JPH0155199B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a traction hoisting device.

Conventional traction hoisting devices are equipped with an idler mechanism that disengages the pinion and intermediate driven gear when no load is applied so that the chain can be quickly adjusted to a predetermined length. Swing the operating handle of the traction hoisting device to hoist it up.
If the free rotation mechanism was operated incorrectly during rewinding, the load sheave would be able to rotate freely and there was a risk that the suspended object would fall. Furthermore, depending on the situation at the work site, a falling rock may unexpectedly hit the switching lever of the operating handle, causing it to return to the neutral position while the worker is operating the handle with force. There have also been accidents where people have been caught off guard and hit their knees, resulting in injuries.

An object of the present invention is to provide a towing and hoisting device having a safety mechanism that prevents the occurrence of such dangerous accidents.

Hereinafter, the present invention will be explained in detail based on the illustrated embodiments.

In FIGS. 1 and 2, 1 is an operating handle, 2 is a housing, and 4 is a drive shaft to which the base of the handle 1 is attached. A chain 36 is suspended from a load sheave in the housing 2, and the lower end A hook is attached to the. A switching lever 26 is attached in a protruding manner near the base of the handle 1, and a safety lever 37 is attached in a protruding manner near the switching lever 26. Specifically, in FIG. 1, the switching lever 26 is in the winding U position and when the handle 1 is swung, the chain 36 is wound up, and in FIG. The chain 36 is then rewound.

In FIG. 3, 3 is a load sheave, on which the chain 36 is suspended, and the load sheave 3 is rotationally driven via the drive shaft 4 and gear mechanism 11 by the swinging movement of the handle 1. . More specifically, the swinging motion of the handle 1 is controlled by the ratchet mechanism 5.
The rotational movement of the driving wheel 6 is transmitted and converted through the rotational movement of the driving wheel 6.
The driving wheel 6 is screwed to a driven wheel 7, and the driving wheel 6
As it rotates, it moves relative to the driven wheel 7 in its axial direction. At the hoisting U position, the driving wheel 6 rotates in the left direction A and is connected to the driven wheel 7 through the brake linings 8, 8 and the ratchet wheel 9, thereby transmitting the rotational force to the driven wheel 7.
Further, at the rewinding position D, the driving wheel 6 does not rotate in the right direction B, but the driven wheel 7 also rotates following the driving wheel 6 due to the unwinding load applied to the load sheave 3. The driven wheel 7 is slidably spline-fitted to the drive shaft 4, and the driven wheel 7 and the drive shaft 4
and can be moved relative to each other in the axial direction, and rotate integrally.

A pinion 10 is fixed to the tip of the drive shaft 4, and the pinion 10 is interlocked and connected to a gear mechanism 11 connected to the load sheave 3 (not shown) so as to be able to engage and disengage. When the pinion 10 and the gear mechanism 11 are in mesh, the rotational movement of the drive shaft 4 is transmitted to the load sheave 3 via the gear mechanism 11, and the load sheave 3 drives the winding U or the unwinding D. becomes possible. Further, when the pinion 10 and the gear mechanism 11 are in a disengaged state, the rotational movement of the drive shaft 4 is not transmitted to the load sheave 3, and the load sheave 3 is in an idle state. That is, the drive shaft 4 and the pinion 10 are freely movable in the axial direction as a unit, and when they move in the direction of arrow B, the pinion 1
0 is disengaged from the gear mechanism 11, and the load sheave 3 is in a separated state, and the spring 3
8 resiliently urges the pinion 10 and the drive shaft 4 in the direction of arrow A, that is, in the direction of meshing.

As shown in FIGS. 3, 4, and 5, the ratchet mechanism 5 includes a gear 17, a pair of left and right pawls 18,
Consists of 19. The gear 17 is loosely fitted into the driven wheel 7, and is fixed to the driving wheel 6 by a plurality of bolts 16. Further, the claw pieces 18 and 19 are swingably arranged opposite to the handle 1 via claw support shafts 20 and 21, and the left claw piece 18 is attached to the gear 1 during winding U.
The right claw piece 19 is for winding and engages with the gear 17 as shown by the phantom line in FIG. 5 during rewinding D, and is for rewinding.

Both pawl pieces 18 and 19 are always elastically biased in a direction away from the gear 17 by elastic members 22 and 23, respectively. The engagement and disengagement between the claw pieces 18 and 19 and the gear 17 is controlled by a cam 24 fixed to a camshaft 25 that is completely separate from the claw support shafts 20 and 21.

That is, as shown in FIG. 4, when the cam 24 is in the neutral N position, both the claw pieces 18 and 19 are in a detached state due to the elastic force of the elastic members 22 and 23.
Even if the handle 1 is swung, the gear 17 does not rotate in either the winding direction F or the unwinding direction G.

Further, as shown by the solid line in FIG. 5, when the cam 24 is in the winding U position, the winding claw piece 18 is
4, the rewinding claw piece 19 is in an engaged state against the resilient force of the resilient member 22, while the rewinding claw piece 19 is in a disengaged state due to the resilient force of the resilient member 23. When the handle 1 is rocked, only the rocking force of the handle 1 in the hoisting direction F is transmitted to the gear 17 via the hoisting pawl 18, so that the gear 17 and the drive wheel 6 are The load sheave 3 rotates in the hoisting direction F, thereby driving the load sheave 3 to hoist in the manner described above.

On the other hand, as shown by the imaginary line in FIG. 5, when the cam 24 is in the rewinding position D, the winding claw piece 18 is in the detached state due to the elastic force of the elastic member 22, and the winding claw piece 19 is in the detached state. is forcibly engaged by the cam 24. Therefore, when the handle 1 is rocked, only the rocking force of the handle 1 in the rewinding direction G is transmitted to the gear 17 via the rewinding claw piece 19, so that the load sheave 3 rotates in the opposite direction.

Thus, the camshaft 25 protrudes to the outside of the handle 1, and the switching lever 2 is attached to the protrusion of the camshaft 25.
6 is fixedly installed, and by switching the switching lever 26 to the positions shown in FIG. 1, FIG. The winding, rewinding, and neutral positions are controlled. Note that 27 is a positioning mechanism for the cam 24, and the mechanism 27 is composed of a protrusion 28 and a resilient member 29.

Reference numeral 13 denotes a pawl piece pivotally attached to the housing 2 so as to be able to swing freely. It prevents rotation in the lowering direction and prevents the driven wheel 7 and by extension the load sheave 3 from reversing during hoisting, and the rotational force of the driven wheel 7 acts directly on the drive wheel 6 during unwinding. to prevent

12 is an idling mechanism for operating the load sheave 3 into an idling state, and the idling mechanism 12 includes a cam member 14 fixed to the rear end of the driven wheel 7 and a drive shaft 4.
It consists of an operating wheel 15 that is rotatably fitted onto the rear end portion and engages with the cam surface of the cam member 14.

When the operating wheel 15 is rotated in one direction from the meshed state of the pinion 10 and the gear mechanism 11, the operating wheel 15 is rotated in the rightward direction B as shown by the imaginary line in FIG. 3 due to the action of the cam surface of the cam member 14. As a result, the drive shaft 4 and pinion 10 move in the right direction B, and the pinion 10 becomes detached from the gear mechanism 11. Thus, the load sheave 3 enters an idling state with respect to the drive shaft 4. In addition, the operating wheel 15
When the pinion 10 is operated in the opposite direction to the above, the action of the spring 38 causes the pinion 10 to move to the left direction A.
and the gear mechanism 11 are brought into mesh again, and the idle rotation state of the load sheave 3 is released. In other words, the load sheave 3 and the drive shaft 4 are interlocked and connected.

As shown in FIGS. 6 to 9, a locking portion 30 is indirectly provided on the drive shaft 4.
In the example shown, the drive shaft 4 is
An outer flange portion 31 is formed on the operating wheel 15 attached to the locking portion 30 with the outer surface of the outer flange portion 31.
shall be. Then, the safety lever 37
0, and is protrudingly provided on the handle 1 near the outer flange 31 and close to the switching lever 26. That is, a safety lever shaft 32 is fixedly provided in a protruding manner from the handle 1, and a safety lever 37 is pivotably pivoted to this shaft 32 with a resilient member 33 interposed therebetween, and is prevented from coming off with a nut 34 or the like. .

To explain in more detail, this safety lever 37
As shown in FIG.
The operation wheel 15 and the drive shaft 4 are prevented from moving in the right direction B, corresponding to the outer surface of the control wheel 15 and the drive shaft 4. In addition, the safety lever 37 has a flat plate-like regulating portion 39 , and the regulating portion 39
corresponds parallel to the outer surface of the handle 1, and is formed on the side corresponding to the curved convex portion 44 and the switching lever 26. Further, a finger contact portion 40 is provided in an upright manner at right angles to the flat plate-like restriction portion 39 so that a person can easily operate it with a finger.

On the other hand, the switching lever 26 has left and right side edges formed of concave curved parts 41, 41, and a flat plate-shaped regulating part 42 parallel to the outer surface of the handle 1, and a knob part 43 protruding from the plate-like part 43 (to be pinched by a person's fingers). Furthermore, as is clear from Fig. 7, the safety lever 3
The flat regulating portion 39 of the switching lever 26 and the flat regulating portion 42 of the switching lever 26 are disposed on substantially the same plane.
They are designed to come into contact with each other when swinging to restrict their movements.

That is, only when the switching lever 26 is in the neutral N position, the safety lever 37 swings from the imaginary line in FIG.
The shapes of both flat plate-like regulating portions 39 and 42 are determined so that they can be disengaged from each other. In other words, the shape is determined so that the curved convex portion 44 of the safety lever 37 can swing without colliding with the substantially arc-shaped concave curved portion 41 of the switching lever 26 at the neutral N position. As a result of this rocking, the locking piece 35 of the safety lever 37 is completely locked into the operating wheel 1.
The operating wheel 15 is released from the outer surface of the locking portion 30 of No. 5 and is freely movable in the axial direction. On the other hand, when the switching lever 26 is switched to the winding U position as shown in FIG. However, even if the safety lever 37 is pushed in the direction of arrow P with a finger, it only swings slightly as shown by the imaginary line in the figure, and the engaged state between the locking piece 35 and the locking part 30 is not maintained. Ru. Furthermore, when the switching lever 26 is switched to the rewind D position as shown in FIG. 9, the curved convex portion 44 of the safety lever 37
A minute gap K is formed in the protrusion 46 near the tip of the regulating portion 42 of No. 6.
Even if the safety lever 37 is pushed in the direction of the arrow P with a finger, the locking piece 35 will still correspond to the outer surface of the locking part 30 and the engaged state will be maintained even if the safety lever 37 is only swung to the imaginary line in the figure. Ru.

As shown in FIG. 10, only when the switching lever 26 is in the neutral N position, move the safety lever 37 with your finger to the arrow P.
The operating wheel 15 can be pulled out in the direction of arrow B while being pressed in the direction of arrow B. The resilient member 33 is always resiliently biased in the direction in which the locking piece 35 of the safety lever 37 locks with the locking portion 30 of the operating wheel 15.
As shown in the figure, the axial width M of the outer flange portion 31 is set to be larger than the amount of movement of the drive shaft 4 and the operating wheel 15 in the directions of arrows A and B, so that state), the locking piece 35 of the safety lever 37
However, it rides on the outer flange 31 of the operating wheel 15 having a large width M and maintains a swinging posture close to the solid line in FIG. It is prevented from swinging from the winding position to the winding U position and to the rewinding D position. That is, when the locking piece 35 comes into contact with and rides on a protrusion 47 attached to the drive shaft 4, such as the outer peripheral surface of the outer flange 31, in an idle rotation state, the switching lever 26
By making it impossible to switch to the winding U position or the unwinding D position, it is possible to effectively prevent gear breakage accidents caused by large rotational torque acting when the pinion 10 and gear mechanism 11 are in a half-engaged state. are doing.

In the illustrated embodiment, the locking portion 30 is provided on the operating wheel 15, but it is also preferable to attach another member to the drive shaft 4 and form the locking portion 30 thereon. It is also possible to form the locking portion 30 directly on the shaft 4 itself. Further, the shapes of the safety lever 37 and the switching lever 26 are freely deformable, and can be completely freely determined by reversing the concave and convex portions if the shape mutually restricts rocking as described above. Also, the switching lever 26 is connected to the pawl support shafts 20, 2.
1, or the claw pieces 18, 19 and the claw support shaft 20,
You are free to use the singular number for each of 21. It is also preferable to provide the protrusion 47 directly on the drive shaft 4 or on a component other than the operating wheel 15.

As described in detail above, the present invention includes a switching lever 26 protruding from the operating handle 1 for switching between the winding U, rewinding D, and neutral N positions, and further includes:
A locking portion 30 is provided directly or indirectly on the drive shaft 4, and a safety lever 37 that can be freely engaged and detached from the locking portion 30 is provided protruding from the handle 1, and the width of the operating handle 1 when viewed from the front is The switching lever 26 and the safety lever 37 are arranged in close proximity to each other at the center and end positions of the direction positions, respectively, and the locking portion 30 of the safety lever 37 is closed only when the switching lever 26 is in the neutral N position. The switching lever 26 and the safety lever 37 are constructed in a shape that allows them to come into contact with and separate from each other, and the resilient member 33
The safety lever 37 is elastically biased in the direction of locking with the locking portion 30, and the drive shaft 4 is moved in the axial direction and pulled out in the direction of disengaging the pinion 10 for driving the load sheave 3. For example, the safety lever 37 is configured to come into contact with a protrusion 47 attached to the drive shaft 4 to prevent the switching lever 26 from swinging from the neutral N position to the winding U or rewinding D position. Since it is a hoisting device, it can effectively achieve its intended purpose, and in particular, unless the safety lever 37 is consciously swung with a finger, the pinion 10 of the drive shaft 4 cannot be disengaged and put into an idle state. Prevents the accident of the lifted object falling unexpectedly.
Moreover, since the safety lever 37 cannot be disengaged from the locking portion 30 in the winding U and unwinding positions D, safety can be further improved. Moreover, when the pinion 10 is pulled out in the axial direction and the pinion 10 is in a half-engaged state, the switching lever 26 cannot be switched to the winding U or rewinding D position, so the surface pressure of the pinion 10 on the gear mechanism 11 is reduced. Accidents of extreme damage and breakage can be prevented to a limited extent. moreover,
Depending on the situation at the work site, falling rocks, etc. may cause the switching lever 26 to
or the switching lever 26 may unexpectedly collide with a protruding object while swinging the handle 1 in a narrow space and return from the hoisting U position to the neutral N position. For example,
Since the worker is swinging the handle 1 with all his might, there is a risk of him getting caught unexpectedly and falling from a height, or being injured by hitting his knee with the handle 1. However, the safety lever 37 prevents the switching lever 26 from colliding with a falling rock or the like, or prevents a protruding object from colliding with the switching lever 26, and has the great effect of effectively preventing the above-mentioned serious accident.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of the present invention in a rolled up state, Fig. 2 is a front view of an unwound state, Fig. 3 is an enlarged side view partially cut away, and Fig. 4 is a main view of the neutral position. 5 is a front view of the same in the winding or unwinding position, FIG. 6 is a cross-sectional side view of the main part, FIG. 7 is a simplified explanatory diagram explaining the positional relationship between the safety lever and the switching lever, and FIG. Figure 8 is a front view of the main parts in the rolled up state.
FIG. 9 is a front view of the main part in the rewound state, and FIG. 10 is a front view of the main part in the neutral state. U... Winding up, D... Rewinding (lowering), N...
...neutral, 1...handle, 3...road sheave,
4... Drive shaft, 10... Pinion, 26... Switching lever, 30... Locking part, 33... Resilient member, 3
7...Safety lever, 47...Protrusion.

Claims (1)

[Claims] 1 The operating handle 1 has a switching lever 26 for switching between winding U, rewinding D, and neutral N positions.
Furthermore, a locking portion 30 is provided directly or indirectly on the drive shaft 4, and a safety lever 37 that can be freely engaged and detached from the locking portion 30 is provided on the handle 1 and protrudes from the handle 1. The switching lever 26 is located at the center position and at the end position in the width direction of the operating handle 1.
and the safety lever 37 are arranged in close proximity and in parallel, and the switching lever 26 is swingable in the direction in which the safety lever 37 disengages from the locking portion 30 only in the neutral N position, so that the switching The lever 26 and the safety lever 37 are constructed in a shape that allows them to come into contact with and separate from each other, and the resilient member 33 biases the safety lever 37 in a direction in which the safety lever 37 is engaged with the locking portion 30.
When the drive shaft 4 is moved in its axial direction and pulled out in the direction to disengage the pinion 10 for driving the load sheave 3, the safety lever 37 comes into contact with the protrusion 47 attached to the drive shaft 4, and the switching lever 26 from the neutral N position to the hoisting U or rewinding D position.