JP3012744U - Washer with spring washer - Google Patents

Abstract

(57) [Summary] [Purpose] A spring washer fixed to a seat plate so that the spring washer can be moved with respect to the seat plate not only by welding but also in the process of deformation to a flat state when tightened. Provide a washer. [Structure] The seat plate 10 has an inner diameter equal to that of the bolt insertion hole 1 of the seat plate 10, and an outer diameter of the spring washer 2.
The cylindrical portion 2 formed to be slightly smaller than the inner diameter of 0 is provided. Then, a spring washer 20 having a recess 21 formed on the inner periphery thereof is fitted into the tubular portion 2, and the tip portion 2a of the tubular portion 2 is expanded and deformed outward so that the tip portion 2a is recessed. The spring washer 20 is pushed into the inside of the seat 21, and the spring washer 20 is held on the seat plate 10 by the tip 2a. [Effect] When tightening, the spring can be smoothly tightened and the spring property of the spring washer can be sufficiently imparted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a washer with a spring washer in which a spring washer is held on a seat plate.

[0002]

[Prior art]

 Conventionally, when tightening bolts, a washer with a spring washer is used in which a spring washer is held on a seat plate in order to impart elasticity and enable firm tightening.

By the way, in the prior art, a spring washer is placed on a seat plate having a bolt insertion hole, and the spring washer is held by being welded and fixed to the seat plate.

Therefore, with tightening, the spring washer is deformed into a flat state, which makes it difficult to perform smooth tightening, and the spring property of the spring washer is impaired. It was

Further, the weld metal may adhere to the welded portion and project upward from the upper surface of the spring washer. Therefore, the bottom surface of the tightened nut does not come into close contact with the upper surface of the spring washer and rises from the upper surface. There was a problem in terms of quality.

Moreover, not only the welding work is time-consuming and costly, but also the material of the spring washer changes due to heat during welding, proper spring properties cannot be obtained, and the spring washer easily breaks. There was also a problem with durability.

[0007]

This invention was made in order to solve the above-mentioned conventional drawbacks. The purpose of this invention is to flatten the spring washer not by welding but by tightening. The purpose of the present invention is to provide a washer with a spring washer in which the spring washer is fixed to the seat plate so that the spring washer can move with respect to the seat plate in the process of being deformed into the state.

[0008]

[Means for Solving the Problems]

 That is, according to this invention, in order to achieve the above object, the cylindrical portion 2 having an inner diameter equal to the bolt insertion hole 1 of the seat plate 10 and an outer diameter slightly smaller than the inner diameter of the spring washer 20 is provided. A spring washer 20 is provided so as to project from the seat plate 10 coaxially with the bolt insertion hole 1, and a recess 21 is formed in the inner circumference along the circumferential direction. The tip end portion 2a is expanded and deformed outward so that the tip end portion 2a is pushed into the concave portion 21, and the tip end portion 2a holds the spring washer 20 on the seat plate 10. It is a thing.

[0009]

[Work]

 Since the spring washer 20 is configured as described above, the spring washer 20 includes the gap between the outer diameter of the tubular portion 2 protruding from the seat plate 10 and the inner diameter of the spring washer 20, and the tip of the tubular portion 2. Within the range of the gap existing between the portion 2a and the recess 21 of the spring washer 20, it is held on the seat plate 10 so as to be movable vertically and laterally.

Therefore, as the nut is tightened, the spring washer 20 is gradually deformed into a flat state while slightly moving on the seat plate 10 while receiving a force in the rotation direction of the nut.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. A seat plate 10 has a circular bolt insertion hole 1 formed at the center by press working. Although the seat plate 10 is shown as having a square shape in the drawing, it may be formed into a shape suitable for the purpose such as a round shape.

Reference numeral 2 denotes a tubular portion that is provided coaxially with the bolt insertion hole 1 so as to project from the seat plate 10. The inner diameter is formed to be the same as the bolt insertion hole 1, and the outer diameter is fitted to the tubular portion 2. The spring washer 20 has a size slightly smaller than the inner diameter of the spring washer 20. The height of the tubular portion 2 may be set to be approximately the same as or slightly lower than the thickness of the spring washer 20. The tubular portion 2 may be formed by pressing a part of the seat plate 10 into a tubular shape at the same time when the bolt insertion hole 1 is bored by press working.

Reference numeral 20 denotes a spring washer 20 fitted to the tubular portion of the seat plate 10, and has a recess 21 formed along the circumferential direction on the inner periphery thereof. The recess 21 may be formed in the middle of the spring washer 20 in the thickness direction, or may be formed by forming the surface opposite to the seat plate 20 side as a step as shown in FIG. The spring washer 20 may be manufactured by winding a wire rod, which is a material of the spring washer 20, into a ring shape, as in the conventional case. It is preferable that the spring washer 20 having the concave portion 21 on the inner circumference is obtained by forming 21 by press forming and winding and forming the wire into a ring shape.

After the spring washer 20 is fitted into the tubular portion 2, the tip portion 2a of the tubular portion 2 is expanded and deformed outward by press working so that the tip portion 2a becomes a recess 21 of the spring washer 20. I'm pushing it in. When the tip 2a of the tubular portion 2 is pushed into the recess 21, the spring washer 20 cannot be removed from the tubular portion 2.

Since the spring washer 20 is configured as described above, the spring washer 20 includes a gap existing between the outer diameter of the tubular portion 2 protruding from the seat plate 10 and the inner diameter of the spring washer 20, and the tubular portion. It is held on the seat plate 10 so as to be movable in the vertical and horizontal directions within the range of the gap existing between the tip 2a of the second spring 2 and the recess 21 of the spring washer 20.

Therefore, with the tightening of the nut, the spring washer 20 is deformed into a flat state while slightly moving on the seat plate 10 while receiving the force in the rotating direction of the nut.

[0017]

[Effect of device]

 As described above, according to this invention, the spring washer is fitted to the cylindrical portion projecting on the seat plate, and the distal end portion of the cylindrical portion is expanded and deformed outward to deform the distal end portion of the spring washer. Since the spring washer is held on the seat plate by pushing it into the recess on the inner circumference of the seat, the spring washer is not completely fixed to the seat plate as in the case of welding, but can be moved within a small range. It will be fixed in such a state. Therefore, when tightened, the spring washer deforms to a flat state while slightly moving on the seat plate while receiving the force in the rotation direction of the nut, so that the spring washer can be tightened smoothly and the spring property of the spring washer is improved. It is possible to provide a washer with a spring washer that can sufficiently impart

Moreover, since the material is retained by the welding washer due to heat during welding as in the conventional case, the spring washer is likely to be impaired in proper springiness, and the spring washer may be easily broken. There is absolutely no, and therefore a high quality, durable washer with a spring washer can be provided.

Then, each work of expanding and deforming the cylindrical portion projecting on the seat plate, the concave portion provided on the inner circumference of the spring washer, and the tip end portion of the cylindrical portion of the seat plate is performed by press working or press working. Since it can be traced, the workability in manufacturing is improved and mass production is possible compared to the case where the spring washer is fixed to the seat plate by welding, and thus the washer with spring washer is provided at low cost. it can.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention before holding a spring washer on a seat plate.

FIG. 2 is a perspective view showing a state in which a spring washer is fitted in a tubular portion of a seat plate in FIG.

FIG. 3 is a perspective view of a seat plate holding a spring washer in FIG. 2;

FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG.

5 is an enlarged cross-sectional view showing another embodiment of the spring washer at the same position as in FIG.

[Explanation of symbols]

 10 seat plate 1 bolt insertion hole 2 tubular portion 2a tip of tubular portion 20 spring washer 21 recessed portion

Claims (1)

[Scope of utility model registration request] 1. A cylindrical portion 2 having an inner diameter equal to that of the bolt insertion hole 1 of the seat plate 10 and an outer diameter slightly smaller than the inner diameter of the spring washer 20 is seated coaxially with the bolt insertion hole 1. A spring washer 20 protruding from the plate 10 and having a concave portion 21 formed in the inner circumference along the circumferential direction is fitted to the tubular portion 2, and the tip portion 2a of the tubular portion 2 is directed outward. A washer with a spring washer in which the tip portion 2a is pushed into the recess 21 by being expanded and deformed, and the tip portion 2a holds the spring washer 20 on the seat plate 10.