| 摘要 |
The metal frame (1) carries a geared electric motor, driving the winding drum (9). The frame runs on grooved wheels (3,4), running on the rail (17) which is fixed to the edges of the stair treads. The drum (9) acts on a cable which leads over the pulleys (14,25) and is anchored at the top of the stairs. The outer end of the platform (7) is supported on the three-wheeled star-shaped stair-climber (19). The geared motor (11) is energised at each tread by the wheel (22) on the arm (21) contacting the next riser of the stair, closing a switch is so that the stair climber lifts the platform onto the next tread, when the motor is stopped. Safety brakes are provided.
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