US3569647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bourdon tube actuated electrical switch
Assignee: Caterpillar Inc
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Filing: 1969-06-23
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Granted: 1971-03-09
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Expires: 1989-06-23
Abstract
Abstract A Bourdon tube connected with a microswitch for closing it upon the event of predetermined pressure in a fluid circuit with which the tube is associated. The tube is contained in a liquid tight housing and immersed in a damping fluid to prevent actuation by momentary pressure variations. The switch is adjustable and disposed outside the housing to permit convenient adjustment and add to its useful life by isolating it from the damping fluid.
Inventors
- 👤 Jozef Kiwalie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:31
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A bourdon tube actuated switch comprising a vessel, a Bourdon tube within the vessel, a viscous liquid in the vessel immersing the tube, a switch mounted exteriorly of the vessel, and a connection between the free end of the tube and the switch extending through the vessel wall to actuate the switch upon the event of a predetermined pressure within the tube, the connection including a plunger slidably extending through the vessel wall for actuating engagement with the switch, a seal being arranged around the plunger to prevent escape of liquid from the vessel, and a link pivotally interconnected between an end of the plunger within the vessel and the free end of the tube.
Claim 2
Dependent Claim
115 words
A bourdon tube actuated switch comprising a vessel, a Bourdon tube within the vessel, a viscous liquid in the vessel immersing the tube, a switch mounted exteriorly of the vessel, and a connection between the free end of the tube and the switch extending through the vessel wall to actuate the switch upon the event of a predetermined pressure within the tube, the connection including a plunger slidably extending through the vessel wall for actuating engagement with the switch, a seal being arranged around the plunger to prevent escape of liquid from the vessel, and a link pivotally interconnected between an end of the plunger within the vessel and the free end of the tube.
Claim 3
Dependent Claim
29 words
The invention of claim 1 wherein the switch is mounted for adjustment toward and away from the vessel adjacent an end of the plunger extending through the vessel wall.
Claim 4
Dependent Claim
27 words
The invention of claim 2 further comprising adjusting means for urging the switch toward the plunger and spring means for maintaining the switch against the adjusting means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |