G - Physics – 11 – B
Patent
G - Physics
11
B
180/38, 352/20.8
G11B 5/02 (2006.01) G05D 1/02 (2006.01) G08G 1/0968 (2006.01) G11B 5/00 (2006.01)
Patent
CA 1158767
ABSTRACT A magnetic control strip recording device for vehicle control systems. A paving machine (12) lays a strip (10) containing magnetizable material. A wheel (30) rotates in response to the movement of machine (12). Magnets (34), (36) on the wheel and reed switches (38), (40) adjacent the wheel are activated in response to the movement of the wheel. An electromagnet (21) is energized when the reed switches (38), (40) are closed creating a magnetic pattern in the strip (10) of magnetized zones having alternating polarities for adjacent zones. An alternative magnetic pattern may also be produced by opening the optional dis- abling switch (44). The switches (38, 40) are preferably capacitively coupled to the electromagnet (21) to prevent undue drain on the power supply should the wheel (30) be stopped with one of the switches (38, 40) closed.
357919
Gowling Lafleur Henderson Llp
Schwarz Alfred V.
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