Pneumatic motion regulator

Claim 1

A MOTION REGULATING DEVICE COMPRISING A DUALITY OF CONCENTRIC CYLINDERS, A PISTON RECIPROCATIVE THROUGH A STROKE IN THE INNER ONE OF SAID CYLINDERS, THE CIRCUMFERENTIAL WALL OF SAID INNER CYLINDER HAVING AN ELONGATED AXIALLY EXTENDING SLOT THEREIN PROVIDING FREE COMMUNICATION ON EITHER SIDE OF SAID PISTON DURING A PORTION OF THE STROKE THEREOF, AND RESTRICTED PASSAGE MEANS FOR SAID INNER CYLINDER IN THE CIRCUMFERENTIAL WALL THEREOF REMOTE FROM SAID SLOT, SAID RESTRICTED PASSAGE MEANS INCLUDING A RADIAL OPENING DEFINED BY AN OUTWARDLY FLARING FRUSTOCONICAL WALL, AND A RESTRICTOR MEANS FOR ASSOCIATION WITH SAID OPENING AND RESTRICTING THE COMMUNICATION THERETHROUGH, SAID RESTRICTOR MEANS HAVING A STEM AXIALLY ALIGNED WITH SAID OPENING, ONE END OF SAID STEM THREADABLY EXTENDING THROUGH THE WALL OF THE OUTER ONE OF SAID CYLINDERS, WHEREBY SAID STEM IS EXTERIORLY ROTATABLE AND UPON ROTATION THEREOF SAID STEM IS ADVANCED TO OR MOVED AWAY FROM SAID OPENING, A FIRST RADIALLY ENLARGED DISC FIXED ON THE OPPOSITE END OF SAID STEM IN SAID OPENING, A SECOND DISC SLIDABLY RECEIVED ON SAID STEM INWARDLY OF SAID FIRST DISC, SAID FIRST AND SECOND DISCS TOGETHER DEFINING A FRUSTOCONICAL MEMBER SUBSTANTIALLY COMPLEMENTARY TO SAID FRUSTOCONICAL WALL, AND A COIL SPRING INTERPOSED BETWEEN SAID WALL OF SAID OUTER CYLINDER AND SAID SECOND DISC FOR BIASING SAID SECOND DISC TO A POSITION OF NORMAL ENGAGEMENT WITH SAID FIRST DISC ELEMENT, WHEREBY UPON EXERTION OF FLUID PRESSURE WITHIN SAID FIRST CYLINDER SUFFICIENT TO OVERCOME THE FORCE OF SAID SPRING, SAID SECOND DISC ELEMENT IS MOVABLE RELATIVE TO SAID STEM TO A POSITION SPACED FROM SAID FIRST DISC ELEMENT FOR THEREBY REDUCING THE RESTRICTION IN SAID OPENING.