Safety device for a door system

Details Safety device for a door system Safety device for a door system

1987-07-10

1989-02-14

Kannan, Philip C.

Movable or removable closures

Safety means responsive to obstruction to closure

E05F 1502

Patent

active

048038075

ABSTRACT:
To provide, for a sliding door with a pneumatically operated door panel servomotor, a safety device which operates independently of the usual reversing device and which limits the maximally active door closing force to an exactly settable value in a simple and reliable manner, there is associated with the servomotor, a limit value control circuit with a closing force sensor which senses the reaction force of the servomotor acting on the door jamb side during the closing process and a sensor-controlled three-position control valve which freely vents the closing pressure side of the servomotor above a given response value of the closing force sensor.

REFERENCES:
patent: 3276164 (1966-10-01), Hilfing et al.

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