US3880355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air blow gun
Assignee: Graco Inc
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Filing: 1974-04-08
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Granted: 1975-04-29
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Expires: 1994-04-08
Abstract
Abstract Apparatus is described for controllably directing a stream of pressurized air, as for use in cleaning or dusting a work area or machine part. The apparatus is gun-shaped and has an air valve trigger, and internal construction for reducing the air pressure and operating noise level, including an input orifice restriction, a valve and relief chamber, and an output construction having a nozzle and passages related thereto for providing a safety air curtain.
Inventors
- 👤 James H Larson
- 👤 William D Vork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:15
CPC Classifications
B; B08; B08B; B08B5/00; B08B5/02; B05; B05B; B05B1/00; B05B1/005
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
171 words
An apparatus for controllably directing a stream of pressurized air by actuation of an internal air valve, comprising: a. an inlet passage adapted for connection to the source of pressurized air; b. an orifice passage of cross sectional area 1/25th to 1/50th of said inlet passage, communicating with the interior end of said inlet passage and having a length of at least 3 times its diameter; c. a valve chamber communicating with said orifice passage, said valve chamber housing said internal air valve; d. an outlet nozzle having a nozzle passage for directing said air stream and having means for connecting said passage to said valve chamber, the volume of said nozzle passage being substantially equal to the volume of said valve chamber; e. a plurality of air shield passages circumferentially arranged around said nozzle passage and radially and forwardly outwardly inclined from said nozzle passage axis, said shield passages communicating between said internal air stream and the exterior of the apparatus; and f. means for activating said internal air valve.
Claim 2
Independent Claim
171 words
An apparatus for controllably directing a stream of pressurized air by actuation of an internal air valve, comprising: a. an inlet passage adapted for connection to the source of pressurized air; b. an orifice passage of cross sectional area 1/25th to 1/50th of said inlet passage, communicating with the interior end of said inlet passage and having a length of at least 3 times its diameter; c. a valve chamber communicating with said orifice passage, said valve chamber housing said internal air valve; d. an outlet nozzle having a nozzle passage for directing said air stream and having means for connecting said passage to said valve chamber, the volume of said nozzle passage being substantially equal to the volume of said valve chamber; e. a plurality of air shield passages circumferentially arranged around said nozzle passage and radially and forwardly outwardly inclined from said nozzle passage axis, said shield passages communicating between said internal air stream and the exterior of the apparatus; and f. means for activating said internal air valve.
Claim 3
Dependent Claim
28 words
Apparatus as claimed in claim 1, further comprising means for structurally protecting said nozzle passages and air shield passages, said means being axially aligned with said nozzle passage.
Claim 4
Dependent Claim
32 words
The apparatus of claim 2 wherein said means for structurally protecting further comprises at least two shoulders extending forwardly to a region substantially adjacent the exterior outlets of said air shield passages.
Claim 5
Dependent Claim
25 words
The apparatus of claim 3, wherein said nozzle passage is formed within a removable nozzle, and said removable nozzle is threadably attached to said apparatus.
Claim 6
Dependent Claim
15 words
The apparatus of claim 4 wherein the number of said air shield passages is six.
Claim 7
Dependent Claim
26 words
The apparatus of claim 5, wherein the angle of inclination of said air shield passages relative to the axis of said nozzle passage is substantially 30*.
Claim 8
Dependent Claim
33 words
The apparatus of claim 1 wherein the means for activating said internal air valve further comprises a rod attached to said valve and slideably and sealably extending to the exterior of said apparatus.
Claim 9
Dependent Claim
168 words
An air blow gun apparatus having a trigger-actuated internal air valve for directing pressurized air, comprising: a. an inlet passage adapted for connection to a source of pressurized air; b. an internal valve chamber for housing said air valve; c. an orifice passage of lesser diameter than said inlet passage and of length at least 3 times its diameter, communicating between said inlet passage and said valve chamber; d. an outlet passage communicating with said valve chamber, said outlet passage having an internal volume substantially equal to the internal volume of said valve chamber; e. a nozzle passage connected to said outlet passage and extending exterior of the gun; and f. a plurality of shield passages connected between the outlet passage and gun exterior, said shield passages being symmetrically aligned about the axis of said nozzle passage and inclined radially and forwardly away from said nozzle passage, the total cross sectional area of said shield passages being substantially equal to the cross sectional area of said nozzle passage.
Claim 10
Dependent Claim
168 words
An air blow gun apparatus having a trigger-actuated internal air valve for directing pressurized air, comprising: a. an inlet passage adapted for connection to a source of pressurized air; b. an internal valve chamber for housing said air valve; c. an orifice passage of lesser diameter than said inlet passage and of length at least 3 times its diameter, communicating between said inlet passage and said valve chamber; d. an outlet passage communicating with said valve chamber, said outlet passage having an internal volume substantially equal to the internal volume of said valve chamber; e. a nozzle passage connected to said outlet passage and extending exterior of the gun; and f. a plurality of shield passages connected between the outlet passage and gun exterior, said shield passages being symmetrically aligned about the axis of said nozzle passage and inclined radially and forwardly away from said nozzle passage, the total cross sectional area of said shield passages being substantially equal to the cross sectional area of said nozzle passage.
Claim 11
Dependent Claim
28 words
An apparatus as claimed in claim 8, further comprising means for structurally protecting said nozzle passages and shield passages, said means being axially aligned with said nozzle passage.
Claim 12
Dependent Claim
32 words
The apparatus of claim 9 wherein said means for structurally protecting further comprises at least two shoulders extending forwardly to a region substantially adjacent the exterior outlets of said air shield passages.
Claim 13
Dependent Claim
25 words
The apparatus of claim 10, wherein said nozzle passage is formed within a removable nozzle, and said removable nozzle is threadably attached to said apparatus.
Claim 14
Dependent Claim
32 words
The apparatus as claimed in claim 11 wherein the angle of inclination of said shield passages is substantially 30* relative to said nozzle passage, and the number of shield passages is six.
Claim 15
Dependent Claim
22 words
The apparatus of claim 12 wherein the area of said orifice passage is 1/25th to 1/50th the area of said inlet passage.
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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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |