US1410574A - Machine for applying coatings - Google Patents

Description

A. E. JOHNSON. MACHINE Foa APPLYlNG CoATlNGs.

APPLICATION FILED DEC.26, 1918.

3 SHEETS-SHEET I.

Patented Mar. 28, 1922.

A. E. JOHNSON. MACHINE Foa APPLYING commes.

APPLICATION. ElLED DEC. 26, 19H3.

Patented Mar. 28, 1922.

EETS-SHEET 2.

A. E. JOHNSON.

MACHINE FOR APPLYING COATINGS. APPLICATION FILED 05026. I9Is.

73 /A/ VEA/7m?.

Patented Mar. 28, 1922.

3 SHEETS-SHEET 3.

onirica ALBERT E. JOHNSON, F BEVERLY, MASSACHUSETTS, ASSIGNOB, T0 UNITED SHOE MACHINERY CORPORATEON, OF PTERSON, NEW' JERSEY, A CORPORATION 0F NEW JERSEY.

ralenti.

Application led December 26, 19153.

To all 107mm t may courant.' i Be it known that l, Lamar E. JOHNSON, a citizen of the,l United States, residing at Beverly, in the county oititssex and State ot Massachusetts, have invented certain lnprovements in Machines for Applying Coatings, ot' which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like, parts in the seir'yeral figures ihrs invention relates to machines tor applying coatings such as liquid coloring materials to boots and shoes. A particular object ot the invention is to provide a machine suitable tor use in applying coatings to the edge surfaces ot soles and heels after they have been incorporatedin shoes in the process ot' shoe manufacture, but it will be apparent -trom a consideration ot the construction hereinafter described that the invention is not thus restricted in its application and that a machine embodying novel features of the invention is susceptible of a variety ot uses.

ln linishing operations on some types oit shoes, a very quickly drying enamel or paint is used to'cover and beautify the edges or" the sole and heel ot a shoe. This enamel or paint is usually applied-by the aid ot a brush `which is `lirst dipped into the paint and then carried to theedges of the sole and heel, theoperative holding the shoe in one hand and the brush in the other. YIt will be aparent that as thus carried out the operation is slow and the resulto are far tromunitorm, since, tor example, the width ot the edge suriace varies and a larger quantityot the paint is likely to he applied to some portions ot the sui-tace than to others. Furthermore, the paint dries so quickly that any overlapping or' the strokes ot the brush is apt to vmar the appearance ot the iinhhed surtace.

lt is an important object ot the present invention'to provide machine organized to apply various kinds ot coatings, such as blackings` paints. and quick drying enamelsVA to the el i-s ot the soles lheels otl cornpleted shoes. so as to impr te the quality ot 'il increase the quantity ot perform in a p or col Specification of Letters Patent.

Serial No. 268,356.

proved means for determining the position ot the work relative to the spraying nozzle.

il. teature et marked importance consists in the construction and arrangement by which the amount of spray delivered to the work is controlled by the work itself so that as variations in certain characteristics of the work occur the .spray is automatically regulatedv in accordance therewith.

ln another aspect, the invention comprises an organization in which work engaging or measuring means associated with the spray nozzle is operative to control the nozzle in accordance with characteristics such as dimensions ot the work presented for the spraying operation;

Other features ot the construction are designed particularly to admit of rapid and effective removal ot the spray material from the nozzle and its supplying conduit whenever work is to be discontinued tor a considerable period ol time as, for instance, at the end of the working day. rlhis is ot no little importance since some of the enamels dry so quickly that it not removed etlectivelv at the propertime they are likely to occlude the passageways ot conduit and nozzle.

@ther objects and features ot the invention will be apparent from the following detailed description and will be pointed out in the claims.

in tire oiawings,

Fig. is side elvation of a spraying machinerepresenting one embodiment ot my invention rio'. 2 is section through the nozzle 3 mecha ism o the machine along the line 2-2 ot Fie 2 is a similar view to that ot Fig. 2 showing the parts slightly enlarged and in a dillerent position relative to each other 'trom that which they occupy in Fig. 2;

5l is a trontview ot the machine shown in Fig. i;

4 is view ot the trent portion ot the machine illustrating a slight modification:

5 is a detail view showing a slide tor a part ot the conduit;

"ii. 6 is a detail view along` the line l, and

l' is a detail view in perspective ot the uositioning means shown in side view illustrative machine, there is proa i; ik or receptacle 8 lor the blacku other spray material, bracket l!) extending from the frame l2 being provided as a suitable support for the receptacle. Mounted in brackets l0 and 14 is a vertical shaft 16 which is suitably journaled in the bottom of the receiver to project therethrough and operate a stirrer 18 having the function of keeping the liquid contents of the receptacle ofl uniform consistency. .Vertical shaft 16 may be driven by any suitable means, that shown in the present construction comprising` bevel gears 2O and 22 operatively connecting the shai't 16 with a horizontal shaft 24 carrying a pulley 26 arranged to be driven from any suitable source of power. Connecting the receptacle 8 with the nozzle 28 is a pipe or conduit comprising preferably a relatively movable portion 30 and a stationary portion 32, the latter being supported at each end by a washer-like structure 33 having a cross-bar 35 (Fig. 6) and opening at 34 into the fluid chamber 36 oit the nozzle. As shown. the movable Y part 30 of the pipe or conduit'for the liquid extends well down into the receptacle 8 to a point just above the stirrer. Surrounding the conduit throughout the middle portion thereof is a hollow structure 38 having a passageway 40 for compressed air which is admitted through the pipe 42, the latter being connected to a reservoir 44 for compressed air which may be supplied according to any of the well-known methods. The supply of' air for the spraying operations is controlled by a valve 460i"- any ordinary construction located in the portion 48 ot the pipe 42, the said valve being controlled by means under the control of the operator comprising, in the'construction shown, a link 50 attached to the valve at one end and at its other end to a second link 52 having its lower end attached at 54 to a lever 56 pivoted at 58 to the frame of the machine and arranged to be operated from a treadle (not shown) by means of a connecting rod 60. Removably attached to the hollow structure 38 at the front part 'thereof is the nozzle structure 28 which is constructed as shown most clearly in Fig. 2 to provide passageways for the fluid and other passageways for the air which serves to force the fluid from the nozzle under pressure. yIhe upper portion of the nozzle structure is preferably in the form of a hollow castingl 62 having side walls 64 to which are attached by screws'or other suitable astening means the thin side plate 66 arranged to converge downwardly to the outlet oi the nozzle, the side plate 66 being continuous around the end portions of the nozzle and being held in place by end plates 68- and 70. 4Since the side plates 66 are relatively thin and flexible a member 7 2 is provided for engaging the lower edges of the same throughout their lengths, the said member being secured detachably by a fastening at 74 at one end thereof and by screw threaded fastenings 76 at its other' end. This member 72 constitutes the real outlet of' the nozzle,the size of which is controlled by a slide 7 8 in a manner to be hereinafter described. Inside of the casting 62 there is positioned a smaller similarly shaped member 80 constituting in effect a flaring continuation of the conduit 32, the two being joined as heretofore pointed out to communicate with each other at the point 34. The sides and ends or' the member 80 have secured thereto throughout the continuous lower edge thereof a relatively thin flexible extension 82 with downwardly converging sides extending at the lower ends thereof' almost into the plane of the lower edges or' the sides 66. Inside of the member 8O is a long wedge shaped member 84 shown in cross section in Fig. 2 and having the function of controlling the amount of fluid which can pass from the fluid chamber 36. In order to adjust the member 84, there is provided a link 86 securely attached thereto by a pin 88 and having at its upper end a screw threaded portion designed to be engaged by a correspondingly threaded nut 90 which is screw threaded into an opening in the upper part of the casting 62. Upon turning the nut 90, the link 86 and with it the wedge 84 are adjusted in a vertical direction toward and from the outlet of the nozzle, and because of the difference in pitch of the interiorly and exteriorly threaded portions ofV the nut the member 84 may be adjusted with the required lineness and precision to control accurately the amount of liquid at the outlet of the nozzle. Vhereas in Fig. 2 the parts are so adjusted asto sluit off the air and the fluid at theoutlet of the nozzle, the showing ot Fig. 2a is such thatthese same parts are shown so disposed as to permit air to pass along the passageways 92 and fluid along the passageways 94 from the fluid chamber 36. In this connection it should be pointed out that the air passageway 49, which surrounds the stationary part 32 of the conduit for the spray material and also the upper portion of Y the movable part 30 of the conduit, communicates at one end with the receptacle 8 and at its other end, indicated at 93, with the air chamber 95 in the nozzle.

In order to position the work properly at the outlet of the spray nozzle there is provided a member 96 in the forni oir a rotatablv mounted disk carried by an'arm 98 detachably secured to one end of the nozzle structure 28. This disk is designed to enter the rand crease or" the shoe as indicated by dotted lines in Figs. l and 4 to operate as a gage for the work and to serve also as a shield to'prevent application or" the liquid to portions of the shoe above the heel or sole edges. Preferably, a work rest 100 is also provided against which the tread surface of the heel is placed and which co-operates with the disk member 96 in positioning the Work. This Work rest comprises, in addition to the plate 102, which engages the tread surface of the heel, a plate 104 hinged for limited movement to one edge of the plate 102 and pressed upon by a spring actuated member 106 'to cause the plate 104 to engage the breast surfaces of heels formed at various angles With respect to the tread surfaces thereof. Attached to plate 102 is a block 108 having secured thereto cleats 110 provided With -beveled edges 112 arranged to engage correspondingly beveled edges on a support 114, the arrangement providing for sliding movement of the -Work rest 100 on the support-ing member 114, a pin 116 being arranged to engage another pin 118 to limit the movement of the Work rest on said supporting member. vPreferably, the supporting member 114 is pivotally mounted for limited movement in a slot in the end of the shaft 120, said shaft being rotatably and slidably mounted ina bearing 122 on the frame of a machine. In order to hold the shaft 120'projected toward the right in Fig. 1 in a position to present the work rest in a location adjacent to the disk member 96 there is provided la spring 124 mounted at one end-in the bossV 126 on the frame of the machine and arranged to engage with its other end the end surface V128 of the shaft 120, a collar 130 being adjustably secured to the shaft to' determine the extentof projection of the shaft toward the right in Fig. 1, Mounted upon a stud 182 is an arm 184 havingasegmental rack 136 at its upper end arranged in Yconstant mesh with a gea-r 188 secured to shaft 120 by means vof the ordinary key and slot connection to Vpermit of the sliding movement of said shaft as above described. Selectively engaged in any one of a plurality of openings 140 in the arm 134 is one end of a coiled spring 142 so arranged as to tend constantly Vto return said arm to a position of rest in which a stop 144 carried -thereby engages With a portion of the machine frame 12. The operation of this part vof the Ymechanism may be briefly statedV as follows:

A shoe positioned for the spraying operations is so arranged that the disk member 96 engages in the rand crease above the heel While at the same time the tread surface of the heel engages the plate 102 of the Work rest 100,-the work rest being so arranged in connection with its supporting shaft 120 that the loivest heel will be pressed more or less firmly against the member 96 by the action of the spring 124. At the beginning of the spraying operation, a'heel engaged with its breast portion against the plate 104 is positioned with one breast edge thereof substantially in line with the outlet ofthe nozzle. The heel Will then be turned at a regular rate so as to presentthe entire curved sur- With the rotation of the Work rest 100 and its supporting shaft 120, the arm 134 is swung about the stud 132 against the action of the spring 142 which operates upon removal of the Work to return the shaft 120 and the Work rest carried thereby back to initial position in so far as rotation of the shaft can effect that result, it being understood that the Work rest and especially the plate 100 is not necessarily brought back to initial position determined lby the proper amount of relative sliding movement of the plate 100 and its supporting member 114, relative movement of these parts being variable Within limits determinable as heretofore pointed out by engagement of the pins 116 and 118.

In connection with the Work rest, its supporting shaft 120 and the spring 124 Which constantly urges the shaft and Work rest to the limit of their movement in one direction and toward the relatively stationary member 96, it is pointed out that these parts constitute in effect a Work measuring mechanism automatically adjustable to various sizes of heels and to the varying height of each individual heel during rotation thereof beneath the spraying nozzle. In connection With the Work rest and With the described Work measuring mechanism there is provided a means for controlling and regulating the spray with respect to the requirements of the Work. In the present embodiment of the invention, the controlling means for the nozzle comprises a member or slide 78 operated to effect constantly the most precise adjustments thereof by means associated With the measurinfr means for the Work and consisting preferably of a cam member 146 mounted fixedly on the shaft 120 and arranged to engage rotatably in a slot 148 in a block 150 attached to anintermediate portion of the member 78. The arrangement is such that movements of the Work rest 100 toward Vand from the guiding member or abutment 96 is accompanied by corresponding movements of the member l78, slidable in a bracket 151 and in nozzle 28` not only during the insertion of heels of different dimensions but also during movements of the Work rest relatively to the member 96 while each individual heel is being turned to provide for the spraying of the curved surface thereof. The member 78 thus regulates the Width of the spray in exact accordance With the height of the curved surface of the heel as the said heel varies in height in passing from one breast edge of the heel around to the other breast edge. It will be apparent, then, from the described construcshoe vin proper position against the work positioning members 96 and 10G to turn the same during the spraying operation, since the spray is automatically regulated to the requirements of the work by the means de- At the end of tl e days work it is important that the spray nozzle and the conduit leading thereto should be cleared of the spray material which otherwise might harden in the passageways and nally cause occlusion oli the same. 1n order to elleet this operation the conduit has been made in relatively movable sections and the nozzle parts have also been constructed and arranged for movement relatively to each other to assist in the removal of the spray material from the nozzle by means of the compressed air supply. According to the preferred construction, the movable portion 30 of the conduit is carried by a slide 156 mounted and normally held tightly between projecting portions 158 of the hollow tubular structure 38. As shown most clearly in Figs. 1 and 5, the slide extends across the passageway 4() for the compressed air and normally holds the movable conduit 30 centrally wit-h respect to said air passage and in communication with the stationary part 32 oi the conduit. By loosening the tightening screws extending between the projections 158 the slide 156 may readily be displaced to the left in Fig. 5, thus moving the movable portion 30 of the conduit out of alinement with the stationary portion 32 and bringing an opening 160 in the cross bar 162 of the slide op Y posite the end of the stationary portion 32 ol the conduit so that air under pressure may enter thn conduit and passing therealong remove the fluid there-from and also from the iluid chamber 36 and the passageways 94 of the nozzle, thus ellecting a complete removal of the fluid from these parts. 1n order to make the air pressure greater and more effective, the construction of the nozzle is such as `to permit the cutting otl of the air outlet of the nozzle, this being accomplished by lowering the member 80, 82 so that the lower converging edges of the latter will completely close the air passages 92 as disclosed in Fig. 2 of the drawings,

' lowering of the member 80, 82 being effected by the proper manipulation ot the set screws 164. 166. Thus with the air outlet closed in the nozzle the air under pressure must find its way through the stationary conduit 32 an(L the expanded flaring` end thereoi which constitutes the chamber 36 in the noz- -zle and linally along the passageways 94,

166 and'irmly secured therein by the cooperation of the two set screw members 164, 166 after which the slide 156 will be returned` to its normal position, re-alining the movable and stationaryV portions of the conduit, thus placing the machine in condition for use in spraying operations. Obviously, adjustment of the member 80, 82 may be utilized to vary the size .of the air passages 92 in the nozzle in accordance with the requirements oi' the work. A

Ina modification of Ahe invention shown in 4, the spray nozzle 28a is much lesscned in width in comparison with thenozzle disclosed in Fig. 1, since the nozzle or' the modification is intended to operate upon the edge of the sole, and is adapted for ready substitution for nozzle 28 on the head of the machine. An accompanying change consists in the substitutionv ofanother form of work rest designed to engage the bot-tom or the sole and shown as comprising a roll 170 mounted rotatably von a support 172 pivotally mounted at 173in the shaft 120 and designed to be quickly substituted for the work rest 100 and its support 114 made use of in operating on the heels oi shoes. In addition to the roll 170 there is mounted on the member 172 a combined shield and edge Vguide 174. Otherwise the construction and mode of' operation of the device is the same as that of the machine already described, regulation of the spray being effect ed through the controlV of the sliding member 7 8 by means of the work contacting roll 170 as will be obvious from the foregoing de# scription and from an inspection of Fig. 4.

1n operatingv the machine, the operator places a shoe with the rand'crease thereof engaged with the member 96 and with either the work rest 10() or the roller 170 engaging the tread surface of the heel or of the sole, as the case may be, and then depresses the treadle to open the air valve 46 to permitof the inllow of air under pressure, thus forcing the spray material from the nozzle on to the work while the same is being turned toV bring the various portions thereoi1 in line with the spray, and finally releases the treadle and removes the shoe at the end of the spraying operation, vautomatic. control of the spray in accordance with the require ments of the work making it necessary only that the operator maintain the shoe inv con-V tact with the work positioning means and turn and otherwise move the shoe at the rate required to obtain the best results.

Having describedV my invention, what 1 claim as new and desire to secure by Letters Patent of the United States is:

1. 1n a machine of the class described, a spray nozzle, and means for ejecting spray from said nozzle constructed and arranged to be controlled by varying characteristics of the work in its' presentation to the machine.

2. 'In a machine of the class described, a

.spray nozzle, and means controlled in accordance With varying dimensions ot the Work for determining the amount of spray ejected fromsaid nozzle.

3. In a. machine of the class described, a spray nozzle,a Worlr rest for positioning the work with respect to the nozzle, and means controlled by movement of the Work rest for determining the. Width of the spray from the nozzle.

4. In a machine ot the class described, a spray nozzle, and means 'for regulating automatically the dimensions of the jet of spray ejected from said nozzle.

5. In a machine of the class described, a spray no-zzle, a Work rest for positioning the Work With respect to the nozzle, and means controlled automatically from the Work rest for regulating the spray from the nozzle.

6. In a machine of the class described, a spray nozzle, a member for engaging in the rand crease of a shoe, a member for engaging another portion of the shoe, and means for regulating the spray from said nozzle const-ructed and arranged to be controlled by relative movement ot said members.

7. In a machine of the class described, a spray nozzle, a member for engaging in the rand crease of a shoe, a movable member for engaging another portion of the shoe to measure variations in certain structural characteristics of the shoe, and means controlled by said measuring means to regulate the spray from the nozzle.

8. In a spraying machine, a spray nozzle, means for measuring the Work to which the sprayed material is to be applied, and means controlled by said measuring means for regulating the spray from the nozzle.

9. In a spraying machine, a spray nozzle, means for automatically measuring the Work to which the sprayed material is to be applied, and means controlled by said measuring Vmeans for adjusting the size of the outlet of the nozzle.

10. In a spraying machine, a spray nozzle. a member adapted to engage in the rand crease of a shoe to position the shoe and limit the application of spray thereto, and a. member for engaging another portion of the shoe for controlling automatically the Width of the spray from said nozzle.

11. In a spraying machine, a spray nozzle, a Work rest mounted for rotation so as to present all portions of the 'Work to the nozzle. and means for returning the rest to initial position. i

12. In a spraying machine, a spray nozzle, an abutment for engaging a shoe to position the same properly With respect to the nozzle, and a work rest mounted for movement in a plurality of directions and along different paths so that all portions of the Work may be presented to the nozzle.

13. In a spraying machine, a spray nozzle, a Work rest mounted for rotation so as to present all portions ot the work to the nozzle, means for returning the rest to initial position, and means for automatically adjusting the Work rest to variations in the Work during rotation thereof.v

14. In a machine of the class described, a spray nozzle, a Work rest against which a shoe is pressed, the position of which is controlled by the shoe during presentation thereof to the nozzle, and means associated with the Work rest for cont-rolling the spray from the nozzle.

15. In a spraying machine, a` spray nozzle, ,means -for measuring the Work upon presenting the same in proper position to receive spray from the nozzle and constructed and arranged to move with the Work as the latter is turned to present the various portions thereof to the spray, and means controlled by said measuring means tor determining the size of the outlet of the nozzle.

16. In a spraying machine, a spray nozzle, a rotatable rand crease guide for positioning the shoe with respect to the nozzle, and a Work rest for engaging another portion ot the shoe and mounted both slidably and rotatably so that various portions of the shoe may be presented to the spray from said nozzle. v

17. In a spraying machine, a spray nozzle,

a guide for the shoe Vto position the same properly withrespect to the nozzle and constructed to shield portions of the shoe against the spray, and a Work rest mounted for movement in a plurality ot directions and along different paths so that various portions of the Work may be presented to the nozzle. l

18. In a spraying machine, a. spray nozzle, means for measuring the work upon presentation ot the same in proper position to receive spray from the nozzle and constructed and arranged to move with the Work as the latter is turned to present the various portions thereof to the spray, and a member movable across the outlet of the nozzle and controlled by said measuring means for determining the size of the outlet of the nozzle.

19. In a spraying machine for shoes, a spray nozzle, a rotatable shield Jfor limiting the, application of spray to a shoe, and a Work rest for engaging another portion ot the shoe and mounted both slidabl-y and rotatably so that all portions of the edge of the shoemay be presented to the spray from said nozzle.

20. In a spraying machine, a spray nozzle, a container for the spray material, means for forcing the spray material under pressure from the container and through the nozzle comprising a pipe for air under pressure, a valve in said pipeunder the control of the operator, and independent means for controlling at the nozzle the delivery of spray.

2l. ln a spraying machine, a spray nozzle, a container for the spray material, means for forcing the spray material. under pressure from the container and through the nozzle comprising a pipe lor air under pressure, a valve in said pipe under the control of the Operator, and Work-controlled means for controlling at the nozzle the delivery ol.

spray. i p

2Q. In a spraying machine, a spray nozzle, a container for the spray material, means for forcing` the spray material under pressure from the container and through the nozzle comprising a pipe for air under pressure, a valve in said pipe under the control ott the operator, and means for automatically controlling the delivery of spray from the nozzle.

ln a spraying machine, a spray nozzle, a reservoir for the spray material, a conduit tor the spray material leading from the reservoir to the nozzle, a passageway for air under pressure communicating' with said reservoir and with the nozzle to force the spray material from the reservoir through the lconduit and from the nozzle, and Work controlled means for determining the size of the outlet of said nozzle.

In a spraying machine, a spray nozzle, a reservoir for spray material, a conduit for spraymaterial connecting the reservoir to the nozzle, a passageway for air under pressure communicating with said reservoir and with said nozzle to torce spray material through said conduit and trom said nozzle,

means under the control ot the operator for controlling the air passage, and automatic means for cont-rolling the nozzle opening.

25.` In a spraying machine, a spray nozzle, a reservoir for the spray material, a conduit for the spray material leading trom the reservoir to the nozzle, a passageway for air under pressure communicatingl with said reservoir and with the nozzle to lorce the Vspray material from the reservoir through a reservoir for spray material, and a conduit connecting said reservoir with said nozzle and comprising a stationary and a movable portion so constructed and arranged as to be disconnectible without removal from the machine, the construction andarrangement being suchthat air under pressure may be forced through the stationary portion of the conduit to remove the spray material therefrom. Y

27.--In a spraying machine, a spray nozzle,

raient/1i a reservoir for spray material, a conduit connecting said reservoir with said nozzle and comprising a stationary' and a movable portion, a passageway for air under pressure, and means tor'moving the movable portion et the conduit to connect the stationary portion ot the conduit with the air passageway, the construction and arrangement being such that air under pressure may be forced through the stationary portion of the conf duit to remove the spray material therefrom.

28. In a spraying machine, a spray nozzle, a reservoir for spray material, a conduit connesting said reservoir and said nozzle comprising a stationary part and a movable part, a passageway for air under pressure surrounding said conduit, and a slide carrying said movable part and operable to disconnect the movable part from the stationary part of the conduit and to place said stationary part oi' the conduit Vin communication with the air passageway so that the spray material may be forced from said conduit.

Q9. ln a spraying machine, a spray nozzle, a reservoir for spray material, a passageway for air under pressure, a conduit, connecting said reservoir and said nozzle comprising a stationary part and a movable part, and a slide for moving said movable part and operable te disconnect'the movable part from the stationary part of the conduit and to place said stationary part of thereon-duit in communication With the air passageway soV 'that the spray material may be tor-ced from said conduit.

30. In a spraying machine, a spray nozzle, a reservoir for the spray material, a conduit connecting the reservoir and the nozzle, a passageway for air under pressure ccmmunicating with said reservoir andy said nozzle to torce spray material from said reservoir through the conduit and from the nozzle, said conduit comprising relatively stationary and movable portions, a slide ttor carrying saidmovable portion and operable to disconncct'said movable-portion trom the stationary portion and to place the stationary 'tionoif the, conduit in communication `with the air passage, means for closing the air passage at the delivery endoi the nozzle.

and means under the control of the operative for controlling the passage et air through' said air passage and through the stationary part et the -conduit" to torce the spray material therefrom and from the nozzle.

3l. ln a machine ot the class described, a reservoir 'for liquid, `a delivery device, a conduit connectingthe reservoir and delivery device. a source of Huid pressure, and cornbined liquid-delivery and clearing connecu tiens included in the conduit Vbetween the reservoir and'source and the delivery device. ln testimonyvvhereof l have signed my name to this specication. Y

ALBERT JOHNSON.;

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