A modular door drive control system for subjecting electrical drive motors to open-loop control and/or closed-loop control to open and close doors or door leaves in different applications includes at least one motor control unit, and a plurality of peripheral adaptation units for adapting the motor control unit or a plurality of the motor control units to match one of the different applications, where the motor control unit or a plurality of the motor control units are selectively connectable to each of the peripheral adaptation units to transmit electrical power for the drive motor, which is respectively connected to the motor control unit, via a common intermediate circuit such that door drive controllers for different applications can be realized with the aid of a modular door drive control system of this kind, without a relatively high level of expenditure on adaptation.

A sliding door drive system may include a drive axle and at least one idler axle spaced a part and parallel to each other. The sliding door drive system may further include a first pair of gears having a first radius, each of which is coupled to a different one of the drive axle and the at least one idler axle. The sliding door drive system may further include a second pair of gears having a second radius larger than the first radius. The sliding door drive system may further include a first drive belt coupled between the first pair of gears, and a second drive belt coupled between the second pair of gears. The sliding door drive system may further include a first door bracket coupled to the first drive belt and a second door bracket coupled to the second drive belt.

A sliding door drive system may include a drive axle and at least one idler axle spaced a part and parallel to each other. The sliding door drive system may further include a first pair of gears having a first radius, each of which is coupled to a different one of the drive axle and the at least one idler axle. The sliding door drive system may further include a second pair of gears having a second radius larger than the first radius. The sliding door drive system may further include a first drive belt coupled between the first pair of gears, and a second drive belt coupled between the second pair of gears. The sliding door drive system may further include a first door bracket coupled to the first drive belt and a second door bracket coupled to the second drive belt.

A device for preventing excess speed, which is caused by an energy store, of a door leaf, includes a door leaf displaceable between an open position and a closed position, an energy store coupled with the door leaf, which energy store provides energy for the closing movement of the door leaf in the event of failure of the electrical energy supply, a door drive coupled with the door leaf, wherein electrical energy can be induced in the door drive when closing movement of the door leaf takes place, and a door control, which activates the door drive and which is suitable for regulation of the speed of movement of the door leaf, wherein the door control is operable by the induced electrical energy when the electrical energy supply fails, and a method of operating an elevator door.

A roller (1) for elevator door hangers, comprising: a roller body (2) rotatable around a central rotation axis (X), said roller body (2) having an outer groove (4) destined to move along a guide rail, at least one insert (5) embedded within the roller body (2) and arranged below said groove (4).

A roller (1) for elevator door hangers, comprising: a roller body (2) rotatable around a central rotation axis (X), said roller body (2) having an outer groove (4) destined to move along a guide rail, at least one insert (5) embedded within the roller body (2) and arranged below said groove (4).

A sensor (1) which consists of a first electrode (3a), a ferroelectric layer (2) and a second electrode (3b) is described. The second electrode (3b) is connected to ground and the ferroelectric layer (2) is arranged between the first and second electrodes (3a, 3b).

A door safety system (3) for a door (2), having a safety component (10) arranged on a movable door element (4, 4a, 4b) of the door (2) and a supply component (11) arranged on a stationary door frame (5) of the door (2) for supplying energy to the safety component (10). The safety component (10) has an electric energy store (12) which is designed to autonomously supply electric energy to the safety component (10) when the door (2) is open, and the safety component (10) and the supply component (11) are designed to electrically charge the electric energy store (12) of the safety component (10) when the door (2) is closed.

A light grid for mounting on an elevator car door for object detection and for determining periodic door movements, including transmitter elements that emits radiation with a specific intensity, receiver elements for receiving the radiation from an assigned transmitter element, and a control device for evaluating the receiver elements in regard to interruption of the radiation coming from an assigned transmitter element and for outputting a signal for object recognition upon interruption. At least one receiver element is configured to output an intensity value for the received radiation. The control device evaluates the intensity value and distinguishes separate high, medium and low intensity value ranges with high, medium and low intensity values, and performs an alternation phase with at least one alternating from the low via the medium to the low intensity value range and to output a signal in the event of an alternation phase having been recognized.