US4043198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive displacement fluid flowmeter
Assignee: Individual
•
Filing: 1976-11-19
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Granted: 1977-08-23
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Expires: 1996-11-19
Abstract
Abstract A valving member is carried within the bore of a meter body having inlet and outlet ports. Chambers are formed within the bore on opposite sides of a piston slideably disposed about the valving member. In response to movement of the piston, valving member shifts axially within the bore to establish sequential periodic communication between alternate chambers and the inlet and outlet ports. After each shift, the valving member is latched by magnetic means.
Inventors
- 👤 Logan W. Stillwell
- 👤 George K. Riffle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:40
CPC Classifications
G; G01; G01F; G01F3/00; G01F3/02; G01F3/04; G01F3/14; G01F3/16; G01F9/00; G01F9/001; Y; Y10; Y10S; Y10S91/00; Y10S91/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
A positive displacement flowmeter for receiving fluid from a pressurized source thereof and for contnuously dispensing said fluid therefrom in precise volumetric increments, said flowmeter comprising: a. a body defining an axial bore and having first and second opposite ends closing said bore; b. an inlet port in said body for receiving said fluid; c. an outlet port in said body for discharging said fluid: d. metering means including: i. a valving member axially shiftable within said body, ii. a piston reciprocally slideable within said bore defining first and second volume chambers on respective sides thereof, said valving member shiftable in response to said piston between a first position for establishing communication between said first chamber and said inlet port and between said second chamber and said outlet port, and a second position for establishing communication between said second chamber and said inlet port and between said first chamber and said outlet port; and e. magnetic means exerting a predetermined force for alternately attracting and holding said valving member to said first position and said second position.
Claim 2
Dependent Claim
177 words
A positive displacement flowmeter for receiving fluid from a pressurized source thereof and for contnuously dispensing said fluid therefrom in precise volumetric increments, said flowmeter comprising: a. a body defining an axial bore and having first and second opposite ends closing said bore; b. an inlet port in said body for receiving said fluid; c. an outlet port in said body for discharging said fluid: d. metering means including: i. a valving member axially shiftable within said body, ii. a piston reciprocally slideable within said bore defining first and second volume chambers on respective sides thereof, said valving member shiftable in response to said piston between a first position for establishing communication between said first chamber and said inlet port and between said second chamber and said outlet port, and a second position for establishing communication between said second chamber and said inlet port and between said first chamber and said outlet port; and e. magnetic means exerting a predetermined force for alternately attracting and holding said valving member to said first position and said second position.
Claim 3
Dependent Claim
25 words
The flowmeter of claim 1, wherein the direction of travel of said reciprocating piston is reversed in response to a shift of said valving member.
Claim 4
Dependent Claim
41 words
The flowmeter of claim 1, wherein said magnetic means are sensitive to the reciprocal movement of said piston, and said valving member is released from said attractive force in response to said piston reaching the limit of travel in one direction.
Claim 5
Dependent Claim
14 words
The flowmeter of claim 1, wherein said magnetic means exert a continous attractive force.
Claim 6
Dependent Claim
47 words
The flowmeter of claim 1, further including biasing means for receiving and storing energy from said piston and for releasing said energy to said valving member in response to said piston reaching the limit of travel in one direction for urging a shift of said valving member.
Claim 7
Dependent Claim
23 words
The flowmeter of claim 5, wherein said energy stored in said biasing means is in equilibrium with said force of said magnetic means.
Claim 8
Dependent Claim
29 words
The flowmeter of claim 1, further including sensing means actuable by said metering means for emitting a signal in relation to the volume of fluid passing through said meter.
Claim 9
Dependent Claim
55 words
The flowmeter of claim 7, wherein said sensing means includes: a. a magnetically actuable switch positioned along said body; and b. magnetic means carried on said piston, whereby said switch is momentarily actuated as the piston passes in proximity of said switch thereby emitting a signal proportional to the volume of flow through the flowmeter.
Claim 10
Dependent Claim
23 words
The flowmeter of claim 8, wherein said sensing means is sensitive to the magnetic attraction between said valving member and said magnetic means.
Claim 11
Dependent Claim
20 words
The flowmeter of claim 7, wherein said sensing means is actuated in response to a shift of said valving member.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |