| 摘要 |
A proximity switch for signaling the location of a movable member at either of opposite end limits of movement relative to a stationary frame includes a movable member, such as a piston, traveling along a fixed path of movement between a first position and a second position and having an aperture formed within the movable member extending from one end toward another end. A housing encloses a portion of the movable member to form a first fluid chamber between the movable member and a first end of the housing, and to form a second fluid chamber between a second end of the housing and the movable member. Expansion of the first fluid chamber drives the movable member to the first position and expansion of the second fluid chamber drives the movable member to the second position. A sensor-supporting member is connected at one end to the housing with another end extending parallel to the path of travel of the movable member toward the second end of the housing engaged within a non-electrically conductive sleeve fixedly disposed in the aperture of the movable member. Sensor switches are mounted on a non-electrically conductive portion of the sensor-supporting member for sensing the first and second positions of the movable member. The sensor switches are activated by annular electrically conductive contacts disposed on an inner surface of the insulated sleeve disposed within the aperture of the movable member.
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