Speed responsive hydrostatic device

Claim 1

IN A SELF-PROPELLED VEHICLE HAVING A FRAME, AN ENGINE AND FIRST AND SECOND SETS OF WHEELS MOUNTED ON SAID FRAME, DRIVING MEANS INTERPOSED BETWEEN SAID ENGINE AND SAID FIRST SET OF WHEELS, THE COMBINATION THEREWITH OF A FLUID POWER TRANSMISSION AND CONTROL SYSTEM INTERPOSED BETWEEN SAID ENGINE AND SAID SECOND SET OF WHEEL COMPRISING, A FLUID PUMP, SAID PUMP HAVING FLOW CHANGING MEANS AND MEANS TO OPERATE SAID FLOW CHANGING MEANS TO MAINTAIN A SUBSTANTIALLY CONSTANT FLUID DISCHARGE PRESSURE WITHIN THE MAXIMUM CAPACITY OF THE FLOW CHANGING MEANS, AT LEAST ONE FLUID MOTOR DRIVINGLY CONNECTED TO SAID SECOND SET OF WHEELS , EACH OF SAID FLUID MOTORS HAVING FLUID PORTS OPERABLY CONNECTED TO SAID PUMP, EACH OF SAID MOTORS HAVING DISPLACEMENT CHANGING MEANS, AND SPEED SENSITIVE CONTROL MEANS TO OPERATE SAID DISPLACEMENT CHANGING MEANS TO CHANGE DISPLACEMENT OF SAID MOTOR IN RESPONSE TO SPEEC CHANGE.