US3638832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic slowdown and cutoff system
Assignee: AERTRON Inc
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Filing: 1970-01-13
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Granted: 1972-02-01
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Expires: 1990-01-13
Abstract
Abstract A system for dispensing a precise quantity of a fluid. When power is applied to a motor, the motor drives a pump to dispense fluid at a relatively high rate. However, in response to an indication that a quantity of fluid, slightly less than the desired quantity, has been dispensed, power to the motor is substantially reduced. This slows the dispensing rate so that power may be removed from the motor and the pump stopped when precisely the desired quantity of fluid has been dispensed.
Inventors
- 👤 Charles R Sauber
- 👤 Roy A Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/06; B67D7/08; B67D7/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
In a fluid-dispensing system having pump means driven by a motor and signaling means indicating the operation of the pump means: the improvement comprising an automatic slowdown and cutoff system including a control module having means for presetting a predetermined quantity of fluid to be dispensed from said pump means, means for providing power to said motor to pump fluid at a predetermined rAte of flow, means responsive to signals from said pump means for indicating a first condition of said pump means, said first condition being the dispensing of a quantity of fluid which is less than said predetermined quantity by a precise amount, means for reducing the power to said motor to reduce the flow rate of said pump means when said first condition occurs, said means for reducing the power to said pump means including a cyclic power source, means responsive to the indication of said first condition for cutting off said power for a selected portion of each source cycle, and means responsive to a second condition of said pump means for terminating power thereto, said second condition being the dispensing of said predetermined quantity of fluid.
Claim 2
Dependent Claim
191 words
In a fluid-dispensing system having pump means driven by a motor and signaling means indicating the operation of the pump means: the improvement comprising an automatic slowdown and cutoff system including a control module having means for presetting a predetermined quantity of fluid to be dispensed from said pump means, means for providing power to said motor to pump fluid at a predetermined rAte of flow, means responsive to signals from said pump means for indicating a first condition of said pump means, said first condition being the dispensing of a quantity of fluid which is less than said predetermined quantity by a precise amount, means for reducing the power to said motor to reduce the flow rate of said pump means when said first condition occurs, said means for reducing the power to said pump means including a cyclic power source, means responsive to the indication of said first condition for cutting off said power for a selected portion of each source cycle, and means responsive to a second condition of said pump means for terminating power thereto, said second condition being the dispensing of said predetermined quantity of fluid.
Claim 3
Dependent Claim
73 words
The structure of claim 1 in which said means for cutting off said power for a selected portion of each source cycle includes trigger means operative when fired to apply a cutoff bias to said power, means normally preventing the potential applied to said trigger means from exceeding its firing threshold, and means responsive to said first condition for permitting said trigger means to fire at a selected point of said source cycle.
Claim 4
Dependent Claim
42 words
The structure of claim 1 in which said condition-indicating means is a counter including means for presetting said counter to indicate a predetermined quantity of fluid to be dispensed, and means responsive to the dispensing of said fluid for decrementing said counter.
Claim 5
Dependent Claim
40 words
The structure of claim 3 in which said counter includes a plurality of stages, and means operative when said counter stages are set to indicate said first condition for passing a signal through said counter to energize said power-reducing means.
Claim 6
Dependent Claim
30 words
The structure of claim 4 including means operative when said counter stages are set to indicate all values between said first condition and zero for maintaining said power-reducing means energized.
Claim 7
Dependent Claim
30 words
The structure of claim 4 including means operative when all of said counter stages are reset to zero for passing a signal through said counter to energize said power-terminating means.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |