Traversing hoists – Overhead – Self-propelled trolley
Reexamination Certificate
2006-03-20
2008-12-23
Brahan, Thomas J. (Department: 3654)
Traversing hoists
Overhead
Self-propelled trolley
C700S213000
Reexamination Certificate
active
07467723
ABSTRACT:
A balancer hoist has an electric servomotor driving irreversible gearing in turn driving a hoist chain drive. A float mode and a manual mode are provided using two independent load sensors for sensing the load weight and force applied to a control grip. A traversing control is produced by a tractor carriage rolling on an overhead rail connected to a trolley also traveling on the rail and supported on upper hoist assembly. A load sensor interconnects the tractor carriage and upon hoist assembly to sense forces created by an operator pulling on the chain, which are used to control an electric motor on the tractor carriage driving a pinion gear engaged with a gear rack on the overhead rail to positively drive the carriage, trolley and upper hoist assembly along the rail. A stationary dual hoist system is also described in which two hoist assemblies are interconnected by a chain and sprockets to provide synchronized operation.
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Benefiel John R.
Brahan Thomas J.
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