Hydraulically cushioned positive coupling

Claim 1

IN A TOOTH COUPLING, A FIRST ROTARY MEMBER, A SECOND ROTARY MEMBER COAXIAL WITH SAID FIRST MEMBER, MEANS MOUNTING SAID SECOND MEMBER FOR AXIAL MOVEMENT TOWARD AND AWAY FROM SAID FIRST MEMBER, MEANS FOR AXIALLY MOVING SAID SECOND MEMBER INTO ENGAGEMENT WITH SAID FIRST MEMBER, SAID MEMBERS HAVING A FIRST SET AND AN ENTRANT SET OF TEETH ON THEIR RESPECTIVE CONFRONTING ENDS, MEANS DEFINING A LIQUID CHAMBER AT ONE END OF ONE OF SAID MEMBERS, ONE OF SAID SETS OF TEETH BEING LOCATED IN SAID CHAMBER WITH THEIR TEETH SPACED A DISTANCE APPRECIABLY GREATER THAN THE LENGTH OF THE ENTRANT TEETH MEASURED FROM THE FRONT TO REAR FACES AT THE BOTTOM OF A TOOTH PLUS NORMAL TOOTH-CLEARANCE TOLERANCE TO COOPERATE WITH PORTIONS OF THE CHAMBER SURFACES IN DEFINING LIQUID TRAPS WHOSE LENGTHS MEASURED ALONG A CIRCUMFERENTIAL LINE ARE APPRECIABLY IN EXCESS OF THE LENGTH OF SAID ENTRANT TEETH WHICH ENTER SAID TRAPS SO THAT WHEN SAID SETS OF TEETH ARE ENGAGED BY AXIAL MOVEMENT OF SAID SECOND MEMBER THE IMPACT OF THE ENGAGING FACES OF SAID SETS OF TEETH CAUSED BY THE DIFFERENCE IN ROTATIONAL SPEEDS OF SAID MEMBERS IS ATTENUATED BY THE COMPRESSION OF THE LIQUID IN SAID TRAPS.