Work holders – Magnetic holder
Patent
1981-07-24
1983-10-11
Watson, Robert C.
Work holders
Magnetic holder
335295, B25B 1100
Patent
active
044087527
ABSTRACT:
A switchable magnetic chuck has a magnet assembly slidably arranged in a casing to magnetize and demagnetize a top plate disposed in an open side of the casing. The top plate is provided with main pole members and auxiliary pole members which are arranged alternatively in the sliding direction of the magnet assembly, separated respectively by a non-magnetic separator disposed between them. To smoothen the change-over operation, enhance magnetic force under the magnetized condition and reduce residual attraction under the demagnetized condition, each main pole member is formed on the side facing the magnet assembly with an extension extending between the auxiliary pole member adjacent thereto and the magnet assembly.
REFERENCES:
patent: 1079546 (1913-11-01), Downes et al.
patent: 1222052 (1917-04-01), Walker
patent: 1330558 (1920-02-01), Simmons
patent: 3179858 (1965-04-01), Binder et al.
patent: 3258658 (1966-06-01), Vaughn
patent: 3336551 (1967-08-01), Steed
Horiuchi Kunio
Sakaguchi Hiroo
Shimizu Taketo
Tagami Mutsukazu
Uchikune Mamoru
Graybeal John O.
Kanetsu Kogyo Kabushiki Kaisha
Watson Robert C.
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