JPH0640219Y2 - Lever pivot structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lever pivot structure for a towing hoist.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, an aluminum lever body 15 and an aluminum case cover 16 are rotatably inserted into a pivotal connection portion between a lever side and a body case side of a tow hoist. , It was connected by a retaining ring 17 that prevents it from slipping out.

In the case of a sheet metal product, as shown in FIG. 6, first, the outer peripheral wall of the hole 20 of the sheet metal lever cover 18 is inserted into the opening 21 of the sheet metal case cover 19. .

The lever cover is provided in the opening 21.
The case cover 19 and the lever cover 18 were rotatably connected to each other by winding one end 22 of the hole portion 20 of the 18 therein.

[0005]

However, the hole portion of the case cover 19 of the pivotal portion constructed as shown in FIG.
There is a considerable gap or play between the periphery of 20 and the lever cover 18 formed by winding.

It is difficult to completely eliminate this by entanglement molding.

Therefore, when the lever is rotated, the lever is not smoothly rotated and rattling occurs.

Further, at the time of rotation, the sheet metal lever cover 18
The inner surface of the opening 21 of the sheet metal case cover 19 that comes into contact with
Since the thickness of the plate was only slightly, the contact surface was easily worn and had no durability.

Further, since the lever cover 18 and the case cover 19 are integrated, it is uneconomical to disassemble and repair or replace only one of them.

Next, the aluminum pivotal connecting portion constructed as shown in FIG. 5 is expensive in material as compared with the one made of sheet metal, resulting in high production cost.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides a pivot structure for a lever of a towing hoist which has stable quality, improved durability, and reduced production cost. With the goal.

[0012]

[Means for Solving the Problems] One end of a cylindrical boss member having an outer peripheral groove is inserted into a hole portion of a sheet metal lever cover,
The one end is crimped and integrated, and a reinforcing ring is wound around and fixed to the opening of the sheet metal case cover. The cylindrical boss member is rotatably inserted into the opening, and the retaining ring is attached to the outer circumference. It is fitted in the groove to prevent it from coming off.

[0013]

In the pivoting structure of the lever of the traction hoisting machine constructed as described above, the inner diameter of the opening of the case cover and the outer diameter of the cylindrical boss member should be manufactured relatively accurately. Is possible.

Therefore, the clearance between the outer peripheral surface of the cylindrical boss member of the pivotal portion and the inner peripheral surface of the opening of the sheet metal case cover can be eliminated so that only a rotatable portion can be provided. Further, the inner peripheral surface that comes into contact with the surface can be wide.

Therefore, when the lever is rotated, the lever is smoothly rotated without rattling.

Further, the pivotal connecting structure of the lever of the tow hoist can be molded by sheet metal without using aluminum.

Further, the case cover and the lever body can be disassembled.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments.

FIG. 1 shows a lever pivot structure according to the present invention. First, one end 3 of a cylindrical boss member 2 having an outer peripheral groove 1 is formed.
Is inserted into the hole 5 of the sheet metal lever cover 4.

By the way, as shown in FIG. 2, a proper number of detent holes 11 ... Of arbitrary shape are formed in the peripheral edge of the hole 5 of the sheet metal lever cover 4.

That is, as shown in FIG. 1 and FIG.
The peripheral edge portion forming the above is plastically worked into a W shape, and burring processing is performed, and the holes 11 are made to correspond to the corner portions.

Then, one end 3 of the cylindrical boss member 2 is made thin and is crimped to be integrated with the lever cover 4.

Further, a reinforcing ring 8 is wound around and fixed to the opening 7 of the sheet metal case cover 6--generally corresponding to a brake cover--to form a parallel portion W, The cylindrical boss member 2 is rotatably inserted into the opening 7 together with the thrust washer 12.

Then, the retaining ring 9 is fitted into the outer peripheral groove 1 to prevent the retaining ring 9 from coming off.

The lever cover 4 is integrally fixed to the back surface of the lever body 14 made of sheet metal near the boss portion (by a bolt (not shown) or the like). Further, the case cover 6 is attached in a lid-like manner to a case main body having a gear and a load sheave built therein.

Although the thrust washer 12 is interposed between the lever cover 4 and the case cover 6 in the illustrated example, it may be omitted if desired.

As is apparent from FIG. 1, the cylindrical boss member 2
The clearance between the outer peripheral surface of the sheet metal case cover 6 and the inner peripheral surface of the opening 7 of the case cover 6 can be eliminated so that the clearance can be rotated.

Further, since the parallel portion W of the opening 7 is long, the contact surface is widened and the contact surface pressure is reduced,
It is possible to reduce rattling and wear at the time of rotation.

When caulking one end 3 of the cylindrical boss member 2 and the sheet metal lever cover 4 having the rotation preventing holes 11 ...
The lever cover 4 and the cylindrical boss member 2 can be easily provided by inserting a part of the one end 3 into the anti-rotation hole 11 ...
It can be stopped at the same time as caulking.

Unlike the case of the above embodiment, as shown in FIGS. 3 and 4, the hole 5 of the sheet metal lever cover 4 has a simple shape in which the burring process (described in FIG. 1 above) is omitted. Is also preferable.

An appropriate number of notches 13 are provided at the peripheral edge of the hole 5, and the end 5 of the cylindrical boss member 2 is provided in the hole 5.
Is inserted, and the one end 3 is caulked to be integrated.

At this time, a part of the cylindrical boss member 2 is inserted into the cutout portion 13 ...

Although the notches 13 are U-shaped in the illustrated example, they may be of various shapes such as U-shape and semicircle.

Further, in FIG. 2 or FIG. 4, a rotation preventing hole is provided.
The number of 11 or notches 13 can be freely increased or decreased.

[0035]

As described above, according to the present invention, a lever in which the cylindrical boss member 2 and the sheet metal lever cover 4 are integrated with each other.
10 and the sheet metal case cover 6 are rotatable, and the clearance between the outer peripheral surface of the cylindrical boss member 2 and the inner peripheral surface of the opening 7 of the sheet metal case cover 6 is within a rotatable range.
Can be made small with high precision.

Further, due to the long parallel portion W formed on the inner peripheral surface of the opening 7, the contact surface between the outer peripheral surface and the inner peripheral surface is widened and the contact surface pressure is reduced.

Therefore, when the lever 10 is rotated, there is no rattling, so that the lever 10 can be rotated smoothly, the contact surface is less likely to be worn, and the quality is stable and the durability is improved.

Further, since the pivotal connecting structure of the lever can be formed by sheet metal without using aluminum, the material cost becomes low and the production cost can be reduced.

Furthermore, the sheet metal case cover 6 and the lever 10
It is economical because it can be disassembled and only one can be replaced or repaired.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a front view of the lever cover in an unassembled state.

FIG. 3 is a cross-sectional view of a main part showing a modified example.

FIG. 4 is a front view of another example of the lever cover that is not assembled.

FIG. 5 is a cross-sectional view of a main part showing a conventional example.

FIG. 6 is a cross-sectional view of a main part showing a conventional example.

[Explanation of symbols]

 1 Outer peripheral groove 2 Cylindrical boss member 3 One end 4 Sheet metal lever cover 5 Hole 6 Sheet metal case cover 7 Opening 8 Reinforcing ring 9 Retaining ring

Claims (1)

[Scope of utility model registration request] 1. An end 3 of a cylindrical boss member 2 having an outer peripheral groove 1 is inserted into a hole 5 of a sheet metal lever cover 4, the end 3 is swaged to be integrated, and a sheet metal case cover 6 is provided. A reinforcing ring 8 is wound around and fixed to the opening 7, and the cylindrical boss member 2 is rotatably inserted into the opening 7, and a retaining ring 9 is fitted into the outer peripheral groove 1 to prevent the retaining. The pivot structure of the lever, which is characterized in that.