US1609465A - Tool for applying coating - Google Patents

Description

Dec. 7`, 1926. 1,609,465

H. DAY

TooL FOR APPLYING COATING Filed Apri-l l. 1922 2 Sheets-Sheet l wee., 7,1925. @$609,465

H. W. DAY

TQL FOR APPLYING CKOATING Filed April 1. 1922 2 sheets-sheet a y EMM M l/ww/ Patented Dec. l7, 19.26.

hannes HERBERT DAY, OF WOLLASTON. MASSACHUSETTS, ASSIGNOR T SPRAY PAINTING FINISHING EQUIPMENT SALES CO.,

A CURPOBATION OF MASSACHUSETTS.

TOOL FOR APPLYING COATING.

Application led April l.

This invention relates to tools or apparatus for applying coating to. surfaces and .-iii its prefei'red embodiment is an improvement upon the construction disclosed in my Patent No. 1,172,233, dated February-15, 1916, the said tool or apparatusdesirably functioning in accordance with the principles disclosed in said patent. l

The coating, if a liquid, may. be a paint, 1.0 japan, varnish or other suitable coating medium, or it may if desired be a solid in powdered form, and the material or surface to which it is to be applied may be of any character, such, for example, as Wood, metal or other material.

Referring more particularly to the drawings, wherein I have represented two embodiments `of my invention; y

Fig. 1 is 'a vertical central section .taken through the tool or apparatus;

' Fig. 2 is a front elevation of a part only of the apparatus shown in Fig. 1;

Fig. 3 is a view similar to Fig. 1 of another embodiment of my invention, and

26 wherein a container is attached to the body of the tool; and n Fig. 4 is a vertical section taken at right angles to the section line of Fig. 3' looking toward the left in said Fig. 3 and representan ing the vent; valves.

Referring first to that form of my invention shown in Fig. 1, the body of the tool is indicated at 1, the handle portion 2 being filesirably integrally formed with the body portion and having therein a longitudinal passage 3 for the paint or other coating material and a similar passage 4 for the air or other motive agent. The coating material and the motive agent are desirably supplied under pressure from some suitable source in a manner which need not be more particularly described and which may be substantially the same as disclosed in my Patent No. 1,321,014, dated November 4 The air or other motive agent entering the passage 4 is admitted into a valve chamber 5 here shown as extending transversely 'of the handle portion 2 and at an acute angle desirably integral 1922. Serial No. 548,696.

A to the axis thereof. Within said chamber 5 is threaded a bushing 6 having a valve seat 7 against which is adapted to be seated a valve 8 normally held closed by a suitable coil spring 9. The said valve is provided with a stem 10 extending through a packing 11 threaded into a suitable socket or'recess in the end of the bushing. The end of the valve Ystem 10 is threadedfas indicated at 12 to receive thereon the nut 13 and the yoke 14 which as indicated in dotted lines extend on both sides of the handleportion 2 to the .ing arm 16 for the attachment of other i o erating devices for controlling the operation of the tool at a distance. The bushing 6 is' provided with a transverse passage 18, which when the-valve 8 is opened admits the air or other motive agent into a chamber 19 which is in communication with a second chamber 20 forming a continuation thereof as clearly shown in Fig. 1.

Desirab-ly I provide means to heat the motive agent in its passage to the point of discharge. While any suitable means may be provide for this purposefI have herein represented an electrical resistance coil 21 which is seated in the chamber 19 and desirably closely fits the internal spiral flange` 22, by which the entering air or other motive agent is compelled to circulate about the coil on its way to the chamber 20. The said resistance coil is provided with two terminals 23. 24, which extend to a suitable pliigor bushing 25. The coil and bushing are held in place by a cap 26 threaded at 27 into -the end wall of the chamber 19. p y The body 1 is rovided with aa part 28 therewith and transversely extending with respect to the handle portion 1. The said part 28 is herein shown as provided with i a longitudinally extending passage. 29, here shown as of two diameters trollcd means for opening and receiving a correspondingly shaped valve member 30. Said valve member is received in the chamber 29 with sufficient looseness to admit the passage of the air or other motive agent about the frame and into va transversely extending through passage 31, itself communicating about midlength with the axial passage 32 that itself communicates with the open air at its forward or left hand end viewing Fig. 1, thereby permitting at the proper time the discharge ot' ci the air or other motive agent against the ilm like coating material in a manner fully disclosed in my said prior patent and not herein necessary more fully to refer to.

l Near its forward end the valve member 3() passes through and is supported by a plug or bushing 33, which is externally threaded as indicated at 34 into the part 28 ci the body, where the tissage 29 is of maximum diameter.. Desirably in vhe rear of the bushing 33 are provided a series of disk like washers or packing members 35.

rlhe part 28 is also provided with a. longitudinally extending passage 36 which at its forward end is in communication with the space 37 within the inner cap 33 shown as internally threaded at 39 onto the externally threaded part 28. The said cap 33 its forward end is provided with an axial opening 40 receiving the forward end of the valve member 30, the latter serving to close said opening when in the position shown in Fig. 1. l Outside the cap 38 is a cap internall threaded at 42 onto la ly thro-a closure for a passage=44 that supplies supplemental air fromy the main air supply. .lnasmuch as the means for controlling the supplemental air 'supply may be substantiall f the same as that shown in my Patent No. 1,369,520, dated February 22, 1921, it is un necessary .more full to describe the same, it being merely desira le to state that the supplemental air jets are discharged through the openings 45, 46 onto the discharged coating material Aand air or other motive agent issuing from inside the cap 33 and through the valve member 30.

I provide desirably motive agent conand controlling the closing of the said valve member 30. For this purpose I have herein represented a flexible diaphragm 47 of any suitable material and which is held in place by a caplike member 48 `having anexterna-l thread 49 received in the internally threaded flanged rear end of the-part 28. The outer portion ot' the diaphragm 47 being held immovable 41 shown as diierentialby the envagement of said cap-like member4 48 throughout its entire perip ery, said diaphragm presents an efficient sealv against eakage of the motive agent, and obviates the use of packing or the like, the present invenved ring 43, thel latter constituting a nely comminuted tion being an improvement in this and other respects over the construction disclosed in my vPatent No. 1,401,397, dated December 27, 1921. The valve member 30 is threaded at its rear or right hand end viewing Fig. l, as shown at 59, and it passes through the diaphragm. which is otherwise unpert'orated. said valve member 3() being held in position by a nut 51 at one face of the diaphragm and two nuts 52 at the opposite face thereof, a washer 53 being positioned between the two nuts 52. in this manner the valve member` 30 may be adiusted relatively `to the diaphragm if necessary, to compensate for wear at the outer or paint orifice closing end oi' said "valve/meteen Bearing against the washer is a coiled spring 54, the opposite end of which bears against a washer or ring he which may be adjusted in position by means ci an elongated nut 56 threaded at 57 into an axial opening in the cap-like member 43. iin this manner the tension or compression ot the spring 54 may be varied as required in conneet-irril with varying pressures oi the air or motive agent available.

.lvesirably ll provide means constituting astop or abutment for the inward movement ot the valve member 30- and of the diaphragm. For this purpose I have herein represented a meticn limiting pin 58, yexternally threaded as indicated at 59 into the elongated nut or threaded sleeve 56. The position et the limiting pin may be varied by rotating it to the desired extent, and in this manner the extent of movement 'of the valve member 30 to the left viewing Fig. 1 may be controlled. llt is noted that by vunsrrewing the cap-like member 48 the entire diaphragm and paint control valve assembly may be'removed rearwardly as a unit.

lli)

lllfx "With the parts constructed as described" the air or other motive. agent isadmitted through the passage 4' past' the lvalve, 8 and thence into the chambers 19, 20 where it acts upon the diaphragm 47 at the forward or left hand side thereof viewing Fig..l. and thus opens the lvalve men'xber 30, the air having previouslyentered the passages 31, 32, so that instantly upon the openingof the valve member 30 the discharging air strikes the coating material which is inside the cap 38, and discharges the same in aV mass as fully disclosed lin'my saidpatent. Dezirably the paint sup-l plied through the passage is in this embodiment ot my invention supplied under pressure, but capillary action as disclosed in my said Patent No. 1,172,213 occurs. lt will be observed that immediately upon opening the valvey the air is discharged through the passages 3l, 32l and hence lvery slightly prior `to the movement. of the. daphragm 47 andy consequent opening ofthe orifice 40. Conversely. airwill continue toissue through passages- 31, 32 `for a slight phragm 47 to close the orifice 40, thus iny suring the atomization of the last particle of the coating material. l

In Fig. 3, I have shown a second embodiment of my invention, namely, one wherein the coatng material is carried in a container tecured to and forming a part of the tool or appliance. Otherwise the .structure represented in Fig. l 1s substant1ally the same as that already described and need not be referred to in detail, since the same numerals are employed where the construction is the same or substantially the same.

In that embodiment of my invention shown in Fig. 3, the container for the paint or other coating material is .indica-ted at 66. it having a llanged upper end 61 overlying which is a packing ring 62 and below which is a-ring 63 which may be clamped or held in any suitable way aganst the under side of the flange 61. The cover is indicated at 64 and is desirably integrally form-ed With'the body portion 65 which has a vertical passage 66 into the lower end of which is threaded a pipe 67 extending de`` sfrably nearly to the bottom of the container and through which thepaintl or other coating 1nater1al is supplied to the passage 36, and hence into the space Within the cap 38. The body is provided with an air supply opening 68 into which is threaded a nipple 69 and onto the protruding end of which is threaded the handle member 70 which when threaded into place as described is secured in position by a screw 7l extending through the cover portion 64 and into the raid handle portion 70. The means for heating the air or other motive agent is desii-ably the same as that shown in Fig. 1 'and need not be particularly described and the valve member 30 is also substantially the saine and is controlled by a diaphragm 47 in substantially the same manner and need not be further described.

.The lower portion 72 of the handle receives a pipe 73 by which air or other motive agent is supplied under `pressure to a passage 74 which is in4 communication with a valve chamber 75 receiving a bushing 76 threaded into the handle and having a valve seat 77 for a valve 78 normally held closed by a col spring 79. The stem 80 of said valve extends throughI suitable packing 81 in a socket or recess in the end of the bushing 76 and takes against a trigger-like operating lever 82 pivoted at. 83 upon the under side of the part 70. The bushing 76 is provided with a assage 84 by which the air` when the valve 78 is opened, is admitted into the passage 85 and thence through the space 19 about the heating coil 21.

Preferably I provide means for lplacing the coating` material in the container under pressure of the motive agent. To this end,

as shown in Fig. 4, the cover 64 is provided with an opening 86'which receives an exteriorly threaded nipple 87 having an axial passage 88 Within an enlarged portion of which is seated a spring-controlled nonreturn valve 89 lto prevent return of the" Said,

motive agent from the container.' opening 86 communicates with a passage 90 extendmg transversely ot' the body member 65 and opening into the main air or mot1ve agent chamber 20. The flow of air through said passage 90 is controlled by a valve v91 threaded in a bushing 92 which in turn is externally threaded tor engagement in the body portion 65 of the tool. Also in com-- munication with the transverse passage 9() is 1a vertical passage 93 having a restricted lower end inv which seats a spring-controlled valve 94. Said vertical passage 93 receives an externally threaded sleeve or bu:l hing 95 having an axial passage 96 opening at its lupper end to the-atmosphere and within which the spring 97 of lsad valve 94 is seated. vIn this manner air under presure is admitted from the main chamber 20 through passages 90 and 88 to the container, the amount and pressure of which ad-v mitted air may be controlled or shut oft entirely by means of the valve 91. The spring valve 89 prevents the escape of any particles of coating material through the passage 88. 'lhe valve-controlled passageA 93 opening .to the atmosphere provides `a safety vent to rel'eve against excess pressure of the motive agent, the pressure of the springv 97; upon the vent vvalve-94 being adjustable and preferably regulated to permit said valve to open to relieve against pressure in excersof the maximum desired to be built up in the container or in the main air chamber.;

Having thus described one illustrative embodiment of 4my invention I desire it to be understood that although specific terms are employed they are used in a generic and descriptive sense and not for purposes of limitation, the scope of the invention being set forth in the following claims.

1. 4A tool for applying coating comprising a body having passages for coating material and for air under pressure, a hand valve for. controlling the entrance of air under pressure into the tool, a valve stem having an'axial air passage therein and mounted mg material control valve having a stem a body provided with mounted for reciprocating movement in 'said body, and an air-actuated flexible, springreturned diaphragm adjustably connected -\vith said valve stem and ezposed to air pressure only at the side opposite the said spring and means lixedly yto secure said dla phragm with relation to said body. o

3. In a tool for applying coating having a body provided with passages for coating material and for air under pressure, a coating material control valve having .a stem mounted for reciprocating movement 1n said body, a ilexible diaphragm iizredlg secured in positionwith respect to sa1d ody .and operatively connected with sa1d valve stem and exposed to air pressure u on one side only, and resilient means ten ing tomove said diaphragm against the pressure of the air, said resilient means beingadjustable whereby said diaphragm is adapted for use over a wide range. of operatingair pressure.

4. In a tool for applyin'gcoating having passages for coating material and for air under pressure, aconting 'material control valve having a stem mounted for reciprocating movement in said body, a flexible Vdiaphragm exposed. to 'air pressure upon one side only vandfoperatively connected with said *valvev stem, a lcap-'like member securing s'aiddiaphragm in fixed position in said body and adjustable spring tending to flex said means carried by said cap-like member diaphragm against the pressure of the air. j l i 5. In -a tool forapplyingcoating having a body provided With-'passages for coating material and `for-.air under' pressure, a coating material control `valve. having. a stem mounted for reciprocating movement in said body, a flexible diaphragmfexposed to air pressure upon one sideonly and operatively connected with said valve stem, acap-like member securing.-saiddiaphragm in fined position in' said body, adjustable spring means carried by said cap-like .member tending to flex said diaphragm against the pressure of the air. and an adjustable stop also carried by said cap-like member for limiting the rearward movement of said diaphragm. j

6. In a tool forapplying coating having a body provided with passages for coating material and forI air under pressure, coating material control mechanism including a valve stem mounted for reciprocating move-l ment in an air passage of said body and la flexible diaphragm fixedly secured 1n position with respect to said body and oper-z atively connected with saidvalve stem spring means to kflex the same in one direction, said coating material control mech-` y nism being removableas a unit rearwardlyof .said body.

7. A tool- `for applying coating comprising a bodyhaving passages for coating i matey rial and for air under pressure, a manually operable valve for controlling the entrance of air under pressure into the tool, and coatingv material Control means including a valve having a stem provided with an axial air passage and mounted for reciprocating movement. in an air chamber of the tool, and a lexi'ble air-actuated spring-returned diaphragm tixedly mounted in said air chamber, said valve stem being secured at its inner end to saidv diaphragm.

8. A` tool for applying coating comprisinvr a body having passages for coating matema] and for air under pressure, a manually operable valve for controlling the en trance of air under pressure into the tool, coating material control means including a valvehaving a stem provided with an axial lair passage. and mounted for reciprocating movement in an air chamber ofthe tool, said valve stem engaging at the inner end thereof an air-actuated spring-returned diaphragm lnounted in said air chamber, and

air `heating means in said body past which -flows the incoming. an' under pressure.

9. In a tool for applying coating having a body provided with passages for coating material and for air under pressure, the latter including an elongated chamber, 'means in said chamber-for heating the air `passing therethrough. f y

' 10. In a tool for applying coating having abody provided with passages for coating material and for air under pressure, said air assage including a tubular chamber formed in said body, and means including an electrical resistance -coil in said chamber Afor heating the air passing therethrough.

11. In a tool for applying coating-having a body provided with passages for coating material and for air under pressure, means in said body for heating the inflowing air. 12. A tool forapplying coating comprising a container, a cover and va tool proper formed with-the cover and having a motivel agent chamber therein and a passage' leading therefrom to said container, a non-return valve positioned in said cover in communica tion with said chamber through said passage for admitting .a motive agent under pressure to the container above the coating material therein, valve means for controlling or shutting off entirely the flow of motive agent into-the container, past said non-return valve. and munication with said Apassage for relieving against excess pressure jot the motive agent. 13. Means forv .applying coating' comprising in combination, acontainer for the coating, a cover therefor, a paint gun body integral with said `cover and having passages for coating material and for air under pressure, a laterally extending handle portion a safety valve also in comfor heating Athe inowin 1in said-lair passage .of thehan'dle portion air. 14. In'a tool vfor applying coatingvhaving t a body provided with passages 'for coating a body provided wit material and for air under' pressure, coating material controlmechanism including'. a

valve stem mounted for reciprocatin movef mentin an air passage of said Vbo ,said valve stem havmg ,an 'axial opemn therein and extending to the discharge en thereof,

and a flexible diaphragm operativel connected with said valve stem and fixe ly se cured in position. with respecttosaid body, said coatn material control mechanism being remova le as a unit rearwardly of said 1g In a tool for a plying coating having Ih passages for coating material andb forl air under pressure, coatin material control mechanism including'a va ve stem mounted for reciprocating movement in an air passage of said body, said valve stem having an axial openingtherein and extending tothe dischargeen'd thereof,

4and a flexible diaphragm 'operatively connected with said valve stem'and ixedly se-` cured in osition with respect to said body, said diap ragm being exposed to air pressure at one side only, there being spring return means at the otherside of the diaphragm, said coatin material control mechanism bein remova le as a unit rearwardl 4of said'bo y.. v

16. In a tool for aplplying coatinghaving anism bein removable as a `unit rearwardly of said b'o 17. A too for applying coating comprising-a container, a coverV and a tool proper` carried by the cover, said cover andl tool proper being 'integrally formed and 'provided with a passage 90, three valves 89, 9'1.,

94 located in proximity to and controlling the flow through said passage 90 for the purpose set forth. o

18. Means for applying coating comprising in combination, a container for the body,

a cover therefor, a paint gun integralwith said body and having passages for coating material and for air under pressure, valve means in said body and controlling the coating material, a laterally extending handle portion structure distinct from the gun body and having passages therein for the air unsecuring the handle to the gun body and through .which the'air under pressureh flows into said gun body andA means in said handle ol heating the air on its passage to v'said Q 5'@ 19. A tooll for Aapplying coating having a body provided with passages for coating .der pressure,- 'and a pipe or` nipple y68 for material-and for air under pressure, -said tool having a handle 70 with a' heating ele- -ment receiving-chamber therein, the wall of said chamber having a spiral flange receivmg said heating element and causing the air to circulate thereabout on its passage to the point of discharge.` l

`20.,A tool. for applying coating having a body*` `.provided -wlth passages "ir coating material. and forfair under pressure, said tool having a handle with a heating element receivlng chambentherein, the wall of said cham-ber being constructed and arranged to cause the air to take a circuitous course along said heating element on its passage to the point of discharge. Means for applying coatingcomprising in'combination, acontainer for the coating, aocover therefor, a paint gun body integral with\said cover and having assages for coating material and for air un er pressure, the air passage 'being suiiciently enlarged Ato receive air heating means, air heat- 1ng means in the enlargement of said lair passage,.valve means in said body to controll the flow of the. coating material, and a laterally extending handle portion structurally dlstinct from but secured to the said lbody and.` having valve control means for introduclng air under pressure to said air passage of the gun body.

' 22.' A tool for applying coating having a body provided with passages for coating ma- .terial' and for air under pressure, said air asv passage including a. chamber-formed in said Y b ody, and means'including an electrical resist'ance coll in said chamber for heating the air passing therethrough. f

23. A tool for applyingcoating comprisi ing .a container, a cover and a tool proper carried by .the cover, said tool having a chamber` 20, means for introducing air into said chamber, a nozzle, and means to permit the passace of air from said chamber 20 vto said nozzle, a assage 90 in communication with said cham er 20,\a Vent valve 94a regulating valve 91 and (a non-return valve 89 all in communication with saidpassage k90. 24. A tool for applying coating comprising la container, a coverand a tool proper integral with said cover and having a relative y narrow upright chamber 20 in com-- municationA with the source of, air supply and alsol with the point of air'discharge .from the tool, a passage 90'in communication with the chamber 20 a passage 88 in communication vwith the chamber, a non-ref turn valve 89 controlling said passageand a regulating valve 91 controlling said passage 90.

25. In a tool for applyin coating, said tool provided with passages or coating matthe motive agent passing therethrough.a

#26.*A11 atomizing device comprising a nozzleya tube for yconducting uld to said 10 nozle, and a heating element located in said tu e. K

In testimony whereof, I. have signed my name to this specification.

HERBERT W. DAY. l

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