| 摘要 |
<p>The castor and a frame or stand comprises a tubular member, in which a plug is located in one end of the tubular member and is formed with a lateral bore, the tube having a hole aligned with the bore, and the castor having a pin providing a swivel axis of the castor and which passes through the hole and into the bore and is retained therein frictional engagement with the bore.</p> |
