JPH1019025A - Handle fixing mechanism using washer with foot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate looseness of a handle by a simple means in a fixing mechanism for fixing the handle to an operating rod by means of screw, thereby restrain wear of a square shaft part of the operating rod and a square hole of the handle, and eliminate looseness of the screw. SOLUTION: In a handle fixing mechanism for fixing a handle 5 to an operating rod 1, a washer 7 with a foot which has a ring-like part 7a bent-formed from a metal plate and having the function of spring washer, and a wedge- shaped foot part 7b provided inside the ring-like part, is used. The washer 7 is clamped by a nut 9 in state where the foot part 7b is fitted into a gap between a square shaft part 2 of the operating rod 1 and a square hole 6 of the handle 5. Thus, the handle 5 is mounted to the operating rod 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handle fixing mechanism for fixing a handle for operating a valve or other various devices in a pipe to an operating rod of the device. The present invention relates to a handle fixing mechanism using a washer with a foot.

[0002]

2. Description of the Related Art As shown in FIG.
In the fixing mechanism for fixing the handle 21 to the operating rod 2, the square shaft portion 23 of the operation rod 20 is fitted into the operation rod insertion square hole 22 in the hub of the handle 21, and the operation rod 2 is
Generally, a nut 26 is fastened and fixed to the 0 male screw portion 24. In addition, the male screw part 24 and the nut 26
Alternatively, a means of providing a female screw portion in the distal end hole of the operation rod 20 and screwing the handle via a washer is used.

When the operating rod 20 and the handle 21 are fixed as described above, the square rod portion 23 of the operating rod is generally not tightly inserted into the square hole 22 for inserting the operating rod. In order to easily fit into the square hole 22,
It is loosely fitted with a certain gap between it and the inner surface. Further, the fastening of the nut 26 to the male screw portion 24 does not fix the operating rod 20 and the handle 21 to each other by the fastening force, but merely prevents the handle 21 from being detached from the operating rod 20. is there. Therefore, the square shaft portion 23 of the operating rod 20 and the square hole 2 of the handle 21 are
There is generally some backlash between the two.

[0004] Even if the fastening of the nut 26 merely prevents the handle 21 from being detached from the operating rod 20, the looseness of the nut 26 promotes the play.
In order to prevent the nut 26 from being loosened, as the washer 25 used for fastening the nut, a coiled spring washer having a locking action against a screw, a round washer with teeth on the inner and outer circumferences, Although there is a disc-shaped disc spring washer having a hole at the center, there is play between the square shaft portion 23 of the operating rod 20 and the square hole 22 of the handle 21 as described above, so that the handle is repeatedly used. It is unavoidable that the nut 26 is loosened with the rotation operation. In addition, valves and the like to which the above-mentioned handle is attached are used in fixed devices such as factories, industrial complexes, power plants, etc., or mobile devices typified by special vehicles such as tank trucks and fire trucks and ships. In many cases, the nut is loosely used or used in an environment where the temperature changes greatly, and loosening of the nut is inevitable.

If the handle 21 is used in a situation where there is such play, the corner of the square shaft 23 always collides with the same position in the plane portion of the square hole 22 of the handle 21 when the handle is operated, Further, the pressure contact portion is pressed at that position, and the pressure contact portion thereof is worn due to repeated collision and pressure contact due to aging, and the backlash is further increased. Is rotated, and the rotation operation of the handle 21 becomes impossible.

[0006]

The technical problem to be solved by the present invention is to eliminate the backlash of the handle by simple means, whereby the corner of the square shaft portion of the operating rod and the flat surface of the square hole in the handle are eliminated. An object of the present invention is to provide a handle fixing mechanism that suppresses abrasion of a portion and prevents the handle from rotating with respect to an operation rod. Another technical object of the present invention is to provide a handle fixing mechanism capable of suppressing backlash of the handle by means of using a simple washer with a foot. Another technical object of the present invention is to provide a handle fixing mechanism capable of preventing loosening of a screw in a screw connecting means by suppressing the above-mentioned play. Still another technical object of the present invention is to provide a simple handle fixing mechanism that can be easily applied to an existing handle fixing mechanism.

[0007]

A handle fixing mechanism according to the present invention for solving the above-mentioned problems has a square shaft portion of an operating rod of various devices inserted into a square hole of the handle, and the handle is operated by screw coupling means. In a handle fixing mechanism for fixing to a rod, a ring-shaped washer having a function of a spring washer and a wedge-shaped foot located around an operation rod insertion hole inside the spring-washed part is a washer with a foot formed of a metal plate. Using a washer formed by bending a portion of the operating rod insertion hole in the metal plate around the insertion hole in a direction along the surface of the square shaft portion of the operating rod, the foot portion and the square shaft portion of the operating rod are used. In a state where the foot is pushed into the gap between the handle and the square hole, the washer with the foot is fitted into the operation rod, and the handle is attached to the operation rod through the washer by the screw coupling means. Is what you do.

In the handle fixing mechanism having the above structure, when the handle is fixed to the operating rod, a wedge-shaped foot of a washer with a foot is fitted into a gap between a square shaft portion of the operating rod and a square hole of the handle. But if the gap is small,
The square hole in the handle is shaped to fit the wedge-shaped foot. When applying to the existing handle fixing mechanism, a washer with a foot will be added, but if the square hole of the handle is machined into a shape suitable for insertion of the foot of the washer with the foot by cutting or the like. Good.

Then, a square hole of the handle is fitted into the square shaft of the operating rod, and a wedge-shaped foot of a washer with a foot is fitted into a gap between the square shaft and the square hole. When the handle is fixed via the washer by fastening the screw coupling means, the handle can be fixed without play on the operation rod, and the fixing means is also simple. As described above, when the handle is eliminated, wear of the corner of the square shaft portion of the operation rod and the flat portion of the inner surface of the square hole of the handle is suppressed, and the handle does not rotate with respect to the operation rod.

[0010] The above-mentioned washer with a foot is formed by bending a metal plate into a wedge-shaped foot around the operation rod insertion hole inside the annular portion having the function of a spring washer. In addition, the function of the spring washer in the annular portion is effective in suppressing the loosening of the screw coupling means in combination with the elimination of the play of the handle,
The wedge-shaped foot portion is press-fitted between the square shaft portion of the operation rod and the square hole of the handle by tightening with the screw coupling means, and exhibits an effective wedge function.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A handle fixing mechanism according to an embodiment of the present invention described below is used for fitting a square shaft of an operating rod and a square hole of a handle in various devices such as a valve for manual operation. The present invention can be applied to a case where the operation rod and the handle are connected by insertion and both are fixed by screw connection means. 1 to 3 show an embodiment of the handle fixing mechanism. In this embodiment, an operating rod 1 of a valve to which a handle is attached has a square shaft portion 2 at an end thereof and a male screw portion 3 at a distal end thereof, similarly to a conventional handle fixing mechanism. In the illustrated embodiment, the square shaft 2 has a quadrangular cross section. However, the square shaft 2 may be formed in a polygonal rod shape such as a hexagon. And is connected to the operating rod 1.

On the other hand, the handle 5 has a hub 5 at its center.
a, and the square shaft portion 2 is fitted (freely fitted) into the hub 5a.
A square hole 6 for inserting an operating rod having a shape as shown in FIG. An inclined surface 6a which opens to one end side of the square hole 6 is formed on each inner peripheral surface of the end of the square hole 6, and the inclined surface 6a is formed between the square shaft 6 and the square shaft portion 2 inserted into the square hole 6. A gap is formed between the wedge-shaped feet 7b of the washer 7 with feet.
The inclined surface 6a does not necessarily need to be provided on each inner peripheral surface of the end of the square hole 6, and can be provided, for example, only on one surface or the opposing surface in the square hole 6.

The inclined surface 6a in the square hole 6 is
When the handle fixing mechanism of this embodiment is applied to an existing handle fixing mechanism, the inclined surface 6a is cut into the square hole 6 of the handle by cutting or the like. I just need. In this case, the existing handle often has a certain amount of wear on the inner surface of the square hole, and therefore, the machining of the inclined surface 6a can be performed relatively easily. By additionally using the washer 7 with a foot, the handle fixing mechanism can be easily applied to an existing valve or the like. In the case where a wedge-shaped foot 7b of the washer 7 can be inserted between the square hole 6 and the square shaft 2 inserted into the square hole 6 without providing the inclined surface 6a, It is not necessary to provide the inclined surface 6a.

The washer 7 with a foot used for fixing the handle to the square shaft portion 2 of the operation rod is a dish-shaped annular part 7a having a function of a spring washer and a wedge positioned around the operation rod insertion hole inside the part. And a foot portion 7b formed by pressing a metal plate. The foot portion 7b is formed so that a portion of the operation rod insertion hole in the metal plate is formed around the square shaft portion 2 of the operation rod 1 around the insertion hole. Is formed by bending in the direction along the surface. The gap formed between the angled surface 6a formed in the square hole 6 and the square shaft portion 2 inserted in the square hole 6 is used to fit the wedge-shaped foot 7b of the washer 7 with foot. In a state where the foot 7b is pushed into the gap between the square shaft portion 2 of the operation rod 1 and the square hole 6 of the handle 5, the washer 7 with the foot fitted into the operation rod 1 is squared. Part 2
The handle 5 is attached to the operation rod 1 by tightening with a nut 9 screwed to the male screw portion 3 at the tip of the handle.

The male screw part 3 at the tip of the square shaft part 2 and the nut 9 screwed to the screw part constitute screw connecting means for fixing the handle 5 to the operating rod 1.
As the screw coupling means, a means such as providing a female screw portion at the tip of the operation rod 1 and screwing the handle 5 via the washer 7 with a screw screwed thereto may be used.

The spring washer constituting the annular portion 7a of the footed washer 7 has a structure similar to that of the disc spring washer to facilitate design and manufacture, but additionally employs a structure such as a toothed washer. be able to. In addition, the foot 7b of the washer with a foot is provided.
Is placed cross-shaped cut c ₁ as shown in FIG. 2 in a metal plate, a small hole-shaped cutout portion c ₂ is formed at the tip of each cut c ₁ if necessary, are partitioned by the cut c ₁ These four parts can be formed by bending as shown in FIG. In this case, the shape of the foot portion 7b is a mountain shape as shown in FIG. 1, but a shape suitable for functioning as a wedge, such as a trapezoidal shape by cutting off the top of the mountain shape, is formed. be able to. On the other hand, foot 7
It is preferable that the thickness of “b” has a gradient such that the thickness decreases from the annular portion 7a toward the tip of the foot. Further, it is desirable that this gradient is substantially the same as the gradient of the gap formed between the inclined surface 6a provided in the square hole 6 of the handle and the square shaft portion 2 of the operation rod, and thereby the foot portion 7b The wedge action by the can be made more effective.

The washer 7 with feet can be formed into a predetermined shape and then subjected to a heat treatment such as quenching or tempering as required to have strength. In the drawing, reference numeral 10 denotes an annular name plate having a predetermined strength and hardness and also functioning as a spring receiver.

When the handle 5 is mounted on the tip of the operating rod 1 by the handle fixing mechanism having the above configuration, first, the square hole 6 of the handle 5 is fitted into the square shaft portion 2 of the operating rod 1, and the name is placed on the handle 5. The washer 7 with the foot is placed via the plate 10, and the nut 9 is tightened with the foot 7 b of the washer 7 with the foot pressed into the gap between the inclined surface 6 a of the square hole 6 and the square shaft 2. Handle 5 through this washer 7
Is attached to the operation rod 1. As a result, the annular portion 7a of the washer 7 with foot is compressed between the nut 9 and the hub 5a of the handle 5, and the handle 5 does not rattle, so that the annular portion 7a serves as a spring washer to prevent the nut 9 from loosening. On the other hand, the foot 7b pushed into the gap between the inclined surface 6a of the square hole 6 and the square shaft portion 2 effectively functions as a wedge, and the handle 5 It is firmly fixed without play. Effective for repeated external forces in various directions. By eliminating the backlash of the handle 5 in this way, the wear of the corner of the square shaft portion 2 of the operation rod 1 and the flat portion of the inner surface of the square hole 6 of the handle 5 is suppressed.

FIG. 4 shows another embodiment of the present invention. As in the case of FIG. 1, the square hole 6 of the handle 5 is fitted to the square shaft 2 of the operating rod 1. But
The structure of the washer with foot is different. That is, in the washer 17 with feet in this embodiment, the disc spring in the annular portion 17a is reversely warped, and the outer peripheral edge of the annular portion 17a is pressed against the lower seating surface of the nut 9. In this case, a flat washer may be interposed between the lower bearing surface of the nut 9 and the annular portion 17a. With this configuration, the force of the disc spring in accordance with the tightening force of the nut 9 acts as a loosening stopper for the nut, and at the same time, the wedge-shaped foot portion 17b of the washer 17 with foot is connected to the square shaft of the operating rod 1. Acts in the direction of press-fitting between the portion 2 and the square hole 6 of the handle 5, so that the annular portion 17a not only functions effectively as a spring washer to prevent the nut 9 from loosening, but also the play of the handle 5 is effective. Is suppressed. Other configurations and operations are the same as those of the above embodiment.

In each of the above-described embodiments, the washer 7 with a foot,
Although only 17 is mounted, disc spring washers having the same structure as the annular portions 7a and 17a can be stacked and mounted in addition to the washers with feet. FIGS. 5A and 5B show an example of a combination use of the washer 7 with the foot and the two disc spring washers 18.

As described above, the cross section of the square shaft portion 2 in the above embodiment is not limited to a quadrangle.
For example, when the cross section of the square shaft portion 2 is hexagonal or the like, it is necessary to form a foot portion that protrudes from the annular portion of the washer with a foot in accordance with the hexagonal shape. Alternatively, when the gap for inserting the foot of the washer with the foot is provided only by the inclined surface 6a on the facing surface, it is necessary to provide the foot corresponding to the insertion gap.

[0022]

As described above, according to the present invention, the backlash of the handle is eliminated by the washer with the simple structure, so that the square shaft portion of the operating rod and the inner surface of the square hole of the handle are worn. To prevent the handle from rotating relative to the operation rod due to wear, and to prevent looseness of the screw in the screw coupling means by suppressing the play. Thus, an improved handle fixing mechanism can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part showing one embodiment of the present invention.

FIG. 2 is a plan view of a washer with a foot in the embodiment.

FIG. 3 is a side sectional view of the handle in the embodiment.

FIG. 4 is a side sectional view of a main part according to another embodiment of the present invention.

FIG. 5 is a sectional view of an essential part showing an example of a combined use of a washer with a foot and a disc spring washer.

FIG. 6 is a cross-sectional view of a conventional mechanism for fixing an operating rod and a handle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation stick 2 Square shaft part 3 Male screw part 5 Handle 6 Square hole 7, 17 Washer with foot 7a, 17a Ring part 7b, 17b Foot 9 Nut

Claims (1)

[Claims] 1. A handle fixing mechanism for fitting a square shaft portion of an operation rod of various devices into a square hole of a handle and fixing the handle to the operation rod by a screw connecting means, comprising: an annular portion having a function of a spring washer; A washer with feet formed of a metal plate with a wedge-shaped foot located around the inner operation rod insertion hole, and the foot is formed by attaching the portion of the operation rod insertion hole in the metal plate to the insertion hole. Using a washer that is bent in the direction along the surface of the square shaft portion of the operation rod in the periphery, and with the foot pressed into the gap between the square shaft portion of the operation rod and the square hole of the handle, A handle fixing mechanism using a washer with a foot, wherein the washer with a foot is fitted into the operation rod, and the handle is attached to the operation rod via the washer by the screw coupling means.