US3553402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure switch with improved diaphragm and snap action disc structure
Assignee: Fasco Controls Corp
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Filing: 1968-07-23
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Granted: 1971-01-05
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Expires: 1988-07-23
Abstract
Abstract Two male terminals project from the closed end of a cup-shaped, dielectric switch housing; and a flexible diaphragm is secured over the opposite, open end of the housing for operation by a fluid pressure system. A bowed metal disc in the housing engages the diaphragm, so that upon predetermined increase in pressure in the fluid pressure system, the disc is snapped suddenly by the diaphragm to cause a spring-loaded, dielectric plunger to move a metal contact into contact with the male terminals. The spring pressure on the plunger is adjustable by a screw to adjust the reset pressure of the switch after it has been tripped, or in some cases to adjust the range or differential switch.
Inventors
- 👤 Charles John Hire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:17
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34; D; D06; D06B; D06B21/00; D06B5/00; H01H35/26; H01H35/2607; H01H35/2614; D06B2700/00; D06B2700/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
218 words
A pressure-responsive switch, comprising: a dielectric, generally cup-shaped member open at one end and having a shallow counterbore in said open end to form an internal shoulder, and having a pair of electrically conductive terminals projecting from its closed end; an electrical contact in said housing movable between first and second positions electrically to connect and disconnect, respectively, said terminals; a spring urging said contact to one of its two positions; a flexible diaphragm secured around its marginal edge over the open end of said member; a snap-action metal disc mounted on said shoulder between said contact and said diaphragm, said disc having its marginal edge movably seated on said shoulder, and being normally bowed at its center outwardly away from said contact into engagement with the center of said diaphragm; a coupling secured to said member to hold said diaphragm on said member and having an axial bore for admitting fluid under pressure against one side of said diaphragm, so that upon a predetermined increase in the pressure of said fluid, said diaphragm and said disc will be snapped suddenly inwardly in the direction of said contact; and a plug interposed between said disc and said contact, and responsive to the sudden snapping of said disc to move said contact from said one to its other position.
Claim 2
Dependent Claim
218 words
A pressure-responsive switch, comprising: a dielectric, generally cup-shaped member open at one end and having a shallow counterbore in said open end to form an internal shoulder, and having a pair of electrically conductive terminals projecting from its closed end; an electrical contact in said housing movable between first and second positions electrically to connect and disconnect, respectively, said terminals; a spring urging said contact to one of its two positions; a flexible diaphragm secured around its marginal edge over the open end of said member; a snap-action metal disc mounted on said shoulder between said contact and said diaphragm, said disc having its marginal edge movably seated on said shoulder, and being normally bowed at its center outwardly away from said contact into engagement with the center of said diaphragm; a coupling secured to said member to hold said diaphragm on said member and having an axial bore for admitting fluid under pressure against one side of said diaphragm, so that upon a predetermined increase in the pressure of said fluid, said diaphragm and said disc will be snapped suddenly inwardly in the direction of said contact; and a plug interposed between said disc and said contact, and responsive to the sudden snapping of said disc to move said contact from said one to its other position.
Claim 3
Dependent Claim
65 words
A switch as defined in claim 1, wherein: said plug is made of a dielectric material; said contact is secured to said plug for movement therewith; and said Spring is a compression spring mounted in said member between one end thereof and said plug, and is operatively connected to said plug to urge the latter and said contact resiliently in the direction of said disc.
Claim 4
Dependent Claim
136 words
A switch as defined in claim 1, wherein: said terminals are secured in said member with the inner ends thereof bent toward and spaced from one another; said plug has a reduced diameter shank portion extending between the inwardly bent ends of said terminals, and an enlarged diameter head portion positioned between said disc and said inwardly bent ends and overlying the latter; said contact is mounted on said plug to extend transversely between said terminals with opposite ends thereof overlying, and registering with, said inner ends of said terminals; and said plug is mounted for limited reciprocation by said spring and said disc between a closed position in which said contact thereon engages both said inner ends, and an open position in which said contact is disengaged from at least one of said inner ends.
Claim 5
Dependent Claim
45 words
A switch as defined in claim 3, wherein: said plug has a transverse member secured thereto made of a dielectric material; and said contact is secured to said enlarged head portion of said plug normally to be disposed in spaced, confronting relation to said terminals.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |