GB562177A - Improvements in or relating to toggles, particularly applicable to electric switches - Google Patents

Abstract

562,177. Toggles. LANDIS & GYR SOC. ANON. Oct. 27, 1942, No. 15053. Convention date, Nov. 8, 1941. [Class 80 (iii)] [Also in Group XXXVII] Consists in a toggle in which the bending element is a helical spring. The spring 1, Fig. 2, has eyes 2 at its ends for connection to the points of application of the forces P to be released and when straight, the coils of the spring touch one another thus enabling a heavy pressure to be withstood. In place of the eyes 2, bearing pieces 3, Fig. 3, screwed into the coils of the spring may be provided, the pivot holes 4 in these pieces being either in line with the axis of the spring or off-set therefrom preferably in the direction from which the releasing force F acts. This force may act upon an extension 7, Fig. 5, of the upper bearing piece. Spherical bearing pieces 8, Fig. 6, permit a plurality of forces F, F<1> &c. to act on the spring and this is particularly advantageous in circuit breakers for house wiring where, in addition to a thermal overload release, there is a short-circuit or hand release. In a further modification, the bearing pieces have conical recesses to receive conical centres on the ends of the spring. As applied to a switch, Fig. 9, each bearing piece 3 of the toggle spring 1 has a lateral extension 7. A plate 12 having sliding connection with the upper piece 3 carries a push-button 13. The release force F can be applied by an auxiliary spring-loaded press button on a stem 15 adapted to act on the upper extension 7. The movable contact 17 is mounted on spring 16, the fixed contact being at 18. An armature 19 of an electromagnet 20 is in operative relationship with the lower extension 7. A lever 23 maintained by a weight 25 against a stop 26 carries a latch 22 adapted to enter at slot 21 in the plate 12. When the switch is closed, the button 13 is pressed in and held by latch 22. If the auxiliary button be now pressed, the toggle is broken, the contacts 17, 18 opened suddenly and the latch released. The toggle may be broken by the armature 19.