Patent US3700359A successfully refreshed from Google Patents.
US3700359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosion-proof liquid fuel pump
Assignee: Science Inc
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Filing: 1971-05-18
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Granted: 1972-10-24
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Expires: 1991-05-18
Abstract
Abstract A double acting piston type liquid fuel pump is driven by an integrally constructed coaxial flexible-diaphragm gas piston within a dual compartment chamber. The compartments are alternately connected to a vacuum or pressure source through a reversible toggle valve operated by movements of the diaphragm.
Inventors
- 👤 John A Vanderjagt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:43
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/12; F04B53/125; F04B53/127; F01; F01B; F01B25/00; F01B25/02; F01L; F01L23/00; F02; F02M; F02M1/00; F04B5/00; F04B5/02; F04B9/00; F04B9/08; F04B9/12; F04B9/1207; F04B9/1222; F04B9/129; F04B9/131; F04B9/133; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/438; F02M2700/4388; F02M2700/439
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
342 words
A double acting liquid fuel pump of the reciprocating piston type comprising in combination: A. a liquid pumping chamber comprising first and second sealed compartments separated by a first piston slidably movable therebetween, B. A vacuum chamber comprising first and second hermetically sealed compartments separated by a second piston movable therebetween, C. a linearly reciprocable piston shaft common to said first and second pistons, and having one end thereof extending through a wall of said first sealed vacuum compartment, D. first valve means connected to and operable by said extending piston shaft end, and movable between first and second operating positions, 1. means on said valve for connection thereof to a vacuum line, 2. means connecting said valve when in a first position to said first vacuum compartment, 3. further means connecting said valve in its second position to said second vacuum compartment, E. first and second liquid release valves in said first and second liquid pumping compartments on opposite sides of said first piston, 1. each of said release valves spring loaded into closed position but operable to open under the application of liquid pressure, 2. both of said liquid release valves connecting with a common liquid outlet port, F. a liquid intake chamber having means for connection thereof to a reservoir of liquid, G. first and second liquid check valves connected with said liquid intake chamber, 1. said first check valve mounted in said first piston and connecting said intake chamber with said first compartment of said liquid pumping chamber, and 2. said second check valve connecting said intake chamber with said second compartment of said liquid pumping chamber, whereby upon movement of said first piston in a direction to decrease the volume of said first liquid compartment and increase the volume of said second liquid compartment said second check valve opens to admit liquid from said intake chamber into said second compartment, and upon motion of said first piston in the opposite direction said first check valve opens to admit liquid from said intake chamber into said first compartment.
Claim 2
Dependent Claim
342 words
A double acting liquid fuel pump of the reciprocating piston type comprising in combination: A. a liquid pumping chamber comprising first and second sealed compartments separated by a first piston slidably movable therebetween, B. A vacuum chamber comprising first and second hermetically sealed compartments separated by a second piston movable therebetween, C. a linearly reciprocable piston shaft common to said first and second pistons, and having one end thereof extending through a wall of said first sealed vacuum compartment, D. first valve means connected to and operable by said extending piston shaft end, and movable between first and second operating positions, 1. means on said valve for connection thereof to a vacuum line, 2. means connecting said valve when in a first position to said first vacuum compartment, 3. further means connecting said valve in its second position to said second vacuum compartment, E. first and second liquid release valves in said first and second liquid pumping compartments on opposite sides of said first piston, 1. each of said release valves spring loaded into closed position but operable to open under the application of liquid pressure, 2. both of said liquid release valves connecting with a common liquid outlet port, F. a liquid intake chamber having means for connection thereof to a reservoir of liquid, G. first and second liquid check valves connected with said liquid intake chamber, 1. said first check valve mounted in said first piston and connecting said intake chamber with said first compartment of said liquid pumping chamber, and 2. said second check valve connecting said intake chamber with said second compartment of said liquid pumping chamber, whereby upon movement of said first piston in a direction to decrease the volume of said first liquid compartment and increase the volume of said second liquid compartment said second check valve opens to admit liquid from said intake chamber into said second compartment, and upon motion of said first piston in the opposite direction said first check valve opens to admit liquid from said intake chamber into said first compartment.
Claim 3
Dependent Claim
14 words
means connecting said valve when in a first position to said first vacuum compartment,
Claim 4
Dependent Claim
14 words
means connecting said valve when in a first position to said first vacuum compartment,
Claim 5
Dependent Claim
14 words
means connecting said valve when in a first position to said first gas compartment,
Claim 6
Dependent Claim
14 words
means connecting said valve when in a first position to said first gas compartment,
Claim 7
Dependent Claim
41 words
both of said liquid release valves connecting with a common liquid outlet port, F. a liquid intake chamber having means for connection thereof to a reservoir of liquid, G. first and second liquid check valves connected with said liquid intake chamber,
Claim 8
Dependent Claim
41 words
both of said liquid release valves connecting with a common liquid outlet port, F. a liquid intake chamber having means for connection thereof to a reservoir of liquid, G. first and second liquid check valves connected with said liquid intake chamber,
Claim 9
Dependent Claim
88 words
said second check valve connecting said intake chamber with said second compartment of said liquid pumping chamber, whereby upon movement of said first piston in a direction to decrease the volume of said first liquid compartment and increase the volume of said second liquid compartment said second check valve opens to admit liquid from said intake chamber into said second compartment, and upon motion of said first piston in the opposite direction said first check valve opens to admit liquid from said intake chamber into said first compartment.
Claim 10
Dependent Claim
88 words
said second check valve connecting said intake chamber with said second compartment of said liquid pumping chamber, whereby upon movement of said first piston in a direction to decrease the volume of said first liquid compartment and increase the volume of said second liquid compartment said second check valve opens to admit liquid from said intake chamber into said second compartment, and upon motion of said first piston in the opposite direction said first check valve opens to admit liquid from said intake chamber into said first compartment.
Claim 11
Dependent Claim
23 words
The combination of claim 1 wherein said second piston comprises a flexible diaphragm centrally mounted between symmetrically opposed walls of said vacuum chamber.
Claim 12
Dependent Claim
33 words
a first liquid entrance valve on said second piston normally open when said piston is moved in a first direction and closed when said piston is moved in a second and opposite direction,
Claim 13
Dependent Claim
33 words
a first liquid entrance valve on said second piston normally open when said piston is moved in a first direction and closed when said piston is moved in a second and opposite direction,
Claim 14
Dependent Claim
41 words
both of said liquid release valves connecting with a common liquid outlet port; F. a liquid intake chamber having means for connection thereof to a reservoir of liquid; G. first and second liquid check valves connected with said liquid intake chamber,
Claim 15
Dependent Claim
41 words
both of said liquid release valves connecting with a common liquid outlet port; F. a liquid intake chamber having means for connection thereof to a reservoir of liquid; G. first and second liquid check valves connected with said liquid intake chamber,
Claim 16
Dependent Claim
85 words
said second check valve connecting said intake chamber with said second liquid compartment, whereby, upon movement of said first piston in a direction to decrease the volume of said first liquid compartment and increase the volume of said second liquid compartment, said second check valve opens to admit liquid from said intake chamber into said second compartment, and upon motion of said first piston in the opposite direction said first check valve means opens to admit liquid from said intake chamber into said first compartment.
Claim 17
Dependent Claim
85 words
said second check valve connecting said intake chamber with said second liquid compartment, whereby, upon movement of said first piston in a direction to decrease the volume of said first liquid compartment and increase the volume of said second liquid compartment, said second check valve opens to admit liquid from said intake chamber into said second compartment, and upon motion of said first piston in the opposite direction said first check valve means opens to admit liquid from said intake chamber into said first compartment.
Claim 18
Dependent Claim
50 words
a second liquid entrance valve on said second liquid chamber wall normally closed when said piston is moved in said first direction and opened when said piston is moved in said second direction, a. said second liquid entrance valve connecting said first and second compartments of said liquid pumping chamber,
Claim 19
Dependent Claim
50 words
a second liquid entrance valve on said second liquid chamber wall normally closed when said piston is moved in said first direction and opened when said piston is moved in said second direction, a. said second liquid entrance valve connecting said first and second compartments of said liquid pumping chamber,
Claim 20
Dependent Claim
28 words
The combination of claim 1 wherein said first valve means comprises a toggle valve connected by a flexible linkage to the extending end of said reciprocable piston shaft.
Claim 21
Dependent Claim
14 words
further means connecting said valve in its second position to said second gas compartment,
Claim 22
Dependent Claim
14 words
further means connecting said valve in its second position to said second gas compartment,
Claim 23
Dependent Claim
36 words
further means connecting said valve in its second position to said second vacuum compartment, E. first and second liquid release valves in said first and second liquid pumping compartments on opposite sides of said first piston,
Claim 24
Dependent Claim
36 words
further means connecting said valve in its second position to said second vacuum compartment, E. first and second liquid release valves in said first and second liquid pumping compartments on opposite sides of said first piston,
Claim 25
Dependent Claim
33 words
push rod means remote and separate from said piston shaft connecting said second piston to said valve; E. first and second liquid release valves respectively in said first and second liquid pumping compartments,
Claim 26
Dependent Claim
33 words
push rod means remote and separate from said piston shaft connecting said second piston to said valve; E. first and second liquid release valves respectively in said first and second liquid pumping compartments,
Claim 27
Dependent Claim
26 words
The combination of claim 3 wherein said toggle valve vacuum connecting means includes a flexible hose connectable to the vacuum line of an internal combustion engine.
Claim 28
Dependent Claim
110 words
first and second liquid exit valves in said liquid pumping chamber on opposite sides of said second piston, a. said first exit valve normally closed and said second exit valve normally open when said piston is moved in said first direction b. said first exit valve normally open and said second exit valve normally closed when said piston is moved in said second direction, c. a common passageway in said pump connecting both said first and second liquid exit valves with a single exit port, and E. an entrance port of said pump connected with said second compartment of said pumping chamber and adapted for connection to a liquid reservoir.
Claim 29
Dependent Claim
110 words
first and second liquid exit valves in said liquid pumping chamber on opposite sides of said second piston, a. said first exit valve normally closed and said second exit valve normally open when said piston is moved in said first direction b. said first exit valve normally open and said second exit valve normally closed when said piston is moved in said second direction, c. a common passageway in said pump connecting both said first and second liquid exit valves with a single exit port, and E. an entrance port of said pump connected with said second compartment of said pumping chamber and adapted for connection to a liquid reservoir.
Claim 30
Dependent Claim
21 words
A vacuum powered liquid pump comprising in combination A. a hermetically sealed vacuum chamber having a pair of symmetrically opposed walls,
Claim 31
Dependent Claim
21 words
A vacuum powered liquid pump comprising in combination A. a hermetically sealed vacuum chamber having a pair of symmetrically opposed walls,
Claim 32
Dependent Claim
47 words
The combination of claim 5 wherein said first valve means comprises a toggle valve having first, second and third ports, and said toggle valve is movable by said reciprocating piston shaft between first and second positions alternately connecting said third port to said first and second ports.
Claim 33
Dependent Claim
68 words
The combination of claim 5 wherein said reservoir connecting means comprises an internally and externally threaded nipple portion, the internally threaded portion being adapted to receive a threaded pipe end and the externally threaded portion being adapted to screw into a threaded oil drum bung hole, and a flat surface formed on said external threaded portion to provide an air vent to said drum through said bung hole.
Claim 34
Dependent Claim
82 words
A double acting liquid fuel pump of the reciprocating piston type comprising: A. a liquid pumping chamber comprising first and second sealed liquid compartments separated by a first piston slidably movable therebetween; B. a gas motor chamber comprising first and second hermetically sealed gas compartments separated by a second piston movable therebetween; C. a linearly reciprocable piston shaft common to said first and second pistons; D. first valve means operable by said second piston and movable between first and second operating positions,
Claim 35
Dependent Claim
82 words
A double acting liquid fuel pump of the reciprocating piston type comprising: A. a liquid pumping chamber comprising first and second sealed liquid compartments separated by a first piston slidably movable therebetween; B. a gas motor chamber comprising first and second hermetically sealed gas compartments separated by a second piston movable therebetween; C. a linearly reciprocable piston shaft common to said first and second pistons; D. first valve means operable by said second piston and movable between first and second operating positions,
Claim 36
Dependent Claim
23 words
The pump of claim 8 wherein said second piston comprises a flexible diaphragm centrally mounted between symmetrically opposed walls of said gas chamber.
Claim 37
Dependent Claim
23 words
The pump of claim 9 wherein said first valve means comprises a toggle valve connected by a push rod to said flexible diaphragm.
Claim 38
Dependent Claim
38 words
The pump of claim 10 wherein said toggle valve has first, second, and third ports and is movable by said push rod between first and second positions alternately connecting said third port to said first and second ports.
Claim 39
Dependent Claim
27 words
The pump of claim 8 wherein the means for connecting said first valve to a gas line comprises a pressure regulator connectable to a compressed air source.
Claim 40
Dependent Claim
34 words
The pump of claim 12 wherein said pressure regulator comprises: an enclosure surrounding said valve; an inlet check valve in said enclosure; and means for resiliently loading said check valve toward its closed position.
Claim 41
Dependent Claim
50 words
The pump of claim 13 wherein said loading means comprises: a cantilevered spring within said enclosure; a diaphragm secured to the unsupported end of said spring and mounted in an opening defined by said enclosure; and a closure member for said check valve supported by said spring intermediate its ends.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |