GB191106147A - Improvements in Push-button Electric Switches. - Google Patents

Abstract

6147. Hartmann & Braun Akt.-Ges. April 12, 1910, [Convention date]. Switches, quick - action; contacts.-A pushbutton switch is arranged to close and open a circuit upon successive depressions by means of a moving contact which travels over a closed path round a fixed contact. A contact K<1> carried on the free end of a spring F is caused to move over a path 1, 2, Fig. 3, on depression of the button D and on reaching the end of the insulating-layer J' moves freely along the path 2, 3 into engagement with the fixed contact K<2> under the tension of the spring F; on releasing the button D, the contact moves along the path 3, 4, engaging firmly under the upper curved end k of the contact. To open the circuit, the button D is again depressed, the contact K' moving along the path 4, 3, 5 and then, under the action of the spring F through an opening 0 in the contact K<2> to the position b, returning to its initial position a on the release of the button D. In order to prevent, on rapid depression of the button D, the contact K<1> from moving through the opening 0 and thus making only a short contact, a second insulating-step is arranged to catch the contact K<1> when closing the switch and only to release it and allow it to engage with the contact K<2> on the release of the button D. Auxiliary springs may be arranged at various points, for example at b, to strengthen the action of the spring F, and the contact K<1> may be guided over its path a, 1 ... 5, b, a by means of lateral guides instead of the insulating-layers above described. A spring S causes the button to follow the movements of the spring F and thus indicate whether the switch is ' on ' or ` off.'