US2249191A - Spraying apparatus - Google Patents

Description

P. J. TIMBERLAKE SPRAYING APPARATUS Filed Dec. l5, 1937 July 15, 1941.

flitomwai 3 FAL/L. J 'MEERLAKE lll l/I Patented July 15, 1941 sIieAviINcfirlalarrUsV Y Paul J. Tim'b'ferlake, Jackson; Mich. Application December 1s, 1937,'.seria1No.'1795467y j? s claires. V(014299-188) The present invention' relates to aisprayng andhot-air drying device which has particular application in the servicing of automotive'vehicle transmissionl and differential casings, but which also hasv general application including the'apply- Aing of certain coating materials anddrying them.

An object of the invention is to provide adevice for'heating airunder pressure and utilizing the heated air to heat-oilor a coating material, and at the same time to draw the oil or-coating material from a container.

Another object of I theinvention is-toprovide a -device having a nozzle-from'which-:atfwill' may .be directed -hot air or a sprayed-liquid.v -1' w Astill further object'. of the invention is to provide a. combined .spraying-andhot' air blowing -device having a nozzleprovidedwith structure toprevent under predetermined'conditions its .removal'from the fillingopening of a` transmis- A.sion or.diierential casing or other opening into which ithas .beeninserted` yThese and other` objects -will beapparent from the. following specification when-takenwith the accompanying drawing, in fwhich: Fig. lis a partial vertical section Fig. 2 is an enlargedview of Aa valve, Fig.3 is anelevation of a retaining hooi; associatedwth the sprayingtip, y

Fig. 4 .isan elevationcf a safetyvscreen -disposed in. the air .gun-adjacent the outlet thereof, Fig. 5 ,is a verticalsection of an alternative .structure for securing. theY mezz-lesto theair gun,

LFig. 6 isa section of a form of nozzle arranged `for quick cleaning.

Referring particularly to the drawing, reference character .I .indicates anair .gunVV suchasris describedin my co-pending application VSerial No.

105,917, led October.16,.1936. ,Theairvgun comprises end frames .2 -and .3, .between which -is mounted an electric heating elementJIA connected `to an electric powerline and-,surroundedbyfa heat insulating casing B and anv expanded metal guard '.I. VCompressedair is admitted tothe lgun from a ,suitable source through attingA 8. con- "trolled by a shut-off 4valve 9. .As.in. myV aforesaid cof-pendingy application, .the ,compressedf..-.air

passes `into .the interiorpf the gunipast the-inlet end of the heating element .4. andis heated. The heated air is discharged past. the outlet end .ofY the heating Velement tv intoa .threadedfpassage- I0 in the end frame 2 at theoutletendof thegun.

.The aforesaid structure Ais .substantially nthe "same as that. of my `above mentionedy co-,pending vof thestructure comprising the invention,

application. "The present invention'l comprises the combination withrsaid air gun of the heating and spraying device to' be described, as well as the particular structure and features of the heating and Vspraying* device. v

'A nozzle 'I5 comprising a suitable tube is threadedat one end to the end frame 2 and at the other end has' threaded thereto a spraying tip 16. The nozzle' I5rhas connected thereto a tube` I'I `which passes through the wall ofthe nozzle SI5 and extends inside thereof tolejeicting relationshipv with the tip I6. 'The interior bore of` the spraying tip I6 and the end of thetube I'I `associated therewithv are provided with'tapers I8 f'and I9,' respectively, Aso' that as the tip I6 is .adjusted .axially with respect to the nozzle 'SI5 ,theA characteristics of :thevspray which is pro'- :ducedare varied.

'.The tubellisconnected through'a valvef20 .to-a small container v2 I,"thefcontaine'r'2l in'actual ypracticev :having a" capacity of one fpint, more or: less, although it' is to'` be understood that the "S'me' "of the container 2I..'is'not a limiting feature ,Y ofther'invention. The container 2|' is'en'closed at its rear end with a concave plate' 22,-at the mid-:portion "of which'. is threaded a Drilling plug E23. "The 'con'cavityxof the .plate "22fis="fori the fpurpose of facilitatingthe lling ofthe container 2 #when the 'same wup-ended. A tube 24 within Mthe container- 2 I communicates withthe-.valvef20 f Vand projects tol the-lower rearfportionfof `ith'e -container '2 I in order .that yliquid ytherein Mmaybe ;as-1completely used up as possible. j i' 'The='valve20has provided 'inthe body thereof a'passageZS-ffor conducting :liquid from the conjtainer- 2 I the passageZ-Stbeingin alignment with hapert-30' in the valve.- member 3 I- of the fvalve 1 .-Ihe-functionfof .the passage 32` and theport-33 4 as liquid is withdrawn-therefrom. The 'val-ve I2i) nis lcontrolledfbyazthumb piece 34,- andits move- .mentis Vlimited by ja pin :i5-'movable with theA valve member. 3I thereof. in fra slot 36 -in the. valve v.bodyspring'lv isemployedJtomaintaiIr-the ,valve member v3 IY seatedin Zri-Ii the` -usual manner; :It V1will be understood .thatfinoperation the rotating-ofthe valve=mem ,ber..3.I 1by-.the-thumb pieceivlhivill` simultaneously .Y open Aorf-close thepassages A of` liquidV and'air, respectively.

A .f The nozzle I5 isV provided adjacent'- the outer j end .thereof ...withal relatively fixed ange 40 z and port '33 -inftheevalvewmember 43I of A the Vvalvelll.

the body of th'eyalvel has slidable thereon between the flange 40 and the tip I6 a rounded seat 4I. A spring 42 is disposed on the nozzle I between the flange 46 and the seat 4| to urge the seat 4I toward the tip I6.

Associated with the tip I6 is a hook 43 which, as shown particularly in Figs. 1 and 3, comprises a at washer like plate 44 having a threaded internal opening 45 and an extended side 46, the end of which is turned over to provide the hook 43. The hook 43 is disposed between the seat 4I and the tip I6 and is threaded on the outer end of the nozzle I5 to abutting relation with the tip I6.

At the inner side of the end frame 2 is disposed a metallic screen 41 to prevent the flame of any oil or other vapors which may have ignited, either within or without the interior of the hot air gun I, from passing outwardly 'orA inwardly with respect to the interior of the hot air gun I. The screen 41 is generally semi-spherical in shape and is secured to a bushing 48 provided with a seat 49. The interior of the bushing 48 is preferably hexagonal inV cross-section, and the exterior is threaded to threadably engage the threaded passage I9. 'I'he bushing 48, after being manually threaded into the threaded passage III, may be taken up, by means of an internally acting wrench, to urge the seat 49 against the interior face of the end frame 2 to secure the bushing 48, and thus the screen 41, in position.

The container 2|, while somewhatsupported by the tube I1, is additionally supported by a bracket 55 which is in the form of a metallic band which is clamped by means of a bolt 56 about the container 2|. The bracket 55 has an extension 51, which is flared out and provided with an opening through which the nozzle I5 is passed. The extension 51 is disposed on the nozzle I5 between the movable nut 58 and the nut 59 xed with respect to the end frame 2. Thusafter the nozzle I 5 has been threaded into the threaded passage I6, takingup on the nut 58 not only clamps the bracket 55 to the hot air gun I but also locks the nozzle I5 in the threaded passage Il).

In Fig. 5 is disclosed an alternativeform of connection between the nozzle I5 and the end frame 2. In this form there is threaded into the threaded passageJIIl a sleeve 65 having an outwardly extending portion 66 provided with bayonet slots 69. The inner end of the nozzle I5 is provided with an enlarged extension 68 provided with pins 61, Aby means of whichin cooperation with-the slots 69 the nozzle I5 is secured to the end frame 2. container 2| is provided with a clamping ring 1I which is clamped to the extension 68 by a bolt 12. The nozzle I5 is assembled on the tubular extension 66 by loosely fittingthe bracket 55 on the container 2| and the clamping ring 'II over the nozzle I5 and turning the pinsY 61 into the slots 69. The bolts 56 and 12 are then tightened to provide a rigid Support for the container 2|.

The foregoing structure, while primarily designed for cleaning and flushing transmission and differential casings ofautomotivevehicles, may be used for a variety of purposes. In its use for servicing transmission and differential casings, the tip I6 and the hook 43 are disposed within the filling opening of the casing to be serviced, the hook 43 being manipulated to engage a portion of the inner surface of the casing. The seat 4| bears against the outer edge of the opening and is yieldably urged thereagainst by the spring 42, the hook 43 opposing the action of The bracket `55 supporting the the spring 42. The valve 20 is closed at the start of the servicing operation to close off the communication with the container 2|, which has previously been filled with any suitable grade of iiushing oil or the like. The heater is turned on, and compressed air is admitted by opening the valve 9. Hot air is then projected into the interior of the casing, its escape through the lling opening being prevented by the seat 4|. By manipulating the nozzle I5 through the air gun handle 10, hot air may be directed against different portions of the interior of the casing to soften and loosen heavy grease therein. The valve 20 is then opened. Oil from within the container 2| is drawn through the tubing I1 by the ejecting action of the air passing through the tip I6 and is sprayed by the tip I6 into the interior of the casing. As the oil from the container 2| passes through the portion of the tube I1 within the nozzle I5, the hot air heats the oil so that an oil spray of high temperature is provided. The nozzle I5 may be appropriately manipulated to direct the spray against different interior surfaces of the casing. After the flushing with the hot spray has been completed, the valve 20 is closed and a blast of hot dry air is directed intovthe interior of the casing to dry the same. The servicing is then completed, and the tip I6 and hook 43 are withdrawnvv from the filling opening.

The present invention also has particular utility in applying coating materials which must be applied either hot or cold and which can be dried expeditiously with heat. In applying a coating material, the container 2| is filled with the coating material and is sprayed in the manner herelnbefore described by opening the valve 20- and compressed air valve 9, either with or -without heat, as the specific coating material requires. The valve 20 is then closed and hot air applied to dry the coating after it has been applied.

It will be clear that, in the use of the foregoing structure, when different materials are used a separate nozzle I5 and container 2| assembly may be employed for each material used. Thus onek assembly would be used for flushing oil, another assembly for blue lacquer, etc.

In Fig. 6 is disclosed an alternative form of nozzle and tip arrangement for use particularly when a coating material is used. Coating materials have a tendency to build up on the'inside of the tip, thereby hindering the spraying' operation. The nozzle I5 is provided with a threaded portion 13 adjacent the end thereof and at the end thereof is provided with a cylindrical portion 14, about which telescopically ts a.tip.15. .The tip 15 abuts against a washer-like member 16, threaded to the portion 13, which determines the relative axial position of the tip 15v with respect to the tapered end lspoftheiube|1-f1t win be clear that by movement o f the washer-like member 16 along Ythe threaded portion 13, the ad- Justrnent of the tip 15 with respect to the tapered end I9 of the tube I1 may be changed. Secured to the tip 15 are oppositely projecting trunnions 11, to which are pivoted links 18. rIhe links normally urge the tip 15 against the washer-like member 16, but when it isV desired to clean the interior of the tip 15 the links 18 are moved downwardly to disengage the tip 15 from relation with the tapered end I9 of the tube I1. lAir blowing through the nozzle I5 will then dislodge any Ycoating material adhered to the interior of the tip 15 and clean the same. By actuating the links 18 to move the tip '15 back against the washer-like member 16, the tip and nozzle assembly are placed in condition for use again.

Having thus described my invention, what I desire to secure by Letters Patent and claim is:

1. A device of the character described comprising a hot air gun having a nozzle, a spraying tip on the outer end of said nozzle, a tube within a portion of said nozzle and communicating with said tip in ejecting relation thereto, a source oi liquid communicating with said tube, means to connect a source of compressed air to said gun, whereby said air, heated in said gun, draws said liquid into said tube, heats said liquid in said tube and sprays the same from said tip, a spring pressed sealing member associated with said tip and a hook associated with said tip, whereby when said tip is disposed through an opening in a casing said hook may be made to engage the inner wall thereof to prevent outward movement of said tip, and said sealing member engages with the outer wall thereof.

2. A device of the character described comprising a hot air gun having a nozzle, a spraying tip having a connection to the outer end of said nozzle, a tube within a portion of said nozzle and communicating with said tip in ejecting relation thereto, a source of liquid communicating with said tube, said source comprising a closed portable container supported from said gun, means to connect a source of compressed air to said gun, whereby said air, heated in said gun, draws said liquid into said tube, heats said liquid in said tube and spraysthe same from said tip, and a Valve to control the flow of liquid from said source, said valve having a passage for the outlet of liquid and a separate passage for the inlet of air to said container.

3. A device of the character described, comprising a hot air gun having a detachable nozzle, a spraying tip on the outer end of said nozzle, a source of liquid, said source comprising a portable container, a uid connection from said source to said tip in ejecting relation thereto, means to connect a source of compressed air to said gun, whereby said air heated in said gun draws liquid into said tube and sprays the same from said tip, means to transfer heat from said hot air to said liquid, a valve to control the flow of liquid from said source, and means to support said `container from said gun, said means comprising a bracket secured to said container and clamped between said nozzle and said gun.

4. A device of the character described for directing a spray through a restricted opening into a chamber, comprising a spraying tip, a spring pressed sealing member concentric with and axially slidable along the axis of said tip, yand a hook xedly supported upon said tip, said hook being adapted to be disposed through said restricted opening into said chamber and to bear against the interior of said chamber, and said sealing member being adapted to yieldably bear 3 against the outside of said chamber to seal said restricted opening, the reaction to said spring pressed sealing member being resistedby said 5. A portable combination hot air and liquid spraying gun comprising an air heating chamber, an elongated conduit connected to said chamber at one end and having a nozzle at the K other end, `a tube for conducting liquid to said nozzle, said tube being housed for a portion oi its length in said conduit in heat exchanging relation and having a tip portion adjacent said nozzle so located asrto be in a zone of reduced pressure when hot air is passed through said conduit, a liquid container supported in unitary relation with said chamber, but exteriorly of said chamber and conduit with which said tube connects, and means to connect said chamber to a source of compressed air whereby said air, heated in said chamber, draws said liquid into said tube, heats the liquid in said tube and sprays the same from said tip through said nozzle.

6. A compact portable combination hot air and liquid spraying gun having a heating chamber, a pistol grip connected exteriorly of said chamber with a substantial portion of said chamber projecting forwardly of said grip, a threaded outlet opening at the outer end of said chamber, a Vremovable nozzle threadedly supported in said opening, a tank -for spraying liquids supported from said nozzle and constituting a unitary part thereof, vsaid tank with the nozzle in position overlapping that portion of said chamber for` wardly of the pistol grip, said tank being sufri- Vciently spaced from a portion of said nozzleV threaded into said opening as to clear said chamber when the nozzle isv secured to the chamber by relative rotation between the nozzle and chamber, and conduit means for conveying liquid from said tank to said nozzle. f

'7. A removable spraying nozzle assembly for hot air guns comprising an elongated conduit portion for connection with a hot air chamber of an air gun, a tube for the spraying liquid having a portion of its length housed in said conduit portion in heat exchange relation, one end of said tube having a spraying tip adjacent the end of said nozzle, a tank for the sprayingliquid unitarily associated with said conduit portion, the other end of said tube being connected to said tank. Y

8. A removable spraying nozzle adapted to be threaded linto the barrel of a hot air gun comprising a nozzle portion, a tank, bracket means extending between the threaded end of said nozzle and the tank to position said tank rearwardly of the threaded portions of said nozzle suiiiciently to one side of the axis thereof to enable the tank to clear the barrel of the gun at the time the nozzle is threaded into position, and conduit means between the tank and nozzle.

PAUL J. TIMBERLAKE.

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