Rotary motion apparatus

Claim 1

APPARATUS COMPRISING FIRST AND SECOND MEMBERS RELATIELY ROTATABLE ABOUT A COMMON AXIS, SAID SECOND MEMBER HAVING FORMED THEREIN AT LEAST ONE CONTINUOUS FLUID-RECEIVING GROOVE AND AT LEAST ONE SLOT EXTENDING TRANSVERSELY OF SAID GROOVE, AT LEAST ON BLOCK SEATED IN AND EXTENDING TRANSVERSELY FROM SIDE TO SIDE OF SAID GROOVE IN FIXED POSITION RELATIVE TO SAID FIRST MEMBER IN THE ANGULAR DIRECTION AROUND SAID AXIS, A VANE TRANSVERSELY MOVABLE IN SAID SLOT BETWEEN FIRST AND SECOND POSITIONS AT WHICH, RESPECTIVELY, SAID VANE OBSTRUCTS SAID GROOVE AND SAID GROOVE IS UNOBSTRUCTED BYSAID VANE, VANE GUIDE MEANS DISPOSED ADJACENT SAID SECOND MEMBER TO PROVIDE A SURFACE ADAPTED BY CONTACTING A CAM FOLLOWER ON SAID VANE TO INTERMITTENTLY MOVE SAID VANE TRANSVERSELY DURING RELATIVE ROTATION OF SAID MEMBERS SO AS TO POSITION SID VANE AT SAID SECOND POSITION WHEN PASSING BY SAID BLOCK AND AT SAID FIRST POSITION AT INTERVENING TIMES, PORT MEANS ON ONE SIDE OF SAID BLOCK TO ADMIT FLUID INTO THE GROOVE AND PORT MEANS ON THE OTHER SIDE OF SAID BLOCK TO DISCHARGE FLUID FROM THE GROOVE, THE IMPROVEMENT IN SAID MACHINE IN WHICH SAID SURFACE IS COMPRISED TO ONE SIDE OF THE CENTERLINE OF SAID BLOCK OF A DWELL PORTION AND A CAMMING SECTION BY WHICH, RESPECTIVELY, SAID VANE IS MAINTAINED TRANSVERSELY STATIONARY AND IS CAMMED TRANSVERSELY DURING SAID RELATIVE ROTATION, SAID PORTION AND SECTION HAVING A JUNCTION AT AN END OF SAID SECTION, SAID SECTION BEING BETWEEN SAID PORION AND CENTERLINE, SAID SECTION HAVING ADJACENT SAID JUNCTION A PROFILE CONFORMING TO A CURVE FOR WHICH BOTH THE FIRST AND THE SECOND DERIVATIVES OF THE TRANSVERSE DISPLACEMENT ON SAID CURVE WITH RESPECT TO THE CORRESPONDING ANGULAR DISPLACEMENT THEREON ARE EQUAL TO ZERO AT A POINT ON SAID CURVE COINCIDENT WITH SAID JUNCTION, AND THE THIRD DERIVATIVE OF TRANSVERSE DISPLACEMENT WITH RESPECT TO ANGULAR DISPLACEMENT FOR SAID SECTION HAVING A FINITE VALUE AT EVERY POINT ON SAID SECTION.