US3774129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
No-fuse circuit breaker
Assignee: Toshiba Corp
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Filing: 1972-11-09
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Granted: 1973-11-20
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Expires: 1992-11-09
Abstract
Abstract A no-fuse circuit breaker comprising at least one movable contact arm, one end portion of which is rotatably supported on a mechanism frame and the other end of which is provided with a contact point engagable with a stationary contact in the mechanism. An intermediate portion of the movable contact arm is operatively connected to one end of a pair of links operatively connected in series, the other end of the links being operatively connected to an operating handle rotatably mounted on the mechanism frame. A latching member is rotatably mounted on the mechanism frame, being engageable with one end of a releasable member, the other end of the releasable member being operatively connected to a knee connection between the pair of links, whereby the movement of the knee connection is restricted by the releasable member when latched by the latching member. Thus, the movable contact arm is actuated by the operating handle when the releasable member is latched by the latching member, and the movable contact arm can be tripped when the restriction in the movement of the knee connection of the links is released due to disengagement of the releasable member with the latching member as may be caused by the rotation thereof.
Inventors
- 👤 S Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:35
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/50; H01H71/52; H01H71/528
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
344 words
A no-fuse circuit breaker comprising: an insulative casing; a mechanism frame mounted in said casing at one side thereof and having a pair of side plates arranged in parallel relation, each of said side plates having an elongated slot therein; a stationary contact member mounted on the other side of said casing at the bottom thereof; a movable contact arm supported at one end thereof by and between said side plates, having a contact portion at the other end thereof engageable with said stationary contact member and being spring biased to normally separate said contact portion thereof from said stationary contact member; an operating handle rotatably supported by and between said side plates and having one portion extending outwardly from said casing; an upper link rotatably connected at one end portion thereof to said operating handle at another portion; a lower link operatively connected at one end portion thereof to the other end portion of said upper link, the other end portion of said lower link being rotatably connected to an intermediate portion of said movable contact arm; a releasable member operatively connected at one end portion thereof to the connection between said upper and lower links, and being slidably guided at its other end portion by said slots in said side plates; a latching member rotatably mounted on and between said side plates, being capable of latching said other end portion of said releasable member, and being spring biased to be resiliently kept in position engageable with said other end portion of said releasable member; and means for actuating said latching member to disengage from said releasable member in response to a flow of current larger than a predetermined value; whereby said movable contact arm may be actuated to open and close said movable contact portion thereof and said stationary contact by said operating handle when said releasable member is latched by said latching member, and said movable contact arm can be tripped when the engagement of said releasable member with said latching member is released by the operation of said actuating means.
Claim 2
Dependent Claim
344 words
A no-fuse circuit breaker comprising: an insulative casing; a mechanism frame mounted in said casing at one side thereof and having a pair of side plates arranged in parallel relation, each of said side plates having an elongated slot therein; a stationary contact member mounted on the other side of said casing at the bottom thereof; a movable contact arm supported at one end thereof by and between said side plates, having a contact portion at the other end thereof engageable with said stationary contact member and being spring biased to normally separate said contact portion thereof from said stationary contact member; an operating handle rotatably supported by and between said side plates and having one portion extending outwardly from said casing; an upper link rotatably connected at one end portion thereof to said operating handle at another portion; a lower link operatively connected at one end portion thereof to the other end portion of said upper link, the other end portion of said lower link being rotatably connected to an intermediate portion of said movable contact arm; a releasable member operatively connected at one end portion thereof to the connection between said upper and lower links, and being slidably guided at its other end portion by said slots in said side plates; a latching member rotatably mounted on and between said side plates, being capable of latching said other end portion of said releasable member, and being spring biased to be resiliently kept in position engageable with said other end portion of said releasable member; and means for actuating said latching member to disengage from said releasable member in response to a flow of current larger than a predetermined value; whereby said movable contact arm may be actuated to open and close said movable contact portion thereof and said stationary contact by said operating handle when said releasable member is latched by said latching member, and said movable contact arm can be tripped when the engagement of said releasable member with said latching member is released by the operation of said actuating means.
Claim 3
Dependent Claim
51 words
A no-fuse circuit breaker as claimed in claim 1, where said releasable member is a substantially U-shaped rod, one leg portion thereof being adapted to function as a connecting pin for said upper and lower links and the other leg portion thereof being inserted through said slots in said side plates.
Claim 4
Dependent Claim
22 words
A no-fuse circuit breaker as claimed in claim 1, wherein said means for actuating said latching member is an electromagnetic trip arrangement.
References Cited (Backward Citations)
US3329912A
Cited
US3395372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |