Drill for a railroad rail having a four position and six way hydraulic control valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 20, 1999
Grant Date -
N/A
app pub date -
May 4, 1998
filing date -
May 4, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulically powered tool having a motor, a pump, and a hydraulic directional flow control valve. The valve has a frame and a rotatable spool with flow channels. The valve is provided as a four position, six way valve to provide four operational conditions for the tool including NEUTRAL, DRILL, RETRACT and FAST FORWARD.
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Cited Art Landscape
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