JPH1137132A - Bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability while maintaining waterproof function by providing a disc-like flange part at the hexagonal part lower face of a hexagon head bolt, cutting a ring-shape groove in a flange face on the opposite side to the hexagonal part, and putting an O-ring in this groove. SOLUTION: A cylindrical hole with a depth t8 is provided in a flange 8, and a spring washer 9 and a flat washer 10 are fitted therein. In case of the thickness of the spring washer 9 being t9 and the thickness of the flat washer being t10, it is so constituted as to be t9+t10>t8. An O-ring 11 is fitted into the lower face of the flange 8. In the completely fastened state of a hexagon head bolt 7, in case the distance between the surface of a cover 3 and the lower face groove bottom face of the flange 8 for fitting the O-ring 11 is H, and a sectional diameter in the state of external force not being applied to the O-ring 11 is D, the O-ring 11 is compressed by D>H, and fastening can be performed while preventing the infiltration of water, dust, and the like from a bolt part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fastening bolt,
In particular, the present invention relates to a bolt suitable for a fastening portion that needs to have a waterproof function.

[0002]

2. Description of the Related Art Examples of application of the prior art will be described below.

FIG. 3 is a sectional view of a housing. The housing 1 houses the device 2. In order to protect the device 2 from external water, dust, etc., a cover 3 is provided at the opening of the housing 1. In order to make the cover 3 openable and closable and to have a waterproof function when the cover 3 is closed, a packing 4 and a packing receiver 5 are provided between the housing 1 and the cover 3 so that the waterproof treatment is performed. Have been. That is, the packing receiver 5 is welded to the casing 1 at the portion A and is waterproofed by the sealant, and the space between the cover 3 and the packing receiver 5 is waterproofed by the packing 4. Further, a hexagonal bolt 7 is screwed into a welding nut 6 welded to the back side of the housing 1 at a portion B, thereby fixing the cover 3 to the housing 1.

FIG. 4 is an enlarged sectional view taken along the line YY of FIG. A spring washer 9 is provided between the hex bolt 7 and the cover 3.
And a flat washer 10 are attached. Hex bolt 7
By completely tightening the spring washer 9
, And the cover 3 can be securely fixed to the housing 1. However, between the cover 3 and the flat washer 10, between the flat washer 10 and the spring washer 9,
A gap is created between the spring washer 9 and the hexagon bolt 7. Therefore, after the cover 3 is fixed to the housing 1, it is general that the entire circumference of the bolt portion is waterproofed with the silicone compound 12 or the like.

[0005]

However, in the above prior art, even if the bolts are waterproofed with a silicone compound, if the waterproofing is insufficient, water or water is applied to the bolts from the gap due to the effect of wind pressure. There is a problem that dust enters the inside of the housing. Furthermore, when opening and closing the cover, it is necessary to repeat the waterproofing work every time the cover is opened and closed again to loosen the bolts,
Maintenance workability decreases.

An object of the present invention is to solve the above-mentioned problems in the prior art and to provide a bolt which improves workability while maintaining a waterproof function higher than that of the conventional art.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide a disk-shaped flange on the lower surface of a hexagonal portion of a normal hexagonal bolt, cut a ring-shaped groove on the opposite side of the hexagonal portion from the flange surface, and further form an O.D. Achieved by inserting a ring.

That is, according to the above-described means, by screwing the bolt in for fastening, the O-ring between the part to be fastened such as the housing cover and the flange surface is compressed, and the water from the bolt part is compressed. -Intrusion of dust and the like can be prevented. That is, only by performing a simple operation of inserting an O-ring into the groove of the flange, there is no need to perform a waterproofing process in addition to attaching and detaching the bolt, and the workability can be improved.

[0009]

Embodiments of the present invention will be described below.

FIG. 1 is a sectional view of the housing. The housing 1 houses the device 2. In order to protect the device 2 from external water, dust, etc., a cover 3 is provided at the opening of the housing 1. Also, between the housing 1 and the cover 3,
There are a packing 4 and a packing receiver 5, which are waterproofed. That is, the packing receiver 5 is welded to the casing 1 at the portion A and is waterproofed by the sealant, and the space between the cover 3 and the packing receiver 5 is waterproofed by the packing 4. With such a configuration, the cover 3 is detachable from the housing 1 and has a waterproof function in the mounted state.

However, since the cover 3 cannot be fixed to the housing 1 as it is, a hexagonal bolt 7 is screwed into a welding nut 6 welded at a portion B on the back side of the housing 1, whereby the cover 3 is attached to the housing 1. It is designed to be fixed at 1.
In this embodiment, the bolt has a hexagonal head shape, but may have a hexagonal hole at the center of the cylinder or a square pole.

FIG. 2 is an enlarged view of a section XX of FIG. A hexagonal bolt 7 has an integral structure by welding a flange 8 having the shape shown in FIG.
In addition, the C portion is prevented from entering water and dust from this portion by full fillet welding.

A cylindrical hole having a depth of t8 is provided in the flange 8, and a spring washer 9 and a flat washer 10 are mounted therein. When the thickness of the spring washer 9 is t9 and the thickness of the flat washer 10 is t10,

[0014]

[Formula 1] t9 + t10> t8 (Formula 1)

That is, hexagon bolt 7 and flange 8
When screwing the integrated body into the welding nut 6 welded to the housing 1 at the portion B, the spring washer 9 is compressed by preventing the lower surface of the flange 8 from contacting the surface of the cover 3. In order to obtain the effect of tightening and loosening, the relationship of (Equation 1) is satisfied.

An O-ring 11 is fitted on the lower surface of the flange 8. When the hexagon bolt 7 is completely tightened, the distance between the bottom surface of the groove on the lower surface of the flange 8 for fitting the O-ring 11 and the surface of the cover 3 is H, and the diameter of the cross section in a state where no external force is applied to the O-ring 11 is If D

[0017]

## EQU2 ## If D> H (Equation 2), the O-ring 11 is compressed by (D−H), and this portion can be provided with a waterproof / dustproof function. Become.

[0018]

According to the present invention, when the bolt is screwed in, the O-ring between the flange surface and the cover is compressed, and the bolt is fastened while preventing intrusion of water, dust and the like from the bolt portion. It becomes possible. In other words, there is no need to apply a waterproof treatment again in addition to attaching and detaching the bolt, and the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a housing shown as an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG. 1;

FIG. 3 is a side view of a housing shown as a conventional example.

FIG. 4 is a sectional view taken along line YY of FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Equipment, 3 ... Cover, 4 ... Packing, 5 ...
Packing receiver, 6 ... welding nut, 7 ... hexagon bolt, 8 ...
Flange, 9: Spring washer, 10: Flat washer, 11: O-ring, 12: Silicone compound.

Continued on the front page (72) Inventor Masahiro Matsuura 1070 Ma, Hitachinaka-shi, Ibaraki Pref.

Claims (1)

[Claims] 1. A disk-shaped plate provided on a screw and one end thereof such that the center of rotation of the screw and the central axis of the screw coincide with each other, and a center of the disk-shaped plate on a surface opposite to the screw. Consisting of a cylinder or polygonal column attached so that their axes coincide, the disk-shaped plate has a ring-shaped groove on the screw side centered on the center of the screw and its elasticity inside the groove. A bolt characterized by inserting a ring with a groove according to a groove shape.