JP2003034492A - Chain hoist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain hoist capable of reducing the size, weight, and a cost. SOLUTION: This chain hoist has a pinion gear 2a arranged on one end of a driving shaft 2, a load sheave 12 driven via a load gear 11 interlocking with the pinion gear, and a pair of load side/non-load side guide rollers 3a and 3b for guiding a chain 13 wound on the load sheave 12, and has the non- load side guide roller 3a on the same axis of the driving shaft 2, and is characterized by circumscribing the guide roller 3a to the chain wound on the load sheave.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain hoisting machine, and more particularly to a chain hoisting machine capable of reducing the size and weight of a hoisting machine body and reducing the number of parts and the number of working / assembling steps.

[0002]

2. Description of the Related Art Conventionally, in a chain hoisting machine equipped with load side and non-load side guide rollers for guiding a chain wound around a load sheave, each guide roller is different from the other as shown in FIG. It was mounted on the frame independently of the parts.

A conventional example of a chain hoist having a guide roller circumscribing the chain will be described below with reference to FIG. In the figure, 20 is a load sheave, 21 is a pinion gear that meshes with a load gear (not shown), 22
Reference numeral a denotes a load side guide roller which is circumscribed to the chain and guides a load side chain such as a load from the outside, 22b is a non-load side guide roller, 23 is a frame, and 24 is a chain.

The pinion gear 21 is fixed to a drive shaft (not shown), and is driven by a known drive means such as a drive member, a brake plate, a brake receiver and a multiple thread screw. When the pinion gear 21 is driven, the load sheave 20 rotates via a load gear (not shown) meshing with the pinion gear 21, and the chain 24 is wound up. During the winding operation of the chain 24 by the load sheave 20, the chain 24 is guided by a pair of load-side and non-load-side guide rollers 22a and 22b in order to prevent the chain 24 from being separated from the load sheave 20.

[0005]

In the above-mentioned conventional example, the guide rollers are individually mounted on the frame as individual components, which is an obstacle to downsizing of the hoisting machine body and is heavy. However, there is a problem that the cost becomes higher.

On the other hand, in this type of hoisting machine, it is required to be small in size and light in weight because of its easy handling, and it is also a big subject to reduce the cost. The present invention solves these problems, and an object of the present invention is to provide a chain hoisting machine that can be reduced in size, weight, and cost.

[0007]

According to the present invention, a pinion gear provided at one end of a drive shaft, a load sheave driven via a load gear interlocking with the pinion gear, and a chain wound around the load sheave are guided. A chain hoisting machine provided with a guide roller is characterized in that the guide roller is provided coaxially with the drive shaft, and the guide roller is circumscribed on a chain wound around a load sheave.

According to the present invention, since the guide roller is provided coaxially with the drive shaft, the number of parts can be reduced as compared with the conventional chain hoist in which the guide roller is mounted on the frame as a single part. It is possible to reduce the size and weight of the hoisting machine body, reduce the number of assembly steps, and provide a low-cost hoisting machine.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a pinion gear provided at one end of a drive shaft, a load sheave driven via a load gear interlocking with the pinion gear, and a winding on the load sheave. In a chain hoisting machine equipped with a guide roller for guiding the chain, a guide roller is provided coaxially with the drive shaft, and the guide roller is circumscribed on the chain wound around the load sheave. Since the no-load side guide roller is provided coaxially with the drive shaft, the number of parts can be reduced compared to the conventional chain hoist in which the guide roller is mounted on the frame as a single part. It is possible to reduce the size and weight, reduce the number of assembling steps, and provide a low-cost hoisting machine.

The invention according to claim 2 is characterized in that the unloaded guide roller and the drive shaft are integrally formed.
It has the same operation as the invention described in claim 1. [Embodiment] An embodiment of the present invention will be described with reference to FIGS.

In the figure, 1a and 1b are a pair of inner and outer support frames for bearing a load sheave and a drive shaft, and 2 is a drive shaft, and a brake receiver is fitted on the support frame 1a side. Then, a ratchet wheel sandwiched by a pair of brake plates is mounted on the exterior, a female screw as a driving member is screwed to the multiple thread, and a guide roller supported between the support frames 1a and 1b is provided on the other side. It has a pinion gear. The pinion gear 2a is provided at the end of the drive shaft 2 and is supported by the outer support frame 1b. The pinion gear 3a is formed integrally with the pinion gear 2 to support the support frames 1a, 1
The unloaded guide rollers 3b that are supported between b and guide the unloaded chain, and the unloaded guide rollers 3b that are supported between the support frames 1a and 1b and that guide the loaded chains,
Reference numeral 4 denotes a brake receiver that allows the drive shaft 2 to move in the axial direction and is fitted so as not to rotate relative to each other. Reference numeral 5 denotes a ratchet wheel supported on the drive shaft 2; Reference numeral 5b is a pawl that engages with the locking tooth 5a to regulate the rotation of the ratchet wheel 5 in one direction, 6 is a brake plate that is supported by the drive shaft 2 by sandwiching the ratchet wheel 5 from the left and right, and 7 is a drive shaft A free spring mounted between the portion and the female screw 8, 8 is a female screw which is a driving member screwed to a multiple thread provided on the drive shaft 2, 9 is a multiple thread, and 10 is the drive shaft 2
A female screw stopper screwed to the end portion of the shaft, 11 is a load gear meshing with the pinion gear 2a, 12 is a load sheave coaxial with the load gear 11 and supported between the support frames 1a and 1b, and 13 is wound around the load sheave. Chain, 1
Reference numeral 4 is a brake cover, 15 is a gear cover, 16 is a lever handle, 17 is a gear cover, and 18 is a hook for hanging a load.

A brake receiver 4 is fitted on one side of the drive shaft 2 about the support frames 1a, 1b so as not to rotate relative to the drive shaft 2, and abuts on a bearing step portion of the drive shaft 2. There is. In front of the brake receiver 4, a reverse rotation preventing ratchet 5 sandwiched by a pair of brake plates 6 on both sides is supported by the drive shaft 2, and a locking tooth 5a formed on the outer peripheral portion of the reverse rotating preventing ratchet 5 is provided. Further, 5b that is pivotally attached to the support frame 1a and is urged toward the locking teeth 5a is engaged to rotate the reverse rotation preventing ratchet wheel 5 only in the winding direction. The female screw 8 is screwed onto a multi-thread screw 9 provided on the drive shaft 2, and is rotated by a lever handle 16 fitted on the outer peripheral surface thereof.

On the other side of the drive shaft 2, the support frame 1
A non-load side guide roller 3a formed integrally with the drive shaft 2 is supported between a and 1b, and the pinion gear 2a is provided outside the support frame 1b so as to project therefrom.

The pinion gear 2a meshes with the load gear 11 fixed to the boss portion of the load sheave 12 outside the support frame 1b. The load side guide roller 3
b is opposite to the unloaded side guide roller 3a and the load sheave 12 and is supported by the support frames 1a and 1b.
Guide the load side chain 13.

The operation in this embodiment will be described. When the lever handle 16 fitted to the female screw 8 that is a driving member is reciprocally rotated, the female screw 8 is moved in the direction of the brake plate 6 against the free-running spring 7 by the feeding action of the multi-thread screw 9. 4 is pressed against the bearing step of the drive shaft 2. Since the brake receiver 4 is prevented from moving in the axial direction by the bearing step portion of the drive shaft 2, the female screw 8 is tightened by the multi-thread screw 9, so that the brake plate 6, the ratchet wheel 5, the brake receiver 4, and the drive shaft are driven. It rotates integrally with the shaft 2.

The unloaded guide roller 3a and the pinion gear 2a rotate together with the drive shaft 2, rotate the load sheave 12 via the load gear 11, and wind or pull the chain 13 around the load sheave 12. .
As shown in FIG. 2, the chain 13 wound by the load sheave 12 includes the unloaded side and the loaded side guide rollers 3
a and 3b are circumscribed and guide the chain to the load sheave 12.

As described in detail above, the chain hoisting machine of the present invention is a chain hoisting machine equipped with the load side and non-load side guide rollers 3a and 3b for guiding the chain 13 wound around the load sheave 12. Since the unloaded guide roller 3a and the drive shaft 2 are coaxially provided, it is possible to reduce the number of parts and the number of manufacturing processes, and to provide a small-sized, lightweight and low-cost chain hoisting machine. You can

Although the non-load side guide roller is integrally formed with the drive shaft in the above description, the non-load side guide roller may be rotatably supported on the drive shaft. The configuration may be applied. When the unloaded guide roller 3a and the drive shaft 2 are integrally formed,
The unloaded side guide roller 3a rotates integrally with the pinion 2a, but since no load is applied to the guide roller 3 and no frictional force is generated, even if the guide roller 3a rotates integrally with the pinion 2a, the guide roller 3a does not rotate. Since it is not affected by friction or the like, it is preferable to integrally form the unloaded side guide roller 3a with the drive shaft 2.

[0019]

According to the present invention, the unloaded guide roller is provided coaxially with the drive shaft, and a part of the drive shaft is used as the guide roller. The number of parts can be reduced as compared with the hoisting machine, the hoisting machine main body can be made smaller and lighter, and a low-cost hoisting machine can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a chain hoist according to the present invention.

FIG. 2 is a front view.

FIG. 3 is a schematic view of a conventional chain hoisting machine.

[Explanation of symbols]

1a, 1b Support frame 2 drive shaft 2a pinion gear 3a, 3b Guide roller 4 brake receiver 5 nail wheels 5a locking tooth 5b nail 6 brake plate 7 Idling spring 8 female screw 9 Multiple thread 10 Female screw stopper 11 Road gear 12 Road Sheave 13 chains 14 Brake cover 15 gear cover 16 lever handle 17 gear cover

Claims (2)

[Claims] 1. A chain hoist including a pinion gear provided at one end of a drive shaft, a load sheave driven via a load gear interlocking with the pinion gear, and a guide roller for guiding a chain wound around the load sheave. In the machine, a guide roller is provided coaxially with a drive shaft, and the guide roller is circumscribed on a chain wound around a load sheave. 2. A pinion gear provided at one end of a drive shaft, a load sheave driven via a load gear interlocking with the pinion gear, and a no-load side guide roller for guiding a no-load side chain wound around the load sheave. The chain hoisting machine according to claim 1, wherein the unloaded guide roller and the drive shaft are integrally formed.