Tool driving or impacting – Passage in manipulating handle for drive motor motive fluid – Motive fluid control valve in handle passage
Reexamination Certificate
2005-06-07
2005-06-07
Huynh, Louis K. (Department: 3721)
Tool driving or impacting
Passage in manipulating handle for drive motor motive fluid
Motive fluid control valve in handle passage
C173S168000, C173S170000
Reexamination Certificate
active
06902011
ABSTRACT:
Disclosed herein is a fluid control system for varying the power available to a fluid powered tool, a hydraulically driven impact wrench. The system disclosed herein varies power available to the tool by use of a bypass mechanism that is downstream of a directional control valve spool. Among other things, the advantageous placement of the bypass valve limits the thermal burden in the hydraulic circuit.
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Racine Hydraulic Tools—Product Catalog, 4 pages.
Fairmont—Product Catalog, 2 pages.
Chukwurah Nathaniel
FCI Americas Technology Inc.
Harrington & Smith ,LLP
Huynh Louis K.
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