Hazardous environment pressure-sensing switch
AssigneeHealy Systems, Inc.
InventorJames W. Healy
Life of this patent
Estimating the term…
Abstract
A pressure-sensing switch assembly has an electrical region and a gasoline vapor system pressure region separated by a vapor and liquid impermeable wall, without sealing or flexible membrane devices. An electrical reed switch is adjustably mounted on a flexure arm at one side of the wall and a magnet is mounted to a pivoting carrier at an opposite side of the wall. The magnet moves in response to vapor pressure in the gasoline vapor system pressure region acting on a diaphragm. The magnetic field acts through the wall to open or close the reed switch at predetermined vacuum or pressure differential conditions.
Claims21
An explosion-proof, pressure responsive shut-off switch comprising:
- a body defining a first, gasoline vapor system pressure region and a second, electrical region, and a vapor and liquid impermeable wall therebetween,
- a magnet mounted in the first, gasoline vapor system pressure region for movement, in response to vapor pressure, between a first position spaced from said vapor and liquid impermeable wall and a second position relatively more closely adjacent said vapor and liquid impermeable wall, said magnet being mounted on a pivot arm, said pivot arm having an adjustable pivot for adjusting a ratio of movement of said magnet, relative to said vapor and liquid impermeable wall, to change in vapor pressure, and
- a reed switch mounted in the second, electrical region in proximity to said vapor and liquid impermeable wall, and adapted to open and close a vacuum pump switch in response to movement of said magnet between said first position and said second position.
An explosion-proof, pressure responsive shut-off switch comprising:
- a body defining a first, gasoline vapor system pressure region and a second, electrical region, and a vapor and liquid impermeable wall therebetween,
- a magnet mounted in the first, gasoline vapor system pressure region for movement, in response to vapor pressure, between a first position spaced from said vapor and liquid impermeable wall and a second position relatively more closely adjacent said vapor and liquid impermeable wall, said magnet being mounted on a pivot arm, and
- a reed switch mounted in the second, electrical region in proximity to said vapor and liquid impermeable wall, and adapted to open and close a vacuum pump switch in response to movement of said magnet between said first position and said second position, said reed switch being mounted on a flexure arm.
Dependencies are inferred from the claim text.