Door drive apparatus with locking mechanism for elevators

A door drive apparatus with locking mechanism for elevators having a car door movable by a drive means and in the door opening zone of floors connectable through a coupling mechanism with a shaft door, wherein the coupling mechanism includes an entraining parallelogram linkage mounted on a car door section and two coupling rollers respectively positioned at each shaft door, the drive means includes a drive motor mounted above the car driving a connecting gear which drives a drive belt which is connected with the car door through an actuating lever and fixes the car door in the closed and in the open positions, and the locking mechanism includes a pivotably mounted car door bolt which is monitored by a safety contact, is arrestable at an abutment, is locked by its own weight in a retaining position and which is urgeable into a releasing position by a control roller running up onto a control cam, comprising:

• an actuating lever pivotably mounted on an elevator car door and having one end articulately connected with a drive means for the car door and an opposite end coupled to an entraining parallelogram linkage;
• a pair of spaced apart abutments on the car door for limiting the pivotal movement of said actuating lever and defining open and closed positions of the linkage for coupling the car door to the shaft door thereby transmitting the movement of the car door to the shaft door;
• and
• a locking pawl pivotally mounted on the car door and held in a rest position against a support roller by a torsion spring, said support roller and said torsion spring mounted on the car and said torsion spring having one end attached to said locking pawl for moving said locking pawl to a locking position of the entraining parallelogram linkage after the opening of the car door.

A door drive apparatus with locking mechanism for elevators having a car door movable by a drive means and in the door opening zone of floors connectable through a coupling mechanism with a shaft door, wherein the coupling mechanism includes an entraining parallelogram linkage mounted on a car door section and two coupling rollers respectively positioned at each shaft door, the drive means includes a drive motor mounted above the car driving a connecting gear which drives a drive belt which is connected with the car door through an actuating lever and fixes the car door in the closed and in the open positions, and the locking mechanism includes a pivotably mounted car door bolt which is monitored by a safety contact, is arrestable at an abutment, is locked by its own weight in a retaining position and which is urgeable into a releasing position by a control roller running up onto a control cam, comprising:

• an actuating lever pivotably mounted on an elevator car door and having one end articulately connected with a drive means for the car door and an opposite end coupled to an entraining parallelogram linkage;
• a pair of spaced apart abutments on the car door for limiting the pivotal movement of said actuating lever and defining open and closed positions of the linkage for coupling the car door to the shaft door thereby transmitting the movement of the car door to the shaft door;
• and
• a clamping element articulately connected to said actuating lever and clamped to a drive belt of the drive means for the car door.

An apparatus for driving the door of an elevator car, comprising:

• a drive means mounted on an elevator car above a car door;
• an actuating lever coupled to said drive means;
• an entraining parallelogram linkage mounted on the car door and connected to said actuating lever, said entraining parallelogram linkage including a rigid cam and a movable cam, said movable cam having a rigid cam carrier and a ramp cam spaced from said rigid cam carrier by spring means, said ramp cam being compressible parallelly with respect to said rigid cam carrier, a control cam for a locking mechanism of the car door is connected to said ramp cam and a control roller is mounted on a car door bolt, and said car door bolt is pivotably mounted on a base plate for mounting the entraining parallelogram linkage on the car door;
• and
• abutment means mounted on the car door for limiting the movement of said actuating lever to define open and closed positions of said linkage.