Push button system for actuating functional actuating member placed inside case of e.g. electronic watch, has complementary guiding member connecting case and button head so as to partially resume operating efforts of system

摘要

The system has a button head (1) moved in translation with respect to a case (2). An actuation tappet (3) e.g. screw, is mounted to slide through an opening (4) in the case, where the opening connects the button head to a functional actuating member. A primary guiding member (5) in form of tube, is secured to the case and inserted partially into the opening, where the tappet slides in the guiding member. A complementary guiding member (6) mechanically connects the case and the head so as to partially resume operating efforts of the system during actuation and displacement of the head. The complementary guiding member includes a bush formed or covered with a self-lubricating synthetic material such as Teflon(RTM: PTFE).