US2220921A - Apparatus for applying flock - Google Patents

Description

Nov. 12, 1940. I w, B THOMPSON 2,220,921,

APPARATUS FOR APPLYING FLOCK Filed Aug. 2'7, 1936- 2 Sheets-Sheet 1 2 uli r MM a 4 ,l' i 1 1 l Fly. 1. 34/ 3.9 L

Inveazor 5.9 QMQGM Nov. 12, 1940. w THOMPSON 2,220,921

APPARATUS FOR APPLYING FLOCK 2 Sheets-Sheet 2 Filed Aug. 27, 1936 In van for P. W W 'y @MQGW.

Patented Nov. 12, 1940 PATENT oFFicE I APPARATUS FOR APPLYING FLOCK Wayne B. Thompson, Winchester, Mass, assignor to Spray Engineering Company, Somerville, Mass., a corporation of Massachusetts Application August 27, 1936, Serial No. 9am

14 Claims.

The present invention relates to apparatus for applying material such as powder, comminuted or flnely'divided solid matter, non-fibrous flock, or the like.

In my Patent No. 2,194,487, granted March -26,

1940, I have disclosed an apparatus-adapted particularly for applying flbrous flock, the apparatus being provided with acontainer for the flock,

- a conduit provided with an air inlet and a discharge outlet, means for transferring the flock from the container into the conduit, and a blower for creating a. flock-entraining air current in the conduit to eflect the discharge of the flock.

The apparatusdisclosed in my said patent was provided to eliminate certain disadvantages in flock applying apparatus arising where the flock is held under pressure in a closed container, some of these disadvantages consisting in the expense that an air compressor necessitates, the fact no that the a paratus must be periodically thrown out of operation so that the container may be opened, refilled, and then closed again, and the fact that since in such apparatus the amount of the discharge is regulated by varying the pressure of the motive agent, with an air compressor it is frequently impossible to vary the pressure conveniently or with the speed that a given applying job requires.

The apparatus disclosed in my said patent so eliminates the use of an air compressor,-provides that the flock in the container shall be under atmospheric pressure, permits the instant regulation of the amount of material discharged,

and is designed for continuous operation.

' Inasmuch a the apparatus disclosed in my said patent is intended for the application of fibrous flock, it has certain stirring and agitating mechanism functioning to keep the flock constantly in motion and to insure that the flock fibres do not cling together and form balls del-.

eterio'us to proper flock application on a work piece. However, there are types of flock other than the fibrous kind which have relatively smooth surfaces and are relatively heavy as compared to the fibrous flocks. With these non-. flbrous flocks there is not exhibited to any great extent the clinging and balling up tendency of -flbrous flocks, and the problem of maintaining a continuous flow of such material-from the container is taken care of more simply. An excellent example of such non-fibrous flock is Cellophane flock, which, in various colors, gives an attractive appearance to a surface so coated.

, It is the-principal object of the present inven- 5 tion to devise an apparatus for applying nonflbrous flock, powder, or the like, which will embody an improvement over the apparatus shown in my said patent, that is, which will utilize the salient features of said apparatus tofeatures of the present invention reside in certain constructions, combinations, and arrangel0 ments of parts fully set forth hereinafter and then pointed out in the appended claims, .possessing advantages which will be readily apparent to those skilled in the art.

The illustrated embodiment of the present 15 invention will be readily understood from inspection of the accompanying drawings illustrating the best form of the invention at present known to the inventor, in which;

Figure 1 is a view in right side elevation of 20 my apparatus, with portions cut away;

Fig. 2 is a detail view in rear elevation; I

Fig. 3 is an enlarged detail view in plan of the portion of the apparatus lying at a level immediately below the hopper and the support 25 therefor; I H

Fig. 4 is a view in sectional elevation taken along the line 4-4 of- Fig. 2,but'with the valve operating lever pulled down;

.Fig. 5 is a view in perspective of the air inlet 30 of the conduit, the inner member of the conduit valve, and'the operating lever therefore; and v Fig. 6 is a view in sectional elevation of the slide taken along the line 6-6 of Fig. 3. 35

Referring to the drawings, the illustrated embodiment of the present invention is provided with a vertically disposed container or hopper l0 (Figs. 1, 2, and 4) which=may 'be of any suit-' able construction, that shown herein compris- 40 in the hopper flows downwardly through the opening at the bottom of the hopper to the apparatus associated therewith and from which the material-is withdrawn to a point of use, as will be described.

The cup base I4 is supported on the upper surface oia plate l6 (Figs. 1, 2, 3, and 4) which is preferably integral with a tubular member I'l beneath it, and the plate |6 and tubular member I are together supported upon legs |8 (Figs.

I 1 2, 3, and 4) the upper, bent ends of which (Fig. 4) are held against the plate |6 by studs l9 which also serve to secure the base M to the plate l6. The lower ends 01': the legs |8 are suitably secured to the top 20 of a table pro-.

ing Figs. 2 and 3) is a sleeve 24 (Figs. 3, 4 and provided adjacent one end with an opening 25 of substantially the same size as the vertical passage 23 and provided adjacent its center with a slot 26. The sleeve 24 forms a valve member cooperating with the cylindrical passage 22 Y and the vertical passage 23 to control the flow of material into the tubular member 11.

It is intended that the opening 25 in the sleeve 24 register with the vertical passage 23, as shown in Fig. 4, or be moved out of registry therewith.

,I'Eachieve this result, the left hand end portion 5| of the sleeve 24 (viewing Figs. 2, 3, and 5) is externally threaded so as to be received by and extend through one end of a lever 27 (best shown in Fig. 5) the opposite end of which is pivoted to a clevis 28 (Figs. 1 and 2) fromwhich depends a rod 29. The lower end of the rod 29 is provided with a clevis 36 which is pivotally secured adjacent a foot pedal. 3| on one end of a lever 32 the opposite end bf which is pivoted to a brace 33 carried by the table legs 2| at one side of the apparatus. A coil spring 34 one end oi. which is connected to a leg 2| and the other end of which is connected to the lever 32 urges the lever 32 upwardly, and a stop 35 (Figs. 1 and 2) carried by the same'leg 2| limits the up-v ward lever movement. In order to insure that the sleeve opening 25 be alignable with the vertical passage 23 upon rotation of the sleeve 24, the'cylindrical passage 22 is preferably slightly reduced in diameter beyond the sleeve, as shown in Fig. 8,-to provide a shoulder 36 which the end of the sleeve abuts.

With the above-described construction it will be seen that the sleeve 24 may be rotated in the a cylindrical passage 22 upon a swinging of the lever 32. The position of the sleeve 24 in the passa e 22 is such that when the pedal 3| and With the sleeve opening 25 in this last named position material flowing from the hopper l0 into the vertical passage 23 enters the sleeve 24, that is,enters the cylindrical passage 22. The sleeve opening 25 and the vertical passage 23 thus to-' gether form a passage providing a communication between the hopper l0 and the interior of the sleeve 24.

In order to insure that when the pedal 3| is depressed the sleeve opening 25 is in registry with the vertical passage 23, the top of the tubular member 11 is provided at its left hand end (viewing Figs. 2 and 3) with a stud 3'! which extends through the member I! and into the slot 26 in the sleeve 24. Upon rotation of the sleeve 24, that is, upon a movement of the sleeve lever 21 downwardly, the stud 31 abuts one end of the slot 26, as shown in Fig, 3, the slot being so positioned that the sleeve opening 25 and the vertical passage 23 register when the abutment of the stud 37 with the end of the slot 26 occurs. To the same end, namely, insuring the registry of the sleeve opening 25 with the vertical passage 23, and for the further purpose of locking the sleeve 24 in the cylindrical passage 22, the

shank of the stud 31 is substantially as wide as the slot 26. With this construction the sleeve 24 is held against movement longitudinally of the passage 22 and is always maintained in proper position for rotation.

It will be apparentin view of this stud 31 and slot. 26 construction that the slot could be given suchlength that upon rotation of the sleeve 24 in the opposite direction, that is, upon a movement of the sleeve lever 21 upwardly, the stud 31 could abut the other end of the slot 26, thereby limiting the rotation of the sleeve 24 and also limiting the upward movement of the lever 32. This mode of operation is to be avoided, however, even thoughit would render the stop 35 unnecessar'y,,for the sleeve 24 and its associated elements would ,be subjected to strain and possible injury resulting from the upward pull of the spring 34, and this would be particularly true should an operatives foot slip from the pedal 3| accidentally. The stop 35 prevents this possibility of strain and injury.

It has been pointed out above that when the sleeve opening 25 and the vertical passage 23 are in registry, material flows from the hopper l0 into sage 22. In order to withdraw this material in the passage 22 to a point of use, the apparatus is provided with a blower 38 (Fig. 1) whichv may be of any well known construction suitable for the purpose. The inlet end of the blower 38 is connected by means of a suitablecoupling 39 (Figs. '2 and 3) to the discharge end 40 of the tubular member The'discharge end 4| of the blower 38 (Fig. 1) is connected to one end of a hose 42 the opposite end of which carries a suitable nozzle 43. Since the blower per se forms no part oi. my invention and may be any one of a number in commercial use, it is not deemed necessary to describe it further other than to'say that it is preferably electrically operated and may be mountedupon the table top by means of suitable legs 44.

Since the blower 38 is connected by means of the coupling 33 to the cylindrical passage 22, it will be seen that when the blower is in operation a current of air is set up within the passage 22, entraining any material that is in it and carrying the material through the blower and the hose 42 to a pointof discharge from thenozzle 43. Stated in another way, the sleeve 24, the cylindrical passage 22, the coupling 33, .the air passage in the blower 38, the hose 42, and the nozzle 43 together comprise in efiect-a conduit the 45 t .the sleeve 24, that is, into the cylindrical pasend of which is the nozzle 43. The blower 38 in operation creates a condition of unbalanced air pressure between the sleeve inlet and the nozzle outlet, thereby causing atmospheric air to enter the sleeve and travel in a material-entraining current -along this conduit and finally out the nozzle outlet so that 'the material is discharged for application to the work.

Referring again to Fig. 4, it will be seen that if the material in the hopper I6 passed directly into the vertical passage 23, the sleeve opening 25, and so into the sleeve 24, the -sleeve and the passage 22 might well become flooded with material, since the diameters of the open bottom of the hopper l0 and the vertical passage 23 are relatively large. Material such as non-fibrous flock, Cellophane flock, to cite one example, Would flow rather freely from the hopper into the passage 22 of the construction so far described, and would in many cases result in the discharge from the nozzle 43 containing alto-' gether too much material for.a given applying job. In order to prevent this result, the illustrated embodiment of the present invention is provided with means for regulating the amount of flock which passes from the hopper l0 into the vertical passage 23 and the sleeve 24.

To this end the plate I6 is provided with a channel 45 (Figs. 3 and 4) extending across the plate at right angles to the axis of the cylindrical passage 22. Mounted for sliding movement in the channel 45 is a slide 46, having a thickness substantially equal to that of the depth of the channel so that the. top of the slide and the top of the plate I6 lie substantially in a plane, as indicated in Figs. 1, 2, and 4. Referring to Figs. 3, 4, and 6 the slide 46 is provided with spaced flow openings A, B, and C herein shown as three in number merely for purposes of disclosure. These openings are of graduated sizes, as indicated, and upon movement of the slide 46 are adapted to be brought selectively beneath the centerof the opening in the'bottomof the hopper I0 and over the center of the vertical passage 23. InFig. 4 the opening C is shown in the position just described, and that the openings A and B may be so positioned upon movement to the left of the slide 46 will be apparent from inspection of Figs. 4 and 6.

In order to maintain any one of the openings 'A,,B, or C in proper position with respect to the opening at the bottom of the hopper and to the vertical passage 23, theslide 46 is also pro-- 'vided with three openings A|, B-|, and C|,

each of which is adapted upon movement of the slide '46 to register with an opening 41 (Fig. 4) formed in a boss 48 at one side of the plate I6 and be heldin registry by means of a stud 49 as shown in Fig. 4. By means of this construction, the efiective size of.the passagebetween the bottom of the hopper I0 and the interior of the sleeve 24 may be restricted as desired, permitting a relatively small amount of material to flow into the sleeve, a medium amount, or a relatively large amount. In Fig. 4 the flow openingC is the smallest of the-three shown, thereby permitting the flow of a relatively small amount of material. A depending lip 53 may be provided on the slide .46 to facilitate moving it.

In the operation of the apparatus described above it is intended that the blower 38 operate at a substantially uniform rate. This arrangement thus provides that a substantially uniform air current flows through the apparatus, and leaves the regulation of the amount of material discharged to the position of the slide 46. In the use of some materials, however, or in the application of materials to' some kinds of work, it may be desirable to cut down the velocity of the discharge from the nozzle, rendering it softer. This may be accomplished by cutting down the amount of air that can enter the inlet of the apparatus, that is, the sleeve 24.

To achieve this result, the open end 52 (Fig. 5) of the sleeve threaded portion 5| extending through the sleeve lever 21 is covered by an internally threaded cap 53, and at either side the 'turnedon the threaded portion 5| sothat all the openings 54 and 55 are exposed, in the operationv I of the blower 38 atmospheric air will enter these openings, as Well as the opening 56, and pass into the sleeve 24 in as large an amount as would be the case if the open end 52 of the sleeve por-= tion 5| were not provided with the cap 53'and the openings 54 and 55. When, however, it is desired to cut down the velocity of the material and air discharge from the nozzle 43, the cap 53 may beturned on the threaded portion 5| so as to partially or completely cover the openings 54 and 55, thereby reducing the amount 01' air entering the sleeve' 24 and producing a softer discharge from the nozzle 43. Inasmuch as the cap opening 56 is always uncovered, some air always enters the sleeve 24 during the operation of the blower 38, this provision being made s0 7 that theblower does not act against what in effect would be a passage having a blind end. Since the openings 54 and 55 when fully open. together with the opening 56, are at least the cross sectional area equivalent of the interior of the sleeve 24, it will be seen that in the specific embodiment of the invention shown, these open.

ings provide the real inlet for the conduit formed by the sleeve 24,-the cylindrical passage 22, the coupling 39, the passage in the blower 38, the hose 42, and the nozzle 43, and that the condition of unbalanced air pressure which the blower 38 sets up between the inlet and the outlet of he conduit is actually set upbetween the openings 54, 55, and 56 on. the one hand and the nozzles 43 on the other.

The above-described construction provides means-specifically, the sleeve 24 and associated parts-by which the flow of material from the hopper l0 into the conduit may be permitted or shut off while the blower 38 is in. continuous operation. -The above-described construction also provides meansspecifically, the slide 46 and associated elementsby which the amount of -material flowing into the conduit may be varied.

vertical passage 23 are in complete registry when th apparatus is in operation. But it will be apparent that by not depressing the pedal 3| completely, 1. e., by depressing the pedal only slightly so that the sleeve opening 25 is only partially in registry with the vertical passage 23, the efiective size'of the passage 23 is diminished, thereby producing an effect in diminishing the amount of material flowing into the conduit similar to that resulting from shifting the slide 46 so as to bring a smaller opening,'B or C, for example, if A is being used, beneath the opening in the bottom of the hopper It). In effect the fact that the sleeve 24 may be rotated to partially close the vertical passage 23 provides a substantial equivalent for the openings A, B, and C in the slide 46, and to pursue this matter further, it will be seen that while shifting the slide 46 to change the size of the slide opening beneath the hopper l provides a primary means for varying the amount of material entering the conduit, a partial depressing of the pedal 3| after the shifting of the slide 46 will provide a secondary means for varying the amount of flow of the material. These two flowTvarying means may be used independently, and when acting together can be utilized to provide a finer regulation of material flow than is the case of the slide 46 acting alone when the passage 23 is completely open. The foregoing statements have been made to show the possibilities of the disclosed form of the present invention. For most purposes, however, it will be found sufficient to control the amount of material flow merely by means of the slide 46. i

If the material to be applied by the illustrated embodiment of the present invention comprises non-fibrous materials which have relatively smooth surfaces and are relatively heavy as, for example, Cellophane flock, in many instances the material will flow through the slide openings A, B, or C, through the passage formed by the sleeve opening 25 and the vertical passage 23, and into the sleeve 24 in a continuous manner. To insure a. continuous flow, however, with all types of material, it is desirable that the material be caused to flow downwardly positively. A suitable way of insuring such .flow is to slightly agitate the material, thereby providing that particularly when the hopper I0 is full the weight of the material does not cause the material in the lower portion of the hopper to pack and bridge over the bottom openin preventing further flow.

To effect continuous material flow in this manner, the frusto-conical portion l2 of the hopper I0 may be provided exteriorly with a vibrator 51 (Figs. 1 and 2) of any well known construction. While this vibrator may be of the mechanically operated type, it is preferredto use an electrically operated vibrator, provided with the usual wiring 58 for connection with a source of electric current (not shown). By reason of the vibrator 51, the frusto-conical wall I2 is constantly vibrated, which vibration is transferred to the material in the lower portion of the hop per Illand causes it to continuously settle to the bottom thereof as fast as material flows into' the conduit through the slide 46.

'In the operation of 'the illustrated embodiment of the present invention, the particular nonflbrous flock or other material to be applied is placed in the hopper l0 and the blower 38 is supplied with electric current to set it in opera-' tion. A condition of unbalanced air pressure is thus set up through the conduit formed by the cap 53, the sleeve portions 5| and 24, the cylindrical passage 22, the coupling 39, the air passage through the blower 38, the hose 42 and the nozzle 43, resulting in a current of air flowing through the conduit'from the openings 54, 55, and 56 and discharging from the nozzle 43. During this operation no material is discharged because the pedal 3| is not depressed, the spring 34 serving to hold the lever 32, the rod 29, and

the sleeve lever 21 up so that the sleeve opening 25 is completely out of registry with the vertical passage 23 below the bottom of the hopper l0. Depending upon the' amount of material it is desired should enter the conduit, the position of the-slide 46 is adjusted to bring the appropriate opening A, B, or C beneath the hopper bottom and over the' vertical passage23. When these acts have been done, the apparatus is ready for the applying operation. To effect this, the operative depresses the pedal 3|, the abutment of the stud 31 with one end of the sleeve slot 26 limiting the downward movement of the pedal 3| and the lever 32. Since'depressing the pedal 3| causes the sleeve 24 to be rotated to bring the opening 25 into registrywith the vertical passage 23, material in the hopper thereupon drops by way of the slide opening A, B, or C as the case may be through the passage formed by the sleeve opening 25 and the vertical passage 23. When in the sleeve 24 the material is entrained by the current of air passing therethrough and is discharged from the nozzle 43. The flow of material from the nozzle 43 can be instantly shut ofi by releasing the pedal 3| without'shutting off the blower 38, and the continuous flow of the material from the hopper l0 into the conduit is assured regardless of its nature when the pedal 3| is depressed becausethe vibrator 51 agitates the material in the hopper and prevents it from,

bridging over the opening in the hopper bottom. When it is desired to vary the amount of material in the discharge, the slide 46 may be shifted to bring a larger or a smaller opening beneath the hopper bottom, and the amount of material in the discharge may also be varied by depressing the pedal 3| less than the full amount, thereby throwing the sleeve opening 25 only partially into registry with the vertical passage 23 to vary its efiective size. Should it be desired to give the discharge from the nozzle 43 a softer character, it is necessary merely to turn the cap 53 the desired amount, thereby partially or completely covering the openings 54 and 55 and so diminishing the amount of air that enters the conduit through the openings 54 and 55. The above-described apparatus provides a small, compact, and efficient apparatus for applying non-fibrous flocks, powder, comminuted or finely divided solid matter, or the like in an easily controlled manner, and since the cessation of material diseharge is not dependent upon'a shutting off of the blower 38, it will be seen that the conduit may be easily cleaned for use with different material by merely releasing the pedal 3| while the blower 38 remains in operation.

It will be clear to those skilled in; the art and with the general objects of the present invention in view, that changes may be made in the details of structure, the described and illustrated embodiment of the present invention being intended as an'exploitation of underlying essentials of the invention, the features of which are definitely stated in their true scope in the claims presented herewith.

What is claimed as new, is:

1. In an apparatus for applying material such as powder or flock, the combination with a container for the material, a conduit provided with an air inlet, an outlet, and a passage for the transfer of material from the container to the conduit, .means for creating a condition of unbalanced air pressure between the inlet and the .outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-tentraining current within the conduit and out the 2. In an apparatus for applying material such as powder or flock, the combination with a container for the material, a conduit provided with an air inlet, an outlet, and a passage for the transfer of material from the container to the conduit, and means for creating a condition of unbalanced air pressure between the inlet and the outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, of means rotatable about the longitudinal axis of the conduit to vary the amount of air entering the inlet.

3. In an apparatus for applying material such as powder or flock, the combination with a container for the material, a conduit provided with an air inlet, an outlet, and a passage for the transfer of material from the container to the conduit, and means for creating a condition of unbalanced air pressure between the inlet and the outlet of the conduit to cause atmospheric air to enter the inlet and travel in a materialentraining current within the conduit and out the outlet, of a member movable relatively to the passage and provided with openings of different sizes through any one of which, at the selection of the operator, the material flows on its way to the conduit for varying the amount of material entering the conduit.

4. In an apparatus for applying material such as powder or flock, the combination with a container for the material, a conduit provided with an air inlet, an outlet and a passage, said container having an opening aligned with said passage, and a portion of said conduit being movable relatively to the container and provided with an opening alignable with said passage for the transfer of material from the container to the conduit, and means for creating a condition of unbalanced air pressure between the inlet and outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, of means through which the material flows on its way to the passage for varying the amount of material entering the conduit. V

5. In an apparatus for applying material such as powder or flock, the combination with a container for the material, a conduit provided with an air inlet, an outlet and a passage, said container having an opening aligned with said passage, and a portion of said conduit being movable relatively to the container and provided with an opening alignable with said passage for the transfer of material from the container to the conduit, and means for creating a condition of unbalanced air pressure between the inlet and outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, of means forvarying the amount 0! material entering the conduit comprising a movable member having openings of different sizes selectively registrable with the aligned passage and container opening.

6. In an apparatus for applying material such as powder oreflock, the combination with a container for the material, a conduit provided with an air inlet, an outlet, and a passage communieating with the container for the transfer of material from the container to the conduit, means for creating a condition of unbalanced air pressure between, the inlet and the outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, and means having a portion mounted within the conduit for movement about its longitudinal axis for varying the eifective size of the passage, of means through which the material flows on its way to the passage for varying the amount of material entering the conduit.

7. In an apparatus for applying material such as'powder or flock, the combination with a container for the material, a conduit provided with an air inlet, an outlet, and a passage communicating with the container for the transfer of material from the container to the conduit, means for creating a condition of unbalanced air pressure between the inlet and the outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, and a valve through which said air current flows mounted for movement about the longitudinal axis of the conduit for varying the amount of material entering the conduit, of means through which the material flows on its way to the passage for varying the amount of material entering-the passage.

8. In an apparatus for applying material such as powder or flock, the combination with a container for the material, a conduitprovlded with an air inlet, an outlet, and a passage communicating with the container for the transfer of material from the container to the conduit, means for creating a condition of unbalanced air pressure between the inlet and outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and' out the outlet, and means exterior'of the container for varying the amount of material entering the passage, of means separate from the container and having a portion within the conduit for varying the efiective sizeof the passage.

9. In an apparatus for applying material such as powder or flock, the combination with a container-for the material, a conduit provided with an air inlet, an outlet, and'a passage communicating with the container for the transfer of material from the container to the conduit, means for creating a condition of unbalanced air pressure between the inlet and the outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, and means having a portion within the conduit for varying the effective size of the passage, of slidable means exterior of the container for varying the amount of material entering the passage.

10. In an apparatus for applying material such as powder or flock, the combination with a container for the material, a conduit provided with an'air inlet, an outlet, and a passage communicating with the container for the transfer of material from the containerto the conduit. means for creating a condition of unbalanced air pressure between the inlet and the outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, and means ex-' terior of the container for varying the amount of material entering the passage, of means mounted within the conduit for movement about its longitudinal axis for varying the effective size of the passage.

11. In an apparatus for applying material such as powder or flock, the combination with a container for the material, a conduit provided with an air inlet, an outlet, and a passage communicating with the containerfor the transfer of material from the container to'the conduit, means for creating a condition of unbalanced air pressure between the inlet and the outlet of the conduit to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, means exterior of the container and movable in one direction for varying the amount of material entering the passage, and means within the conduit and mov able in a different direction for varying the' efiective size of the passage of means for varying the amount of airentering the inlet.

12. In an apparatus for applying material such as powder or flock, the combination with acontainer for the material, a conduit provided with an air inlet, an outlet, and a passage communicating with the container for the transfer of the material from the container to the conduit, means for creating a condition of unbalanced air pressure between the inlet and the outlet of the container to cause atmospheric air to enter the inlet and travel in a material-entraining current within the conduit and out the outlet, and a valve through which'said air current flows mounted within the conduit for movement about its longi tudinal axis to vary the amount of material en tering the conduit, of means exterior of the container for varying the amount of material entering the passage.

13. In an apparatus for applying material such as powder or flock, the combination witha container for the material, a conduit provided with an air inlet, an outlet, and a passage communieating with the container for the transfer of the material from the container to the conduit, and means for creating a condition of unbalanced air pressure between the inlet and'the outlet of the conduit to cause atmospheric air to enter the inlet and .travel in .a material-entraining current within the conduit and out the outlet, of means for regulating the amount of material entering the conduit comprising primary'means for varying the amount of. material transferred to the passage and secondary means for varying the effective size of the passage.

14. In an apparatus for applying material such as powder or flock. the combination with a container for the material, a conduit provided with an air inlet, an outlet, and a passage communicating with the container for the transfer of material from the container to the conduit, means for creating a condition ofunbalanced air pressure between the inlet and the outlet of the conduit to cause atmospheric air to enter the inlet and travel-in a, material-entraining current within the conduit and. out the outlet, and a member movable relatively to the passage and provided with. openings of different sizes through which the material flows for selectively varying the amount of material entering the conduit, of means separate from said movable member for closing the passage to prevent material from entering the conduit.

WAYNE B. THOMPSON CERTIFICATE OF CORRECTION. Patent No. 2,220,921. November 12, 19ho.

WAYNE B. THOMPSON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, first column, lines LL? and 6b., claims 1; and 5, after the word "outlet" insert a comma; lines 5hand 72, same claims, before "outlet" insert the--; page 6, first column, line 26, claim 11, after "passage" insert a comma; line 52, claim 12, and second column, line 9, .claim 15, for transfer of the" read -transfer -of-,- first column, line 55-56, claim 12, for "container-Y read conduit--; and that the said Letters Patent should be read with this correction therein that the same may conform to-the record pfthe case in V the Patent Office.

Signed and. sealed this 17th day of December, A. D. 191 0.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents

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