| 摘要 |
A floor member (10, 10', 124) of channel form is pushed downwardly to install it onto bearings (32, 32', 32'') which have been previously installed onto guide tubes (14) which extend in the same direction as the floor members (10, 10', 124). The bearings (32, 32', 32'') have sidewall portions (60, 62, 108, 110) which slope downwardly and outwardly to a lower edge (64, 66, 138, 140). These sidewalls (60, 62, 108, 110) are connected at their upper portions to the bearings (32, 32', 32'') in such a way that they will flex inwardly, into spaces provided for them, in response to the downward "snap on" movement of the floor members (10, 10', 124). Brace wings (48, 50, 130, 132) may be provided to function together with the lower edges (64, 66, 138, 140) to hold the floor members (10, 10', 124) onto the bearings (32, 32', 32''). Bearings (32, 32', 32'') themselves snap onto the guide beams (14). These bearings (32, 32', 32'') include lock flanges in the form of cantilever springs, resulting in a good tight fit despite size differences which may exist due to low manufacturing tolerances.
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