US1878435A - Paint spraying appliance - Google Patents

Description

Sept. 20, 1932. s, BRAMSEN ET AL PAINT SPRAYING APPLANCE Filed May 51, 1930 Patented Sept. 20, 1932 UNITED STATES PATENTQFFTCE .f

SVEND BRAMSEN AND FRITZ WAI-ILIN, OF CI-IICAGO, ILLINOIS, ASASIGNORS TO BINKS MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORFORATION GF DELA- WARE iAIivr srRAYiNe APPLIANCE Application led May 31, 1930. Serial No. 458,836.` i

Our invention relates to the class of spray appliances in which a stream of compressed air isprojected past the outlet of a liquid r.supply tube leading from a container on which the air-projecting part of the appliance is mounted, so that the air stream sucks liquid material out of the liquid supply tube and atomizes this liquid.

Generally speaking, the objects of our inld vention are the providing of an exceedingly light, inexpensive and easily manufactured spray appliance of this class, and one in which no air valve or other accurately machined mechanism is required for controlling the 15am-Y- More particularly, our invention aims to provide a spray appliance of this class, in which the volume and distri-butionof the spray can be regulated by adjusting a liquid '25 outlet nozzle, and in which the spraying action is lcontrolled (without interrupting the flow of air through the air duct) by means of an air deiiector which is movable into and out of a position between the air outlet and fthe liquid outlet. Moreover, our invention aims to provide simple, inexpensive and' easily'operated mechanism whereby the user of the appliance can easily and conveniently f5 control the spraying action. ti

will appear frOm'the followingspeciiication and from the 'accompanying drawing, in which l Y.

Fig. 1 is al side elevation of a spray applit; ance embodying our invention, with a Vportion of the liquid container broken away,

showing the parts as they are disposed when the spraying is discontinued. i v Fig. 2 is a fragmentary view, similar to a 1 1 portion of Fig. 1 but with some parts in section, showing the positions of the air deiiector and the deflector-moving mechanism'as they appear during the spraying action. y Fig. 3 is a fragmentary plan view of the 45 cap of the liquidcontainer and of parts disposed above this cap. Fig. 4 is a fragmentary side elevation, partly inV section, showing a simplified form 4of air deflector and defiector-moving mechanism also embodying our invention.

Still further and also more detailed objects' In the embodiment of Fig. 1, the materialv container consists of a jar 1 and a cap 2' threaded upon the mouth of the jar. `Seated on the top of the cap 2, and clamped to the cap by a screw 3, is the foot l ofa leg 5 which depends from the barrel or air tube 6v of pistol-shaped spray gun body. This body (which desirably is acasting made ofa light metal,I such as aluminum) also includes a handle 7 depending from a more rearward portion of the barrel or airtube 6, andthe barrel has anginlet portion or attaching nipple 6A, projecting rearwardly beyond the upper end of the handle, which projection desirably is corrugated (as shown in Fig. 1) to facilitate the tight attaching of the hose 8 through which compressed air is V.supplied to the air'tube. Thus arranged, the foot land the leg 5 form the base member for supporting the entire spray gun body (including the air tube, theattaching nipple and the handle) ,which .body can be an integral castingas for example, of aluminum or an aluminum alloy.

The air tube preferably extends forwardly beyond the leg 5 and has its forward end tapering forwardly, and the outlet portion O of the yair tube (which outlet portion opens e through this forward end of the tube) is con- Y siderably smaller than the main portion B of l i the bore of the air tube, so as "to accelerate ,the

velocityof-theissuing stream of air. 1

Extending, slidably downwardly through the foot 4 of the gun body and the cap 2r is a liquid supply tube 9'which depends into 'theliquid in that jar. f This liquid tube also extends through a packing disk 10 which is clamped against the lower face of the cap top by a screw Sand which effectively seals the Vtube to the cap in additionto affording the' usual-seal betweenl the cap and the mouth end of the ar.V

' Threaded penale upper end efneeiiqiidv tube is a liquid nozzle 11, which has anupwardly tapering bore and which presents its tip endsomewhat below the axis MvA 'of dis- Interposed y between the bottom of the liquid nozzle lland. the foot-is a compression spring 12 which charge bore O of the airtube.

serves the double purpose of latching the nozzle against rotation on the tube, and of lifting the nozzle and the liquid tube to a position in which the bottom of the packing 10 is engaged by a stop collar 13 soldered to the tube.`

Extending horizontally through the air tube, behind the tapering tip of this tube and above the tube axisA, is a pivot pin 14, which pin'has its axis in a plane at right angles to the common vertical plane of the air tube axis A and the liquid nozzle axis N.. Pivoted upon and the outlet tip of the air duct, thereby permitting the air deector to be moved into and out of positions in which it will intercept and deiiect the air issuing from the air tube, so

that this air cannot pass close to the upper or discharge end of the liquid nozzle.

For moving the air deflector,Figs. 1 and 2 show a bar 16 extending slidably below the air tube through the leg 5 and into a bore 17 in the upper portion of the handle. The forward end of this sliding bar 16`has a horizontal pin 18 extending through the bar, and each end portion of this pin is disposed in a slot 19 formed in the lower end of one of the sides 16 of the delector member, each such slot being elongated radially of the axis of they pivot pin "14. A compression spring 20 disposed between the rear end of the sliding bar 16 and the rear end of the bore 17 continually urges this bar forwardly until stopped bythe engagement of the rear face of the leg 5 with the forward lend of a finger-piece 21 which is fastened to the sliding bar by a cross-pinVv 22. This finger-piece depends below the airk tube and between the liquid container vand the handle 7 so as to be easily reached and manipulated by a finger of a hand grasping the handle. v o Vhe'n the sliding bar is not digitally retracted, the spring 2O retains it in the position shown in 1, thus holding the air deflectorV member in a position in which the air deflector 15 extends in front of the air outlet O. Consequently, compressed air supplied by the hose 8 and passing through the air tube will be deflected upwardly and at such a distance from the tip of the liquid nozzle 11 as to exert no ,suction eect for drawing `liquid upv thel liquid tube.

However, when the sliding bar is retracted,

, as shown in Fig. 2, the air deflector is swung entirely below the outlet ofy the air tube, so that vtlie'issuing air blows across the tip of the' liquid nozzle, thereby sucking liquid out of'thejar'l through the liquidtube 9 and the said nozzle, so that this-liquid issues from the tip of the nozzle and is atomized into a spray by the stream of air issuing from the air tube.

vWith the parts in this disposition, the total volume, density and spread of the spray can be varied to a considerable extent by merely rotating the liquid nozzle 11, so as to vary the distance between its tip andthe axis A of the air tube. lVhenever the spraying is to be interrupted or discontinued, the operator merely releases his rearwardpressure on the iingerpiece; whereupon the spring 2O slides the bar '16 forward and returns the air deflector to the position shown in Fig. 1, in which this deflector diverts the air upwardly and out of operative eect on the liquid nozzle and the liquid tube.

To allow the liquid to be sucked out of the jar, the cap 2 is provided with a suitable air vent, such as the perforation 23 in Fig. 3, thereby allowing the pressure of the Outer air to press down on the liquid in the jar` so as to force the liquid up the tube 9y and out of the liquid nozzle 11.

l/Vhenthe spring is pushing the slide bar 1G forwardly, the air deflector 15 swings (in a clockwise direction inv Figs. 1 and so that its upper edge moves upwardly in front of the tip of the air duct, thereby swinging the air blast upwardly. A As the result of this? upward tilting or swinging movement of the air blast, the lower edge of the issuing air stream still strikes the tip of the liquid nozzle after the major portion of the airv has been deflected suihciently to annul its sucking action, thereby blowing oi'f any petty drop of liquid which otherwisefmight be held in the tip of the liquid nozzle by capillary action.

Consequently, we avoid the clogging of this nozzle by having paintor the like dry in its vtiivo By using a straight bore for the airtube.

and eliminating the need of an air valve, we also obviate a clogging of the air outlet by dust in the air, iny addition to avoiding the need of accuratelymachinedvalve parts. And,

since the extending of the liquid tube through the cap of the container prevents the body of the spray gun fromrotating about the screw 3, this single screw suffices for securing the spray gun to the container. Moreover, the liquid tube can readily be separated from the cap when the nozzle 11 is unscrewed, so that Vthe user easily has access to all parts for iiispecting and cleaning them.

However,r while we have heretofore described ourv invention in an embodiment including a sliding member for moving the air deflector in one direction, we do not wish to be limited to this or other details of the construction and arrangement thus described, since many changes might be made without departing either from the spirit of my invention or from the appended claims.

For example, Fig.'4 shows a portion of an IBL embodiment of' our invention' in which the air deflector is integral with the actuating member, and in which no sliding member is required. In this embodiment,y the actuating member is a lever 24 pivoted intermediate of itslengthon a horizontal pin 25 extending through a riser lug 26 formed onv the air tube V6 at a short distance fromthe tapering tip of this tube, and this lever (which can be punched out of sheet metal) has its forward end bent downward to form an air deflector 27. A compression spring 28 is interposed between the air tube 6 and the lever 24 rearwardly of the pivot pin 25 and continuously tends to swing the forward lever arm downwardly, so as to have the air deflector 27`extend across the axis A of the air tube. But the swinging of the lever in this direction is limited by a screw 28 which is threaded through the forward l-ever arm and has its lower end disposed for engagingthe top of the air tube. With this embodiment, a downward pressure on the rear lever arm (as by the finger 29) will rock the lever so as to raise the air deflector out Vof the path of the air projected from the air tube, and the spring will automatically return the combined air deflector and actuating member to the screwstopped position when the pressure of the finger is discontinued.

l/Vith each of the illustratedl embodiments,

the axes of the liquid nozzle and of the discharge passage O of the air tube should be in a common vertical plane, such as the plane P in Fig. 8, to insure symmetry in the resulting spray. However, no great accuracy of manufacture is otherwise required for either embodiment. Moreover, it will be obvious that an exceedingly small amount of machining is required for our entirely valveless spray appliance, that the assembling is quite simple; and that the entire spray gun portion can be much lighter than that of types which include interior valves and valve-actuating mechanisms. i

Y We claim as our invention:

1. Ina spraying appliance, a container for liquid, a body member including a base seated on the container, a riser on the base, an air tube extending across the top of the riser,

Y and a handle depending from the rear end of the air tube, the air tube having its outlet above the said base; a liquid tube extending upwardly through the top of the container and the base, and having its outlet disposed forwardly of the loutlet of the air tube, the axes of both outlets being in a common vertical plane and the upper end of the outlet of the liquid tube outlet being below the axis -of the air tube; an air deflector pivoted to a forward portion of the air tube on a horizon- Y tal axis transverse of the axis of the air tube,

the air deiiectcr having a portion thereof adapted to extend across the mouth of the Lair tube whenthe airdeflector is in one posiliquid, a body member including a base seat ed on the container, a riser on the base, an

air tube extending approximately horizontally across the top of the riser, and a handle depending from the rear end of the air tube, the air tube having its outlet above the said base; a liquid tube extending upwardly through the top of the container and the base, and havingits outlet disposed forwardly of the outlet of the air tube, the axes of both outlets being in a common vertical plane and the upper end of the liquid tube outlet being below the axis of the air tube; an air deflector pivoted to a forward portion of the air tube on a horizontal axis transverse of the axis of the air tube,.the deflector having a portionV thereof adapted toV extend across the mouth l of the air tube when-the said deflector is in one position; a slide extending through the riser below the air tube and connected to the air defl-ector; spring means interposed between the slide and aportion of the body member for continually urging the slide in a direction in which the slide causes the deflector to be in the aforesaid position; and a combined stop and trigger element fast upon the slide behind the riser and forwardly of the handle, the said element including a. depending trigger and shouldered portion forwardlyof the trigger and disposed for engaging the riser when the` slide issuiiiciently moved by the spring in thefirst named direction to dispose the'air deflector in its said position. y

A 3. Ina spraying appliance, a container-for liquid, a riser tube depending into and extending above the container andhavinga contracted liquid outlet at its upper end; an air tube extending transversely of the said riser tube above the container and having a contracted air outlet disposed adjacent to the said liquid outlet, with the axis ofthe air outlet above the liquid outlet; an 'imperforate air deflector pivoted upon the air tube and movable into and out of a position in which the said deflector extends between the said two outlets, the air deflector being formed for upwardly deiiecting air issuing from the said air outlet.

posed between the two outlets.

5. In a spraying appliance, a container for liquid, a'riser tube depending into and extending above the container and having a4 contracted liquid outlet at its upper end; an

air tube extending transversely of the said tube above the container and having a con-l tracted air outlet disposed adjacent to the said outlet and with the axis of the air outlet above the liquid outlet; an airdelector pivoted to the air tube and movable into and out of a position in which a portion of the air deiiector is disposed between the two outlets, a` retracting member slidably supported below the air tube and connected to the air deflector for moving the air deflector in one direction, 'and spring means opposing such movement of the retracting member.

6. In a spraying appliance, a base member,

a liquid tube and an air tube'supported by the base member with the axes of the two' tubes relatively transverse, and with the outlets of the two ducts so disposed that air issuing from the air tube will blow across the outlet of the liquid duct to produce suctionin the liquid tube towards the outlet of that tube; and an upwardly open scoop-shaped air deiiector having its sides extending at opposite sides'of the air' tube and Shaving the upper ends of its sides conjointly pivoted to the air tube, the deflector being movable into and out of a position in which its back ex-` tends across the axis of the air tube.

7. In a spraying appliance, a container for liquid, a bodyy member including a base seated on the container, a riser on the base, an air 'tube' extending approximately horizontally across the top of the riser, and a handle depending from the rearend of the air tube, the air tube having its outlet above the said base; a liquid tube extending upwardly through the top of the container andthe base, and having its outlet disposed forwardly of the outlet of the air tube, the axesvof both outlets being in a common vertical plane and the upper end of the liquid duct outlet being slightly below the axis of the air tube; an air deflector pivoted to a forward portion of the air tube on a horizontal axis transverse of vthe axis of the air tube, the deflector having avportion thereof adapted to extend acrossf the axis of the air tube when the said deflector ati is in oneposition; andan actuating member Y extending slidably through the riser and into e the handle and connected to the air'deflector. 8. A spraying appliance as per claim 7, incombination with spring means interposed between the actuating member and the handle for continuouslyurging the actuating member in the direction in which the latter causes the deflector to extend across the axis of the air tube. V Y

9. A spraying appliance as per claim 7, in combination with spring means -interposed between the actuating member and the handle for continuously urging the actuating les

Images