US3566060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive switch with improved diaphragm operating means
Assignee: F W DWYER Mfg CO Inc
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Filing: 1968-06-07
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Granted: 1971-02-23
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Expires: 1988-06-07
Abstract
Abstract A differential pressure-sensitive microelectric switch of low profile made possible by placing both high and low pressure connections on the same side of a flexible diaphragm and utilizing a range spring mounted to undergo tension and contraction in a direction perpendicular to the motion of the diaphragm. The spring is connected to the short arm of a bellcrank lever, the longer arm of which is engaged by the diaphragm and in turn operates the switch. Because of the leverage, the spring travel is small as compared to diaphragm and switch operating arm travel. By providing annular grooves in the housing members on each side of the diaphragm, aligned with passageways through the rim of the diaphragm and by providing a passageway from the high pressure connection to the groove on the same side of the diaphragm as the connection, the unit can be assembled without the necessity of lining up the parts of the device.
Inventors
- 👤 James W Phillips
- 👤 Richard S Zoludow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:23
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34; H01H35/26; H01H35/2607; H01H35/2614
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
In a low profile differential pressure sensitive electric switch wherein a flexible diaphragm is mountEd in a housing with means for applying low pressure on one side and high pressure on the other side of the diaphragm and means activated by the diaphragm for opening and closing an electric switch, the improvement wherein said activating means comprises: a bellcrank pivotally mounted in said housing, one arm of said crank being substantially longer than the other arm thereof and extending in a direction generally parallel to said diaphragm; calibrated range spring means positioned in said housing; said spring means comprising a coil spring, the axis of which is perpendicular to the axis of movement of the diaphragm; one end of said spring engaging the shorter arm of said crank and the other end of said spring being engaged by means for adjusting the tension or compression of said spring; with the longer arm of said crank being in operative engagement with the diaphragm and the switch.
Claim 2
Dependent Claim
165 words
In a low profile differential pressure sensitive electric switch wherein a flexible diaphragm is mountEd in a housing with means for applying low pressure on one side and high pressure on the other side of the diaphragm and means activated by the diaphragm for opening and closing an electric switch, the improvement wherein said activating means comprises: a bellcrank pivotally mounted in said housing, one arm of said crank being substantially longer than the other arm thereof and extending in a direction generally parallel to said diaphragm; calibrated range spring means positioned in said housing; said spring means comprising a coil spring, the axis of which is perpendicular to the axis of movement of the diaphragm; one end of said spring engaging the shorter arm of said crank and the other end of said spring being engaged by means for adjusting the tension or compression of said spring; with the longer arm of said crank being in operative engagement with the diaphragm and the switch.
Claim 3
Dependent Claim
87 words
A differential pressure sensitive electric switch in accordance with claim 1 in which: said adjusting means comprises a threaded element rotatably mounted in and operable from the exterior of said housing; a nut threadedly received on said element; said nut being mounted for movement longitudinally of said element; means for restraining said nut against rotational movement on rotation of said element; and means for securing said other end of said spring to said nut; the axis of said element being substantially coincident with that of the spring.
Claim 4
Dependent Claim
102 words
A differential pressure sensitive switch in accordance with claim 1 in which: said housing being provided with low and high pressure connections on the same side of said diaphragm; said diaphragm having at least one passageway through the rim thereof; one of said connections communicating with the passageway through the diaphragm rim; means being provided for clamping said diaphragm rim in fluidtight relationship between the top and bottom of said housing; and means being provided for communicating the space on the side of the diaphragm opposite the side on which said inlet and outlet are placed, with said passageway in said rim.
Claim 5
Dependent Claim
103 words
A differential pressure sensitive switch in accordance with claim 3 in which: said means for communicating said passageway through the rim of said diaphragm with one of said connections includes an annular groove in the surface of the top and bottom housing members between which the rim of the diaphragm is clamped; said passageway communicating between said grooves. 5 A differential pressure sensitive switch in accordance with claim 4 in which: the annular groove in the housing member on which said connections are not mounted, is connected by at least one radially directed passageway to the space between the diaphragm and said member.
Claim 6
Dependent Claim
40 words
A differential pressure sensitive switch in accordance with claim 5 in which: the rim of the diaphragm is clamped in fluidtight relationship between the top and bottom housing members inwardly of the location of said passageway in the diaphragm rim.
Claim 7
Dependent Claim
46 words
A differential pressure sensitive switch in accordance with claim 6 in which: there are a plurality of spaced passageways in the rim of said diaphragm; and a plurality of spaced radially directed passageways connecting the annular groove to the space between the diaphragm and housing member.
Claim 8
Dependent Claim
51 words
A differential pressure sensitive switch in accordance with claim 3 in which: said spring means is a coil spring the axis of which is perpendicular to the axis of the diaphragm; and the other end of said spring is engaged by means for adjusting the tension or compression of said spring.
Claim 9
Dependent Claim
48 words
A differential pressure sensitive switch in accordance with claim 8 in which: said adjusting means is a threaded element operable from the exterior of said housing, the axis of said element being substantially coincident with that of the spring, said threaded element being movable axially in opposite directions.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |