JPH05106627A - Washer fitting method for bolt - Google Patents

Abstract

PURPOSE:To provide a washer fitting method to a bolt to which the washer can be previously fitted even in case of a thick shaft bolt. CONSTITUTION:In a fitting method of a washer 1 to a bolt 2, an umbrella-like washer 1 of which an inserting hole 11 for the shaft part 22 of the bolt 2 is provided on the center part and linear or dotted locking parts 13 are formed on the inner circumferential face of the inserting hole 11 is used, after inserting the shaft part 22 of the bolt into the inserting hole 11 of the washer 1, the umbrella-like washer 1 is worked into a flat plate by pressing so as to bring the locking parts 13 in contact with the surface of the shaft part, and hence the washer 1 is fitted to the shaft part 22.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for attaching a washer to a bolt.

[0002]

2. Description of the Related Art When a washer is attached to a bolt, there is a method of fitting a single washer at the time of assembling the bolt, or a method of previously attaching the washer to the bolt so as not to drop. When attaching a washer in advance, as shown in Fig. 9,
This is a structure in which the threaded portion d is engraved after the ring-shaped washer c is attached to the shaft portion b of the bolt a, and the ridge of the threaded portion d rises and the diameter of the threaded portion d expands. Can be prevented.

[0003]

However, when the washer f is attached to the thick shaft bolt e as shown in FIG. 10, since the shaft portion h has a larger diameter than the screw portion g, the washer f is preliminarily set. Cannot be installed. Therefore, the worker must fit a single washer f for each bolt when assembling the bolts, which is extremely inefficient in work flow in mass production.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a washer mounting method for a bolt, which enables a washer to be preliminarily attached even with a thick shaft bolt. The purpose is to do. That is, according to the present invention, in a method of attaching a washer to a bolt, a hole for inserting a shaft portion of the bolt is opened in a central portion, and a linear or dot-like locking portion is formed on a peripheral portion of the insertion hole. After using the washer to insert the shaft of the bolt into the insertion hole of this washer, press the umbrella-shaped washer to process it into a flat plate, and bring the locking part into contact with the surface of the shaft to form the shaft. It is a method for attaching a washer to a bolt, which is characterized by attaching a washer to the. In addition, in the method of attaching the washer to the bolt, an umbrella-shaped washer having a hole for inserting the shaft of the bolt in the central portion and forming a linear or dot-like locking portion at the peripheral portion of the insertion hole is used. Then, after inserting the shaft part of the bolt into the insertion hole of this washer, press the umbrella-shaped washer to process it into an inverted umbrella shape, bring the locking part into contact with the surface of the shaft part, and wash the shaft part with the washer. It is a method for attaching a washer of a bolt, which is characterized in that

[0005]

Embodiment 1 An embodiment of the present invention will be described in detail below with reference to the drawings. <A> Structure of Washer As shown in FIG. 3, the washer 1 is an umbrella-shaped steel plate having an insertion hole 11 formed in the center for inserting the shaft portion of the bolt. Around the insertion hole 11, a vertical inner peripheral surface 12 as shown in FIG. 4 is formed. The diameter of the inner peripheral surface 12 is slightly larger than the shaft portion 22 of the bolt 2, and is formed so that the shaft portion 22 can be inserted. The ring-shaped portion of the upper edge of the inner peripheral surface 12 is used as the locking portion 13.

<B> Method for Attaching Washer Next, a method for attaching the washer 1 will be described. In addition, as shown in FIG. 1, the bolt 2 described in the case of using a thick shaft bolt as the bolt has a head portion 21, a shaft portion 22, and a shaft portion 2 as shown in FIG.
The screw portion 23 has a diameter smaller than 2. First, as shown in FIG. 4, the shaft portion 22 of the bolt 2 is inserted into the insertion hole 11 of the washer 1.
Penetrate inside. At this time, the locking portion 13 of the washer 1 is fitted so as to be located on the bolt head 21 side. Next, the washer 1 is sandwiched between the bolt head 21 and the die 3,
As shown in, the umbrella-shaped washer 1 is pressed to be processed into a flat plate shape. As a result, as shown in FIGS.
Contacts the surface of the shaft portion 22. Therefore, the locking portion 13 can be lightly supported to the extent that it does not come into line contact with the outer peripheral surface of the shaft portion 22 and bite into the surface of the shaft portion 22. Therefore, the washer 1 can be attached to the shaft portion 22 so as not to fall off. The lock portion of the washer 1 may have a structure in which the shaft portion 22 is partially supported by point contact as shown in FIG. 6 or a structure in which the shaft portion 22 is partially supported by line contact as shown in FIG. 7. Conceivable.

[0007]

Second Embodiment As shown in FIG. 8, when the washer 1 fitted in the bolt 2 is pressed, a die 31 having a recess 32 is formed.
There is also a case where the washer 1 is processed so as to have an inverted umbrella shape. By thus deforming the washer 1 further to the opposite side, the returning force of the washer 1 is reduced, and the washer 1 can be attached in a stable state.

[0008]

Since the present invention is as described above, the following effects can be expected. <A> Conventionally, when attaching a washer to a thick bolt,
Since the shaft portion has a larger diameter than the screw portion, the washer could not be attached in advance. Therefore, the worker has to fit a single washer for each bolt when assembling the bolts, which causes a reduction in work efficiency in the flow work in mass production. On the other hand, according to the present invention, the lock portion of the washer can be lightly supported to the extent that it does not come into line contact with the outer peripheral surface of the shaft portion of the bolt and cut into the surface of the shaft portion. Therefore, the washer can be attached to the shaft portion so as not to fall off. Therefore, the washer can be attached to the shaft portion of the thick shaft bolt in advance, and the conventional complicated work of attaching the washer can be eliminated, and the work efficiency can be improved.

<N> Since the washer is manufactured in the shape of an umbrella and the same axial force as that of the spring washer is generated during assembly, the effect of preventing the loosening of the bolt can be expected, and the bolt shaft portion may be bitten during fastening. Absent.

[Brief description of drawings]

[Figure 1] Cross-section of a washer attached to a bolt

FIG. 2 is a plan view of a washer attached to a bolt.

FIG. 3 is a perspective view of a washer

FIG. 4 is an explanatory diagram of a washer attachment method.

FIG. 5 is an explanatory view of a method for pressing a washer.

FIG. 6 is an explanatory view of another structure of the washer locking portion.

FIG. 7 is an explanatory view of another structure of the washer locking portion.

FIG. 8 is an explanatory diagram of the second embodiment.

FIG. 9 is an explanatory diagram of a conventional technique.

FIG. 10 is an explanatory diagram of a conventional technique.

Claims (2)

[Claims] 1. A method of attaching a washer to a bolt, wherein a hole for inserting a shaft portion of the bolt is formed in a central portion, and a linear or dot-like locking portion is formed on a peripheral portion of the insertion hole. After inserting the shaft of the bolt into the insertion hole of this washer using a washer, press the umbrella-shaped washer to form a flat plate, and bring the locking part into contact with the surface of the shaft. A washer attachment method for bolts, characterized by attaching a washer to the. 2. A method of attaching a washer to a bolt, wherein a hole for inserting a shaft portion of the bolt is formed in a central portion, and a linear or dot-like locking portion is formed on a peripheral portion of the insertion hole. After inserting the shaft of the bolt into the insertion hole of this washer using a washer, press the umbrella-shaped washer to process it into an inverted umbrella shape, bring the locking part into contact with the surface of the shaft, and A washer attachment method for bolts, characterized by attaching a washer to the part.