US2578412A - Spray gun for comminuted material and adhesive - Google Patents

Description

Dec. 11, 1951 E. J. FISHER SPRAY GUN FOR COMMINUTED MATERIAL AND ADHESIVE Filed Jan. 10, 1950 2 SHEETSSHEET l Dec. 11, 1951 E. J. FISHER 2,578,412

SPRAY GUN FOR COMMINUTED MATERIAL AND ADHESIVE Filed Jan. 10, 1950 v 2 SHEETS-SHEET 2 Patented Dec. 11, 1951 UNITED STATES PATENT OFFICE SPRAY GUN FOR COMMINUTED MATERIAL AND ADHESIVE Emery J. Fisher, Chicago, Ill.

Application January 10, 1950, Serial No. 137,873

2 Claims. 1

My present invention relates to guns for spraying .comminuted materials and simultaneously spraying a liquid onto the blast of comminuted material as it leaves the gun. More specifically, the invention relates to certain innovations and improvements in the type of spray un disclosed in Patent No.i2,433,463, issued December 30, 1947, to A. J. ,Lampe.

"This type of spray un is particularly useful for "spraying comminuted insulation materials .onto walls or other surfaces. "In order for the comminuted material, which may be for heat or sound insulation, to adhere to the wall surface and form a continuous blanket, it is necessary to at least partially coat the individual particles or pieces with asuitable'binder or adhesive. This method or technique of applying and building up mats of'insulation on selected surfaces is disc'l'osed'in Patents Nos. 1,718,507, 1,888,841, 2,179,- "6779 to Wenzel 'et al No. 1,837,422 toFix, and No. 1,978,125 to Bennett.

T'Ihespray gun disclosed in detail in Lampe Patent'No. 2,433,463 has proven, through extendejd experience, to be a satisfactory device for the purpose intended. .Even-so, by the present invention I am able to transform the iLampe type spray gun'into one which functions even more satisfactorily in several respects.

Theobject of the invention is the provision of aspray'gun of the "type shownand described in the 'Lampe *Patent' No. 2.433,,463, which in comparison-twith theLampe type structure is: (1') easier'an-d cheaper to build; (2) "has-increased efficiency and capacity for the same-side unit; -(3')provides a more trouble-free construction;

and (4) is easier to handle and more convenient to take down and clean. I

"Certain other objects of the invention will; in

part, be obvious and will, in part, appear hereinafter.

*For a morecomplete understanding of the nature andscope of-my-invention, reference may now'be had to the following detailed description thereof-taken in connection with the accompanying drawings; wherein:

Fig. 1 is a toppla'n view of a spray gun in the horizontal position forming one embodiment of the present invention;

"Fig.2 is *airoht end elevational view of the spray gun shown in Fig. 1;

Fig. 3 is a sectional view taken-on line'3'-3 of 1 Fig ids-"a longitudinal sectional view takenon line 44 of Fig. 2; I

=Fi'g. 5'is an enlarged detail sectional view taken Fig. ;6 is an enlarged elevational view of the base section of the annular spray head shown withthe cover section removed therefrom; and

Fig. 7 is an enlarged elevational view on the same scale as Fig. 6 showing the rear side of the spray head cover section with the rubber gasket partially broken away.

Referring now to Fig. 1 of the drawings, the spray gun is indicated generally at I0 and ineludes a central pipe or conduit I I through which comminuted insulating material is adapted to be blown under pressure in large volumes,;and;an annular-shaped liquidspray head I2 fitting over Lie discharge end of the central pipe II. The annular spray head I2 is supplied with liquid adhesive under pressure through a small diameter conduit I3, and is supplied with air under pressure throughthe small diameter conduit I4. The conduits I3 and I4 communicate with inlet passageways provided in the base section I5 of the spray head I2 aswill be described in detail below.

The present invention resides in the construction of the annular shaped liquid spray head I2 with the other portions of the spray gun I0 corresponding to the construction disclosed in the Lampe Patent 2,433,463. The spray head I2is adaptedto be interchangeable with the spray heads previously used on-the spray guns ofthis type.

The spray head I;2 has two main parts. One is the-annular shaped base section I5 and-the other-isthe annularshaped cover lfi -therefor.

Each of these sections has a central opening whichpermits the respective sections to fit 'over the discharge end of the central tube I I. The sprayheadIZ isheld in position on the discharge end of the central pipe II by the two conduits I53 and ltrunning along opposite sides thereof. These conduits extend through openings provided-therefor in ears I7- and I8 integrally projecti-ng onopposite sides of a ring or collar member 2-6whichfits over the central pipe II. -A set wall-24. "The annular wall 2B forms the exterior side wall of theseetion "I5. "The annularwall 28 forms the inner side wall of the spray section I5 and defines a portion of the length of the opening through the base section I5 for receiving the pipe II. The annular wall 2! is intermediate between the annular walls 23 and 23 and serves to separate or partition the forward part of the base section I5 into an inner continuous annular chamber 33 and an outer continuous annular chamber 3 I. It will be noted that the front edges of the annular walls 26, 2'! and 28 all lie in the same vertical plane.

As will be more completely described hereinafter the inner chamber 33 serves as the distributing or manifold chamber for supplying liquid to the several nozzles mounted in the cover section I6. The outer chamber 3I serves as the distributing passageway or manifold for supplying air to each of these nozzles. Liquid adhesive and air, both under pressure, are admitted to the respective annular chambers 35, 3I from the rear side of the base section I5 through straight openings 01 ' ports 32 and 33, respectively (Fig. 3) extending through the ears I9. The passageways 32 and 33 are tapped or threaded for a portion of the distance into the rear of the base section I5 so as to receive the threaded ends of the conduits or pipes I3 and I4. The passageways 32 and 33 are symmetrically located 180 apart and the centers of these passageways are located the same radial distance from the center of the base section I5.

It will be noted from Figs. 3 and 6 that the passageway 32 for the adhesive leads directly into the annular chamber 30. Because of its symmetrical location, the passageway 33 would also lead directly into the chamber but it is baflied or separated therefrom by means of an inwardly protruding bulge or deformity 34 in the partition wall 27 which is shown to advantage in Fig. 6 This bulge 34 serves to place the air inlet passageway 33 into communication with the annular air distributing chamber 3 I.

The feature of having the adhesive and air passageways 32 and 33 extend directly through the rear wall 24 of the base section I5 without bends or turns, is an important one from several standpoints. From the standpoint of cost of production, it is the most economical and inexpensive design obtainable. For example, base section I5 will normally be a casting and the passageways 32 and 33 may be formed directly in the casting leaving only the tapping or threading operation to be performed. If the base section I5 is formed in other ways than by casting, the formation of the passageways 32 and 33 will still constitute an inexpensive and convenient operation. From the standpoint of operation, the large diameter, straight admission passageways 32 and 33 permit efficient delivery of adhesive and air under pressure. Since there are no turns or restrictions in the passageways 32 and 33, the adhesive and the air are delivered without loss of velocity or pressure such as occurs in passing around a sharp bend or through a constricted passageway. Also, the unrestricted and straight inlet ports 32 and 33 eliminate pulsations due to irregularities in flow.

Referring to Figs. 4 and 6, it will be noted that the annular wall 2? is provided with four integrally formed, diametrically opposed, bosses 35-35. This number could, of course be larger or smaller. Each of these bosses is tapped so as to receive the threaded end of a bolt 36 which, together with the other three bolts 36 serve to securely clamp the cover section IS on the base I5. The bolts 36 have heads 31 which are circular on the outside and which have hexagonal socket openings 38 (Fig. 2) formed therein for receiving a socket wrench. The cover section I5 is provided with four counterbored recesses 40-40 so that the bolt heads 31 are located below the front surface of the cover section IS.

The inner annular wall of the base section I5 is provided with diametrically opposed bosses or ears 4I4l as shown in Figs. 4 and 6 which are provided with recesses or depressions 4242 in the top surfaces thereof for receiving the ends of a pair of bolts 43--43 which may be used to forceably separate the cover section I6 from the base section I5. The bolts 43 extend through threaded openings provided therefor in the cover I5, these openings being counterbored as indicated at 44 so as to provide space for the cylindrical bolt heads 45 These bolt heads 45 are provided with hexagonal sockets 49 as indicated in Fig. 2. For convenience, the sockets 49 and the sockets 38 are of the same size so that the one tool may be used for the bolts 36 and 43.

The cover section I6, has in part, been described above. It has a rear portion 46 of enlarged diameter so as to exactly cover or match the open face of the base section I5. The cover section I3 is of generally solid construction except for where it has been tapped to receive the adhesive spray nozzles 41-41 and the bolts 36 and 43. In the rear face of the cover section I6 an annular, V-shaped groove 48 is provided which opposes and has the same width at the base as, the annular air chamber 3I in the base section I5.

Referring to Fig. 5 it will be seen that each of the nozzles 41 fits in a tapped opening provided therefor through the cover section I6, these tapped holes being six in number and being symmetrically located. It will of course be understood that a smaller or larger number of the nozzles may be used. A preferred arrangement of the nozzles 41 is to have each diametrically opposed pair aligned so as to discharge spray streams which converge at a specified distance in front of the gun 15, this distance being different for each of the three pairs of nozzles. For example, very satisfactory operations have been obtained when one pair of the nozzles converge at 24 inches, a second pair converge at 32 inches and the third pair converge at 40 inches, in front of the gun I5. Again, it will be understood that these distances are not critical and other distances may be used as desired.

The nozzles themselves and their particular converging arrangement does not form a feature of the present invention.

In fact, the spray nozzles used in the aforementioned Lampe Patent 2,433,463 can be used in thespray gun I9. Each of the nozzles 41 is provided with an insert member 53 which screws into the central opening through the nozzle from the rear side so as to form an inlet passage for admitting the liquid adhesive into the nozzle chamber 5|. Air under pressure is admitted to the chamber 5| through a communicating passage 52 communicating with the V-shaped annular groove 46 at one end and with the nozzle chamber 5I at the other. The air and the adhesive discharge from each of the nozzles 41 through the nozzle-opening 52.

It will usually be desirable to employ an annular gasket 53 between the base section and the cover I6. Referring to Fig. 7 it will be noted that the gasket 53 has openings 54-54 for the rear end of the nozzles 41; smaller diameter holes 5 55-5 fo e. i rfilem ie be t WWW-W dia .01 3 f rlthebover. sep atin -Q bol s 43 d 1, sq e; or, e ne larv wi dows 51 5] overlying as circumferent lly passages'bz fiz. I

When the clamping bolts 3 636 are turned, down so as" to securely drawfthe' coverfsection I6 onto the base sectionlfijwith the gasket 53 compressed th e'rebetween, the top surfaces'offthefour bosses 35-35 .serve as reinforcing piers to evenly and uniformly support the pressure between the sections l5 and lewith the top edge of the annular wall 2'! bearing a portion of this load. The inwardly protruding bulge or deformity 34 also constitutes a reinforcement for"supporting this bearing load? Because ofthisfarrangement an even and, tight fit between thecover it and the base its assured without, any tendency toward warping ortwis'tingfoibinding of'the clamping bolts 36. This secure and even fit permits the gun Hi to be usedunder'high'pressure withre spect to the liquid adhesiveend atomizing air. The bosses 35-35 also serve to prevent adhesive in the chamber 30 from contacting and fouling the clamping bolts 36.

Heretofore, difficulty has often been encountered in taking apart a spray gun of the type to which gun [0 belongs, for cleaning or adjustment of nozzles, after it has been used. The adhesive sets and tends to secure the parts together so that the cover I 6 cannot be easily removed. However, in the gun ID, the separating bolts 43 are used to break the adhesive seal so that the cover It may be readily removed. Thus, in removing the cover l6 from the base l5, the four clamping bolts 36 are first unscrewed and then the separating bolts 43-43 are turned in. As soon as the ends of these bolts 43 engage in the bottoms of the recesses 42 a separating force is exerted between the cover 16 and the base I5. By alternately turning first one of the bolts 43 and then another, the cover [6 is forced evenly away from the base I5 so that it may be readily removed by sliding off the forward end of the central pipe I I.

It will be understood that certain changes and modifications may be made in the embodiment of the invention described above and shown in the accompanying drawings, without departing from the spirit and scope of the invention.

Having fully described the invention and a preferred embodiment thereof, what is claimed as new is:

1. An annular shaped liquid adhesive spray head for combination on a gun for blowing comminuted material onto a wall surface and simultaneously spraying a liquid adhesive onto the blast of comminuted material as it is discharged from the gun, said gun having a central pipe through which the comminuted material is blown and over the discharge end of which said spray head fits and from the rear of which spray head conduit connections extend for separately supplying liquid adhesive and air under pressure thereto, said annular shaped spray head comprising, in combination: a flat annular base section; a flat annular interfitting and matching cover section therefor; and clamping bolts for securing said sections together; said base section having inner and outer annular shaped chambers formed therein which open toward the front side thereof, said inner and outer chambers being separated from each other and in part defined by an intermediate annular partition projecting forwardly from the rear wall of said base section, an inner 'shapedannular groove 8" t ring 'withi'the 'air jecting forwardly from said r ar; wall, andforfm-i ing theouters'ide wall of said outer annular chamber, said'rear wall having a pair of circum" ferentially spaced diametrically aligned.

straight adhesive and air admission passageways extending therethroughv parallel to the principal" axis 'of said base section, said annular partition:

' having an inwardlyjprotruding bulge therein ex chamber; said inlet, passageways being adapted. to be connected with said conduit connections;

for separately supplying'liq'uid adhesive and air;

to thefrespectiyeannular chambers, and aplu' rality of circumferentially spaced integral bosses protruding from said intermediate annular ar: tition with the faces of said bosses coplanar with the front edge of said annular partition and having holes tapped therein parallel to the principal axis of said base section for receiving said clamping bolts, said cover section comprising an annular member adapted to fit over and mate with said base section soas to close off said inner and outer annular chambers, said annular member having circumierentially spaced nozzle-receiving sockets therein which communicate at their bases with said inner annular chamber, and having individual passageways therein corresponding in number to said sockets and providing communication between said outer annular chamber and each of said sockets intermediate the opposite ends thereof.

2. An annular shaped liquid adhesive spray head for combination on a gun for blowing comminuted material onto a wall surface and simultaneously spraying a liquid adhesive onto the blast of comminuted material as it is discharged from the gun, said gun having a central pipe through which the oomminuted material is blown and over the discharge end of which said spray head fits and from the rear of which spray head conduit connections extend for separately supplying liquid adhesive and air under pressure thereto, said annular shaped spray head comprising, in combination: a flat annular base section; a flat annular interfitting and matching cover section therefor; clamping bolts for securing said sections together; and separating bolts for prying said sections apart; said base section having inner and outer annular shaped chambers formed therein which open toward the front side thereof, said inner and outer chambers being separated from each other and in part defined by an intermediate annular partition projecting forwardly from the rear wall of said base section, an inner annular wall projecting forwardly from said rear Wall and forming the inner side wall of said inner annular chamber, an outer annular wall projecting forwardly from said rear wall and forming the outer side wall of said outer annular chamber, said rear wall having a pair of ciroumferentially spaced and diametrically aligned straight adhesive and air admission passageways extending therethrough parallel to the principal axis of said base section, said annular partition having an inwardly protruding bulge therein extending part way into said inner annular chamber, said bulge being in coaxial align,-

went with one of said inlet passageways whereby that passageway communicates solely with said outer annular chamber, the other of said inlet passageways communicating into said inner annular chamber, said inlet passageways being adapted to be connected with said conduit connections for separately supplying liquid adhesive and air to the respective annular chambers, a plurality of circumferentially spaced integral bosses protruding from said intermediate annular partition into said inner annular chamber with the faces of said bosses coplanar with the front edge of said annular partition and having holes tapped therein parallel to the principal axis of said base section for receiving said clamping bolts, and at least one pair of diametrically spaced integral ears protruding from said inner annular wall into said inner annular chamber, said ears having bolt end receiving recesses in the front surfaces thereof for receiving the ends of said separating bolts; said cover section comprisin'gan annular member adapted to fit over and mate with said base section so as to close off said inner and outer annular chambers, said annular member having circumferentially spaced nozzle-receiving sockets therein which communicate at their bases with said inner annular chamber, and having individual passageways therein corresponding in number to said sockets and providing communication between said outer annular chamber and each of said sockets intermediate the opposite ends thereof.

EMERY J. FISHER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,718,507 Wenzel et a1. June 25, 1929 28 2,255,189 Robinson et a1 Sept. 9, 1941 2,402,743 Firth June 25, 1946 2,433,463 Lampe Dec. 30, 1947

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