Synchronized transmission mechanism

Claim 1

SYNCHRONIZER CLUTCH MEANS FOR SELECTIVELY CLUTCHING A FIRST ROTARY MEMBER TO A SECOND ROTARY MEMBER AND TO A THIRD ROTARY MEMBER, SAID SYNCHRONIZER CLUTCH MEANS INCLUDING FRICTION CLUTCH ELEMENTS ENGAGEABLE WITH SAID SECOND ROTARY MEMBER AND SAID THIRD ROTARY MEMBER, AN EXTERNALLY SPLINED SYNCHRONIZER HUB CARRIED BY SAID FIRST ROTARY MEMBER, RADIAL RECESSES FORMED IN SAID HUB, A SEPARATE THRUST BAR DISPOSED IN EACH RECESS, AN INTERNAL LY SPLINED SLEEVE DRIVABLY CARRIED BY SAID HUB AND ADAPTED TO SLIDE AXIALLY RELATIVE THERETO, EXTERNAL CLUTCH TEETH FORMED ON EACH OF SAID SECOND AND THIRD ROTARY MEMBERS, A SPRING DETENT CONNECTION BETWEEN SAID SLEEVE AND EACH OF SAID THRUST BARS, SAID DETENT CONNECTION BEING ADAPTED TO TRANSFER AN AXIAL THRUST TO SAID FRICTION CLUTCH ELEMENTS, AND AN EXPANSION SPRING ENCIRCLING SAID FIRST ROTARY MEMBER, SAID SPRING BEING ADAPTED TO URGE SAID THRUST BARS RADIALLY OUTWARD INTO COOPERATING ENGAGEMENT WITH SAID SLEEVE, SAID SPRING BEING FORMED WITH AN AXIAL DEFORMATION AND ENGAGEABLE WITH ONE OF SAID FRICTION CLUTCH ELEMENTS WHEREBY A CLUTCH ENERGIZING FORCE IS APPLIED TO THE LATTER WHEN SAID SYNCHRONIZER CLUTCH MEANS ASSUMES A NEUTRAL, RELEASED CONDITION.