| 摘要 |
A wheel assembly for a patio door comprises a carriage having two parallel spaced side plates 31, 33, and a wheel 39 rotatably mounted within the carriage by means of a pair of spaced ball- or roller-bearing sets, one at or adjacent each side thereof. …<??>The inner and outer races of the ball bearing sets are provided by inturned arcuate portions 32, 34 of the side plates and interior edge regions 45, 47, for example lined arcuate grooves, of the wheel respectively. …<IMAGE>… |
