JPH06191795A - Lever type hoist traction device - Google Patents

Abstract

PURPOSE:To concurrently provide both an idling function where idle operation can be performed and an overload preventing function where transmitting torque to a load sheave from an operating lever can be set at normal use time and further in the case of applying a load exceeding the preset transmitting torque, hoist and traction any more can be disabled. CONSTITUTION:In a lever type hoist traction device provided with a mechanical brake, a feed handle 13 is provided in a drive shaft 5, and an idling unit is provided between this feed handle 13 and a drive member 8. The drive member 8 is constituted of a brake retainer 81 and a rotary member 82 screwed to the drive shaft 5, to rotatably support this rotary member 82 to a sleeve 81a of the brake retainer 81 to also screw a transmitting torque set adjusting member 86, and between this adjusting meber 86 and a flange 81b of the brake retainer 81, the rotary member 82, friction plate 83, retainer and an elastic member 84 are interposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a lever type hoisting and pulling device,
Specifically, during idle operation, the mechanical brake can be held loose and the chain hanging on the load sheave can be pulled out and pulled back quickly, and from the operating lever during normal use. The present invention relates to a lever-type hoisting and traction device that can set a transmission torque to a load sheave and can disable further hoisting and towing operations when a load exceeding the set transmission torque acts.

[0002]

2. Description of the Related Art Conventionally, a lever type hoisting and pulling device provided with an idling device is disclosed in, for example, JP-A-58-15769.
No. 7 publication.

[0003]

In this conventional device, however, the chain that is hung on the load sheave is quickly pulled out and pulled back by holding the mechanical brake in a loosened state by operating the feed handle. The so-called idling operation can be performed, but during normal use, even if an overload exceeding the rated load is applied, the hoisting / pulling operation can be performed by the operation lever. For this reason, not only cannot the transmission torque from the operating lever be set to the load sheave, but even if an overload is applied, it is not possible to prevent overload that would prevent further hoisting / pulling operations, resulting in damage to the device. There is a problem that occurs.

An object of the present invention is to allow a load sheave to rotate freely, and to set a transmission torque to the load sheave. When a load exceeding the set transmission torque is applied, further winding is performed. It is a point to provide a lever-type hoisting and pulling device having both functions of an overload preventing function capable of disabling the up / down operation.

[0005]

In order to achieve the above object, the present invention rotatably supports a load sheave 3 and a drive shaft 5 for driving the load sheave 3 between the side plates 1 and 2. The driven member 7 is coupled to the drive shaft 5, and the drive member 8 driven and rotated by the operating lever 15 via the claw 14 is screwed into the driven member 7 to form a brake plate between the driven member 7 and the drive member 8. 9, 9 and a brake pawl wheel 11 are provided, and a reverse rotation preventing pawl 12 that meshes with the pawl wheel 11 is provided on the side plate 2.
Is provided to form a mechanical brake, and a feed handle 13 is connected to the outer end of the drive shaft 5, and the mechanical brake is connected between the feed handle 13 and the drive member 8. While providing a loosening device for controlling loosening and tightening, the drive member 8 is provided with a brake retainer 81 having a sleeve 81a and a flange 81b, and a tooth portion 8a which meshes with the claw body 14 of the operation lever 15. And a transmission torque setting adjusting member 86 is screwed into the sleeve 81a, and the transmission torque setting adjusting member 86 is screwed between the adjusting member 86 and the flange 81b. The rotating member 82, the friction plate 83,
The pressing plate 87 is interposed, and the elastic member 84 is interposed between the pressing plate 87 and the adjusting member 86.

[0006]

The mechanical brake can be loosened by operating the feed handle 13 of the idling device to rotate the drive shaft 5. In this state, the load sheave 3 is in an idling state. A chain hanging on the load sheave 3 can be pulled out and pulled back quickly. Moreover, during normal use, the transmission torque transmitted from the operating lever 15 to the load sheave 3 can be set by adjusting the transmission torque setting adjustment member 86, and the adjustment can be performed on the chain hanging on the load sheave 3. When a load exceeding the transmission torque set by the member 86 is applied, a slip occurs between the rotating member 82 and the brake pressing body 81, and further hoisting and pulling operation can be disabled.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The lever-type hoisting and pulling device shown in the figures is a pair of first
Also, the second side plates 1 and 2 are provided to face each other at a predetermined interval, the hook 10 is provided between the side plates 1 and 2, and the cylindrical shaft 4 having the load sheave 3 is rotatably supported. A drive shaft 5 is rotatably supported in a central hole of the drive shaft 5, and a reduction gear mechanism 6 including first to fourth gears is provided between the protruding end of the drive shaft 5 on one side plate 1 side and the load sheave 3. By interposing, the rotational power of the drive shaft 5 is transferred to the load sheave 3
It is configured to be decelerated and transmitted. In addition, a flange portion 7a is provided on the outer periphery of the projecting end portion of the drive shaft 5 on the other side plate 2 side.
A driven member 7 composed of a hub barrel having a hub is joined, a drive member 8 described later is screwed to the outside of the driven member 7, and a brake plate is provided between the driven member 7 and the drive member 8. 9, 9 and a brake pawl wheel 11 are provided, and a reverse brake 12 for engaging the pawl wheel 11 and fixing the pawl wheel 11 is provided on the second side plate 2 to form a mechanical brake. On the other hand, a tooth portion 8a of a rotating member 82, which will be described later, is provided on the outer periphery of the driving member 8.
An operating lever 15 having a claw 14 that meshes with is provided, and a feed handle 13 is supported on the outside of the drive member 8 by serration fitting. By operating the feed handle 13, the mechanical brake is removed. The load sheave 3 is loosened so that the load sheave 3 can be idled.

In the embodiment shown in the drawings, the drive member 8 is
A blade having a sleeve 81a and a flange 81b.
The pressing member 81 and the rotating member 82 having the tooth portion 8a that meshes with the claw member 14 of the operating lever 15 are provided to rotatably support the rotating member 82 on the outer periphery of the sleeve 81a. Rotating member 82 and the brake pressing body 81
Between the pin and the spring, the brake retainer 81 rotates integrally with the rotating member 82 when the brake retainer 81 is rotated in the lowering or pulling direction, and is freely rotatable during the winding or pulling direction. The transmission torque setting adjusting member 86 is screwed into the sleeve 81a while the unidirectional rotating mechanism 30 is interposed, and between the adjusting member 86 and the flange 81b,
The rotation member 82, the friction plate 83, and the holding plate 87 are interposed, and between the holding plate 87 and the adjusting member 86, an elastic member 84 made of a disc spring and a non-rotatable blocking plate having a locking hole 8b. 85, the transmission torque transmitted from the operation lever 15 to the load sheave 3 can be set by the adjustment member 86, and the adjustment member 8 is attached to the load sheave 3.
When a load that exceeds the transmission torque set in 6 is applied,
The frictional connection between the rotating member 82 and the brake pressing body 81 is slipped so that further winding and pulling operation can be disabled.

A break cover 18 for covering the mechanical brake is attached to the side plate 2, and an opening 18a provided on one side of the break cover 18, that is,
The lever 15 is rotatably supported in the opening 18a that receives the flange 81b of the brake retainer 81 and is fixed so as not to move in the axial direction of the drive shaft 5. The outer surfaces of the rotating member 82 on the tooth side are opposed to each other so that the rotating member 82, and thus the drive member 8 is regulated so as not to move axially outward by a predetermined amount or more.

In the embodiment shown in the drawings, the structure for preventing the lever 15 from moving in the axial direction is such that a cylindrical portion 18b is provided in the opening 18a of the break cover 18 and the inside of the lever 15 is provided with the cylindrical portion 18b. Blu-ray cover-18
A cylindrical portion 15a to be inserted into the cylindrical portion 18b is provided, and the ring 19 is fitted into the concave groove formed in the facing surface portion of these cylindrical portions 18b and 15a.

Further, the feed handle 13 is provided with a locking pin 20 which can be selectively engaged with or disengaged from the locking hole 8b of the blocking plate 85, and the pin 20 is engaged with the locking pin 20 during idling operation. The idle state can be maintained by engaging with the stop hole 8b.

As shown in FIG. 2, the locking pin 20 includes a pin body 21 that engages with the locking hole 8b, and the pin body 21.
A knob 22 that is swingably connected to the pin body 21 and that engages or disengages the pin body 21, and a tubular shape that is attached to the feed handle 13 and that movably supports the pin body 21 between an engaging position and a disengaging position. The body 23, the tip flange portion 21 a of the pin body 21 and the tubular body 23 are interposed between the body 23 and the pin body 1.
2 is constituted by an ammunition machine 24 for urging in the direction of the blocking plate 85, which can be disengaged from the locking hole 8b by pulling the knob 22, and the knob 22 can be rocked to fall down. By doing so, the detached position can be maintained,
By raising the knob 22 as shown in FIG. 2, it can be engaged with the locking hole 8b by the urging of the bullet 24.

In FIG. 1, reference numeral 51 is a concave groove provided in the drive shaft 5, 52 is a key groove, and the concave groove 5
1, a pair of half support rings 53, 53 are fitted to support the driven member 7, and a fixed key 54 is fitted to the key groove 52 to fix the driven member 7 to the drive shaft 5. is doing.

Next, the operation of the embodiment described above will be described. First, in order to perform hoisting or towing by a chain (not shown) suspended on the load sheave 3, the lever 1
5, the reciprocating operation of the lever 15 is performed with the forward rotation claw of the claw body 14 engaged with the rotating member 82. The reciprocating motion of the lever 15 causes the rotating member 82 to move.
The forward rotation of the brake pressing body 81 transmits the driving force from the operating lever 15 through the friction connecting portion, and the braking pressing body 81 is screwed forward, and the thrust causes the mechanical braking. Is operated by being tightened, and the driving force is transmitted from the drive shaft 5 to the speed reduction mechanism 6 via the mechanical brake.
It is transmitted to the load sheave 3 via the cylinder shaft 4, and by driving the load sheave 3, it is possible to load or pull a load hooked on a hook fixed to one end of the load chain.

In addition, when the load is unloaded or the towing is released, the rotating member 82 is operated in the reverse direction.
The mechanical brake is loosened by this reverse operation, and the drive shaft 5 is reversely rotated by the reverse rotation amount of the rotating member 82 by the gravity or pulling reaction force of the load suspended in the load chain to gradually unload the load. Alternatively, the towing can be released.

When the load chain is pulled out to a predetermined length at the beginning of work, the pin 2 of the locking pin 20 is pulled out.
2 is pulled to disengage the tip of the pin body 21 from the locking hole 8b of the blocking plate 85, and the reversing claw of the claw body 14 of the lever 15 is meshed with the tooth portion 8a of the rotating member 82. The feed handle 13 is rotated clockwise, or the load chain is pulled to rotate the drive shaft 5 clockwise.

Then, the drive member 8 composed of the brake pressing body 81 and the rotating member 82 has the locking pin 20.
The rotation of the drive shaft 5 and the drive member 8 is relatively moved in the axial direction, and the flange of the driven member 7 is prevented. 7a, the brake plate 9, the flange 81b of the brake retainer 81 and the brake plate 9, and the brake ratchet 1
1 and the break plate 9 cause a clearance to loosen the mechanical break, and at this time, the pin body 21 and the locking hole 8b are rotated by the rotation of the handle 13 at a predetermined angle. Is coincident with each other, the handle 13 and the drive member 8 are automatically locked, and the lock maintains the gap.

That is, the interlocking relationship between the driven member 7 and the drive member 8 with respect to the brake pawl wheel 11 is released by the clearance, and the mechanical brake can be maintained in a loose state, and the load sheave 3 is decelerated. The mechanism 6, the drive shaft 5, the driven member 7, the drive member 8, and the feed handle 13 can be freely rotated together.

In addition, when the above-mentioned idle state is loaded and returned to the unloadable state, the pin body 2 is used.
1 is pulled out from the locking hole 8b and the forward rotation claw of the claw body 14 is meshed with the tooth portion 8a of the rotating member 82, the handle 13 is rotated counterclockwise or the load chain is pulled to drive the drive shaft 5 By rotating the brake counterclockwise to the left, the brake pressing body 81 can be screwed to return to the operating state of the mechanical brake, and in this state, loading and unloading can be performed as usual.

Further, when the load is pulled or towed during this normal use, when a load exceeding the set transmission torque is applied to the load chain hanging on the load sheave 3 by the adjusting member 86, the rotation of the load sheave 3 is prevented. Slip occurs between the member 82 and the brake pressing body 81, and it is possible to prevent further hoisting and pulling.

[0021]

Since the present invention is constructed as described above, a so-called idling operation in which the mechanical brake is loosened by the idling device to quickly pull out and pull back the chain hanging on the load sheave 3 In addition to the above, the transmission torque adjusting member 86 can be used to set the transmission torque from the operation lever 15 to the load sheave 3 during normal use, and when a load exceeding the set transmission torque is applied, As a result, a slip occurs between the rotary member 82 and the brake retainer 81 that constitute the drive member 8, and further hoisting / pulling operations can be prevented.

Therefore, according to the present invention, the idling function capable of idling operation and the transmission torque can be set, and further hoisting / pulling operations cannot be performed when a load exceeding the set transmission torque is applied. It is possible to provide both functions of the overload prevention function.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view of a locking pin.

[Explanation of symbols]

1, 2 side plates 3 load sheave 5 drive shaft 7 driven member 8 drive member 9 blur
Key plate 11 Brake claw wheel 12 Reverse rotation prevention claw 13 Feed handle 14 Claw body 15 Reverse rotation prevention claw 81 Bray
Presser 81a Sleeve 81b Flange 82 Rotating member 83 Friction plate 84 Elastic member 86 Transmission torque setting adjusting member 87 Presser plate

Claims (1)

[Claims] 1. A load sheave (3) and a drive shaft (5) for driving the load sheave (3) are rotatably supported between the side plates (1) and (2), and the drive shaft (5) is supported by the drive shaft (5). A drive member (8) which is coupled with the driven member (7) and is driven and rotated by the operating lever (15) via the claw body (14).
By screwing, and the brake plates (9) and (9) and the brake ratchet wheel (11) between the driven member (7) and the driving member (8).
And a reverse rotation preventing pawl (12) that meshes with the ratchet wheel (11) is provided on the side plate (2) to form a mechanical brake, and at the outer end of the drive shaft (5). The drive handle (13) is coupled to provide an idler device between the drive handle (13) and the drive member (8) for controlling loosening and tightening of the mechanical brake. (8) A tooth portion (8) that meshes with a brake presser body (81) having a sleeve (81a) and a flange (81b) and a claw body (14) of the operation lever (15).
a) and a rotary member (82) having a), the rotary member (82) is rotatably supported on the sleeve (81a), and a transmission torque setting adjusting member (86) is screwed to adjust the adjustment. Member (86) and the flange (81b)
Between the rotating member (82) and the friction plate (83)
And a pressing plate (87), and an elastic member (84) is interposed between the pressing plate (87) and the adjusting member (86). Traction device.