Abstract: A swinging power unit type motorcycle having an engine swingably hung and pivoted on a body frame, and a pair of plates forming a rear fork connected to the engine. A chain drive transmits power from the engine to a reduction gearbox which incorporates the rear wheel axle and is supported between the rear fork. Shock absorbers are connected between the body frame and the rear fork. The engine, rear fork, rear wheel axle, chain drive, and reduction gearbox are interconnected to swing as a unit relative to the body frame.

Abstract: A hub anti-escape device for a bicycle having a pair of supports, preferably dish-like shaped, which are inserted over a main shaft of a hub for the bicycle to be engageable with portions formed at the outer surfaces of a pair of fork ends of the bicycle frame respectively and subjected to a resistance above a given amount against movement of the supports in the radial direction, i.e., the direction in which the main shaft comes off the fork ends. A spring, mounted on the outside of at least one of the supports, urges the support towards the outer surface of the fork end, and is compressed with tightening structure for the hub, so that the device is adapted to prevent the escape of the main shaft from the two supports by the engagement of each of the supports with each of the fork ends even when the tightening structure loosens or the main shaft is not completely secured.

Abstract: A motorcycle swingarm is shown in which each arm is an extrusion of lightweight metal which in cross-section is a diamond with a cross rib and integral upper and lower fins. The upper fin is the larger, and is shaped to taper from both ends. The arms are bent slightly intermediate their ends, and at one end have a sleeve bearing welded thereto. At such one end, arcuate plates are also located between the arms and welded to them. At their other ends, each arm is slotted to receive an oblong slotted block which is welded to the arm. Also, the arms intermediate their ends have tabs welded thereto for providing connection points for shock absorbers and chain tensioners.

Abstract: A quick release assembly for supporting a bicycle wheel hub on a bicycle frame component. The assembly includes an elongated rod having an abutment nut threadedly disposed on one end thereof and a cam clamping assembly disposed on the other end. The clamping assembly includes a cup-shaped clamping head for rotatably supporting a cam member having an eccentric cam disposed within the cup-shaped clamping head. The eccentric cam is rotatably disposed in openings in a cylindrical reaction member. The cylindrical reaction member has a bore extending thereinto from one face to an annular flange adjacent the second face and the end of the rod has an enlarged head disposed in the bore of the reaction member and engaging the annular flange. The reaction member and the rod are separate members and the end of the rod has an arcuate recess concentric with the eccentric cam for engaging the eccentric cam to prevent rotation of the rod.

Abstract: A vehicle tire removing device including a tire iron connectable to a vehicle body in a fixed working position adjacent the tire to be removed from the rim of the wheel of the vehicle. The vehicle wheel may be rotated about its axle in a normal manner while the tire iron is in a working position to remove the tire from the rim of the wheel of the vehicle without removing the wheel from the vehicle axle. The vehicle tire removing device includes an improved fork means for bicycles and other vehicles having fork held wheel axles. The improved fork means provides a tire and the tube removal space between one end portion of the axle and one arm of the fork.