US3690557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic foam spray gun with substantially instantaneous cleaning feature
Assignee: Individual
•
Filing: 1971-07-29
•
Granted: 1972-09-12
•
Expires: 1991-07-29
Abstract
Abstract A plastic foam forming and spraying system which utilizes a spray gun that mixes resins and a catalyst in a mixing chamber substantially at the discharge end thereof. Provision is made for instantly cleaning the gun of the catalyst and resin mixture by passing a solvent therethrough to clean the mixture from the interior passages of the gun, and clean the outlet passages thereof by directing air and a solvent, under pressure, therethrough. A special valving arrangement enables the valves to direct a solvent into the passages without permitting the fluid to come into contact with the threads.
Inventors
- 👤 James H Higgins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:27
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/74; B29B7/7438; B05; B05B; B05B15/00; B05B15/50; B05B15/55
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
70 words
A spray gun for converting a plurality of fluids into an expanded foam, as defined in claim 1; wherein a. said mixing chamber extends spirally within said spray head, b. a discharge nozzle is mounted on said spray head, and c. said discharge nozzle has an axial opening formed therein, which opening is in fluid communication with said chamber in said spray head, when said sliding valve member is open.
Claim 2
Dependent Claim
16 words
conduits connected with said respective passages for directing fluids, under pressure, into and through, said body,
Claim 3
Dependent Claim
24 words
said valve member closing the discharge opening in said spray head, when in one position, to keep said first mentioned fluids from passing therethrough,
Claim 4
Dependent Claim
15 words
a spray head connected to said body, which spray head has a passage formed therethrough,
Claim 5
Dependent Claim
65 words
said sliding valve member being movable longitudinally to permit said first mentioned fluids to escape from said mixing chamber, and d. a tube connected to said sliding valve member in axial relation, and being slidable therewith, for directing a further fluid therethrough and through the axial opening of said sliding valve member to simultaneously mix with said first mentioned fluids to form an expanded foam.
Claim 6
Dependent Claim
33 words
A spray gun for converting a plurality of fluids into an expanded foam, as defined in claim 1; wherein a. said valve member is mounted within said spray head for longitudinal movement therein,
Claim 7
Dependent Claim
116 words
A spray gun for converting a plurality of fluids into an expanded foam, as defined in claim 1; wherein a. said spray head has a first annular chamber formed therein, which is said mixing chamber, which chamber is in fluid communication with said converging passages in said body, b. said spray head having a spiral chamber formed therein, which spiral chamber is in fluid communication with said annular chamber, c. said spray head having a second annular chamber formed therein, which second annular chamber is in fluid communication with said spiral chamber, and d. the discharge opening in said spray head being in fluid communication with said annular chamber when said sliding valve member is open.
Claim 8
Dependent Claim
16 words
said passage in said spray head being in fluid communication with said passages in said body,
Claim 9
Dependent Claim
9 words
said spray head having a mixing chamber formed therein,
Claim 10
Dependent Claim
105 words
A spray gun for converting a plurality of fluids into an expanded foam, as defined in claim 1; wherein a. a further of said passages within said body is interconnected with said first two mentioned passages, b. a conduit connected to said further passage in fluid communication, through which conduit a solvent is directed, under pressure, into said further passage, and c. valve means within said passage to selectively control the flow of solvent into and through said first two mentioned passages and through said spray head for cleaning said passages and for cleaning the chambers of said spray head and the discharge opening thereof.
Claim 11
Dependent Claim
45 words
A spray gun for converting a plurality of fluids into an expanded foam, as defined in claim 5; wherein a. said valve means includes two valves in axial alignment, which pass through the respective first two mentioned passages and seat in said further passage, and
Claim 12
Dependent Claim
58 words
said spray head having a discharge opening formed therein, which opening is in fluid communication with the passage in said spray head, b. two of said passages in said body converging into said mixing chamber in said spray head to direct two fluids thereinto for intimate mixing thereof, c. a valve member slidably mounted in said spray head,
Claim 13
Dependent Claim
45 words
A spray gun for converting a plurality of fluids into an expanded foam, as defined in claim 5; wherein a. check valve means is positioned in each said two first mentioned passages to direct the flow of fluid in said passages in one direction only.
Claim 14
Dependent Claim
121 words
A spray gun for converting a plurality of fluids into an expanded foam, as defined in claim 3; wherein a. a handle is mounted on said spray gun, b. a flexible conduit is connected in fluid communication with said tube on which said sliding valve member is mounted, which tube extends longitudinally of said body, and c. a trigger pivotally connected to said tube And to said body and being mounted a spaced distance forward of said handle for manual operation so said trigger will move said tube and said sliding valve member longitudinally of said spray head to control the discharge of foam from the discharge opening of said spray head while said trigger and said handle are manually operated.
Claim 15
Dependent Claim
65 words
A spray gun for converting a plurality of fluids into an expanded foam, as defined in claim 8; wherein a. a spring surrounds said tube and is interposed in abutting relation between said handle and said trigger to move said tube longitudinally to seat said sliding valve member on said valve seat in said spray head, when said sliding valve member is in one position.
References Cited (Backward Citations)
US476177A
Cited
US1315765A
Cited
US629338A
Cited
US1044104A
Cited
US1434238A
Cited
US1667365A
Cited
AT125174B
Cited
DE593246C
Cited
US2362213A
Cited
US2351372A
Cited
GB566543A
Cited
DK90638C
Cited
US2984421A
Cited
US3249304A
Cited
AT259728B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |