Patent US3786990A successfully refreshed from Google Patents.
US3786990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural component gun
Assignee: Graco Inc
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Filing: 1972-07-17
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Granted: 1974-01-22
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Expires: 1992-07-17
Abstract
Abstract An improved internal mix plural component spray gun. This gun is of the solventless type that has as its major method of purging the barrel bore that acts as a mixing chamber, a movable valve rod. The rod may have a spray pattern and mixing device on its front end. A lubricating device for the rod may be added to this specific rod feature in combination or may be used by itself for any rod. The front end of the rod is rotated near the chemicallyreactive plural component inlets to the mixing chamber to adjust the degree of change for the spray pattern and/or component mixing. Specially designed flatten deflecting rod surfaces accomplish this result. The rod may be made to reciprocate in its barrel bore to purge the mixed components and control the flow from the component inlets. This movement is aided by a lubricant supplied to the rod usually rearward of the component inlets. Such a lubricant substantially eliminates sticking of the movable rod in any of its positions and also acts to keep the rod clean. Fluid jets near the barrel front outlet also aid in cleaning the front end of the rod and preventing the mixed reactive plural components from fully reacting while on the valve rod. The lubricant may be gravity-fed or force-fed from a pressurized fluid source. If a pressurized fluid source is used, the same fluid may be used to simultaneously act as the mentioned rodcleaning jets by actuating a single trigger valve.
Inventors
- 👤 G Hagfors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:11
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/24; B05B7/2402; B05B7/2478; B05B12/00; B05B12/002; B05B12/0022; B05B12/0024; B05B12/0026; B05B7/02; B05B7/12; B05B7/1254; B05B7/1263; B05B7/1272; B05B7/1281; B05B7/2405; B05B7/2435; B05B7/2437
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A plural component gun comprising: a barrel having a bore extending therethrough with the front end of the barrel bore constituting a liquid outlet; a plurality of spaced inlets into said bore for introducing different liquids thereto to mix said liquids; an elongated rod slideably mounted in said bore, said rod having a major portion with a complementary shaped cross-sectional dimension as compared to said internal bore shape along substantially its entire length when mounted in the bore, said rod also having a front end portion; and the front end portion of said rod having at least two substantially flatten surfaces with their greatest cross-sectional dimension being uniform throughout the length of the front end and equal to or less than that of the cross-sectional dimension of the major portion of the rod.
Claim 2
Dependent Claim
133 words
A plural component gun comprising: a barrel having a bore extending therethrough with the front end of the barrel bore constituting a liquid outlet; a plurality of spaced inlets into said bore for introducing different liquids thereto to mix said liquids; an elongated rod slideably mounted in said bore, said rod having a major portion with a complementary shaped cross-sectional dimension as compared to said internal bore shape along substantially its entire length when mounted in the bore, said rod also having a front end portion; and the front end portion of said rod having at least two substantially flatten surfaces with their greatest cross-sectional dimension being uniform throughout the length of the front end and equal to or less than that of the cross-sectional dimension of the major portion of the rod.
Claim 3
Dependent Claim
23 words
The gun of claim 1 wherein said front end of the rod also has a shorter cross-sectional dimension between the two flatten surfaces.
Claim 4
Dependent Claim
36 words
The gun of claim 2 wherein said flatten surfaces of the rod front end portion are two oppositely-directed parallel flatten surfaces that can be rotatably aligned with said liquid inlets to deflect different liquids emitted therefrom.
Claim 5
Dependent Claim
24 words
The gun of claim 1 including means for supplying a lubricant to said rod rearwardly from said liquid outlet and spaced liquid bore inlets.
Claim 6
Dependent Claim
27 words
The gun of claim 1 wherein said bore has substantially the same uniform diameter throughout its length, and said bore inlets comprise at least two oppositely-directed inlets.
Claim 7
Dependent Claim
21 words
The gun of claim 1 including means for rotating said rod front end portion with respect to said spaced liquid inlets.
Claim 8
Dependent Claim
24 words
The gun of claim 1 including means for rotating said rod in the bore and additional means for reciprocating said rod in the bore.
Claim 9
Dependent Claim
38 words
The gun of claim 1 including means for supplying a liquid lubricant to said rod rearward of said bore liquid inlets including a pressurized liquid lubricant reservoir connected to said gun to force lubricant on to said rod.
Claim 10
Dependent Claim
161 words
A plural component spray gun comprising: a barrel assembly having a barrel with a bore extending through said barrel, the front end of said barrel constituting a liquid outlet; at least two spaced inlets into said bore for introducing different liquids thereto to mix said liquids; an elongated rod slidably mounted in said bore with said rod having a complementary shaped uniform cross-sectional dimension as compared to the cross-sectional dimension of said bore along substantially its entire length; a lubricant reservoir connected to said barrel assembly, and a coNduit to supply the lubricant from the lubricant reservoir to the rod at a section spaced rearward of the liquid inlets; means connected to said lubricant reservoir for controllably applying a source of pressurized air to force the lubricant from said reservoir to said rod; means for supplying a source of pressurized air to said liquid outlet to clean the front portion of said elongated rod when it protrudes through said liquid outlet.
Claim 11
Dependent Claim
161 words
A plural component spray gun comprising: a barrel assembly having a barrel with a bore extending through said barrel, the front end of said barrel constituting a liquid outlet; at least two spaced inlets into said bore for introducing different liquids thereto to mix said liquids; an elongated rod slidably mounted in said bore with said rod having a complementary shaped uniform cross-sectional dimension as compared to the cross-sectional dimension of said bore along substantially its entire length; a lubricant reservoir connected to said barrel assembly, and a coNduit to supply the lubricant from the lubricant reservoir to the rod at a section spaced rearward of the liquid inlets; means connected to said lubricant reservoir for controllably applying a source of pressurized air to force the lubricant from said reservoir to said rod; means for supplying a source of pressurized air to said liquid outlet to clean the front portion of said elongated rod when it protrudes through said liquid outlet.
Claim 12
Dependent Claim
31 words
The gun of claim 9 further comprising valve means for simultaneously allowing the applying of pressurized air to said lubricant reservoir and the supplying of pressurized air to said liquid outlet.
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |