JP3404665B2 - Cap with breather - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap for closing an opened hole, and more particularly to a pressure valve mechanism provided by combining a metal plate and an elastic body in a layered manner. Check the cap with a breather. 2. Description of the Related Art Conventionally, an opening provided in a housing for machine installation or maintenance adjustment needs to be closed after installation or adjustment is completed, and a metal lid member is fitted into the opening to close the opening. In order to prevent leakage of oil and grease inside the school machine, a coating such as rubber or an O-ring is attached to the metal lid member so that a strong sealing force is exerted. Further, in the case of a metal cover material to which a coating of rubber or the like or an O-ring or the like that closes an opening of a constant velocity joint or the like is fully attached, as shown in FIG. In order to prevent adverse effects such as swelling of boots, the metal stem material is used as a breather.
A pressure relief structure in which a small cut (7, slit) is formed by a cut knife in a part of (B) can be seen. [0003] As described above, the Kanao lid material (B) in which a breather such as a constant velocity joint is formed.
Although it has the function of adjusting the pressure, it requires a lot of precise manufacturing processes such as rubber coating molding, insertion and installation of O-rings, and slitting as the lid material of the opening (1), which requires 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. 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, as shown in FIG. The opening
A cap (A) with a breather having a pressure adjusting means for sealing (1), wherein said cap (A) with a breather has 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 pressure catching die (4) to cause the compressed portion to flow laterally. A part located at the end face of (4) is cut through with a cutting knife (5) and pressed and deformed together with the metal plate (3) to form a staggered concave shape (6) as shown in FIG. It is characterized by that. DETAILED DESCRIPTION OF THE INVENTION A cap with a breather of the present invention
In the molding of (A), a metal plate (3) on which an elastic coating (2) is formed is prepared, and when this is formed into a cap shape as shown in FIG. 1, a compression die (4) is formed as shown in FIG. ) To compress a portion thereof to generate a lateral flow in the elastic coating (2) below the compression die (4) and to transfer the mass to the uncompressed portion. Then, while partially cutting the part located at the end face of the compression die (4) with the cutting knife (5) and pressing the metal die (3) as it is, the elastic coating as shown in FIG. Staggered concave shape having (2a)
(6) is formed. In this case the protruding concave (6) side of the elastic film (2a) is pressed by an elastic force to be restored to the end surface of the cut portion, inside and outside as in FIG. 3 through a cut portion The elastic coating (2a)
The thing is to exhibit sufficient sealing performance. And for the generation of the pressure difference, the cut portion of the elastic film (2a) is the mosquito
A pressure difference was created due to its close contact with the end face of the socket.
Relieve pressure to the other side, always maintain the proper pressure conditions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In forming a cut portion in the present invention, the relationship between a compression die (4) for generating a lateral flow and a cut knife (5) is such that the elastic coating (2) of the cut portion is partially projected. In order to form the cut portion, it is desirable to arrange the cut portions close to each other, and when forming the cut portion, the elastic coating protruded by bringing the compression die (4) into contact with the elastic coating (2) prior to the cutting knife (5).
(2a) can be formed. [0007] By the above formation, the following excellent effects can be obtained. In the cap with a breather according to the present invention, a good pressure adjusting action and a sealing action can be 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 found and the unstable sealing state was found, but the present invention has completely solved the problem. 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 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. [Description of References] A Cap with breather B Metal cover 1 Opening 2 Elastic coating 2a Elastic coating 3 protruding Metal plate 4 Compression die 5 Cut knife 6 Concave shape 7 Small cut

Claims (1)

(57) Claims 1. A cap with a breather having pressure adjusting means for joining and inserting into an opening and sealing the opening, wherein the cap with a breather is made of a metal plate having an elastic coating. A part of the elastic coating of the metal plate is compressed by a compression die and laterally deformed. Thereafter, a part located at an end face of the compression die is pushed and deformed while being cut through with a cutting knife. A cap with a breather characterized by being shaped into a concave shape.