US2684866A - Spray nozzle - Google Patents

Description

T. c. SELWAY SPRAY NOZZLE July 27, 1954 Filed April 17, 1952 I N VENTOR 7"f/0N/75 C. 554 W);

7 w I z a v I a,

ATTORNEY Patented July 27, 1954 SPRAY NOZZLE Thomas C. Selway,

Baltimore, Md., assignor to The Glen L. Martin Company, Middle River, Md., a corporation of Maryland Application April 17, 1952, Serial No. 282,757

2 Claims. 1

This invention relates to spray nozzles for applying paint or similar materials to surfaces, and more particularly to a nozzle for applying a coat of paint to inaccessible surfaces such as the interiors of pipes and tubes and the like.

Since a conventional paint spray nozzle gives a fan-shaped spray directed in a generally forward direction, it is unsatisfactory for painting the interiors of cylindrical objects of small diameter or the lateral interior walls of structures which are accessible only through small access openings. To satisfactorily coat such surfaces it is necessary to pI'OVide a spray nozzle which will give a uniform peripheral spray directed substantially normal to the axis of the nozzle. This type of nozzle is especially advantageous in the case of pipes or tubes since one pass through the pipe with the nozzle mounted on a supply tube of suitable length is sufiicient to fully coat the entire inner surface of the pipe.

In the case of exceptionally long pipes, tubes, or similar cylindrical objects, where th needed length of the supply tube to which the nozzle is aflixed would be impractical, the object to be painted may be placed in a vertical position and the nozzle lowered through the object at the end of a flexible supply hose.

In addition to providing a uniform uninterrupted radial spray, the nozzle contemplated provides for adjustment of the discharge opening, so that the density of the spray may be regulated, and coating materials of different viscosities may be effectively applied by use of the same nozzle.

It is the object of this invention to provide a paint spray nozzle which will give a uniform radial spray directed substantially normal to the longitudinal axis of the nozzle.

It is another object of this invention to provide such a spray nozzle in which the discharge opening is variable to adjust the density of the spray and to adapt the nozzle for use with coating substances of various densities and viscosities.

It is still another object of this invention to provide a spray nozzle the construction of which is adapted for rapid and simple disassembly to free the nozzle from clogging and for cleaning, and the discharge opening of which is readily and easily adjusted.

These and further objects of this invention will become apparent from the following description taken in connection with the accompanying drawings.

In the drawing:

Fig. 1 is a view of the nozzle shown connected to a supply tube.

Fig. 2 is a sectional view of the nozzle showing its interior arrangement.

As shown in the drawing the nozzle consists of an inner tubular member I, an external sleeve member 2, and an inlet member 3.

Inner member I consists of a deflecting head 4, and a tubular stem 5 of somewhat smaller diameter extending rearwardly from. the head. A passage 6 extends axially through the interior of the stem 5 and terminates at the junction between the head 4 and the stem.

The rear portion of the stem 5 is threaded externally and carries the cylindrical sleeve 2 by means of mating internal threads 1 at the rear end of the sleeve.

Sleeve 2, which is preferably of the same outer diameter as deflecting head 4, has an inner diameter somewhat larger than the stem 5 and extends coaxially therewith to form an annular chamber 8 surrounding the stem. The walls of the sleeve extend forward and terminate aft of the rearward facing shoulder 9 of the head 4 so as to form an annular discharge opening I 0 completely surrounding the nozzle. A series of openings I I in the wall of stem 5 serve to provide communication between the passage 6 and the annular chamber 8.

The inlet member 3 is provided with internal threads I2 at its aft end to receive the adapter fitting I3, and is threaded internally at its forward end so as to engage the exterior threads at the rearward end of stem 5.

Inlet tube I4 is connected to adapter fitting I3 and serves to conduct the coating fluid from a pressurized source of supply (not shown) to the nozzle.

The coating fluid enters the nozzle through the inlet member 3 and passes into the passage 6 from whence it travels through the openings II into the annular chamber 8 and radially outward through the discharge opening I 0, being distributed in a peripheral spray, the density of which is determined by the width of the discharge opening Ill.

Sleeve 2 is provided with a knurled surface I5 for convenient rotation so that the sleeve may be adjusted axially on stem 5, thus allowing adjustment of the width of discharge opening I0 to regulate the spray. Inlet member 3 is also provided with a knurled surface at I6 and acts as a lock nut to lock sleeve 2 in place on stem 5.

The arrangement above described provides a simple and readily adjustable spray nozzle which will deliver a completely circular spray of desired density in a plane substantially normal to the axis of the nozzle, thus effectively coating the lateral interior walls of pipes, tubes, and structures whose interiors are inaccessible to a conventional spray gun. Since the spray is delivered from the entire periphery of the nozzle, a simple axial motion of the nozzle through a tube will completely coat the interior, no rotative motion of the nozzle being necessary.

Because of its simplicity of construction the nozzle may be easily and rapidly disassembled by hand for cleaning or removal of clogging materials. Adjustment of the nozzle to vary the intensity of the spray or to accommodate fluids of various densities is likewise easily accomplished by hand.

It is to be understood that the invention herein described is not confined to the precise detailsof construction set forth, as it is apparent that many changes and variations may be made without departing from the scope of the invention, and no limitation is intended by the phraseology of the foregoing description of the illustrations in the accompanying drawings.

I claim as my invention:

1. A spray nozzle comprising a cylindrical housing member, a sleeve member mounted within said housing member, said sleeve member having a threaded portion on the inner end thereof adapted to engage corresponding threads on the inside of saidhousing member, the outer end of said sleeve being formed with a deflecting head having an outside diameter substantially the same as the diameter of said housing member, the inner edge of said head cooperating with the end of said housing member to form a peripheral slot, the axial width of said slot being adjustable as said head and sleeve are moved relative to said housing member, said sleeve member having a portion between said head and said threaded portion of smaller diameter than the inside of said housing member forming an annular chamber with which said peripheral slot communicates, said smaller diameter 'portion of said sleeve having apertures formed therein, a cylindrical looking member of substantially the same diameter as said housing member having internal threads to engage the threaded portion of said sleeve member, said locking member adapted to abut the end of said housing member to maintain a predetermined adjustment on the axial width of said peripheral slot.

2. The device described in claim 1, wherein a hose connection is secured to said cylindrical locking member.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,070,872 Bond Aug. 19, 1913 1,098,884 Comstock June 2, 1914 1,779,691 Bennett Oct. 28, 1930 2,556,537 Harvey June 12, 1951

Images