Reverse idler drive and interlock

Claim 1

IN A TRANSMISSION OF THE TYPE HAVING A TRANSMISSION CASE ENCLOSING SAID TRANSMISSION, A DRIVE SHAFT ROTATABLY SUPPORTED IN SAID TRANSMISSION CASE AND HAVING A DRIVING PORTION, SLIDING GEARS MOUNTED ON SAID DRIVE SHAFT AND SLIDABLE ALONG SAID DRIVING PORTION, SAID SLIDING GEARS INCLUDING A SLIDING GEAR UNIT, SAID UNIT HAVING A FIRST SLIDING GEAR, AND A SECOND SLIDING GEAR REARWARDLY OF AND UNITED WITH AND SPACED FROM SAID FIRST SLIDING GEAR, A REVERSE IDLER GEAR SHAFT SUPPORTED IN SAID TRANSMISSION CASE, A REVERSE IDLER GEAR UNIT, SAID UNIT HAVING A FIRST IDLER GEAR MOUNTED ON SAID REVERSE IDLER GEAR SHAFT AND A SECOND IDLER GEAR REARWARDLY OF AND UNITED WITH AND SPACED FROM SAID FIRST IDLER GEAR, SAID SECOND IDLER GEAR BEING POSITIONED TO MESH WITH SAID SECOND SLIDING GEAR, A COUNTERSHAFT ROTATABLY SUPPORTED IN SAID TRANSMISSION CASE, AND A DRIVEN GEAR ROTATABLY SUPPORTED ON SAID COUNTERSHAFT, SAID FIRST SLIDING GEAR BEING POSITIONED TO MESH WITH SAID DRIVEN GEAR IN THE FORWARD DRIVE POSITION AND SAID FIRST IDLER GEAR BEING POSITIONED TO MESH WITH SAID DRIVEN GEAR IN THE REVERSE DIRVE POSITION, SAID SLIDING GEARS BEING SO POSITIONED IN RELATION TO SAID DRIVEN GEAR AND TO SAID FIRST AND SAID SECOND IDLER GEAR THAT, WHEN SHIFTING INTO THE REVERSE DRIVE POSITION, SAID SECOND IDLER GEAR MESHES WITH SAID SECOND SLIDING GEAR PRIOR TO THE MESHING OF SAID FIRST IDLER GEAR WITH SAID DRIVEN GEAR, SO THAT SAID IDLER GEARS MAY BE TURNED BY ROTATION OF SAID SECOND SLIDING GEAR TO BRING SAID FIRST IDLER GEAR INTO POSITION TO MESH WITH SAID DRIVEN GEAR.