Door operator with locking mechanism
Device for securing the locked position of a motor-vehicle door
Pneumatic or hydraulic drive for opening and closing of doors
Pneumatic door operator having novel pneumatic actuator and lock Patent #: 4901474
ApplicationNo. 134065 filed on 08/13/1998
US Classes:49/281, Common actuator, different movements to unlatch and move closure49/246, Swings on plural axes; e.g., pivotal link arms49/248, Multiple links angularly related49/280, Motor driven105/332, Convertible open and closed105/341Entrance and exit control
ExaminersPrimary: Morano, S. Joseph
Assistant: Jules, Frantz F.
Attorney, Agent or Firm
International ClassesE05F 015/02
AbstractThe invention provides a door system for a transit vehicle. It has an actuator which provides a rotary motion about an axis of the actuator for moving the door panel between an open position uncovering the aperture and a closed unlocked position covering the aperture. The actuator also provides a linear motion along the axis of the actuator for moving the door panel between the closed unlocked position and a closed locked position. The rotary motion followed by the axial motion is provided by a cylinder having a piston moved by fluid pressure. The piston includes a guide track in its exterior which engages rollers in the cylinder. The guide track has one portion curving around the piston and one portion parallel to the axis. The curving part provides the rotary motion and the straight part provides the axial motion. When the rotary motion is completed the piston encounters a stop on a shaft which supports the door. The actuator then moves the door axially to engage locks.