| 摘要 |
A wheel element for a toy building set has a substantially flat body from whose one face projects a plurality of equispaced parallel pins arranged in a plurality of mutually orthogonal rows and spaced apart by a distance corresponding to the pin diameter. The body has a circular periphery formed with an edge channel that acts as a seat for a tire ring. This ring is able to slide in the channel for use of the body as a wheel or the body can be constituted of two mutually rotatable members, one formed with the seat and one adapted to be anchored to some structure. It is also possible to provide both members with axially projecting oppositely directed connecting pins to allow the wheel to be used as a bearing between two structures. To this end the member carrying the tire can be formed of a pair of disks, one of which is annular and is provided with connecting pins over all of one face.
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