JP3176402U - Retaining washer for bolt - Google Patents

Abstract

[PROBLEMS] To provide a bolt washer that prevents the washer from falling off from a bolt and improves the work efficiency by actively holding the washer on the seat surface of the bolt head. To do.
As a bolt retaining washer 1 mounted on a shaft portion 2b immediately below a head portion 2a of a bolt 2, a through hole 1a into which the shaft portion 2b of the bolt 2 can be inserted into the washer 1 and a thickness of the through hole 1a A thin inner hole portion 2d having a diameter larger than the outer periphery of the shaft portion 2b of the bolt 2 protruding inward through the rounded portion at the intermediate portion in the vertical direction, and a bolt with an equal interval between the inner peripheral portion of the thin inner hole portion 2d And a plurality of thin-walled engagement pieces for retaining to protrude inward and having the same diameter as the outer periphery of the shaft portion 2b.
[Selection] Figure 3

Description

  The present invention relates to a bolt washer that prevents the washer from falling off the bolt.

  Generally, when bolting a plurality of members using a washer, a washer having an inner diameter larger than the outer diameter of the bolt is used. As a result, the washer is free to move in the axial direction with respect to the bolt when it is passed through the bolt.

  By the way, when performing the bolt tightening operation using the washer and the bolt having the above-described structure, first, the washer is passed through the bolt, and then the shaft portion of the bolt is inserted and screwed into a plurality of members in that state. Bolts are tightened. However, when performing this bolt tightening operation, the washer is free to move in the axial direction with respect to the bolt. There is a case where it is difficult to perform the bolting operation due to being caught in a tendency in the tip side, and if such a problem occurs, there is a problem that the efficiency of the bolting operation is remarkably lowered.

  Therefore, the present invention prevents the washer from coming off from the bolt in the bolt tightening operation, and can positively hold the washer on the seating surface of the bolt head to improve the work efficiency. The issue is to provide a washer.

  In order to solve the above-mentioned problem, the invention described in claim 1 of the present application is a washer 1 attached to a shaft portion 2b immediately below the head portion 2a of the bolt 2, and the washer 1 is a shaft portion 2b of the bolt 2. A through-hole 1a that can be inserted, and a thin-walled inner-hole portion 2d that is larger in diameter than the outer periphery of the shaft portion 2b of the bolt 2 that protrudes inwardly through the rounded portions 1b and 1c to the middle portion in the thickness direction of the through-hole 1a, A plurality of retaining thin engagement pieces 2e... 2e that protrudes inward and has the same diameter as the outer periphery of the shaft 2b of the bolt 2 at equal intervals on the inner periphery of the thin inner hole 2d. It is characterized by.

  According to the bolt retaining washer 1 of the present invention, since the inner diameter of the retaining thin engagement piece 1e... 1e is substantially the same as the outer diameter of the shaft 2b of the bolt 2, as described above, the thin engagement piece 1e. ... 1e is slid along the shaft 2b (thread 2c) of the bolt 2, or the thin engaging piece 1e ... 1e having an inner diameter set slightly smaller than the outer diameter of the thread 2c is a thin piece. The washer 1 can be moved to the seat surface of the head 2a of the bolt 2 by rotating it slightly in accordance with the pitch of the screw thread 2c using the screw 2c. Moreover, the washer 1 can be moved to the shaft portion 2b of the bolt 2. If necessary, the thin engagement piece 1e... 1e is directly below the bearing surface of the head 2a of the bolt 2 by reducing the tip end portion of the thin engagement piece 1e as necessary and making it slightly smaller than the outer diameter of the thread 2c. The washer 1 is in contact with the thread 2c Can restrain the movement of the second axis direction and the washer 1 can pose well positioned and held on the lower surface of the bolt 2 the head 2a. Therefore, the washer 1 once set to the bolt 2 is not accidentally dropped from the bolt 2 and lost, and the washer 1 is displaced from the seat surface of the head 2a of the bolt 2 even in the bolting operation. Alternatively, the bolt with the washer can be easily handled without falling off from the bolt 2, and the working efficiency can be remarkably improved.

It is a front view of the retaining washer for bolts concerning the present invention. It is the longitudinal cross-sectional view. It is a partially cutaway sectional view of a bolt with a washer. It is a front view of another washer.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show an embodiment of the present invention, in which reference numeral 1 denotes a bolt retaining washer. This washer 1 is a thick flat washer, and has a through hole 1a through which a shaft 2b of a bolt 2 described later can be inserted at the center. A thin hole having a larger diameter than the outer periphery of the shaft portion 2b of the bolt 2 that protrudes inward and concentrically with the through hole 1a through the rounded portions 1b and 1c on the inner surface of the through hole 1a via the rounded portions 1b and 1c. A plurality of (three in the figure) projecting inwardly with the same diameter as the outer periphery of the shaft portion 2b of the bolt 2 at equal intervals on the inner peripheral surface of the thin small hole portion 1d. The thin-walled engagement pieces 1e... 1e for retaining are projecting integrally.

  And the washer 1 formed as described above is consistently formed from a single rod-shaped material made of an expensive metal material such as stainless steel, aluminum alloy, copper, titanium, etc., using a multistage cold forging machine. In the cold forging step, the through hole 1a, the rounded portions 1b and 1c, the thin small hole portion 1d, and the thin engaging pieces 1e... 1e are formed simultaneously and integrally, and the material is not wasted. Is done. Specifically, a rod-shaped material is first forged in a first forging process so that it has a disk shape that matches the shape of a flat washer that the tip of the rod is required. The center part is punched out so as to push it back in the axial direction of the rod-shaped material to form an annular body having a through-hole 2a, and then the round parts 2b and 2c, thin-walled holes around the through-hole 2a of the annular body in the third forging step The portion 2d and the thin engagement pieces 2e ... 2e are integrally formed by forging. Accordingly, the above-described washer can be easily formed by forging in a series of forging steps with a small amount of expensive metal material, and can be manufactured at low cost.

  On the other hand, the bolt 2 has a head portion 2a and a shaft portion 2b as shown in FIG. 3, and a screw 2c is formed on the outer periphery of the shaft portion 2b, so that the shaft just below the seat surface of the head portion 2a of the bolt 2 is formed. The washer 1 is inserted and held on the outer periphery of the portion 2b. The head 2a of the bolt 2 has a cylindrical shape and a hexagonal hole 2d is formed at the center of the upper surface.

  Next, the operation of the washer 1 configured as described above will be described.

  First, the washer 1 is passed through the shaft portion 2 b of the bolt 2. At this time, since the inner diameter of the thin engagement pieces 1e... 1e for retaining is substantially the same as the outer diameter of the shaft 2b of the bolt 2, the thin engagement pieces 1e. ) Or by rotating the thin engaging pieces 2e... 2e in accordance with the twist direction of the screw thread 2c, the washer 1 is moved to the seat surface of the head 2a of the bolt 2. At this time, for example, when inserting the thin engagement pieces 1e... 1e by sliding along the shaft portion 2b (thread 2c) of the bolt 2, the inner diameter portion of the thin engagement piece 1e ( The tip part) is reduced to a little smaller than the outer diameter of the thread 2c. At this time, since the thin engaging piece 1e is a thin piece, the caulking can be easily and easily performed. When the thin engagement pieces 2e... 2e are rotated and inserted in accordance with the twist direction of the thread 2c, the inner diameter of the thin engagement pieces 1e... 1e of the washer 1 is slightly smaller than the thread 2c of the bolt 2. The thin engaging piece 1e... 1e is slightly shifted in accordance with the pitch of the thread 2c and rotated using the thin piece to reach the seating surface of the head 2a. As a result, as shown in FIG. 3, the thin engaging pieces 1e... 1e come into contact with the outer periphery of the screw thread 2c immediately below the bearing surface of the head 2a of the bolt 2 to restrain the washer 1 from moving in the axial direction of the bolt 2. And As a result, the washer 1 is positioned and held on the lower surface of the head 2a of the bolt 2 with a good posture.

  Therefore, the washer 1 once set to the bolt 2 is not accidentally dropped from the bolt 2 and lost. Further, even in the bolting operation, the washer 1 is not displaced from the seating surface of the head 2a of the bolt 2, or is not detached from the bolt 2, so that the bolt with the washer can be easily handled and the work efficiency can be remarkably improved.

  In the above-described embodiment, the plain washer has been described. However, the present invention is not limited to the plain washer, and can be widely applied to, for example, a dish washer having an appropriate thickness. Moreover, although the thing provided with the head of the hexagonal hole 2d was demonstrated as the volt | bolt 2, it is not limited to such a head shape at all, For example, a hexagon head bolt may be sufficient.

  Furthermore, the tip shape of the thin engagement pieces 1e... 1e may be a trapezoidal shape as shown in FIG. Further, the number of the thin engagement pieces 1e... 1e is not limited to three, and may be plural.

DESCRIPTION OF SYMBOLS 1 Washer 1a Through-hole 1b Round part 1c Round part 1d Thin wall small hole part 1e ... 1e Thin wall engagement piece 2 Bolt 2b Head part 2c Shaft part

Claims (1)

A bolt washer 1 attached to a shaft portion 2b immediately below the head portion 2a of the bolt 2, wherein the washer 1 has a through hole 1a through which the shaft portion 2b of the bolt 2 can be inserted, and the thickness of the through hole 1a. A thin inner hole portion 2d having a diameter larger than the outer periphery of the shaft portion 2b of the bolt 2 protruding inward via the rounded portions 1b and 1c at the middle portion in the direction and an inner peripheral portion of the thin inner hole portion 2d are equidistant. And a plurality of retaining thin engagement pieces 2e... 2e projecting inward and having substantially the same diameter as the outer periphery of the shaft 2b of the bolt 2, and a retaining cap washer for bolts.

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