JPH09236108A - bolt - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a bolt having excellent sealing properties, locking and vibration-proofing properties. SOLUTION: An annular groove 4 is formed on a seat surface portion of a flange portion 3 provided on a bolt head 2 of a bolt main body 1 having a tightening amount regulating function, and unevenness 5 is formed on an inner bottom surface of the annular groove 4. Concavities and convexities 8 are formed on the outer peripheral surface of the lower portion of the neck of the bolt shaft portion 7, and the elastic seal body 6 having the tapered taper surface 6a is integrally formed from the annular groove 4 to the lower portion of the neck.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt having excellent sealing properties, locking and vibration-proofing effect.

[0002]

2. Description of the Related Art Conventionally, a bolt having a sealing property, an anti-loosening property and a vibration-proofing effect is as shown in FIG.
In addition to forming a receiving collar portion 10a for restricting the tightening amount at a substantially intermediate portion of the bolt shaft portion 10 of the flanged bolt, the bolt shaft portion 10
Through a bolt-shaped washer 12 whose upper surface is affixed to the seating surface 11 through the bolt shaft portion 10.
3 is fitted, and when the tapered taper surface 14 of the elastic seal body 13 is pressure-bonded to the chamfered portion C of the member W to be fastened, a male screw is formed so that the receiving collar 10a contacts the stepped portion L of the substrate B. It is known to screw 15 onto the substrate B. However, in order to insert the washer 12 into the bolt shaft portion 10, it is necessary to provide the washer 12 with a central hole 12a through which the receiving collar portion 10a can be passed, and the elastic seal body 13 can easily receive the receiving collar portion 10a. The center hole 13a is slightly larger than the bolt shaft portion 10 so that it can pass therethrough. For this reason,
The elastic seal body 13, which is compressed by tightening the bolt, enters the gap between the bolt shaft portion 10 and the central hole 12a and is deformed, and the tapered surface 14 does not come into close contact with the chamfered portion C of the member to be fastened W accurately, and the seal is formed. There was a problem that the anti-loosening property, the anti-loosening property and the anti-vibration effect were impaired.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bolt having excellent sealing properties, locking and vibration damping properties.

[0004]

In order to achieve the above-mentioned object, an annular groove is formed in a bearing surface portion of a flange portion provided on a bolt head mainly composed of a bolt having a tightening amount regulating function. In addition to forming unevenness on the bottom surface, unevenness is formed on the outer peripheral surface of the neck portion of the bolt shaft portion, and an elastic seal body having a tapered taper surface is molded and integrated from the annular groove to the lower portion of the neck. According to the invention of claim 1,
In the invention of claim 1, a bolt having the lower end surface of the skirt portion formed on the outer periphery of the flange portion as the abutment surface for regulating the tightening amount is defined as the invention of claim 2, and in the invention of claim 1, the bolt shaft portion The invention according to claim 2 is a bolt having a receiving collar portion for tightening amount regulation formed substantially in the middle thereof.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A first preferred embodiment of the present invention will be described with reference to FIGS. 1 to 3. Reference numeral 1 is a bolt main body having a tightening amount regulation function, and the bolt main body 1 is a bolt. A flange portion 3 is formed at the lower end of the head portion 2. As shown in FIG. 2, an annular groove 4 is formed on the bearing surface of the flange portion 3, and an inner bottom surface of the annular groove 4 is provided with an uneven surface 5 having a sawtooth cross section as shown in FIG. Is formed in. Further, the skirt portion 3a formed on the outer periphery of the flange portion 3 has its lower end surface 3b as the abutting surface to the member to be fastened W.
Prevents the bolt main body 1 from being tightened more than necessary,
The elastic seal body 6 described later is prevented from being crushed and deformed. Reference numeral 6 denotes a tapered elastic seal body. The elastic seal body 6 forms a tapered surface 6a that abuts the chamfered portion C of the member W to be fastened, and is fitted into the hole H of the member W to be fastened. A straight cylinder portion 6b is formed, and the elastic seal body 6 is integrally molded by insert molding so that the upper end portion is fixed to the annular groove 4 and the bolt shaft portion 7 is fixed. 8 is, as shown in FIG. 2 and FIG.
A concave and convex portion having a saw-tooth cross section is formed on the lower part of the neck of the bolt shaft portion 7, that is, on the outer peripheral surface at the position where the elastic seal body 6 is fixed. It is firmly fixed to prevent rotation. Reference numeral 9 is a threaded portion formed at the tip of the bolt shaft portion 7.

The structure thus constructed is such that a substrate B having a screw hole S and a hole G having a diameter larger than that of the screw hole S is provided with a hole H having the same diameter as the hole G. After attaching the attached member W, the bolt shank 7 of the bolt main body 1 is fitted and screwed into the screw hole S.
If the threaded portion 9 is screwed into the tapered surface 6 of the elastic seal body 6,
The a comes into contact with the chamfered portion C of the member to be fastened W, and the straight tube portion 6b is fitted into the hole H of the member to be fastened W. At the time of tightening, a torsional force is applied to the elastic seal body 6 that comes into contact with the chamfered portion C of the tightened member W, but the elastic seal body 6 is strongly rotated by the unevenness 5 of the annular groove 4 and the unevenness 8 of the bolt shaft portion 7. Since it is fixed by being fixed, the elastic seal body 6 does not peel off from the annular groove 4 and the bolt shaft portion 7 and largely deform. Further, when the lower end surface 3b of the skirt portion 3a of the flange portion 3 comes into contact with the upper surface of the member to be tightened W, the screw insertion is completed, so that the elastic seal member 6 is chamfered C of the member to be tightened W. Further, the bolt main body 1 is firmly adhered without forming a gap between the bolt main body 1 and the bolt shaft portion 7, and the bolt main body 1 fixes the tightened member W to the substrate B in a watertight manner.

In the second preferred embodiment of the present invention shown in FIG. 4, a receiving collar 7a is provided at an intermediate portion of the bolt shaft portion 7.
When the bolt is formed, the receiving collar portion 7a is locked to the step portion L between the screw hole S and the hole G of the board B so that the bolt main body 1 is not tightened more than necessary, and an elastic seal is formed. Except for the difference from the first preferred embodiment, the body 6 is prevented from being crushed and deformed, and the skirt portion 3a of the flange portion 3 is prevented from coming into contact with the upper surface of the member W to be fastened. Since they have the same structure, the same reference numerals are given and the description thereof is omitted.

[0008]

As apparent from the above description, the present invention provides:
Since the elastic seal body is integrally molded mainly on the bolt through the unevenness of the annular groove and the unevenness of the bolt shaft portion, the elastic seal body does not peel and deform when tightening the screw, and the sealing property and the looseness are surely achieved. It will have the effect of stopping and damping. Further, since the elastic seal body is also closely fixed to the bolt shaft portion, it is possible to reliably prevent water from entering from the bolt shaft portion. Further, unlike the conventional case, since it is not necessary to hold the elastic seal body by a separate washer, the assembling work can be simplified and the mass production can be carried out at a low cost. There is no need to form a central hole in the washer that is larger than the receiving flange of the bolt shaft, unlike when inserting and inserting, so there is no gap between the elastic seal and the bolt main body, and the elastic seal deforms when tightening. Since it does not occur, it has various advantages such as great sealing property, anti-loosening effect, and great vibration damping effect. Therefore, the present invention greatly contributes to the development of the industry as a bolt that solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing a first preferred embodiment of the present invention.

FIG. 2 is a front view of a bolt main body used in the first preferred embodiment of the present invention.

FIG. 3 is a bottom view of the bolt main body used in the first preferred embodiment of the present invention.

FIG. 4 is a partially cutaway sectional view showing a second preferred embodiment of the present invention.

FIG. 5 is a partially cutaway sectional view showing a conventional example.

[Explanation of symbols]

 1 Bolt Main 2 Bolt Head 3 Flange 3a Skirt 4 Annular Groove 5 Uneven 6 Elastic Seal 6a Tapered Surface 7 Bolt Shaft 7a Receiving Collar 8 Uneven

Claims (3)

[Claims] 1. An annular groove is formed on a bearing surface portion of a flange portion provided on a bolt head mainly having a tightening amount regulating function, and an unevenness is formed on an inner bottom surface of the annular groove, and a neck of a bolt shaft portion is formed. A bolt characterized in that unevenness is formed on the outer peripheral surface of the lower portion, and an elastic seal body having a tapered surface extending from the annular groove to the lower portion of the neck is integrally formed. 2. The bolt according to claim 1, wherein the lower end surface of the skirt portion formed on the outer periphery of the flange portion is the abutment surface for regulating the tightening amount. 3. The bolt according to claim 1, wherein a receiving flange portion for restricting a tightening amount is formed substantially in the middle of the bolt shaft portion.