| 摘要 |
<p>The present invention provides a teetering castor mechanism (10) for a vehicular carriage, such as a trolley. The mechanism (10) comprises a steering shaft (14) pivotally mounted in a teetering coupling means for coupling the steering shaft (14) to a main frame (12) of the carriage such that the steering shaft is able to pivot about a substantially vertical axis. The mechanism (10) also comprises a castor wheel (22) rotatably supported on a support structure (24) mounted on said steering shaft. The teetering coupling means has a first component, in connection with which said steering shaft is mounted, and a second component fixed to said main frame. The teetering coupling means permits a degree of teetering of the steering shaft away from the vertical whereby, in use, movement of the main frame in any direction will be accompanied by teetering of the steering shaft and thereby trailing of the support structure, so that stable castoring action is facilitated.</p> |
