A plunger switch for use as a switch element in an electrical circuit, has a housing and a plunger movable axially in a bore of the housing in the direction of a longitudinal axis and when in an operating position in which it is depressed toward the housing, acts on an electronic sensor unit situate
A plunger switch for use as a switch element in an electrical circuit, has a housing and a plunger movable axially in a bore of the housing in the direction of a longitudinal axis and when in an operating position in which it is depressed toward the housing, acts on an electronic sensor unit situated in the housing, which in turn initiates a switching procedure in the electrical circuit by electrical pulses, and the plunger, in its axial plunging region into the bore of the housing, is peripherally provided with at least one lubricating groove, which permits a lubricating fluid to travel into the axial plunging region between the plunger and bore, and the electronic sensor unit is protected from a penetration of lubricating fluid.
대표청구항▼
1. A plunger switch for use as a switch element in an electrical circuit, comprising a housing and a plunger that is able to move axially in a bore of the housing in a direction of a longitudinal axis and when in an operating position in which it is depressed toward the housing, acts on an electroni
1. A plunger switch for use as a switch element in an electrical circuit, comprising a housing and a plunger that is able to move axially in a bore of the housing in a direction of a longitudinal axis and when in an operating position in which it is depressed toward the housing, acts on an electronic sensor unit situated in the housing, which in turn initiates a switching procedure in the electrical circuit by electrical pulses, wherein the plunger, in its axial plunging region into a bore of the housing, is peripherally provided with at least two lubricating grooves, wherein the lubricating grooves permit a lubricating fluid to travel into the axial plunging region between the plunger and bore, wherein the electronic sensor unit has means for protecting the electronic sensor unit from a penetration of lubricating fluid, and wherein the at least two lubrication grooves extend around the longitudinal axis of the plunger in form of a double helix. 2. The plunger switch as recited in claim 1, wherein the means for preventing the electronic sensor unit from a penetration of lubricating fluid encapsulate the electronic sensor unit in plastic. 3. The plunger switch as recited in claim 2, wherein the plastic which encapsulates the electronic sensor unit is a hardening plastic. 4. The plunger switch as recited in claim 2, wherein the means for preventing encapsulates electronic components situated in the housing that are not part of the electronic sensor unit. 5. A plunger switch for use as a switch element in an electrical circuit, comprising a housing and a plunger that is able to move axially in a bore of the housing in a direction of a longitudinal axis and when in an operating position in which it is depressed toward the housing, acts on an electronic sensor unit situated in the housing, which in turn initiates a switching procedure in the electrical circuit by electrical pulses, wherein the plunger, in its axial plunging region into a bore of the housing, is peripherally provided with at least one lubricating groove, wherein the at least one lubricating groove permits a lubricating fluid to travel into the axial plunging region between the plunger and bore, and wherein the electronic sensor unit has means for protecting the electronic sensor unit from a penetration of lubricating fluid and wherein the electronic sensor unit includes a Hall sensor whose magnetic field lines are at least partially shielded toward an outside. 6. The plunger switch as recited in claim 5, wherein a magnetic shielding of the Hall sensor includes a shielding element selected from the group consisting of a shielding tube and a shielding foil and composed of magnetically conductive material. 7. The plunger switch as recited in claim 5, wherein the Hall sensor is mounted in stationary fashion relative to the housing and the magnetic shielding is situated so that it is movable along with the plunger relative to the housing. 8. A plunger switch for use as a switch element in an electrical circuit, comprising a housing and a plunger that is able to move axially in a bore of the housing in a direction of a longitudinal axis and when in an operating position in which it is depressed toward the housing, acts on an electronic sensor unit situated in the housing, which in turn initiates a switching procedure in the electrical circuit by electrical pulses, wherein the plunger, in its axial plunging region into a bore of the housing, is peripherally provided with at least one lubricating groove that permits a lubricating fluid to travel into the axial plunging region between the plunger and bore,wherein the electronic sensor unit has means for protecting it from a penetration of lubricating fluid,wherein the housing is composed of two parts including a top part and a bottom part, and between the top part and bottom part of the housing, a sealing element is provided to prevent an escape of lubricating fluid from the housing,wherein the means for protecting the electronic sensor unit from a penetration of lubricating fluid includes a mechanical cover of the sensor unit, andwherein the mechanical cover of the sensor unit: is shaped as a Bundt cake,at the Bundt cake edges is sealed in a fluid-tight fashion against the bottom part of the housing by at least one sealing element, andincludes a chimney-like, hollow cylindrical central region that permits a compression spring abutting the plunger to extend through the hollow cylindrical central region in an assembled state of the plunger switch. 9. The plunger switch as recited in claim 8, wherein at its radially outer annular rim, the mechanical cover is sealed in a fluid-tight fashion against the top part and bottom part of the housing by a first sealing ring and at a radially inner annular rim of its chimney-like, hollow cylindrical central region, the mechanical cover is sealed in a fluid-tight fashion against the bottom part of the housing by an additional sealing ring.
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이 특허에 인용된 특허 (5)
Schad Charles A. (Tulsa OK), Detector for a meter prover.
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