US3783209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanism for holding and levering large draw out type circuit breakers
Assignee: Westinghouse Electric Corp
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Filing: 1972-10-31
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Granted: 1974-01-01
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Expires: 1992-10-31
Abstract
Abstract A levering and holding device is provided for positioning large circuit breakers in a switchgear compartment or cell. The levering and holding device comprises a box beam which can be secured to the cell walls and a rotatable threaded shaft which is connected to the beam. A threaded shaft has a nut threaded thereon and has one end fixed to the beam. The thread shaft may be rotated with a crank. The breaker is attached to the nut, and as the shaft is rotated, the nut is moved along the shaft and moves the breaker into position. Interlocks are provided to prevent the breaker from being levered into the cell when the beam is not engaged in the cell wall and to prevent the beam from being disengaged from the cell wall unless the breaker is in a fully disengaged position. Another interlock is provided so that when the breaker is closed and in the operating position the threaded shaft cannot be rotated to lever out the breaker.
Inventors
- 👤 C Cleaveland
- 👤 F Bould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:30
CPC Classifications
H; H02; H02B; H02B11/00; H02B11/12; H02B11/127; H02B11/133
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
268 words
Electric switchgear comprising a cell, a circuit breaker unit movable into and out of said cell, said circuit breaker unit comprising an electric circuit breaker, holding means for securing said circuit breaker unit to said cell, levering means for moving said electric circuit breaker between a first disconnected position in said cell and a second connected position in said cell, said levering means comprising a nut rigidly attached to said electric circuit breaker, a threaded shaft passing through said nut and attached to said holding means, retaining means for attaching said threaded shaft to said holding means to permit rotary movement of said threaded shaft while restricting longitudinal movement of said threaded shaft, said nut being in threaded engagement with said rotatable shaft for movement along said shaft as said shaft is rotated whereby said circuit breaker is moved between said first and said second position within said cell as said shaft is rotated, and wherein said holding means comprising a box beam extending generally across the front of said circuit breaker unit, locking members disposed in proximity to the ends of said box beam and being mounted for movement between a retracted position where said locking members are contained internal of said beam and an engaged position where said locking members lock into said cell and securely connect said box beam to said cell, a flat member, a handle connected to said flat member for simultaneous movement, linking means connecting said locking members to said flat member so that when said handle is rotated said locking members are moved between said retracted position and said engaged position.
Claim 2
Dependent Claim
268 words
Electric switchgear comprising a cell, a circuit breaker unit movable into and out of said cell, said circuit breaker unit comprising an electric circuit breaker, holding means for securing said circuit breaker unit to said cell, levering means for moving said electric circuit breaker between a first disconnected position in said cell and a second connected position in said cell, said levering means comprising a nut rigidly attached to said electric circuit breaker, a threaded shaft passing through said nut and attached to said holding means, retaining means for attaching said threaded shaft to said holding means to permit rotary movement of said threaded shaft while restricting longitudinal movement of said threaded shaft, said nut being in threaded engagement with said rotatable shaft for movement along said shaft as said shaft is rotated whereby said circuit breaker is moved between said first and said second position within said cell as said shaft is rotated, and wherein said holding means comprising a box beam extending generally across the front of said circuit breaker unit, locking members disposed in proximity to the ends of said box beam and being mounted for movement between a retracted position where said locking members are contained internal of said beam and an engaged position where said locking members lock into said cell and securely connect said box beam to said cell, a flat member, a handle connected to said flat member for simultaneous movement, linking means connecting said locking members to said flat member so that when said handle is rotated said locking members are moved between said retracted position and said engaged position.
Claim 3
Dependent Claim
88 words
The switchgear apparatus of claim 1 including a crank for engaging the end of said threaded lead screw retained by said holding means, an opening in said box beam for inserting said crank, an opening in said flat member through which said crank passes to engage said lead screw, said opening in said box beam and said opening in said flat member being in alignment so that said crank may pass therethrough only when said handle is positioned so that said locking members are in the engaged position.
Claim 4
Dependent Claim
66 words
Switchgear as claimed in claim 2 where said lead screw member contains a stopping means so that when said lead screw is rotated clockwise to move said electric circuit breaker from said first position to said second position and when said electric circuit breaker is in said second position said nut engages said stop means and further clockwise rotation of said lead screw is not prevented.
Claim 5
Dependent Claim
91 words
Electric switchgear as claimed in claim 1 including an interlock for preventing movement of said handle when said electric circuit breaker is moved from said first position in which said electric circuit breaker is flush with said box beam, said interlock comprising a spring loaded pin which engages an opening in said flat member when said electric circuit breaker is spaced from said box beam, and a stud mounted on said electric circuit breaker to disengage said spring bias pin when said electric circuit breaker is flush with said box beam.
Claim 6
Dependent Claim
70 words
Electric switchgear as claimed in claim 1 including interlocking means for preventing rotation of said lead screw when said electric circuit breaker is closed and in said second position, said interlock comprising a cup-shaped portion having slots therein rigidly attached to the end of said lead screw, a spring loaded rod to engage the slots in said cup-shaped portion when said circuit breaker is closed and in said second position.
Claim 7
Dependent Claim
19 words
Switchgear as claimed in claim 5 wherein said lead screw, said nut stop and said cup-shaped portion are integral.
Claim 8
Dependent Claim
178 words
Electric switchgear comprising: a cell; a circuit interrupter unit movable into and out of said cell; said circuit interrupter unit comprising an electric circuit breaker, holDing means for securing said circuit interrupter unit to said cell, levering means for moving said electric circuit breaker between a first disconnected position in said cell and a second connected position in said cell; said levering means comprising a nut attached to said electric circuit breaker, a threaded shaft passing through said nut and attached to said holding means, retaining means for attaching said threaded shaft to said holding means to permit rotary movement of said threaded shaft while restricting longitudinal movement of said threaded shaft with respect to said cell so that said threaded shaft is maintained a fixed distance from the front of said cell; and, said nut being in threaded engagement with said threaded shaft for movement along said threaded shaft as said threaded shaft is rotated whereby said electric circuit breaker is moved between said first and said second position within said cell as said shaft is rotated.
Claim 9
Dependent Claim
178 words
Electric switchgear comprising: a cell; a circuit interrupter unit movable into and out of said cell; said circuit interrupter unit comprising an electric circuit breaker, holDing means for securing said circuit interrupter unit to said cell, levering means for moving said electric circuit breaker between a first disconnected position in said cell and a second connected position in said cell; said levering means comprising a nut attached to said electric circuit breaker, a threaded shaft passing through said nut and attached to said holding means, retaining means for attaching said threaded shaft to said holding means to permit rotary movement of said threaded shaft while restricting longitudinal movement of said threaded shaft with respect to said cell so that said threaded shaft is maintained a fixed distance from the front of said cell; and, said nut being in threaded engagement with said threaded shaft for movement along said threaded shaft as said threaded shaft is rotated whereby said electric circuit breaker is moved between said first and said second position within said cell as said shaft is rotated.
Claim 10
Dependent Claim
136 words
Electric switchgear comprising: a cell; a circuit breaker movable into and out of said cell; a nut secured to said circuit breaker; an elongated shaft having a threaded portion in engagement with said nut; a beam attached to the front of said circuit breaker; locking means connected to said beam to securely fasten said beam to said cell when said circuit breaker is disposed in said cell; retaining means for connecting said elongated shaft to said beam to permit rotary movement of said shaft while restricting longitudinal movement of said shaft so that when said locking means fasten said beam to said cell and said elongated shaft is rotated said elongated shaft is maintained a fixed distance from the front of said cell while said circuit breaker is moved relative to the front of said cell.
Claim 11
Dependent Claim
136 words
Electric switchgear comprising: a cell; a circuit breaker movable into and out of said cell; a nut secured to said circuit breaker; an elongated shaft having a threaded portion in engagement with said nut; a beam attached to the front of said circuit breaker; locking means connected to said beam to securely fasten said beam to said cell when said circuit breaker is disposed in said cell; retaining means for connecting said elongated shaft to said beam to permit rotary movement of said shaft while restricting longitudinal movement of said shaft so that when said locking means fasten said beam to said cell and said elongated shaft is rotated said elongated shaft is maintained a fixed distance from the front of said cell while said circuit breaker is moved relative to the front of said cell.
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |