US2594222A - Manifold for molten material spray guns - Google Patents

Description

April 22, 1952 M. A- SANDORA ET AL 2,594,222

MANIFOLD FOR MOLTEN MATERIAL SPRAY GUNS Filed Sept. 27, 1948 2 SHEETSSHEET l 59 INVENTOR.

' MANUEL A. SA/VDOR/l Bg EG/L E. FREEMAN ATTORNEYS April 22, 1952 M. A. SANDORA ET AL 2,594,222

MANIFOLD FOR MOLTEN MATERIAL SPRAY GUNS Filed Sept. 27, 1948 2 SHEE'IS--SHEET 2 84 INVENTOR. L MANUEL A. SA/VDORA a a/1. E. FREEMAN ATTORNEYS Patented Apr. 22, 1952 MANIFOLD FOR MOLTEN MATERIAL SPRAY GUNS Manuel A. Sandora, San Francisco, and Cecil E. Freeman, SanCarlos, Calif., assignors to C. E. Freeman 00., Inc., San Francisco, Calif., a corporation Application September 27, 1948, Serial No. 51,426

3 Claims.

This invention relates to a spray gun and to a manifold therefor. More particularly, it relates to a manifold for a spray gun of the type wherein a suspension of powdered, fusible material in compressed air is formed, and the same is ejected from the gun together with a burning mixture of oxygen and combustible gas.

In spray guns of this character, means heretofore provided for supplying the materials to the gun have been awkward and difficult to manipulate. In spraying a fused solid, such as rubher or metal, on a surface, accurate and rapid control over the supply of solids, air, oxygen and combustible gas are important to achieve quality work and economy. Control means provided heretofore have not achieved these results.

It is an object of the present invention to provide an improved type of spray gun and an improvide manifold therefor.

It is a further object of the invention to provide a manifold for a spray gun or the like, which is compact and readily accessible. and can be manipulated by a single operator to maintain accurate and precise control over delivery of materials to the gun.

It is a particular object of the invention to provide a manifold for a spray gun, which is capable of delivering compressed air and powdered solids, as well as the fuel and oxygen necessary for supplying heat, such manifold being capable of both quick and accurate control of the air and solids and capable of delivering the same in any desired proportion at the instant needed.

These and other objects of the invention. will be apparent from the ensuing description and the appended claims.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the accompanying drawings in which:

Fig. 1 is a side view of the gun and manifold, showing the gun'in section and the manifold partly in section and partly in elevation.

Fig. 2 is a bottom view of the manifold.

Fig. 3 is a diagrammatic view showing the ducts in the manifold.

Fig. 4 is a diagrammatic view of a complete spray gun system.

Referring now to the drawings, the device of the invention in its preferred form comprises a gun ID, a handle H and a manifold I2. The gun I 5 is generally of the type described in Sandora application Serial No. 767,921, filed August 11, 1947, entitled Spraying Device, and it comprises a tubular housing [3, co-axially of which is disposed a tubular member M. The tube I4 is provided with a tapered flange or collar l5 to provide an airtight fit with the forward end of the housing, and at its rearward end it is threaded at l6 so as to be engageable with a nut I! to clamp the tube firmly in the housing and it is provided at its forward end with longitudinal grooves 25.

The tube [4 is provided with a central bore or duct 26 closed at its rearward end as shown and flared at its forward end at 21, and it is also provided with spaced annular flanges 28, 29 and 30 defining annular recesses 31, 32 and 33.. Longitudinal ducts 34 are provided as shown, and radial ducts 35 are provided communicating the annular recess 31 with the ducts 34. Radial ducts 36 communicate the annular recess 33 with the central duct 26. A sleeve 31 is provided, being threaded to the tube I4 and forming an annular passage 38 communicating with the ducts 34. At its forward end at 39, the sleeve 31 is of reduced diameter to provide an offset continuation of the annular passage 38.

In operation, a suspension of solid material in air enters the gun through a duct 45, enters the annular space 33 and passes through the central duct 26. Combustible gas enters through a duct 46, enters the annular recess 32 and passes into the ducts 34 where it is mixed with oxygen entering through a duct 41, annular recess 3| and radial ducts 35. Combustion occurs at the tip of the tube l4, and maximum efficiency results from the manner in which the materials are introduced, and mixed. Among other things, the offset in the annular passage 38 resulting from the grooves 25 in the tube I4 and the reduced diameter of the sleeve 31, results in considerable economy in the use of oxygen.

The handle portion H of the gun assembly comprises mating portions 48, of which only one is shown, clamped together by means of screws 49. Disposed within the handle are tubes 50, 5| and 52 communicating at their upper ends with the ducts 45, 46 and 41, respectively, and at their lower ends with the manifold [2, coupling members 53 being employed with the tubes 5| and 52, as shown.

The manifold [2 comprises a block 54 and it is provided with a plurality of valves and coupling members and is bored to provide a plurality of ducts. As best shown in Figs. 1 and 3, the block 54 is provided with combustible gas and oxygen ducts 55 and 56 controlled by valves 5'! and 58. The ducts 55 and 56 are also provided with coupling members 59 and 60.

As best shown in Figs. 2 and 3, the block 54 is also provided with an air inlet duct 65 controlled by a valve 66 and having a coupling member 61. A branch duct 68 is provided leading from the duct 65 (ahead of valve 66) and controlled by a valve 69. A coupling member 10 is provided for the branch duct 68. A duct H is provided having at one end a coupling member 12 and communicating, at its other end, with the tube 50. As illustrated, the air inlet duct 65 opens into the duct H. As shown in Fig. l, combustible gas and oxygen enter the manifold through tubes 86 and 8|, re-

, spectively, from any suitable source (not shown).

abandoned, entitled Dispenser for Dust and the Like. The dust or finely divided solid which it is desired to spray is contained in the dispenser 84, and a suspension of the dust in air is formed therein and is carried through a tube 85 to the manifold and thence to the gun.

It will be apparent that, by closing valve 66 and opening valve 69, all the air will be sent to the dispenser 84, and that by opening valve 66 and closing valve 69, all the air will bypass the dispenser and go directly to the gun. By appropriate adjustment of valves 66 and 69, any desired proportion of air may be sent to the dispenser or bypass the dispenser. This provides an important operating advantage, in that the operator is enabled to maintain constant, rapid control over the spray gun.

It will also be apparent that, by mounting the combustible gas and oxygen control valves on or adjacent to the manifold block 54, all of the necessary controls are brought within a small compass, thus obviating the necessity of two operators, or of moving the gun from the point of spraying to a distant control point.

While we have shown the preferred form of our invention, it is to be understood that various changes may be made in its construction by those skilled in the art without departing from the spiritof the invention as defined in the appended claims.

7 Having thus described our invention, what we claim and desire to secure by Letters Patent is:

1. A spray gun assembly comprising a tubular gun adapted to deliver a suspension of fusible dust material in compressed air and to provide a flame for heating and fusing the dust, said gun having separate inlets for oxygen, fuel gas and an air-material-mixture; a handle fixed to said gun and having an air-material-mixture duct, an oxygen duct, and a fuel gas duct communicating with said air-material-mixture, oxygen, fuel gas inlets respectively; a manifold fixed to the handle of the gun, said manifold having an air-materialmixture outlet, an oxygen outlet and a fuel gas outlet communicating with said air-materialmixture, oxygen and gas ducts respectively, said manifold also having an air inlet, an air outlet, an air-material-mixture inlet, ducts intercommunicating said air inlet with said air outlet and said air-material-mixture outlet, a duct communicating said air-material-mixture inlet with 4 saidair-material-mixture outlet and a valve in each of said intercommunicating ducts for controlling the flcw of air from the air inlet to said air-material-mixture outlet and the air outlet; a vessel for holding a supply of fusible dust material; lines communicating said air outlet and said air-material-mixture inlet with said vessel to supply air to said vessel and to supply a mixture of air and material to the air-material-mixture inlet; said manifold also being provided with oxygen and fuel supply means including an oxygen inlet and valve and a fuel gas inlet and valve for controlling the supply of oxygen and fuel gas to said oxygen and fuel gas outlets and the ducts respectively.

2. A spray gun assembly comprising a tubular gun adapted to deliver a suspension of fusible dust material in compressed air and to provide a flame for heating and fusing the dust, said gun having a handle and separate passageways in the handle for oxygen, fuel gas, and an air-material mixture, a manifold fixed to the handle of the gun, said manifold having an air-material mixture outlet, an oxygen outlet and a fuel gas outlet communicating with the air-material mixture, oxygen and gas passageways, respectively, said manifold also having an air inlet, an air outlet, an air-material mixture inlet, ducts intercommunicating said air inlet with said air outlet and said air-material mixture outlet, a duct communicating said air-material mixture inlet with said air-material mixture outlet and a valve in each of said intercommunicating ducts for controlling the flow of air from the air inlet to said air-material mixture outlet and'the air outlet, a vessel for holding a supply of fusible dust material, lines communicating said air outlet and said air-material mixture inlet with said vessel to supply air to said vessel and to supply a mixture of air and material to the air-material mixture inlet, said manifold also being provided with to said oxygen and fuel gas outlets and the associated passageways in the handle.

3. A spray gun assembly comprising a tubular gun adapted to deliver a suspension'of fusible dust material in compressed air and to provide a fiame for heating and fusing the dust, said gun having a handle and separate passageways in the handle for oxygen, fuel gas, and an air-material mixture, a manifold fixed to the handle of the gun, said manifold comprising a block bored to provide an air-material mixture passage therethrough communicating at one end with the airmaterial mixture passageway, a first air passage through the block adapted to communicate at oneend with a source of air supply, a second air passage in said block communicating with the first air passage and said air-material mixture passage, a valve in each air passage for controlling the flow of air to said air-material mixture passage and to the first air passage, a vessel for holding a supply of fusible dust material communicating with the first air passage and the other end of said air-material mixture passage to thereby be supplied with air from the first air passage and to supply a mixture of air and materialto the air-material mixture passage, said block also having an oxygen passage therethrough and a fuel passage therethrough, respectively, communicating with the oxygen and fuel gas passageways in said handle, and a valve in each 'of the latter-named passages for controlling the supply of oxygen and fuel gas to the gun.

MANUEL A. SANDORA. CECIL E. FREEMAN.

REFERENCES CITED UNITED STATES PATENTS Number 1,617,166

Name Date Schoop Feb. 8, 1927 Number 6 Name Date Pahl Apr. 29, 1930 Bramsen et a1. Feb. 4, 1936 Benoit Mar. 9, 1937 Blow Sept. 28, 1937 Lensch et a1 Oct. 19, 1937 Ingham Jan. 7, 1941 Shepard Mar. 26, 1946 Duccini et a1. Sept. 16, 1947 Sandora, et a1. June 6, 1950 Duccini et a1. Mar. 6, 1951

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