Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Utility pole guide
Reexamination Certificate
2000-07-20
2001-11-13
Hail, III, Joseph J. (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Utility pole guide
Reexamination Certificate
active
06315270
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pulley for installing cables at a central office in a telephone system.
BACKGROUND OF THE INVENTION
A central office in a telephone system contains banks of batteries for powering the equipment in the central office upon a failure of the external power supply. Power cables for interconnecting the batteries and the telephone equipment are supported on overhead racks. The racks are ladder shaped structures that extend horizontally across beams defined by framing channels. The framing channels are suspended from the ceiling by threaded rods that are anchored to the ceiling.
Pulleys are used to guide the power cables over the racks when the power cables are being installed. Specifically, the pulleys are clamped onto the racks or the framing channels at locations suitable for the particular installation of power cables. The pulleys are removed when the installation is complete.
SUMMARY OF THE INVENTION
The present invention comprises a pulley apparatus, and particularly comprises a pulley apparatus for installing a cable on an overhead framework structure at a central office in a telephone system. The pulley is configured to be mounted on a threaded rod upon which the overhead framework structure is suspended from the ceiling of the central office.
Specifically, the pulley apparatus includes a guide structure which guides the cable longitudinally through the pulley, and further includes a bracket structure which mounts the guide structure on the threaded rod. In a preferred embodiment, the guide structure can be mounted on the threaded rod in a first position in which a cable can be moved transversely into and out of the guide structure, and can be alternatively mounted on the threaded rod in a second position in which the cable cannot be moved transversely into or out of the guide structure.
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patent: 6129340 (2000-10-01), Daniel
patent: 830717 (1952-02-01), None
Hail III Joseph J.
Marconi Communications Inc.
Wilson Lee
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