JPH10264957A - Cap with breather - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap to be set and inserted into an opening to seal the opening and provided with a cap mechanism using an extremely simple laminate for carrying out the good pressure adjustment and the powerful sealing for a long period of time. SOLUTION: A cap A with a breather to be fitted into an opening 1 of a mechanical device and sealing the opening 1 is provided, and the cap A with the breather is composed of a laminate of metal sheets 3 with elastic films 2, and the elastic films 2 are compressed and flowed horizontally by a compression die and cut through by a cutting knife and force deformed together with the metal sheets 3 to be formed into the offset recessed shape 6. The good pressure adjustment and sealing can be provided, and also the infiltration of water, dust, foreign matters and the like from outside can be prevented by the arrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap for closing an open hole, and more particularly to a cap with a breather provided with a pressure valve mechanism by combining a metal plate and an elastic body in a layered manner.

[0002]

2. Description of the Related Art Conventionally, an opening provided for mechanical installation or maintenance adjustment in a housing must be closed after installation or adjustment is completed, and a metal lid member is fitted into the opening to close the opening. In addition, in the metal lid member, a coating such as rubber or an O-ring is attached together to prevent leakage of oil and grease inside the machine to exert a strong sealing force. Further, in the case of a metal lid member provided with a coating of rubber or the like or an O-ring or the like for closing an opening of a constant velocity joint or the like, as shown in FIG. In order to prevent adverse effects such as swelling of boots, a pressure relief structure in which a small cut (7, slit) is formed by a cut knife in a part of the metal lid material (B) as a breather is seen.

[0003]

As described above, a metal lid member (B) having a breather such as a constant velocity joint is formed.
Although it has the function of adjusting the pressure, the lid material of the opening (1) requires many precise manufacturing processes such as rubber coating molding, O-ring insertion and mounting, and slit processing, which results in high cost. Would. SUMMARY OF THE INVENTION An object of the present invention is to provide a cap with a breather which eliminates such conventional drawbacks, achieves a good pressure adjustment with an extremely simple structure, and provides a strong sealing action for a long period of time.

[0004]

SUMMARY OF THE INVENTION As shown in FIG. 1, the present invention inserts and fits into an opening (1) for assembling parts or adjusting a device formed in a constant velocity joint or the like. A cap (A) with a breather having a pressure adjusting means for sealing (1), wherein the cap (A) with a breather is made of a metal plate (3) having an elastic coating (2) of synthetic rubber, synthetic resin or the like. As shown in FIG. 2, a part of the flat portion of the elastic coating (2) on the metal plate (3) is compressed by a compression die (4) to cause the compressed portion to flow laterally. ), The metal plate (3) is pressed and deformed together with the metal plate (3) while passing through a portion located at the end face with a cutting knife (5), and the cut portion is shaped into a staggered concave shape (6) as shown in FIG. It is characterized by.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In forming a cap (A) with a breather according to the present invention, a metal plate (3) on which an elastic coating (2) is formed is prepared and formed into a cap shape as shown in FIG. 2, a part thereof is compressed by the compression die (4) to generate a lateral flow in the elastic coating (2) below the compression die (4), and the mass is moved to an uncompressed part. Then, while partially cutting the part located at the end face of the compression die (4) with a cutting knife (5) and pressing and deforming the part including the metal plate (3) as it is, a projecting elastic coating as shown in FIG. A staggered concave shape (6) having (2a) is formed. At this time, the elastic coating (2a) on the side of the concave portion (6) that has flowed laterally is pressed against the end face of the cut portion by the elastic force that is going to be restored, and even if the inside and the outside penetrate as shown in FIG. It will exhibit sealing properties. When the pressure difference is generated, the elastic coating (2a) of the cut portion smoothly releases the pressure to the other side by the elastic action, and always performs the optimal pressure adjustment.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In forming a cut portion in the present invention, the relationship between a compression die (4) that generates a lateral flow and a cut knife (5) is that the elastic coating (2) of the cut portion is formed to protrude partially. It is desirable that the elastic coating (2a) protrudes by bringing the compression die (4) into contact with the elastic coating (2) prior to the cutting knife (5) when forming the cut portion. .

[0007]

According to the above configuration, the following excellent effects can be obtained. In the cap with the breather of the present invention, a good pressure adjusting action and a good sealing action are obtained by the concave shape (6) having a stagger and the elastic coating (2a) which is in close contact with the staggered end face. In the breather of the small incision (7), some gaps were observed, and the unstable sealing state was completely solved by the present invention. Therefore, it is free from intrusion of water, dust foreign matter and the like from the outside. As described above, according to the present invention, a cap having a good pressure adjusting function can be easily formed with a very small number of steps using inexpensive materials, and a cap with a breather having excellent sealing action can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a manufacturing process of the present invention.

FIG. 3 is a cross-sectional view showing one embodiment formed according to FIG. 2;

FIG. 4 is a cross-sectional view showing a conventional structure example not using the present invention.

[Explanation of symbols]

 Reference Signs List A Cap with breather B Metal cover 1 Opening 2 Elastic coating 2a Elastic coating protruding 3 Metal plate 4 Compression die 5 Cut knife 6 Concave shape 7 Small cut

Claims (1)

[Claims] 1. A cap with a breather having pressure adjusting means for fitting and inserting into an opening to seal the opening, wherein the cap with a breather is made of a metal plate having an elastic coating. A part of the elastic coating is compressed by a compression die and laterally deformed, and then a part located on an end face of the compression die is pushed and deformed while being cut through with a cutting knife, and the cut part is shaped into a staggered concave shape. A cap with a breather characterized by the following.