anchorably secured to the tubular member for holding the key in its locked condition and for transferring force across the slot in the tubular member upon the transmittal of torque between the shaft and tubular member application_number US 54063275 A description with reference to the drawings a key retaining device 10 embodying the principles of the present invention provides a torque transmitting couple between an elongated cylindrical shaft 12 and a tubular member 14 journalled thereon the shaft is bridgingly and freely pivotally supported in a fixed pair of laterally spaced bearings 16 and 18 which are schematically illustrated for illustrative convenience in this way an external force shown by the arrow identified by the letter a can be directed against a lug 20 integral with the tubular member to rotate the shaft in the direction shown by the arrow identified by the letter b such relationship is particularly useful in a vehicle brake pedal arrangement or the like as best shown in fig3 the key retaining device 10 of the present invention includes an arcuate notch 22 machined centrally in the cylindrical shaft 12 by a cylindrical cutter or the like and thereby providing a portion of a cylinder wall 24 therein an elongated slot 26 is similarly milled or otherwise formed in the tubular member 14 in such a manner that a pair of longitudinally spaced arcuate end walls 28 are provided therein upon axially and radially aligning the elongated slot and arcuate notch a woodruff key 30 is inserted therein the key includes an arcuate nose portion 32 which is centrally seated abuttingly against the wall 24 so that a longitudinally extending.