JPS5877907A - Bolt and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bolt used when fixing a resin lamp to a vehicle body, and a method for manufacturing the bolt.

Conventional bolts of this type have an oval-shaped t on the head of the bolt as shown in Figure @1, so high rotational torque can be obtained by attaching a resin lamp ((2) 62, but during manufacturing Once the bolt has been formed into a circular shape, it is time-consuming to cut the edges (V-yearing), and it is difficult to install.
Since it can be used in two directions, it can be a hassle to work with. In addition, the mounting process requires many steps and is difficult to install because the resin lamp (Pol) 1-Resin light fixture (draw the mounting hole of your choice; after press-fitting, attach it to the claw) Not only is it bad, but also the elasticity (plasticity) of the resin when applying force to the nail.
Since the bolt is bent beyond its limit, the load is smaller when pulling it out in the direction (arrow H), and there have been accidents where bolts have come loose. Also, attach the bolt to the resin light fixture (C1).

Although a certain waterproofing effect can be obtained from the hole (also known as C), a sufficient waterproofing effect could not be expected.For that reason, the mounting hole was drilled → the diameter of the T bolt was sufficiently reduced. If it is formed too small, the resin lamp (0) may break under the pressure of the bolt or become jammed.

The present invention overcomes the inconveniences and shortcomings of conventional products, and can be attached to resin lamps in one step, and has a high rotational torque and pull-out strength (; waterproofing effect is obtained and the joint area is 21 m thick). It is an object of the present invention to provide a bolt that can be manufactured from a rod in two steps and a method for manufacturing the same.

Hereinafter, an example of implementing the present invention will be explained based on the drawings.

The bolt (1) has a circumferential surface iB (:, flat slit (3)) on its head (2), and a bolt rod (5)≦2 approximately on the bottom surface of jiJIWA#21 from its circumferential end (4). Arc-shaped (
= A recessed portion (6) is formed (2. The peripheral end of the bottom surface portion (41v) is curved inward.

The bolt head (2) is lN3 Figure 1: A solid rod as shown (
7) The header is processed (headed) to form a circle i: a shadow, and its peripheral surface ≦ second flat surface is formed.

Flat sleeve) (31 is the longitudinal direction of the bolt (=formation, pole) Mi! (21v resin lamp),
The rolling molds (9a) (9b) (2) are formed at the same time as the bolt rod (51c screw 10'2).

The circumferential edge (4) of the bottom of the bolt head (2) is designed to hold the resin in place when the bolt end (2) is driven into the resin lamp (81) to obtain high strength. , and the circular shape (
The bolt rod (5) is curved and formed into a roughly serpentine shape in cross-section (2).

The bottom surface C2 of the bolt head (51c) is continuous with the one end (4) to form a concave portion 161 that is substantially arc-shaped (C; 51c to 51c).

Next, the Il manufacturing process will be explained in order of f4v steps.

First, in the first step, a solid rod (7: T header is processed to form a circular bolt head (2) and a bolt rod (51).

A recess (6) is formed in the bottom of this ring and the bolt head W75a1. (See Figures $3 to 4) Rolling molds (9a) (9b) are created in the next process! Using Pol) M part Q) circumference i
ii MjA & 2 is the sleeve) forming part (14a) (14b
) and the flat slit F (31v, bolt rod 60: is the thread forming part α5a) (15b) to form the screw tOv at once. (See Figure 5) At this time, the circumferential edge (4) of the bottom of the bolt head (2) is curved inward as a result of the rolled section of the flat slit opening 1, and has a roughly eagle-shaped opening in the cross-sectional view. A scream is formed. (
(See diagram $6) Also, simultaneous hill-bolt rod (5: C2 is screw 1
G: Rolling ink: Accordingly, a hammer neck portion 0 is formed between the bolt head (21) and the bottom surface.In addition, the circumferential surface SV of the bolt head (21) is slightly widened in advance (jl (": If you form it,
Rolling of the flat slit opening ≦; Accordingly, the peripheral end (4) is further curved inward, and the cross section becomes approximately an eagle-like shape with an undercut shape.

The bolt of the present invention has such a sea, the horse face part C of the bolt head Q):
Flat Ritz ((l formed, bottom part C = 7 peripheral edge 14
) to the bolt rod (51), which is an approximately arc-shaped recess (
6) When you form l, ζ2, the peripheral edge of the bottom part (4)! Since it is curved inward, when the resin lamp is driven into the resin lamp, the Porto Saba II) will cut into the resin lamp 1 more than the flat-faced lamp, resulting in a high rotational torque.

Moreover, since the circumferential edge (4) of the bottom part of the bolt head (2B) is curved inward, the resin does not bite into the bottom part of the bolt head (C: when driving), and the resin does not get stuck in the valley of the flat sleeve) 3). is definitely C
;If you can get a higher rotational torque, you can expect a smoother C drive.

Also, when you drive in the resin light fixture, the peripheral edge 11 of the bolt head ■
At the same time as the resin is bitten, the pushed resin fills the recess (6) and the neck part a1 of the bolt rod (5), providing high pull-out prevention strength. A high waterproof effect can be obtained. In addition, as in the embodiment of Fig. 7, the resin lamp) ζ
Since the protruding protrusion tlv in the form of a ni-ring is provided ≦2, when the resin in that part fills into the hollow part 11 of the bolt rod (5), at the same time 62, the circumferential end (4 ) is filled into the undercut shape part of C;, so that even higher extrusion prevention strength and waterproofing effect can be expected.

Furthermore, C2, the bolt of the present invention (according to = the diameter of the mounting hole 13 of the resin lamp (8) may be larger than the diameter of the bolt rod 6), and as in factor 10, the recess to t: When driving, the inner diameter -C2 may be formed to have the same outer diameter as the bolt head, so the driving load is small and the stress applied to the resin lamp (81c) is small, so the resin lamp (81 is less prone to cracking) than the resin lamp (81c). There is no need to worry about the jamming phenomenon W.

Father, since the bolt of the present invention has a circular head, it can be installed without any directionality, and it can be installed in a resin lamp (81C-) with a single drive, so the installation work is easier compared to conventional products. At the same time, as shown in Fig. 12, the resin lamp is formed with a convex portion Ov. From C2,
The thickness at the time of driving is small, so that it can be installed in small details (small gaps).

According to the manufacturing method of the present invention, it is possible to manufacture a two-step Yavolt, which is simple and inexpensive (2).

Figure 2 is a front view of the bolt of the present invention, Figures 3 to 5 are diagrams showing the manufacturing method for the bolt of the present invention in the order of manufacturing steps (2), and the sixth factor is a sectional view taken along the line (61-(6)). , FIGS. 7 to 9 are Tv# side views showing the order in which the bolt resin lamp of the present invention is installed, and FIGS. , FIG. 12 and FIG. 13 are cross-sectional views showing another embodiment.

-9, (11 is Pol), (21 is the head, (3) is the flat slit, (4) is the peripheral edge, (5) is the bolt rod, (6) is the recess, (7) is the solid bar, ( 81 is a resin lamp, (9a) (
9b) is a rolling die, t.

is a screw, and 0 is a lug l [liI,

jf! Figure 7 Figure 10 Figure 12 Figure 11 13th vIJ

Claims (1)

[Claims] (1) Bolt head circumference flaC second plane) V
The bottom part has two bolt rods C extending from its circumferential edge into a roughly circular arc shape 6: a concave WA! A bolt characterized in that the circumferential edge of the bottom surface portion is curved inwardly with the formation T≦2. Q1 Processing a header of a solid bar to form a bolt head having a bottom part 1: concave IIv, and forming a horse face part 4 of the bolt head with a flat slit i using a rolling die;
A method for manufacturing a bolt, comprising the steps of: curving the peripheral end of the bottom WIAIl inward; and temporarily forming the left side of the bolt rod section after forming two screws.