JP2006105382A - Washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washer capable of allowing a user to visually confirm whether a screw is completely fastened or not when the screw is fastened, and further to confirm whether fastening axial force is sufficiently introduced or not. <P>SOLUTION: A projecting knob 3 projecting from a washer main body 1 and positioned in the middle of a projecting claw portion 2, is brought into contact with a fastened member face 11, the more the screw is fastened, the more the projecting claw portion 2 projects from the washer main body 1, so that the projecting claw portion 2 starts its plastic deformation at a thinned base portion to be bent upward and turned over. The more the screw is fastened, the higher a tip 4 of the projecting claw goes up, and the tip 4 of projecting claw is deformed and bent upward to a visually confirmable degree in a state that the screw is completely fastened. In this state, the complete fastening of the screw can be confirmed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a washer.

  Conventionally, bolts and nuts have been widely used for joining members in steel structures. This tightening with bolts and nuts sometimes forgot to tighten.

  As a method for confirming the completion of such fastening work, for example, as disclosed in Japanese Patent Publication No. 6-70441, a head (nut) and a spring washer (spring) provided under the head are used. When the periphery of the washer) is covered with a film, and the fastening part (nut with spring washer) in the state where the portion of the surface of the film covering the head is covered with the film is finally tightened When the washer is deformed into a state of being expanded by the pressing force on the lower surface of the head of the fixing tool, the film is shifted to the outside, and when the fastening operation is completed, it is confirmed that the fastening operation is completed by peeling off the film. It is known that it can be done.

JP 6-70441 JP-A-9-72325

  In the conventional screw tightening method, it is difficult to easily determine visually that the screw has been tightened. Moreover, even if it exists, it was difficult to discriminate | determine whether the axial force was fully introduce | transduced after tightening.

  The present invention is intended to solve the problem that was limited in this conventional technology, and at the same time, it can be determined that tightening is performed, and at the same time, a technology that can be used as a guideline to determine how much tightening axial force is introduced. The purpose is to do.

  In order to achieve the above-mentioned object, the present invention is provided with a mechanism having a protruding portion that is plastically deformed by a tightening axial force at the outer edge of the washer.

  The convex part located at the lower part of the outer edge tongue of the washer is pushed, and a force to push and bend the upper part works.In the initial stage, the outer edge tongue is tightened until a certain amount of force is applied. Withstand axial force. As it tightens, the force increases and when the limit is exceeded, the outer tongue begins to plastically deform. That is, it has a structure in which the magnitude of the tightening axial force can be set by giving a bending strength corresponding to a certain axial force.

  When plastic deformation starts, the collar portion protruding from the outer edge tongue-shaped portion to the periphery is rapidly inverted upward.

  As described above, when the screw is tightened, the washer according to the present invention not only visually confirms whether the screw is completely tightened but also knows whether the tightening axial force is sufficiently introduced. .

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a washer body. A protruding claw portion 2 is disposed around the washer body 1, and the protruding claw portion 2 has a protruding claw tip 4 at the end thereof. Is arranged. The protruding hump 3 is provided so as to protrude from the lower surface of the washer.

  In FIG. 4, the left half portion of the drawing is a state before the nut 5 is tightened, and the right half portion is a view showing a state where the tightening is completed.

  The operation of the above configuration will be described below. The protruding nail 2 that protrudes from the washer body 1 as the protruding hump 3 that protrudes from the washer main body 1 is located in the middle of the protruding nail 2 comes into contact with the fastened member surface 11 and tightens the screw. However, in the figure, at the narrow base, it begins to plastically deform, bends upward, and reverses.

  As the tightening of the screw proceeds, the protruding claw tip 4 rises upward. In a state where the screw is completely tightened, the protruding claw tip 4 is deformed so as to be visually recognized, and the upward direction. bent. In this state, it can be confirmed that the screw is completely tightened.

  The perspective view which understands the washer whole shape of this invention   Top view of the washer   Cross section of the washer   Operational illustration of the washer

Explanation of symbols

1 Washer body 2 Protruding claw part 3 Protruding hump 4 Protruding tip part 5 Nut 6 Bolt 7 Fastened member 8 Bolt hole 9 Nut (after completion of fastening)
10 Washer body (after completion of fastening)
11 Fastened member surface

Claims (2)

  A washer having a structure in which the protruding claw provided on the outer tongue portion of the washer receives a bending load as the screw is tightened, and is turned upward so that it can be seen that it has been tightened. A washer with a convex ledge provided on the protruding nail.

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