Abstract: Guide projections 24 of protruding profile are disposed to the peripheral inside of a rubber crawler 10 so as to project out from an inner peripheral face of a rubber resilient body 12. Each of the guide projections 24 is configured with an indented portion 26. The indented portions 26 are open in the guide projections 24 on the peripheral inside.

Abstract: A dual motor axle driven system for powering a vehicle. A first battery pack provides power to a first electric motor and a second battery pack provides power to a second electric motor. A generator is connected to a differential gear train and the first and second battery packs. Rotation of the wheels transfers rotational kinetic energy to the differential gear train for conversion into electrical energy by the generator for recharging the first and second battery packs while the vehicle is in motion. A tachometer measures a revolution speed of a drive shaft. The vehicle is powered by the first electric motor when the measured revolution speed of the drive shaft is less than a threshold value and by both electric motors when greater than a threshold value. The generator recharges the second battery pack when the vehicle is powered by the first electric motor and vice versa.

Abstract: A universal elevating leg rest assembly for a wheelchair. The leg rest assembly includes an upper hanger plate mounted on a front tube member of the wheelchair. A lower hanger plate is mounted on the front tube member in a vertically-aligned, spaced-apart relationship with the upper hanger plate. A universal bracket assembly is pivotally mounted to the upper and lower hanger plates and allows the elevating leg rest assembly to be positioned on either the left or right side of the wheelchair. A latch mechanism allows the universal bracket assembly to be locked in place or unlocked, swung-away and detached from the wheelchair, if desired. A calf clamp assembly is hingedly connected to the universal bracket assembly. A release mechanism including an arcuate-shaped cam surface frictionally engages an arcuate-shaped cam surface of the calf clamp assembly to lock the leg rest assembly at a selected vertical position.