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US 4,929,919 AGranted
Twin unit circuit breaker with improved magnet structure
AssigneeEaton Corporation
InventorsDonald A. Link, Dean A. Hubbard, Michael R. Larsen
Life of this patent
Estimating the term…
Abstract
A twin unit circuit breaker has a V-shaped stainless steel combination armature pivot and bias spring, a central offset portion on the armature to increase the armature surface area that is substantially uniformly spaced to pole faces of a pole piece, a thin profile connection of an operating spring with a latch lever, and a preformed U-shaped conductor attachable in circuit between a bimetal and a flexible conductor and insertable over a pole piece from one end thereof.
Claims25
A current responsive circuit breaker comprising:
- an insulating housing;
- a stationary contact mounted in said housing;
- a movable contact in said housing engagable with said stationary contact;
- magnetic current sensing means in said housing comprising a pole piece having a pair of pole faces thereon and an armature pivotally mounted in spaced proximity to said pole faces, said armature being movable into engagement with said pole faces;
- means operable to effect separation of said movable contact from said stationary contact in response to movement of said armature toward engagement with said pole faces;
- and
- metallic bearing means mounted in said housing, said bearing means having a smooth surface trough and said armature having a blade edge pivot received in said trough.
4 more elements
A current responsive circuit breaker comprising:
- an insulating housing;
- a stationary contact mounted in said housing;
- a movable contact in said housing engagable with said stationary contact;
- magnetic current sensing means in said housing comprising:
- an elongated pole piece having a U-shaped cross section mounted in said housing, free ends of legs of said pole piece providing elongated pole faces;
- electrically conductive means extending through said pole piece between said legs thereof, current in said conductive means inducing a magnetic field in said pole piece;
- an armature mounted in spaced proximity to said pole faces and being movable to engage said faces, said armature having an offset central portion protruding toward said pole piece and disposed between said legs of said pole piece when said armature engages said pole faces, said offset portion providing an increased area on said armature which is substantially uniformly spaced from said pole faces, thereby to increase a flux pattern on said armature at magnetic gaps between said armature and said pole faces;
- and
- means operable to effect separation of said movable contact from said stationary contact in response to movement of said armature toward said pole faces.
6 more elements
A current responsive circuit breaker comprising:
- an insulating housing;
- a stationary contact mounted in said housing;
- a movable contact in said housing engagable with said stationary contact;
- electrically conductive means mounted in said housing;
- an elongated pole piece having a U-shaped cross section carried by said conductive means, a bight portion of said pole piece being affixed to said conductive means and legs of said pole piece being disposed on opposite sides of said conductive means, free ends of said legs providing pole faces;
- an armature mounted in spaced proximity to said pole faces and movable into engagement therewith;
- means operable to effect separation of said movable contact from said stationary contact in response to movement of said armature toward said pole faces;
- a substantially U-shaped preformed conductor disposed around said pole piece, a first leg of said preformed conductor being attached at a free end thereof to said conductive means at one end of said pole piece, said first leg extending along said bight portion of said pole piece in spaced relation thereto beyond an opposite end of said pole piece, a bight portion of said preformed conductor extending around said conductive means in spaced relation thereto, a second leg of said preformed conductor extending from said bight portion thereof between said legs of said pole piece, a free end of said second leg extending beyond said one end of said pole piece;
- and
- a flexible conductor attached to said free end of said second leg and to said movable contact.
7 more elements
In a current responsive circuit breaker having:
- an insulating housing having an opening;
- an operator rotatably mounted in said housing having a handle projecting through said opening;
- a stationary contact mounted in said housing;
- a movable contact arm having a pivotal connection at one end to said operator and a contact at an opposite end movable into and out of engagement with said stationary contact as said arm moves about said pivotal connection;
- an armature pivotally mounted in said housing, said armature having a latch surface thereon;
- a latch lever pivotally mounted in said housing and engaging said latch surface in a first position of said latch lever;
- a spring connected between said latch lever and said opposite end of said arm biasing said contact thereof into engagement with said stationary contact;
- conducting means electrically connecting said arm to terminal means carried by said housing;
- and
- means responsive to predetermined current in said conducting means moving said armature to release said latch lever, said spring moving said latch lever to a second position whereat said spring moves said arm to separate said contact thereof from said stationary contact;
- the improvement comprising:
- metallic bearing means mounted in said housing having a smooth surface trough;
- and
- a substantially blade edge pivot on said armature received in said trough.
11 more elements
Dependencies are inferred from the claim text.