| 摘要 |
The apparatus comprises a plurality of driven transport wheels (2) each suspended for rotation about a centerline (3) thereof and for pivotal movement about a steering axis (4) directed perpendicularly to the transport surface (1), and a string (5) passing over a driving and a driven sheave (6 and 2, 7, respectively). The driven sheave (2, 7) is pivotable along with the associated transport wheel (2). According to the invention, the string (5), between the driving and the driven sheaves (6 and 2, 7, respectively), passes closely to the associated steering axis (4) over divert rollers (8).
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