US3792709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spread rate controller
Assignee: COMDELL Inc
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Filing: 1972-08-21
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Granted: 1974-02-19
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Expires: 1992-08-21
Abstract
Abstract Apparatus for sensing the rotational speed of a shaft and positioning a control device in a position predetermined relative to the speed of the shaft, the apparatus being particularly suited for the operation of mobile spreading equipment in which the spreading rate is controlled relative to the drive shaft speed of the vehicle. The controller converts the rotational speed of the shaft and the position of the control device to comparable electrical signals which are then compared to produce a resultant to effect further positioning of the control device. Both linear and nonlinear weighting is applied to produce the desired function in the resultant.
Inventors
- 👤 T Johnson
- 👤 E Dahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:40
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/06; G05D7/0617; G05D7/0623; B; B05; B05B; B05B9/00; B05B9/03; B05B9/04; B05B9/06; Y; Y10; Y10T; Y10T137/00; Y10T137/0971; Y10T137/1007
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
187 words
An electrical circuit comprising means to position a control device responsive to a tachometer in which said means to position comprises: a. First signal means connected to receive the output of said tachometer and provide a ramp voltage as a function of said output; b. second signal means connected to said control device to detect the operative position thereof and provide a second signal as a function of said position; c. comparator means connected to said first signal means and said second signal means for comparing said first signal and said second signal and providing an output signal as a result of said comparing; and, d. drive means connected to said comparator means to receive said output signal and position said control device responsive to said output signal, the output of said tachometer being a train of pulses and said first signal means comprising a ramp generator for generating a ramp voltage and a switching circuit connected to said ramp generator, said switching circuit connected to receive the output pulses of said tachometer and responsive to said pulses for reseting said ramp voltage to a reference level.
Claim 2
Dependent Claim
187 words
An electrical circuit comprising means to position a control device responsive to a tachometer in which said means to position comprises: a. First signal means connected to receive the output of said tachometer and provide a ramp voltage as a function of said output; b. second signal means connected to said control device to detect the operative position thereof and provide a second signal as a function of said position; c. comparator means connected to said first signal means and said second signal means for comparing said first signal and said second signal and providing an output signal as a result of said comparing; and, d. drive means connected to said comparator means to receive said output signal and position said control device responsive to said output signal, the output of said tachometer being a train of pulses and said first signal means comprising a ramp generator for generating a ramp voltage and a switching circuit connected to said ramp generator, said switching circuit connected to receive the output pulses of said tachometer and responsive to said pulses for reseting said ramp voltage to a reference level.
Claim 3
Dependent Claim
49 words
An electrical circuit according to claim 1 wherein said ramp generator is connected to said comparator to provide said first signal to said comparator and said electrical circuit further comprises means to enable said first signal to affect said drive means only at substantial peaks of said ramp voltage.
Claim 4
Dependent Claim
29 words
An electrical circuit according to claim 1 wherein said ramp generator comprises linearity controls whereby the curve of said ramp voltage can be adjusted to provide complex wave forms.
Claim 5
Dependent Claim
33 words
An electrical circuit according to claim 1 wherein said ramp generator comprises a capacitor and plural charging paths for said capacitor, at least one of said charging paths having a discontinuous charging characteristic.
Claim 6
Dependent Claim
200 words
A spread rate controller for controlling distribution of material from a moving vehicle comprising a control device and means responsive to the speed of the vehicle for positioning said control device comprising: a. A tachometer connected to a drive shaft of said vehicle for generating a train of pulses; b. a position sensor connected to said control device for providing a first signal as a function of the position of said control device; c. electrical circuit means connected to said tachometer for providing a second signal as a function of the repetition rate of said pulses; d. a comparator connected to said position sensor and said electrical circuit means so as to compare said first signal and said second signal and provide an output as a function of the comparison; and, e. drive means connected to said comparator and to said control device for changing the operative position of said control device responsive to the output of said comparator, said electrical circuit means comprising linearity control for providing complex functions to the generation of said second signal whereby spread rate is provided disproportionate to vehicle speed over a first speed range and proportionate to speed over a second speed range.
Claim 7
Dependent Claim
200 words
A spread rate controller for controlling distribution of material from a moving vehicle comprising a control device and means responsive to the speed of the vehicle for positioning said control device comprising: a. A tachometer connected to a drive shaft of said vehicle for generating a train of pulses; b. a position sensor connected to said control device for providing a first signal as a function of the position of said control device; c. electrical circuit means connected to said tachometer for providing a second signal as a function of the repetition rate of said pulses; d. a comparator connected to said position sensor and said electrical circuit means so as to compare said first signal and said second signal and provide an output as a function of the comparison; and, e. drive means connected to said comparator and to said control device for changing the operative position of said control device responsive to the output of said comparator, said electrical circuit means comprising linearity control for providing complex functions to the generation of said second signal whereby spread rate is provided disproportionate to vehicle speed over a first speed range and proportionate to speed over a second speed range.
Claim 8
Dependent Claim
192 words
A spread rate controller for controlling distribution of material from a moving vehicle comprising a control device and means responsive to the speed of thE vehicle for positioning said control device comprising: a. A tachometer connected to a drive shaft of said vehicle for generating a train of pulses; b. a position sensor connected to said control device for providing a first signal as a function of the position of said control device; c. electrical circuit means connected to said tachometer for providing a second signal as a function of the repetition rate of said pulses; d. a comparator connected to said position sensor and said electrical circuit means so as to compare said first signal and said second signal and provide an output as a function of the comparison; and, e. drive means connected to said comparator and to said control device for changing the operative position of said control device responsive to the output of said comparator, said electrical circuit means being further connected to said drive means and said drive means comprising switching circuits for changing drive to said control device only upon one of said train of pulses.
Claim 9
Dependent Claim
192 words
A spread rate controller for controlling distribution of material from a moving vehicle comprising a control device and means responsive to the speed of thE vehicle for positioning said control device comprising: a. A tachometer connected to a drive shaft of said vehicle for generating a train of pulses; b. a position sensor connected to said control device for providing a first signal as a function of the position of said control device; c. electrical circuit means connected to said tachometer for providing a second signal as a function of the repetition rate of said pulses; d. a comparator connected to said position sensor and said electrical circuit means so as to compare said first signal and said second signal and provide an output as a function of the comparison; and, e. drive means connected to said comparator and to said control device for changing the operative position of said control device responsive to the output of said comparator, said electrical circuit means being further connected to said drive means and said drive means comprising switching circuits for changing drive to said control device only upon one of said train of pulses.
Claim 10
Dependent Claim
43 words
A spread rate controller according to claim 6 wherein said electrical circuit means comprises means to detect an absence of said train of pulses, and to provide an override signal to said drive means to drive said control device to an ''''OFF'''' position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |