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US 4,471,182 AGranted
Single pole make make switch and pressure switch using same
AssigneeThe Singer Company
InventorsThaddeus S. Wielgos, Richard L. Lauritsen
Life of this patent
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Abstract
A pressure switch has a solid piston sealed by a Kapseal and O-ring actuating a spring locator to compress a main spring and then a secondary (optional) spring. The locator actuates a slow moving end of a snap switch blade. The slow moving end has a contact which opens a low voltage circuit and then the snap switch end of the blade is actuated to open another circuit. This attains a single pole make make operation with sequencing assured.
Claims5
A pressure switch including:
- a housing
- a switch in said housing comprising a blade having an actuated portion, a contact bearing end which moves with a snap action between stops, at least one of which is a contact, when the actuated portion of the blade is moved with gradual motion between two limits, a contact for one of the limits and a contact on the actuated portion of the blade engageable with the limit contact in a slow make, slow break manner;
- three electrical terminals in said housing respectively connected to said blade and to said stop which is a contact and to said limit contact;
- a spring cartridge including a cup, a spring in the cup, and a spring locator bearing against the spring and slideable in the cup;
- an actuator engaged by the spring locator and engaging the actuated portion of the blade;
- and
- pressure responsive means bearing on and actuating the locator to compress the spring.
4 more elements
Dependencies are inferred from the claim text.