US1889979A - Sand blast nozzle - Google Patents

Description

Dec. 6, 1932.

V. W. FALARDEAU `SAND BLAST NOZZLE Filed Jan. 20, 1932 Patented Dec. 6, 1932 UNITED STATES PATENT @Frffcng VICTOR W'. FALARDEAU, OF WATERBURY,

VERMONT, ASSIGNOR T' COOLEY-WRIGHT- PORATION 0F VERMONT SAND BLAST NOZZLEI Application filed January 20, 1932. Serial No. 587,733.

The principal objects of this invention are to provide a sand blast nozzle with means for reducing the stopping of the flow of sand through it by the plugging of the nozzle and to provide a nozzle by which this means consists of an elements of the nozzle itself and does not involve any additional parts or any material amount of increased expense.

Other objects and advantages of the invent-ion will appear hereinafter.

Reference is to be had to the accompanying drawing, in which Fig. 1 is a side View of a sand blast nozzle and holder constructed in accordance with this invention shown partly in section;

Fig. 2 is a diametrical sectional view of the nozzle itself;

Figs. 3 and el are end views as indicated respectively by the arrows 3 and 4 in Fig. 2, and

Fig. 5 is a view similar to Fig. 2 showing a modified construction.

It is common knowledge that the ordinary sand blast nozzle is subject, owing to the crowding action of abrasive, to being plugged or stopped up so as to stop the flow of the sand. This action occurs in all ordinary nozzles, necessitating the disassembling of the parts and removal of the sand. As the ordinary nozzle is constructed the action becomes Worse the longer the nozzle is used because the end of the nozzle is concave at the start or becomes concave by continuous usage.

ln accordance with this invention the concaved entrance end of the nozzle is eliminated and this surface is made convex so that the mixture of abrasive and air coming against this surface will not tend to crowd in to any cup-shaped entrance but will be forced away from the same.

Referring to Figs. 1, 2, 3 and 41 the holder for the nozzle is shown in the usual way comprising a screw-threaded member having a rubber or other soft packing ring 11 at the end and a nut 12 having an inwardly extending lip 1.3 for holding in the nozzle 111-.

The nozzle is provided as usual with a circular flange 15 adapted to be received between the packing ring 11 and the lip 13 for holding the nozzle in place. The nozzle, of

course, is conical and has a passage 16 all the way through it for the abrasive. This nozzle is bored in at its large end to provide a cylindrical recess 17 having at the bottom of it a convex surface 18. Of course, a drill is introduced part way in the form this cylindrical hole 17 so as to leave this convex surface 18 to receive the full current of abrasive and air. The current, of course, is of a smaller velocity in this passage 17 than it is in the discharge passage 16. The convex surface 18 which the abrasive engages will cause it to bound back and disperse into the current of air. No collection of abrasive material can occur directly at the end of the passage 18.

A larger nozzle 21 is shown in Fig. 5 having this convex surface 2O at its extreme end and the passage 22 for the air going all the way through. The flange 28 is shown and the way it is assembled will be obvious Without further illustration. The same principles apply as in the other case and in most cases the plugging or blocking of the nozzle is overcome.

Although I have illustrated and described only two forms of the invention I am aware of the fact that other modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore T do not wish to be limited in this respect but what I do claim is 1. As an article of manufacture, a sandblast nozzle having a passage therethrough for the discharge of abrasive and air and a convex surface at the entrance end of said passage for receiving the blast of abrasive and sand against it before it enters the passage.

2. As an article of manufacture, a sand blast nozzle having a passage therethrough for the discharge of abrasive and provided, at the entrance end of said passage, a conveX surface surrounding and extending beyond said passage to receive the impact of the abrasive and disperse it.

3. As an article of manufacture, a sand blast nozzle having a passage therethrough for the discharge of the abrasive, a recess in its entrance end of larger size than the passage, and a convex surface at the end of said recess and at the inner end of said passa e.

4. blast nozzle having a passage extending all the Way through it for the discharge of the abrasive and provided on its entrance end With a convex surface for receiving the impact of the abrasive.

' In testimony whereof I have hereunto afixed my signature.

VICTOR W. FALARDEAU.

s an article of manufacture, a sand.

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