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Sealed housing for a remote switching device
| Details |
Inventors: Tinder, David V.; Loria, Frank S.;
Assignee: United Technologies Automotive, Inc. (Dearborn, MI)
Primary Examiner: Recla; Henry J.
Assistant Examiner: Barrett; Glenn T.
Attorney, Agent or Firm: Henley; Randy G.
A housing assembly (14) for protection of an enclosed printed circuit board (12) with a surface mounted dome switch (18) is disclosed. Various construction details are developed which provide sealing under a variety of atmospheric conditions. In one embodiment, the housing assembly is comprised of an upper portion (22), a lower portion (26), and a one piece, continuous diaphragm (30). The upper portion has an aperture (24) for engagement of a button actuator (20) by an external force. The diaphragm, composed of an elastic material, provides a sealed cavity (32) for the housing and permits substantial equalization between the internal and external pressure of the sealed cavity. |
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DETAILED DESCRIPTION We claim: 1.
An improved portable, remote switching device of the type having a switch and a housing assembly adapted to permit actuation of the switch by engagement between the housing and a force applying member, wherein the housing assembly comprises: a continuous first portion having a sealing groove extending peripherally about said first portion, said first portion being relatively rigid; a second portion having an aperture which permits application of the force applying member to the switch, said second portion being relatively rigid and engaged with said first portion to form a junction therebetween and to provide a rigid outer shell adapted to protect the switch; and a one piece, continuous diaphragm which extends from the junction between said first and second portions, said diaphragm being spaced from said first portion leaving a sealed cavity therebetween for the switch, the sealed cavity having no communication with the external environment of the sealed cavity, and said diaphragm having a flexibility characteristic which adapts said diaphragm to be readily moveable in response to a pressure difference between a pressure internal and a pressure external to the sealed cavity, wherein such movement includes said diaphragm pulling away from said second portion, said diaphragm having a sealing bead which extends peripherally about said diaphragm, said sealing bead being disposed in the sealing groove in abutting contact with said first portion to provide a sealing force for said housing assembly and having a resilient spur which in an uninstalled condition has a lateral width wider than the sealing groove and in an installed condition has said spur compressed and deformed by bending in towards said diaphragm to increase the sealing force and to discourage said sealing bead from sliding out of said sealing groove.
2.
The switching device according to claim 1, wherein said flexibility characteristic adapts said diaphragm to substantially equalize the difference in pressure across said diaphragm
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