Barrier for gateways and entrances to multistorey car parks, railway crossings and the like

摘要

In a barrier for gateways and entrances to multistorey car parks, railway crossings and the like, having a barrier boom (2) which is mounted on a housing (1) so as to be capable of swivelling about a horizontal shaft, a short lever arm (6) which is connected via a gearing (11) to a motor (12) attached to the housing (1) is attached to the barrier shaft (4) for driving the barrier. In order gradually to accelerate the movement process in the starting-up phase and gradually to decelerate in the closing phase, the lever arm (6) is provided with a guide slot (7) which extends radially with respect to the barrier shaft (4) and into which the roller (9) of a crank (8), which is connected to the gearing (11) and can be rotated through 270 DEG , engages. The axis of rotation (10) of the crank (8) is arranged in such a way that the crank (8) is located at right angles to the longitudinal axis of the guide slot (7) when the barrier boom (2) is in the horizontal and vertical position. The guide slot (7) associated with the crank drive is located in both limit positions tangentially to the circular movement path of the roller (9) of this crank (8) and intersects the circular movement path at the intermediate positions. This crank drive is suitable for different design types. In the case of designs in which the lever arm (6) extends in the direction of the longitudinal axis of the barrier boom (2), the axis of rotation (10) of the crank (8) is arranged under the guide slot (7). In the case of smaller designs, the guide slot (7) of the lever arm (6) and the longitudinal axis of the barrier boom (2) can enclose an acute angle of 45 DEG and the axis of rotation (10) of the crank (8) can be arranged over the guide slot (7). IMAGE