US2741251A - Valve control - Google Patents

Description

H. L. LUTHER VALVE CONTROL April 10, 1956 4 Sheets-Sheet 1 Filed 001;. 8, 1951 FIG.

INVENTOR HERBERT L LUTHER 444 ATTORNEY H. L. LUTHER VALVE CONTROL April 10, 1956 4 Sheets-Sheet 2 Filed Oct. 8 1951 FIG. 2.

FIG. 3'.

INVENTOR HERBERT L. LUTHER BY I h;- ATTORNEY April 10, 1956 H. L. LUTHER 2,741,251

VALVE CONTROL Filed Oct. 8, 1951 4 Sheets-Sheet. 3

F G INVENTOR HERBERT L. LUTHER BY 4 4z 5.

ATTORNEY April 10, 1956 Filed Oct. 8, 1951 H. LUTHER 2,741,251

VALVE CONTROL 4 Sheets-Sheet 4 F I G 9 J83 a 9? "null!!! 92 93 9| 88 45 b V INVENTOR 90- HERBERT L. LUTHER 0 WA? 8 9 f i BY fmwzw L; .'J J2 ATTORNEY United States atent VALVE CQNTROL Herbert L. Luther, Elizabethton, Team, assignor to North American Rayon Corporation, New York, N. Y., a corporation of Delaware Application October 3, 1251, Serial No. 250,287 8 Claims. (Cl. 13449) This invention relates to apparatus for controlling liquid sprayers of the type adapted to be actuated by a mobile body carrying the material to be sprayed.

An object of this invention is to provide an improved liquid sprayer control.

Another object of this invention is to provide a controller for liquid valves adapted to be used for liquid sprayers or washers in which an unlimited time range operating cycle may be provided.

Still another object of this invention is to provide a remote control for operating liquid valves without the use of electrical or compressed air devices.

Still another object of this invention is to provide a controller for the liquid valve of a sprayer in which another operating cycle may be initiated even if the previous operating cycle was not completed.

Still another object of this invention is to provide an improved liquid valve controller adapted to be tripped by the vehicle carrying the material to be washed or sprayed.

Other and further objects of this invention will be apparent to those skilled in the art to which it relates from the following specification, claims and drawing.

In accordance with this invention there is provided an improved controller for liquid valves adapted to be used with sprayers or washers for spraying or washing the acid and salt olf of cars and spool holders attached thereto which are used in the manufacture of rayon and the like; The cars may be of the type employed in a monorail transportation system which is provided with suitable washing stations. When the valve controller employed in accordance with this invention is tripped by the car the operating cycle of the controller is initiated. Thereafter the valve in the water supply line is permitted to be opened by the water pressure of the supply so that water is fed to the Sprayers for spraying the car and material and fixtures brought to the washing station by the car. After a predetermined time the liquid valve controller causes the valve to close and interrupt the water supply.

Further details of this invention will be set forth in the following specification and drawing in which briefly:

Fig. 1 is a side view of an embodiment of this apparatus;

Fig. 2 is a top view of an embodiment of this appa ratus;

Fig. 3 is a detail view taken along the line 3-3 of Fig. 1;

Fig. 4 is a detail view of the valve controller tripping mechanism;

Fig. 5 is a front view of the mechanism shown in Fig.4;

Fig. 6 is a sectional view taken along the line 6-6 of- Fig. 4;

Fig. 7 is a sectional view taken along the line 7-7 of Fig. 4;

Fig. 8 is a detail sectional view of the valve and valve controller and 'ice Fig. 9 is a detail sectional view of the small relief valve employed in the controller shown in Fig. 8.

Referring to the drawing in detail there is shown in Fig. 1 a transportation car 10 employed for transporting spools or other fixtures or similar material 11 to be washed or sprayed. This car 10 is supported by wheels 12 which ride upon the monorail 13 and is illustrated in Fig. 1 between the spray nozzles or outlets 14 located in the spray booth or washing station 15 that is illustrated in fragmentary section. The car 10 and spool holders carried by it are in correct position to be sprayed just after the wheels 12 have passed under the shoes 50 as will be described hereinafter. The spray nozzles are preferably arranged with a plurality thereof on each side of the car 10 and these are connected to suitable headers 16, one of which is positioned on each of the lateral sides of the spray booth 15 as shown in Fig. 2. The headers 16 are connected to pipes 17 which in turn are connected to the supply pipe 18 and to the outlet of the valve 19.

The valve 19 is connected to the valve controller 20 by the tube 21. The bottom of the controller casing is which is bolted to the top of the upright member 25.

The bottom of the upright member 25 is welded to the center of the monorail 13 so as not to interfere with the passage of the wheels 12 of the car 10. A suitable bracket 23 extends to the side of the right angle bracket 22 and is attached thereto by welding. The bracket 23 is attached by means of the U-shaped member 26 to the supply pipe 18 entering the outlet port of the valve 19 as shown in Figs. 1 and 4. Of course in cases where the valve controller 26 is located at a point remote from the valve 19 the bracket 23 would be supported independently.

The upright member 25 is provided with a vertically extending slot 27 for receiving the bolt 28. This bolt 28 is provided with a bearing sleeve 29 which movably fits into the slot 27 as shown in the detail sectional view Fig. 7.

The bolt 28 passes through the bars 30, through the slots 31 formed in the clevis 32 and through the slot 27 of the upright member 25. This bolt 28 functions to hold the clevis 32 and the bars 30 in assembled relation. When the bars 39 are in their lower position the bolt 28 rests in the bottom of the slot 27 and also in the bottoms of the slots 31. The slots 31 are shorter than the slot 27 so that as the bars 36 are moved upward by the car wheels 12 the clevis 32 is lifted from its support at the top of the member 25 when the bolt 28 reaches the top of the slots 31 as will be described hereinafter in the operation of this device.

The rod 33 is provided with a head 34 held in the socket 35 that is attached to the top of the clevis 32 by the bolts 36. The top portion of this rod 33 is slidable in the sleeve 37 that is attached by welding or in any other suitable manner to the bottom of the bracket 22. The top of the rod 33 is pivotally attached to the lower end of the rod 38 by the pin 39. The rod 38 is provided with a counterweight 40 which extends through a slot formed in the bracket 22, as shown in Fig. 6, and

is arranged to maintain the head 41, provided at the upper end of this rod, in slidable contact with the bracket of the controller 20 for the cavity 74 of the valve controller 7 20 is also provided the purpose of spring biasing the rod 45 for normally maintaining this rod projecting a given length from the controller bottom. 7

The bars 39 have the ends Lhereof provided with downwardly extending members '49 and each of thesemembers is provided with .a shoe 59 attached thereto by suitable bolts. Suitable flat upright members 49a extending -up ward through slots formed in the shoes 50, are welded to the top of the rail 13 to function as guides for these shoes and keep them aligned with the rail 13 as shown in Fig. 2. The shoes are engaged by the wheels 12 of the car when the car is moved into the spray booth 15 so that the bars are lifted a predetermined distance when both of the shoes are directly over the corresponding wheels 12. At this position the bars 30 function to move the clevis 32 and the rods 33, 38 and 44 upward sufliciently to trip the valve controller 20 as will be described in detail hereinafter. I

The valve 19 and valve controller 20 are shown in detail in Figs. :8 and '9. In general the valve 19 is constructed as shown in U. S. Patent 'No. 1,714,573 issued to W. E. Sloan. However, the control of the valve 19 is entirely different from the manual control shown in this patent, The inlet port 51 of the valve 19 is connected to the water supply pipe 52 and water is passed through the valve 1-9 and through the outlet port 53 thereof to the pipe 18 when the diaphragm 54, which is clamped between the shoulder-55 and the periphery of the cap 56, is in its open position. When this diaphragm 54 is in its closed position, that is, when his pressed against the upper, edge 57 of 'the circular wall member 58, water is prevented from flowing through the valve.

The diaphragm 54 is provided with a small port 59 which connects the inlet channel 60 with the cavity61 in back of the diaphragm 54-. This port 59 permits Water to flow from the inlet channel 69 into the cavity 61 to fill up this cavity and to equalize the pressure in the cavity 61, tube "21 and in thehousing of the controller 20 with that in the channel 58. Water also flows from the cavity 61'through the tube 62 which is threaded into the top of the cap 56, and through the tube 21 connected to the top of the tube 62 into the casing of the valve controller 20. The bottom of the tube 62 is provided with a slot 62a to prevent the end of this tube from being closed when the valve cap 66 is in its uppermost position.

The central partjof the diaphragm 54 is clamped be.-

tween the parts 63 and 64 by means of the threaded member 65, cap 66, bolt 67 and washer 68. The body portion of the member 64 projects down into the tubular member 58 and is provided with guiding'wings 69-located at intervals around the circumference'thereof.

The valve controller 29 is connected to the valve by the tube 21 which is coupled to the upper cap 70 of the.

valve controller by means of the fitting 7.1 thatis threaded into the top of the cap 76 and into the coupling 7 2 of 4 diameter of the tubular member 79 so as to provide'an air passage therebetween for venting of the device and a pair of holes 79a are also provided to the tubular member 79. These holes are positioned so as to clear the bottom surface of the cap 79 in order to properly vent the inside of the controller chamber.

The body portion of the valve controller 20 consists of a pipe threaded at the top to receive thethreaded cap 70 and also threaded at the bottom to receive the threaded bottom 83. The bottom 83 is provided with a sleeve 84 which functions as a bearing for the rod 45. This rod is made with a shoulder 85 for engaging the top .of the sleeve 84 to prevent the rod from being pushed all the way out of the valve controller 20 by the spring 48. The top portion of the rod 45 is of substantially reduced cross section to engage the pin 86 of the small relief valve 87 that is positioned on the top of the float valve'88.

The relief valve 87 is shown in substantially enlarged cross section in Fig. 9 and consists of a bottom spider member 89, a spring 90, bushing 99a with radially disposed Wings 90b and a top cap member 91 all of which are held together by the centrally disposed rivet 92 which extends from the cap 91 through the member 89. The cap 91 includes an innerrmember' 93 attached thereto for holding a resilient sealing member 94 therein. The seal retaining member 93 is also held assembled with the other 7 parts of the valve by the rivet 92.

The relief valve 87 is positioned in a small opening at the top of the float valve 88 and when this relief valve 87 is opened by the rod 45 to open the passage between the sealing ring 94 and the top surface of the float valve 88, the bottom edge of the float valve 88 is in contact v withthe top surface of the ring 95 that isheld in a cavity the tube 21. An orifice plug 73 is positioned inside of the ,fitting 71 to control the rate at which water flows'into The top '70 or" the valve controller with a vent and vacuum brake which consists of a tube 75 coupled to the top 71 by means of suitable fittings 7,6.

This tube 75 is connected to a small valve controlled cavity 77 formed in the top 7% The top of this cavity is provided with a rubber valve seat 73 having a hole in the center thereof in alignment with the opening to the tube 75.. This rubber valve seat 78 is held in place by bottom 82 thereof is'spaced from the valve seat 78 so as to open the inlet to the tube 75. The valve member .81 has an outside diameter somewhat smaller than the inside i formidin the bottom cap 83. The top peripheral'edge of the ring 95 is engaged by the bottom edge ,of the tubular body member of the controller 20 to hold this ring in place. The hole 96 formed in the center of the ring 95 is made large enough to clear the flange 85 and the top of the bushing 84 so'as to provide a passage from the inside of the float valve 88 to the channel 97 formed in the bottom capes, This channel 97 is connected to the drain pipe 98 shown in Fig. 2. A plurality of rods '99 are fitted into spaced holes formed in the ring 95 and these rodsrare provided with nuts 109 at the tops thereof for holding the sheet metal covering 191 on the top .of the sheet metal can 102 which surrounds the rods 99 and the float valve 88..v The bottom edge of the sheet metal can 102 also engages .the top of the ring 95 and portions of the bottom of sheet metal can 102 are cut away to provide a plurality of small ho les 103 at the bottom of the can. The purpose of this can 102 and ,thercover 101 attached thereto is to provide a closure over the'float valve 88 and to limit the upward movement of this float valve.

The operation of this apparatus is as follows. When the car 10 is moved into the spraying station 15 the wheels 12 engage the shoes 50 of the bars 30 and lift these bars. It is .obvious that when the car 10 is moved into this station 15 the forward wheel 12 will engage the first shoe 50 of the'bars 3.0 and raise one end of these bars.

are of just sufficient length so that when only one end of the bars 30 is lifted by the forward wheels 12, for example, the bolt 28 of these bars slides in the slots 31 and the valve controller rods are not actuated or lifted. However, when both the forward and rear wheels 12 of the car '10 are under the respective shoes 50 of the bars 30, these bars are lifted to a greater height and the bolt 28 engages the top surfaces of the slots '31 thus lifting the clevis 32 and the valve controller actuating rods 33, 38, 44 and 45 so that the top end of the rod 45 first opens the small relief valve 87 in the float:

valve 88 and thereafter raises the float valve 88.

assumed that the diaphragm 54 of the valve 19 is in its closed position and that the cavity 61 above the diaphragm 54 as well as the c21 ity 74 are full of water or any other liquid that is to be used in this apparatus. Inasmuch as the cavity 61 is connected to the supply channel 60 in the valve 19 through the small opening 59, the fluid pressure on both sides of the diaphragm 54 will be equalized. Liquid also fills that cavity 74 of the controller 20 with the exception of the thimble 81 of the vacuum brake valve, which is partially filled with air and therefore floats on the liquid in the cavity 74 and is pressed against the valve seat 78 so as to close the vacuum brake valve.

As previously mentioned, the rod 45 opens the small relief valve 87 in the fioat'valve 88 when the car is brought into the washing station 15. Opening the small relief valve 87 allows a small amount of water to pass therethrough into the air space in the float valve 88, which is resting under pressure on the ring 95, and as a result the pressure in the cavity 74 of the controller 20 practically instantaneously drops to almost atmospheric pressure since the channel 97 is connected to the open drain pipe 98. After the pressure is released, the spring 90 in the relief valve 87, being quite strong, cause .the float valve 88 to rise up against the seat ring 94. The float valve 88 after being lifted off its seat on the ring 95 by the combined action of the relief valve spring 90 and the rod 45 remains afloat in the liquid in the cavity 74 because of the buoyancy of the air trapped'within the body of this float valve, .until the water level in the cavity 74 of the controller drops to the point where the float valve 88 may again come to rest on its seat on the ring 95 at which time the cavity 74 of the controller 20 again begins to be filled with water from the valve 19 through the orifice 59 in the diaphragm 54 and through the tube 21.

When the float valve 88 is first lifted off from its seat the water in the controller cavity 74 begins to escape .throughthe holes 103 formed in the bottom of the can 102, through the port 96, the channel 97 and the drain pipe 98. At the same time air is admitted into the cavity 74 through the vacuum brake valve at the top of this cavityand through the pipe 75 because the thimble 81 opens this vacuum brake valve. If desired, additional holes may be formed into the can 102 and the cover 101 thereof to augment the holes 103.

When'the car is moved into the washing station and the Wheels 12 engage the respective shoes 50 so as to lift both ends of the bars 39 a sufficient height so that these bars lift the clevis 32 and the rods 33, 38, 44 and 45 to open the relief valve 87 that is positioned on the float valve 88, the pressure in the cavity 74 drops quickly toalmost atmospheric pressure as described above.

Since the cavity 74 is connected to the cavity 61 of the valve "19 through the tube 21, the pressure in the cavity 61 also drops quickly and as a result the water pressure in the channel raises the diaphragm 54 from its seat on the upper lip of the wall 57 and water is allowed to pass through the valve 19 to the pipes 18, 17 and 16 and out of the spray outlets 14 to spray the material 11 on the car 10. This spraying action goes on while the water from the cavity 74 is being drained out through the channels 96 and 97 and the drain pipe 98. When the cavity 74 has drained sufiiciently to permit the fioat'valve 88, which is substantially filled with air, to come to rest on the upper surface of the ring 95, this float valve 88 closes the liquid exit through the channels 96 and 97.: When the exit channel 96 is closed by the float valve 88 the cavity 74 again begins to be filled with liquid fiowing thereto through the tube 21 from the cavity 61 which inturn receives the liquid from the Water channel 60 through the orifice 59. During this time ,whenthe cavity 74.is being filled the diaphragm 54 is in ,its open position and remains in its open position until .the cavities 61 and 74 and the connecting tubing 21.are

filled with fluid. During this time the material 11 on the car 10 is being sprayed. It is therefore seen that the volume of these cavities 61 and 74 and the connecting tubing control the time during which the spray is on. Furthermore, the rapidity or rate with which the cavity 74 is filled also determines the time that the spray is on. Consequently this time may be varied by varying the size of the orifice opening in the tube 73 that is inserted into the coupling 71, a small orifice opening being employed where a long time interval is desired and a larger opening being employed Where a short time interval is desired. The orifice in the tube 73 also functions to insure smoother operation of the valve 19. Furthermore, this orifice also prevents too much air from being pushed out of the float valve 88 when the relief valve 87 is opened by the rod 45.

The volume of the cavity 74 may be changed by lengthening or decreasing the length of the pipe forming this cavity in order to control this time interval. For this purpose the tube forming this cavity may be made in two or more telescoping parts movable with respect to each other and sealed to form a liquid tight body so that the volume of this cavity may be varied at will.

As previously described, bars 30 are lifted by the wheels 12 of the car 10 and this action lifts the rods 33, 38, 44 and 45 to trip the valve controller 20. In order to render the operation of this apparatus substantially foolproof and to permit the valve 19 to be closed at the end of the predetermined time interval even if the car is left in the spray booth 15 with the Wheels 12 holding the bars 30 in raised position, there is provided to this invention a cam surface 42 which contacts the head 41 of the rod 38 as this rod is moved upward. During a portion of the movement upward of the rod 38, the head 41 engages the bottom of the rod 44. However, when the rod 38 is near the upper extent of its upward motion the cam 42 causes the head 41 to be disengaged from the bottom of the rod 44. Thus at this time the rod 44 is free to drop to its lowermost position by its own weight. At the lowermost position of the rod 44 the fiange at the top thereof rest on the top of the sleeve 43. When the car 10 is moved away so that the bars 30 may drop to their lowermost position this rod 38 will also drop and because of the counter weight 40 attached to this rod, the head 41 will be brought into position underneath the bottom of the rod 44.

While in the operation of this invention reference Was made to the use of water as the liquid used to spray the material 11 on the car 10, it is of course obvious that other liquids and solutions may be used for spraying, washing, impregnating or treating this material.

It is of course obvious that various modifications may be made in this invention and therefore I do not desire to limit this invention to the exact details described and illustrated except in so far as they are defined by the claims.

What I claim is as follows:

1. In apparatus for controlling liquid sprayers the combination of a carrier for carrying the material to be sprayed, Wheels for said carrier, spraying means for spraying said material, means for moving said carrier into position opposite said spraying means for spraying said material, a valve connected to said spraying means for controlling the supply of spraying fluid thereto, said valve having a diaphragm and a cavity above said diaphragm, said diaphragm having an orifice therein to permit the fluid pressure on both sides of said diaphragm to be equalized, a tube connected to said cavity, a second cavity connected to said first cavity through said tube so that said second cavity is also filled with fluid, auxiliary valve means in said second cavity, a rod positioned in the bottom of said second cavity, means for controlling the building up of pressure in said cavities to permit said valve to remain open for a predetermined time interval after said auxiliary valve means is closed, means actuated by said carrier for anneal actuating said rod when said carrier is moved into said position, said means actuated by said carrier comprising a bar, means for engaging said wheels of said carrier for lifting said bar, means actuated by said bar for lifting said rod to open said auxiliary valve means to reduce the pressure in both of said cavities and permit said valve to open, and means for disengaging said last mentioned means from said red when said rod has been actuated.

2. In apparatus for controlling liquid sprayers the combination of a carrier for carrying the material to be sprayed, spraying means for spraying said material, means for moving said carrier into position opposite said spraying means for spraying said material, a valve connected to said spraying means for controlling the supply of spraying fiuid thereto, said valve having a diaphragm and a cavity above said diaphragm, said diaphragm having an. orifice therein to permit the fluid pressure on both sides of said diaphragm to be equalized, a tube connected to said cavity, a second cavity connected to said first cavity through said tube so that said second cavity is also filled with fluid, auxiliary valve means in said second cavity, a rod positioned in the bottom of said second cavity, means for controlling the building up of pressure in said cavities to permit said valve to remain open for a predetermined time interval after said auxiliary valve means is closed, means actuated by said carrier for actuating said rod when said carrier is moved into said position, said auxiliary valve means comprising a float valve positioned in the bottom of said second cavity and a relief valve positioned in the top of said float valve, said relief valve being adapted to be opened by said rod to reduce the pressure in both of said cavities and permit the said first mentioned valve to open.

3. In apparatus for controlling liquid sprayers the combination of a carrier for carrying the material to be sprayed, spraying means for spraying said material, means for moving said carrier into position opposite said spraying means for spraying said material, a valve connected to said spraying means for controlling the supply of spraying fluid thereto, said valve having a diaphragm and a cav'ity above said diaphragm, said diaphragm having an orifice therein to permit the fluid pressure on both sides of said diaphragm to be equalized, a tube connected-to said cavity, a second cavity connected to said first cavity through said tube so that said second cavity is also filled with fluid, auxiliary valve means in said second cavity,

a rod positioned in the bottom of said second cavity for opening said auxiliary valve means, means for controlling the building up of pressure in said cavities to permit said valve to remain open for a predetermined time interval after said auxiliary valve means is closed, means actuated by said carrier for actuating said rod when said carrier is moved into said position, and a vacuum brake valve positioned at the top of said second cavity, said vacuum brake valve being adapted to be opened when said auxiliary valve 7 means is opened to permit air to enter said second cavity.

4. In apparatus for controlling liquid sprayers the combination of a carrier for carrying the material to be sprayed, spraying means for spraying said material, means for moving said carrier into position opposite said spraying means for spraying said material, a valve connected to said spraying means for controlling the supply of spraying fluid thereto, said valve having a diaphragm and a cavity above said diaphragm, said diaphragm having an orifice therein to permit the fluid pressure on both sides of said diaphragm to be equalized, a tube connected to said cavity, a second cavity connected to said first cavity through said tube so that second cavity is also filled with fluid, auxiliary valve means in said second cavity, a rod positioned in the bottom of said second cavity, means for controlling the building up of pressure in said cavities to permit said valve to remain open for a predetermined time interval after said auxiliary valve means is closed, means actuated by said carrier-for actuating said rod when said carrier is moved into said position, said auxiliary valve means comprising a 'float valve positioned in the bottom of said sec- 'ond cavity and a relief valve adapted to be opened by said rod to reduce the pressure in both of said cavities and permit said first mentioned valve to open, said relief valve being positioned at the top of said float valve, and a cage positioned around said'float valve to limitthe motion thereof. a i

5. In apparatus for controlling liquid sprayers the combinationof a carrier for carrying-the material to be sprayed, spraying means for spraying said material, means for moving said carrier into position opposite said spraying means for spraying said material, a valve connected to said spraying means for controlling the supply of spraying fluid thereto, said valve having a diaphragm and a cavity above said diaphragm, said diaphragm having an orifice therein to permit the fluid pressure on both sides or" said diaphragm to be equalized, a tubeconnected to said cavity, a second cavity connected to said first cavity through said tube so that said second cavity-is also filled with fluid, auxiliary valve means in said second cavity, a rod positioned in the bottom of said second cavityfor opening said auxiliary valve means, means for controlling the building up of pressure in said cavities to permit said valve to remain open for a predetermined time interval after said auxiliary valve means is closed, means actuated by said carrier for actuating said rod when said carrier is moved into said position, said last mentioned means actuating said ro sufiiciently to open said auxiliary valve means only when said carrier is in a predetermined position with respect to said spraying means, and means'for releasing said rod from engagement by said last mentioned means after said auxiliary valve means is opened.

6. In apparatus for controlling liquid sprayers the combination of a carrier for carrying the material to be sprayed, wheels for said carrier, spraying means for spraying said material, means for moving said carrier into position opposite said spraying means for spraying said material, a valve connected to said spraying means for controlling the supply of spraying fluid thereto, said valve having a diaphragm and acavity above said diaphragm,

said diaphragm having an orifice therein to permit the fluid pressure on both sides of said diaphragmto be equalized, a tube connected to said cavity, a second cavity'connected to said first cavity through said tube so that said second cavity is also filled with fluid, auxiliary valve means in said second cavity,'a rod positioned in the bottom of said second cavity for opening said auxiliary valve means, means ,for' controlling the building up of pressure in said cavities to permit said valve to remain open for a predetermined time interval after said auxiliary valve means is closed, means actuated by said carrier for actuating said rod whensaid carrier is moved into said position, said means actuated by said carrier comprisinga bar adapted to be lifted by said wheels of said'carrier and means for linking said bar to said rod, said last mentioned means having means for sufficiently actuating said rod for opening said auxiliary valve means only when said carrier is in a predeterminedposition with respect .to said spraying means.

7. In apparatus for controlling liquid sprayers the combination of a carrier for carrying the material to be sprayed, wheels for said carrier, spraying means for spraying said material, means for moving said carrieruinto position opposite "said spraying means for spraying said material, a valve connected to said spraying means for controlling the supply of spraying fluid thereto, said valve having a diaphragm and a cavity above said diaphragm, said diaphragm having an orifice therein to permit the fluid pressure on both sides of said diaphragm to be equalized, a tube connected to said cavity, a second cavity connected to said first cavity-through said tube so that said second cavity is also filled with fluiiauxiliary valve means in said second cavity, a rod positioned in the bottom of said second cavity for opening said auxilia'ry valve means, means for controlling the building up of pressure in said cavities LO permit said valve to remain open for a predetermined time interval after said auxiliary valve means is closed, means actuated by said carrier for actuating said rod when said carrier is moved into said position, said means actuated by said carrier comprising a bar adapted to be lifted by said wheels of said carrier and means for linking said bar to said rod, said last mentioned means comprising linkage for sufficiently actuating said rod for opening said auxiliary valve means only when said carrier is in a predetermined position with respect to said spraying means, said linkage including a pivoted member, a cam for engaging said pivoted member and for pushing said pivoted member out of engagement with said rod after said rod has been actuated.

8. In apparatus for controlling liquid sprayers the combination of a carrier for carrying the material to be sprayed, said car ier having a pair of Wheels spaced from each other, spraying means for spraying said material, means for moving said carrier into position opposite said spraying means for spraying said material, and means actuated by said Wheels or" said carrier for initiating the spraying of said material, said pair of wheels of said carrier being spaced apart by a distance equal substantially to the of said carrier, said means actuated by said wheels comprising a bar having shoes on each end thereof for engaging said wheels, said last mentioned means being adapted to prevent the operation thereof to initiate the said spraying unless said shoes on the ends of said bar are each engaged by a difierent one of said pair of wheels.

UNITED STATES PATENTS

Claims (1)

1. IN APPARATUS FOR CONTROLLING LIQUID SPRAYERS THE COMBINATION OF A CARRIER FOR CARRYING THE MATERIAL TO BE SPRAYED, WHEELS FOR CARRIER, SPRAYING MEANS FOR SPRAYING SAID MATERIAL, MEANS FOR MOVING SAID CARRIER INTO POSITION OPPOSITE SAID SPRAYING MEANS FOR SPRAYING SAID MATERIAL, A VALVE CONNECTED TO SAID SPRAYING MEANS FOR CONTROLLING THE SUPPLY OF SPRAYING FLUID THERETO, SAID VALVE HAVING A DIAPHRAGM AND A CAVITY ABOVE SAID DIAPHRAGM, SAID DIAPHRAGM HAVING AN ORIFICE THEREIN TO PERMIT THE FLUID PRESSURE ON BOTH SIDES OF SAID DIAPHRAGM TO BE EQUALIZED, A TUBE CONNECTED TO SAID CAVITY, A SECOND CAVITY CONNECTED TO SAID FIRST CAVITY THROUGH SAID TUBE SO THAT SAID SECOND CAVITY IS ALSO FILLED WITH FLUID, AUXILIARY VALVE MEANS IN SAID SECOND CAVITY, A ROD POSITIONED IN THE BOTTOM OF SAID SECOND CAVITY, MEANS FOR CONTROLLING THE BUILDING UP OF PRESSURE IN SAID CAVITIES TO PERMIT SAID VALVE TO REMAIN OPEN FOR A PREDETERMINED TIME INTERVAL AFTER SAID AUXILIARY VALVE MEANS IS CLOSED, MEANS ACTUATED BY SAID CARRIER FOR ACTUATING SAID ROD WHEN SAID CARRIER IS MOVED INTO SAID POSITION, SAID MEANS ACTUATED BY SAID CARRIER COMPRISING A BAR, MEANS FOR ENGAGING SAID WHEELS OF SAID CARRIER FOR LIFTING SAID BAR, MEANS ACTUATED BY SAID BAR FOR LIFTING SAID ROD TO OPEN SAID AUXILIARY VALVE MEANS TO REDUCE THE PRESSURE IN BOTH OF SAID CAVITIES AND PERMIT SAID VALVE TO OPEN, AND MEANS FOR DISENGAGING SAID LAST MENTIONED MEANS FROM SAID ROD WHEN SAID ROD HAS BBEN ACTUATED.

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