TODAY’S PATENT – DOOR OPENER FOR BUS AND THE LIKE
The DOOR OPENER was invented by William F. Blair (Midlothian, TX) and Patrick Downey (Fort Worth, TX) on the 1st of March 1983, bearing patent number US4375140A.
This invention relates to door openers for busses and the like. More particularly, it relates to door openers for buses having a pair of doors disposed on respective door shafts on each side of a door opening for being pivoted opened and closed as desired by an operator responsive to an operators switch at the control position.
The said invention work by connecting the two door shafts with a central door bell crank that would simultaneously open and close both the doors with a motor. The motor shall be connected to the central bell crank to provide controlled pivotal motion to the two door shafts. A safety override is adapted to disengage the motor to allow the door to be opened manually in the event of an emergency. The major objective of the invention is to allow for easier and safer operation of rear bus doors controlled by the driver with the help of an electric switch.