Patent ID: 7527424

Claim:
An anti-trip device associated with a timepiece escapement of a timepiece, wherein the timepiece escapement includes: (a) a balance disposed to oscillate on a support via an arbour; (b) a balance spring fixedly attached to the balance and to the support, wherein the anti-trip device is disposed to prevent angular extension of the balance beyond a normal angle of rotation, wherein the balance spring extends around the arbour, and wherein the arbour fitted to the balance is provided with a pinion meshing with the anti-trip device, wherein the anti-trip device includes means for preventing the balance from rotating beyond the normal angle of rotation whatever the direction of the rotation; (c) an escapement wheel provided with teeth; and (d) a pallet carrying locking pallet-stones, wherein said teeth rest in turn on the locking pallet-stones, wherein the means for preventing the balance from rotating beyond the normal angle of rotation comprises a multi-toothed wheel or a multi-toothed sector independent from the pallet, wherein the multi-toothed wheel or multi-toothed sector is pivoted in a fixed plate disposed in the timepiece.