Fly-back lever and fly-back heart assembly for use in fly-back mechanism in stop watch, has fly-back heart whose peripheral surface is located opposite to point that comprises recess in which pin is fixed without touching fly-back heart

摘要

#CMT# #/CMT# The assembly has a fly-back lever (4) whose one end (12) is attached with a fly-back heart (1) that comprises a round-shaped pin (16). Two sides of the pin comprise two plane faces (15). The pin and the plane faces cooperate in turn with a portion of the fly-back heart. A peripheral surface (18) of the fly-back heart is located opposite to a point (20) that comprises a recess (19) in which the pin is fixed without touching the fly-back heart when the plane faces of the end of the lever are in contact with the peripheral surface of the fly-back heart. #CMT#USE : #/CMT# Fly-back lever and fly-back heart assembly for use in a fly-back mechanism in a stop watch (all claimed). #CMT#ADVANTAGE : #/CMT# The peripheral surface of the fly-back heart is located opposite to the point that comprises the recess in which the pin is fixed without touching the fly-back heart when the plane faces of the end of the lever are in contact with the peripheral surface of the fly-back heart so as to ensure precise indexing of needles of a stop watch and a fly-back mechanism and reduce the possible dephasing between the needles and a restoring of the needle of the fly-back mechanism with respect to the needle of the stop watch in a precise manner. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a front view of a fly-back mechanism in an indexed position in which a needle of the fly-back mechanism with and a needle of a stop watch are superimposed. 1 : Fly-back heart 4 : Fly-back lever 12 : End of fly-back lever 15 : Plane faces 16 : Round-shaped pin 18 : Peripheral surface of fly-back heart 19 : Recess 20 : Point.