| 摘要 |
The invention relates to a roller (1), preferably comprising two wheels (2) and a locking device, an activating part (10) being able to act on the locking device for releasing or locking in a position that corresponds to a directional lock and/or in a position that corresponds to a total lock, and the activating part (10) being movable by a drive, a linear movement of a transmission part (7) that is generated by the drive being transmitted via spring force to the activating part (10) in order to move the activating part, and the activating part (10), in any case in a position corresponding to the total lock or in any case in a position corresponding to the direction lock, being in addition movable relative to the stationary transmission part, against a spring supported on the transmission part, into a release position by means of an actuating handle (11) that is movable independently of the drive and preferably by hand so as to override the total lock or the directional lock. In order to provide a roller that is formed in an advantageous manner with regard to an emergency release, it is proposed that a geometric axis of rotation (d) of the actuating handle (11) is disposed on the same side as the activating part (10) with respect to the axis of rotation (D) of the wheel (2), the activating part being disposed offset, in a vertical section, with respect to an axis of rotation (D) of the wheel (2). |
