JPH0460919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small hoisting and traction device used for hoisting, lowering, transporting and towing cargo.

[Prior art]

Conventionally, as a small hoisting and traction device,
- As disclosed in Publication No. 40787, a gearbox housing a reduction gear is fitted into an aluminum alloy casting box-shaped frame that opens toward the handwheel side box and an opening in the box-shaped frame. A hand chain wheel side box, which is constructed of an inner steel plate and houses a hand chain wheel and a brake section, contacts an aluminum alloy casting box-shaped frame that opens toward the opposite side of the gear box, and an open end surface of the box-shaped frame. and an outer cover fixed with screws, a partially cut-out cylinder connected to the box-shaped frame on the hand chain wheel side is in contact with the inner steel plate, and each box-shaped frame extends over them. A structure in which a plurality of bolts are inserted into the joint is known.

[Problem that the invention seeks to solve]

In the case of the conventional small hoisting and traction device, the box-shaped frame on the hand chain wheel side, which has a partially cut-out cylinder, has a complicated shape and is made of aluminum alloy casting, which is a relatively low-strength material. Since the load sheave, drive shaft, etc. are supported by the box-shaped frame of the hand chain wheel, it is necessary to increase the wall thickness of the box-shaped frame, which increases the manufacturing cost of the box-shaped frame with a partially cut-out cylindrical body. Furthermore, since a partially cut-out cylindrical body is interposed between each of the box-shaped frames,
The length of each bolt for connecting each box-shaped frame becomes long, which increases the weight and manufacturing cost.

In addition, the opening of the box-shaped frame on the hand chain wheel side, which is made of aluminum alloy casting, which is a relatively low-strength material, opens outward, so if another object collides with the opening edge of the box-shaped frame, There is a risk that the opening of the box-shaped frame may be damaged. Therefore, a metal outer cover is fixed to the outward opening of the box-shaped frame with screws to reinforce the outward opening, but if such a reinforcing means is adopted, the small hoisting and traction device There is a problem in that the weight of the device increases and the manufacturing cost increases.

[Purpose and structure of the invention]

The purpose of this invention is to provide a small-sized hoisting and traction device that can advantageously solve the above-mentioned problems. A frame for supporting the load sheave 2 and the upper hook hanging shaft 3 in a small hoisting and traction device comprising a brake part and an upper hook hanging shaft 3 is an outward opening box formed by a press-formed casting frame 4. A side plate 6 of the steel plate frame 5 and the cast frame 4 are joined together with bolts 7, and a load sheave 2 is provided within the cast frame 4. A brake part and a hand chain wheel 1 are housed in the steel plate frame 5, and a hand chain guide surface 9 is provided. This small-sized hoisting and traction device is characterized in that an upper hook hanging shaft 3 is fitted over the portion 10 and the upper part of the side plate 6 of the steel plate frame 5.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

1 to 8 show an embodiment of the present invention, in which the frame of a small hoisting and traction device is a box-shaped frame 4 made of cast iron or aluminum alloy casting or the like and press-formed. The cast frame 4 includes a recess 12 for accommodating the load sheave 2 and the chain stripper 11, a hanging shaft support protrusion 10, a load chain guide 8, and a bearing fitting recess 13. and a chain stripper supporting recess 14, and the steel plate frame 5 is opened toward the opposite side of the casting frame 4, that is, toward the outside, and furthermore, the steel plate frame 5 has a chain stripper support recess 14 on the upper side of the circumferential plate 15. An upward protrusion 16 for stopping is formed by cutting and raising it.

A support shaft 17 connected to one side of the load sheave 2 accommodated in the recess 12 is supported by a bearing 18 fitted in the bearing fitting recess 13, and is supported by a bearing 18 that is fitted in the bearing fitting recess 13. The base end of the drive shaft 19 connected to the side is supported by a bearing 20,
The bearing 20 is fitted into a through hole in the side plate 6 of the steel plate frame 5 and locked by a snap spring, and is connected to one side of the chain stripper 11 arranged at the lower part of the load sheave 2. The support protrusion 21 that is attached is fitted into the chain stripper support recess 14, and the support protrusion 22 that is connected to the other end of the chain stripper 11 is fitted into the through hole of the side plate 6, and The cast frame 4 and the steel plate frame 5 are fastened together by a plurality of bolts 7 inserted across the cast frame 4 and the side plate 6.

A female threaded hole of the brake receiver 23 and a female threaded hole of the rotating body 24 are screwed into the male threaded portion provided on the drive shaft 19, and a ratchet wheel for preventing reverse rotation is provided between the flange of the brake receiver 23 and the rotating body 24. 25 and an annular friction plate 26 arranged on both sides of the ratchet wheel 25.
A claw support shaft 2 having a head and interposed therebetween.
7 is inserted into the through hole of the side plate 6, is disposed so that the cast frame 4 is in contact with or close to the outer surface of the head of the claw support shaft 27, and is engaged with the claw wheel 25 for preventing reverse rotation. is rotatably fitted to the pawl support shaft 27, and a meshing spring 29 is engaged with the pawl 28 to engage the pawl wheel 25 for preventing reversal.

The center hole of the hand chain wheel 1 is fitted into the outer periphery of the middle part of the rotating body 24, and the holding ring 31 is fitted, and the flanges on both sides of the hand chain wheel 1, the flanges at one end of the rotating body 24, and the holding ring 31 are fitted. An annular friction plate 32 is interposed therebetween, and a disc spring 33 and a locking fitting 34 are fitted to the other end of the rotary body 24, and a torque setting nut 35 is screwed to the locking fitting. The inner protrusion 36 of 34 is fitted into a groove 37 extending in the direction of the center line of the rotating body 24, and the outer protrusion 38 of the locking fitting 34 is fitted into an engagement recess 39 provided on the outer periphery of the torque setting nut 35. It is bent and inserted.

A stopper nut 41 is screwed into a small-diameter screw rod 40 connected to the tip of the drive shaft 19, and a locking split pin 42 is inserted between the stopper nut 41 and the small-diameter screw rod 40. A gap is provided between the body 24 and the inner surface of the stopper nut 41. The rotating body 24 and the parts supported by it constitute a load limiter (friction clutch), and the brake receiver 23 and the parts supported by it and the meshing spring 29 form a ratchet wheel for preventing reverse rotation. A brake portion is constituted by the pawl piece 28 that is engaged with the rotor 25 and the rotating body 24.

A recess 51 for accommodating a trochanter 30 such as a ball or roller is provided at the hole edge of the central hole of the hand chain wheel 1,
On the hand chain wheel hoisting rotation direction side in the recess 51,
A biting slope 52 is provided on the circumferential surface of the intermediate portion of the rotary body 24 and is inclined toward the intermediate portion of the rotating body 24.
When rotated in the hoisting direction, the trochanter 30 is located in the deep part of the recess 51, and the hand chain wheel 1 is placed in the rotating body 2.
4, the rotational force of the hand chain wheel is transmitted to the rotating body 24 within the range of the set transmission torque of the load limiter.

Further, when the hand chain wheel 1 is rotated in the downward direction, the trochanter 30 is caught between the outer peripheral surface of the rotating body 24 and the engaging slope 52, so that the hand chain wheel 1 and the rotating body
are integrated and powerfully rotated in the lowering direction to perform lowering.

A load chain 43 is wound around the load sheave 2, and the end of the non-load side portion of the load chain 43 is connected to the casting frame 4 by a connecting bolt 44, and the end of the load side portion of the load chain 43 is connected to the cast frame 4 by a connecting bolt 44. The upper hook support fitting 47 has a lower hook 45 connected thereto and an upper hook 46 rotatably attached to the cast frame 4.
It is arranged between the hanging shaft supporting protrusion 10 and the side plate 6 of the steel plate frame 5.

The upper hook hanging shaft 3, which has a locking flange at one end, has a through hole in the hanging shaft supporting protrusion 10 in the cast frame 4, a through hole in the upper hook support fitting 47, and a side plate 6 in the steel plate frame 5. The other end of the upper hook hanging shaft 3 is fitted with the middle part of a retaining split pin 48 in the steel plate frame 5, and the split pin 48 is manually rotated by the hand chain wheel 1. An endless hand chain 49 is wound around the peripheral plate 1 of the steel plate frame 5.
The inner surface of 5 constitutes a hand chain guide surface 9. Further, between the upward protrusion 16 for hanging the chain on the upper part of the steel plate frame 5 and the upper hook 46, there is a hanging space 50 for hanging the middle part of the chain when the small hoisting and traction device is not in use. is provided.

FIG. 9 shows a state in which the intermediate portions of the load chain 43 and the hand chain 49 are hung on the upper part of the steel plate frame 5 when the small hoisting and traction device is not in use.

When carrying out this invention, the hand chain wheel 1 and the rotating body 24 may be constructed integrally without providing a load limiter between the hand chain wheel 1 and the rotating body 24.

〔Effect of the invention〕

According to the present invention, parts having complicated shapes such as the road chain guide part 8 in the frame of the small hoisting and traction device are constituted by the cast frame 4, and the parts housing the brake part and the hand chain wheel 1 are constructed of the cast metal frame 4. Outward opening box-shaped steel plate frame 5
Since the side plate 6 of the steel plate frame 5 and the cast frame 4 are joined and connected by bolts 7, the overall structure of the frame of the small hoisting and traction device can be simplified. The frame can be manufactured easily and lightweight, the frame can be easily assembled and disassembled, and the frame can be assembled using short bolts 7, and the outward-opening box-shaped frame 5 is made of high-strength material. Since it is made of a steel plate, it is possible to provide sufficient strength without fixing a reinforcing lid to the outward opening.

[Brief explanation of the drawing]

Figures 1 to 8 show an embodiment of the present invention, in which Figure 1 is a vertical sectional side view showing a part of a small hoisting and traction device, and Figure 2 is a part of Figure 1. Fig. 3 is a side view of the small hoisting and traction device, Fig. 4 is its front view, Fig. 5 is a rear view of the small hoisting and traction device, and Fig. 6 is the casting. 7 is a sectional view taken along the line A-A in FIG. 6, and FIG. 8 is a sectional view taken along the line B-B in FIG. 2. FIG. 9 is a rear view showing a state in which the middle part of the chain is hung on the upper part of the steel plate frame. In the figure, 1 is a hand chain wheel, 2 is a road sheave,
3 is an upper hook suspension shaft, 4 is a cast frame, 5 is a steel plate frame, 6 is a side plate, 7 is a bolt, 8 is a load chain guide portion, 9 is a hand chain guide surface, 10 is a protrusion for supporting the suspension shaft, 11 is a chain stripper,
15 is a peripheral plate, 16 is an upward protrusion for hanging the chain, 17 is a support shaft, 18 is a bearing, 19 is a drive shaft, 2
0 is a bearing, 23 is a brake bearing, 24 is a rotating body, 2
5 is a ratchet wheel for preventing reverse rotation, 26 is a friction plate, 28 is a pawl piece, 31 is a holding ring, 32 is a friction plate, 33 is a disc spring, 35 is a torque setting nut, 40 is a small diameter screw, and 41 is a stopper nut. , 43 is a load chain, 45 is a lower hook, 47 is an upper hook support fitting, 49 is a hand chain, and 50 is a latching space.

Claims (1)

[Claims] 1. In a small hoisting and traction device comprising a load sheave 2 rotated by a hand chain wheel 1, a brake section, and an upper hook suspension shaft 3, the frame supporting the load sheave 2 and the upper hook suspension shaft 3 is made of cast metal. It is composed of a frame 4 made of steel and a frame 5 made of steel plate in the shape of a press-formed outward opening box, and the side plate 6 of the frame 5 made of steel plate and the cast frame 4 are joined to each other and connected with bolts 7, A load sheave 2 is provided within the cast frame 4, and a load chain guide portion 8 is formed,
A brake part and a hand chain wheel 1 are housed in the steel frame 5, and a hand chain guide surface 9 is provided. This small-sized hoisting and traction device is characterized in that an upper hook hanging shaft 3 is fitted across the upper part.