Hydraulic door closer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Apr 17, 2003
app pub date -
Oct 16, 2001
filing date -
Oct 16, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to an improved structure of hydraulic door closer for easier operation and effectively eliminate oil leakage that allows fast adjustment of the of the spring load to the status of expected door closing speed by having provided on one connecting rod in a linkage base a pressure regulation mechanism for varying spring load, and having a rotation rod used to drive the spring in said mechanism to forthwith expose outside a flange of a hydraulic cylinder so to facilitate spring load regulation directly by turning of the rotation rod.
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