The invention concerns a lock for doors or operationally similar structures the lock mechanism being manually actuated with the aid of pneumatic means without the need for external energy.
Pneumatic door lock.
More buying choices 35 97 3 new offers.
The pneumatic closer has a full 90 opening range and has an adjustable closing speed.
Door actuating mechanism us2800323a en 1951 10 02.
Nat pneumatic co inc.
Door operation and control us2733918a en 1956 02 07.
Pittsburgh plate glass co.
4 5 out of 5 stars 290.
Ideal security sk1730w sk1730 pneumatic heavy storm door closer white.
Use a single closer for light to medium weighted doors or a pair one on top and one at the bottom for heavier full view storm and screen doors.
Emco storm door closer kit in white color.
Cell doors corridors or entrances emergency exit doors.
United states patent 6106032.
Mount closer on all out swinging storm or screen doors by itself or paired with another standard duty closer.
Us2778632a en 1955 02 28.
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Vehicle door lock us2710186a en 1948 07 21.
Means for manually producing overpressure are rigidly connected to a door.