Patent ID: 6155324
Filing Date: 2000-12-05
Classification: A62C,E05F,E05Y,E06B

Abstract:
An apparatus connected to a door for shifting the door between a first position and a second position in response to an input signal, comprising:the door being mounted on an axle;a transfer system attached to the door and configured to move the door between the first position and the second position; andan operating mechanism, including:a brake selectively engaged with said transfer system and operatively configured to inhibit movement of the door from the first position to the second position, wherein said brake engages a chain operator which drives said axle to the first position and the second position, wherein said brake facilitates transfer of torque from the chain operator to the axle but not from the axle to the chain operator; anda clutch operable in a clutching mode and a declutching mode, said clutching mode engaging said brake to said axle and said declutching mode disengaging said brake from said axle, said clutch transferring from said clutching mode to said declutching mode in response to the input signal.