JP2016176505A - Washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washer for preventing looseness of a thread fastened at a location where vibration or shock is applied for a long period of time.SOLUTION: An annular washer S has a circular outer circumference and a substantial oblong inner circumference. An inner edge 3 has protrusions 5A, 5B at both edges of shortest distances from the central part. A shape of this washer S is set to have a distance from the protrusion 5A to the protrusion 5B that holds a shank part 9 of a bolt 8. Starting from this shape shows that the protrusions 5A and 5B are pushed wide in a direction where they repel to each other to expand a diameter to be fitted to the shank part 9 of the bolt 8, resulting in that a deformation occurs at an outer edge 2 to form wave-shaped protrusions 7A, 7B. This washer S is fitted to the shank part 9 of the bolt 8 and fastened with a nut 10, the protrusions 7A, 7B of the washer S are pressed by a seat surface 12 of the nut 10 to try to become a flat shape. In this case, the inner circumference of the washer S is shrunk at its inner circumference to show an oblong shape and the protrusions 5A and 5B hold the shank part 9 of the bolt 8 to cause its looseness to be stopped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a washer that prevents loosening of a screw.

  Conventionally, the tightened screw often loosens due to vibration or the like. In order to solve these problems, a spring washer, a toothed washer, or the like was used as the washer applied to the bottom of the nut when the bolt was tightened.

  In addition, Patent Documents 1 to 4 are disclosed.

JP 2012-172768 A JP 2008-281127 A JP 2007-315580 A Japanese Patent Laid-Open No. 2002-39140

However, in the conventional work of attaching the object to be fastened with a washer, even if the loosening of the nut is stopped, the bolt is loosened, which is not sufficient.
Therefore, the problem that forms the basis of the present invention is to provide a washer that is difficult to loosen even if bolts are fixed and vibrations are applied, and further prevents the loosening of material costs and labor costs even in manufacturing. With the goal.

  In the present invention, the means of the present invention taken to solve the above problems are as follows. The first means is a washer applied under the female screw when the male screw is tightened, and the annular washer is substantially oval on the inner periphery and is opposed to the other inner edge located at the shortest distance from the center. The distance between the inner edge of the washer and the distance between which the male screw shaft is clamped is a washer.

According to this, as for the said washer, it is desirable to make the distance of one said inner edge part from a center part, and the other said inner edge part into a symmetrical distance from a center part. In addition, when the distance from one inner edge portion to the other inner edge portion is extended to a distance through which the shaft portion of the male screw passes, the washer has a shape in which the outer edge is undulated while being distorted. When the washer having this shape is fitted to the shaft portion of the male screw and screwed with the female screw, the outer edge of the washer is pressed by the seat surface of the female screw, and tends to change from a corrugated shape to a flat shape. At this time, the washer has a distance between one inner edge portion and the other inner edge portion, the inner circumference is reduced in diameter to become an approximately oval shape, and the male screw is held loose. Will be blocked.

In the second means, the washer is a washer of the first means characterized in that a plurality of protrusions are provided on both the one inner edge and the other inner edge.

According to this, the washer clamps the shaft portion of the male screw between the one projection and the other projection so as to more firmly stop loosening.

In the third means, the washer includes a distance in which the distance between the other inner edge facing the one inner edge passes through the shaft of the male screw and a shape in which the outer edge is undulated. This is a washer for the first and second means.

According to this, the said washer is expanded in the magnitude | size which pushes and expands both the said inner edge parts in the direction which leaves | separates, and fits the inner periphery to the axial part of the said external thread. At this time, both the outer edges of the washer in the direction of the longest distance from the central portion undulate to form a raised portion. Further, it is desirable to add elasticity to this shape.

  When the washer is fitted to the shaft portion of the male screw and tightened with the female screw, both the raised portions are pressed by the seat surface of the female screw, and the inner circumference is reduced in diameter. Thus, the loosening of the male screw is stopped. Further, the looseness of the female screw is stopped by the elastic repulsive force of the washer.

  Since the washer according to the present invention has a simple structure, the manufacturing cost is low, mass production is possible, tightening work can be easily performed, and loosening can be prevented. Also, the screws can be prevented from falling off.

It is the schematic which comprises the whole shaped washer which concerns on this invention. FIG. 2 is an enlarged schematic view of the washer of FIG. 1 according to the present invention. It is a top view of the prototype of the washer which concerns on this invention. It is a top view before shaping of FIG. 2 which concerns on this invention. FIG. 5 is a cross-sectional view of FIG. 4 according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic view of the most general form representing an embodiment of the present invention. The washer S includes an outer edge 2, an inner edge 3, and an inner edge. 3A, 3B, protrusions 5A, 5B, raised portions 7A, 7B, bolts 8, shafts 9, nuts 10, and seat surfaces 12.

The washer S shown in FIGS. 1 and 2 is sized so that the inner edge 3 </ b> A and the inner edge 3 </ b> B of the substantially oval inner edge 3 are pushed away from each other, the inner circumference is expanded, and the shaft 9 of the bolt 8 is fitted. It has been shaped. At this time, the outer edge 2 is distorted and undulated to form a raised portion 7A and a raised portion 7B.

  In the washer S of FIG. 3, the distance from the inner edge portion 3A to the inner edge portion 3B is slightly shorter than the length of the diameter of the shaft portion 9 of the bolt 8 so that the shaft portion 9 of the bolt 8 is sandwiched. Yes.

  The inner edge 3A shown in FIG. 4 is provided with two protrusions 5A, and the inner edge 3B is also provided with two protrusions 5B.

  In the washer S in FIG. 4, the distance from the protruding portion 5 </ b> A to the protruding portion 5 </ b> B is set to a distance for clamping the shaft portion 9 of the bolt 8. The thickness of the washer S shown in FIG. 5 is preferably the same as the pitch length of the shaft portion 9 of the male screw 8.

  For example, when the outer diameter of the shaft portion 9 of the bolt 8 is 10, 0 mm, the washer S to be used has a distance of the protrusions 5A to 5B of 9, 3 mm, and a distance of the inner edge portions 3A to 3B of 13.5 mm, From this shape, it is desirable to shape the distance between the protrusions 5A to 5B to 11.0 mm and the distance between the inner edges 3A to 3B to 11.0 mm, and it is desirable to provide elasticity in this shape.

  As shown in FIG. 1, the embodiment of the present invention will be described. When the washer S is fitted to the shaft portion 9 of the bolt 8 and tightened with the nut 10, the raised portions 7 </ b> A and 7 </ b> B are suppressed by the seat surface 12 of the nut 10. Then, it tries to be a plane having the same height as the thickness of the washer S. At this time, the interval between the projection 5A and the projection 5B of the washer S is narrowed, the inner circumference is reduced in diameter to become a substantially oval shape, and the shaft 9 of the bolt 8 is sandwiched between the projection 5A and the projection 5B. Press to stop loosening. Further, the nut 10 is prevented from loosening due to the resilience of the washer S.

  The present invention is not limited to the above-described embodiments and examples, and various modifications can be made within the scope of the claims.

S washer 2 outer edge
3 Inner edge 3A, 3B Inner edge part 5A, 5B Protrusion part 7A, 7B Raised part 8 Bolt 9 Shaft part 10 Nut 12 Seat surface

Claims (3)

A washer that is placed under the female screw when the male screw is tightened. The annular washer has a substantially oval inner periphery, and extends from one inner edge located at the shortest distance from the center to the other inner edge facing the other. A washer characterized in that the distance includes a distance for clamping the male screw shaft.   The washer according to claim 1, wherein the washer includes a plurality of protrusions on both the one inner edge and the other inner edge.   The said washer was equipped with the distance which the distance of the other inner edge part which opposes from the said one inner edge part passes the axial part of the said external thread, and the shape which the outer edge undulated in the waveform, The 1st aspect is characterized by the above-mentioned. 2. A washer according to 2.