741,628. Locking devices; freewheel clutches. WASSILIEFF, V. July 7, 1953 [July 8, 1952; Dec. 18, 1952], No. 18840/53. Classes 80(2) and 80(3) A frictional locking device between inner and outer elements which may be applied to elements having relative linear or rotary movement and which may be used in freewheel mechanism comprises at least one pair of co-acting wedging members spaced by at least two rolling members. According. to the construction shown in Fig. 1, which may be employed to prevent inadvertent release of vehicle brakes, a linearlymovable rod 2, operated by a control rod 87, is locked to a tube 1 against movement to the left by a pair of spring-pressed wedges 5, 5a engaging a pair of rollers 3, 4 carried by the rod 2, unwedging being effected, when required, by the end 10a of the rod 87. This rod is coupled to the rod 2 by a pin 88 engaging L-shaped slots in the rod 87, and a torsion and compression spring 91 normally biasses the pin 88 to the transverse portions of the slots so that the end 10a is clear of the wedges 5, 5a, and the rod 87, together with the rod 2, may be shifted only to the right. To release the lock the rod 87 is partially rotated to bring the pin 88 into the longitudinal portions of the slots to allow a relative axial movement between the rods so that the end 10a releases the wedges and the rod 2 may be pushed to the left. The spring 91 may engage a sleeve axially adjustable in the rod 87 to vary the compression of the spring. In a modification of this construction, Fig. 6 (not shown), two oppositely-acting pairs of wedges, interconnected by springs, cooperate with respective pairs of rollers carried by the rod 2 and are loosely housed in cut-outs in a control tube which is located between the rod 2 and tube 1 and has a lost-motion connection with the rod 2 so that the wedges engage the tube 1 and the rod is locked against movement in either direction relative to the tube 1 unless pulled or pushed by the control tube, when the initial movement of the latter causes the edges of the cut-outs to engage the wedges and release the lock. The control tube is spring-biased so that the wedges are normally centrally located in the cut-outs. In a further embodiment two coaxial rotary elements 1, 2, Fig 5, are locked for rotation together in one direction by three rollers which are held in a groove in the inner element 2 and which co- 'operate with two spring-loaded wedges 5, 5SP1/SP engaging the inner cylindrical surface of the outer element 1. Release is effected by two fingers 10, 10SP1/SP.
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