Steel cable activated magnetic switch

Details Steel cable activated magnetic switch Steel cable activated magnetic switch

G - Physics

01

R

324/48, 324/60,

G01R 33/02 (2006.01) B65H 63/08 (2006.01) G01V 3/08 (2006.01) H01H 36/00 (2006.01) H02G 11/02 (2006.01)

Patent

CA 1270502

ABSTRACT An apparatus for detecting the absence of a magnetically permeable metal cable at a cable sensing site on a rotatable winding drum, comprising: at least a portion of the drum adjacent the cable sensing site being of a lower magnetic permeability than that of the cable; a permanent magnet secured to said portion of the drum adjacent the cable sensing site and oriented such that cable wound on the drum at the cable sensing site conducts magnetic flux between the poles of the magnet; a pole piece of high magnetic permeability projecting from a pole of the magnet to a magnetic field sensing position at a surface of the drum; and a stationary magnetic sensor mounted adjacent the drum and positioned to sense the presence of a magnetic field at the magnetic field sensing position.

548049

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