Title:
FLUID ACTIVATED SWITCH APPARATUS
Document Type and Number:
WIPO Patent Application WO1991000607
Kind Code:
A3
Abstract:
A pneumatic switch unit includes a switch housing. A conductive contact spring is mounted between diametric supports, one being adjustable. The spring has a central actuator arm and an offset contact arm interconnected to an encircling frame. A two piece switch actuator has clamp members clamped to the actuator arm. Separate end closure members secured to the switch housing ends. The closure member may clamp a diaphragm against the housing, with the diaphragm engaging the actuator. The closure member may have a mechanical actuating member or a simple closure plate engaging the actuator. The two switch housings may be mounted to the opposite sides of a single pressure chamber with end diaphragms closing the opposed ends of the switch housing. The pressure actuates both switch units to establish a sequence switch unit. The spring has a rectangular frame with a central opening having an actuating arm therein. The opposite spring ends are mounted in supports one of which is adjustable. A contact arm is secured to one end and projects parallel to the side. The opposite spring corner includes a notch to control the snap action. An alternate spring has an annular ring with a chordal actuator arm and a chordal contact arm. The spring is mounted on a line perpendicular to the two arms.
Inventors:
ATKINSON LOUIS D (US)
SMITH TERENCE T (US)
SMITH TERENCE T (US)
Application Number:
PCT/US1990/003736
Publication Date:
April 04, 1991
Filing Date:
June 29, 1990
Export Citation:
Assignee:
ATKINSON LOUIS D (US)
International Classes:
H01H35/26; H01H35/34; (IPC1-7): H01H35/34
Foreign References:
| US3830995A | 1974-08-20 | |||
| US4458117A | 1984-07-03 | |||
| FR2213572A1 | 1974-08-02 | |||
| US3573410A | 1971-04-06 |
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