Air lifting and balancing unit

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

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Details

254360, 254383, 254372, 254378, 60459, B66D 148, B66D 110, F16D 3102

Patent

active

054392004

ABSTRACT:
An air lifting and balancing unit including a cylinder, a piston in the cylinder, a ball screw affixed to the piston, a ball nut mounted for rotation on the ball screw, a drum mounted on the ball nut, a chain driven by the drum, and centrifugally actuated brakes mounted on the drum for stopping rotation of the drum when the drum exceeds a predetermined acceleration either due to a loss of load or to a loss of air pressure applied to the piston, and a pneumatic circuit in communication with the cylinder for providing air pressure thereto which applies a force on the piston which is at a substantially constant incremental value in opposition to the force exerted by the load applied to the piston through the chain and the drum and the ball screw regardless of variations in said air pressure to thereby cause the speed of the chain to remain substantially constant.

REFERENCES:
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patent: 3260508 (1966-07-01), Powell
patent: 3286989 (1966-11-01), Bangerter et al.
patent: 3428298 (1969-02-01), Powell
patent: 3457837 (1969-07-01), Powell
patent: 3526388 (1970-09-01), Geiger et al.
patent: 3656715 (1972-04-01), Powell
patent: 3669411 (1972-06-01), McKendrick
patent: 3675899 (1972-07-01), McKendrick
patent: 3773296 (1973-11-01), McKendrick
patent: 3791627 (1974-02-01), Stone et al.
patent: 3894476 (1975-07-01), Cobb
patent: 4061311 (1977-12-01), Yamasaki et al.
patent: 4478390 (1984-10-01), Knight et al.
patent: 4500074 (1985-02-01), Fox et al.
Columbus McKinnon Corp. brochure entitled LODEAIR, Manual 609-A, p. 13 Dec. 1992 (2 pages).
Zimmerman--Module-Air Series ZA Specifications, p. 7 (Date unknown) (2 pages).
Knigh Industries brochure entitled Lift Balance & Material Handling System (Date unknown) (4 pages).
Zimmerman Handling Systems brochure entitled The Strength Behind Material Handling Technology Mar. 1992 (9 pages).
Knight Industries device shown in attached FIG. 1 (Date unknown) (1 sheet).

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