Handle control knob with automatic return for hydraulic power unit
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United States of America Patent
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N/A
Issued Date -
Dec 11, 2008
app pub date -
Jun 6, 2007
filing date -
Jun 6, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A rotatable control knob with automatic return, controls a valve of a hydraulic cylinder on a jack-stand power unit or a floor jack. The power unit includes a frame having the hydraulic cylinder secured at the rearward end. The control valve is rotatable in one direction for closing the valve to extend the cylinder, and is rotatable in a counter-direction for opening the valve to retract the cylinder. A tubular handle with a T-bar hand grip extends rearward and upwardly from the frame, with the control knob extending from the T-bar hand grip, and connected to a control shaft extending through the tubular handle to the control valve of the cylinder. The control knob automatic return, includes a torsion spring having one end fixed to the control knob and the other end fixed to the tubular handle. The control knob can be rotated in the counter-direction to open the valve; and when the knob is released, the torsion spring automatically forces the knob and shaft to rotate back to the original position to close the valve.
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