US2552907A

US2552907A - Spray gun

Info

Publication number: US2552907A
Authority: US
Inventors: Donald J Peeps
Original assignee: DeVilbiss Co
Current assignee: DeVilbiss Co
Priority date: 1947-11-26
Filing date: 1947-11-26
Publication date: 1951-05-15
Anticipated expiration: 1968-05-15

Description

D. J. PEEPS May 15, 1951 SPRAY GUN Filed Nov. 26, 1947 s TE NP W. NJ ...D L A N O D ATTORNEY Patented May 15, y1951 SPRAY GUN Donald J. Peeps, Toledo, Ohio, assignor to The De Vilbiss Company, Toledo, Ohio, a corporation of Ohio Y Application November 26, 1947, Serial No. 788,288

2 Claims.

This invention relates to a spray gun and particularly to such a device which utilizes compressed air for atomization and has a manually operated trigger for opening the air and spray material control valves.

The principal object of the invention is to pro'- vde a spray gun of the type described which is compact in design.

Another object of the invention is the provision of a spray gun which is inexpensive to produce.

These and other objects and advantages which will be more apparent upon reading the following description and by reference to the drawing, and secured by having an air valve of tubular form through which the spray material needle valve extends and by the use of a trigger shaped for eiiicient operation within minimum space.

In Figure 1 of the drawing is shown a vertical section of a spray gun embodying my invention;

-Figure 2 is a vertical section taken on line 2-2 of Figure 1 through the upper portion of the spray gun and of the trigger; and

Figure 3 is a rear elevation of the trigger alone.

Referring to the drawing, the spray gun has a main body I with a depending handle 2. At the bottom end of the handle is a connection 3 for an air supplying hose. This connection communicates with the upwardly extending passage 4 which terminates in the horizontal bore 5. Within this bore is an air valve cage 6. The cage has a rearwardly facing internal circular seat I against which the sealing ring 8 oi the tubular air valve 9 abuts. Between the forward end of the valve cage S and a supporting ring I0, is held packing II. The cage is held in place by a tubular stud I2 threaded into the rear end of the bore 5. A packing gland I3 is threaded within the inner end of the stud and holds packing I4 around the tubular valve 9.

The air valve is normally held to its seat by a spring I5 which is thrust against the outer end of the valve from within an annular housing formed around the rearward end of the spray material needle valve I6 within the needle tail piece I'I. The latter is integral with the needle and has an outer flange I8 against which the needle seating spring I9 bears. This spring is supported at its outer end by the adjustable needle stopping screw which is threaded into the stud I2.

When the air valve 9 is moved from its seat the air from passage 4 enters the cage 6 through ports 80. After passing the seat 'I it travels through ports 2I in the cage out passage 22 into horizontal bore 23 which extends forwardly Where it communicates with

passages

24 and 25 leading respectively to the horn passages 26 and atomizing air discharge chamber 21.

Below the forward end of the spray gun body I is a spray material inlet 28. This connects with the passage way 29 and the spray material discharge .tip 30. Theoutlet port 3| of the tip is closed by the forward end of the needle valve I6.

A packing nut 32 holds packing 33 around the stem of the needle valve. A manually operable trigger 34 for opening the air and spray material valves is pivotally mounted on stud 35. The upper arms 3S of the trigger reach opposite ends of the stud 35 through cavities 3l and 38, one on each side of the horizontal bore 23.

Turned inwardly from the rear edge of the lower portion of each arm of the trigger is a lip 39 with a rounded bulge 49. As the trigger is moved rearwardly by its nger receiving surface 4I, the rounded bulges 40 contact the forward end of the tubular air valve 9 and move it from its seat I. As the valve is moved rearwardly, it meets the forwardend of the tail piece I'I of the needle valve IG and moves the latter rearwardly from its seat in the tip 30.

It may be noted that the telescoping arrangement of the air and material valves considerably reduces the space required as compared to having them positioned at separate points within the spray gun body.

The springs for the valves are also nested one within the other and space is also saved in their arrangement. As the tubular air valve extends completely through the air valve cage, there is no possibility of a leak between this valve and the spray material valve. The packings II and I4 provide a seal between the air valve and the body.

The trigger design enables it to be made out of one piece, while at the same time includes a well supported rounded surface for contact with the air valve.

From the above description it will be apparent that the invention resides in certain principles of construction and operation which may be embodied in other physical forms, and it is not desired therefore to be restricted to the exact disclosure, but rather to the scope of the appended claims.

What I claim is:

1. In a spray gun of the type described a tubular air valve, a spray material needle valve extending through the air valve, a forwardly facing thimble-like tail piece xed upon the rear end of the needle valve, a spring seating within the tail piece in encircling relation to the needle valve and with its forward end thrust against the rear end of the tubular air Valve, an outwardly extending circumferential flange on the farward end of the tail piece and a needle Valve spring encompassing the main portion of the tail piece and thrust against the rearwardly facing side of the flange urging the needle Valve forwardly to its seating position.

2. In a spray gun of the type described a spray nozzle at the forward end of the gun, an air passage and a spray material passage leading thereto, said air passage including a bore in the rearward portion of the spray gun, an inwardly extending annular shoulder at the forward end of the bore, a tubular air valve extending through the bore, a spray material needle valve seating in the spray nozzle and extending rearwardly through the tubular air Valve, a laterally ported cylindrical air valve cage extending into the bore in surrounding relation to the air valve and supported at its forward end by the inwardly extending shoulder of the bore, a compressible sealing member held between the shoulder and the end of the cage, the inner portion of the sealing member having a sealing contact with the tubular air valve, a collar threaded within the rear 4 and of the bore contacting and holding the valve cage in place, and a packing retainer within the forward end of the collar holding packing around the rear end of the tubular air valve.

DONALD J PEEPS.

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

UNITED STATES PATENTS Number Name Date 1,650,686 Binks Nov. 29, 1927 1,689,848 Anderson Oct. 30, 1928 1,950,779 Bramsen Mar. 13, 1934 1,958,730 Tracy May 15, '1934 1,962,911 Roselund June 12, 1934 2,101,164 Bramsenet al. Dec. 7, 1937 2;) 2,110,052 Paasche Mar. 1, 1938 2,146,416 Brams'en et al. Feb. 7, 1939 2,266,365 Harrison et al Dec. 16, 1941 2,362,834 Larson Nov. 14, 1944 3 FOREIGN PATENTS Number Country Date 518,406 Great Britain Feb. 26, 1940