| 摘要 |
A travel drive for a pulling engine of a single rail suspended railroad used in mines includes a pair of friction wheels and a pair of toothed wheels each of which is mounted on a common shaft with the respective friction wheels for joint rotation therewith about a vertical axis and for displacement along the common shaft between a retracted position in which the toothed wheel is accommodated in a protective chamber of the respective friction wheel, and a raised position in which the toothed wheel is capable of engaging an indented segment extending along the rail. A double-action cylinder-and-piston arrangement is so operatively connected to the respective toothed wheel as to be capable of raising and lowering the same. |
