Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Reexamination Certificate
2006-11-14
2006-11-14
Marcelo, Emmanuel M (Department: 3654)
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
Reexamination Certificate
active
07134644
ABSTRACT:
The invention concerns a compressed air balancer (1) for raising, holding and lowering a load, comprising a cable drum (4) which is rotatable and displaceable along its axis of rotation for rolling up and unrolling a cable holding the load, a housing which preferably includes a cylindrical casing (2) and two end closure covers (3), a piston (7) which is subjected to the effect of gas pressure and which is displaceable axially in the housing; and a ball thread transmission which includes a ball rolling spindle (5) and a ball nut (6) and which converts an axial movement of the piston (7) into a rotary movement and axial movement of the cable drum (4). The compressed air balancer (1) is distinguished in that an external running surface of the piston (7) is formed by an internal surface (12) of a tube (8) which is fitted in the form of an internal sleeve into the cylindrical casing (2). Preferably a carbon fiber tube is used as the tube (8).
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Grossman Tucker Perreault & Pfleger PLLC
Marcelo Emmanuel M
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