Adjustable device for translating rotary motion into linear motion

Claim 1

A MECHANICAL MOVEMENT DEVICE COMPRISING A FIRST SHAFT AND A SECOND SHAFT, SAID SHAFTS BEING OPERATIVELY CONNECTED FOR AXIAL MOVEMENT RELATIVE TO EACH OTHER, THE FIRST SHAFT BEING SCREW-THREADED AND THE SECOND SHAFT BEING HELD AGAINST ROTATION AND HAVING A CLUTCH-NUT THREADEDLY ENGAGED WITH SAID FIRST SHAFT, SAID NUT BEING AXIALLY FIXED RELATIVE TO SAID SECOND SHAFT, RESTRAINING MEANS NORMALLY HOLDING SAID NUT ROTATIONALLY FIXED RELATIVE TO SAID SECOND SHAFT WHEREBY RELATIVE ROTATION BETWEEN SAID FIRST SHAFT AND SAID NUT PROVIDES RELATIVE AXIAL MOVEMENT BETWEEN SAID FIRST AND SECOND SHAFTS, RESTRAINT-OVERCOMING MEANS ON SAID FIRST SHAFT FOR OVERCOMING SAID RESTRAINING MEANS UPON PREDETERMINED AXIAL MOVEMENT OF SAID SHAFTS RELATIVE TO EACH OTHER, THE OVERCOMING OF SAID RESTRAINING MEANS CAUSING SAID NUT TO ROTATE WITH SAID FIRST SHAFT RELATIVE TO SAID SECOND SHAFT TO DISCONTINUE RELATIVE AXIAL MOVEMENTS OF SAID SHAFTS, ADJUSTMENT MEANS FOR ADJUSTING SAID RESTRAINT-OVERCOMING MEANS LONGITUDINALLY OF SAID FIRST SHAFT, AND RELEASABLE LOCK MEANS FOR LOCKING SAID ADJUSTMENT MEANS IN ADJUSTED POSITIONS LONGITUDINALLY OF SAID FIRST SHAFT.