US1757207A - Sand-blast nozzle - Google Patents

Description

s. B. NEIKIRK I 1,757,207

SAND BLAST NOZZLE Filed Nov. l8 1927 INVENJTOR.

ATTORNEY.

' to the accompanying} drawings in which a cutting action which very rapidly cuts away blast nozzle embodying my invention; and tive lifeof the nozzle. a

' 50 paratus in which a homogeneous mixture of taper n'-om the inner end to the discharge we Patented May 6,1935 7 i a I 1,757 207? SAMUEL NEIKIRK, or 1305:, Mrssonm sAnn-Brias'r NozzLE minimum filed November is, 19 27 Seria1 N d.234,132. 1

i This invention relates to apparatus for air. and sand forming theblast is conveyed sand blasting and particularly to the conthrough a host direct to the nozzle, the inner struction of a nozzle which will concentrate end of the nozzle is merely flared or provided thestream or jet of sand issuing from the with a short outward taper to meet the inner nozzle and project itwith greater force than walls ofthe hose in order to avoid any ledge those heretofore employed. V orcorner which would catch the sand. Such a One of the objects of my invention is to prior constructions are shown for instance in provide a nozzle which'will not be rapidly U.,S. Patents Nos. 561,483 and 979,897 or in worn away by the sand as it issues from the French patent, to Sloan No. 513,375 Febru- 10 month of the nozzle. Another object is'to ary 14:, 1921. In these prior devicesthe sand provide anozzle which will produce a strongwill clog just at the inner end of the flaring er blast than those nowin use with the same opening- 7 When this occurs the separated air pressure. l 7 sand seems to'hugthe inner walls of the bore In the followingdescription I shall refer of the nozzle and at the outlet end produces 7 Figure 1 is a diagrammatic illustration of an the metal and produces an irregular enapparatus employed in sand blasting; Figure larged discharge opening which greatly re- 2 is a longitudinal sectional view of a sand duces 1 the .efficiency and shortens the operazc Figure 3'is a longitudinal section of mynoz- The blast in nozzle remains substanzle illustrating the action of thesand in its tiallyhomogeneousthroughout and is gradpassage therethrough. r u'allyI converged in its passage through they As is well understood by those familiar f bore of the nozzle.- I have found by actual use with sand blasting, the sand is fed from a ofthese nozzles that there is no tendency to 2.", receptacle such as shown at IOinFig. 1,'which cut the metal at the outlet or discharge end is usually maintained under an air pressure; of the nozzle and hence that I haveovercome of about 7 pounds. The'nozzle 12 is secured 1 the very radical defect in the nozzles of said by a coupling 1 1 to a hose 15 connected to the prior construction. In addition to this, llOW- outlet of the sand receptacle. ever, I have greatly increased the efliciency 0 I have discovered that the defects above of theblast. The velocity of the blast is inmentioned may beovercome by providing the creased in its passage through the tapering inner end of the nozzle with an inlet chambore so 3 that the'cutting action of the blast ber 17 having an elongated conical wall eX- upon the work is increaseds everalfold. The tending to the line 18 in Figs. 2 and 3, which .force of the concentrated blast issuing from gradually concentrates the homogeneousrnix the nozzle permitstheworkman to hold the ture of air and sand without causing any sepnozzle a greater distance'from the work and aration as it enters the tapering bore 18,0f this permits the sand particles, which are the nozzle. By comparingthe elongated convery hot as they issue from the nozzle, to be ical inlet chamber of my nozzle with the cooled. before they strikethe work so that 40 short outward fiare of prior nozzles, such as they will not injure the same. This latter shown in the patents below mentioned, it will feature is alsoimportant in the operation of be observed that the inclined walls of the sand blasting marble and other surfaces.

elongated chamber serve to guide the mixture I claim toward the axis of the nozzle without the sud- A nozzle for sand blast apparatus having denor abrupt change which necessarily takes an unobstructed elongated inlet chamber hav- "place when the blast strikes the short abrupt ing a length greater than the diameter at its flare of said prior devices. mouth and provided with a conical wall grad- In alluprior sand blast nozzles with'which ually inclined to the axis ofthe nozzle and a I am familiar. of the type employed with apboreextending therefrom and having a slight opening of the nozzle, the converging walls of the conical inlet chambercausing the gradual convergence of the mixture of sand and air entering at the mouth of the nozzle, thereby preventing any separation of the sand particles or accumulation of sand at the'junc- 7 7 ture of the inlet chamber and bore of the i nozzle. a V a In testimony whereof I affix my signature. v W

v SAMUEL NEIKIRK

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