Pallet lever mechanism for timepiece escapement

摘要

A pallet lever mechanism for an escapement mechanism including a structure carrying a balance and an escape wheel, the pallet lever including pallet stones cooperating with the escape wheel, and a flexible, multistable element, and the pallet lever cooperates with the balance with horns of a first portion of the pallet lever connected by one such flexible element to the structure or to a second portion of the pallet lever carrying the pallet stones connected by one such flexible element to the fixed structure or to the first portion. One flexible element includes a prestressed beam buckled in an S or Z shape, the pallet lever mechanism including a pivot forcing the beam to have a node at the middle thereof.

主权项

1. A pallet lever mechanism for an escape mechanism, comprising:
at least one fixed structure carrying a balance and an escape wheel cooperating with each other, the pallet lever mechanism configured to limit or to transmit angular travel of the balance and/or of the escape wheel, the pallet lever mechanism including pallet stones cooperating with the escape wheel, and at least one flexible, multistable element, wherein cooperation of the pallet lever with the balance is achieved by horns of a first portion of the pallet lever mechanism, the first portion being connected by the at least one flexible element to a second portion of the pallet lever mechanism carrying the pallet stones, the at least one flexible element including at least one prestressed beam buckled in a mode wherein the beam adopts an S or Z shape, and the pallet lever mechanism including a pivot forcing the beam to have a node at the middle thereof, and wherein interaction between the horns and the balance, and/or the pallet stones and the escape wheel, is achieved with no contact or with attenuated contact, and wherein first surfaces of the horns and/or of the pallet stones are magnetized or electrized to cooperate in repulsion with opposing second surfaces of the balance and/or respectively of the escape wheel, which are made of suitable material and/or are magnetized or respectively electrized in a complementary manner.