| 摘要 |
INVENTOR: KARL BULA INVENTION: NET- OR CHAIN- LIKE VEHICLE TRACTION DEVICE FOR VEHICULAR WHEELS A vehicle traction device for rubber tired vehicular wheels, comprising traction means in the form of, for instance, a wire netting or chain equipped with a tightening mechanism for the traction means and effective at least at one side of the wheel in the circumferential direction in the mounted condition of the vehicle traction device. This tightening mechanism comprises a tensioning element extending in the circumferential direction of the wheel and elastically constructed at least over a part of its extent and a tightening or tensioning wire which likewise extends in the circumferential direction. One end of the tightening wire is fastened to a body member of a tightening lock of the tightening mechanism and the other end is guided through a blocking element arranged in the tightening lock. When the vehicle traction device is mounted, the blocking element allows displacement of the tightening lock relative to the tightening wire only in the sense of shortening the effective length of the tightening wire. An unlocking element cooperates with the blocking element, this unlocking element, when assuming its unlocking position, allows release of the tightening wire by the blocking element such that displacement of the tightening lock is also possible in the other direction. |
