|Publication number||US2503743 A|
|Publication date||Apr 11, 1950|
|Filing date||Jan 12, 1948|
|Priority date||Jan 12, 1948|
|Publication number||US 2503743 A, US 2503743A, US-A-2503743, US2503743 A, US2503743A|
|Inventors||Keefer Walter L|
|Original Assignee||Pangborn Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Referenced by (20), Classifications (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
April 11, 1950 w. L. KEI-:FER
NOZZLE SKIRT FOR BLAST GUNS Filed Jan. 12, 1948 NN p w z w mw ww Patented Apr. ll, 1950 NOZZLE SKIRT FOR BLAST Walter L.' Kaefer, Hagerstown, Md., assignor' to Pangborn Corporation, Hagerstown, Md., afeorporation of MarylandA f Application Jaliiiary 12, i948,A serial No.' 1,88
' 7 claims. (01.51-11) 1- This inventionlrelates tor abrading equipment, and is more particularly concerned with guns fused to' project at high velocity a stream ofliquid and abrasive material, such as water and sand.
Guns of this type usually comprise a jet disposed in a chamber for delivering a stream oi liquid at high velocity into a nozzle, andV means vfor communicating the chamber with a source of abrasive material whereby both the liquid and the abrasive material are mixed together in the chamber and forced out through the nozzle. One of the diiculties heretofore encountered is the `4factvthat the mixture streaming from the nozzle outlet at high velocity has a tendency to expand and lose density thereby decreasing the eiciency of the gun and the accuracy with which the projecting stream may be utilized in various types of abrading work.
It is an object of the present invention to reverse this undesirable tendency and thereby to maintain the streaming mixture in a concentrated form'.
Other objects and advantages of this invention will be apparent from the following description considered together with the accompanying drawing, in which drawing:
Fig. 1 is a section through the longitudinal axis of a blast gun of the type mentioned showing an embodiment of my invention disposed thereon.
Fig. 2 is a section along the line 2-2 of Fig. l.
Fig. 3 is an enlarged longitudinal section of a portion of the embodiment of my invention shown in Fig. 1.
Referring with more particularity to the drawing in which like numerals designate like parts, the embodiment illustrated comprises an elongated tubular 'member or skirt II, the front or discharge end I2 being an elongated conduit through which a stream I3 of liquid and abrasive material is projected. The rear or nozzle end I4 is larger than the outlet end of -vthe nozzle I5 of the gun. The inner Wall of the nozzle end I4 is provided with a group of inwardly projecting ns or ribs I6. These iins are secured to or integral with the nozzle end I 4, and their inner edges I7 comprise radially facing shoulders to t snugly about the outlet end of the nozzle I5. Shoulders it are also provided within nozzle end I4 to engage'the nozzle tip I9 when the latter is properly inserted in the nozzle end I4, thereby making it easy to dispose the skirt on the nozzle in the proper relative position. The nozzle and skirt .are heldtogether in this relationship by means of a set screw disposed through the wall of the skirt to"releasably engage the nozzle I5,
'GUN'SQ n A .-,2- .11; substantially as shown. However, other ineens may be employed 'for-'securing these twomeinbers in position. AThe spaces between the fins I6 are open to' the surrounding atmosphere through openings 2 i? and they also 'cornmunic'zate withth'e bore 22 of the dischargeend i2'throughpen ings I The bore 22 has a' gradualltaper from its rear to its forward tip 24, Where the diameter is greater than that of the nozzle outlet 25. This isa very important featureof the? invention, as will be explained hereinafter-.i `In operation, 'eL-jety 26.-*d1spo'sedf-in' fa :chamber 21 projects at high velocity a stream of liquid under pressure, such as water 28, from a source (not shown) through the pipe 29 into the nozzle l5. An abrasive, such as wet sand 30, is led into the chamber 21 through a pipe 3|. The effect of the projection of the liquid from the jet 26 at high velocity is to create a partial vacuum in the chamber 21, which, in turn, draws the abrasive material into the chamber where it is mixed with the liquid and projected through the nozzle I5. Ordinarily, the stream I3 of mixed liquid and abrasive projecting from the nozzle expands and rapidly loses density. The invention reverses this tendency. As the stream I3 passes through the bore 22, it induces a flow oi air from the atmosphere through the channels between the fins I 6. The indrawn air passes through the bore 22 and is trapped between its wall and the stream I3 passing therethrough. Since the cross-sectional area of the bore decreases toward its tip but is always greater than the nozzle outlet, the trapped air becomes more and more compressed. The pressure created by this compression tends to maintain the liquid and abrasive stream in a concentrated state.
l. A skirt for the nozzle of a high velocity blast gun comprising a tubular member having one end adapted to be disposed over the outlet end of the nozzle in radially spaced relation, means for securing the skirt on the nozzle, the other end of the skirt being elongated and having a bore 'tapering gradually away from the nozzle end to a diameter greater than that of the nozzle outlet.
2. A skirt for the nozzle of a high velocity blast gun, said skirt having a nozzle end and a discharge end, said nozzle end being adapted to be disposed oye'rithe outlet end of the nozzle in radially spacedrelation, means for securing the lskirt and nozzle insaid relation, the discharge end of the A'skirt being elongated and having a A skirt for the nozzle of a high velocity blast gun,`said skirt `having vra nozzle end `and a'V discharge end, saidnozzle'end being adapted to bje disposed over the-.nozzle llongitudinal ilns Withinthe nozzle "end, the Vinner edges thereof being adapted to ngage' the nozzle, means for securing` the skirt onth'e nozzle against relative 1 movement, the discharge'end-of the skirt being elongated and havingla b ore gradually tapering to the outlet thereof to'adiameter greater` than that of the nozzle outlet. k 5. A skirt as de ned'by claim 4 having shoulders within the nozzle end to abut the nozzle of .the gun when the nozzle and skirt are in a predetermined relative position.
6. A high velocity blast gun nozzle in combination With a skirt having a nozzle end and a discharge end, said nozzle end being secured on the nozzle of the gun in radially spaced relation, the discharge end ofthe `skirt beingl elongated and `having a bore gradually tapering to the outlet 4 thereof to a diameter greater than that of the nozzle outlet.
7. The combination of a blast gun nozzle for projecting at high Velocity a stream of liquid and abrasive material and a skirt therefor, said skirt having its inlet end disposed on the nozzle, the outlet end of the skirt having a bore gradually tapering to the outlet thereof to a diameter greater than that of the nozzle outlet, said inlet end having air admission passages therethrough communicating said bore freely with the ambient atmosphere, and providing for induction therethrough, by passage of the liquid stream through said bore, of atmospheric air to sheath the stream within the bore, the Walls of said tapering bore being positioned throughout their extent to be in spaced relation to the liquid stream as conned by the sheath of induced air squeezed down between said stream and bore.
WALTER L. KEEFER.
REFERENCES CITED The following references are of record in the le 0f this :patent:
l UNITED STATES PATENTS Number Germany Dec. 20, 1913
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|Citing Patent||Filing date||Publication date||Applicant||Title|
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|U.S. Classification||451/102, 239/428|
|International Classification||B24C5/04, B24C5/00|