US4331375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contact assembly
Assignee: Toshiba Corp
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Filing: 1979-11-21
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Granted: 1982-05-25
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Expires: 1999-11-21
Abstract
Abstract An electrical contact assembly used for a circuit breaker comprises a pair of relatively movable U-shaped contact and bar conductor, and a holder provided with a recess for receiving the U-shaped contact. The U-shaped contact has contacting portions formed by slightly bending both sides thereof inwardly to form a narrow opening for clamping the bar conductor. The electrical contact assembly further comprises conductive members which are disposed on both sides of the U-shaped contact and electrically connected thereto, so that currents passing through the conductive members symmetrically flow in a direction opposite to a flow direction of currents passing through the both sides of the U-shaped contact when the U-shaped contact and the bar conductor are engaged.
Inventors
- 👤 Seietsu Takamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:06
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/50; H01H1/54; H02; H02B; H02B1/00; H02B1/26; H02B1/30; H02B1/32; H02B1/34; H02B1/36; H02B11/00; H02B11/02; H02B11/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
In an electrical contact assembly used for a circuit breaker of the type comprising a U-shaped contact, a bar conductor to be connected to said U-shaped contact, and a holder provided with a recess for receiving said U-shaped contact, wherein said U-shaped contact includes end portions near its opening which are narrowed to form contacting portions between which said bar conductor is to be clamped when said U-shaped contact and said bar are engaged, the improvement which comprises conductive members disposed on both sides of said U-shaped contact and electrically connected thereto so that when said U-shaped contact and said bar conductor are engaged, currents passing through said conductive members substantially symmetrically flow in a direction opposite to a flow direction of currents passing through the sides of said U-shaped contact, said conductive members being firmly in contact with the walls of said recess provided in said holder.
Claim 2
Dependent Claim
148 words
In an electrical contact assembly used for a circuit breaker of the type comprising a U-shaped contact, a bar conductor to be connected to said U-shaped contact, and a holder provided with a recess for receiving said U-shaped contact, wherein said U-shaped contact includes end portions near its opening which are narrowed to form contacting portions between which said bar conductor is to be clamped when said U-shaped contact and said bar are engaged, the improvement which comprises conductive members disposed on both sides of said U-shaped contact and electrically connected thereto so that when said U-shaped contact and said bar conductor are engaged, currents passing through said conductive members substantially symmetrically flow in a direction opposite to a flow direction of currents passing through the sides of said U-shaped contact, said conductive members being firmly in contact with the walls of said recess provided in said holder.
Claim 3
Dependent Claim
32 words
The electrical contact assembly according to claim 1 wherein said conductive members comprise a U-shaped conductive member provided with a bottom which is electrically connected to the bottom of said U-shaped contact.
Claim 4
Dependent Claim
29 words
The electrical contact assembly according to claim 1 wherein said conductive members are L-shaped conductive plates each having one end connected to a corresponding side of said U-shaped contact.
Claim 5
Dependent Claim
49 words
The electrical contact assembly according to claim 1 wherein said holder includes a cover provided with an opening through which said contacting portions of said U-shaped contact project and with shoulders against which respective one ends of said conductive members abut when said cover is applied to said holder.
Claim 6
Dependent Claim
70 words
The electrical contact assembly according to claim 4 wherein a first semi-cylindrical member provided with a first semi-cylindrical recess is mounted on one surface of said cover, and said holder has a second semi-cylindrical member so as to form a cylindrical member having a through hole formed by said recesses when said cover is applied to said holder to pass a cable through said through hole of said cylindrical member.
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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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |