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An electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors for being mounted over an opening for the doors. A rotatable input shaft has an electric motor secured to the input shaft for driving the input shaft, a worm centrally positioned on the motor sh

An electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors for being mounted over an opening for the doors. A rotatable input shaft has an electric motor secured to the input shaft for driving the input shaft, a worm centrally positioned on the motor shaft, and an electric brake mounted to the input shaft at an end opposite of the electric motor. A drum cam lifts a pinion from a worm gear disconnecting the worm gear from an output gear train in an emergency.

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1. An electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors comprising: a structure for being mounted adjacent an opening for the doors;a rotatable input shaft mounted relative to the structure, an electric motor secured to the input shaft for driving

1. An electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors comprising: a structure for being mounted adjacent an opening for the doors;a rotatable input shaft mounted relative to the structure, an electric motor secured to the input shaft for driving the input shaft, a first stage pinion positioned on the input shaft, and an electric brake mounted to the input shaft;an output shaft rotatable relative to the structure having a teeter mounted thereon with bearings at at least one end thereof for engagement with drive bars for opening and closing the doors, a gear fixed to the output shaft;a gear shaft rotatable relative to the structure, a first stage gear fixed to the gear shaft in a position to engage the first stage pinion, a second stage pinion with a sliding connection to the gear shaft enabling axial movement of the second stage pinion between engaged and disengaged positions;a second shaft rotatable relative to the structure, a second stage gear fixed to the second shaft and arranged for engagement with the second stage pinion, a third stage pinion fixed to the second shaft, said third stage pinion directly or indirectly transferring torque to the gear fixed to the output shaft;a drum cam shaft rotatable relative to the structure, a drum cam rotatably and axially movable relative to the drum cam shaft, a pin extending from the drum cam shaft engaging a cam slot in the drum cam, a lifting plate fixed to the drum cam and extending to engage a slot in the second stage pinion to move the second stage pinion between engaged and disengaged positions;a disengagement lever and engagement and disengagement cam fixed to the drum cam shaft, a pin extending from the disengagement lever; anda mechanical release fixed to a slotted end piece, the aperture in the slotted end piece receiving the pin extending from the disengagement lever,such that when the mechanical release is actuated, the drum cam shaft rotates the pin extending from the cam shaft and the drum cam moves to lift the lifting plate and second stage pinion to the disengaged position. 2. An electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors comprising: a housing with a base plate for being mounted over an opening for the doors;a rotatable input shaft mounted in the housing, an electric motor secured to the input shaft for driving the input shaft, a worm centrally positioned on the input shaft, and an electric brake mounted to the input shaft at an end opposite of the electric motor;an output shaft rotatable perpendicular to the input shaft having a teeter mounted thereon below the base plate with bearings at opposite ends thereof for engagement with drive bars for opening and closing the doors, a gear fixed to the output shaft;a worm gear shaft rotatable parallel to the output shaft, a worm gear fixed to the worm gear shaft in a position to engage the worm, a second stage pinion with a sliding connection to the worm gear shaft enabling axial movement of the second stage pinion between engaged and disengaged positions;a second shaft rotatable parallel to the output shaft, a second stage gear fixed to the second shaft and arranged for engagement with the second stage pinion, a third stage pinion fixed to the second shaft, said third stage pinion directly or indirectly transferring torque to the gear fixed to the output shaft;a drum cam shaft rotatable parallel to the output shaft, a drum cam rotatably and axially movable relative to the drum cam shaft, a pin extending from the drum cam shaft engaging a cam slot in the drum cam, a lifting plate fixed to the drum cam and extending to engage a slot in the second stage pinion to move the second stage pinion between engaged and disengaged positions;a disengagement lever and engagement and disengagement cam fixed to the drum cam shaft, a pin extending from the disengagement lever; anda cable sheath bracket for fixing the sheath of a release cable to the base plate, a release cable fixed to a slotted end piece, the aperture in the slotted end piece receiving the pin extending from the disengagement lever, a return spring urging the slotted end piece away from the cable sheath bracket,such that when the release cable is pulled, the drum cam shaft rotates the pin extending from the drum shaft and the drum cam moves to lift the lifting plate and second stage pinion to the disengaged position. 3. The electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors according to claim 2 in which the disengagement lever has an engagement and disengagement cam, the engagement and disengagement cam having spaced engagement cam surface portions and disengagement cam surface portions, an electrically operated actuator fixed to the structure for pulling a spring biased stop away from the disengagement lever,such that when the release cable is pulled, the disengagement lever is rotated and the rotation of the disengagement lever rotates the engagement and disengagement cam allowing the spring biased stop to enter the disengagement cam surface portion preventing return of the second stage pinion to the engaged position until the electrically operated actuator is activated. 4. The electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors according to claim 1 or 2 in which the drum cam slot has a cam lifting portion having a face that extends circumferentially and axially and at the ends thereof has substantially circumferential portions. 5. The electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors according to claim 1 or 2 wherein at least one target is attached to the output shaft enabling the electronic sensing of the open or closed positions of the teeter. 6. The electric door operator for opening and closing one or a spaced pair of transit vehicle passenger doors according to claim 1 or 2 wherein a target is attached to the engagement and disengagement cam enabling electronic sensing of the cam in the engaged or disengaged position. 7. The electric door operator for opening and closing a spaced pair of transit vehicle passenger doors according to claim 1 or 2 in which one or more intermediate gear stages are positioned between the second stage pinion and the gear fixed to the output shaft for transferring torque. 8. The electric door operator for opening and closing a spaced pair of transit vehicle passenger doors according to claim 1 or 2 in which a secondary actuator device may be connected to actuate an emergency release. 9. The electric door operator for opening and closing a spaced pair of transit vehicle passenger doors according to claim 1 or 2 in which the electric brake is spring applied and electrically released.