JP3311730B2 - winch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for, for example, a heavy-duty winch for fastening a belt wrapped around an outer periphery of a root pot and a frame buried in soil during tree planting, and various other uses. About the winch.

[0002]

2. Description of the Related Art Conventionally, there has been known a winch provided with a ratchet mechanism between a take-up shaft mounted on a pair of brackets and the bracket, which allows forward rotation of the take-up shaft but prevents reverse rotation. As shown in a plan view of FIG. 6 (B), such a known winch has a pair of brackets 2a and 2b erected by bending a substrate 1 made of a steel plate into a substantially U-shaped cross section. A take-up shaft 4 is rotatably mounted on bearing holes 3 and 3 formed in 2a and 2b, and a slot 5 is formed in the take-up shaft 4 for inserting an end of a belt.

[0003] The ratchet mechanism includes one bracket 2a.
A ratchet wheel 6 fixed to the shaft end of the take-up shaft 4 inserted from the bracket, and a ratchet claw 8 rotatably supported by a pin shaft 7 provided on the bracket 2a adjacent to the ratchet wheel 6. It is composed of Ratchet claw 8
Is urged by a helical spring 9 extrapolated on the pin shaft 7 so that the claw portion 8a meshes with the ratchet teeth 6a of the ratchet wheel 6. Further, a lever engaging portion 10 composed of a hexagonal shaft is provided at the shaft end of the winding shaft 4. Accordingly, when the winding shaft 4 is rotated forward by the lever via the lever engaging portion 10, the ratchet pawl 8 is retracted while retracting the pawl portion 8a while rotating against the helical spring 9, and the ratchet teeth 6a are retracted.
While allowing the ratchet wheel 6 to rotate forward, but the claw portion 8a meshes with the ratchet teeth 6a in the biting direction in the reverse rotation direction of the winding shaft 4, and the ratchet wheel 6
To prevent reversal.

[0004]

Since a winch is usually used for winding a belt or a cable while pulling it, it is required to withstand a strong fastening force. In particular, a heavy-duty winch that fastens a root pot and a frame with a belt for tree planting requires stability after tree planting and a fastening force of several tons is applied, so it can withstand this sufficiently. Must be structured.

However, when a known winch as described above is used for heavy loads, the load after fastening is reduced by the bracket 2a.
Is concentrated on the meshing portion of the ratchet teeth 6a and the claw portions 8a at positions deviated to the outside of the armature, so that distortion occurs everywhere. In particular, since the ratchet pawl 8 is cantilevered by the pin shaft 7, when a large load is applied in the reverse direction by the ratchet wheel 6, the ratchet pawl 8 itself is not only deformed and deformed in a direction to escape to the side, As a result, the pin shaft 7 is deformed so as to bend, and furthermore, the strain is applied to the bracket 2a, and there is a possibility that the claw portion 8a may be detached from the ratchet teeth 6a.

[0006] As described above, the known winch is not suitable for heavy loads, and has a problem in that it can be reversed and cannot be reused after deformation. Therefore, if reinforcement is applied to withstand heavy loads while maintaining the conventional structure, it is necessary to increase the number of parts and to increase the thickness and diameter of the component parts. There is a disadvantage of increasing the size and increasing the weight.

Further, in the known winch, since the ratchet wheel 6 and the ratchet claw 8 are completely exposed, there is a danger that the body such as a finger of an operator or other foreign matter may be caught.

[0008]

SUMMARY OF THE INVENTION The present invention provides a winch which solves the above-mentioned problems, and is constituted by a winch provided between a winding shaft mounted on a pair of brackets and the bracket. In the meantime, in a winch provided with a ratchet mechanism for allowing forward rotation of the winding shaft but preventing reverse rotation, the ratchet mechanism has an internal tooth shape formed along an inner periphery of a shaft insertion hole formed in a bracket. It comprises a ratchet tooth and a ratchet pawl which is provided so as to be able to advance and retreat in the radial direction of the winding shaft and is urged to mesh with the ratchet tooth by a spring.

In this case, in a preferred embodiment, a claw storage chamber extending radially from the shaft end of the winding shaft inserted through the shaft insertion hole and extending from the shaft end to the inner peripheral portion of the ratchet tooth is formed. A ratchet claw is provided in the claw storage chamber, and the ratchet claw is located on an inner peripheral portion of the ratchet tooth and protrudes from the claw storage chamber toward the ratchet tooth. A claw shaft portion eccentrically displaced and located near the shaft end of the winding shaft and slidably housed in the claw storage chamber; and a protective cover attached to the shaft end of the winding shaft and the claw shaft. A compression spring is interposed between the head and the part.

Further, in a preferred embodiment, an operation piece for detaching the pawl portion of the ratchet pawl from the ratchet teeth is extended from the ratchet pawl to the outside of the protective cover, and the ratchet pawl is detached from the ratchet teeth. A holding means is provided for holding the operation piece to the protective cover in a detachable manner in the state.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 6 (A), the winch is formed by bending a substrate 11 made of a steel plate into a substantially U-shaped cross section, thereby erecting a pair of brackets 12a and 12b. A take-up shaft 13 is mounted around 12b, and a ratchet mechanism is provided between one of the brackets 12a and the take-up shaft 13 to allow the take-up shaft 13 to rotate forward but prevent reverse rotation.

In the illustrated embodiment, the take-up shaft 13 has a pair of flanges formed by forming a slot 14 by spacing a pair of shaft pieces 13a and 13b obtained by dividing a cylindrical shaft in the radial direction. And a lever engaging portion 17 composed of a hexagonal shaft is provided at one shaft end protruding from the washer 16. The take-up shaft 13 is mounted on both brackets 12a and 12b via a shaft insertion hole 18 of one bracket 12a and a shaft support hole 19 of the other bracket 12b, and one washer 15 is inserted into the bracket 12a. It is arranged on the side surface, and the other washer 16 is arranged on the outer surface of the bracket 12b. Although not shown, a bearing means for supporting the winding shaft 13 may be provided in the vicinity of the shaft insertion hole 18 instead of or in addition to the washer 15.

The ratchet mechanism includes the bracket 12a
And a ratchet pawl 22 which is formed along the inner periphery of the shaft insertion hole 18 and a ratchet pawl 22 which is provided so as to be able to advance and retreat in the radial direction of the winding shaft 13. 22 is a spring 2 such as a compression coil spring.
1 is urged to mesh with the ratchet teeth 20.

At the shaft end 13e of the winding shaft 13 inserted through the shaft insertion hole 18, a claw storage chamber 23 extending in the radial direction is formed, and the ratchet claw 22 is slidable in the claw storage chamber 23. Is stored in In the case of the illustrated embodiment, the claw storage chamber 23
Is formed by a space between a pair of shaft pieces 13a and 13b constituting the winding shaft 13, and a shaft end 13 is provided in a state where the winding shaft 13 is mounted on the brackets 12a and 12b.
e has a depth from the end face to the inner peripheral portion of the ratchet tooth 20.

The ratchet pawl 22 is located on the inner peripheral portion of the ratchet teeth 20 and is provided from the pawl housing chamber 23 to the ratchet teeth 2.
0, and the nail storage chamber 2 which is refracted and deflected from the nail 24 and is located near the end face of the shaft end 13e.
3 is provided with a claw shaft portion 25 slidably mounted therein.

The shaft end 13e inserted through the shaft insertion hole 18
Is configured to be covered by a cup-shaped protection cover 26, and the bottom wall 26a of the protection cover 26 is fixed to the end face of the shaft end 13e by fixing means 27. At this time, the spring 21 is interposed between the peripheral wall 26b of the protective cover 26 and the tail end of the claw shaft portion 25, and thereby the ratchet claw 22 is
Protrudes the claw portion 24 from the claw storage chamber 23 and ratchet teeth 2
0 meshes.

In the case of the illustrated embodiment, the ratchet pawl 22
Are projected from the claw shaft portion 25 and the bottom wall 26 of the protective cover 26
and a guide means 28 comprising a pin or the like which can abut the a. Further, an operation piece 29 for detaching the claw portion 24 of the ratchet claw 22 from the ratchet teeth 20 is directed from the claw shaft portion 25 to the outside of the protective cover 26. Extend the ratchet claw 22
The operation piece 29 is detached from the ratchet teeth 20 in a state where
Means 3 for detachably holding the cover with the protective cover 26
0 is provided.

According to the above configuration, as shown in FIG.
Inserting the end of a belt or the like into the slot 14 of the winding shaft 13,
With the end of the belt or the like engaged with the peripheral surface of the take-up shaft 13, the take-up shaft 13 is
Is rotated forward, the ratchet pawl 22 retreats against the spring 21 and retracts the pawl portion 24 so that the ratchet teeth 20
While the take-up shaft 13 is allowed to rotate forward,
The claw 24 meshes with the ratchet teeth 20 in the biting direction with respect to the reverse rotation direction 3 to prevent the winding shaft 13 from rotating in the reverse direction.

As described above, since a fastening force of several tons is applied to the winch for heavy loads, the load after fastening is concentrated on the meshing portion between the ratchet teeth 20 and the ratchet pawls 22. As shown in FIG. 6 (A), the ratchet teeth 20 are formed in the shape of internal teeth along the inner periphery of the shaft insertion hole 18 of the bracket 12a, and the ratchet pawl 22 is configured to accommodate the pawl of the winding shaft 13. Since the claw portion 24 is configured to protrude from the chamber 23, the ratchet teeth 20 to be meshed with the claw portion 2
4 are located within the thickness of the bracket 12a.
Therefore, unlike the conventional example shown in FIG. 6 (B), there is provided a structure which does not cause distortion everywhere and can suitably withstand a heavy load. Moreover, even when the winding shaft 13 rotates during winding and rewinding, the ratchet mechanism including the ratchet teeth 20 and the ratchet pawls 22 is disposed within the thickness of the bracket 12a and is not exposed to the outside. Also, there is no danger of catching foreign matter.

By the way, when rewinding is performed after winding the belt or the like, as shown in FIG. The take-up shaft 13 can be allowed to reverse in this state. In the case of the illustrated example, the operation piece 29 is formed of a substantially L-shaped member rotatably connected to the claw shaft portion 25, and the holding means 30 is formed of a substantially L-shaped window hole opened in the protective cover 26. The tip of the operation piece 29 is projected from the window hole. Therefore, when the ratchet pawl 22 is slid against the spring 21 by pushing the operation piece 29, the pawl portion 24 is separated from the ratchet teeth 20. Then, when the operation piece 29 is moved along the horizontal hole 31 of the holding means 30, the claw 24 is moved to the side of the ratchet teeth 20, and the operation piece 29 is further rotated to turn the vertical hole of the holding means 30. When the ratchet claw 22 is fitted into the portion 32, the ratchet claw 22 can be held in a state where the claw portion 24 is moved to the side. That is, in this state, even if the ratchet pawl 22 receives the resilient biasing force of the spring 21, the ratchet pawl 22 is laterally moved and deviated, so that it no longer meshes with the ratchet teeth 20. When returning the ratchet claw 22 to the original position again, the operation piece 29 is required.
The claw portion 24 may be engaged with the ratchet teeth 20 while being moved along the horizontal hole portion 31 while being pressed and pushed back from the vertical hole portion 32 to the horizontal hole portion 31.

FIG. 4 shows another embodiment of the operation piece and the holding means. The operation piece 29 is configured to extend from the claw shaft portion 25 of the ratchet claw 22 beyond the spring 21 to the outside of the protective cover 26, and forms a hook portion 33. The holding means 30 has a window hole 34 through which the operation piece 29 can be inserted. Therefore, as shown in FIG. 4A, when the operation piece 29 is picked and pulled from the state where the claw portion 24 of the ratchet claw 22 is engaged with the ratchet tooth 20, the claw portion 24 is opposed to the spring 21. Withdraw from
In this state, when the operation piece 29 is moved to the side to lock the hook 33 in the window hole 34, the ratchet claw 22 is held while the spring 21 is compressed, and the winding shaft 13 is allowed to reverse. When the ratchet claw 22 is returned to the original position again, the operation piece 29 is moved to the side to release the holding state of the hook portion 33 and the window hole 34, and the ratchet claw 22 is resiliently returned by the spring 21. Then, the claw portion 24 is automatically engaged with the ratchet teeth 20.

FIG. 5 shows still another embodiment of the operation piece and the holding means. The operation piece 29 is composed of a spring piece 36 bent substantially in a V shape, and a pair of free ends is connected to a connection portion 35 provided on the claw shaft portion 25 of the ratchet claw 22, and the V shape is bent. Is extended beyond the spring 21 so as to be inserted through the window hole 38 of the protective cover 26, and V
Locking bent portions 37, 37 are formed in the middle of the shaped leg. The holding means 30 includes a pair of pins 39 fixed to the inside of the protective cover 26. Therefore, when the operation piece 29 is pinched and pulled from the state in which the claw portion 24 of the ratchet claw 22 is engaged with the ratchet tooth 20, the claw portion 24 separates from the ratchet tooth 20 against the spring 21. The moved operation piece 29 pushes the locking bent portions 37, 37 into the pins 39, 3.
9, the ratchet pawl 22 is held while the spring 21 is compressed, and the winding shaft 13 is allowed to rotate in the reverse direction.
When returning the ratchet claw 22 to the original position, the operating piece 29 is pushed in, and the locking bent portions 37, 37 and the pin 3
When the holding state of 9 and 39 is released, the ratchet pawl 22 is resiliently returned by the spring 21 and automatically engages the pawl portion 24 with the ratchet teeth 20.

[0024]

According to the present invention, a winch that can be used widely from light loads to heavy loads is provided, but the ratchet teeth 20 are formed in an internal tooth shape along the inner periphery of the shaft insertion hole 18 of the bracket 12a. Since the ratchet pawl 22 is slidably stored in the pawl accommodating chamber 23 of the winding shaft 13 and the ratchet mechanism is arranged within the thickness of the bracket 12a, the conventional ratchet pawl 22 can be used even for heavy loads. It does not cause distortion everywhere as in the case of and can withstand extremely strong. The winding shaft 1 is used for winding and rewinding.
When the ratchet mechanism rotates the bracket 1
Since it is arranged within the thickness of 2a and is not exposed to the outside, there is an effect that there is no danger of foreign matter being pinched.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a winch according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a meshing state of a ratchet mechanism in the winch according to the embodiment.

FIG. 3 is a perspective view showing a state in which the ratchet mechanism of the winch according to the embodiment is disengaged.

4A and 4B show another embodiment of the operation piece and the holding means, in which FIG. 4A is a cross-sectional view showing a meshing state of a ratchet mechanism, and FIG. FIG.

FIG. 5 is a vertical sectional view showing still another embodiment of the operation piece and the holding means.

FIG. 6 shows the structure of the present invention in comparison with a conventional example;
(A) is a cross-sectional view of a winch according to one embodiment of the present invention, and (B) is a cross-sectional view of a winch according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Substrate 12a, 12b Bracket 13 Winding shaft 13e Shaft end 17 Lever engaging part 18 Shaft insertion hole 19 Shaft supporting hole 20 Ratchet tooth 21 Spring 22 Ratchet tooth 23 Nail storage room 24 Nail part 25 Nail shaft part 26 Protective cover 29 Operation Piece 30 holding means

Claims (3)

(57) [Claims] 1. A winch provided with a ratchet mechanism between a take-up shaft suspended on a pair of brackets and the bracket, the ratchet mechanism allowing forward rotation of the take-up shaft but preventing reverse rotation. An internal toothed ratchet tooth formed along the inner circumference of the shaft insertion hole formed in the bracket, and a ratchet tooth that is provided so as to be movable back and forth in the radial direction of the winding shaft so as to mesh with the ratchet tooth by a spring. A winch comprising a squeezed ratchet claw. 2. A claw storage chamber extending radially from the shaft end of the take-up shaft inserted through the shaft insertion hole and extending from the shaft end to the inner periphery of the ratchet teeth, wherein a ratchet is formed in the claw storage chamber. The ratchet pawl is located inside the ratchet teeth and protrudes from the pawl storage chamber toward the ratchet teeth, and the winding shaft is refracted and deflected from the pawl. A claw shaft portion slidably housed in the claw storage chamber positioned near the shaft end of the crawler shaft, and a spring is provided between the protection cover attached to the shaft end of the winding shaft and the claw shaft portion. The winch according to claim 1, characterized in that the winch is interposed. 3. An operation piece for detaching the claw portion of the ratchet claw from the ratchet teeth is extended toward the outside of the protection cover from the ratchet claw, and the operation piece is protected with the ratchet claw detached from the ratchet teeth. 3. The winch according to claim 2, further comprising a holding means for detachably holding the winch.