Escapement-type drive mechanism for watches and the like
AssigneeLes Fabriques d'Assortments Reunies
InventorChristian Faivre
Life of this patent
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Abstract
An escapement-type drive mechanism for watches and the like comprises an escapement wheel formed with a circumferential array of teeth spaced apart by respective radial slots and having displacement faces inclined to respective radii. An angularly oscillatable inverse anchor-shaped lever is engageable with the wheel for intermittently rotating it. The lever is formed with a pair of spaced-apart pallets (pins) mounted for lost motion on the lever and alternately engageable with the faces and receivable in the slots to step the wheel upon angular oscillation of the lever. Magnetic means on the lever yieldably biases each of the pallets in a respective direction of its lost motion relative to the lever.
Claims9
An escapement-type drive mechanism comprising:
- an escapement wheel formed with a circumferential array of teeth spaced apart by respective radial slots and displacement faces inclined to respective radii;
- an angularly oscillatable lever engageable with said wheel for intermittently rotating same, said lever being formed with a pair of spaced-apart pallets mounted for lost motion on said lever and alternately engageable with said faces and receivable in said slots to step said wheel upon angular oscillation of said lever;
- and
- magnetic means on said lever yieldably biasing each of said pallets in a respective direction of its lost motion relative to said lever, said lever being formed with a pair of elements each carrying a respective one of said pallets, and a single member fixed on said lever and magnetically cooperating with both said elements.
An escapement-type drive mechanism comprising:
- an escapement wheel formed with a circumferential array of teeth spaced apart by respective radial slots and displacement faces inclined to respective radii;
- an angularly oscillatable lever engageable with said wheel for intermittently rotating same, said lever being formed with a pair of spaced-apart pallets mounted for lost motion on said lever and alternately engageable with said faces and receivable in said slots to step said wheel upon angular oscillation of said lever;
- and
- magnetic means on said lever yieldably biasing each of said pallets in a respective direction of its lost motion relative to said lever, said lever being formed with a pair of elements each carrying a respective one of said pallets, and a member fixed on said lever and magnetically cooperating with said elements, said lever being formed with a pair of pins alternatively engageable between teeth of said wheel for locking said wheel relative to said lever in alternate extreme positions of said lever.
Dependencies are inferred from the claim text.