| 摘要 |
<p>Simple, power operated, operator controlled, extendable ramp (7) at the entrance-way of a motor bus over which a wheelchair passenger may propel himself in entering or leaving the vehicle at a bus stop without the vehicle operator having to leave his seat. The motor bus (1) has a side door at its forward end which when opened accommodates laterally outward extension of a ramp (7) from a normally stowed position below the floor (9) of the bus, a portion of the ramp adjacent its outer end serving as a step (10) for entering the bus when the ramp (7) is in its stowed position (Fig. 1). Extending longitudinally of the ramp (7) and journalled therein at its outward end is a lead screw (12) which is rotatively driven by a rotary power motor (15) mounted to the inner end of the ramp (7). A nut (16) threadedly engaging the screw (12) is hingedly mounted to the lower end of a step riser (11) which is hinged at its upper end to the bus floor (9) so as to swing up to a position coplanar with the ramp (7) when the ramp is fully extended. A bell crank (23, 24) having an arm (23) underlying the ramp is actuatable by a fluid motor (25) to swing the inner end of the ramp (7) and lower end of the riser (11) upwardly to their co-planar relation when the motor (15) comes into abutment with the nut (16) during outward extending movement of the ramp (7). The outer end of the screw (12) is provided with wrench flats (14) to enable manual rotation of the screw (12) in case of power failure. Lamp (35) both conceals the opening (30) in riser (11) and illuminates the ramp (7). </p> |
