Boots – shoes – and leggings
Patent
1983-02-24
1985-06-11
Chin, Gary
Boots, shoes, and leggings
364510, 239 74, 239156, 222613, G06F 1520, B05B 906
Patent
active
045232806
ABSTRACT:
An improved control system for a mobile material distribution apparatus of the type having a ground speed sensor, a distributing device for spreading material along the path of travel of the apparatus, a variable rate delivery structure for delivering material to the distributing structure and a delivery rate sensor. The control system comprises a calculating circuit responsive to signals developed by the ground speed sensor and delivery rate sensor and to a signal corresponding to a desired distribution rate of material for periodically calculating the difference between the desired delivery rate and the actual delivery rate and developing a difference signal. A control signal is developed in response to each difference signal for varying the delivery rate of material to the distributing structure as necessary to achieve the desired material delivery rate. The improvement comprises providing a control signal producing circuit responsive to the value of the difference signal being within a predetermined rate of values for developing the control signal as a cyclical signal having a duty cycle which varies in accordance with the value of the difference signal; this control signal producing circuit also being responsive to the value of the difference signal being below the predetermined range of values for accumulating the periodically developed difference signals until the sum of the values of these accumulated difference signals is within the predetermined range of values, and thereafter the control signal producing circuit develops the cyclical variable duty cycle signal in accordance with the sum of the values.
REFERENCES:
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patent: 3679098 (1972-07-01), Weiss
patent: 3782634 (1974-01-01), Herman
patent: 3877645 (1975-04-01), Oligschlaeger
patent: 4023020 (1977-05-01), Lestradet
patent: 4052003 (1977-10-01), Steffen
patent: 4177675 (1979-12-01), Friedenberg et al.
patent: 4220998 (1980-09-01), Kays
patent: 4230280 (1980-10-01), Leigh
patent: 4232255 (1980-11-01), Carlen
patent: 4392611 (1983-07-01), Bachman et al.
Published European patent application 0,068,606, published Jan. 1983, corresponds to U.S. application Ser. No. 264,147 filed May 15, 1981.
Chin Gary
Dickey-john Corporation
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