Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Patent
1986-06-26
1987-08-25
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
B65H 5900
Patent
active
046887628
ABSTRACT:
An installed electrical conduit is formed from a plurality of lengths of hollow conduit which are joined together by installing a plurality of conduit couplings having removably covered access ports spaced along the installed conduit through which the insulated electrical wires are to be pulled. The covered access ports are opened and lubricant is injected through these access ports at spaced intervals along the installed conduit. The electrical wiring is pulled through the lubricated conduit. The open access ports also allow the observance of the progress of the wire pulling; after the pulling operation is completed the access ports are closed. The ported couplings are preferably located in front of bends with respect to the intended direction of pulling to thereby provide lubricating points preceeding the bends around which the wires are to be pulled to facilitate the pulling operation. The access ports thus provide portals for injecting lubricant and enable visual assessment of the conduit interior as well as observing pulling progress. In those instances where a pair of metal "snakes" are slid into the installed conduit from both ends of the conduit, the access openings provide means for facilitating hooking together the inner ends of the shakes which are then used to pull insulated wires through the conduit. The method and apparatus described can be applied using different types of conduit such as metal tubing, threaded metal pipes or plastic conduit.
REFERENCES:
patent: 2095914 (1937-10-01), Brown
patent: 2490328 (1949-12-01), Van Fleet
patent: 3605947 (1971-09-01), Salerno et al.
patent: 4063617 (1977-12-01), Shenk
patent: 4331322 (1982-05-01), Woodruff
patent: 4412673 (1983-11-01), Ramsden et al.
patent: 4508371 (1985-04-01), Maier
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