Abstract: A roller skate comprising a platform formed from two aligned plate segments extending downwardly and aligned together to form a channel in an undercarriage support member; the said undercarriage support member having two slots for mounting a pair of roller wheels, front parts of the said platform having attached thereto a slidably adjustable plate, the said adjustable plate having attached thereto a first foot strap useful as a front foot support stabilizer; an adjustable rear bracket mounted on the rear of the said platform having a base and an upper section and a second foot strap on the said rear bracket useful for attaining ankle support structure, a pair of pivot bolts for attaching a leg support device for aiding in the support of the ankle; a pair of bumper stopping cushions located singularly on a bracket on each end of the said undercarriage for fast stopping.

Abstract: A manually operated clutch assembly for engaging and disengaging a rotatable cable drum in a winch assembly to a source of power which comprises a shifting lever with a two-directional rotatable hand grip which actuate a pair of push rods mounted on the said shifting lever, the said push rods controlling a latching pin in assembly with a clutch shifter with a yoke attached to the clutch shifter. The said yoke actuates a rotatable jaw clutch into a position to engage a rotatable cable drum. The said shifting lever simultaneously moves a locking rod into position to lock the axial movement of the jaw clutch.

Abstract: A winch clutch which comprises a cable drum, a power shaft with at least four slots spaced equidistant apart on the surface of the said power shaft; a cylindrical clutch housing having a bore, the said cylindrical clutch housing fitting around the said power shaft; four dowel pins spaced equidistantly and being located in the inner surface of the said cylindrical clutch housing; a clutch locking ring in assembly with steel balls, the said clutch locking ring being actuated by movement of a shifting yoke acting against a set of springs and moving said clutch locking ring causing the said steel balls to move the said dowel pins into the said slots in the said power shaft.

Abstract: A device for controlling skidding on roadway surfaces comprising anti-skid control means for regulating and controlling the braking system of the said vehicles; the said device being automatically responsive to changes in the drag in the said braking system; the said device comprising a first rotatable speed detector wheel mounted on a shaft with at least one permanent magnet embedded therein in the said first wheel, the said first wheel being in combination with a second rotatable wheel which is movably mounted on the said shaft the said second wheel having at least one cam follower for actuating the in and out movement of a coaxial switch plate which is electrically connected to and actuates a release valve in a pneumatic pressure chamber to release the brake chamber pressure therein, the said device being such that it controls the brake chamber pressure so that optimum lineal deceleration is maintained proportionally to the angular deceleration of the wheels respectively and maximum braking traction is mai