the drum 1 is rotated reversely via the large gear 6 meshing with the small gear 8, so that the load is unloaded.

When the rotation of the handle 23 is stopped during the operation of unloading the load, the small gear 8
Are relatively driven in the same direction as the winding. Then, the small gear 8 is displaced in a direction approaching the ratchet wheel 9, and the ratchet wheel 9 is sandwiched between the small gear 8 and the stopper portion 18 via the brake pad 11 between the disc hubs 10 and the input shaft 7. , The small gear 8, the ratchet wheel 9, the disc hub 10, and the brake pad 11 are integrated to stop the load. That is, the load can be safely unloaded according to the reverse rotation of the input shaft 7.

Since the drum rotation prevention mechanism 24 is provided, when the load is wound up and stopped at an arbitrary position, the user releases the hand from the handle 23 to cause the engagement pin 26 to engage the locking member 25. , The handle 23 is fixed to the body frame 4 side, and rotation of the drum 1 is prevented. For this reason, even when the lock claw 12 that prevents the reverse rotation of the ratchet wheel 9 is not set on the ratchet wheel 9 due to, for example, a defective assembly, a damaged torsion spring, or rust on the pivot shaft of the lock claw. In addition, the drum 1 does not rotate in the load unwinding direction. In particular, when the winch is used for lifting work, the load can be safely prevented from lowering, so that the safety can be further improved.

Further, according to the drum rotation preventing mechanism 24, the gripping of the engaging pin 26 is released by simultaneously gripping the handle 23 and the lever 28, and the grip is released by releasing the hand from the handle 23 and the lever 28. When the handle 2 is released, the engaging pin 26 engages with the locking member 25.
Since the fixing member 3 is fixed to the main body frame 4 side, the rotation of the drum 1 can be prevented with one touch in the operation related to the operation of the winch.

[0042]

As is apparent from the above description, according to the first aspect of the present invention, a drum, a wire wound around the drum to raise and lower a load, and an input shaft connected to the drum via a speed reduction mechanism. A moving member screw-coupled to the input shaft and capable of being displaced in the axial direction along the input shaft; and a ratchet wheel rotatably mounted on the input shaft between the moving member and a stopper formed on the input shaft. Rotating the drum at a winch comprising: a brake pad and a disc hub disposed so as to sandwich the ratchet wheel from both sides; and a lock claw that allows the ratchet wheel to rotate forward and prevents reverse rotation. A locking member is provided on the body frame side that freely supports, while the locking is performed on the handle side that rotates the drum while holding the handle. Since the engagement with the material is released and the drum is made to be free of rotation, and the grip of the handle is released, a drum rotation prevention mechanism that engages with the locking member to prevent rotation of the drum is provided. When the grip is released by releasing the hand, the rotation of the drum is always stopped. Therefore, the lock claw 12 for preventing the reverse rotation of the ratchet wheel 9 is, for example, defectively assembled, the torsion spring is damaged, the pivot shaft of the lock claw is used. Even when the drum 1 is not set on the ratchet wheel 9 due to rust on the drum 1, the drum 1 does not rotate in the load unwinding direction. In particular, when the winch is used for lifting work, it is possible to completely prevent the load from dropping.

Therefore, an accident can be prevented, and safety can be further improved.

According to the second aspect of the present invention, the same effects as those of the first aspect of the invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a winch according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a drum rotation prevention mechanism according to one embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional winch.

FIG. 4 is a longitudinal sectional view of a conventional winch.

FIG. 5 is a side view showing a conventional winch brake mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drum 2 ... Wire 4 ... Body frame 7 ... Input shaft 8 ... Small gear (moving member) 9 ... Ratchet wheel 10 ... Disc hub 11 ... Brake pad 12 ... Lock claw 17 ... Reduction mechanism 23 ... Handle 24 ... Drum rotation prevention Mechanism 25: Locking member 26: Engagement pin 27: Spring 28: Lever

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B66D 5/32 B66D 5/32

Claims (2)

[Claims] 1. A drum, a wire wound around the drum for hoisting and unwinding a load, an input shaft connected to the drum via a speed reduction mechanism, and an axial direction along the input shaft which is screw-connected to the input shaft. A movable member that can be displaced, a ratchet wheel rotatably mounted between the movable member and a stopper formed on the input shaft with respect to the input shaft, and the ratchet wheel are disposed so as to sandwich the ratchet wheel from both sides. In a winch including a brake pad and a disc hub, and a lock claw that allows forward rotation of the ratchet wheel and prevents reverse rotation, a locking member is provided on a body frame side that rotatably supports the drum, On the other hand, on the handle side for rotating the drum, the engagement with the locking member is released while the handle is gripped, and the drum is made to be free to rotate. Safety device winch, characterized in while releasing the grip of dollars to the provision of the drum rotation preventing mechanism for preventing rotation of the engaging drum with the locking member. 2. The winch safety device according to claim 1, wherein said drum rotation preventing mechanism is supported by a locking member provided on a main body frame side and a handle so as to be slidable in the axial direction. An engaging pin detachable from a member, a spring for urging the engaging pin in an engaging direction, and a handle provided integrally with the handle, and holding the engaging pin in the anti- And a lever for moving the winch.