Hydraulic dashpot
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United States of America Patent
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-
Sep 21, 2004
Grant Date -
Dec 4, 2003
app pub date -
May 21, 2003
filing date -
May 28, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic dashpot comprises, first, a cylinder and a piston. The cylinder (1) is charged with shock-absorbing fluid. The piston (3) is provided with ports and valves, is mounted on one end of a piston rod (2) and divides the cylinder into two chambers. The piston rod travels into and out of the cylinder and is provided with a central bore (20). The dashpot also comprises an adjustable bypass accommodated inside the piston rod or inside an extension (7) thereof. The bypass is provided with radial outlets (19, 23, 37) through the piston rod or extension. The cross-section of the bypass during the compression phase can be established independent of its cross-section during the suction phase and vice versa. There are two valves in the end of the piston rod near the piston or in the piston-rod extension. Each valve is provided with a rotating plunger (18, 21, 32, 33) with a rotary connection. Each plunger operates in conjunction with a radial inlet or outlet (19, 23, 27). An axially displaceable control rod (25) with a rotary connection at one or both ends is accommodated inside the bore that extends through the piston rod and can be alternately connected to the plunger connections.
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