JPH0630520U - Bolt with washer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a bolt incorporating a washer while maintaining performance such as tightening and support of parts. [Structure] A washer 2 is mounted near the proximal end of the shaft portion 4 of the bolt 1, and at the position closer to the tip end than the mounting portion of the washer 2, the outer periphery of the shaft portion 4 is sheared so that the outer periphery of the shaft portion 4 is The collar 8 was formed, and the washer 2 was enclosed between the collar 8 and the head 3. Therefore, bolt 1
The washer 2 can be attached to the machine without significant processing. Further, in bolting work, problems such as forgetting to attach the washer 2 or mistakenly mounting the washer 2 are eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a washer-attached bolt, and more particularly to a bolt incorporating a washer without deteriorating the performance of supporting the parts of the bolt.

[0002]

[Prior art]

 For example, in the field of machine industry, when screwing a bolt into a bolt tightening portion of various machines, a method of increasing a bolt tightening force by interposing a washer between a bolt head and a screwed portion is often adopted. In order to prevent the user from forgetting to attach the washer when screwing the bolt in, or making a mistake in the direction in which the washer is loaded, there has been proposed a bolt in which a washer or a component corresponding thereto is incorporated in advance.

[0003]

[Problems to be solved by the device]

 However, conventional bolts with built-in washers require more work to build the washer by incorporating unnecessary work into the bolt, or the shaft of the bolt is shaved to maintain the state in which the washer is attached to the bolt. Therefore, there was a problem that the original function of the bolt was to deteriorate the performance of the parts such as coupling of parts and support of parts.

The present invention has been made in view of the above problems, and an object thereof is to provide a bolt incorporating a washer while maintaining performance such as tightening and supporting of parts.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a bolt having a head portion, a shaft portion extending forward from the head portion, and a male screw portion formed at a tip side portion of the shaft portion, and a base end of the shaft portion. A washer is installed in the vicinity, and at the position closer to the tip than the installation part of this washer, the outer periphery of the shaft part is sheared in the axial direction by a die to form a collar extending in the circumferential direction, The gist of the present invention is that the washer is enclosed between the collar and the head to form a washer-attached bolt.

[0006]

[Action]

 With the above structure, a washer is attached to the bolt so as not to fall out. The attachment of this washer is realized by shearing the outer circumference of the bolt shaft to raise it and forming a collar, so that the shaft of the bolt is not greatly deformed and tightened. Function is maintained and bolts are easy to manufacture. Then, by screwing this washer-equipped bolt into the part where the bolt should be tightened, problems such as forgetting to attach the washer and the wrong mounting direction of the washer will be eliminated.

[0007]

【Example】

 1 to 4 are views for explaining an embodiment of a bolt having a washer according to the present invention. Of these, FIG. 1 is a front view showing a state in which a washer is attached to the bolt used in the embodiment, FIG. 2 is a sectional view showing a working state in which the shaft portion of the bolt is sheared after the washer is attached, and FIG. FIG. 4 is a front view of the bolt with the washer attached, and FIG. 4 is a sectional view showing an example of the actual use state of the embodiment.

In FIG. 1, reference numeral 1 is a bolt, and 2 is a washer having a bolt through hole 2a. The bolt 1 has a head portion 3, a shaft portion 4 extending from the head portion 3 toward the front side (in the right direction in FIG. 1), and a male screw portion 5 formed at a tip side portion of the shaft portion 4. Consists of. The diameter of the shaft portion 4 is expanded from the male screw portion 5 to the root portion 6 provided at the base end portion of the shaft portion 4, and by increasing the rigidity of the root portion 6, a bolt is attached to the root portion 6. It is designed to receive the applied load.

The washer 2 is fitted in the bolt 1 formed in such a structure from the tip side of the shaft portion 4 in the direction of arrow S in FIG. The washer 2 is moved to the root portion 6 of the bolt 1, that is, near the base end of the shaft portion 4 and mounted. Next, as shown in FIG. 2, the bolt 1 is inserted from the tip of the shaft portion 4 into a die 7 having a diameter slightly smaller than the diameter of the root portion 6, and the open end of the die 7 is attached to the tip of the root portion 6. To hit. Then, when a force F1 is applied between the bolt 1 and the die 7 in the axial direction of the bolt 1, the die 7 exerts an ironing action on the root portion 6 of the bolt 1, and The tip skin is subjected to shearing, and a small portion in the thickness direction undergoes shear deformation. As a result, at the position closer to the tip than the mounting portion of the washer 2, the outer skin of the root portion 6 bulges outward in the radial direction, forming a collar 8 that extends circumferentially around the outer periphery of the shaft portion 4. The outer diameter of the ridge of the collar 8 is set to be larger than the inner diameter of the bolt through hole 2a of the washer 2. Therefore, the washer 2 is enclosed between the head 3 and the brim 8 of the bolt 1 as shown in FIG. 3, and the bolt with washer of this embodiment is completed.

A state in which an external force acts on the bolt 1 when the washer-equipped bolt 1 having the above configuration is screwed into a bolt tightening portion of a machine or a structure will be described with reference to FIG. Here, for example, the case where the bracket is supported by bolting on the chassis of the automobile is taken as an example. In FIG. 4, reference numeral 10 denotes a chassis which is a part of the vehicle body, into which the bolt 1 is screwed, and 11 denotes a bracket which is attached to the chassis 10 by bolting. A female thread portion 12 is formed on the chassis 10 so as to correspond to the male thread portion 5 of the bolt 1. Further, the bracket 11 has an inner diameter slightly larger than the outer diameter of the root portion 6 of the bolt 1 and is formed with a screw through hole 13 which allows the root portion 6 to be inserted within a tolerance range. . Then, when the bracket 11 is bolted to the chassis 10, the ridges of the collar 8 interfere with the screw holes 13 of the bracket 11, and the bolt 1 moves in the screwing direction while being crushed by the screwing force of the bolt 1. Finally, the mounting of the bracket 11 is completed with the washer 2 sandwiched between the head 3 and the bracket 11.

In such a mounting structure portion of the bracket 11, when an external force F2 as shown in FIG. 4 is applied to the bracket 11, the bolt 1 is attached to the shaft portion 4 at the step of forming the collar 8 described above. Is substantially free from any deformation or processing, it is possible to receive the excess weight input from the bracket 11 at the root portion 6 with a sufficient margin.

As the washer 2, various washers such as a flat washer and a spring washer can be used.

[0013]

[Effect of device]

 As described above, according to the present invention, the washer is mounted near the base end of the shaft of the bolt, and the outer periphery of the shaft is cut off at the position closer to the tip than the mounting part of the washer. Since a collar is formed on the outer periphery of the part and the above washer is enclosed between the collar and the head, the washer can be attached without performing a significant work on the bolt. Further, various effects such as forgetting to attach the washer and mistakenly mounting the washer in the bolt tightening work can be eliminated.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a washer is attached to a bolt used in an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a working state in which the shaft portion of the bolt is sheared after the washer is mounted in the embodiment.

FIG. 3 is a front view of the bolt with the washer attached.

FIG. 4 is a sectional view showing an example of an actual use state of the embodiment.

[Explanation of symbols]

 1 Bolt 2 Washer 3 Head 4 Shaft 5 Male thread 6 Root 7 Die 8 Collar 10 Chassis 11 Bracket

Claims (1)

[Scope of utility model registration request] 1. A head portion, and a shaft portion extending forward from the head portion,
In a bolt having an external thread formed on the tip end side portion of the shaft portion, a washer is attached near the base end of the shaft portion, and at the position closer to the tip end than the attachment portion of the washer, the washer is axially attached to the outer periphery of the shaft portion. A washer-attached bolt, characterized in that a collar extending in the circumferential direction is formed on the outer periphery of the shaft portion by performing a shearing process on the shaft portion, and the washer is enclosed between the collar and the head portion.