Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-10-22
1984-04-03
Brigance, Gerald L.
Communications: electrical
Condition responsive indicating system
Specific condition
340609, 7386118, 7386173, 310327, G01F 105
Patent
active
044411014
ABSTRACT:
A seed flow detector for use with a seed tube, comprised of a pin for extending radially into the seed tube, the end of the pin being orthogonally fixed to one face of a piezoelectric crystal transducer. Flexible resilient material is disposed against the other face of the transducer so as to damp mechanical vibrations below a predetermined frequency. Substantially no build-up of seeds or blockage of the seed tube results, mechanical vibration is substantially damped, while signals resulting from the impact of seeds against the pin are reliably generated.
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patent: 4312235 (1982-01-01), Daigle
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Brigance Gerald L.
Levine Alan H.
SED Systems Inc.
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