JPH0874831A - Spring washer - Google Patents

Abstract

PURPOSE: To improve locking effect of a screw by press-molding a plurality of shallow grooves spirally from a center of a washer, on one side of the washer having a hole for penetrating a bolt or a screw at a center. CONSTITUTION: In a spring washer used together with screw parts for fastening, a plurality of, for instance three grooves 2 are press-molded on one surface of a thin ring-like spring washer main body 1, spirally with even distribution in a circumferential direction. An upper surface flat portion 3 whose center is slightly highered is prepared between the grooves 2. In usage, screw parts are fastened thightly unter the state that a lower surface of the spring washer main body 1 is in substantially even contact with a surface of an object to be fastened over the circumference. In the washer, flexture is generated at the shallow spiral groove 2. Simultaneously, spring repulsion is generated over the circumference. Locking effect of the screw parts is obtained even when oscillative external force is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring washer used together with a screw part for fastening.

[0002]

2. Description of the Related Art As a conventional spring washer, a coil washer having a rectangular cross section is wound once, and the spring washer is cut diagonally at one place, or a ring-shaped countersunk spring having a medium height like a dish. Or, a washer having a large number of teeth formed on the inner or outer circumference of a flat washer or a flat washer has been mainly used.

[0003]

The spring washer, which has been most widely used in the past, is useful for increasing the frictional force between the screw surfaces of bolts and nuts used for fastening together, but it does not cause vibration. When an external force is applied, a slip occurs between the bolt and the bearing surface of the nut, and the bolt or nut easily loosens. The loose spring washer and the toothed washer are almost unchanged at the point where the loosening occurs. Therefore, although these washers are effective for use in preventing the nuts or bolts from falling off, they are hardly effective as vibration countermeasures. An object of the present invention is to provide a spring washer that has a simple shape that is not much different from a plain washer and that does not easily loosen the bolts and nuts used with it even when an external force accompanied by vibration is received.

[0004]

In the present invention, a plurality of shallow grooves are radially formed by pressing on one surface or both upper and lower surfaces of a widely used flat washer and a square washer from the center of the washer. As a result, the flat portion between the grooves is slightly raised, and when viewed from the side, the corrugation is slightly formed evenly over the entire circumference of the spring washer. At this time, the flat part around the protrusion provided on the mold for forming the groove directly hits the flat part of the washer which is the material to prevent the protrusion from being obstructed, so that a hard material such as hard rubber is used. The groove is compressed and formed so as to hit through the elastic body.

[0005]

When the spring washer of the present invention is tightly tightened by the threaded parts, the radial shallow grooves, like the tread (tread) of the automobile tire, tend to slip and rotate the washers of the bolts or nuts in contact with each other. Increase the frictional resistance of time.

Furthermore, when the radial groove is compression-molded by a press, the flat portion between the grooves receives the lateral force of the material and slightly rises and bulges near its center. The bump is larger near the inner circumference of the central hole. Therefore, when this washer is strongly tightened by the screw, a spring reaction force is generated like a corrugated leaf spring. Since the radial shallow groove has a thin washer at that location, it is easily bent when subjected to a tightening force, so it has the function of absorbing and also accumulating the energy of the external force acting on the screw. . Therefore, even if a vibrating external force is applied, the influence can be suppressed to a low level. In other words, the spring washer of the present invention has the function of preventing loosening.

[0007]

Embodiments Embodiments will be described below with reference to the drawings. FIG. 1 is a perspective view of an embodiment of the present invention. A thin ring-shaped spring, which is the same as an ordinary plain washer. On one side of the washer body 1, three upper surface grooves 2 are radially formed by pressing,
Moreover, the ring is equally divided into three parts and compression molded. At that time, at the same time, an upper surface flat portion 3 having a slightly raised portion near the center is formed in the middle of each upper surface groove 2.

FIG. 2 shows that the spring washer body 1 shown in FIG. 1 is placed on the surface 5 of the tightening member, and when these are lightly tightened with the bolt washers 4 from above, the contact state of each part is linearly developed. It is the explanatory view shown. Top flat part 3
The ridge near the center of is exaggerated. The lower surface of the spring washer main body 1 is in contact with the surface 5 of the tightening member almost evenly, but the upper surface is the upper surface groove 2.
Is in contact with the bolt seat surface 4 in the vicinity of the center of the flat upper surface portion 3 that is raised when compression molded. When a tightening force F is further applied to the bolt in this state, the vicinity of the upper groove 2 is bent according to the strength, and a spring reaction force R is generated on the lower surface of the spring washer body 1.

FIG. 3 shows an embodiment in which the spring washer body 1 is provided with radially shallow grooves on both upper and lower surfaces thereof. In this case, in order to obtain a larger spring reaction force, the lower surface groove 6 is provided at an intermediate position of the upper surface groove 2. Therefore, when viewed from the side, it can be seen that the wavy warp is formed over the entire circumference on both the upper surface and the lower surface of the spring washer body 1 with a phase shift of 60 degrees.

FIG. 4 is a perspective view of an embodiment in which the shape of the spring washer body 1 is a thin quadrangle like a square washer. In this embodiment, the upper surface groove 2 is radially 4
The book is compression molded by pressing. In this case as well, the vicinity of the center of the upper surface flat portion 3 is slightly raised to form a raised portion, and when the raised portion is tightened by a screw, a spring reaction force is generated and a slack preventing function is exerted. Since the spring washer main body 1 has a quadrangular shape, slip rotation does not easily occur even if a groove is not provided on the lower surface thereof, and anti-rotation measures are easily taken. Therefore, this example is for building buildings, bridges,
Alternatively, it is most effectively used for screw parts that receive a load accompanied by vibration in railway facilities.

[0011]

Since the present invention is constructed as described above, the following effects can be obtained.

When the spring washer of the present invention is tightly tightened with a screw part, the shallow radial grooves provided on the upper surface or both upper and lower surfaces of the spring washer are bent, and at the same time, the spring reaction force is uniformly generated over the entire circumference. Therefore, even if a vibrational external force is applied, the effect of preventing loosening of the screw component can be obtained. Further, since the radial groove increases the frictional force between the threaded components that are in contact with each other and acts to prevent the sliding rotation, the effect of preventing the loosening of the screw is further enhanced in combination with the spring reaction force.

Since the spring washer of the present invention is simpler and flatter in shape than other forms of spring washer, it is easy to manufacture and is low in cost. There is no fear of damaging the contact surface of the mating parts, and the usage is simple. Furthermore, it has a wide range of uses because it also has the effect of a flat washer, that is, the effect of preventing depression of the screw and providing a pressure receiving surface with high finishing accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment in which a plurality of grooves are radially provided on an upper surface of a ring-shaped main body.

FIG. 2 is an explanatory diagram in which a contact state when the main body shown in FIG. 1 is tightened with a tightening member with a bolt is linearly developed.

[FIG. 3] A plurality of radially arranged upper and lower surfaces of a ring-shaped body,
It is a perspective view of one example which provided a groove.

FIG. 4 is a perspective view showing an embodiment in which a plurality of grooves are radially provided on the upper surface of a rectangular main body.

[Explanation of symbols]

1 ... Spring washer body 2 ...
・ Top groove 3 ・ ・ ・ Top flat part 4 ・ ・
・ Bolt seat surface 5 ・ ・ ・ Tightening member surface 6 ・ ・
・ Lower surface groove 7 ・ ・ ・ Lower surface flat part

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[Procedure amendment]

[Submission date] November 30, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

SUMMARY OF THE INVENTION The present invention has a plurality of shallow washers, which are widely used in the past, formed on one side or both sides of a flat washer and a square washer so as to radially divide the washers evenly from the center of the washer.
A trough-shaped groove was compression-molded by a press. As a result, the flat portion between the grooves is slightly raised, and when viewed from the side, the corrugation is slightly formed evenly over the entire circumference of the spring washer. At this time, the central part of the flat part
The height of the raised portion is about 15% of the material thickness, and the gutter-shaped groove
With a mold so that the depth of the material is about 25% of the material thickness
It is desirable to

Claims (2)

[Claims] 1. A spring washer in which a plurality of shallow grooves radially formed from the center of the washer are compression-molded by a press on one surface of a washer having a hole for passing a bolt or a screw in the center. 2. The spring washer according to claim 1, wherein a plurality of shallow grooves are provided on both upper and lower surfaces of the washer.