Precision load positioner with positive weight deviation...

Details Precision load positioner with positive weight deviation... Precision load positioner with positive weight deviation...

2007-01-30

2009-11-17

Lazo, Thomas E (Department: 3745)

Motors: expansible chamber type

With signal, indicator or inspection means

C060S413000, C073S862582

Reexamination Certificate

active

07617759

ABSTRACT:
An apparatus for bidirectionally translating and positioning loads under tension includes a linear hydraulic actuator suspendible from a hoist such as a crane and is useable to support, raise and lower heavy loads in precisely controllable small incremental distances. The apparatus utilizes a strain-gauge type load cell positioned between an upper end of the actuator and an upper anchor connector eye suspendible from a crane. A digital display device operatively coupled to the load cell provides an accurate indication of static weight of a load supported by a load connector eye attached to a lower end of a piston rod protruding from the actuator, and accurate and immediate indications of any load weight deviation resulting from contact of a load with an obstruction while being raised or lowered. A pressure relief valve is provided to enable flow of hydraulic fluid from the actuator cylinder to a fluid reservoir to prevent inadvertent over-pressuring of the cylinder.

REFERENCES:
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patent: 6474922 (2002-11-01), Bachman et al.

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