G - Physics – 01 – B
Patent
G - Physics
01
B
340/137.1
G01B 7/30 (2006.01) B66C 23/90 (2006.01)
Patent
CA 1040285
ABSTRACT OF THE DISCLOSURE There has been provided an improved Boom Angle Indication and Warning System for a crane, wherein a Boom Angle Transducer operatively coupled to the Boom produces an analogue output which when energized is proportional to the actual Boom Angle relative to a selected datum. The Boom Angle Transducer has an inertially governed pendulum driving a wiper for a calibrated potentiometer and variable selectable means establishes respective high and low analogue outputs proportional to Boom Angles corresponding to a Boom Angle range of operation. A meter indicator is selectively responsive to the actual Boom Angle Signal and also to the respective high and low angle outputs of the variable select- able means for providing visual indication of the transducer output and also the high and low outputs of the meter. Switching means selectively couples the transducer, and high and low angle outputs to the meter for providing said visual variable means and the meter provide energization therefor. The improvement comprises a test circuit operatively coupled to the supply and the meter for switching out the transducer and coupling to the meter a slowly increasing input signal produced thereby said signal corresponding to a simulated transducer voltage output over the entire range of the boom operation to allow the operator to observe the operation of the meter including the low and high points.
204744
Horn Robert
Paredes Candelario
LandOfFree
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