US3610853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latching pressure differential switch with reset plunger
Assignee: Bendix Corp
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Filing: 1970-01-05
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Granted: 1971-10-05
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Expires: 1990-01-05
Abstract
Abstract A differential pressure warning switch for use in a vehicular braking system to indicate a malfunction thereof has a latching mechanism engaging the switch arm so that, when activated, the warning device remains activated after the brakes are released. When the malfunction is corrected, the mechanic moves a plunger extending from the housing to return the switch arm to its unactivated position.
Inventors
- 👤 Raymond A Reznicek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:59
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/226; H; H01; H01H; H01H35/00; H01H35/24; H01H35/38
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
In a switch responsive to differential pressure between first and second hydraulic systems: a housing defining a bore therewithin; a piston in said bore having a pair of opposed faces; first and second chambers in said bore defined by respective faces on the piston and corresponding ends of the bore; said first and second chambers being in fluid communication with said first and second hydraulic systems, respectively; said piston being slidable in said bore in response to a pressure differential between said first and second chambers; a switch arm carried by the housing extending into said bore and adapted to activate a warning signal mechanism upon displacement of the switch arm by said piston from a base position to an actuated position; latch means engaging said arm when moved to said actuated position for maintaining the latter in said actuated position; and a plunger projecting from said housing cooperating with said switch arm to move the latter from the actuated position to the base position upon movement of said plunger.
Claim 2
Dependent Claim
170 words
In a switch responsive to differential pressure between first and second hydraulic systems: a housing defining a bore therewithin; a piston in said bore having a pair of opposed faces; first and second chambers in said bore defined by respective faces on the piston and corresponding ends of the bore; said first and second chambers being in fluid communication with said first and second hydraulic systems, respectively; said piston being slidable in said bore in response to a pressure differential between said first and second chambers; a switch arm carried by the housing extending into said bore and adapted to activate a warning signal mechanism upon displacement of the switch arm by said piston from a base position to an actuated position; latch means engaging said arm when moved to said actuated position for maintaining the latter in said actuated position; and a plunger projecting from said housing cooperating with said switch arm to move the latter from the actuated position to the base position upon movement of said plunger.
Claim 3
Dependent Claim
130 words
The invention of claim 1: said housing having an opening extending into said bore; said switch arm having an enlarged portion pivotally carried on the housing at said opening, a first elongated portion extending through said opening into said bore for engagement by the piston, a second elongated portion extending away from said bore; said latch means being a camming surface on said plunger in said housing engaging said second portion and adapted to retain said switch arm in the actuated position; spring means yieldably biasing said plunger into engagement with said switch arm; and resilient means engaging said second portion adapted to return said arm to the base position when said plunger is manually moved against the bias of said spring means out of contact with said second portion.
Claim 4
Dependent Claim
109 words
The invention of claim 1: said housing having an opening extending into said bore; said switch arm having an enlarged portion pivotally carried on the housing at said opening, a first elongated portion extending through said opening into said bore for engagement by the piston, a second elongated portion extending away from said bore; said latch means being a resilient member carried by the housing; said member having a detent adapted to engage a recess in said enlarged portion to lock the arm in said base position until shifted to said actuated position by movement of the piston, whereupon the member releasably maintains the arm in the actuated position.
Claim 5
Dependent Claim
58 words
The invention of claim 3: said plunger having a camming surface thereon adapted to engage said switch arm; spring means in the housing yieldably biasing said plunger away from said switch arm; said camming surface being adapted to force the switch arm to the base position when said plunger is moved against the action of the spring means.
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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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |