Machinery guards

Claim 1

THE COMBINATION OF AN EXTENSIBLE SHAFT COMPRISING TELESCOPICALLY-ASSOCIATED SHAFT PARTS, THE RESPECTIVE SHAFT PARTS HAVING ANNULAR GROOVES PROVIDING INNER BEARING RACES, TELESCOPICALLY-RELATED GUARD SHEATHS SURROUNDING SAID SHAFT PARTS AND EXTENDING ACROSS THE RESPECTIVE BEARING RACES, A RING ABOUT EACH SAID BEARING RACE, SAID RING HAVING THEREIN AT SPACED INTERVALS CIRCUMFERENTIALLY-SPACED HOLES ON RADIAL AXES AND REDUCING IN CROSS-SECTIONAL AREA AT THEIR INNER ENDS, SEATINGS AT SAID INNER ENDS, ROLLING MEMBERS LOCATED IN SAID HOLES AND BEARING ON SAID SEATINGS, SAID ROLLING MEMBERS HAVING A DIAMETER NORMAL TO THE ROLLING AXIS GREATER THAN THE DEPTH OF SAID HOLES, SAID ROLLING MEMBERS MAKING ROLLING CONTACT WITH SAID RESPECTIVE BEARING RACE, AN ANNULAR RESILIENT CLIP ENCOMPASSING SAID RING AND BRIDGING OVER SAID HOLES EXTERNALLY, MEANS ATTACHING SAID RING TO THE RESPECTIVE SHEATH TO THAT SIDE OF SAID RING IN THE DIRECTION TELESCOPING SAID SHEATHS, THE RESPECTIVE RESILIENT CLIP BEING ADAPTED TO BE OVERCOME BY RADIAL OUTWARD MOVEMENT OF THE RESPECTIVE ROLLING MEMBERS ON APPLICATION OF A SHARP AXIAL PULL ON THE RESPECTIVE SHEATH IN THE DIRECTION TELESCOPING SAID SHEATHS THEREBY TO UNSEAT SAID RESPECTIVE ROLLING MEMBERS FROM THE RESPECTIVE BEARING RACE AND PERMIT WITHDRAWAL ALONG THE RESPECTIVE SHAFT PART OF SAID RESPECTIVE SHEATH TOGETHER WITH SAID RESPECTIVE RING, ROLLING MEMBERS, AND RESILIENT CLIP, THUS TO EXPOSE SAID RESPECTIVE BEARING RACE.