Anti-sway hydraulic system for grappler
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 4, 2003
Grant Date -
Sep 11, 2003
app pub date -
Mar 7, 2002
filing date -
Mar 7, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic system for actuating opposed arms of a grappler for a gantry crane dampens swaying motion of the arms. Within a conduit which carries pressurized fluid to and/or from actuators to pivot the arms, a dampener includes a restrictor having an orifice to restrict the flow in at least one direction. Each of the dampeners can include a respective check valve to permit free flow through one direction of the conduit and to direct reverse flow through the orifice. In a specific embodiment, a load is received between opposed arms of the grappler to seat upon shoes which extend inwardly from the arms. To urge the shoes to remain in secure lifting contact under the load, flow is restricted when the swaying load moves the arm outwardly, permit free motion of the arm when the swaying motion pulls the arm inwardly.
First Claim
Other Claims data not available
