Patent US3875355A successfully refreshed from Google Patents.
US3875355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disconnect switch
Assignee: ABB Inc USA
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Filing: 1973-09-11
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Granted: 1975-04-01
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Expires: 1993-09-11
Abstract
Abstract A high voltage disconnect switch in which the hinged member pivotally supporting the switch blade is composed of aluminum alloy, the sleeve for rotating the blade is composed of copper alloy with copper alloy conductors on opposite sides of the contact surface of the sleeve, and the circuit through the switch passing through the sleeve and conductors rather than through the hinged member.
Inventors
- 👤 Russell E Frink
- 👤 Stanislaw A Milianowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:41
CPC Classifications
H; H01; H01H; H01H31/00; H01H31/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
A disconnect switch comprising a pair of stationary contacts at spaced locations, a switch blade pivotally movable between open and closed positions with one of the stationary contacts, means for pivotally mounting the switch blade at a location spaced from one of the stationary contacts and comprising a stationary frame, the other stationary contact being electrically connected to the stationary frame, the stationary frame supporting a movable sleeve in which the blade is rotatably mounted, rotating means rotating the blade in the sleeve when the blade is pivotally moved between the open and closed positions, the rotating means comprising a rotatable sleeve in which the switch blade is disposed and which is rotatably mounted in the movable sleeve, a clamping sleeve within the switch blade for holding the switch blade in tight electrical contact with the rotatable sleeve, the outer surface of the rotatable sleeve having an oval cross-section, and conductor means mounted on the stationary frame and positioned externally of the clamping sleeve for engagement and disengagement with said oval cross-section of the rotatable sleeve when the blade is in the closed and open positions, respectively.
Claim 2
Dependent Claim
187 words
A disconnect switch comprising a pair of stationary contacts at spaced locations, a switch blade pivotally movable between open and closed positions with one of the stationary contacts, means for pivotally mounting the switch blade at a location spaced from one of the stationary contacts and comprising a stationary frame, the other stationary contact being electrically connected to the stationary frame, the stationary frame supporting a movable sleeve in which the blade is rotatably mounted, rotating means rotating the blade in the sleeve when the blade is pivotally moved between the open and closed positions, the rotating means comprising a rotatable sleeve in which the switch blade is disposed and which is rotatably mounted in the movable sleeve, a clamping sleeve within the switch blade for holding the switch blade in tight electrical contact with the rotatable sleeve, the outer surface of the rotatable sleeve having an oval cross-section, and conductor means mounted on the stationary frame and positioned externally of the clamping sleeve for engagement and disengagement with said oval cross-section of the rotatable sleeve when the blade is in the closed and open positions, respectively.
Claim 3
Dependent Claim
60 words
The disconnect switch of claim 1 in which the rotatable sleeve comprises a rotatable contact rotatable on the axis of the blade, the contact having long and short axis in a plane that is substantially normal to the blade, and the long axis engaging the conductor means when the blade is in the closed position with said one stationary contact.
Claim 4
Dependent Claim
60 words
The disconnect switch of claim 2 in which the conductor means comprises conductors disposed On opposite sides of the rotatable contact and engageable with the peripheral portions at the long axis of the contact and non-engageable with the peripheral portions at the short axis of the contact when the blade is in the open position with said one stationary contact.
Claim 5
Dependent Claim
43 words
The disconnect switch of claim 3 in which the peripheral portions of the rotatable contact are covered with a cladding of silver and in which the portions of the conductor structures engageable with the rotatable contact are covered with a cladding of silver.
Claim 6
Dependent Claim
51 words
The disconnect switch of claim 1, in which the stationary frame comprises a first yoke, a second yoke rotatably mounted in the first yoke and comprising said movable sleeve, and the blade being rotatable in the sleeve on an axis substantially normal to the axis of rotation of the second yoke.
Claim 7
Dependent Claim
31 words
The disconnect switch of claim 5 in which the conductor means comprises conductors disposed on opposite sides of the rotatable sleeve, and the conductors and rotatable sleeve being composed of copper.
Claim 8
Dependent Claim
23 words
The disconnect switch of claim 6 in which the contacting areas of the rotatable sleeve and conductors means are covered with silver cladding.
Claim 9
Dependent Claim
48 words
The disconnect switch of claim 6 in which the joint between the engaging surfaces of the rotatable sleeve and the blade is coated with a conducting grease, and in which the rotatable sleeve is composed of a copper alloy and the blade is composed of an aluminum alloy.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |