Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes fluid supporting ram in drive-means
Reexamination Certificate
2007-11-27
2007-11-27
Cuomo, Peter M. (Department: 3654)
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes fluid supporting ram in drive-means
C187S275000, C091S515000, C060S546000, C060S562000, C414S585000
Reexamination Certificate
active
09873243
ABSTRACT:
A hydraulic platform lift, having hydraulic pump means and first and second hydraulic cylinders each having a piston member therein, each operatively coupled to a respective side edge of a platform to permit raising and lowering of the platform. A positive displacement valve is further provided, with the hydraulic platform lift and comprises a pair of juxtaposed cylinder members, each containing a longitudinally-movable piston, such pistons operatively coupled to each other so that movement of one piston causes an equal movement of the other. The positive displacement valve is adapted, when the pump means provides pressurized hydraulic fluid via a respective aperture to a first side of each of the pistons, to cause the pistons to be displaced an equal distance causing an equal egress of hydraulic fluid from the cylinder members via a respective aperture.
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Hydraulics, Theory and Applications, BOSCH Automation (3 pages).
Cuomo Peter M.
Gowling Lafleur Henderson LLP
Horne D. Doak
Kruer Stefan
Saf-Holland Equipment Limited
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