US3560688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact means for electric circuit breakers
Assignee: ABB Norden Holding AB
•
Filing: 1969-05-12
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Granted: 1971-02-02
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Expires: 1989-05-12
Abstract
Abstract A contact arrangement for circuit breakers includes a movable contact plug and a stationary sheath contact. In the sheath contact, a plurality of contact fingers are arranged in ring formation and are pressed against the contact plug by means of leaf springs punched out of sheet material. Each leaf spring is loosely inserted in a longitudinal groove in the associated contact finger in such a way that the spring action occurs in the plane of the spring.
Inventors
- 👤 Sven Bachler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:16
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/12; H01H1/36; H01H1/38; H01H1/385
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
A contact means for electric circuit breakers comprising a contact housing, a contact plug and a sheath contact, said sheath contact surrounding said contact plug and comprising a plurality of contact fingers, said contact fingers extending in the direction of said contact plug and arranged in ring formation between said contact plug and the contact housing, leaf springs pressing said contact fingers radially against said contact plug, said springs punched out of sheet material and arranged between said contact housing and said contact fingers, said contact fingers having longitudinal grooves therein, said grooves having the same cross section along the entire length of the contact fingers, said springs loosely inserted in said grooves.
Claim 2
Dependent Claim
113 words
A contact means for electric circuit breakers comprising a contact housing, a contact plug and a sheath contact, said sheath contact surrounding said contact plug and comprising a plurality of contact fingers, said contact fingers extending in the direction of said contact plug and arranged in ring formation between said contact plug and the contact housing, leaf springs pressing said contact fingers radially against said contact plug, said springs punched out of sheet material and arranged between said contact housing and said contact fingers, said contact fingers having longitudinal grooves therein, said grooves having the same cross section along the entire length of the contact fingers, said springs loosely inserted in said grooves.
Claim 3
Dependent Claim
20 words
A contact means according to claim 1, in which each spring exerts a force in the plane of the spring.
Claim 4
Dependent Claim
52 words
A contact means according to claim 1, in which each spring is substantially housed in the associated contact finger. 4 A contact means according to claim 1, in which said contact housing is provided at one end with an arcing ring, which is arranged to engage one end of the contact fingers.
Claim 5
Dependent Claim
37 words
A contact means according to claim 1, in which a peg-shaped stationary contact part is arranged centrally at the bottom of the contact housing, the base end of said contact fingers pressed against said stationary contact part.
Claim 6
Dependent Claim
41 words
A contact means according to claim 5, in which one and the same spring effects contact pressure both against said contact plug and against said stationary contact part, the pressure point of the spring being situated nearer said stationary contact part.
Claim 7
Dependent Claim
28 words
A contact means according to claim 1, in which the surface of said contact fingers facing said contact plug has a concave surface to fit the contact plug.
Claim 8
Dependent Claim
25 words
A contact means according to claim 7, in which the surface of said contact fingers facing said contact plug has several different radii of curvature.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |