Abstract A pressure switch for use in a device for alarming the reduction of pneumatic pressure of vehicle tire is disclosed. The switch comprises a base board, a bellofram secured to the base board and having conductive coating of one electric contact applied to the inner surface and the outer surface thereof and having both bellows and diaphragm characteristics, a housing provided to enclose the bellofram and for defining a hermetic chamber, and a conductor provided at inner portion and outer portion of the bellofram near the center of the diaphragm portion thereof and for forming another electric contact. A back pressure is applied to the inner portion or outer portion of the bellofram against the pneumatic pressure of a vehicle tire.
Inventors
👤 Masato Hodate
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-04 14:39
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A method of manufacturing a bellofram comprising a metal cylindrical bellows and a metal diaphragm, said method comprising: providing a metal having a relatively low melting point; subjecting said provided metal to a molding process to form a mold having desired dimensions and a desired shape; plating a gold layer onto said formed mold; applying a metal layer on said plated gold layer, said applied metal layer having a relatively high melting point, corrosion resistance and a high elastic modulus; and dissolving said mold.
Claim 2
Independent Claim
84 words
A method of manufacturing a bellofram comprising a metal cylindrical bellows and a metal diaphragm, said method comprising: providing a metal having a relatively low melting point; subjecting said provided metal to a molding process to form a mold having desired dimensions and a desired shape; plating a gold layer onto said formed mold; applying a metal layer on said plated gold layer, said applied metal layer having a relatively high melting point, corrosion resistance and a high elastic modulus; and dissolving said mold.
Claim 3
Dependent Claim
21 words
The method according to claim 1, wherein said gold layer is plated to a thickness of between 1 and 3 μm.
Claim 4
Dependent Claim
20 words
The method according to claim 1, wherein said applied metal layer has a thickness of between 30 and 100 μm.
Claim 5
Dependent Claim
14 words
The method according to claim 1, wherein said subjecting step forms a male mold.
Claim 6
Dependent Claim
12 words
The method according to claim 1, wherein said mold is chemically dissolved.
Claim 7
Dependent Claim
15 words
The method according to claim 1, wherein said mold is dissolved by a molten process.
Claim 8
Dependent Claim
14 words
The method according to claim 1, wherein said subjecting step forms a female mold.