| 摘要 |
A brake for locking a dolly caster wheel against rotation in either direction; the brake including a pair of parallel, spaced apart jam rollers each of which is carried on a frame, the frame being movable by means of a single push button so to move both rollers selectively in or out of a position wherein the rollers are jammed or wedged between the wheel periphery and a stationary bracket that forms a rigid part of the caster assembly.
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