Swivelled cranks

Claim 1

IN CONBINATION WITH A REVOLVABLE SHAFT HAVING A TUBULAR END, A CRANK HAVING A FORWARDLY EXTENDING HANDLE AT ONE END AND REARWARDLY EXTENDING BOSS AT ITS OTHER END, SAID BOSS PROVIDED WITH A CHANNEL IN A DIRECTION ACROSS ITS REAR FACE, AT LEAST ONE END OF SAID CHANNEL BEING OPEN THROUGH A SIDE OF SAID BOSS, A SHANK EXTENDING FROM WITHIN SAID CHANNEL INTO THE TUBULAR END OF SAID SHAFT, SAID BOSS BEING PIVOTALLY SECURED TO SAID SHANK ABOUT AN AXIS SUNSTANTIALLY PERPENDICLUAR TO THE DIRECTION OF THE LENGTH OF SAID SHANK AND CAPABLE OF ONLY ROTARY MOVEMENT ABOUT SAID PIVOTAL AXIS, A CHANNEL FORMATION ACROSS SAID END OF THE SHAFT, A BEARING ELEMENT SECURED IN SAID SHAFT END, SAID SHANK BEING THROUGH SAID BEARING ELEMENT, SLIDABLE LENGTHWISE THEREON AND EXTENDING BEYOND SAID BEARING FURTHER INTO SAID TUBULAR SHAFT END, SPRING MEANS WITHIN SAID TUBULAR END BIASING SAID SHANK INTO SAID TUBULAR SHAFT END, SAID SHANK HAVING LATERAL SHOULDER FORMATION EXTENDING INTO AND ENGAGED BY SAID CHANNEL FORMATION WHEREBY THE CRANK IS HELD AGAINST PIVOTAL MOVEMENT IN RELATION TO SAID SHANK AND UPON MANUALLY PULLING THE CRANK TO MOVE THE SHANK IN A DIRECTION OUTWARDLY OF SAID TUBULAR SHAFT END, SAID SHOULDER FORMATION WILL LEAVE ITS COOPERATING CHANNEL FORMATION WHEREUPON THE CRANK IS CAPABLE OF SWIVELLING ABOUT SAID PIVOTAL AXIS.