Tool with hydraulic valve system
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United States of America Patent
Stats
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Sep 11, 2012
Grant Date -
Feb 19, 2009
app pub date -
Apr 28, 2006
filing date -
Apr 28, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention relates to a hydraulic tool, in particular a rescue tool, provided with pivotable parts and with a hydraulic valve system having a double-action hydraulic cylinder connected thereto for driving the pivotable parts, wherein the hydraulic valve system comprises: —a differential valve element (K-7) for providing an increased speed of the outward plunger stroke of the double-action cylinder in a first position and for providing a normal speed thereof in a second position, combined with; —pressure-controlled non-return valves (T-I, T-2) for blocking the plunger of the double-action cylinder when hydraulic pressure is lost.
First Claim
Family
International Classification(s)
- E21D:SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAM....
- B26B:HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR....
- B25B:TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR,....
- F16D:COUPLINGS FOR TRANSMITTING ROTATION
- B66F:HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERW....
- A62B:DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- B25F:COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE P....
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Cited Art Landscape
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