A rail system comprises: a guide rail; a plurality of stationary electromagnets mounted in the guide rail; and a carriage having a plurality of wheels configured to travel along the guide rail. The wheels are magnets. Movement of the carriage along the guide rail is brought about by a fluctuating magnetic field generated by the stationary electromagnets acting on the wheels.

The preset invention relates to a gate with a crash-down prevention mechanism, comprising a gate panel which can be opened and closed by the rotation of a gate panel drive, a motor which is coupled to the gate panel drive, and a braking assembly with which opening and/or closing the gate panel can be decelerated, and a first measuring device for determining at least one movement parameter of the gate panel. In order to improve such a gate to the extent that a crash down of the gate can be reliably detected, and a braking assembly which brakes the gate quickly and avoids damage to the gate is triggered just as reliably, it is proposed to provide a second measuring device for determining at least one movement parameter of the motor, and a comparator which compares the measured movement parameters of the gate panel and the motor and triggers the braking assembly when the measured movement parameters of the gate panel and the motor fall outside of a defined relationship to each other.

The preset invention relates to a gate with a crash-down prevention mechanism, comprising a gate panel which can be opened and closed by the rotation of a gate panel drive, a motor which is coupled to the gate panel drive, and a braking assembly with which opening and/or closing the gate panel can be decelerated, and a first measuring device for determining at least one movement parameter of the gate panel. In order to improve such a gate to the extent that a crash down of the gate can be reliably detected, and a braking assembly which brakes the gate quickly and avoids damage to the gate is triggered just as reliably, it is proposed to provide a second measuring device for determining at least one movement parameter of the motor, and a comparator which compares the measured movement parameters of the gate panel and the motor and triggers the braking assembly when the measured movement parameters of the gate panel and the motor fall outside of a defined relationship to each other.

The present invention relates to a hydraulic door drive for a lifting door (1) that opens, in particular, vertically, comprising at least one hydraulic motor (6), adapted and configured to drive a door curtain (2) or to be at least concomitantly driven by the door curtain (2), at least one hydraulic unit (10) for supplying the hydraulic door drive (5) with pressurized hydraulic fluid (13; 13a), characterized by a pressure accumulator (22), wherein a) potential energy of the door curtain (2), which is released when the latter is closed, can be stored in the form of pressure energy in the pressure accumulator (22), and/or b) the pressure accumulator (22) can be loaded with pressure energy by means of the at least one hydraulic unit (10), wherein c) pressure energy stored in the pressure accumulator (22) can be discharged to the hydraulic motor (6) in order to at least open and/or at least close the door curtain (2).

The present invention relates to a hydraulic door drive for a lifting door (1) that opens, in particular, vertically, comprising at least one hydraulic motor (6), adapted and configured to drive a door curtain (2) or to be at least concomitantly driven by the door curtain (2), at least one hydraulic unit (10) for supplying the hydraulic door drive (5) with pressurized hydraulic fluid (13; 13a), characterized by a pressure accumulator (22), wherein a) potential energy of the door curtain (2), which is released when the latter is closed, can be stored in the form of pressure energy in the pressure accumulator (22), and/or b) the pressure accumulator (22) can be loaded with pressure energy by means of the at least one hydraulic unit (10), wherein c) pressure energy stored in the pressure accumulator (22) can be discharged to the hydraulic motor (6) in order to at least open and/or at least close the door curtain (2).

The centrifugal positive locking brake works inversely, that means, locking upon stopping and decoupling on start-up. When the drive motor is de-energized, the fixed ratchet(s) hit against at least one locking abutment on a locking disc positively fixed to the frame and lock the shutter. When voltage is applied, and with the associated quick start-up of the drive motor , the ratchet(s) disengage because of their inertia. This centrifugal positive locking brake for shutter drives is operated with a specially designed control method. After the power supply is interrupted, the ratchet(s) are drawn inward by the reloaded spring(s) so that they run against the locking abutment(s) and the shutter reliably locks in this position.

In example implementations, an adjustable speed operator governor release for a rolling fire shutter is provided. The adjustable speed operator governor release includes a shaft coupled to the rolling fire shutter, a gear on a first end of the shaft to engage a spring-loaded clutch during a fire, wherein the spring-loaded clutch is moved to disengage from a drive assembly and to engage the gear of the adjustable speed governor to operate the rolling fire shutter, and a linear speed adjusting mechanism coupled to the shaft and the gear to control a speed of free fall of the rolling fire shutter during the fire.

A displacement controlling device comprises a shaft having a displacement region, a movable unit connected to the shaft and configured to move within the displacement region, a damper connected to one end of the shaft, and a restraint unit arranged between the movable unit and the damper, wherein the restraint unit is configured to be driven by the movable unit from a first position toward a second position; the damper outputs a resistance when the restraint unit is at the first position, and the damper stops outputting the resistance if the restraint unit is at the second position.

A chain assembly includes a wheel secured on a shaft. A chain manually rotates the wheel and the shaft. A one way bearing has an inner race secured to the shaft and has an outer race that can freely rotate in only one direction in relation to the inner race. A brake drum is coupled to the outer race. Brake shoes are in operative contact with the brake drum to apply friction to the brake drum when there is relative motion between them. A brake adjuster adjusts the braking force applied by the brake shoes on said brake drum. The one way bearing is arranged to maintain the brake drum stationary in one direction of rotation of the shaft and rotate the brake drum in the opposite direction of rotation resulting in a degree of braking of the shaft as determined by the brake adjuster.

A chain assembly includes a wheel secured on a shaft. A chain manually rotates the wheel and the shaft. A one way bearing has an inner race secured to the shaft and has an outer race that can freely rotate in only one direction in relation to the inner race. A brake drum is coupled to the outer race. Brake shoes are in operative contact with the brake drum to apply friction to the brake drum when there is relative motion between them. A brake adjuster adjusts the braking force applied by the brake shoes on said brake drum. The one way bearing is arranged to maintain the brake drum stationary in one direction of rotation of the shaft and rotate the brake drum in the opposite direction of rotation resulting in a degree of braking of the shaft as determined by the brake adjuster.