Braking apparatus for door closer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 2, 1989
Grant Date -
N/A
app pub date -
Nov 10, 1987
filing date -
Nov 10, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved door closer which prevents overly rapid closing due to an external force, such as wind pressure, being exerted on the door. A pair of oil holes are formed communicating with a first pressure chamber and a non-pressure chamber formed in the main cylinder of the closer. A slide valve is disposed in a communicating hole communicating with the oil holes and extending generally perpendicular to the cylinder. A head portion and a braking valve portion are formed on the valve rod of the slide valve at positions corresponding to the oil holes. An elastic member urges the slide valve in the direction opposite to the normal flow direction of the operating oil when the door is closing. An adjusting screw controls the position of the slide valve.
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