Communications: electrical – Systems – Call station
Patent
1976-07-02
1978-03-14
Swann, III, Glen R.
Communications: electrical
Systems
Call station
310321, 340261, 340267R, G08B 2100
Patent
active
040793621
ABSTRACT:
The monitor is used with seeder equipment having one or more seeder hopper sections wherein each hopper section has a number of metering assemblies for feeding the seed from each hopper section to the soil. The monitoring apparatus includes at least one sensor consisting of a piezoelectric transducer which provides an output signal in response to being struck by a seed, a vibration isolating mounting structure to position the sensor in the seed flow path between the metering assembly and the soil, and a circuit for receiving the sensor electronic response and providing an indication of seed flow condition. The mounting structure includes an elongated member such as a metal tubing, to one end of which is fixed a cushion made of a material such as a closed cell foam and to the other end of which is fixed a securing member to secure the structure to the seeder. The sensor is positioned on the cushion and a pair of leads connected across the sensor, pass through the tube and are connected to twin conductors at the other end. The circuit for each sensor includes a control circuit which processes the sensor signal and which provides an output control signal representing a flow condition such as the no flow condition. The circuit further includes visual and audio alarm circuits which indicate the flow condition for each sensor.
REFERENCES:
patent: 2875352 (1959-02-01), Orlacchio
patent: 3015977 (1962-01-01), Stegink et al.
patent: 3422413 (1969-01-01), Mason
patent: 3527928 (1970-09-01), Ryder et al.
patent: 3626402 (1971-12-01), Price
patent: 3832704 (1974-08-01), Kardashian
patent: 3863250 (1975-01-01), McCluskey, Jr.
patent: 3921159 (1975-11-01), Steffen
patent: 4004289 (1977-01-01), Kirk
Grimm Edward A.
Paulson Garry E.
Canadian Patents and Development Limited
Rymek Edward
Swann III Glen R.
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