초록 ▼

An electric proximity switch of the type that is inserted into the cylinder wall of a hydraulic cylinder and is sealed tight with respect to the hydraulic fluid, the proximity sensor having a pick-up coil (24), a pot core (32) adapted to receive the pick-up coil, a cup-shaped insert member (20) with

An electric proximity switch of the type that is inserted into the cylinder wall of a hydraulic cylinder and is sealed tight with respect to the hydraulic fluid, the proximity sensor having a pick-up coil (24), a pot core (32) adapted to receive the pick-up coil, a cup-shaped insert member (20) within which the pick-up coil and pot core are confined, and a closure disc (34) that is separate of the insert member and is positively retained in sealed relation over the insert member and its contents by securing means (10d) in the casing sleeve (10) of the proximity sensor.

대표청구항 ▼

An electric proximity sensor of the type which in use is exposed to pressure fluid and which comprises a casing having an interior chamber space open at one axial end and bounded circumferentially by a sidewall and at the opposite axial end by a transverse wall, a pick-up coil and pot core unit disp

An electric proximity sensor of the type which in use is exposed to pressure fluid and which comprises a casing having an interior chamber space open at one axial end and bounded circumferentially by a sidewall and at the opposite axial end by a transverse wall, a pick-up coil and pot core unit disposed within said interior space, a closure closing said one axial end and an O-ring seal circumferentially sealing between said closure and said sidewall, characterized in that a separate insert member is provided between said unit and said walls bounding said interior space, said insert member being dimensioned to fit closely with respect to said walls and comprising a cavity which is open toward said one axial end, said cavity being dimensioned to receive said unit with a close fit, said insert and said unit substantially filling said interior space, said sensor further comprising means defining a shoulder which extends circumferentially around the inside perimeter of said sidewall at said one axial end of said casing, said closure having a circumferential margin which is disposed to radially overlap said shoulder, said O-ring seal being disposed on said shoulder, and means for retaining said closure on said casing such that said O-ring seal is axially compressed against said shoulder by the circumferential margin of said closure and forms a circumferential seal between said closure and said casing.