Material or article handling – Elevator or hoist and loading or unloading means therefor – Grab
Reexamination Certificate
2006-06-26
2009-06-30
Rodriguez, Saúl J (Department: 3652)
Material or article handling
Elevator or hoist and loading or unloading means therefor
Grab
C414S911000, C091S514000, C091S515000, C137S101000, C294S082230
Reexamination Certificate
active
07553120
ABSTRACT:
A hydraulic grip-control unit provided with at least two gripping arms driven hydraulically to seize loads while cooperating with a striker arm of the grip with the control unit in use being connected hydraulically between a hydraulic fluid source under pressure and hydraulic cylinders each of which drives a gripping arm to form a closed supply circuit in which the source feeds fluid to the cylinders connected hydraulically in parallel and with the unit including a flow divider connected along said supply circuit between said source and said cylinders to apportion the flow of the circuit between the cylinders in parallel. The divider has a nominal flow lower than the nominal flow of the control unit with the control unit also including a by-pass circuit connected in parallel to said divider, which can take on an operative configuration in which it can be traveled by fluid and a nonoperative configuration in which it cannot be traveled by the fluid with the control unit including automatic by-pass circuit piloting means designed to pilot it in the non-operative configuration when the flow required by the supply circuit is substantially lower than the nominal flow of the divider and in the operative configuration when said required flow is substantially higher than that of the divider.
REFERENCES:
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patent: 2005/0063811 (2005-03-01), Seaberg
patent: 2006/0073001 (2006-04-01), Chase
Auramo Oy
McGlew and Tuttle , P.C.
Rodriguez Saúl J
Snelting Jonathan
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