Patent US3760132A successfully refreshed from Google Patents.
US3760132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enclosed switch device with cover interlock
Assignee: Westinghouse Electric Corp
•
Filing: 1972-04-19
•
Granted: 1973-09-18
•
Expires: 1992-04-19
Abstract
Abstract A switch device characterized by a switch structure within an enclosure having an openable cover and having interlock means between the switch structure and a handle on the cover for preventing opening of the cover if the contacts of the switch structure are welded in the closed-circuit position.
Inventors
- 👤 J Ellsworth
- 👤 J Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:34
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/20; H01H9/22; H01H71/00; H01H71/10; H01H71/50; H01H71/501
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
206 words
A switch device for controlling an electric circuit comprising a switch structure and an enclosure therefor, said switch structure comprising a stationary contact and a movable contact, a movable switch arm having said movable contact thereon, operating mechanism for said switch arm and comprising an operating lever and a switch handle thereon for manually moving said operating lever, an over-center toggle operable by said operating lever to effect movement of said switch arm to opened and closed circuit positions, said enclosure comprising an openable cover, a second handle on the external side of said cover and having first means comprising a rotatable member for engaging and operating said switch handle, said means disengaging said switch handle when said cover is opened, said second handle being movable between ''''on'''' and ''''off'''' positions to operate said contacts between closed and opened positions, said second handle being biased to said ''''on'''' position by said over-center toggle if said contacts fail to open when said second handle is moved to said ''''off'''' position, and said switch handle having second means comprising a projection engageable with said rotatable member for preventing opening of said cover if said contacts fail to open when said second handle is moved to said ''''off'''' position.
Claim 2
Dependent Claim
206 words
A switch device for controlling an electric circuit comprising a switch structure and an enclosure therefor, said switch structure comprising a stationary contact and a movable contact, a movable switch arm having said movable contact thereon, operating mechanism for said switch arm and comprising an operating lever and a switch handle thereon for manually moving said operating lever, an over-center toggle operable by said operating lever to effect movement of said switch arm to opened and closed circuit positions, said enclosure comprising an openable cover, a second handle on the external side of said cover and having first means comprising a rotatable member for engaging and operating said switch handle, said means disengaging said switch handle when said cover is opened, said second handle being movable between ''''on'''' and ''''off'''' positions to operate said contacts between closed and opened positions, said second handle being biased to said ''''on'''' position by said over-center toggle if said contacts fail to open when said second handle is moved to said ''''off'''' position, and said switch handle having second means comprising a projection engageable with said rotatable member for preventing opening of said cover if said contacts fail to open when said second handle is moved to said ''''off'''' position.
Claim 3
Dependent Claim
26 words
The switch device of claim 1 in which said projection is on said side of said switch handle facing said ''''on'''' position of said switch handle.
Claim 4
Dependent Claim
67 words
The switch device of claim 2 in which said rotatable member comprises a strike surface, said projection is disposed on the side of said switch handle adjacent to said strike surface and said projection is disposed in the path of movement of said strike surface when said cover is opened and when said contacts fail to open when said second handle is moved to said ''''off'''' position.
Claim 5
Dependent Claim
31 words
The switch device of claim 3 in which said rotatable member comprises aperture means through which said switch handle extends, and said strike surface defines one side of said aperture means.
Claim 6
Dependent Claim
30 words
The switch device of claim 4 in which said rotatable member also comprises a second strike surface engageable with said switch handle for moving said handle to said ''''on'''' position.
Claim 7
Dependent Claim
68 words
The switch device of claim 4 in which said rotatable member comprises two arm portions defining a notch into which said switch handle extends and in which one arm portion comprises said strike surface and said other arm portion comprises a second strike surface and said strike surfaces being engageable with opposite sides of said switch handle foR moving said switch handle between said ''''on'''' and ''''off'''' positions.
Claim 8
Dependent Claim
90 words
The switch device of claim 1 in which said rotatable member has opposed strike surfaces forming an aperture, said switch handle extending into said aperture when said cover is closed, said switch handle including a projection facing said ''''on'''' position, said handle being biased to said ''''on'''' position if said contacts fail to open when said second handle is moved to said ''''off'''' position, and said projection being located in the path of movement of said strike surface on said ''''on'''' side of said handle when said cover is opened.
References Cited (Backward Citations)
US3609261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |