Railway rolling stock – Locomotives – With rack rail engaging drive
Reexamination Certificate
2008-11-05
2010-12-28
Le, Mark T (Department: 3617)
Railway rolling stock
Locomotives
With rack rail engaging drive
C104S089000, C104S094000, C238S123000
Reexamination Certificate
active
07856930
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 tracks defined by bottom flanges of 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 separately assembled gear rack held against the underside of one of the bottom flanges of the overhead rail by being attached to a series of vertical clamping plates which are each held against the side of the rail by threaded fasteners passed through each plate and received in a series of retainer blocks in a sideways facing T slot defined in either bottom flange to positively drive the carriage, trolley and upper hoist assembly along the rail. A stationary dual hoist system is also provided in which two hoist assemblies are interconnected by a chain and sprockets to provide synchronized operation.
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Benefiel John R.
Le Mark T
LandOfFree
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