Ventilation devices, in particular smoke and heat ventilation de

Details Ventilation devices, in particular smoke and heat ventilation de Ventilation devices, in particular smoke and heat ventilation de

1975-04-21

1976-11-30

Downey, Kenneth

Movable or removable closures

Latch release of movement-stored energy

49 2, 16 54, E05F 106

Patent

active

039940969

ABSTRACT:
Ventilation device with a vent pivotally mounted in a frame and restrained against opening forces by a locking mechanism and also connected to the frame by a hydraulic brake or damper designed to gradually reduce the opening speed of the vent at least towards the end of the opening movement.

REFERENCES:
patent: 2434524 (1948-01-01), Swanson
patent: 2493116 (1950-01-01), Diebel
patent: 3512210 (1970-05-01), Ratcliffe
patent: 3800687 (1974-04-01), Nozawa

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