Patent US4273979A successfully refreshed from Google Patents.
US4273979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-voltage circuit breaker with means for limiting contact lifting
Assignee: Siemens AG
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Filing: 1979-04-11
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Granted: 1981-06-16
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Expires: 1999-04-11
Abstract
Abstract A low-voltage circuit breaker has a fixed contact and a movable contact which is attached to a pivoted contact carrier. Between the contact carrier and the movable contact, a contact pressure spring is arranged, which is designed as a coil compression spring. The contact carrier has an arm which extends to the vicinity of the contact-making end of the movable contact. The arm carries a setscrew which is positioned to act centrally with respect to a contact overlay of the movable contact. The setscrew limits the lifting of the movable contact or the contact overlay to the desired small extent, when a large current flows through the circuit breaker and exerts electrodynamic force on the movable contact.
Inventors
- 👤 Klaus-Gunther Berndt
- 👤 Manfred Kruger
- 👤 Wolfgang Nawrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:22
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/50; H01H71/504
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A low voltage circuit breaker comprising: a fixed contact; a movable, pivoted contact carrier; a movable contact, pivoted around a joint on the contact carrier and having a contact overlay; a pressure spring between the movable contact carrier and the movable contact and tending to move the movable contact around the joint; an arm extending from the contact carrier approximately to the contact-making end of the movable contact; and an adjustable stop for limiting lifting of the movable contact from the "on" position, the adjustable stop positioned on the arm to act centrally of the contact overlay; the contact spring located next to the stop between the stop and the joint.
Claim 2
Dependent Claim
111 words
A low voltage circuit breaker comprising: a fixed contact; a movable, pivoted contact carrier; a movable contact, pivoted around a joint on the contact carrier and having a contact overlay; a pressure spring between the movable contact carrier and the movable contact and tending to move the movable contact around the joint; an arm extending from the contact carrier approximately to the contact-making end of the movable contact; and an adjustable stop for limiting lifting of the movable contact from the "on" position, the adjustable stop positioned on the arm to act centrally of the contact overlay; the contact spring located next to the stop between the stop and the joint.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |