US2438462A

US2438462A - Metered spraying device for mixed liquids

Info

Publication number: US2438462A
Application number: US543076A
Authority: US
Inventors: Ronald B Smith
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-07-01
Filing date: 1944-07-01
Publication date: 1948-03-23
Anticipated expiration: 1965-03-23

Description

R. B. SMITH March 23, 1'948.

METERED SPRAYING DEVICE FOR MIXED LIQUIDS Filed July l, 1944 2 Sheets-Sheet 1 INVENTOR.'

MUM,

March 23, 1948. R. B. SMITH 2,438,462

V METERED SPRAYING DEVICE FOR MIXED LIQUIDS Filed July l, `1944 2 Sheets-Shea?l 2 Patented Mar. 23, 1948 UNIT-ED ST'TES iQFFEICE METERED SPRAYINGDEVICE role yMIXED LIQUIDS Ronald B. Smith, East Orange, N. 7^J

Application July '1, 1944, 'SerialNm J543,076

Heretofora'as I am Well aware, as set forth in v :Patent No. 2,197,730 of April Vle, 1940, it .has-been proposed to provide pumping Vequipment capable of delivering mixed liquids and proportioning the same at selectively variant pre-determined rates, but such equipment was complicated to construct and manipulate besides being cumbersomeand relatively expensive 'to manufacture. My invention, vwhile vrealizing many, if not all of the advanta-ges of such equipment, ris free from those drawbacksand -withal is extremely dependable in operation, readily portable and convenient to manipulate.

The invention is fully set forth in the following detailed description and drawings forming a part thereof in which latter Figure 1 is a side elevation of a spray gun embodying one form of the invention;

Figure 2 is a longitudinal section taken on the line 2-2 of Fig. 1;

Figure 3 is a transverse section taken on the line 3-3 of Fig. 1;

Figure 4 is a longitudinal section taken on the line 4 4 of Fig. 2; and

Figure 5 is another longitudinal section taken on the line 5--5 of Fig. 2.

Referring to the drawings and the construction shown therein, the reference number I designates the housing of the spray gun, 2 the grip, 3 the nozzle portion of each housing, 3 the nozzlel carried thereby and 4 the fluid chamber of a fluid-drive motor which serves to drive a pair of gear pumps hereinafter described. Said motor is of well known construction7 the same includingI an eccentrically mounted, cylindrical rotor element 5, having elastically mounted opposed vanes or blades 5', that is mounted on an axle 6. The latter projects through the removable plugs a-a that in turn seal the ends of said chamber fl. Gear elements are mounted on the reduced outer ends of said axle, the same being rigidly xed thereon by butterfly or

wing nuts

8 and 8. A

-compres'sedf'air hoseor so-called air line 9 is con-- 'nected V'to--the hollowboss '9' on the rear end of said'ho'using, Y'tliefs'ame being adapted to deliver air into the vduct l0 \whichfserves to distribute `the same 'via -the Yauxiliary ducts Il vand l2 to the said chamber lllin which'it drives the rotor and to mixing chamber of said nozzle 3. Needle valves i3 Vand M control lthe amount of air ad mitted to' the chamber "4 and the Amixing chamber b, respectively. "Two gear pumps are respectively mountedinthe forward end of the gun, the same comprising fluid chambers l5 and I5 in each of which arepositioned-a pair 'of meshing gears EES and l,'whicharelrotatably'inounted on the stub shaftsllla'nd'fllrespectively Variable gears It and S 5are -mounted respectively on the shoul xdere'olouterends'of each-'of the axles Il, the same Abein-g fixed thereon by butterfly nuts IS and lil respectively. Slotted fsupport arms 2li and 2s' aremount'edonthe axle v6, the said arms being respectively "interposed between the gears 'l and -lfand the adjacent V'faces of said end plugs d, Retainer bolts 2-2, l22' projectcentrally through variable gearsV 23H, 23 andalsothrough the slots inthe arms 2l), 20', -the same being adapted to receive locking wing nuts 24, 24', which serve to maintain said gears 23, 23' in any adjusted posi-- tion on their respective support arms. Each or the latter arms has an integral, accurate, slotted adjusting leg, as designated by the numerals 25 and 25', and studs 21., 21', which project through the slots in said legs and are anchored in the opposite sides oi the housing and serve to maintain said support arms in any adjusted position when the

Wing nuts

28, 28 are applied thereto and screwed home.

Liquid hose lines 29 and 29' are also connected to hollow bosses on the butt end of the gun the same serving to supply liquid under suicient head to fill the conduits 30 and 36' and to prime the gear pump chambers I5. Needle valves 3l, 3l serve to regulate the flow of liquid to the gear pump chambers and such regulation is further controlled by a by-pass conduit 32 associated with each gear pump chamber which is controlled by a cock 33. Each bly-pass, while controlling di-1 rectly the amount 'of liquid flowing to each gear pump chamber, necessarily controls the amount of liquid passing from its associated gear pump chamber to the communicating

conduit

34 or 34 which affords communication between such gear pump chamber and the nozzle of the gun.

The invention is especially suitable for use wherever the exact metering of one or more liquids is required and is free from the annoyance 3 caused by stoppage of ilow of the mixed liquids or a single liquid where dependance is had solely upon gravity for eecting such flow or where suction is relied upon to eiect the same and air bubbles enter the system and which stoppage foften results in spoilage of important work. The :invention is Valso especially applicable for use in 'fthe spraying of mixed liquids in those cases Where tit is essential that the same be mixed in exact proportions at the nozzle, as for example in spraying of a silver solution and a precipitant in the jproduction of high grade mirrors or reiiectors, :.since once adjusted my improved spray gun 4steadily delivers the mixed solutions in metered amounts Without the possibility of any interference of such delivery or the proportioning of the mixed liquids by air bubbles entering the system or by variations in ilow where reliance is had upon gravity. Furthermore, the possibility of the nozizle becoming clogged is minimized especially since nozzles having relatively minute orifices such as used in the atomizer type of vspray gun are not required in many'ofV the applications for which the invention is adapted, though if the character of the Work requires such small nozzle apertures the same may of course be employed.

Various modifications of the construction herein described may be made without departing from the spirit of the invention Vas embraced within the scope'of the appended claims.

Having thus described the invention, what claim is: Y A y 1. In a liquid dispensing device, the combination comprising a housing, a nozzle member associated therewith, a'plurality of gear pumps for tion comprising a housing having a plurality of inlet conduits and a common discharge outlet, a fluid-drive motor, including a rotor element, said motor having a pair of retractible, elastically mounted blades, interposed in one of said inlet conduits, a train of at least three gears operatively connected to said rotor, the middle gear of said i, ried by Said housing and directly controlled by one of the said latter fluids for proportioning with respect to each other the amounts of the dilerent fluids delivered from said housing to said spray nozzle. Y,

4. In a devicefor metering liquid to be mixed the sub-combination comprising a fluid-drive motor having a rotor element, a, pair of auxiliary gear pumps, and means including a separate train of variable gears interconnecting the rotor of the motor with one gear of each gear pump for metering the amounts of liquid discharged by each of said gear pumps in response to the speed of rotation of the rotor. Y y Y RONALD B SMI'II-I.

` REFERENCES CITED The following references iile of this patent:

UNITED STATES PATENTS are of record in the Mason 1 1 Aug. 29, 1944