Patent US2800299A successfully refreshed from Google Patents.
Patent US3837575A successfully refreshed from Google Patents.
US3837575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray gun
Assignee: Pharmacia and Upjohn Co
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Filing: 1973-08-27
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Granted: 1974-09-24
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Expires: 1993-08-27
Abstract
Abstract A spray gun is disclosed for use in admixing and spraying, as a homogeneous mixture, two or more chemically reactive fluid components, more especially catalyzed polymerizable resin coating materials such as polyurethanes, epoxides, polyesters and other thermosets, either of the self-foaming or film-forming type. Because of the high rate of reactivity of the fluid components involved, the gun is designed to restrict actual admixture of them to a relatively small region within the gun body located immediately upstream of the spray discharge orifice so that application to the surface occurs as promptly as practical after admixture. Flow rate control and check valve means are provided in the gun for the several fluid components; in addition a solvent flush system is also incorporated for purging the gun after use. The flow rate control valves are of special ball design, affording greater mechanical simplification and better sealing maintenance than conventional poppet or needle valves. The check valve means are likewise designed to facilitate gun maintenance by the provision of a unitized cartridge, design, making them easily removable from and replaceable in the gun body and giving easier and more complete access to the interior of the gun in connection with periodic major maintenance servicing of it.
Inventors
- 👤 A Lehnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:15
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/02; B05B7/12; B05B7/1209; B05B15/00; B05B15/50; B05B15/55; B05B7/04; B05B7/0408; B29; B29B; B29B7/00; B29B7/74; B29B7/7438
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
317 words
A spray gun for admixing reactive liquids and discharging the admixture as an atomized spray, which comprises a gun body and handle means therefor; a mixing chamber in said body and ducts formed in said body for separately receiving said reactive liquids from an external source and conducting them to said mixing chamber; a discharge orifice in said gun body which communicates said mixing chamber to atmosphere; a flow control valve chamber interposed in each of said ducts and forming at the points of intersection an inlet and an outlet in said flow control valve chamber, a variable position control valve disposed in each such chamber, each such control valve comprising: a. a ball member, a bore extending through said ball to form opposed ports, at the points of intersection with its surface, registerable with said inlet and outlet of said valve chamber; b. operating means for said ball; c. seating means for said ball, comprising a pair of annular seals, one each disposed about said duct inlet and outlet, and being disposed to embrace said ball surface in concentric alignment respectively with said opposed ports therein in the open position of said control valve; said gun including means interconnecting said ball operating means for simultaneous rotary displacement of said ball members to positions of respective non-alignment of said ports and annular seals; said gun body comprising a composite structure including a pair of complementary blocks, and means securing said blocks together in face-to-face relation wherein the abutting faces define a parting plane disposed substantially perpendicular to the axis of said discharge orifice, said plane intersecting each of said reactive liquid ducts in said body, one of said blocks carrying said handle means and being counter-bored in its aubtting face concentrIcally with said ducts to provide said control valve chambers; said discharge nozzle being mounted in the exposed end face of the other of said body blocks.
Claim 2
Dependent Claim
317 words
A spray gun for admixing reactive liquids and discharging the admixture as an atomized spray, which comprises a gun body and handle means therefor; a mixing chamber in said body and ducts formed in said body for separately receiving said reactive liquids from an external source and conducting them to said mixing chamber; a discharge orifice in said gun body which communicates said mixing chamber to atmosphere; a flow control valve chamber interposed in each of said ducts and forming at the points of intersection an inlet and an outlet in said flow control valve chamber, a variable position control valve disposed in each such chamber, each such control valve comprising: a. a ball member, a bore extending through said ball to form opposed ports, at the points of intersection with its surface, registerable with said inlet and outlet of said valve chamber; b. operating means for said ball; c. seating means for said ball, comprising a pair of annular seals, one each disposed about said duct inlet and outlet, and being disposed to embrace said ball surface in concentric alignment respectively with said opposed ports therein in the open position of said control valve; said gun including means interconnecting said ball operating means for simultaneous rotary displacement of said ball members to positions of respective non-alignment of said ports and annular seals; said gun body comprising a composite structure including a pair of complementary blocks, and means securing said blocks together in face-to-face relation wherein the abutting faces define a parting plane disposed substantially perpendicular to the axis of said discharge orifice, said plane intersecting each of said reactive liquid ducts in said body, one of said blocks carrying said handle means and being counter-bored in its aubtting face concentrIcally with said ducts to provide said control valve chambers; said discharge nozzle being mounted in the exposed end face of the other of said body blocks.
Claim 3
Dependent Claim
49 words
A spray gun as defined in claim 1, wherein lever means are provided for interconnecting said ball stems, said lever means comprising a hinged yoke forming an operating lever depending from said gun body generally coextensive with said handle, and means for biasing said lever away from said handle.
Claim 4
Dependent Claim
101 words
A spray gun as defined in claim 1, which further includes check valve means located in each said reactive liquid duct between said flow control valve and said discharge orifice, said other body block having sockets opening onto a lateral face and extending inwardly thereof generally parallel to said parting plane, each of said sockets respectively transversely intersecting a reactive liquid duct to form internal inlet and outlet means for said socket, said inlet and outlet being displaced axially along said socket, and means for removably retaining said check valve means in each said socket to close the open end thereof.
Claim 5
Dependent Claim
212 words
A spray gun as defined in claim 3, wherein said check valve means each comprises a cartridge type double-acting check valve assembly removably received as a unit in said socket, each such check valve assembly comprising: a. a hollow sleeve member open at its inner end and closed at its outer end; b. annular seals making fluid tight fit with the socket wall on either side of said socket outlet, and adjacent the outer end of said sleeve; c. ports formed in said sleeve member between each of two adjacent annular seals, a first of said ports communicating the interior of said sleeve member with said socket inlet and a second of said ports communicating the interior of said sleeve member with said socket outlet; d. a first check member positioned interiorily of said sleeve member intermediate said socket inlet and outlet and biased in a direction to prevent flow through said sleeve to said socket inlet, and a second check member positioned interiorily of said sleeve member intermediate said socket outlet and the inner end of said sleeve member and biased in a direction to prevent flow through said sleeve member to the inner end thereof, said first and second check members straddling said socket outlet and said second sleeve port.
Claim 6
Dependent Claim
49 words
A spray gun as defined in claim 4, which further includes flushing solvent ducting in said gun body for introducing solvent from an external source and conducting it to the inner ends of the respective check valve sleeve members, and a flow control valve located in said solvent ducting.
Claim 7
Dependent Claim
77 words
A spray gun as defined in claim 1, wherein said operating means for said ball comprises a non-circular socket let into the surface thereof, and projecting stem means in non-rotative engagement with said socket; said operating stems being disposed to project in spaced parallel relation to each other, and actuating means disposed between said projecting stems and operatively interconnecting them to effect rotation of said ball members; and remotely controlled piston means connected to said actuating means.
Claim 8
Dependent Claim
35 words
A spray gun as defined in claim 6, wherein said actuating means for said ball members comprise pinion gears on said stems and reciprocable rack means positioned between and in operative engagement with said pinions.
Claim 9
Dependent Claim
39 words
A spray gun as defined in claim 6, wherein said actuating means for said ball members comprises toggle means interconnecting the stems of said ball members and reciprocable plunger means having a lost motion connection to said toggle means.
Claim 10
Dependent Claim
337 words
A spray gun for admixing liquid components and discharging the admixture as an atomized spray, which comprises a gun body; a mixing chamber in said body and ducts formed in said body for separately receiving said liquid components from an external source and conducting them to said mixing chamber; a discharge orifice in said gun body which commmunicates said mixing chamber to atmosphere; blind bores let into said gun body from an exterior surface thereof to form check valve chambers, one each such bore intersecting each of said liquid component ducts to form an inlet and an outlet for said bore spaced axially therealong; a cartridge type double-acting check valve assembly removably received as a unit in each of said bores and closing the outer ends thereof, each such check valve assembly comprising: a. a hollow sleeve member open at its inner end and closed at its outer end; b. O-ring seals forming fluid tight fit between said bore on either side of said bore outlet and adjacent the outer end of said sleeve; c. ports formed in said sleeve member between each of two adjacent O-rings, a first of said ports communicating the interior of said sleeve member with said bore inlet and a second of said ports communicating the interior of said sleeve member with said bore outet; d. a first check member positioned interiorily of said sleeve member intermediate said bore inlet and outlet and biased in a direction to prevent flow through said sleeve to said bore inlet, and a second check member positioned interiorily of said sleeve member intermediate said bore outlet and the inner end of said sleeve member and biased in a direction to prevent flow through said sleeve member to the inner end thereof, said first and second check members straddling said bore outlet and said second sleeve bore; and solvent flush ducting formed in said gun body for introducing solvent from an external source and conducting it to the inner ends of said sleeve members in said bores.
Claim 11
Dependent Claim
337 words
A spray gun for admixing liquid components and discharging the admixture as an atomized spray, which comprises a gun body; a mixing chamber in said body and ducts formed in said body for separately receiving said liquid components from an external source and conducting them to said mixing chamber; a discharge orifice in said gun body which commmunicates said mixing chamber to atmosphere; blind bores let into said gun body from an exterior surface thereof to form check valve chambers, one each such bore intersecting each of said liquid component ducts to form an inlet and an outlet for said bore spaced axially therealong; a cartridge type double-acting check valve assembly removably received as a unit in each of said bores and closing the outer ends thereof, each such check valve assembly comprising: a. a hollow sleeve member open at its inner end and closed at its outer end; b. O-ring seals forming fluid tight fit between said bore on either side of said bore outlet and adjacent the outer end of said sleeve; c. ports formed in said sleeve member between each of two adjacent O-rings, a first of said ports communicating the interior of said sleeve member with said bore inlet and a second of said ports communicating the interior of said sleeve member with said bore outet; d. a first check member positioned interiorily of said sleeve member intermediate said bore inlet and outlet and biased in a direction to prevent flow through said sleeve to said bore inlet, and a second check member positioned interiorily of said sleeve member intermediate said bore outlet and the inner end of said sleeve member and biased in a direction to prevent flow through said sleeve member to the inner end thereof, said first and second check members straddling said bore outlet and said second sleeve bore; and solvent flush ducting formed in said gun body for introducing solvent from an external source and conducting it to the inner ends of said sleeve members in said bores.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |