JPH025668B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a small hoisting and traction device used for hoisting and towing various types of cargo.

[Prior art]

Conventionally, as a small hoisting and traction device, the special public
As disclosed in Publication No. 9381, the load sheave is installed between the first frame and the second frame, which are arranged parallel to each other at an interval, and is rotated by repeated rocking of a manual operation lever. A drive shaft that transmits rotational force to the load sheave,
A brake device for preventing reverse rotation of a load sheave is comprised of a ratchet wheel, friction plates arranged on both sides of the ratchet wheel, and a pawl piece that engages with the ratchet wheel, and a brake cover that covers the brake device.
A structure is known in which the brake cover is rotatably attached to the frame by a pawl shaft, and the first frame, second frame, and brake cover are connected by stepped bolts.

However, in the case of a small-sized hoisting and traction device with this structure, the attachment strength of the claw piece is weak, and the first frame and the second frame are not connected in the part where the claw piece is present, so this part is difficult to connect. There is a problem that the frame strength is weak.

[Purpose and structure of the invention]

The object of the present invention is to provide a small-sized hoisting and traction device that can advantageously solve the above-mentioned problems. A load sheave 3 provided between the frame 1 and the second frame 2, a drive shaft 4 that is rotated by manual operation and transmits rotational force to the load sheave 3, a ratchet wheel 5, and a drive shaft 4 disposed on both sides thereof. In a small hoisting and traction device equipped with a brake device for preventing reverse rotation of a load sheave consisting of a friction plate 6 and a pawl piece 7 that engages with its pawl wheel 5, and a brake cover 8 covering the brake device, The large outer diameter portion 9 of the stepped sleeve 12 includes a large outer diameter portion 9 and a small outer diameter portion 10 on one side and the other side, and a middle outer diameter portion 11 in the middle. It is interposed between the second frame 2, the medium outer diameter section 11 is fitted into the through hole of the second frame 2, and the claw piece 7 of the brake device is rotatably fitted into the small outer diameter section 10. , the connecting bolt 13 is inserted through the first frame 1, the stepped sleeve 12, and the through hole of the brake cover 8, and the connecting bolt 13
The brake cover 8 is secured by the nut 14 screwed onto the
This is a small-sized hoisting and traction device characterized by being fastened to the end face of the stepped sleeve 12 and the second frame 2.

〔Example〕

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

FIG. 3 shows a stepped sleeve 12 used in an embodiment of the present invention, in which a sleeve having a through-hole 15 for bolt insertion has a large section extending from one side in the longitudinal direction to the other side. outer diameter part 9,
A medium outer diameter portion 11 and a small outer diameter portion 10 are formed in sequence.

4 and 5 show a bearing/chain guide 16 used in an embodiment of the present invention, which is made of a single steel plate that is pressed and has a cover plate 17 at one end and a cover plate 17 at one end. A cylindrical body 19 having an outward flange 18 at its end, a groove-shaped chain guide 20 projecting outward in the middle upper half of the cylindrical body 19, and an opening provided in the middle lower half of the cylindrical body 19. 21 and a notch 22 located at the bottom of the outward flange 18.

1 and 2 show a small hoisting and traction device according to an embodiment of the present invention using the stepped sleeve 12 and the bearing and chain guide 16, in which a first frame 1 made of a steel plate and second frames 2 are arranged in parallel at intervals,
In addition, the outward flange 18 of the bearing/chain guide 16 is fitted and locked into the locking hole of the second frame 2, and the end of the cylindrical body 19 on the cover plate side of the bearing/chain guide 16 is connected to the transparent part of the first frame 1. A drive shaft 4 is fitted into the hole and is unrotatably inserted into the center of a rotating body 24 having a load sheave 3 and a brake receiving part 23 in the middle part, and is fitted into one end of the drive shaft 4. The stopped split ring 25 is engaged with one end of the rotating body 24, and the circumferential surfaces on both sides of the load sheave 3 on the rotating body 24 are rotatably fitted into the cylindrical body 19 of the bearing/chain guide 16. has been done.

a drive member 28 including a switching gear 27 on a brake screw 26 provided on the other end side of the drive shaft 4;
A male thread 29 having a smaller diameter than the brake screw 26 is provided at the other end of the drive shaft 4, and a stopper nut 30 is threaded onto the male thread 29.
is engaged with the end of the brake screw 26 and fixed to the male screw 29 by a locking pin 31, and is further provided between the other end of the rotating body 24 and the drive member 28 for tightening the brake of the drive member 28. A resistance spring 32 consisting of a helical spring resisting directional movement is interposed in a compressed state.

The upper part of the spacer/chain stripper 33 interposed in the lower part between the first frame 1 and the second frame 2 is inserted into the lower part of the load sheave 3 through the opening 21 in the bearing/chain guide 16. And spacer and chain stripper 3
A locking shaft 34 provided at one end of the spacer/chain stripper 33 is fitted into a through hole of the first frame 1, and a locking protrusion 35 provided at the other end of the spacer/chain stripper 33 acts as a bearing/chain guide. The connecting bolt 36 is inserted into the notch 22 of the outward flange 18 at 16, and is further inserted through the flanges of the first frame 1, the spacer/chain stripper 33, the second frame 2, and the steel plate brake cover 8. A locking square shaft portion 37 provided at the base end of the coupling bolt 36 is fitted into a square hole in the first frame 1, and a nut 38 is screwed into the tip of the coupling bolt 36. There is.

On the outer periphery of the other end of the rotary body 24, between the brake receiving part 23 and the drive member 28, a ratchet wheel 5, a bearing ring 39 located inside the ratchet wheel 5, and friction plates 6 arranged on both sides thereof. The middle outer diameter portion 11 of the stepped sleeve 12 is fitted into the stepped sleeve 12.
The large outer diameter portion 9 is inserted into the through hole of the frame 2 and is interposed between the first frame 1 and the second frame 2, and the claw piece 7 that engages with the ratchet wheel 5 is inserted into the small outer diameter portion 1.
The engagement spring 40 is rotatably fitted into the second frame 2 and the claw piece 7 and works to engage the claw piece 7 with the ratchet wheel 5. It is locked to.

The coupling bolt 13 is inserted into the through hole of the first frame 1, the stepped sleeve 12, and the brake cover 8, and the anti-rotation square shaft portion 37 provided at the base end of the coupling bolt 13 is inserted into the first frame 1, the stepped sleeve 12, and the brake cover 8. 1, and a nut 14 is screwed onto the tip of the coupling bolt 13, and the brake cover 8 is tightened and fixed to the end surface of the stepped sleeve 12 and the second frame 2 by the nut 14. and the first frame 1 and the second frame 2 are connected with the connecting bolt 1
3 and a stepped sleeve 12.

The base end of the manual operation lever 41 is connected to the drive member 28.
One side of the lever 41 is rotatably fitted into a circular opening provided in the brake cover 8, and a support shaft rotatably attached to the lever 41 is rotatably fitted into the lever 41. A switching claw fitting 43 having a forward rotation claw piece and a reverse rotation claw piece and a handle 44 are fixed to the lever 41 , and a spring 4 is fixed to the lever 41 .
5, the holding piece 46 is pressed against the switching claw fitting 43.
is slidably mounted. Further, an upper hook support fitting 48 to which an upper hook 47 for hanging the small-sized hoisting and traction device is attached is interposed and attached to the upper part between the first frame 1 and the second frame 2.

The above embodiment is an example in which the present invention is applied to a lever-type small-sized hoisting and traction device, but this invention is a small-sized hoisting and traction device consisting of a manual chain block that rotates a drive member via a sprocket by a manually operated chain. It can also be implemented in a device.

〔Effect of the invention〕

According to this invention, the load sheave 3 is provided between the first frame 1 and the second frame 2 which are arranged parallel to each other with an interval, and the load sheave 3 is rotated by manual operation to apply a rotational force to the load sheave 3. A brake device for preventing reverse rotation of a load sheave consisting of a drive shaft 4 for transmission, a ratchet wheel 5, friction plates 6 disposed on both sides of the ratchet wheel 5, and claw pieces 7 that engage with the ratchet wheel 5, and a brake covering the brake device. In a small hoisting and traction device comprising a cover 8,
A large outer diameter portion 9 and a small outer diameter portion 10 are provided on one side and the other side in the longitudinal direction, and a medium outer diameter portion 1 is provided in the middle.
1, the large outer diameter portion 9 of the stepped sleeve 12 is interposed between the first frame 1 and the second frame 2, and the medium outer diameter portion 11 is fitted into the through hole of the second frame 2. Since the claw pieces 7 of the brake device are rotatably fitted into the small outer diameter portion 10, the stepped sleeve 12 is supported by the claw pieces 7 and maintains the distance between the first frame 1 and the second frame 2. In addition, since the connecting bolt 13 is inserted through the first frame 1, the stepped sleeve 12, and the through hole of the brake cover 8, the claw piece 7 can be connected to the stepped sleeve 12 and the through hole of the brake cover 8. The first frame 1 and the second frame can be firmly supported by the large-diameter double-structure holding member consisting of the coupling bolt 13 inserted therein, and furthermore, the stepped sleeve 12 and the coupling bolt 13 support the first frame 1 and the second frame. 2
The part facing the claw piece 7 can be firmly connected, and the brake cover 8 can be tightened against the end surface of the stepped sleeve 12 and the second frame 2 by the nut 14 screwed onto the connecting bolt 13. Since it is fixed, after the nut 14 is tightened until the brake cover 8 hits the end surface of the stepped sleeve 12, the tightening movement of the brake cover 8 by the nut 14 is restricted. Effects such as being able to prevent the brake cover 8 from being deformed and the claw pieces 7 from being pressed by the brake cover 8 due to the tightening can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a small hoisting and traction device according to an embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional side view of a part of FIG. 1. FIG. 3 is a partially longitudinal side view of a stepped sleeve used in an embodiment of the present invention, and FIG. 4 is a front view of a bearing and chain guide used in an embodiment of the present invention.
FIG. 5 is a longitudinal sectional side view thereof. In the figure, 1 is the first frame, 2 is the second frame, 3 is the load sheave, 4 is the drive shaft, 5 is the ratchet wheel, 6 is the friction plate, 7 is the claw piece, 8 is the brake cover, 9 is the large outer diameter 10 is a small outer diameter section, 11 is a medium outer diameter section, 12 is a stepped sleeve, 13 is a coupling bolt, 14 is a nut, 16 is a bearing/chain guide, 23 is a brake receiving section, 24 is a rotating body, 26 27 is a brake screw, 27 is a switching gear, 28 is a driving member, 36 is a coupling bolt, 37 is a rotation preventing square shaft portion, 40 is an engagement spring, 41 is a lever for manual operation, and 43 is a switching claw metal fitting.

Claims (1)

[Claims] 1. A load sheave 3 provided between a first frame 1 and a second frame 2 that are arranged in parallel with an interval, and a drive shaft 4 that is rotated by manual operation and transmits rotational force to the load sheave 3. and,
It is equipped with a brake device for preventing reverse rotation of the load sheave consisting of a ratchet wheel 5, friction plates 6 arranged on both sides of the ratchet wheel 5, and claw pieces 7 that engage with the ratchet wheel 5, and a brake cover 8 that covers the brake device. In a small hoisting and traction device, the stepped sleeve 12 has a large outer diameter section 9 and a small outer diameter section 10 on one side and the other side in the longitudinal direction, and has a medium outer diameter section 11 in the middle. The outer diameter portion 9 is the first
interposed between frame 1 and second frame 2,
The medium outer diameter portion 11 is fitted into the through hole of the second frame 2, and the claw piece 7 of the brake device is inserted into the small outer diameter portion 10.
The connecting bolt 13 is rotatably fitted into the first
The brake cover 8 is connected to the end surface of the stepped sleeve 12 and the second
A small hoisting and traction device characterized by being tightened and fixed to a frame 2.