Pressure-operated switch

Details Pressure-operated switch Pressure-operated switch

1975-04-14

1976-09-21

Miller, J D

Electricity: magnetically operated switches, magnets, and electr

Permanent magnet-actuated switches

Plural magnets

200 819M, 200 83L, 335205, H01H 8502

Patent

active

039822176

ABSTRACT:
A nonexplosive pressure-responsive switch has a housing containing a chamber which is exposed to a source of pressure and a second chamber containing switch elements. A partition separates the two chambers. The chamber connected to the pressure to be monitored has a longitudinal collapsible bellows mounted inside with a first magnet mounted on its end. In an unpressured condition the magnet will normally touch the partition between the chambers. The second chamber containing the switch elements also contains a second magnet which is mounted in an adjustable cylinder. A third magnet is mounted between the adjustable magnet and the switch contacts. When the first magnet is against the partition, the first magnet pulls the movable magnet in the second chamber against the switch contacts, and when the first magnet moves away from the partition, the adjustable magnet attracts the movable magnet, breaking the switch contacts. A second set of switch contacts can be carried by the adjustable magnet's housing.

REFERENCES:
patent: 3458841 (1969-07-01), Davis
patent: 3608472 (1971-09-01), Pelster et al.
patent: 3611220 (1971-10-01), Hoffman
patent: 3896280 (1975-07-01), Blake

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