| 摘要 |
A combined wheel and brake assembly for shopping trolleys, etc. of the type where a stationary brake member is sandwiched between two freely rotating wheel discs (16, 17-the drawings show the assembly in end view). When the trolley enters a ramp escalator the discs (16, 17) fall between the escalator ribs (42, 46, 47) bringing the brake area (25) into contact with the escalator. The weight of the trolley forces apart the resilient ribs (40, 41) of the brake member which grip rib (42) of the escalator and prevent movement of the trolley.
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