Manual electric switch with thermal release
AssigneeLa Telemecanique Electrique
InventorsRaymond A. Ingrain, Jacques Cohen
Life of this patent
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Abstract
In a manual switch with thermal and magnetic release, the fixed pivots of a control member, of a latch, and of a transmission member coupled to the contacts, are disposed at the apices of a right-angled triangle, one side bounding the right angle being parallel to the direction of actuation of the control member and to the movement of the contacts, the other side bounding the right angle being placed in the vicinity of the control member.
Claims6
In a switch, with manual closing and opening and with thermal release, having a housing, an operating member in the housing and coupled to a control arm which is movable about a first fixed pivot and an end of which is coupled by a first articulation to a first end of a connecting rod to constitute a knee joint, a second end of said connecting rod being coupled by a second articulation to a loading lever, a first end of which loading lever is abutted on a latch displaced rotatably about a second fixed pivot, by the movement of overload bi-metallic strips, and a second end of which loading lever cooperates with a transmission lever which is associated with movable contacts, and which pivots about a third pivot, the improvement that:
- (i) the first pivot and the second pivot are disposed in the proximity of an upper part of said housing near to said operating member,
- (ii) said third pivot is fixed and disposed at the lower part,
- (iii) said three pivots are placed substantially at the apices of a right-angled triangle, and
- (iv) said second and third pivots are placed on a straight line substantially parallel to the direction of movement of said operating member and to the direction of movement of said movable contacts.
Dependencies are inferred from the claim text.