Pallet assembly for Swiss escapement of timepiece, has pallet-stones whose respective rest faces are oriented to form null drawing angle, and return spring acting as bistable spring in intermediate position of pallet

摘要

The assembly has a return spring (5) fixed on a pallet (3) and a frame. Positions of fixation points of ends of the spring are chosen such that the fixation points are located on a straight line passing via a swivel pin (3e) of the pallet for enabling the spring to act as a bistable spring in an intermediate position of the pallet. An input pallet-stone (3a) and an output pallet-stone (3b) respectively comprise rest faces that are oriented to form a null drawing angle.