Patent US4652708A successfully refreshed from Google Patents.
US4652708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tank-type switchgear
Assignee: Mitsubishi Electric Corp
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Filing: 1985-10-09
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Granted: 1987-03-24
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Expires: 2005-10-09
Abstract
Abstract A tank-type switchgear comprises a main contact disposed in a hollow tank and having movable and stationary contact elements, an auxiliary contact disposed in the tank and electrically connected parallel with the main contact and having movable and stationary contact elements, a main lever rotatably connected to the movable contact element of the main contact, an auxiliary lever rotatably connected at one end thereof to the movable contact element of the auxiliary contact, a connecting link for rotatably supporting the other end of the auxiliary lever, a device for rotatably supporting the main lever and the connecting link with respect to the tank, and a driving device for rotating the main lever. The auxiliary lever is rotatably connected to the main lever such that the auxiliary lever rotates in the direction opposite the rotational direction of the main lever.
Inventors
- 👤 Michiharu Okuno
- 👤 Tsutomu Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:51
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/12; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H01H3/00; H01H3/32; H01H3/46
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A tank-type switchgear comprising; a main contact disposed in a hollow tank and having movable and stationary contact elements; an auxiliary contact which is disposed in the tank and which is electrically connected parallel with the main contact and which has movable and stationary contact elements; a main lever rotatably connected to the movable contact element of the main contact; an auxiliary lever rotatably connected at one end thereof to the movable contact element of the auxiliary contact; a connecting link for rotatably supporting the other end of the auxiliary lever; means for rotatably supporting the main lever and the connecting link with respect to the tank; and driving means for rotating the main lever; said auxiliary lever being rotatably connected to the main lever such that the auxiliary lever rotates in the direction opposite the rotational direction of the main lever.
Claim 2
Dependent Claim
142 words
A tank-type switchgear comprising; a main contact disposed in a hollow tank and having movable and stationary contact elements; an auxiliary contact which is disposed in the tank and which is electrically connected parallel with the main contact and which has movable and stationary contact elements; a main lever rotatably connected to the movable contact element of the main contact; an auxiliary lever rotatably connected at one end thereof to the movable contact element of the auxiliary contact; a connecting link for rotatably supporting the other end of the auxiliary lever; means for rotatably supporting the main lever and the connecting link with respect to the tank; and driving means for rotating the main lever; said auxiliary lever being rotatably connected to the main lever such that the auxiliary lever rotates in the direction opposite the rotational direction of the main lever.
Claim 3
Dependent Claim
64 words
A tank-type switchgear as claimed in claim 1, wherein said main lever is an L-shaped member and one leg of the main lever is rotatably connected to the driving means and the other leg of the main lever is connected to the movable contact element of the main contact, and said auxiliary lever is rotatably connected to the main lever by a connecting pin.
Claim 4
Dependent Claim
45 words
A tank-type switchgear as claimed in claim 2, wherein said supporting means comprises a box disposed inside and secured to the tank, the main and auxiliary levers being disposed in the box, the main lever and the connecting link being rotatably supported by the box.
Claim 5
Dependent Claim
28 words
A tank-type switchgear as claimed in claim 3, wherein the main lever and the connecting link are each rotatably supported by a stationary shaft secured to the box.
Claim 6
Dependent Claim
27 words
A tank-type switchgear as claimed in claim 2, wherein the auxiliary lever is rotatably connected midway along its length to the other leg of the main lever.
Claim 7
Dependent Claim
47 words
A tank-type switchgear as claimed in claim 2, wherein said main and auxiliary levers are respectively rotatably connected to the movable contact elements of the main and auxiliary contacts through connecting links, and the main lever is rotatably connected to the driving means through a connecting link.
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) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |