US4521655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric power switch with slotted commutation end plate
Assignee: Mitsubishi Electric Corp
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Filing: 1983-02-02
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Granted: 1985-06-04
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Expires: 2003-02-02
Abstract
Abstract In an electric power switch in which an arc generated between movable and stationary contacts 6, 14 migrates to an arc runner 15 and a commutation end plate and is extinguished by a grid 2 arranged therebetween, a cut is formed at least in the lower half of the end plate which confronts the grid, whereby the end of the arc is driven towards the center of the end plate and away from a surrounding arc box 1.
Inventors
- 👤 Hiroyuki Okado
- 👤 Shigeru Masuda
- 👤 Teijiro Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:16
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/30; H01H9/46; H01H9/44; H01H9/48
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
An electric power switch, comprising: (a) a stationary contact (14), (b) a movable contact (6) confronting said stationary contact and adapted to be moved into and out of engagement therewith, (c) an arc runner (15) provided proximate said movable contact and electrically connected to said stationary contact, for providing a path of migration for the end of an arc formed when said movable and stationary contact engagement is broken, and (d) a commutation plate (3) disposed near the path of movement of said movable contact, for providing a path of migration for the other end of said arc from said movable contact, (e) said commutation plate having an end plate for guiding said other end of the arc, and a cut at a central portion of said end plate, whereby said other end of the arc is driven towards the center of said end plate.
Claim 2
Dependent Claim
145 words
An electric power switch, comprising: (a) a stationary contact (14), (b) a movable contact (6) confronting said stationary contact and adapted to be moved into and out of engagement therewith, (c) an arc runner (15) provided proximate said movable contact and electrically connected to said stationary contact, for providing a path of migration for the end of an arc formed when said movable and stationary contact engagement is broken, and (d) a commutation plate (3) disposed near the path of movement of said movable contact, for providing a path of migration for the other end of said arc from said movable contact, (e) said commutation plate having an end plate for guiding said other end of the arc, and a cut at a central portion of said end plate, whereby said other end of the arc is driven towards the center of said end plate.
Claim 3
Dependent Claim
39 words
An electric power switch as claimed in claim 1, wherein said commutation plate has a pair of legs positioned on both sides of the path of movement of said movable contact, and the end plate merges with said legs.
Claim 4
Dependent Claim
27 words
An electric power switch as claimed in claim 2, wherein said cut is formed in a portion of said end plate which is closest to said legs.
Claim 5
Dependent Claim
19 words
An electric power switch as claimed in claim 2, wherein said cut is in the form of a slit.
Claim 6
Dependent Claim
24 words
An electric power switch as claimed in claim 4, wherein said slit is a through slit and divides the end plate into two halves.
Claim 7
Dependent Claim
19 words
An electric power switch as claimed in claim 4, wherein said slit extends only partially across said end plate.
Claim 8
Dependent Claim
16 words
An electric power switch as claimed in claim 2, wherein said cut is U-shaped or V-shaped.
Claim 9
Dependent Claim
32 words
An electric power switch as claimed in claim 1, wherein an arc extinguishing grid (2) is provided between said arc runner and said end plate, and said end plate confronts said grid.
Claim 10
Dependent Claim
100 words
An electric power switch as claimed in claim 8, wherein the commutation plate includes a strap portion disposed parallel to an arm (5) mounting the movable contact, a first pair of spaced legs depending downwardly from an end of the strap portion and flanking the movable contact, a second pair of spaced legs extending parallel to the strap portion from lower ends of the first pair of legs, and said end plate extending upwardly from distal ends of the second pair of legs, the first and second pairs of legs and the end plate thus having an upwardly open U-shape.
Claim 11
Dependent Claim
30 words
An electric power switch as claimed in claim 9, wherein said cut is formed in a portion of said end plate which is closest to said second pair of legs.
Claim 12
Dependent Claim
19 words
An electric power switch as claimed in claim 10, wherein said cut is in the form of a slit.
Claim 13
Dependent Claim
19 words
An electric power switch as claimed in claim 11, wherein said slit extends only partially across said end plate.
Claim 14
Dependent Claim
16 words
An electric power switch as claimed in claim 10, wherein said cut is U-shaped or V-shaped.
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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |