Patent US4029924A successfully refreshed from Google Patents.
US4029924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact block interlock for electric switch
Assignee: Westinghouse Electric Corp
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Filing: 1975-09-16
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Granted: 1977-06-14
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Expires: 1995-09-16
Abstract
Abstract An electric switch characterized by at least two contact blocks stacked in end-to-end surface abutment, which blocks comprise movable contacts and means for moving the same, and interlock means interconnecting adjacent blocks against longitudinal separation.
Inventors
- 👤 Stanley L. Frank
- 👤 Stephen S. Dobrosielski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:06
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/50; H01H13/503
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
An electric switch asembly comprising at least two contact blocks stacked in end-to-end surface abutment and on a longitudinal axis, each contact block having stationary and movable contacts, each block also having movable contact operating means including a guided reciprocable plunger, the plunger in each block being in end-to-end abutment with the plunger of an adjacent block, manual means adjacent to one block and operatively connected to the plunger thereof, interlock means interconnecting adjacent blocks against longitudinal movement and comprising elongated hook-like members on one block detachably engaged with projections on another adjacent block, each reciprocable plunger being biased in a desired position by a pair of springs operatively connected thereto, and each spring having one outturned end portion bearing against the block and having another outturned end portion bearing against the plunger.
Claim 2
Dependent Claim
133 words
An electric switch asembly comprising at least two contact blocks stacked in end-to-end surface abutment and on a longitudinal axis, each contact block having stationary and movable contacts, each block also having movable contact operating means including a guided reciprocable plunger, the plunger in each block being in end-to-end abutment with the plunger of an adjacent block, manual means adjacent to one block and operatively connected to the plunger thereof, interlock means interconnecting adjacent blocks against longitudinal movement and comprising elongated hook-like members on one block detachably engaged with projections on another adjacent block, each reciprocable plunger being biased in a desired position by a pair of springs operatively connected thereto, and each spring having one outturned end portion bearing against the block and having another outturned end portion bearing against the plunger.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |