JPH025667B2 - - 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, a small hoisting and traction device consists of a load sheave that wraps around a load chain, a drive shaft that is manufactured integrally with the load sheave, and a brake screw on the drive shaft that is screwed into the drive shaft and rotated by manual operation. A structure comprising a driving member, and a brake device for preventing reversal of a rotary body, which is comprised of a brake receiving member, a ratchet wheel, a friction plate, and a claw piece that engages with the ratchet wheel, interposed between the load sheave and the driving member. are known.

Since the chain fitting groove in the load sheave has a complicated shape, it is difficult to form the groove by cutting.Therefore, the load sheave and the drive shaft are made of spheroidal graphite cast iron. On the other hand, since the drive shaft has a relatively small cross section, it is required to have great mechanical strength, and it is necessary to cut and form a highly accurate brake screw on the drive shaft.

However, in the case of a drive shaft made of spheroidal graphite cast iron, the mechanical strength is weaker than that of a steel drive shaft, and it is difficult to cut and form a brake screw with high precision.

[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 drive shaft 4 manufactured integrally with the load sheave 1, a drive member 6 screwed onto the brake screw 5 of the drive shaft 4 and rotated by manual operation, and interposed between the load sheave 1 and the drive member 6. A small hoisting and traction device comprising a brake receiving part 2, a pawl wheel 7, a friction plate 8, and a brake device for preventing the rotational body from reversing, which includes a pawl piece 9 that engages with the pawl wheel 7. The rotating body 3 having the sheave 1 and the brake receiving part 2 is made of cast iron, and
A small hoisting and traction device characterized in that a drive shaft 4 is manufactured separately from a rotating body 3 from a steel material, and the drive shaft 4 is fitted into a center hole 10 of the rotating body 3 so as not to rotate. .

〔Example〕

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

3 and 4 show a rotating body 3 made of spheroidal graphite cast iron used in an embodiment of the present invention, which has a load sheave 1 on one side and a brake receiver 2 around the other side. A center hole 10 is provided in the rotating body 3 having a rotor 3, and spline grooves 11 are provided on both sides of the center hole 10 in the diametrical direction.

FIG. 5 shows a steel drive shaft 4 used in an embodiment of the invention, and shows the drive shaft body 1.
A spline 13 extending in the longitudinal direction of the drive shaft is integrally provided on one side of the drive shaft body 12 in the diametrical direction, and an annular locking groove 14 is provided at one end of the drive shaft body 12. Drive shaft body 1
A brake screw 5 is provided at the other end of the drive shaft body 12, and a male thread 15 having a smaller diameter than the brake screw 5 is provided at the other end of the drive shaft body 12.
A pin hole 16 is provided in the portion having 5.

FIGS. 6 and 7 show a bearing/chain guide 17 used in an embodiment of the present invention, which is made of a single steel plate that is pressed and has a cover plate 18 at one end and a cover plate 18 at one end. A cylindrical body 20 having an outward flange 19 at its end, a groove-shaped chain guide 21 projecting outward in the middle upper half of the cylindrical body 20, and an opening provided in the middle lower half of the cylindrical body 20. 22 and a notch 23 located at the bottom of the outward flange 19.

1 and 2 show the rotating body 3 and the drive shaft 4.
This figure shows a small hoisting and traction device according to an embodiment of the present invention using a bearing and chain guide 17, in which a first frame 24 and a second frame 25 made of steel plates are arranged in parallel with an interval. The outward flange 19 of the bearing and chain guide 17 is fitted and locked into the locking hole of the second frame 25, and the end of the cylindrical body 20 on the cover plate side of the bearing and chain guide 17 is connected to the first frame 24.
It is fitted into the through hole of the rotating body 3, and further unrotatably fitted into the center hole 10 of the rotating body 3, and is fitted and locked into the annular locking groove at one end of the drive shaft 4. The split ring 26 that is fitted and locked at one end is engaged with one end of the rotating body 3, and the circumferential surfaces on both sides of the load sheave 1 on the rotating body 3 are inserted into the cylindrical body 20 of the bearing and chain guide 17. They are rotatably fitted.

A drive member 6 having a switching gear 27 is screwed into a brake screw 5 provided at the other end of the drive shaft 4, and is also screwed into a male thread 15 provided at the other end of the drive shaft 4. Stopper nut 28
is engaged with the end of the brake screw 5 and fixed to the male screw 15 by a locking pin 29, and is further provided between the other end of the rotating body 3 and the drive member 6 for tightening the brake of the drive member 6. A resistance spring 30, consisting of a helical spring that resists directional movement, is interposed in a compressed state.

The first frame 24 and the second frame 25
The upper part of the spacer/chain stripper 31 interposed in the lower part between the bearing and chain guide 17
The locking shaft 32, which is inserted into the lower part of the load sheave 1 through the opening 22 in the spacer and provided at one end of the spacer/chain stripper 31, is fitted into the through hole of the first frame 24, and the spacer A locking protrusion 33 provided at the other end of the chain stripper 31 is fitted into a notch 23 of the outward flange 19 of the bearing and chain guide 17.
Further, the connecting bolt 34 is inserted through the flanges of the first frame 24, the spacer/chain stripper 31, the second frame 25, and the steel plate brake cover 35, and is inserted around the flange of the connecting bolt 34 provided at the base end. The fixing square shaft part 36 is fitted into the square hole of the first frame 24, and the coupling bolt 3
A nut 37 is screwed onto the tip of 4.

A brake receiving portion 2 is provided on the outer periphery of the other end of the rotating body 3.
A ratchet wheel 7, a bearing ring 38 located inside the ratchet wheel 7, and friction plates 8 disposed on both sides thereof are fitted between the large outer diameter portion 3 and the drive member 6.
9. The middle outer diameter portion 4 of the stepped sleeve 42 in which the middle outer diameter portion 40 and the small outer diameter portion 41 are sequentially formed.
0 is inserted into the through hole of the second frame 25, and the large outer diameter portion 39 is inserted between the first frame 24 and the second frame 2.
A pawl piece 9 which is interposed between the pawl piece 5 and the ratchet wheel 7 and which engages the ratchet wheel 7 is rotatably fitted into the small outer diameter portion 41 and serves to engage the pawl piece 9 with the ratchet wheel 7. The combined spring 43 is fitted into the middle outer diameter portion 40 and is locked to the second frame 25 and the claw pieces 9.

The coupling bolt 44 is inserted through the through holes of the first frame 24, the stepped sleeve 42, and the brake cover 35, and the anti-rotation square shaft portion 36 provided at the base end of the coupling bolt 44 is inserted into the first frame 24, the stepped sleeve 42, and the brake cover 35. 2
4, and a nut 45 is screwed onto the tip of the coupling bolt 44.
Due to this, the brake cover 35 is attached to the stepped sleeve 42.
and the second frame 25 , and the first frame 24 and the second frame 25 are integrally connected via a connecting bolt 44 and a stepped sleeve 42 .

A base end portion of the manual operation lever 46 is rotatably fitted to the drive member 6, and one side portion of the lever 46 is rotatably fitted to a circular opening provided in the brake cover 35. A switching claw fitting 48 having a forward rotation claw piece and a reverse rotation claw piece and a handle 49 are fixed to a support shaft 47 rotatably attached to the lever 46 , and a spring 5 is attached to the lever 46 .
0, the holding piece 51 is pressed against the switching claw fitting 48.
is slidably mounted. Further, an upper hook support fitting 53 to which an upper hook 52 for hanging the small-sized hoisting and traction device is attached is interposed and attached to the upper part between the first frame 24 and the second frame 25.

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, there is a load sheave 1 around which a load chain is wound, a drive shaft 4 manufactured integrally with the load sheave 1, and a brake screw 5 of the drive shaft 4 that is screwed into the drive shaft 4 and rotated by manual operation. A rotor for preventing reverse rotation of a rotating body, consisting of a driving member 6, a brake receiver 2 interposed between the load sheave 1 and the driving member 6, a ratchet wheel 7, a friction plate 8, and a pawl piece 9 that engages with the ratchet wheel 7. In a small hoisting and traction device equipped with a brake device, the rotary body 3 having the load sheave 1 and the brake receiving portion 2 is made of cast iron, and the drive shaft 4 is made of steel and is separate from the rotary body 3. The drive shaft 4 is fitted into the center hole 10 of the rotary body 3 in a non-rotatable manner, so that it is equipped with a load sheave 1 having a complex-shaped load chain fitting groove and a brake receiving part 2. The rotating body 3 can be easily manufactured by casting, and the drive shaft 4 that rotates integrally with the rotating body can be manufactured from steel, giving the drive shaft 4 great mechanical strength and high precision. This provides the advantage that the brake screw 5 can be formed by cutting.

[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 longitudinal sectional side view of a rotating body used in an embodiment of the present invention, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG. 5 is a side view of a drive shaft used in an embodiment of this invention. 6 is a front view of a bearing/chain guide used in an embodiment of the present invention, and FIG. 7 is a longitudinal sectional side view thereof. In the figure, 1 is a load sheave, 2 is a brake receiver, 3 is a rotating body, 4 is a drive shaft, 5 is a brake screw, 6 is a drive member, 7 is a ratchet wheel, 8 is a friction plate, 9 is a pawl piece, 10 is a center hole, 11 is a spline groove, 13 is a
14 is a spline, 14 is an annular locking groove, 15 is a male screw, 17 is a bearing/chain guide, 24 is a first frame, 25 is a second frame, 26 is a split ring, 28 is a stopper nut, 30 is a resistance spring,
31 is a spacer/chain stripper, 34 is a coupling bolt, 36 is a square shaft for preventing rotation, 37 is a nut, 42 is a stepped sleeve, 44 is a coupling bolt, 45 is a nut, and 46 is a lever for manual operation. It is.

Claims (1)

[Claims] 1 Load sheave 1 for winding the load chain
, a drive shaft 4 manufactured integrally with the load sheave 1, a drive member 6 that is screwed onto the brake screw 5 of the drive shaft 4 and rotated by manual operation, and a A small-sized hoisting and traction device comprising a brake receiving part 2, a ratchet wheel 7, a friction plate 8, and a brake device for preventing reverse rotation of a rotary body consisting of a pawl piece 9 that engages with the ratchet wheel 7 interposed therebetween. The rotary body 3 having the load sheave 1 and the brake receiving part 2 is made of cast iron, and the drive shaft 4 is made of steel separately from the rotary body 3, and the drive shaft is inserted into the center hole 10 of the rotary body 3. A small hoisting and traction device characterized in that 4 is fitted in a non-rotatable manner.