Method and apparatus for operating a retractable arm

Details Method and apparatus for operating a retractable arm Method and apparatus for operating a retractable arm

G - Physics

05

D

G05D 3/14 (2006.01) B60Q 1/50 (2006.01) B60R 21/34 (2006.01)

Patent

CA 2282100

A method and apparatus for operating a reciprocating or retractable member driven by a motor, such as a school bus safety arm mechanism, includes a magnet mounted in fixed relation to the member and first and second magnetic sensors positioned so that the magnet is in actuating proximity of the first magnetic sensor when the reciprocating member is at its first limit of travel, and in actuating proximity of the second magnetic sensor when the reciprocating member is at its second limit of travel. The magnet thus actuates the sensors to stop the motion of the member at the selected limits of its path of travel.

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