Patent EA-000329-B1 (EA)
Title: Device for connecting an external conductor such as a cable to a contact of an electrical apparatus
Inventor: VANZETTO DANIEL
IPC: H01H71/08
Filed: 1996-12-10
Abstract: 1. A device for connecting an external conductor such as a cable to a flat contact of an electrical apparatus such as a circuit breaker in a moulded housing comprising a metal block releasable fitted in a terminal compartment at the back of the housing and provided with an elongated through hole for receiving a circuit breaker terminal strip and a clamping screw extending through the upper portion of the block for clamping the cable against the contact, characterized in that the clamping screw (23) comprises at its extreme end situated inside of the metal block (14) a clamping shoe (24), wherein said shoe comprises projections (25-28) or recesses engaging matching recesses (29-32) (or projections) on said terminal strip (6-9) so that the cable is positively retained between the shoe (24) and the contact (6-9) when the screw (23) is tightened. 2. Device according to Claim 1, characterized in that said clamping shoe (24) has a rectangular shape and comprises in each of its angles said projection (25-28) opposite said recess (29-32) of the corresponding shape on said terminal strip (6-9). 3. Device according to Claim 1 or 2, characterized in that comprises a pair of elongated grooves (18, 19), formed correspondingly on two internal surfaces (2a, 2b) of said terminal compartment (2-5) and provided for to receive in it a nut with a holder (20) or similar element. 4. Device according to Claim 3, characterized in that said elongated grooves (18, 19) are located in the lower portion of said terminal compartment (2-5). 5. Device according to Claim 3 or 4, characterized in that three opposite each other orifices (20b, 43, 44) are provided for, correspondingly, in said nut with said holder (20), in flat terminal strip (6-9) and in said lower portion of said terminal compartment (2-5), wherein orifices are provided to pass a fixation screw (50) of a tip (42) or a current-bearing busbar on the flat contact of said terminal strip (6-9). 6. Device according to any of the preceding Claim, characterized in that a plate (41), closing said terminal compartments, is fixed on the rear side of the circuit breaker, wherein said plate (41) comprises an orifice (20) against each clamping terminal or a cleat to pass an electrical conductor, wherein said clamping screw (23) is connected with he protection screen (33), enabling to partial closure of a corresponding orifice (40) of said plate (41) when the screw (23) is tightened. 7. Device according to Claim 6, characterized in that said protection screen (33) constitutes a piece of L-shaped form, one of shelves of which (33a) is mounted freely rotating around the lower portion of said clamping screw (23) between said clamping shoe (24) and the upper portion (34) of said metal block (14), while the other shelf of which (33b) passes in the direction of this upper portion of said metal block (14). 8. Device according to any of the preceding Claim, characterized in that said clamping shoe (24) is fixed on one of the ends of said clamping screw (23) by expansion 9. Device according to any of the preceding Claim, characterized in that an additional flat contact (46) is connected to each of terminal compartment (2, 3, 4, 5) for electrical connection with outer device, e.g. control bulb. 10. Device according to any of the preceding Claim, characterized in that said plate (41), closing said terminal compartments, is fixed on the rear side of the circuit breaker by special projections (41a), provided for on the internal surface of the plate (41) and interacting with recesses of the corresponding shape (41b), made in the rear portion of said housing of the electrical apparatus. 11. Device according to Claim 10, characterized in that said recesses (41b) of said plate (41) and fixed (29-32) on said housing have transverse section of T-shaped form and perpendicular to the longitudinal direction of the electrical apparatus and arranged in areas, separating adjacent terminal compartments. 12. Apparatus for disconnecting electrical circuits such as a circuit breaker, comprising on, at least, one of its big side faces terminal compartments (2-5), inside which flat contacts (6-9) are arranged, characterized in that comprises, at least, one device for connection of an outer electrical conductor according to any preceding Claim. 13. Apparatus for disconnecting electrical circuits such as a circuit breaker according to Claim 12, characterized in that comprising a plurality of devices for connection of an outer electrical conductor according to any of 1-11 Claims, wherein at least one of clamping screw with a contact plate (23) is replaced for one with convex end (22), interacting with the flat contact (6), having recesses