US3676619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manual override pressure operated switch
Assignee: Burns Machine Co
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Filing: 1970-12-14
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Granted: 1972-07-11
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Expires: 1990-12-14
Abstract
Abstract Pressure operated switch in which an expansible bellows actuates a switch arm in a switch operating direction upon predetermined pressure conditions and a manually operable plunger is guided to engage and actuate the switch arm independently of the bellows, to effect operation of the switch arm manually. A latching member engaged with the plunger holds the switch arm in a switch closing position and is released by operation of the bellows when moving the switch arm in a switch closing direction.
Inventors
- 👤 Melvin S Hook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:45
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
266 words
In a manual override pressure switch, a housing, a switch base in said housing, a switch mounted on said base and including a casing having a depressible switch button extending therefrom, a switch arm movably mounted on said base and extending over said switch button and operable to depress said button and effect a circuit connection, an actuating arm overlying said switch arm and adapted to have engagement therewith, an extensible pressure member mounted in said housing and having engagement with said actuator arm for moving said actuator arm and switch arm in a direction to depress said switch button upon predetermined pressure conditions, yieldable means having connection with said actuating arm for retracting said actuating arm and said extensible pressure member upon predetermined reductions in pressure, a manually operable override plunger having direct engaging connection with said switch arm and guided for movement toward and from said switch arm and operable to manually move said switch arm to depress said switch button independently of said extensible pressure member, spring means biasing said plunger into a release position relative to said switch arm, a latch member locking said manual override plunger in position to hold said switch arm to maintain said switch button depressed, yieldable means having connection with said actuating arm for retracting said actuating arm and said extensible pressure member upon predetermined reductions in pressure, and said actuating arm having engagement with said latch member when moving in a switch button depressing direction, to effect release of said latch member and retractable movement of said plunger, as said switch button is depressed by pressure.
Claim 2
Dependent Claim
266 words
In a manual override pressure switch, a housing, a switch base in said housing, a switch mounted on said base and including a casing having a depressible switch button extending therefrom, a switch arm movably mounted on said base and extending over said switch button and operable to depress said button and effect a circuit connection, an actuating arm overlying said switch arm and adapted to have engagement therewith, an extensible pressure member mounted in said housing and having engagement with said actuator arm for moving said actuator arm and switch arm in a direction to depress said switch button upon predetermined pressure conditions, yieldable means having connection with said actuating arm for retracting said actuating arm and said extensible pressure member upon predetermined reductions in pressure, a manually operable override plunger having direct engaging connection with said switch arm and guided for movement toward and from said switch arm and operable to manually move said switch arm to depress said switch button independently of said extensible pressure member, spring means biasing said plunger into a release position relative to said switch arm, a latch member locking said manual override plunger in position to hold said switch arm to maintain said switch button depressed, yieldable means having connection with said actuating arm for retracting said actuating arm and said extensible pressure member upon predetermined reductions in pressure, and said actuating arm having engagement with said latch member when moving in a switch button depressing direction, to effect release of said latch member and retractable movement of said plunger, as said switch button is depressed by pressure.
Claim 3
Dependent Claim
97 words
The manual override pressure switch of claim 1, wherein a latching member extends along said plunger and has a loose connection with said plunger, to accommodate tilting of said latching member relative to said plunger, wherein a stop engages said latching member at one side thereof, and wherein a spring connected between said switch arm and latch member and biases said latch member into engagement with said stop, and effects cocking thereof about said stop to wedgingly engage said plunger upon movement of said switch arm by said plunger in a direction to depress said switch button.
Claim 4
Dependent Claim
48 words
The manual override pressure switch of claim 2, wherein the latch member is in the form of a rectangular plate having a central opening therein extending along said plunger, and wherein guide means are slidably engaged by said plate, to hold said plate from rotation about said plunger.
Claim 5
Dependent Claim
77 words
The manual override pressure switch of claim 1, wherein the switch arm and actuating arm are pivotally movable about a common pivot pin, wherein a C spring retains said arms to said pin and biases said switch arm in a direction to release said plunger, wherein the extensible pressure member is a bellows. whErein spring means bias said actuating arm into engagement with said bellows to retractably move said bellows and actuating arm to a return position.
Claim 6
Dependent Claim
96 words
The manual override pressure switch of claim 4, wherein the latch member extends along said plunger and has loose connection therewith, accommodating tilting of said latch member relative to said plunger, wherein a stop is provided in position to engage one side of said latch member, and wherein spring means interposed between said switch arm and latch member bias said latch member into engagement with said stop, to tilt said latch member relative to said plunger and retain said plunger in a switch closing position until positive release of said latch member by said actuating arm.
Claim 7
Dependent Claim
99 words
The manual override pressure switch of claim 5, wherein the latch member is in the form of a rectangular plate having a central opening therein through which said plunger extends and of a larger diameter than the diameter of said plunger, and wherein the spring means encircle said plunger and bias said plate into engagement with said stop and effect cocking of said plate relative to said stop to frictionally engage said plunger and hold said plunger in a switch closing position until released by movement of said actuating arm in a direction to close said switch by power.
Claim 8
Dependent Claim
89 words
The manual override pressure switch of claim 6, wherein the means guiding the override plunger comprises a guide member having an open portion through which said plunger slidably extends, and having one end portion extending over said actuating arm and forming a stop therefor limiting movement of said actuating arm in a release direction, and another portion extending from its end opposite said actuating arm downwardly and inwardly and having an end portion disposed beneath the plane of said guide member and forming a stop for said latch member.
Claim 9
Dependent Claim
72 words
The manual override pressure switch of claim 7, wherein a leg extending from said guide member underlies said switch arm and is positioned to limit movement of said switch arm in a switch closing direction upon operation of said actuating member by said bellows, wherein the spring biasing said actuating member into engagement with said bellows is a tension spring, and wherein means are provided for adjusting the tension of said spring.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |