| 摘要 |
<p>A gravity driven vertical conveyor having passive breaking means associated therewith for limiting the speed of descent of the conveyor. The conveyor comprises a continuous chain (9) extending between upper (7, 8) and lower wheels (3, 4) a number of platforms (10) supported by the chain (9) for transporting a load downwardly and a hydraulic braking system (50, 80) associated with at least one of the wheels for limiting the speed of descent of the platforms (10). The hydraulic breaking system comprises a hydraulic fluid pump driven by one of the wheels which pump supplies fluid under pressure via an accumulator (56), a return valve (57) and a flow control valve (58) to disc brakes (53) to regulate the speed of descent of the platforms (10).</p> |
