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 -
N/A
app pub date -
Nov 5, 2003
filing date -
Oct 16, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A door closer includes a casing having a recess in which a base is received, and a first cylinder and a second cylinder are in communication with the recess. A passage is in communication between the first and second cylinders so as to allow the hydraulic oil to flow between the two cylinders. The base includes a driving shaft for being connected to a door. A first rod and a second rod are pivotably connected to the base and respectively inserted in the first and second cylinders. A threaded rod is connected to a distal end of the first rod and a first spring is mounted to the first rod and the threaded rod. A sleeve is threadedly engaged with the threaded rod and an operation rod is securely connected to the sleeve so that when rotating the operation rod, the first spring is adjusted by moving the sleeve relative to the threaded rod.
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