Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Patent
1985-09-24
1988-03-01
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
74 13, B65H 5900
Patent
active
047280794
ABSTRACT:
A cable pulling apparatus includes a driving sheave on which is wound a tow line detachably connected to one end of a cable to be pulled; a pulling device disposed between the driving sheave and the end of the tow line and adapted to pull the tow line, a tension detector disposed between the driving sheave and the end of the cable and adapted to detect the pulling tension in the cable, and a control means for controlling the traction device in accordance with the tension detected by the tension detector such that, when the tension detected by the tension detector is below a predetermined limit, the pulling speed is controlled to impart a tension which is comparatively small but large enough to prevent any slip of the tow line on the periphery of the driving sheave, whereas, when the tension detected by the tension detector exceeds the predetermined level, the pulling speed is decreased such as to cause a slip of the tow line on the outer periphery of the driving sheave.
REFERENCES:
patent: 3106325 (1963-10-01), Kitching
patent: 4372535 (1983-02-01), Gibson et al.
patent: 4456225 (1984-06-01), Lucas
patent: 4461459 (1984-07-01), Conti
patent: 4468003 (1984-08-01), Nonclerq et al.
patent: 4502666 (1985-03-01), Mattelon et al.
patent: 4508251 (1985-04-01), Harada et al.
patent: 4576362 (1986-03-01), Langston
Enari Tsutomu
Hasegawa Yasutaka
Kurashima Takeshi
Nitta Tadanori
Sekiguchi Nobuo
Nippon Telegraph & Telephone Corp.
Showa Elec. Wire & Cable Co.
Watson Robert C.
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