Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – By fluid pressure differential in conduit
Patent
1980-05-19
1986-06-24
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
By fluid pressure differential in conduit
A61M 2500
Patent
active
045963819
ABSTRACT:
Pull lines are utilized for installing electric wires in electrical conduit between junction boxes by attaching a pull line to the near end of a hollow-core line carrier having its forward end closed by a collapsible bag-like member of highly flexible plastic film or fabric. The bag-like member has a cross-section greater than that of the conduit and is inflatable through the trailing end of the line carrier so to maintain a yieldable continuous contact with the conduit interior wall about the line carrier as the carrier is moved through the conduit in response to a pressure differential created at one end of the conduit. In one form, the line carrier is a tubular sleeve of rigid or shape retaining material to which the pull line to be installed is attached; and, in a second form, it is a roll of the line itself which is disposed within the open end of the bag-like member. In a modification of the first form, the bag-like member is collapsed for storage within the sleeve.
REFERENCES:
patent: 1033587 (1912-07-01), Hodgman
patent: 1848269 (1932-03-01), Petersen
patent: 2794197 (1957-06-01), Crane
patent: 3056156 (1962-10-01), Immel
patent: 4202531 (1980-05-01), Hamrick
Thomas Industries Inc.
Watson Robert C.
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