Pneumatic door closer

Details Pneumatic door closer Pneumatic door closer

2007-06-05

2011-11-08

Batson, Victor (Department: 3677)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Checks and closers

Pneumatic

C016S084000

Reexamination Certificate

active

08051534

ABSTRACT:
A pneumatic door closer for effecting the closing of an associated door having a controlled rate of a closing motion that is generally uniform, smooth and safe in moving from an opened to closed position of an associated door. The door closer includes an elongated cylinder with a displaceable piston defining a vacuum chamber and a pressure chamber within the elongated cylinder wherein the piston is normally biased toward a door closing position by a suitable spring. A piston rod connected to the piston has its free end extending through a rod opening that includes an air impervious seal formed about the piston rod extending therethrough. Disposed in communication with the vacuum chamber is a breather arrangement for diminishing in a controlled manner the level of vacuum being created within the vacuum chamber during the closing stroke of the piston to control the resulting resistance forces acting on the piston such that the closing speed is essentially uniform throughout the closing stroke.

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