초록 ▼

An improved power driven conveyance intended primarily for use by handicapped persons or invalids. A power means to drive the conveyance on level surfaces at normal pedestrian speeds and or to ascend or descend conventional or irregular stairways at reduced speed and increased torque. The invention

An improved power driven conveyance intended primarily for use by handicapped persons or invalids. A power means to drive the conveyance on level surfaces at normal pedestrian speeds and or to ascend or descend conventional or irregular stairways at reduced speed and increased torque. The invention further contains a self-leveling chair which automatically maintains the occupant in a level seated position regardless of the inclined position assumed by the conveyance frame, thereby contributing to the stability of the conveyance and the safety of the occupant. A fail safe tractor belt means is provided to insure a positive grip between the stair treads and the conveyance. Frontal and rear auxiliary tractor belt units adjust the inclination of the main tractor belts to alignment with the angularity of the stairways and landings.

대표청구항 ▼

In a load carrying conveyance, the combination of: (a) a platform to receive the load; (b) main drive and caster wheels supporting the platform for mobility; (c) main endless belt tractor means supporting the platform for mobility; (d) lever means carrying auxiliary endless belt tractor means dispos

In a load carrying conveyance, the combination of: (a) a platform to receive the load; (b) main drive and caster wheels supporting the platform for mobility; (c) main endless belt tractor means supporting the platform for mobility; (d) lever means carrying auxiliary endless belt tractor means disposed on pivots forwardly and rearwardly on the platform and outwardly off-set from the main tractor means and said platform to be operatively clear of said main tractor means and platform to permit rotation of said auxiliary tractor means without interference contact with said main tractor means or platform; (e) power mechanism manually controllable by an operator for driving the drive wheels and the several tractor means, with said power mechanism operatable at a constant speed; (f) rotational means for rotating said lever means concentrically positioned with said pivots and means for driving said rotational means; and (g) mode conversion jack means manually controllable by the platform occupant for lowering the main endless belt tractor means until said main endless tractor belt means are in contact with the floor, and subsequently raising the main drive and caster wheels above the roots of the main endless tractor belt means, thus simultaneously converting the conveyance from a higher speed, level surface mode, to a lower speed, higher torque, stair climbing mode or vice versa, while remaining engaged to the main power mechanism operating at constant speed.