Magnetic jack

Details Magnetic jack Magnetic jack

1981-09-28

1984-03-06

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Miscellaneous

310 12, B66F 300

Patent

active

044349688

ABSTRACT:
A magnetic jack comprising a body consisting of a series of slidably telescoped sections expandable along the jack axis, and a pair of electromagnets disposed between each successive pair of sections, each connected to one section, and having confronting poles of like polarity, so that they repel each other when electric current is supplied thereto, in order to extend the sections along the jack axis. The magnet pairs between successive pairs of body sections may be energized selectively, or the energizing current may be variably adjusted, in order to vary the height and force of the lift provided by the jack.

REFERENCES:
patent: 1672807 (1928-06-01), Etzel
patent: 2117264 (1938-05-01), Workman
patent: 3007676 (1961-11-01), Javorik
patent: 3158765 (1964-11-01), Polgreen
patent: 3185909 (1965-05-01), Jahn
patent: 3326610 (1967-06-01), Baermann
patent: 3454837 (1969-07-01), Rhodes
patent: 3763412 (1973-10-01), Detrick et al.
patent: 3941402 (1976-03-01), Yankowski et al.
patent: 4249115 (1981-02-01), Putt
patent: 4259653 (1981-03-01), McGonigal

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