US3742166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure switch
Assignee: Schneider Electric USA Inc
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Filing: 1971-10-12
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Granted: 1973-06-26
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Expires: 1991-10-12
Abstract
Abstract A modular differential spring and contact assembly is adapted for mounting on a pressure sensing module in selected positions providing optimum sensitivity for different spring rates of the pressure sensing components. Independent adjustment means are provided for range spring force, differential spring force, differential pick-up, and sensitivity so that the pressure switch assembly is operative in a wide variety of pressure ranges with different pressure sensing means, range springs and contact means.
Inventors
- 👤 C Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:08
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/2607
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
240 words
A pressure responsive device comprising: a pressure sensing module including a pressure chamber, a stem movable in one direction when pressure in the pressure chamber is greater than a selected value and movable in an other direction when the pressure in the pressure chamber is less than the selected value and including a first stem portion and a second stem portion, the second stem portion being mounted for rotational movement relative to the first stem portion, a compression spring having end portions and being arranged to apply a biasing force urging the stem to move in the other direction, means applying a pressure responsive force urging the stem to move in the one direction, an adjusting knob abutting one of the end portions of the compression spring, and a spring seat on the second stem portion abutting the other end portion of the compression spring, the adjusting knob being threadably mounted on the pressure sensing module to change the magnitude of the biasing force by rotation of the adjusting knob, the compression spring and the second stem portion, a differential module including means responsive to movement of the stem and connectable to the pressure sensing module in a plurality of positions, selectively, for providing different values of sensitivity for the pressure responsive device, and attachment means connecting the differential module to the pressure sensing module in one of the positions to provide a selected sensitivity for the pressure responsive device.
Claim 2
Dependent Claim
240 words
A pressure responsive device comprising: a pressure sensing module including a pressure chamber, a stem movable in one direction when pressure in the pressure chamber is greater than a selected value and movable in an other direction when the pressure in the pressure chamber is less than the selected value and including a first stem portion and a second stem portion, the second stem portion being mounted for rotational movement relative to the first stem portion, a compression spring having end portions and being arranged to apply a biasing force urging the stem to move in the other direction, means applying a pressure responsive force urging the stem to move in the one direction, an adjusting knob abutting one of the end portions of the compression spring, and a spring seat on the second stem portion abutting the other end portion of the compression spring, the adjusting knob being threadably mounted on the pressure sensing module to change the magnitude of the biasing force by rotation of the adjusting knob, the compression spring and the second stem portion, a differential module including means responsive to movement of the stem and connectable to the pressure sensing module in a plurality of positions, selectively, for providing different values of sensitivity for the pressure responsive device, and attachment means connecting the differential module to the pressure sensing module in one of the positions to provide a selected sensitivity for the pressure responsive device.
Claim 3
Dependent Claim
191 words
A pressure responsive device comprising: a pressure sensing module including a pressure chamber and a stem, the stem having end portions and being movable in one direction when pressure in the pressure chamber is greater than a selected value and movable in an other direction when the pressure in the pressure chamber is less than the selected value, a differential module having means responsive to movement of the stem and connectable to the pressure sensing module in a plurality of positions, selectively, for providing different values of sensitivity for the pressure responsive device, attachment means connecting the differential module to the pressure sensing module in one of the plurality of positions to provide a selected sensitivity for the pressure responsive device, a first flexible sheet member disposed exteriorly of the pressure chamber and secured at its edges, means connecting one of the end portions of the stem to the first flexible sheet member, and a second flexible sheet member disposed exteriorly of the pressure chamber, sEcured at its edges and provided with a central reinforcing member having an aperture therethrough for containing the other of the end portions of the stem.
Claim 4
Dependent Claim
191 words
A pressure responsive device comprising: a pressure sensing module including a pressure chamber and a stem, the stem having end portions and being movable in one direction when pressure in the pressure chamber is greater than a selected value and movable in an other direction when the pressure in the pressure chamber is less than the selected value, a differential module having means responsive to movement of the stem and connectable to the pressure sensing module in a plurality of positions, selectively, for providing different values of sensitivity for the pressure responsive device, attachment means connecting the differential module to the pressure sensing module in one of the plurality of positions to provide a selected sensitivity for the pressure responsive device, a first flexible sheet member disposed exteriorly of the pressure chamber and secured at its edges, means connecting one of the end portions of the stem to the first flexible sheet member, and a second flexible sheet member disposed exteriorly of the pressure chamber, sEcured at its edges and provided with a central reinforcing member having an aperture therethrough for containing the other of the end portions of the stem.
Claim 5
Dependent Claim
22 words
A pressure responsive device as in claim 2 wherein said means responsive to movement of the stem comprises an electric switch means.
Claim 6
Dependent Claim
138 words
A pressure responsive device as in claim 3 wherein the switch means has a first operative condition and a second operative condition, and said differential module includes lever means responsive to movement of said stem in said one direction to place the switch means in said first operative condition and responsive to movement of said stem in said other direction to place the switch means in said second operative condition, differential means applying a differential force to the lever means at a differential means rest point while said stem is moving in said one direction and removing the differential force from the lever means at said differential means rest point while said stem is moving in said other direction, a first adjustment means for adjusting said differential point, and a second adjustment means for adjusting the differential force.
Claim 7
Dependent Claim
121 words
A pressure responsive device as in claim 3 wherein said differential module comprises a base member, a main lever having end portions and pivotally mounted to said base member at one of said end portions, an operating lever having an end portion and pivotally mounted to said base member with its end portion operatively engaging the other of said end portions of said main lever, cooperating engaging means on said operating lever and switch means to determine operative conditions of said switch means, a differential lever pivotally mounted to said base member and having a rest position between said operating lever and said switch means, and differential spring means applying a differential force biasing said differential lever toward said operating lever.
Claim 8
Dependent Claim
69 words
A pressure responsive device as in claim 5 wherein said cooperating engaging means comprises a reciprocating member mounted on said switch means for controlling the operative conditions of said switch means, and a member mounted on said operating lever and having an end portion positionable a selected distance from said operating lever for operatively engaging said reciprocating member, and wherein said member is adjustable to change said selected distance.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |