Patent ID: 7228804

Claim:
A door system in a transit vehicle for at least partially covering and uncovering a door portal aperture of said transit vehicle, said door portal aperture having a first sealing means attached to at least one edge thereof, said door system comprising: (a) at least one door having a second sealing means disposed at a leading edge thereof; (b) a door drive means disposed within said transit vehicle for moving said at least one door in an opening and a closing direction, said door drive means including: (i) a rotatable drive spindle; (ii) a prime mover connected to one end of said drive spindle with a coupling means, said prime mover enabling rotation of said drive spindle, said prime mover is adapted for receiving a prime signal, said prime mover enabling compression of said first sealing means with said second sealing means to establish a first locked position which is a substantially closed and locked position; (iii) a drive nut engaging said drive spindle; (iv) a drive guide member disposed substantially parallel to said drive spindle; and (v) at least one hanger bracket coupled to said drive guide means and to said at least one door, said at least one hanger bracket adapted for linear movement about said drive guide means; said at least one hanger bracket having a connection with said drive nut, said at least one hanger bracket enabling substantially linear movement of said drive nut upon rotation of said drive spindle in said closing and said opening directions, said at least one hanger bracket further enabling movement of said at least one door in said closing and said opening directions to at least partially cover and uncover said door portal aperture; and (c) a brake having a stationary magnet, an armature axially disposed at a predetermined air gap X from said stationary magnet and attracted thereto by a force of the magnetic field over said predetermined air gap X to said magnet resulting in a frictionally engaged connection, a hub directly attached to said armature and to one of said prime mover shaft and said drive spindle for rotation therewith, at least one spring disposed between said armature and said hub, and a wiring connection for receiving said at least one brake signal, said brake maintaining said at least one door in a first locked position and maintaining a compression of said first sealing with said second sealing means produced by said door drive means, said brake adapted for receiving at least one brake signal for an application and a release thereof.