Motion-transmitting device

Claim 1

IN A DEVICE OF THE CLASS DESCRIBED, DRIVING AND DRIVEN MEMBERS DISPOSED FOR RELATIVE ROTATIONAL AND LONGITUDINAL MOVEMENT, ONE OF SAID MEMBERS HAVING A PERIPHERY FORMING HELICAL THREADING HAVING APPRECIABLE AXIAL LEAD, THE OTHER OF SAID MEMBERS COMPRISING A HOUSING HAVING AN OPENING THERETHROUGH FOR OPERATIVELY SURROUNDING THE ONE MEMBER, SAID OPENING COMPRISING FIRST, SECOND AND THIRD AXIALLY DISPOSED CYLINDRICAL PORTIONS, SAID FIRST AND SECOND CYLINDRICAL PORTIONS LYING IN ADJACENT COMMUNICATION WITH OPPOSITE OUTER EXTREMITIES OF THE OTHER MEMBER, SAID THIRD CYLINDRICAL PORTION BEING OF A SMALLER DIAMETER THAN THE OTHER TWO CYLINDRICAL PORTIONS AND LOCATED THEREBETWEEN, THE JUNCTURE BETWEEN THE ADJACENT CYLINDRICAL PORTIONS PROVIDING SHOULDER MEANS DEFINING OPPOSITELY AXIALLY FACING ANNULAR RACEWAYS, A PLURALITY OF ROLLER ELEMENTS HAVING AXIALLY SPACED-APART RADIALLY ENLARGED BEARING SURFACES CONNECTED BY A SHANK PORTION, SAID BEARING SURFACES STRADDLING THE THIRD CYLINDRICAL PORTION AND ENGAGING SAID RACEWAYS AND THE THREADING OF SAID ONE MEMBER AND BEING FREELY ROTATABLE RELATIVELY THERETO ABOUT AXES SUBSTANTIALLY PARALLEL TO THE AXIS OF SAID ONE MEMBER WHEREBY RELATIVE ROTATIONAL MOVEMENT BETWEEN THE MEMBERS PRODUCES RELATIVE TRANSLATORY MOVEMENT THEREBETWEEN.