Hydraulic cylinder for telescopic arms
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United States of America Patent
Stats
-
Mar 25, 2003
Grant Date -
Jan 17, 2002
app pub date -
Jul 10, 2001
filing date -
Jul 11, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Hydraulic cylinder for telescopic arms, especially crane arms, consisting of a sleeve (1) closed by means of end covers (2) and (3); an internal piston (4) delimiting expansion (5) and retraction (6) chambers, a tubular shank (16) associated to the piston which protrudes through the cover (3) and which is closed by a head (17) which is provided with a pilot piston (21). Inside the tubular shank (16) runs a tube (18) which may be partially moved by the action of the piston (21). The inlet mouth of the cover (2) has a conduit (11) with a bushing (14), which moves when pushed by the tube (18). The conduit (11) and the tube (18) have orifices (13') in their wall.
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