| 摘要 |
<p>As a component for toy building sets there is provided a rotatable element comprising: (a) a base plate (FIGS. 1, 2, 6 and 7) and (b) a disc (FIGS. 3, 4 and 5) pivotally mounted in a circular aperture in the base plate. A socket for a pivot on the disc is located at the bottom of the base plate and is supported thereon by ribs integral with the socket and with four side walls at the bottom of the base plate. Four identical apertures in the bottom of the base plate are formed by the socket, the ribs and the side walls. Four engagement studs are provided on the top face of the disc and extend beyond the periphery thereof. The underface of these studs provides for slideable contact with the top face of the base plate during the rotation of the disc.</p> |
