Impact-proof timepiece escapement

摘要

The escapement comprises an escapement wheel (1) and an anchor (2). In the place of the traditional limiting walls or pins, the escapement comprises, on the anchor (2) and/or the escapement wheel (1), means (17, 18) for limiting the oscillations of the anchor (2) during normal operation of the escapement. In order to prevent contact between the impulse beak (10) of the pallets (6, 7) and the escapement wheel (1) upon impacts, the escapement wheel (1) has protrusions (20, 21, 22) at its periphery.

主权项

1. A timepiece escapement having an escapement wheel (1) and an anchor (2), the anchor (2) comprising an entry pallet (6) and an exit pallet (7) cooperating with teeth (8) on the escapement wheel (1), each of the entry and exit pallets (6, 7) having a back side (9), an impulse beak (10), an impulse face (11) and a lock face (12), the anchor (2) and/or the escapement wheel (1) comprising means (17, 18) for limiting the oscillations of the anchor (2) during normal operation of the escapement to a range of displacement defined by an entry lock position where the entry pallet (6) blocks the escapement wheel (1) and by an exit lock position where the exit pallet (7) blocks the escapement wheel (1), wherein the escapement wheel (1) comprises, at a periphery, protrusions (20, 21, 22) arranged so that:
upon an impact having the effect of causing the anchor (2) to leave the said range of displacement in a first direction (F3), the impulse face (11) and the back side (9) of the entry pallet (6) can come into abutment on two (20, 21) of the protrusions (20, 21, 22) respectively and thus stop the anchor (2), without contact between the impulse beak (10) of the entry pallet (6) and the escapement wheel (1), and/or so that upon an impact having the effect of causing the anchor (2) to leave the said range of displacement in a second direction (F4), the impulse face (11) and the back side (9) of the exit pallet (7) can come into abutment on two (22, 20) of the protrusions (20, 21, 22) respectively and thus stop the anchor (2), without contact between the impulse beak (10) of the exit pallet (7) and the escapement wheel (1).