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US3637116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-operated piston for metering gravity fed material
Assignee: Individual
•
Filing: 1970-02-09
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Granted: 1972-01-25
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Expires: 1990-02-09
Abstract
Abstract A pump piston in one cylinder is connected with a power piston operated by compressed air in a second cylinder rigid with the first, and a common rod connecting the pistons extends from the second cylinder so an adjusting screw abutting its end serves to give fine adjustments to the stroke to give accurate measurement of the amount of slurry dispensed in each operation. The slurry is delivered by gravity to the pump cylinder, and air operated valves control the communication between the pump cylinder and the gravity supply conduit and also between said cylinder and a discharge nozzle, where an air operated plunger clears the nozzle of slurry at the end of each discharge. A servo valve cooperates with two trip valves to control the air flow for operating the power piston, as well as the air-operated valves and nozzle plunger, one trip valve being operated automatically at the end of the forward stroke of the pistons to start the return stroke and the other being either operated automatically by a can moving into filling position or at the end of the return stroke of the pistons. The servo valve is of novel plastic construction, as are also the two trip valves. In the servo valve, the reciprocable slide valve is of a plastic material having appreciable lubricity in relation to the plastic material of the seat for easy operation and long wear, while in the trip valves both the body part with the valve projection on it and the fulcrummed arm that carries a valve seat gasket are of extremely hard rigid plastic material to avoid any flexing of the arm in the opening of the trip valve against the resistance of its return band, close accuracy of movement of this arm both ways being important for close accuracy of measurement of the material dispensed.
Inventors
- 👤 Russell G Rutherford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:26
CPC Classifications
B; B65; B65B; B65B3/00; B65B3/26; B65B3/30; B65B3/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
347 words
A dispensing apparatus of the character described comprising, in combination, coaxially arranged air and pump cylinders in fixed relationship to one another with interconnected pistons reciprocable therein, one piston being a power piston operable back and forth in the air cylinder by compressed air, the other piston being a pump piston adapted for drawing in flowable material on an intake stroke into the pump cylinder and discharging it on a return stroke, manually adjustable screw means for limiting the return stroke of the power piston whereby to predetermine the amount of material taken in and discharged by the pump piston in each reciprocation, a gravity source of flowable material supply above and connected with said material cylinder, a discharge nozzle, two-position valve means which in one position establishes communication between said pump cylinder and said material supply source and in its other position establishes communication between the pump cylinder and said discharge nozzle, a first piston and cylinder means for operating said two-position valve means by compressed air, a source of compressed air, a servo valve connected with the source of compressed air and including a reciprocable valve operable by a second piston and cylinder means by compressed air which reciprocable valve in one position supplies compressed air from Said source to operate said two-position valve means simultaneously with said power piston in one direction for an intake stroke of the pump piston and in the other position supplies compressed air from said source to operate said twoposition valve means simultaneously with said power piston in the opposite direction for the discharge stroke of the pump piston, first and second trip valves connected with opposite ends of said second piston and cylinder means for alternately relieving air pressure on one or the other end for causing back and forth movements of said reciprocable valve, said trip valves tending normally to close, means whereby one of said trip valves is operated to open position automatically upon arrival of said power piston at a predetermined position, and means for operating the other trip valve to start an operating cycle.
Claim 2
Dependent Claim
347 words
A dispensing apparatus of the character described comprising, in combination, coaxially arranged air and pump cylinders in fixed relationship to one another with interconnected pistons reciprocable therein, one piston being a power piston operable back and forth in the air cylinder by compressed air, the other piston being a pump piston adapted for drawing in flowable material on an intake stroke into the pump cylinder and discharging it on a return stroke, manually adjustable screw means for limiting the return stroke of the power piston whereby to predetermine the amount of material taken in and discharged by the pump piston in each reciprocation, a gravity source of flowable material supply above and connected with said material cylinder, a discharge nozzle, two-position valve means which in one position establishes communication between said pump cylinder and said material supply source and in its other position establishes communication between the pump cylinder and said discharge nozzle, a first piston and cylinder means for operating said two-position valve means by compressed air, a source of compressed air, a servo valve connected with the source of compressed air and including a reciprocable valve operable by a second piston and cylinder means by compressed air which reciprocable valve in one position supplies compressed air from Said source to operate said two-position valve means simultaneously with said power piston in one direction for an intake stroke of the pump piston and in the other position supplies compressed air from said source to operate said twoposition valve means simultaneously with said power piston in the opposite direction for the discharge stroke of the pump piston, first and second trip valves connected with opposite ends of said second piston and cylinder means for alternately relieving air pressure on one or the other end for causing back and forth movements of said reciprocable valve, said trip valves tending normally to close, means whereby one of said trip valves is operated to open position automatically upon arrival of said power piston at a predetermined position, and means for operating the other trip valve to start an operating cycle.
Claim 3
Dependent Claim
91 words
A dispensing apparatus as set forth in claim 1 including in combination with the discharge nozzle of a two-position plunger valve which in one stroke clears the discharge bore of said nozzle of any flowable material while cutting off its communication with said pump cylinder on the intake stroke of its piston and in the return stroke opens communication between the discharge bore of said nozzle and said pump cylinder on the discharge stroke of its piston, and means for reciprocating said plunger valve in timed relation to said pump piston.
Claim 4
Dependent Claim
46 words
A dispensing apparatus as set forth in claim 2 wherein the last-named means comprises a third cylinder and piston means connected with said two-position plunger valve and operable by compressed air from the reciprocable valve of the servo valve simultaneously with the other two-position valve means.
Claim 5
Dependent Claim
33 words
A dispensing apparatus as set forth in claim 1 wherein said trip valves are operable to open position in response to arrival of said power piston at the opposite ends of its stroke.
Claim 6
Dependent Claim
63 words
A dispensing apparatus as set forth in claim 1 wherein said trip valves are operable to open position in response to arrival of said power piston at the opposite ends of its stroke, one of the trip valves being adjustable relative to the other in accordance with the adjustment of said manually adjustable screw means limiting the return stroke of the power piston.
Claim 7
Dependent Claim
99 words
A dispensing apparatus as set forth in claim 1 including a discharge conduit between said pump cylinder and said discharge nozzle, said two-position valve means comprising interconnected coaxial valve plungers reciprocable transversely relative to and between the adjacent ends of said pump cylinder and said discharge conduit, these plungers in one position closing the end of said conduit but opening communication between said pump cylinder and said source of flowable material, and in the other position closing communication between said pump cylinder and said source of flowable material while opening communication between said pump cylinder and said discharge conduit.
Claim 8
Dependent Claim
49 words
A dispensing apparatus as set forth in claim 1 wherein one of said trip valves is operated to open position automatically upon arrival of the power piston at one end of its stroke, the other of said trip valves being operable in predetermined relationship to the first trip valve.
References Cited (Backward Citations)
US3180527A
Cited
US3227325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |