US2739843A - Spray coating means - Google Patents

Description

March 27, 1956 J w BAUR 2,739,843

SPRAY COATING MEANS Filed NOV. 16, 1951 2 Sheets-Sheet l March 27, 1956 J. w. BAUR SPRAY comma MEANS 2 Sheets-Sheet 2 Filed Nov. 16, 1951 United States Patent SPRAY COATING MEANS John W. Baur, Glenview, 111., assignor to Binks Manufactoring Company, Chicago, 111., a corporation of Delaware Application November 16, 1951, Serial No. 256,697 2 Claims. (Cl. 299-1401) The present invention relates to spraying devices for spraying coating materials, especially such materials as are non-premixable for coating.

There are some coating materials or substances, such as an enamel, or like type of coating material, which when sprayed or applied,has or needs a rapid curing, and it has been found that it may be effected, as by way of example, by the use of a substance generally known as a catalyst, or the like, which acts rapidly and helps a rapid and efiicient coating.

The present invention relates to a coating means or spraying device for spraying a coating material, for example such as an enamel type of coating material, or the like, as referred to above, and more particularly the means for projecting with or in such spray of coating material, the curing or like material, such as a catalyst as ientioned above, whereby the two mix or become associated or unite and react together during the spraying action or process so as to be in proper condition for coating or effecting a coating of the surface being or to be coated.

The present invention may be regarded as an improvement on the invention disclosed in the co-pending application of I. O. Johansson, Ser. No. 226,257, filed May 14, 1951, on Spray Coating Means And Method, now forfeited.

Other objects, advantages, capabilities, features, and the like are comprehended by the invention as will later appear, or as are inherently possessed by the invention.

Referring briefly to the drawings:

Fig. l is a part vertical sectional view and part elevational view of a spray gun employing or embodying the invention;

Fig. 2 is a part top view partly in section and partly in elevation of a part of a spray gun and of the associated improvement of the present invention;

Fig. 3 is a top plan view of the same; and

Fig. 4 is a fragmentary side view of a part of the improvement.

Referring now more in detail to the drawings, the embodiment selected to illustrate the invention is shown as comprising a spray gun 11 having a body portion 11, a head portion 12, a nozzle portion 13 connected to the head portion 12 by a suitable coupling means or the like 14, and a handle portion 15.

On the body portion 11 is pivotally mounted by way of suitable pivot means 16 a hand operated control means or trigger 17 or the like. The handle 15 preferably has an air entry passage 18 leading to a valved chamber 19 having a valve 20 for controlling the passage of air to the forward part or chamber portion 21 of the chamber 19 and which part 21 has a passage or passages 22, 23, leading to an air passage or chamber 24 leading to a passage or chamber 25, and a further passage 26 which in turn leads to the air chamber or passage 27 provided in the upper part of the body 11, as shown in Fig. 1.

The valve 20 is normally held closed by a spring 28 and this valve has a valve stem 29 slidable in the forward part or portion of the chamber portion 21 and the forward part of such valve stem 29 being in operative engagement with a contact piece 30 carried by the hand operated trigger 17, when pulled back by the hand of the operator moves the rod 29 and opens the valve 20 to permit passage of air under pressure to pass by way of the passages 21, 22, 23, 24, 25, 26 to the passage or chamber 27.

The air then passes from the air passage or chamber 27 to a passage or chamber 31 provided in a connecting piece or coupling member 32 between the body portion 11 and the head portion 12 of the gun 10. This passage or chamber 31 leads to a chamber 33 provided in the head portion 12.

Within the nozzle portion 13 and in the forward portion of the head portion 12 is located a material and air passage member 34 having a forward contacting member or portion 35 seated against the nozzle portion, 13, and a rearward contacting member or portion 36 with a portion or part 37 of the head portion 12. The head portion 12 has a material inlet part or portion 38 having a material passage 39 leading to a material chamber or passage 41) provided in the material and air passage member 34 above referred to, this passage 40 leading to a tapered forward portion or part 41 having a material projecting nozzle part or tip 42 extending in a central opening 43 provided in the front 44 of the nozzle part or portion 13, and the projecting of the coating material through said nozzle part 42 being controlled by a tapered valve part 45 carried at the forward end portion of a valve stem 46 extending rearwardly in the material chamber 41) and in the gun body portion 11 rearwardly of the hand trigger member 17, and also carrying a sleevelike member 47 slidable in the gun body 11 as shown in Fig. l, the sleeve-like member 47 having a head 48 at the 7 rear of the hand lever or trigger member 17 to be contacted by and moved rearwardly when the hand trigger member or means 17 is pulled back by the users or operators hand so as to likewise move the valve stem 46 rearwardly and hence the valve part 45 to cause it to open and to cause the coating material in the chamber 40 to be projected out as a liquid stream 49. (See Fig. 2.)

The member 34 has an intermediate portion 50 making sealing contact with nozzle portion 13 at its forward portion and with the head portion 12 at its rear portion, and has or is provided with air passages 51, 52, leading from the air chamber 33 by way of ducts 53, 54, respectively, and air ducts 51 leading to air chamber 55 provided in the nozzle portion 13, and air ducts 52 leading to the air chamber 56 in the front portion of the nozzle portion 13. The nozzle portion 13 also has air passages 59 (see Fig. 2) leading from the air chamber 55 to side ports or jet orifices 57, 58, for the projecting of side air jets or streams 1117, 106 for acting on the central or projected stream or streams 49 of material projected from the nozzle or tip 42. Thus, from the chamber 55 lead air passages 59 (see Fig. 2) for supplying the air to the side orifices 57, 58 (see Fig. 2). The ducts or air passages 52 lead to the chamber 56 which chamber has air projecting orifices 619, 60, 61, 61, and also an annular opening 62, for projecting air around or against the liquid stream 49 projected from the material nozzle 42. The air jets or streams 107, 106, projected from the side or horn ports 57, 58, and all the air projected from the orifices 60, 61, and also the air projected from the annular orifice 62 wiil unite as shown in Fig. 2 to engage and enshrond, so to speak, the main material or liquid stream 49.

The means for projecting or supplying the curing or substance, such as a catalyst or the like, and forming,

in the main, the subject matter of the present invention,,

is shown in particular in Figs. 2 and 3, and comprises a body portion 63 detachably supported by or in a sort of saddle like, member on thelikefid-having: anfextensiont or connectingrpart 65 carried by-or suitably attached tutor is: even an integralpart of the spray gun, especially the headiportion' or part 12 thereof, and this part or portion 63-has connected to it'at its forward portiona chamberedmember 66 as by suitable holding or securing means, such as-screw threads 67, and also has connected to it or at its rear portion a chambered member 63 as by suitable holding or securing, means, such as screw threads 69.

The member 66zhasa chamber 70 for holding the curing.

70, the body part 63which latter carries'a sort of sealing means 76 for the stem '75, and thence along and through a chamber 77 provided in the chamber 68, and through the rear end wall IS-of the chamber 68, where the stern passes freely thrcughan arm 79 fixed to the trigger arm 17, and the rear end of the stem 75 has athreaded portion 80 where are adjustably carried and set stops or the like 81', 82, so that when the hand lever or trigger means 17 and attached parts 79 are movedbacl; the arm 79 will move to contact the stop or stops 31, 82, to move'the valve stem 75 rearwardly and to cause the valve 7374 to open and permit flow of the curing substance from the chamber 70.

in the chamber 77 is provided a spring 83 which is normally in compressed condition between the rear end 78 of the chamber member 68, and a thrust flange or the like 84- provided on thetmovablevalve stem'75, whereby the spring 83 will normally hold the valve 74 closed; and return the valve 74 to closed position after release ofpressure on the hand trigger 17 and return of the latter with the arm 79;. stops 81, 82, valve stem 75, disc 84, and valve 74, under the influence of the spring 83.

At the forward cndofthe, member 66 is provided a chambered part 85 inwhich is provided a chamber 86 in communication with the valve port 73, and this chamber 86 has a lateral openingin which is provided a nozzle member 87 having a passage 88 communicating with chamber 86-andior projecting the curing fluid in a stream or the like 89 toward and into the stream of coating material from theorifi'cc 43and air-mixed with it from theports 60, 61, 622 and from the side ports 57, 53 to mix therewithand to be carried therewith and to effect the curing action by the time the mixture or the like reaches thesurface to be coated. The nozzle part 87 may be secured in place by suitable threads or the like 90. The body 63 of the projector may be held in place with the holding part 64-65 by any suitable securing or holding means 91.

In operation, when the hand trigger 17 is pulled back it first presses on the valve stem 29 to move it and the valve. 20'to open the latter and hencepermit a flow of air under-pressure by way of the passages and ports as follows: entry passage 18, chamber 19 via opened port of valve 20, to chamber portion 21 and thence via ports 22.to chamber 24 and then via passages 25, 26 to chamber 27 and thence through passage 3l tochamber 33 and to both sets ofairducts and passages 53, 54 and thencevia the ducts or passages 59, 59, in side horns 13, 13, and thence out through the side ports 57 57, 53, 58 to project air jetsior streams 106, 106, 1G7, 107 toward and to and into the air and'material being projected out the front part of the nozzle portion 13, andat the same time the'air is also'passin'g from the chamber 33"via the air duct'or chamber-'54; 54*thencevia the passages 52, S2, tothe- 4 chamber. 56,,and. thencethroughttheu orifices..61,- 61, 60,." 60, 62 provided in the front wall of the chamber 56 for projecting streams of air about and around the material stream 49 issuing from the central port 43 and to be engaged by and mingled with or joined with the streams 106, 106, 107, 107: projected from the side ports 57, 57, S8, 58, at about the same time but pref erably in retard'edf time the further movement of the hand trigger -17 causes the part in contact piece 30. to then engage. and' move: back from thehead 48- carried by the sleeve 47 which will cause a movementof the valve stem 46 to cause the material valve 45 to open the port oropening 43* to "allow the coating material to pass from the chamber 40 and-,be projected through the port 43 into a liquid stream 49 where it is engaged by the air streams from the orifices 62, 60, 60, 61, 61, to act with and mix or unite with such air streams, and to be impacted by theside streams- 106; 106; 107, 103 from the side'orifices 57, 57, 58'; 58; and'at about the same time movement of the hand'triggcr 17 will cause'the" attachedpart orarm 79 m movethe-stops 8'1, 82 on the valve stem i with the-thrust flange 84 against'the' spring 83 and'causean opening of thevalve 74to'p'ermit fiow' ofi the curing'fluid frotn the-chamber'70 viathe-valve' port 73 and-thenceto and through the nozzle passage 88- to be projectedin a stream89'to engage with and be engaged by the combined or combining streams of material from the nozzle Band to sounite with or be wassociatedwith said projected and'mixing material and air to mixorbecomesoassociatedtherewith as to effect the desired curing action on the' moving" coating material sothat asit arrives" at the-surface to becoated by itwill be insuchcured condition'as properly and elficiently eti'ectits coating action and result; As the'curingspray' is projected 'from its nozzle 87itwill becausedtotake' a curved patli'asshown at'89in Fig. 2 of'th'e'drawings so that the'curing'fluid-will movewith-andfin' generally the same direction of the coating material 49'arrd the engaginggair therewith; so that the curing eifect will take place during the transit of the combining sprays;

While I havedisclosed a'form of means "for supplying the curing fluid for'the coating material'as' disclosed, I do not want to be limited to the particular forrrr of means illustratedand described.

Having thus disclosed the invention, I claim:

1; In'a'spray coating apparatus of the character described, a body, a primary nozzle carried by saidbody havingapassage toproject a'stream of coating material,

a pair ofauxiliary air nozzles carried by said body on opposite sides of said primary nozzle and having passages to directstreams of air against'and in the general direction of "movementof said stream of coating material; and a second nozzle connectedto said bodyhavingla passage to direct'a"stream'oicuring' material againstsaid stream of"coating"material transversely thereof" to unite therewith, the projected axes of said passages converging outwardly towa'rd'andmerging at a commonpoint, trigger means carriedby said bbdy'for controlling theiinitiation' of how of saidstreamof coating material, andseparate' means connectedto said trigger means for simultaneously controllingtheinitiation offlow of saidistreamof curing. material with said coating material.

2. In a spray coating apparatus of the character de-. scribed; a body, a primary nozzle'carried by saidbody having a passage to project astream of coatingjmaterial,-

a valve stem positioned in said nozzle for controlling theilow of coating material from said primary nozzle;

a pairofauxiliary air'nozzles carried "by said, body on oppositesides-ofsaid primary nozzle and havingpassa'ges" to direct streams of air against and in the general direction of movement of "said stream of coating material, aseconrl" nozzle connected to said body having a passage to direct a stream of curing material against said stream ofcoating' material transverselythereofto unitetheteWith; the projected" axes of saidpassage converging outwardly'toward 5 6 and merging at a common point, a valve stem for con- References Cited in the file of this patent trolling the flow of curing material from said second UNITED STATES PATENTS nozzle, a trlgger plvotally mounted on sa1d body, means connecting said trigger to the valve stem of the primary 2,265,209 Thompson 1941 nozzle, and separate means connecting said trigger to the 5 2,304,857 m 1942 valve stem of the second nozzle to actuate both of said gzfig g vlv tm 'ult h d d. e

a e 3 e 5 51m aneously W en Sal g 18 move 2,559,407 Dalrymple a y 1951 2,626,122 Lammiman Jan. 20, 1953

Images