US3562465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic switch for isolated phase bus
Assignee: ITE Circuit Breaker Canada Ltd
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Filing: 1968-10-21
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Granted: 1971-02-09
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Expires: 1988-10-21
Abstract
Abstract A telescopic switch for an isolated phase bus system is disclosed. The switch includes a hollow cylindrical blade which resides within one section of hollow bus and telescopes between first and second positions to engage and disengage, respectively, the jaw contacts on a second section of the bus. The mechanism for moving the blade includes a gear reduction assembly located substantially internally of the bus which houses the hollow blade. The gear reduction assembly includes a driven gear connected to an external driving shaft through an insulator, and a driving gear linked to the blade in a dead center crank arrangement to achieve high mechanical advantage at the end of the closing stroke. A single external drive shaft is connected in tandem through insulators to the gearing assembly of each of the phases whereby the telescopic switches of all phases may be operated simultaneously.
Inventors
- 👤 Joseph A Turgeon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:30
CPC Classifications
H; H01; H01H; H01H31/00; H01H31/26; H01H31/32; H01H3/00; H01H3/32; H01H3/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
166 words
Electrical switching apparatus comprising: first and second hollow conductors in axial alignment having a gap therebetween; first movable conductor means located within said first hollow conductor and movable between a first position in which said movable conductor means is electrically isolated from said second hollow conductor and a second position in which said movable conductor means is electrically connected to said second hollow conductor; first gear reduction means located substantially within said first conductor and linked to said movable conductor means for moving said movable conductor means between its first and second positions; wherein said second hollow conductor includes contact jaw means which frictionally receives said first movable conductor means when said first movable conductor means moves to its second position; and wherein said first gear reduction means is linked to said first movable conductor means in a dead center crank operating relationship which generates higher force on said first movable conductor means as it reaches its second position and frictionally engages said contact jaw means.
Claim 2
Dependent Claim
166 words
Electrical switching apparatus comprising: first and second hollow conductors in axial alignment having a gap therebetween; first movable conductor means located within said first hollow conductor and movable between a first position in which said movable conductor means is electrically isolated from said second hollow conductor and a second position in which said movable conductor means is electrically connected to said second hollow conductor; first gear reduction means located substantially within said first conductor and linked to said movable conductor means for moving said movable conductor means between its first and second positions; wherein said second hollow conductor includes contact jaw means which frictionally receives said first movable conductor means when said first movable conductor means moves to its second position; and wherein said first gear reduction means is linked to said first movable conductor means in a dead center crank operating relationship which generates higher force on said first movable conductor means as it reaches its second position and frictionally engages said contact jaw means.
Claim 3
Dependent Claim
108 words
The electrical apparatus of claim 1, wherein said first gear reduction means includes a rotatable output crank and a driving link secured at one end to a peripheral point on said crank and at its other end to said first movable conductor means, said peripheral point being selected relative to the pivotal axis of said output crank such that when said first movable conductor means approaches its second position in frictional engagement with sAid contact jaw means, said peripheral point will approach an imaginary straight line joining said pivotal axis and the point of connection between said other end of said link and said first movable conductor means.
Claim 4
Dependent Claim
53 words
The electrical apparatus of claim 1, wherein said first movable conductor means has enlarged cross-sectional areas at opposite ends thereof relative to a reduced cross-sectional area intermediate said opposite ends, and said contact jaw means frictionally engages one of said enlarged ends when said first movable conductor means is in its second position.
Claim 5
Dependent Claim
85 words
The electrical apparatus of claim 3, and further including bearing means supporting said first movable conductor means within said first hollow conductor, said bearing means having an outside diameter corresponding to the inside diameter of said first hollow conductor, and an inside diameter slightly larger than said reduced cross-sectional area of said first movable conductor means, whereby said first movable conductor means will require less force to move between said first and second positions to finally engage said contact jaw means at its second position.
Claim 6
Dependent Claim
41 words
The electrical apparatus of claim 4, wherein said bearing means includes spring biased contact means for firmly engaging the other of said enlarged ends of said first movable contact means when said first movable contact means is in its second position.
Claim 7
Dependent Claim
50 words
The electrical apparatus of claim 4, wherein said first gear reduction means is linked to said first movable conductor means in a dead center crank operating relationship which generates higher force on said first movable conductor means as it reaches its second position and frictionally engages said contact jaw means.
Claim 8
Dependent Claim
108 words
The electrical apparatus of claim 6, wherein said first gear reduction means includes a rotatable output crank and a driving link secured at one end to a peripheral point on said crank and at its other end to said first movable conductor means, said peripheral point being selected relative to the pivotal axis of said output crank such that when said first movable conductor means approaches its second position in frictional engagement with said contact jaw means, said peripheral point will approach an imaginary straight line joining said pivotal axis and the point of connection between said other end of said link and said first movable conductor means.
Claim 9
Dependent Claim
186 words
The electrical apparatus of claim 1, and further including: third and fourth hollow conductors in axial alignment having a gap therebetween; second movable conductor means located within said third hollow conductor and movable between a first position in which said second movable conductor means is electrically isolated from said fourth hollow conductor and a second position in which said movable conductor means is electrically connected to said fourth conductor; second gear reduction means located substantially within said third conductor and linked to said second movable conductor means for moving said movable conductor means between its first and second positions; wherein said fourth hollow conductor includes second contact jaw means which frictionally receives said second movable conductor means when said second movable conductor means moves to its second position; wherein said second gear reduction means is linked to said second movable conductor means in a dead center crank operating relationship which generates higher force on said second movable conductor means as it reaches its second position and frictionally engages said second contact jaw means; and common drive means for operating said first and second gear reduction means.
Claim 10
Dependent Claim
33 words
The electrical apparatus of claim 8, wherein said common drive means includes a shaft arrangement including at least one insulator between said first and second gear reduction means to provide electrical insulation therebetween.
Claim 11
Dependent Claim
26 words
The electrical apparatus of claim 9, wherein said first and second and third and fourth conductors are insulaTingly supported within first and second metallic housings, respectively.
Claim 12
Dependent Claim
21 words
The electrical apparatus of claim 9, wherein said common drive means is electrically isolated from said first and second metallic housings.
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |