Patent US3598946A successfully refreshed from Google Patents.
US3598946A
Expired / Lapsed
US
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Pressure switch responsive to extra low pressure
Assignee: Eaton Corp
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Filing: 1969-12-24
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Granted: 1971-08-10
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Expires: 1989-12-24
Abstract
Abstract In normal operation, the rising diaphragm raises the actuator and spring seat against the force of the reset spring. Just before reaching the trip point of the switch in one form, the seat engages the strip spring eyelet so the pressure is opposed by both springs, the force of the trip spring- and, hence, the operating pressure of the switch- being determined by the position of the plunger. As the pressure decreases under the diaphragm, the eyelet bottoms in the well before reset so the reset force on the diaphragm is determined by the reset spring only. At extra low level settings the plunger is allowed to rise until the spring lifter is picked up by the plunger- to cancel out the force of the trip spring- and lifted a little by the reset spring so the seat cannot engage the eyelet before the trip point. Therefore, at this setting the diaphragm is opposed only by the reset spring. The second modification differs in that the reset spring is affected by the trip spring adjustment.
Inventors
- 👤 Tore B Hanssen
- 👤 Erich Kothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:37
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/2607; H01H35/2614
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
181 words
In a pressure switch of the type including a housing divided into a pressure chamber and a switch chamber by a flexible diaphragm with a switch in the switch chamber moved from one position to another position at a trip point as the diaphragm moves with increasing pressure in the pressure chamber and returning to said one position at a reset point as the diaphragm returns as the pressure in the pressure chamber falls, the improvement comprising, a reset spring means opposing diaphragm movement, trip spring means positioned to become effective to oppose the diaphragm before the trip point is reached and to become ineffective before the reset point is reached upon return movement of the diaphragm, means for adjusting the effective force of the trip spring means to vary the response characteristics of the pressure switch, and means for rendering one of the spring means ineffective to oppose the diaphragm whereby only the other spring means opposes the diaphragm at both the trip point and reset point and the pressure switch responds to very low pressures in the diaphragm chamber.
Claim 2
Dependent Claim
181 words
In a pressure switch of the type including a housing divided into a pressure chamber and a switch chamber by a flexible diaphragm with a switch in the switch chamber moved from one position to another position at a trip point as the diaphragm moves with increasing pressure in the pressure chamber and returning to said one position at a reset point as the diaphragm returns as the pressure in the pressure chamber falls, the improvement comprising, a reset spring means opposing diaphragm movement, trip spring means positioned to become effective to oppose the diaphragm before the trip point is reached and to become ineffective before the reset point is reached upon return movement of the diaphragm, means for adjusting the effective force of the trip spring means to vary the response characteristics of the pressure switch, and means for rendering one of the spring means ineffective to oppose the diaphragm whereby only the other spring means opposes the diaphragm at both the trip point and reset point and the pressure switch responds to very low pressures in the diaphragm chamber.
Claim 3
Dependent Claim
97 words
The pressure switch according to claim 1 including, means actuated by the diaphragm to transmit motion thereof to the switch, said reset spring acting on the motion-transmitting means, said motion-transmitting means normally engaging the trip spring means to be opposed thereby before the trip point is reached and being disengaged from the trip spring means before the reset point is reached after tripping, said means for rendering the trip spring means ineffective being operative to move the trip spring means to a position in which the motion transmitting means in unable to engage the trip spring means.
Claim 4
Dependent Claim
46 words
The pressure switch according to claim 2 in which, the trip spring means includes an eyelet and a plunger and a trip spring compressed therebetween, said adjusting means acting on the plunger to vary the compression of the trip spring, said motion-transmitting means engaging the eyelet.
Claim 5
Dependent Claim
55 words
The pressure switch according to claim 3 in which the eyelet and the motion-transmitting means have cooperating shoulders which are normally engageable and the means rendering the trip spring ineffective moves the eyelet to a position in which its shoulder is beyond the travel of the shoulder on the transmitting means at the trip point.
Claim 6
Dependent Claim
21 words
The pressure switch according to claim 4 in which the reset spring is compressed between the transmitting means and the eyelet.
Claim 7
Dependent Claim
46 words
The pressure switch according to claim 5 in which the means rendering the trip spring ineffective includes a lifter engageable with the eyelet, said lifter being actuated when the plunger adjusting means is moved to a position corresponding to a low force on the trip spring.
Claim 8
Dependent Claim
49 words
The pressure switch according to claim 6 in which the plunger and the lifter become engaged when the trip spring is rendered ineffective whereby the only force acting on the transmitting means is the reset spring and the force of the reset spring is determined by the plunger position.
Claim 9
Dependent Claim
95 words
In a pressure switch of the type including a housing divided into a pressure chamber and a switch chamber by a flexible diaphragm with a switch in the switch chamber moved from one position to another position at a trip point as the diaphragm moves with increasing pressure in the pressure chamber and returning to said one position At a reset point as the diaphragm returns as the pressure in the pressure chamber falls, the improvement comprising, two springs opposing the diaphragm, and means for rendering one of the springs ineffective for very low pressures.
Claim 10
Dependent Claim
95 words
In a pressure switch of the type including a housing divided into a pressure chamber and a switch chamber by a flexible diaphragm with a switch in the switch chamber moved from one position to another position at a trip point as the diaphragm moves with increasing pressure in the pressure chamber and returning to said one position At a reset point as the diaphragm returns as the pressure in the pressure chamber falls, the improvement comprising, two springs opposing the diaphragm, and means for rendering one of the springs ineffective for very low pressures.
Claim 11
Dependent Claim
19 words
The pressure switch according to claim 8 including means for adjusting the effective force of one of the springs.
Claim 12
Dependent Claim
17 words
The pressure switch according to claim 8 including means for adjusting the effective force of both springs.
Claim 13
Dependent Claim
24 words
The pressure switch according to claim 8 including means for adjusting the force of the spring which is effective while the other is ineffective.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |