JP2623060B2 - Towing hoist - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction hoist.

[0002]

2. Description of the Related Art As a conventional traction hoisting device, Japanese Patent Publication No. Sho 63
There was one described in -3837.

That is, this conventional traction hoisting apparatus has a press nut engaging portion only on the disc nut and the idler, and also has a support cylinder (fitted to the shaft so as to be non-rotatable).
On the disk nut, and a locking portion on the disc nut for preventing excessive loosening of the brake.

In addition, a front opening groove which is detachably fitted to the locking projection is provided only in the idle rotation, and one side of the opening groove is used as a locking portion for holding a brake tightening position.
The other groove side surface is used as a stopper for restricting rotation in the brake tightening direction.

In the idle (idling) state, the idler and the disc nut are coupled with each other via the above-described pressing and engaging locking portion which is mutually pressed by the force of the torsion spring for tightening the brake. The locking portion of the disc nut for preventing excessive loosening of the brake is engaged with the locking projection, and this idle state is maintained.

In the non-idling state, the locking portion for holding the brake tightening position only in the idling state is engaged with the locking projection, and this non-idling state is maintained.

[0007]

Therefore, in the conventional traction hoisting apparatus, it is necessary to provide an engaging portion for pressing connection, a locking projection, a locking portion for preventing excessive relaxation of the brake, a front opening groove, and the like.
There are drawbacks that are difficult to manufacture and costly,
Switching operation was also troublesome.

In the present invention, therefore, the overall structure is not so complicated, and the idle (idling) state and the non-idling state can be reliably maintained, which is extremely safe and can be switched to each state. It is an object of the present invention to provide a traction hoist that can be easily performed.

[0009]

In order to achieve the above object, a traction hoist according to the present invention comprises a disk nut screwed to a shaft so as to be able to advance and retreat, and a disk nut relative to the disk nut. The idle rotation that can move in the axial direction
In the traction hoisting device provided with, a torsion spring for applying a rotational force in the brake releasing direction to the disc nut is interposed between the disc nut and the idler, and at the end of the shaft. A press spring for pressing the idler to the disc nut side is interposed between the fixed spring holder and the idler, which is formed inside the idler, and the push spring. Is set to be larger than the axial thrust of the torsion spring.

[0010]

[Operation] If the idler is pulled in the direction away from the disc nut against the elastic force of the spring, the disc nut is free, and the twist spring rotates the disc nut in the brake release direction. Thus, the brake is released. That is, the disk nut is separated from the contact surface of the brake lining.

At this time, if the pulling force of the idler is released, the idler is pressed toward the disk nut by the elastic force of the pressing spring.

However, even if the disc nut is pressed only by idle rotation, it does not rotate around the shaft center with respect to the shaft and does not move in the axial direction. That is, the disc nut is held in a state where it is separated from the contact surface of the brake lining, and the idle (idling) state is held.

Further, since the axial thrust of the pressing spring is larger than the axial thrust of the torsion spring, the braking state (ie,
In the non-idling state), the idler is pressed toward the disc nut by the pressing spring, and the disc nut is kept in contact with the contact surface of the brake lining.

[0014]

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

In FIG. 1, reference numeral 1 denotes a shaft to which a pinion 2 is fixed at one end, 3 denotes a rod sheave, which is rotatably fitted to the shaft 1 and a load sheave 3 is pivotally attached to side plates 5, 5. ing.

A load gear 6 is fixed to the load sheave 3, and the load sheave 3 is always connected to the pinion 2 via a reduction gear group 7.

A reduction gear group 7 and the like are surrounded by a gear box 8 fixed to one side plate 5, and a ratchet cover 9 is fixed to the other side plate 5.

An upper hook 10 is attached to the side plates 5 and 5 so as to be rotatable and swingable, and a load chain 11 is suspended and suspended from the load sheave 3. A load hook 12 is attached to a lower end of the load chain 11, and a load is applied to the load hook 12.

The shaft 1 has a disk hub.
A disc nut 14 is screwed to the threaded portion of the shaft 1 outside the hub 13 so as to be able to advance and retreat.

That is, the disk hub 13 comprises a small cylindrical portion 13a and an outer flange portion 13b. A ratchet wheel 15 and brake linings 16, 16 are interposed between the disk hub 13 and the disk nut 14 so as to be able to pinch. Be mounted.

Specifically, the small cylindrical portion 13 of the disc hub 13
a rotatably fitted with the interlocking ring 17
Serrations, splines, etc. are formed on the outer peripheral surface of the ratchet wheel 15 and the brake linings 16, 16 with serrations, splines, etc. corresponding to the serrations, splines, etc. are formed on the inner surface of the through hole. Relative rotation does not occur on the 16 contact surfaces.

The side plate 5 has a braking claw piece.
The side plate 5 is engaged with the uneven teeth on the outer periphery of the ratchet wheel 15.

The ratchet cover 9 is provided with a lever for manual operation so as to be swingable around the axis L of the shaft 1.
20 is attached.

The lever 20 has a switching piece 22 provided with a forward rotation / reverse rotation claw that is engaged with and disengaged from the switching gear portion 21 of the disk nut 14, and is built in its base end. twenty three
The operation can be switched between forward, reverse and neutral.

A serration 24 is provided at the end of the shaft 1.
The sleeve 25 is fixed to the sleeve 25 through the like, and the idler 26 is attached to the sleeve 25 so as to be axially movable.

Further, a spring receiver 27 is fixed to the end of the shaft 1 (outside the sleeve 25).

The disk nut 14 and idle rotation
26, a twist spring 28 is interposed, and
A spring 29 is interposed between the spring spring 27 and the spring support 27.

That is, one end 28a of the torsion spring 28 is inserted and fixed to the disk nut 14, and the other end 28b is inserted and fixed to the idler 26 to apply a rotational force to the disk nut 14 in the brake releasing direction.

The pressing spring 29 presses the idler 26 in the direction of arrow A.

The idler 26 has an outer tube 30 and an inner tube 31, and the outer tube 30 has a spring receiver 27 formed therein.

In this case, the thrust of the pressing spring 29 in the axial direction is
It is set to be larger than the axial thrust of the twist spring 28.

Therefore, in the state shown in FIG. 1, the rear outer end surface 32 of the disk nut 14 is pressed in the direction of arrow A by the front end surface 33 of the idler 26 only when idle, and this state is maintained.

However, if the idle nut 26 is pushed in the direction of arrow B from the state shown in FIG. 1 and pulled against the elastic force of the spring 29, as shown in FIG. The pressing force of is released, and the state becomes free.

As a result, the disc nut 14 is rotated in the direction of arrow R by the torsion spring 28,
14 moves in the direction of arrow C until the rear inner end surface 34 contacts the end surface 35 of the sleeve 25.

Next, when the pulling force of the idler 26 in the direction of arrow B is released, the idler 26 is pressed in the direction of arrow D by the elastic force of the pressing spring 29, as shown in FIG. The front end face 33 of the idler 26 comes into contact with the end face 32 of the disc nut 14.

In this case, the disc nut 14 is pressed in the direction of the arrow D by the idle rotation 26 only.
Does not rotate with respect to the shaft 1 in the direction opposite to the direction of arrow R (see FIG. 3), and does not move in the direction of arrow D. In other words, the front end surface 36 of the disc nut 14 is kept separated from the contact surface of the brake lining 16. That is, the idling (idling) state is maintained.

In the state shown in FIG. 4, when the shaft 1 is rotated under a sudden load, the disk nut 14 is stopped by inertia, and the disk nut 14 is moved in the direction of arrow D by the rotation of the shaft 1. And the disk nut 14
Is brought into contact with the contact surface of the brake lining 16, and a braking state (non-idling state) is established.

When the handle 23 is operated by setting the lever 23 to the winding state from the state shown in FIG.
Rotates, and the disk nut 14 moves in the direction of arrow D, and the state shown in FIG. 1 (braking state) is achieved.

When a load is applied to the chain 11 in the braking state, even if the idler 26 is pulled in the direction of arrow B as shown in FIG. The nut 14 does not rotate around its axis, and the front end face 36 of the disc nut 14 does not enter the brake release state in which the front end face 36 is separated from the contact surface of the brake lining 16, which is safe.

Since the axial thrust of the pressing spring 29 is set to be larger than the axial thrust of the torsion spring 28,
In the state shown in FIG. 1, the disc nut 14 is pressed by the idler 26 and its front end face 36 is
1 can be kept in contact with the contact surface 16 even with a light load, and the load suspended from the load hook 12 does not drop.

[0041]

Since the present invention is configured as described above, the following effects can be obtained.

When a load is applied to the load chain 11 in the braking state, even if the idler 26 is pulled in the idle rotation direction, the load is not released and the brake is completely released.

In the idling state, even if the shaft 1 suddenly rotates due to a sudden load, the disk nut 14 is stopped by inertia, and the rotation of the shaft 1 causes the disk nut 14 to rotate.
14 moves to the brake lining side and enters the braking state,
It is safe.

In the braking state, the resilient force of the push spring 29 can reliably maintain the braking state, and even a light load does not cause a load or the like suspended on the load hook 12 to fall.

It is possible to reliably maintain the idling state and the non-idling state without providing the engaging projections on the disc nut 14 and the idler 26 and the like, and the switching operation is simple and the overall structure is complicated. There is an advantage that does not become.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part for describing an operation.

FIG. 3 is a cross-sectional view of a main part in a state during switching to idling.

FIG. 4 is a sectional view of a main part in an idling state.

[Explanation of symbols]

 1 Shaft 14 Disc nut 26 Idle ball 27 Spring receiver 28 Twist spring 29 Push spring

Claims (1)

(57) [Claims] 1. A traction hoist comprising: a disk nut 14 screwed to a shaft 1 so as to be able to advance and retreat; and an idler 26 that is axially movable relative to the disk nut 14. At this time, a torsion spring 28 for applying a rotational force in the brake releasing direction to the disc nut 14 is interposed between the disc nut 14 and the idler 26, and is fixed to an end of the shaft 1. Between the spring receiver 27 formed inside the idler gripper 26 and the idler gripper 26, a pressing spring for pressing the idler gripper 26 toward the disc nut 14 side.
29. A traction hoisting device, wherein a thrust in the axial direction of the pressing spring 29 is set to be larger than an axial thrust of the torsion spring 28.