Door control apparatus
First Claim
1. Door operating means of the kind comprising an electric motor connectable to a mains power supply and a drive assembly operable by that motor to open and close a door characterised in that said operating means further comprise a second electric motor, an automatic clutch which when engaged, connects the second electric motor to enable it to operate the drive assembly to open the door, a second power supply, and means responsive to interruption of the mains power supply to energise the second electric motor from the second power supply and to engage the clutch.
1 Assignment
0 Petitions
Accused Products
Abstract
A fail safe mechanism for power operated doors comprises an auxiliary power supply, an electric motor, a self operating clutch to connect the motor to the door'"'"'s normal drive assembly and a relay/timer circuit to energize the motor in the event of a mains failure to enable the motor to drive the door open.
13 Citations
6 Claims
- 1. Door operating means of the kind comprising an electric motor connectable to a mains power supply and a drive assembly operable by that motor to open and close a door characterised in that said operating means further comprise a second electric motor, an automatic clutch which when engaged, connects the second electric motor to enable it to operate the drive assembly to open the door, a second power supply, and means responsive to interruption of the mains power supply to energise the second electric motor from the second power supply and to engage the clutch.
Specification