US3860898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breaker for distribution transformer
Assignee: ABB Inc USA
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Filing: 1973-09-11
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Granted: 1975-01-14
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Expires: 1993-09-11
Abstract
Abstract A circuit breaker for a distribution transformer characterized by a housing including a molded portion of insulating material and another portion of metal, a stationary contact on said molded housing portion, a bimetal element having one end mounted in said other housing portion and having a flanged portion at the other end, a trip arm spaced from the bimetal element and composed of a magnetically permeable material attractable to the bimetal element at a designated current load, the trip arm being pivotally mounted on said other housing portion and having a flange. The circuit breaker also comprises a movable switch arm having at one end a contact for cooperation with the stationary contact and the other end being detachably engageable with the flange, guide means on the molded housing portion, a toggle link operatively connected to the switch arm and movable along said guide means, a latch pivotally mounted in the channel to effect release of the trip arm when the bimetal element is actuated, and manual means connected to said toggle link for moving the contacts to the open position.
Inventors
- 👤 Merrill G Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:41
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/04; H01H71/10; H01H71/12; H01H71/40; H01H71/50; H01H71/74; H01H71/7427
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
170 words
A circuit breaker comprising a first housing of molded insulating material, a second housing of metal on said first housing, a stationary contact on said first housing, a bimetal element having one end mounted in the second housing and having a flanged portion at the other end, a trip arm spaced from the bimetal element and composed of magnetically permeable material to effect movement toward the bimetal element, said trip arm being pivotally mounted on said second housing and having a support flange, a movable switch arm having a first contact for cooperation with said stationary contact, a second contact on said switch arm for cooperation with the flange, guide means on said first housing, a toggle link operatively connected to the switch arm and movable along said guide means, a latch pivotally mounted on the second housing to effect release of the trip arm when the bimetal element is actuated, and manual means connected to said toggle link for moving the first and second contacts to the open position.
Claim 2
Dependent Claim
170 words
A circuit breaker comprising a first housing of molded insulating material, a second housing of metal on said first housing, a stationary contact on said first housing, a bimetal element having one end mounted in the second housing and having a flanged portion at the other end, a trip arm spaced from the bimetal element and composed of magnetically permeable material to effect movement toward the bimetal element, said trip arm being pivotally mounted on said second housing and having a support flange, a movable switch arm having a first contact for cooperation with said stationary contact, a second contact on said switch arm for cooperation with the flange, guide means on said first housing, a toggle link operatively connected to the switch arm and movable along said guide means, a latch pivotally mounted on the second housing to effect release of the trip arm when the bimetal element is actuated, and manual means connected to said toggle link for moving the first and second contacts to the open position.
Claim 3
Dependent Claim
15 words
The circuit breaker of claim 1 in which the second housing has a channel configuration.
Claim 4
Dependent Claim
29 words
The circuit breaker of claim 1 in which second guide means is provided on the housing and the manual means comprises a member movable along the second guide means.
Claim 5
Dependent Claim
22 words
The circuit breaker of claim 3 in which the manual means comprises toggle spring means between said member and the toggle link.
Claim 6
Dependent Claim
42 words
The circuit breaker of claim 1 in which the manual means comprises a rod movable longitudinally to effect opening and closing of the contacts and a rotatable nut engaging a threaded portion of the rod to effect longitudinal movement of the rod.
Claim 7
Dependent Claim
40 words
The circuit breaker of claim 1 in which a control arm is pivotally mounted on the second housing and movable into the path of travel of the trip arm to effect locking of the trip arm in the non-trip position.
Claim 8
Dependent Claim
52 words
The circuit breaker of claim 1 in which a calibration arm is operatively mounted on said one end of the bimetal element and a calibration screw mounted in the second housing and operatively connected to the opposite end of the calibration arm to effect adjustment of the movement of the bimetallic element.
Claim 9
Dependent Claim
35 words
The circuit breaker of claim 1 in which a mild steel member is releasably slidably mounted on the trip arm to effect magnetic adjustment for the amount of current required to trip the circuit breaker.
Claim 10
Dependent Claim
167 words
A circuit breaker comprising a housing, a stationary contact on the housing, a movable switch arm having a contact thereon for cooperation with said stationary contact, a switch arm projection on said swtich arm, first guide means on said housing, a toggle link operatively connected to the switch arm and movable along said guide means, second guide means on the housing, manual means connected to the toggle means and movable along said second guide means to effect opening and closing of the contact with the stationary contact, a bimetal element having one end mounted in the housing and having a flanged portion at the other end, a trip arm spaced from the bimetal element and composed of a magnetically permeable material to effect movement toward the bimetal element, said trip arm being pivotally mounted on the housing and having a projection engageable with the switch arm and a latch pivotally mounted on the housing to effect release of the trip arm when the bimetal element is actuated.
Claim 11
Dependent Claim
167 words
A circuit breaker comprising a housing, a stationary contact on the housing, a movable switch arm having a contact thereon for cooperation with said stationary contact, a switch arm projection on said swtich arm, first guide means on said housing, a toggle link operatively connected to the switch arm and movable along said guide means, second guide means on the housing, manual means connected to the toggle means and movable along said second guide means to effect opening and closing of the contact with the stationary contact, a bimetal element having one end mounted in the housing and having a flanged portion at the other end, a trip arm spaced from the bimetal element and composed of a magnetically permeable material to effect movement toward the bimetal element, said trip arm being pivotally mounted on the housing and having a projection engageable with the switch arm and a latch pivotally mounted on the housing to effect release of the trip arm when the bimetal element is actuated.
Claim 12
Dependent Claim
40 words
The circuit breaker of claim 9 in which the manual means comprises a pin in slidable contact with the second guide means and toggle spring means between the pin and the toggle link to effect movement of the triP arm.
Claim 13
Dependent Claim
40 words
The circuit breaker of claim 9 in which a control arm is pivotally mounted on the housing and is movable into the path of travel of the trip arm to effect locking of the trip arm in the non-trip position.
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |