Handling: hand and hoist-line implements – Utilizing fluid pressure – Venturi effect
Reexamination Certificate
2006-04-12
2009-06-09
Kramer, Dean J (Department: 3652)
Handling: hand and hoist-line implements
Utilizing fluid pressure
Venturi effect
C294S082230
Reexamination Certificate
active
07543868
ABSTRACT:
A method and apparatus are provided for vacuum-assisted lifting of a work piece or other object, through use of a lifting apparatus having a cylinder housing adapted at an upper end thereof for supporting a load, a piston rod moveable within the cylinder housing and having a lower exposed end thereof adapted for attachment to a suction cup device, in combination with a non-load bearing piston valve attached to the housing and operatively connected to be moved between an open and a closed position thereof by movement of the piston rod with respect to the housing. The piston valve is attached at an upper end of the housing, and adapted for movement between the open and closed position when contacted by an upper end of the piston rod, on successive strokes of the piston rod. The control valve is removable without disassembly of the remainder of the lifting apparatus.
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Kramer Dean J
Reinhart Boerner Van Deuren P.C.
The Caldwell Group, Inc.
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