US2110534A - Soot blower - Google Patents

Description

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N. L. SNOW El' AL SOOT BLOWER Filed nec. 27, 19:52

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March 8, 1938. N. L, sNow ET A1.

SOOT BLOWER Filed Dec. 27, 1932 B Sheets-Sheet 2 n $5 1v d; G

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SOOT BLOWER Filed Dec. 27, i932 8 sheets-sheet s w ....Hl 0r f March 8, 1938.

N. L. sNow ET AL v 2,110,534

sooT BLOWER Filed D80. 27, 1952 8 sheet/s sheet 4 prank owffr: wm IMM/m WMM/ SOOT BLOWER Filed Deo. 2'7. 1932 8 Sheets-Sheet 5 March 8, 1938. N. l.. SNOW ET A1.

SOOT BLOWER Filed DeG. 27, 1932 8 Sheets-Sheet 6 March 8, 1938. Nl SNOW `ET AL l .2,110,534

SOOT BLOWER Filed Deo. 27, 1952 8 Sheets-Sheet '7 March s, 193s. N L, SNOW ET AL 2,1103534 soo'r BLOWER Filed Dec. 27, 1952 8 Sheets-Sheet 8 u l .U i Mmmm [gli van( Bower.;

mesita vNaas, lass PATENT ori-ica 2.110.534 soo'r Bmwaa Norman L. Snow. New Canaan, Conn., and Willis' P. Thomas, Highland Park, Harry E. Brelsfcrd, Birmingham. and Curtis L. Howse `and Frank Bowers, Detroit, Mich., assignors tc Diamond Power Specialty Corporation, Detroit, Mich., a corporation of Michigan Application December 27, 1982, Serial No. 849,109

I 23 Claims.

This invention relates to a fluid heater cleaner of the character in which a blower element is arranged to discharge cleaning fluid adjacent portionsof a fluid heater to be cleaned.

One of the primary objects of this invention is to provide a fluid heater cleaner of the above mentioned character which will include means for initiating the operation of the cleaner and means for terminating the actuation of the cleaner after a predetermined desired operation thereof.

The invention further contemplates the provision of means whereby the extent of operation of the cleaner may be varied at the will of the operator to the end that the cleaner may be caused to operate for s'hort or long periods of time as desired.

The above and numerous other objects and advantages of this invention will become more apparent as the following description proceeds, particularly when reference is had to the accompanying drawings, wherein:

Fig. 1 is a longitudinal sectional view through a blower head constructed in accordance with the teachings of this invention;

Fig. 2 is a sectional view taken substantially on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary sectional view taken substantially on the line 3 4 of Fig. 1;

Fig. 4 is a fragmentary sectional view similar tovFig. l showing a slightly modified form ci construction;

Fig. 5 is a view similar to Fig. 4 showing the parts of the construction in one of the positions which they assume during a portion of the operation of the construction;

Fig. 6 is a sectional view taken substantially on the line 6--6 of Fig. 5;

Fig. 'l is a perspective view with parts broken away of a slightly modified form of control mechanism;

Fig. 8 is a longitudinal sectional view through a portion of the structure shown in Fig. 7

Fig.` 9 is an enlarged sectional viewn through a portion of thestructure shown in Fig. 8;

Fig. 10 is an end elevational view partly in section of a further modified form of construction;

Fig. 11 is a sectional view taken substantially on the line ii--ll of Fig. l0;`

Fig. 12 is a view similar to Fig. 10 showing a further modified form of construction;

Fig. 13 is a side elevational View of a portion of the structure shown in Fig. 1.2;

Fig. 14 is a fragmentary sectional view taken substantially on the line il-il of Fig. 12;

Fig. 15 is a detail perspective view of one of the elements forming a part of the structure shown in Fig. 12;

Fig. 16 is a diagrammatic view of a fluid heater showing a plurality of cleaners associated with the same and a modified means for controlling these cleaners;

Fig. 17 is a fragmentary and elevational view of the structure shown in Fig. 16;

Fig. 18 is a perspective view of a central control means for a plurality of blowers;

Fig. 19 is a semi-diagrammatic sectional view showing a further modified form of control means;

Fig. 20 is a sectional view taken substantially on the line 2li- 20 of Fig. 19;

Fig. 21 is a view similar to Fig. 19 showing a further embodiment of the control mechanism;

Fig. 22 is a view similar to Fig. 19 showing a further modified form of the invention;

Fig. 23 is a sectional view through a portion of the structure shown in Fig. 22;

Fig. 24 is a view similar to Fig. 19 showing a further embodiment of the inventive idea;

Fig. 25 is an enlarged elevational view of a portion of the structure shown in Fig. 24; and

Fig. 26 is a detail end elevational view of the structure shown in Fig. 25.

Referring then particularly to the drawings wherein like reference characters designate corresponding parts throughout all views, there is shown in Fig. 1 a blower element 25 which, it will be understood, extends into a iluid heater (not shown) and is provided with a suitable nozzle or nozzles (not shown) for discharging cleaning fluid adjacent the portions of the fluid heater to be cleaned. The blower element is journaled in a head designated generally by the reference character 26,'1this head including means forrotating or oscillating the blower element, means for controlling the admission of cleaning uid to the blower element, and means for controlling the extent of operation .of the blower element, as will hereinafter be more fully described. l

'I'he head comprises a housing 21 which may be suitably mounted, if desired, on the wall of the fluid heater cleaner in any desired manner-(not shown). A cover 28 closes one side of the `housing 21, and this cover carries a bushing 29 which provides a bearing for the end of the blower element 25. The cover plate also receives one end of a sealing bushing 30 which is carried in a valve housing designated generally by the reference character 3|. This valve housing provides a cleaning fluid inlet passage 32 to which a source oi' supply of cleaning iluid may be connected in any desired manner.

The mechanism for rotating the blower element comprises a gear 35 fixed as by a set screw or the like 36 to the blower element. Engaging this gear is a pinion 31 which is journaled on a shaft 38 mounted in the housing 21. Mounted on the hub of pinion 31 and ilxed thereto is a ratchet wheel 39 so that upon rotation of this ratchet wheel the pinion 31 is rotated. thus driving the gear 35 and blower element 25.

Formed in caps secured to the housing 21 are cylinders 40 and 4|. These cylinders are aligned, and mounted inthe same are pistons 42 and 43, these pistons being connected by a yoke 44. The yoke is provided with a slot 45 through which the shaft 36 extends, so that the pistons may reciprocate in their respective cylinders and impart reciprocatory movement to the yoke.

Pivotally secured to the yoke 44 are pawls 46 and 41, and springs associated with these pawls constantly urge the same into engagement with the ratchet wheel 39. The pawl 46 is mounted above the longitudinal axis of the yoke 44, while the pawl 41 is mounted below 'the longitudinal axis of this yoke. The arrangement is such that as the yoke is moved to the left, as viewed in Fig. 2 of the drawings, counter-clockwise movement is imparted to ratchet wheel 39 by pawl 46, the pawl 41 idling over the teeth of the ratchet wheel during this movement. Upon reverse movement of the yoke or movement thereof tof' ward the right, as viewed in Fig. 2, pawl 41 imparts counter-clockwise movement to the ratchet wheel 39, pawl 43 idling over the teeth of the ratchet wheel during this movement of the yoke. Thus it will be apparent that reciprocation of the pistons 42 and 43 and thus of the yoke drives the ratchet wheel 39 continuously in one direction and thus the blower element 25.

For admitting fluid under pressure to the cylinders 46 and 4| to thus eilect a reciprocation oi.' the pistons in these cylinders, there is provided a valve 50 mounted for reciprocation in a valve chamber 5| formed in the lower end of the housing 21. The valve member comprises an elongated tubular member providing a central passage 52. The valve member is provided on its outer periphery and adjacent its ends with the relatively wide A annularl channels 53 and 54.

Fluid under pressure is supplied to chamber 5| by a conduit 55, this conduit discharging the fluid into one end of the chamber. When the valve is in the position shown in Fig. 3 of the drawings, iluid under pressure may pass from conduit 55 by way of channel 53 into a passage 56 which communicates with the end of cylinder 4|. At the same time channel 54 places passage 51 which communicates with the end of cylinder 40 in communication with the interior of housing 21 by way of a passage 58 formed in the housing adjacent the valve chamber 5| therein. Thus it will be apparent that in the position of the parts shown in the drawings, the cylinders have completed their movement in one direction and the valve'has been shifted so that the pistons are about to start their movement in the other direction.

It will be understood that when the valve 5|! is shifted to the right, as viewed in Fig. 3 of the drawings, the cylinder 4i will be connected to the exhaust. while cylinder 4l will be connected to the source of iluid under pressure. Such a posihand end thereof by way oi' passage 52. From the right hand en`d of the chamber the iluid under pressure may enter channel 54 by way of the bypass formed by bore 59, and from the channel 54 the fluid under pressure may of course enter the cylinder 40 by way of passage 51. At this time cylinder 4| will be connected to the exhaust by way oi channel 53 which places the passage 56 in communication with passage 66 which opens to the interior of the housing 21.

For actuating the valve, there is provided an arm 6| which is fixed to the valve and which has a bifurcated end 62 which embraces a rod 63 carried by lugs 64 which depend from the yoke 44. Springs 65 and 6'6 are mounted on the rod 63 between the lugs 64 and the arm 6|, with the result that these springs act on the arm 6| to urge the same in one direction or the other.

Itv is of course desirable that the movement of the valve be substantially instantaneous as the pistons approach the limits of their movement in one direction or the other. For this purpose locking means is provided for restraining the valve against movement until the pistons have substantially completed their strokes. This locking means comprises levers 10 pivotally mounted within housing 21 on opposite sides of arm 6I. The levers 10 have arms 1| connected by a spring 12 which functions to normally urge the levers about their pivots or into engagement with the arm 6|. A pin 13 ilxed to the yoke 44 is arranged to alternately engage the arms 1| to thus alternately move the levers to their releasing positions.

Each lever is provided on its under face with shoulders 14 and 15 adapted to engage the sides of arm 6|. These shoulders limit movement of the arm as will now be described.

With reference to Fig. 2 of the drawings, it will be noted that the valve 50 has been moved to a position adjacent the right hand end of chamber 5|. When the valve is in this position the shoulder 'l5 on the lever to the right of the arm 6| is in engagement with this arm to thus limit further movement of the valve to the right. The shoulder 14 on the lever on the left hand side of the arm, as viewed in Fig. 2, is engaging the arm to hold the valve against movement to the left. At this time uid is being admitted to cylinder 4| while cylinder 40 has been opened to the exhaust, with the result that the pistons and the yoke are about to move to the left. As the yoke moves to the left it will be apparent that spring 65 will be compressed by the arm 6| and lug 64. The valve, however, will not be moved to the left until pin 13 strikes the arm associated with the lever to the left oi arm 6I. At this instant this lever will be raised to release the engagement of its shoulder 14 with the edge of arm 6|, with the result that at this instant spring 65 will act to move the arm 6| and the valve to the left until the arm engages the shoulder 15 formed on the lever at the left side of the arm. Thus it will be apparent that as the yoke is reciprocated the valve 50 will be periodically actuated to alternately place the cylinders in communication with a source of iluid under pressure and with an exhaust. By properly locating the pin 13, cushioning of the pistons at either or both ends of their strokes may be effected.

As brought out before, uid under pressure is supplied to the valve chamber by way oi conduit 55, and this conduit has its inlet end tapped into a chamber 15 formed in the valve housing 3|. A passage 11 provides communication between chamber 16 and passage 32, and a valve 18 is provided for normally closing this passage, there being provided a spring 19 for holding the valve 18 in its closed position. Formed in the valve housing adjacent chamber 16 is a second chamber 80 which communicates with the interior of the blower element by way of a passage 8|. A valve seat 82 is disposed between chambers 16 and 80, and the valve 18 cooperates with this valve seat to close communication between chambers 16 and 80 when the valve 18 has been shifted to the left, as viewed in Fig. 1 oi.' the drawings, to place passage 32 in communication with chamber 16.

For actuating the valve 18, there is provided a stem 83 normally held in valve-releasing position by a spring 84. A lever 85 pivotally secured to the end of the valve casing 3| has a cam face 86 adapted to engage the end of the stem 83 when this lever is actuated by a depending actuating chain 81.

For controlling the admission of cleaning iiuid to the blower element, there is provided a valve 9U mounted in the valve casing 3|. The stem 9| of this valve is secured to a piston 82 mounted for reclprocation in a cylinder93. A spring 9d disposed in this cylinder operates to close the valve 90 when the fluid pressure, which builds up back of the piston by virtue of the leakage of the cleaning fluid around the same, balances the fluid pressure acting on the front face oi the piston. Whenever chamber 93 is opened to the exhaust, as will hereinafter be described, the pressure of the cleaning fluid in passage 32 acting on the forward face of piston 92 moves this piston to the right, as viewed in Fig. l, to thus open valve 9@ and admit cleaning fluid to the blower element.

For periodically placing cylinder 93 in conimunication with the exhaust as the blower element is rotated, there is provided a cam ab fixed to the gear for rotation with the same. This cam is arranged to engage a lever @E pivotally secured to the housing 2l, and this lever has a cam face al arranged to engage a valve 953. This valve when actuated by lever 9d places chamber d@ in communication with the atmosphere by way of passages illil. A conduit iti provides communication between chamber 99 and cylinder 93, with the result that when valve 9d is actuJ ated, cylinder 93 is placed in communication with the atmosphere, and thus valve at is opened. A spring |82 closes valve 9B when the lever se drops out of engagement with this valve.

In use, operation of this form of construction may be initiated by pulling downwardly on chain di. This causes stem @t to move valve d8 to the left, thus placing passage 32 in communication with chamber 1t. The pressure of the cleaning fluid in passage 32 acting on the valve 18 will hold the valve in this position against the force exerted by spring it.

Fluid under pressure from chamber it will be supplied to valve chamber 5i by way of conduit so that the pistons 42 and i3 will start to reciprocate. Reciprocation `of these pistons will eiect a rotation of ratchet wheel 39 which, by way of pinion 31 and gear 35, will rotate the blower element. As brought out before, upon reciprocation of the pistons and of the yoke, the valve 5@ will be periodically actuated to alternately place the cylinders 48 and 4| in communi cation \with the source of uid supply and the exhaust.

As the blower element rotates, the cam-95 will be moved to actuate lever 96 and to thus exhaust the iluid under pressure from cylinder 93. At this time the pressure oi the cleaning iiuid acting on the face of piston 92 will move this piston to open valve 9|! to thus admit cleaning fluid under pressure to the blower element, lt being understood that at this time the cleaning fluid will be discharged from the blower element adjacent the portions of the fluid heater to be cleaned.

As soon as cleaning fluid under pressure is admitted to the blower element, this cleaning fluid enters chamber by way of passage 8|. The pressure of the cleaning fluid in chamber 80 acting on valve 18 moves this valve to the right, thus closing communication between chamber 16- and passage 32. When the valve is in this position, however, fluid under pressure may ow from chamber 80 to chamber 16 through valve seat 82, so that uid under pressure will continue to be supplied to the valve chamber 5| from the blower element by way of passage 8|, chamber 80, etc.

'I'hus the pistons will continue to reciprocate and the blower element will continue to rotate until the cam 95 passes out of engagement with lever 96.` At this instant the valve 98 will close, thus closing communication between cylinder 93 and the exhaust. 'I'he cleaning Huid then leaking around piston 92 will build up a pressure in cylinder 93, with tbe result that the valve 9U will be moved to its closed position.

The closing of valve 9|! will of course cut od the admission of cleaning fluid to theblower element, withv the result that cleaning uid will no longer be supplied to the valve chamber 5i. This will result in a termination of the reciprocation of the pistons d2 and d3 and in a termination of the rotation of the blower element. It will thus be apparent that once the operation of the blower element is initiated by pulling on the chain tl, the blower element will rotate through one revolution, during which time cleaning fluid. will be admitted to the blower element during a portion oi its movement. When the movement of the blower element is terminated, the valve admitting cleaning fluid to the same will be closed, and the parts will be in position for the next cleaning operation.

in Figs. 4 to 6, inclusive, a slightly modified form ci control device is shown, this device being adapted to be added to the structure above described to vary the number of rotations of the blower element incident to each operation thereci. Referring then particularly to these figures of the drawings, it will be noted that there is fixed to the valve casing die a housing MI5, this housing having a depending portion i116 bored to receive a plunger itl. The actuating chain |31a is connected to the lower end of plunger |81 so as to be adapted to move the same downwardly against the tension oi`.spring |08. The plunger is provided with a tapered portion |09 intermediate its ends, this tapered portion constituting a cam for moving the stem 83a to the left when the plunger is pulled downwardly.

Mounted in suitable guides iiii in housing is a member iii. This member is adapted for sliding movement longitudinally of the guides iiil and is normally urged to the left, as viewed in Fig. 4, by a spring H2 which engages a block ||3 which depends from the member III. The block ||3 is provided with stepped shoulders |I4 adapted for engagement with the upper end of plunger |01.

'I'he member |I| carries on its upper face a block ||5 having ratchet teeth I|6 adapted to be engaged by a, pawl H1 secured to the end of a stem I Il which is ilxed to the piston 92 for reciprocation with the same. Guides I I9 formed on the side of housing |05 tend to hold the pawl ||1 out of engagement with ratchet teeth IIB during a portion of the longitudinal travel of stem ||3.y Formed in the opposite sides of the housing are openings |20 into any aligned pair of which a pin I2| may be inserted, this pin limiting forward movement of member I I| by engaging the forward end of block II5.

In the operation of this form of construction, the number of rotative movements to be imparted to the blower element may be determined by inserting pin I2| in the proper pair of holes |20. Thus, if it is desired that the blower element rotate four times, the pin would be inserted in the fourth hole from the right, as indicated in Fig. 5 of the drawings. With the pin inserted in this hole, a downward pull on chain 81* would cause plunger |01 to move stem 83 to the left, thus opening valve 18* to admit fluid under pressure to the control valve (not shown) for the actuating pistons. Obviously, this downward pull of the plunger would move the upppr endv thereof out of the path of travel of the member III, thus permitting this member to move to the left to the position shown in Fig. 5 o! the drawings.

The blower element would be rotated by admission of iluid under pressure to the actuating pistons, and once during each revolution of the blower element the valve would be actuated as previously described. Each time the valve 90'I is opened, it would act through stem I I8, pawl ||1 and ratchet teeth IIB to move member one step to the right, so that the upper end of plunger |01 would engage the next higher step I I4. Since the plunger |01 will be held downwardly by the portion ||3 of the member III until the member I is moved entirely to the right or to the position shown in Fig. 4 ofthe drawings, it will be apparent that the valve 18 will be held open until the blower element rotates a suiilcient number of times to eiect this movement of the member III. Obviously, when the member ||I has been moved sufciently far to the right so that the upper end thereof clears the top plunger |01, thus permitting the plunger to return to its original position, the valve 13' will then close communication between passage 32Il and chamber 16a. The blowerelement will then continue to rotate until valve 90 cuts of! the admission of cleaning fluid to the blower element, at which time rotation of the blower element will be stopped.

From the above it will be apparent that the attachment disclosed in Figs. 4 to 6, inclusive, may or may not be added to the head disclosed in Figs. 1 to 4, inclusive. When this attachment forms a part of the control mechanism, the blower element may be caused to operate a desired number of times by properly locating pin |2I in hous. ing |05.

In Figs. 7, 8, and 9 a modiiled form of construction is disclosed in which, as in the last described form of construction, the number of rotative movements and thus the number of operations of the blower element may be regulated as desired. In this embodiment of the invention,

the blower element 25b is shown as being journaled in a head designated generally by the reference character 25h. 'This head comprises a gooseneck |25 in one end of which the blower element is journaled and to the other end of which cleaning iluid is supplied by a s uitable supply pipe I 28. A gear 35b is ilxed to the blower element for rotating the same, and this gear is driven by a pinion |21 which is mounted on the driven shaft |28 of a suitable iluid motor which may be of any desired character and which is designated by the reference character |29.

Cleaning uid is periodically admitted to the blower element upon rotation thereof by mechanism which includes a cam b fixed for rotation with the gear 35", this cam engaging a suitable trigger I30, this trigger in turn engaging the stem |3| of a valve |32. Periodically upon rotation of the blower element the stem I3| is depressed to open the valve |32 to thus admit cleaning Iluid from the supply pipe to the blower element. A leaf spring |33 connected to the valve stem aids in closing the valve.

Mounted in the supply pipe |23 in advance of the vvalve |32 is a valve |35. Tapped into the head 26b but between valves |35 and |32 is a conduit |36 which supplies cleaning fluid under pressure to the fluid motor |29, the exhaust from this motor being conducted to any suitable point by a conduit |31. The arrangement as thus far described is such that when the valve |35 is opened, iluid under pressure will be immediately admitted to the iluid motor to rotate the latter. Cleaning fluid, however, will only be admitted to the blower element periodically as the valve |32 is opened during rotation of the blower element.

Connected to the valve |35 is a stem |38, and this stem is secured to a piston |39 which is mounted for reciprocation in a cylinder |40. This cylinder is in communication with the supply pipe |26 so that iiuid in the supply pipe may leak around the piston to build up a pressure in back oi.' the same, the arrangement being such that when the pressure of the cleaning uid in `back of piston |39 balances the pressure of the cleaning uid acting on the front face of the piston, the iorce of spring |4| will move the valve |35 to closed position. Obviously, whenever the space in cylinder |40 between the piston |39 and the closed end of the cylinder is opened to the exhaust, the cleaning uid acting on the face of piston |39 will move this piston to thus move the valve to its open position.

For controlling communication between the cylinder |40 and the atmosphere and to thus provide means for exhausting the tluid pressure from in back of piston |39, there is provided a conduit |45. Mounted in this conduit is a valve |46 nor- \mally held closed by a spring |41. When the valve |46 is opened against the force exerted by the spring, fluid under pressure from cylinder |40 may be exhausted by way of the discharge end |48 of the conduit |45.

For actuating the stem |50 of valve |43, there is provided a cam I 5|, and this cam is fixed` to a sleeve |52 which is rotatably journaled on a shaft |53. Fixed to the sleeve |52 for rotation with the same is a ratchet wheel |54, and suitably supported from the head 2Gb is a lever.|55 which carries a pawl |56, this pawl engaging the ratchet wheel |54 to rotate the latter. 'Ihe pawl engages the ratchet wheel tangentially and the teeth of the latter are preferably so arranged that each rocking of the lever |55 moves the ratchet wheel one tooth. Chains |51 and |55 secured to the opposite ends oi the lever |55 provide means for actuating this lever.

The sleeve |52 is frictionally constrained to rotate with the shaft |53 by a ball |50 mounted in a suitable bore formed in a boss |60l in the sleeve |52. A spring |6| adjustable by a threaded plug |82 engages the ball |56 to urge the same into engagement with recesses |63 spaced circumferentiaily of the shaft |53.

Fixed for rotation with the blower element is a pinion |65, and this pinion drivingly engages a gear |66 fixed to the shaft |33. 'Ihe arrangement is such that when the blower element is rotated, the gear |66 and thus the shaft |53 will be rotated.

In the operation of this form of construction, when the valves |32 and |35 are closed, the

' blower element will be at rest, no cleaning fluid at this time being supplied to the same. It will be understood that at this time the cutaway portion of the cam 5| will be opposite the valve stem so that the valve |46 will be closed.

If now, it is desired to eect an operation of the blower element, the lever will -be rocked by a proper pulling on chains |51 and |58, this rocking of lever |55 effecting a rotation of the ratchet wheel |54 in the direction of the arrow in Fig. 7 of the drawings. The shaft |53 will be held stationary during this actuation of the ratchet wheel by virtue of the inertia of and the resistance to rotation oi.' the gear |66, blower element 25b and associated structure. Thus, upon rotation of ratchet wheel |54 by pawl |56. this ratchet wheel and the cam will be rotatedwith reference to the shaft |53, the cam engaging stem |50 to open valve |46.

Opening of valve |46 permits fluid to exhaust from the closed end of cylinder |40 whereupon the pressure of the cleaning fluid acting on the face of piston |39 moves this piston to cause the same to open valve |35. Upon opening of valve |35 cleaning fluid passes immediately to the fluid motor |29 by way of conduit |36, thus causing this uid motor to rotate pinion |21 and the blower element 25h. As the blower element rotates, the valve |32 will be periodically opened to admit cleaning fluid to the blower element during a predetermined portion of the rotation thereof.

It will be apparent that as the blower element rotates, the gear |66 will be rotated, thus rotating shaft |153.` The sleevel .|52 being frictionally constrained to rotate with shaft |53 by spring-pressed bail |59, will thus be rotated to move the cam |5| to its original position where its cutaway portion again registers with the valve stem |50, thus permitting valve i46 to close. 0bvlously, as soon as valve E46 closes. pressure will `build up in back of piston |39, thus eifecting a closing of main valve H35 and a termination of the operation of the fluid motor i 28 and of the blower element.

The several gears and associated parts are preferably so designed that a single pull on chain |58 ratchets the ratchet Wheel |54 around one tooth, and moves the cam i 5| sufilciently that the cutaway portion of this cam will be brought into registration with the valve stem |50 after the blower element has made one revolution. If it is desired that the blower element make two or more revolutions, two or more pulls are impart-ed to the chain 856, thus causing the cutaway portion of the car'n i5| to be moved farther away from the valve stem |50. Obviously, the number of pulls imparted to the chain |53 determines the movement of the cam i5| with reference to the valve stem and thus predetermines the amount of reverse movement of the cam necessary to permit a closing oi valve |46 and a termination of the operation of the blower element.

It is to be understood that the fluid motor |25 may be adapted to drive the blower element either continuously in one direction or to oscillate the blower element. If the blower element is rotated continuously in one direction, the valve |32 will be utilized to 4limit the supply of cleaning fluid to the blower element to a portion only of its rotative movement.l Il, on the other hand, the blower element is osciilated by the motor |23, the valve |32 may be eliminated since the blower element will be oscillated only through the arc in which blowing is desired.

In Figs. 10 and 11 a further modified form of construction is disclosed as comprising a blower element 25c which is suitably journaled in a head designated generally by the reference character 26s. 'Ihe head in this instance may be similar to the head shown in Fig. 7 of the drawings, thus including a gooseneck |25 through which cleaning lfluid is supplied to the blower element. A

supply pipe |26c supplies cleaning fluid to the gooseneck. there being provided a valve |32 which controls the flow of cleaning fluid from the supply pipe to the gooseneck. 'I'he stem i3|c of this valve is adapted to be actuated by a lever |30 which in turn is actuated by cam 95 upon rotation of the blower element, with the result that each time the blower element is rotated the valve is opened for a portion of the rotative movement.

For rotating the blower element or,` if desired, oscillating the same, there is provided a fluid motor |29 which in this instance drives a worm |15 which engages a worm wheel |16 xed to the blower element. Fluid under pressure is supplied to the fluid motor by way of conduit |36 which, it will he noted, may be conveniently tapped into the supply pipe |26. An exhaust conduit |31c is provided for the fluid motor, this exhaust conduit being arranged to discharge at any desired point remote from the fluid motor.

For controlling the ow of fluid under pressure through conduit |3|i and thus to control the actuation of motor |29 and the operation of the blower element, there is provided a valve i11. This valve is provided with a stem |18 and is normally held in closed position by a spring |19 which surrounds the valve stem and engages a collar on the same.

Suitably joumaled in a support |60 carried by the blower head is a shaft |8|, and secured to this shaft for rotation with the same is a ratchet wheel |82 and a cam |83. The cam is so positioned as to engage the upper end of valve stem 618 for a purpose which will hereinafter be more fully described.

Loosely journaled on shaft iti is a sheave wheel or the like |65, and pivotally carried by this sheave Wheel is a pawl E66 adapted to engage in an enlarged notch |81 formed in the ratchet wheel |52. A spring |58 engages the pawl |86 to urge the same toward the periphery of the ratchet wheel i 82.

The lever i30 is extended beyond its point of pivotal mounting on the head 26 to provide an extension |60, and pivoted to this extension is a pawl |5| adapted to engage the ratchet teeth G92 on the ratchet Iwheel |82. A spring |93 secured to the pawl 98| holds the same in a position to engage the ratchet teeth, as will be readily apparent.

Extending around the sheave wheel l|88 is a chain or other ilexible element having the depending ends |95 and |98. It will be understood th'at these ends extend to a point adjacent the boiler door where they may be conveniently grasped by an operator. The depending end |96 of the flexible element passes through a guide |91 carried by the support |88. and this portion of the chain or flexible element has fixed thereon a collar |99 adapted to engage the guide |91 to limit movement oi' the flexible inember in one direction.

With the structure above described it will be understood that when the blower element is not in use thevvalves |32 and |11 will be closed. It now, it is desired to effect an actuation oi the blower element, the end |98 of the tlexible element is pulled downwardly, the sheave wheel at this time rotating relative to the ratchet wheel |82 and cam |83. 'I'he sheave wheel |85 is rotated until the pawl |88 thereon engages in the enlarged notch |81 in the ratchet wheel |82.

The end |98 oi the flexible element is then pulled, with the result that the sheave wheel will be rotated in the opposite direction, and the ratchet wheel will be caused to rotate with the sheave wheel by virtue of the4 connection together of these two elements by the pawl |88.

AThis reverse rotation of the sheave wheel will be continued until the collar |98 engages lug |91, it being understood that during this movement of the ratchet wheel, the cam |83 will be rotated so as to engage the valve stem |18 and open valve |11.

Opening of valve |11 admits fluid under pressure to iluid motor |29, with the result that the blower element is rotatively driven. As the blower element is rotated, the lever |38 is actuated to periodically open and close valve |32. 'Ihis rocking of lever |38 eects a movement of the ratchet wheel |82 and cam |83 by virtue of the 'engagement of pawl |8| with the teeth on the ratchet wheel. Thus during rotation of the blower element, the cam |83 will be rotated with a step by step movement until it passes out of engagement with the valve stem |18, thus permitting valve |11 to close.

The cam |83 is preferably rotatively adjustable with reference to the ratchet wheel |82, there being a set screw |99 associated with the hub of the cam to nx the cam in adjusted position. The arrangement is such that the cam may be set so that it will be moved out of engagement with the valve stem |18 after the blower element has completed one revolution. If it is desired that the blowerelement move through more than one revolution, the cam |83 may be so adjusted relative to the ratchet wheel that when the ratchet wheel has been moved to such an extent that the collar |93 engages lug |91, the cam will be in such a position that it will require two or more complete rotations oi' the bl'ower element to move the cam out of engagement with the valve stem |18. Thus the cam may be readilyadjusted so that after the operation oi the blower element has been initiated, the blower element will continue to be operated through a desired plural number oi rotations.

It will be apparent that cleaning uid may, if desired, be at all times supplied to supply pipe |28", the arrangement being such that the blower element will not be operated until the flexible actuating chain or element has been manipulated in the vmanner above described. 'Ihe operation oi the blower element is dependent upon a prior opening of valve |11, the opening of this valv'e initiating the movement of the blower element and the movement of the blower element controlling the flow of cleaning fluid to the same.

In Figs. 12 to 15, inclusive, there is disclosed electrically controlled means tor accomplishing the results accomplished by the sheave |85. ratchet wheel |82, cam |33 and associated structure disclosed in Figs. 10 and 1l. In the modied. construction, the reference character |38d designates a conduit similar to the conduit |38c in that it extends to a huid motor (not shown) which is arranged to drive a suitable blower element (also not shown). The valve |11d controls the ow of fluid under pressure through this conduit, this valve being normally closed by a spring |19d. which spring is sleevedon the stem |18d of the valve. l

The stem of the valve is arranged to be engaged by a cam |83d, which cam is mounted on a shaft |8|d, there being also ilxed to this shaft for rotation with the same a ratchet wheel |82d. This ratchet wheel has teeth |92d adapted to be engaged by a pawl |9|d pivotally carried by the extension |98d of the valve actuating lever (not shown) of the blower head (not shown). It will be apparent that, as in the previously described form of construction, when the blower element is rotated, the pawl |9|d will be periodically actuated to ratchet the wheel |82d about its axis and to thus move the cam |83d with reference to the valve stem |186.

For the purpose of initially actuating cam |83d to thus open valve |11d, an electrically controlled mechanism is provided. 'I'his mechanism includes an electric motor 288 on the shaft of which is mounted a worm 28|, this worm drlvingly engaging a worm Wheel 282 which is rotatably journaled on the shaft |8|d. The control means for the electric motor 288 is so arranged that each time the circuit is closed through the electric motor the worm wheel will be caused to rotate through one revolution, stopping in each instance in the position shown in Fig. 12 of the drawings.

The control means for the motor comprises the leads 285 and 288 which are suitably connected to any suitable source of current (not shown). Lead 288 is connected to a brush 281, this brush being also directly connected by lead 288 to one terminal 289 of the motor 288. The other terminal of the motor is connected by a lead 2li to one terminal 2| 2 of a switch designated generally by the reference character 2|3. The other terminal 2|4 of this switch is directly connected by a lead 2|! with the lead 288.

A switch arm 2|8 is provided for closing the circuit between terminals 2|2 and 2M, the arrangement being such that when this circuit is closed, electrical energy is supplied to the motor 288 to cause rotation of this motor. The switch arm 2|6 is solenoid actuated, the arrangement being such that when this switch arm is initially, manually or otherwise actuated, it will be held in closed position until the electric motor has rotated sufilciently to rotate' the worm wheel nected by lead 2| 9 to brushes 220 and 22|. These brushes are disposed on opposite sides of the brush 201, the three brushes being spaced apart and being arranged to engage a contact strip 222 mounted on the worm wheel 202 for rotation with the. latter. It will be understood that whenever the solenoid 2|1 is energized, the switch 2|6 is closed, while whenever the solenoid is deenergized, the switch arm 2 |6 is moved to the position shown in full lines in Fig. 12 of the drawings, by any suitable means (not shown).

In the operation of this control means, as thus far described, it will be understood that with the parts in the position shown in Fig. 12 of the drawings, no current will be supplied from the leads 205 and 206 to the motor 200. `When, however, the switch arm 2| 6 is moved into engagement with contact 2 4, current is supplied to the motor by way of leads 206 and 208 on the one hand and lead 2| switch 2|3 and leads 2|5 and 205 on the other hand. This will immediately start a rotation of the motor and thus a rotation of the worm wheel 202. As soon as the contact strip 222 moves sufficiently to span the space between brushes 220 and 201, a circuit will be completed through the solenoid 2|'| by way oi. lead 206, brush 201, contact strip 222, brush 220 and lead 2|9. This will eiect an energization of the solenoid and will hold the switch arm 2 I6 in engagement with contact 2|4, thus holding closed the circuit through the motor 200.

The solenoid will remain energized for a short period even after the rear end portion of contact strip 222 has passed out of engagement with brush 220, for during this interval, the circuit will be closed through the solenoid by way of lead 206, brush 201, contact strip 222, brush 22| and. lead 2|9. As soon, however, as the end of strip 222 passes out of engagement with brush 207, the circuit through the solenoid lwill be broken, thus permitting switch arm 2|6 to move out of engagement with contact 2M, and thus breaking the circuit through the motor 202.

The rotation of the worm wheel through an arc of 360 is utilized for the purpose of adjusting the position of cam ltd with reference to the valve stem lld, it being understood that vthis cam opens valve llld and holds the same open until the cam is moved out of engagement with the end of the valve stem. This is accomplished by forming in the ratchet wheel m2 a circumferen tially extending slot 225 and by loosely mounting a pin 226 in an opening 222 formed through the worm wheel 202. The pin 226 is so positioned from the center of the Worm wheel as to register with the slot 226.

A spring 228 surrounds the pin 226 and engages a head 229 formed on this pin to normally urge the vpin rearwardly so that the head thereof engages a cam member 230 which is supported adjacent the shaft |8|d for rotative adjustment with respect to the same. This cam is provided with the cutaway portionr 213i, this cutaway portion being of sucient depth so that when rotationoi:-

4the worm wheel brings the pin opposite this cutaway portion of the cam, the end of the pin will be withdrawn from engagement in the slot 225. The cam is also provided with an inclined portion 232 which connects the cutaway portion to the raised portion 233 of the cam, the arrangement being such that as the worm wheel is rotated,

carrying with it the pin, the head of the pinA rides up on the inclined portion 232 of the cam and is thus projected from the worm wheel and through the slot 225 in the ratchet wheel.

With the structure disclosed, it will be apparent that the amount of rotation imparted to the ratchet wheel |62i and thus to the cam |83il incident to rotation of the worm wheel .202 through 360 will be dependent upon the rotative positioning of the cam 230 with reference to the ratchet wheel. With the parts in their normal positions, it will be understood that the ratchet wheel I|l2dl will be in such a position that the slot 225 thereof will be substantially in the position shown by dotted lines in Fig. 12 of the drawings. At this time the cam |83d will be out of engagement with the valve stem |10, and the v'alve |11cl will be closed.

II, now, the switch arm 2|6 is moved into engagement with contact 2M, worm wheel 202 will be rotated through 360. The initial rotation of the worm wheel will not, however, effect a rotation of the ratchet wheel, it being necessary first that the worm wheel rotate relative to the cam sumciently to bring the pin 226 out of registration with the cutaway portion of the cam to the end that the pin will be projected through the slot 225. The pin 226 will travel in the slot 225 until it reaches the end of the slot,-at which time the ratchet wheel will be rotated with the worm wheel until the pin again comes opposite the cutaway portion of the cam. At this instant the pin will be withdrawn from the slot 225 by means of spring 220 so that the worm wheel may continue to rotate with reference to the ratchet wheel. Obviously, as the blower element (not shown) is driven, the pawl ISId will be actuated periodically to ratchet the ratchet wheel |82d in the direction in which it had previously been traveling. This movement of the ratchet wheel will eventually cause the cam l83d to move out of engagement with stem lld, thus allowing a closing of valve llld. Since the rotation of the blower element and thus the actuation of pawl Mid is dependent upon the`-fluid under pressure supplied to the blower head by way of conduit i664, it will be understood that as soon as the cam idd has been moved to a position where valve i'lld may close, the operation of the entire mechanism will be terminated.

It will be apparent that the extent of movement imparted to the ratchet wheel by the worm wheel will be dependent upon the rotative positioning of the cam 236 with reference to the ratchet wheel. Further, the amount of opening of the valve incident to any predetermined rotation of the ratchet wheel will be dependent upon the adjustable positioning of the cam mdd with reference to the ratchet wheel. For this reason the cam i636 and ratchet wheel lZd are preferably secured to the shaft ltld for adjustable rotative positioning with reference to the same. Likewise the cam' 230, while not secured to the shaft mld, v

is suitably mounted on a support 235 so as to be adapted for adjustable rotative positioning with reference to the shaft Mild.

It constitutes a feature of this 'form of con-7 when the leads 2li and 206 are energized andV thus when electric current is being supplied'v to the motor 200, electric current will be supplied to lamp 236 to light the latter. Thus this lamp will is driven.

For the purpose of indicating the closing of valve |1`|d and thus the completion of the operation of the blower head to which fluid under preasure is being supplied, there is provided a signal lamp 231 mounted in a lead 238 which terminates in a brush 239. This brush extends to adjacent the ratchet wheel |82d and is disposed in spaced relation to a second brush 248 which is electrically connected to the lead 285 by a lead 24|. The brushes 239 and 240 are spaced from the face of 'ratchet wheel |82d, and formed on the face of the ratchet wheel is a relatively short contact strip 242 adapted to electrically connect the brushes 239 and 240 when the ratchet wheel has been rotated to a position where the cam |83d is moved out of engagement with the valve stem It will be apparent that normally, when the system is not operated and the valve |11d is closed, the lamp 231 will be illuminated. When, however, the ratchet wheel |82d is rotated to a position where cam |83d opens valve |119, the contact strip 242 will be moved out of engagement with brushes 239 and 248, thus breaking the circuit through lamp 231. This circuit will remain broken during the ratcheting of the wheel |82d or until this wheel is moved to a position where closing of valve |11d is permitted. Thus the lighting of lamp 231 will-indicate that the blower element which the mechanism controls has operated the desired amount and the supply of iluid under pressure to the motor thereof has been cut off. It will be understood that while the signals have-been described as comprising signal lamps, any other suitable signals may be substituted, either audible or visible.

With the blower elements controlled by mechanisms such as disclosed in Figs. 10 to 15, inclusive, it will be apparent that all of the blowers associated with any one boiler or with any group of boilers or fluid heaters might, if' desired, be controlled from some central point either located l adjacent the particular fluid heater being cleaned or located at some remote point such as the office or the like of the power plant. In Figs. 16 and 17 there is disclosed means whereby a plurality of control mechanisms of the character disclose'd in Figs. 10 and 11 might, if desired, be located at some point adjacent the fluid heater with which the blower elements are associated.

Referring then particularly to these figures, the numeral 243 designates a fluid heater of any desired character such. for example, .as a boiler. Associated with this fluid heater are the blower heads 26, it being understood that each blower head journals a suitable blower element (not shown), the blower elements extending into the fluid heater to discharge cleaning fluid adjacent the parts thereof to be cleaned. 'I'he heads 26e may be of the character shown in Fig. l0, with the result that pendant from each blower head are the ends |85e and |96e of suitable flexible actuating elements. As brought out in the description of Eig. l0, suitable actuation of the depending vends of the flexible elements will cause operation of the blower heads with which the flexible elements are associated, the blower elements in each instance being operated for a predetermined period of time, dependent upon the setting ofthe particular heads.

The several flexible elements may be brought to adjacent -the front of the fluid heater and the ends thereof engaged with sheave wheels 244 be lighted during the interval that the motor 208 loosely mounted on a shaft 245. Each sheave wheel is preferably of a size substantially larger than the sheave wheel of the head which it controls, with the result that a slight rotation of the sheave wheels 244 will effect substantial rotative movements of the sheave wheels associated with the heads. Each sheave wheel 244 is also preferably provided with a handle 246 by which it may be rotated.

Disposed adjacent the sheave wheels 244 is a main cleaning fluid supply conduit 241 to which it will be understood the several supply conduits for the blower elements are all connected. A valve 248 in the conduit 241 is preferably so located that it may be conveniently actuated by gig: operator who is rotating the sheave wheels With this arrangement it will be apparent that an operator may cause the blower elements to operate in any desired sequence and either one at a time or more than one at a time by first opening valve 248 and then by properly rotating the sheave wheels 244. It will be understood that these sheave wheels are rotatable entirely independently of each other with the result that the blower elements may be operated in any order or-sequence desired. Suitable indicating mechanisms may be associated with the blower elements to advise the operator of the fact that the blower elements are operating.

As disclosed in Fig. 18 of the drawings, a number of switches similar to the switch 2|3 shown in Fig. 12 of the drawings may be assembled at a. central point to provide for the operation of a number of blower elements from this point. A number of these switches, each being designated by the reference character 2 I3t are shown as being mounted on a suitable panel 250, it being understood that this panel may be located at any desired point, either adjacent to or remote from the fluid heater or heaters to be cleaned.

As illustrated", each switch may comprise the spaced terminals 2 |2t and 2 |4f and a switch arm 2 I6l movable to electrically connect these spaced terminals. A push button 25| may be assiated with each switch arm for actuating the same, there being also associated with each switch arm a solenoid 2|1f operating to hold its respective switch arm in contacting position until the motor which it controls has operated for the desired period of time. The signal lamps 236t and 231t will indicate the operation of the several electric motors controlled by these switches and the several blower elements of the system.

As in the just previously described form of construction, the location of a plurality of controls at a central point permits a single operator to control the operation of a number of blower elements. Still further, the blower elements may be operated in any predetermined desired sequence and if desired, two or more blower elements may be caused to operate during the same interval of time.

In Figs. 19 and 20 a further modified form of control mechanism is disclosed, this mechanism being adapted to provide for the operation of a blower element for a predetermined period of time. In these gures the numeral |365 designates the conduit which supplies uid underl pressure to the fluid motor (not shown) of a suitable blower head (also not shown). It will be understood that the fluid motor associated with the head may be adapted to either rotate or oscillate its respective blower element as desired.

Disposed in the conduit |36l for controlling the passage of fluid under pressure through the same is a valve |118, the stem|188 oi which is connected to a piston 268. This piston is mounted for reciprocation in a cylinder 26|, this cylinder being in communication at its lower end with the interior of the conduit |368 on'the pressure side of the valve in this conduit. A spring 262 mounted between the piston 268 and the closed end of cylinder 26| provides means for closing the valve |118 when uid pressure has leaked past the piston so that pressures on opposite sides of the pistons are substantially equal.

It willl be apparent that valve |118 may be opened by venting the space between the piston 268 and the closed end of the cylinder, the pressure of the iluid-in conduit |368 then acting on the lower face of piston 268 to move the same upwardly against the force exerted by the spring 262. To vent this space, a conduit 263 is tapped into the cylinder 26|, and this conduit may communicate either with the atmosphere or with any suitable exhaust. Disposed in conduit 263 is a valve 264, this Valve being normally urged to its open position by a spring 265 which surrounds the stem 266 of the valve and engages a head 261 formed on this stem. A weight 268 normally engages the valve stem 266 to counteract the action of the spring 265 and to thus hold the valve 264 to its seat.

For actuating the weight 268 there is provided a solenoid 218, and this solenoid is supplied with energy by leads 21| and 212. 'I'he lead 212 is directly connected to a lead 213 which is connected at its one end to one terminal 214 of a double-pole switch 215 and which is connected at its other end to a synchronous constant speed motor 216. The other lead 21| is connected to a brush 211 for a purpose which will hereinafter be more fully described.

The double-pole switch 215 is provided for electrically connecting the terminals 218 and 214 to a power line 219. Connected to the terminal 218 is a lead 288 which is connected to a terminal 28| from which a lead 282 extends, this lead being connected to a brush 283 disposed adjacent the brush 211. A switch arm 284 is provided for electrically connecting terminal 28| to a terminal 285, this terminal being connected by a lead 286 to the motor 216 and by a second lead 261 to a brush 288 disposed adjacent the brushes 211 and 283. The three brushes are arranged to wipe a contact strip 298 carried by a drum 29| which is rotatively driven by the motor 216. It will be noted that the contact strip extends only partly around the drum 29| so as to provide that at one portion during the rotation of the drum the brushes will be free from contact with the strip.

In operation, the switch is closed and the contact arm 284 then actuated to connect terminals 28| and 285. At this instant electrical current will be supplied to the motor 216 by way of leads 288 and 286 on the one hand and by way of lead 213 on the other hand. This will cause a rotation of drum 29| and will bring the contact strip 298 of the drum into engagement with the brushes 211, 283, and 288. As soon as these brushes engage the contact strip, the switch arm 284 may be released, there being provided suitable means (not shown) for moving this switch arm out of engagement with terminal 285 at this time. The motor however, will continue to rotate until the brushes pass out of engagement with the contact strip 290, current at this time being supplied to the motor by way of leads 288 and 282, brush 283, contact strip 288, brush 288 and leads 281 and 288 on the one hand and lead 213 on the other hand. During this period of rotation of the motor, electrical energy will be also supplied to the solenoid 218 by way of leads 213 and 212 onthe one hand and by way of leads 288, 282, brush 283, contact strip 288, brush 211 and lead 21| on the other hand. Thus the solenoid will be energized during the period that the brushes 211 and 283 are engaged by the contact strip 298.

vEnergization of the solenoid 218 raises the weight 268 out of engagement with the valve stem 266 whereupon the spring 265 opens valve 264, thus effecting a venting of the cylinder 26| above the piston therein. As soon as the cylinder is vented, the pressure acting on piston 268 opens valve |118 and permits fluid under pressure to flow through conduit |368 to the fluid motor which operates the blower element which is being controlled. Obviously, as soon as the contact strip 298 passes out of engagement with brushes 211 and 283, the solenoid 218 will be de-energized, thus allowing the weight 268 to again fall upon the valve stem 266, thus closing valve 264.

It will be apparent that by providing suitable reduction gearing between the motor 216 and the drum 29|, the interval of time in which the solenoid will be energized may be regulated as desired. Thus by providing a desired speed of rotation of the drum 28|, the period of time during which the blower element operates may be established. A lamp 282 may, if desired, be connected to the leads 21| and 212 to thus indicate the energization of the solenoid and thus the operation of the control system.

In Fig. 21 a slightly modified form of construction is disclosed which includesconduit |36h which, it will be understood, supplies iluid under pressure to the driving motor of a. blower element. The valve |11h in this conduit controls the ow of uld through the same and thus to the uid motor.

Valve |11h is provided with stem |18h, to the upper end of which is secured a head 388. The spring 38| engaging this head tends to normally urge the valve to its open position. Opposing the action of spring 38| is a Weight 382, and engagement of this weight with the head 388 is controlled by solenoid 218h which is supplied with current by leads 21|h and 21211. It will be understood that the flow of current through these leads may be controlled in the manner disclosed in Figs. 19 and 20.

With this construction, when the solenoid' is de-energized, the weight bearing on the head 388 will force valve |11h to its seat. Whenever, however, the solenoid is energized, the weight will be lifted from engagement with the head 388, thus permitting spring 38| to open the valve.

In Figs. 22`and 23 a further modified form of construction is disclosed which includes conduit |36k and valve |11k disposed in this conduit for controlling the ow of pressure fluid through the same. In this instancer the stem |18k of this valve is secured to a piston 385 mounted for reciprocation in a cylinder 386. Formed within the cylinder is a partition 381 which provides a chamber 388 above the chamber 389 in which the piston reciprocates.

Tapped into the cylinder 306 below the piston therein is a conduit 3|8, and tapped into the conduit |36k in advance of the valve therein is a conduit 3H. The conduits 3|8 and 3|| lead to a three-way valve 3| 2, there being also a discharge conduit 3|3 for this valve. The valve 3i2 is provided with an actuating handle 3M which is disposed in the path of movement of the collar 3II flxed to the valve stern luk.

Formed in the partition 331 is a check valve 3|3 arranged to permit passage of fluid from chamber 333 to chamber 303, but preventing the return flow ofiluid between these two chambers. A by-pass conduit 3| 1 is provided, however, placing these two chambers in communication with each other, there being a needle valve 3|! in this by-pass conduit for restricting the flow of fluid through the same.

In operation, when the actuating handle 3H is moved downwardly to the position indicated in dotted lines, pressure uid is admitted from conduit |38ll to the cylinder 30B below the pis-, ton in this cylinder. 'I'his forces the piston 305 upwardly against the force exerted on the same by the spring 320, thus opening valve |11k. Upward movement of the valve stem causes the collar 3| 5 thereon to move the valve handle 3M to the position shown in solid lines, in which position the conduit 3|0 is placed in communication with the exhaust conduit 3|3.

As soon as the pressure fluid is exhausted below piston 305, spring 323 acts to return the piston to its original position and thus acts to close valve |11! This movement of the piston is retarded by the restricted passage of fluid from chamber 308 to the chamber 309 above the piston. Thus by properly adjusting needle valve 3|8, the closing of valve |11* may be retarded to a desired extent.

It will be understood that as long as valve |11* is open, fluid under pressure will be supplied to the blower element actuating motor so that the blower element will be operated. The retarded closing of the valve |11* thus provides for the operation of the controlled blower element for a predetermined period of time.

In Figs. 24 to 26, inclusive, a further modified form of construction is disclosed which, however, is quite similar to that disclosed in Figs. 22 and 23. In this modified form of construction there is provided conduit |36m in which is mounted valve |11m. This valve is provided with stem |18m which is secured to piston 305m. A collar 3|5m on the valve stem is arranged to actuate lever 3Mm which controls valve 3|2m, this valve controlling communication between conduit 3|0m and supply and exhaust conduits 3i Ilu and 3| 3m respectively.

In this modified form of construction, the valve stem |18m is extended through the piston, and engaging the upper end thereof is a lever 320. This lever may itself be relatively heavy or may be weighted so that its engagement with the valve stem-tends to move the valve |11un to its closed position.

The lever |23 is pivotally mounted at its one end on a shaft 32|, and disposed on this shaft is a ratchet wheel 322, the teeth of which are engaged by a pawl 323 pivotally mounted on lever 320. An escapement mechanism is provided for retarding rotative movement of the ratchet wheel 322 in one direction, this escapement mechanism including ratchet wheel 324 and pendulum 325 having dogs 326 formed on the end thereof for engagement with the teeth on ratchet wheel 324. A weight 321 is mounted on the pendulum for adjustment longitudinally thereof to thus provide for varying the swing of the pendulum.

It will be understood that in operation, if the valve actuating lever 3MIrl is moved downwardhave been disclosed,

ly, fluid under pressure will be admitted to cylinder 303n below the piston therein, thus forcing this piston upwardly and opening valve |11. This upward movement of the piston and valve will actuate valve 3|2m to connect conduit III to the exhaust. During the upward movement of the valve |11nu the pawl 323 will idle over the teeth ot ratchet wheel 322, but as soon as the space below piston 305m is connected to the exhaust, the weighted arm or lever 320 acting on the stem of valve i'llm will tend to return this valve to its closed position. The movement of lever 320 incident to closing of the valve will be retarded by the escapement mechanism, with the result that by properly adjusting the escapement mechanism, the valve |11m may be held open for a desired period of time.

From the above it will be apparent that the invention provides control means for blower elements whereby the blower elements may be caused to operate for desired periods of time or through desire'd numbers of revolutions. In each instance the operation of the blower element may be initiated by a means which may be remote from the blower element and the operation of 'the blower will be automatically terminated without further action on the part of the operator.

While several embodiments of the invention it is to be understood that the right is reserved to make such changes in the details of construction and arrangement of parts as will fall wi'hin the purview of the attached claims.

What we claim as our invention is:

1. In a. fluid heater cleaner, a movable blower element, a source of supply of cleaning fluid under pressure, a fluid motor for moving said blower element, means operating to admit cleaning fluid to the blower element during a portion of its movement, means for admitting cleaning fluid under pressure directly from said source to said fluid motor to actuate the latter, and means operating after cleaning fluid is admitted to the blower element to conduct cleaning fluid from the blower element to the fluid motor to actuate the latter and to cut olli the direct supply of cleaning fluid from said source to said fluid motor.

2. In a fluid heater cleaner, a rotatable blower element, a source of supply of cleaning fluid under pressure, a valve for controlling the admission of cleaning fluid from said source to said blower element, means operating to open said valve during a portion only of the rotation of the blower element, a fluid motor for rotating the blower element, a second valve connected on the supply side of said flrst valve and to said fluid motor for controlling the flow of cleaning fluid from said source of supply to said fluid motor, means for opening said second valve and holding it open until said flrst valve has been actuated, and means communicating with said blower on the blower element side of said first valve for conducting cleaning fluid under pressure from said blower element to said fluid motor for continuing the actuation of the latter after closing of said second valve, said second valve being so constructed and arranged as to be closed by the pressure of the cleaning fluid when the cleaning fluid is conducted from the blower element to the fluid motor.

3. In a fluid heater cleaner, a rotatable blower element, means operating in timed relation to the rotation of the blower element to admit cleaning fluid to the same, a fluid motor for rotating the blower element, means for supplying uid underpressure to said uid motor to start the actuatioithereof prior to the admission of cleaning fluid to the blower element, and means operating upon the admission of cleaning fluid to the blower element to conduct cleaning fluid from the blower element to the fluid motor to actuate the latter and to cut off the initial supply of fluid under pressure to the fluid motor.

4. In a fluid heater cleaner, a rotatable blower element, a fluid motor for rotating said blower element, a valve for controlling the admission of cleaning fluid to the blower element, means operating to periodically open and close said valve upon rotation of the blower element, means for admitting fluid under pressure to said fluid motor to'actuate the latter, and means separate from but controlled by the actuation of said valve for cutting off the supply of fluid under pressure to said fluid motor after a predetermined plural number of rotative movements of the blower element.

5. In a fluid heater cleaner, a rotatable blower element, a fluid motor for rotating said blower element, a source of supply of cleaning fluidv under pressure, a valve controlling the admission of cleaning. fluid from said source of supply to said blower element, means for periodically opening and closing said valve upon rotation of the blower element, a second valve for admitting cleaning fluid under pressure from said source to said fluid motor to actuate the latter, means for conducting cleaning fluid under pressure from said blower element to said fluid motor to actuate the latter during the periods that cleaning fluid is being supplied to the blower element, and means for holding said second mentioned valve open during a plural number of rotative movementsof said blower element, said means providing for a closing of said second mentioned valve after a predetermined plural number of rotative movements of the blower element.

6. In a fluid heater cleaner, a rotatable blower element, a valve controlling the admission of cleaning fluid to the blower element, means for periodically actuating said valve upon rotation of the blower element, a fluid motor for rotating the blower element, a valve for admitting fluid under pressure to said fluid motor to actuate'the latter, a holding means for retaining said second mentioned valve in open position, and means actuated in timed relation to the operation of said first mentioned valve for releasing said holding me-ans after a predetermined plural number of rotative movements of said blower element.

'7. In a fluid heater cleaner, a rotatable blower element, a fluid motor for rotating said blower element, a valve for controlling the admission of fluid under pressure to said fluid motor, means for opening said valve and for holding the same open, and means operating in timed relation `to the rotation of the blower element to actuate said valve opening and holding means to provide for a closing of said valve after a predetermined plural number of rotative movements of the blower element, each rotative movement of the blower element including movement thereof away from and substantially back to its initial position.

8. In a fluid heater cleaner, a rotatable blower element, a fluid motor for rotating said blower element, a valve controlling the admission of fluid under pressure to said fluid motor, means including a cam for opening said valve and for holding the same open, and means operating upon rotation of' said blower element to move said cam to provide for a closing of said valve after a predetermined rotation of said blower element through an arc greater than 360 degrees.

9. In a fluid heater cleaner, a rotatable blower element, power driven means for rotatingsaid blower element, a cam controlling the supply of power to said power driven means, means for moving said cam to a position where power is supplied to said power driven means, and means operating upon rotation of said blower element through more than 360 degrees to provide for movement of said cam to a position where the supply of power to said power driven means is c'ut off.

10. In a fluid heater cleaner, a movable blower element, a motor for moving said blower element, means operating in timed relation to the operation of the motor for admitting cleaning fluid to the blower element, a single means operating when given a single power impulse to start the operation of the motor to thus initiate the operation of the blower element, and means for terminating the operation of the motor after the blower element has been moved away from and returned to its initial position a predetermined plural number of times.

11. In a fluid heater cleaner, a movable blower 'y element, a motor for moving said blower element,

means operating in timed relation to the operation of the motor for admitting cleaning fluid to the blower element, a single actuating member operating when given a single power impulse to start the operation of said motor to thus initiate the movement of the blower element, and means operating after the blower element has been moved away from and returned to its initial position a predetermined plural number of times to terminate the actuation of the motor and to cutoff the supply of cleaning fluid to the blower element.

12. In a fluid heater cleaner, a movable blower element, a motor connected to said blower element for moving the same, means operating in timed relation to the operation of said motor for admitting cleaning fluid to the blower element, a flexible actuating member, means operating upon the application of a single pull to said actuating member to start the operation of said motor to thus initiate the movement of the blower element, and means operating after a predetermined plural number of rotative movements of the blower element through 360 degrees to return said actuating member to its original position to terminate the operation of said motor and to cut off the supply of cleaning fluid to the blower element.

13. In a fluid heater cleaner, a movable blower element, a fluid motor for moving said blower element, a valve controlling the flow of fluid under pressure to said fluid motor, means including a movable member for opening said valve and for holding the same open, and means operating upon movement of said blower element to move said movable member to provide for a closing of said valve after said blower element has been moved away from and returned to its initial position a predetermined plural number of times.

14. In a fluid heater cleaner, a rotatable blower element, a cleaning fluid supply line for said blower element, a valve in said supply line, means operating to open said valve during a portion of the rotation of the blower element, a fluid pressure actuated motor connected to said blower element for rotating the same, a conduit for supplying fluid under pressure to said fluid motor, a valve in said conduit, means for opening said valve, and means actuated by the pressure of the cleaning fluid supplied to the blower element upon opening `of the valve in the cleaning fluid supply line for holding said second mentioned valve open whereby fluid under pressure is supplied to said motor whenever cleaning fluid is supplied to said blower element.

15. In a fluid heater cleaner, a movable blower element, power driven means for moving said blower element through a plurality of cycles of movement, each cycle including a movement of the blower element away from and substantially back to an initial starting point, means controlling the supply of power to said power driven means, and means operating after said control means has been actuated to supply power to the power driven means to prevent the cutting oil of the supply of power to the power driven means until the blower element has been moved through a predetermined plural number of cycles of movement.

16. In a fluid heater cleaner, a movable blower element, a source of supply of cleaning fluid, a valve controlling the flow of cleaning .fluid to the blower element, means for actuating said valve in timed relation to the movement of the blower element, power driven means for moving the blower element through a plurality of cycles of movement, means controlling the supply of power to the power driven means, means operating after said control means has been actuated to supply power to the power driven means to prevent the cutting oil of the supply of power to the power driven means until the blower element f has been moved through a predetermined plural number of cycles of movement, and means actuated by said valve and operating upon the completion of the movement of the blower element through said predetermined plural number of cycles of movement to provide for the cutting off of the supply of power to the power driven means.

1'7. In a fluid heater cleaner, a movable blower element, a fluid motor connected to said element for moving the same through a plurality of cycles of movement, each cycle including movement of the blower element away from and substantially back to an initial starting position, a source of supply of fluid under pressure, a valve controlling the ow of fluid from said source to said fluid motor, and means operating when said valve is opened to prevent closing of the valve until the blower element has been moved through a predetermined plural number of cycles, said last mentioned means then providing for a closing of said valve.

18. In a fluid heater cleaner, a movable blower element, a fluid motor connected to said blower element for moving the same through a plurality of cycles of movement, each cycle including movement of the blower element away from and substantially back to an initial starting position, a source of supply of fluid under pressure, a valve controlling the flow of fluid under pressure from said source to the motor, means for holding said valve open, and means controlled by movement of the blower element for closing said valve after the blower element has been moved through a predetermined plural `number of cycles of movement.

19. In a fluid heater cleaner, a rotatable blower element, a fluid motor connected to said blower element for rotating the same, a source of supply of fluid under pressure, a valve for controlling the flow of fluid under pressure from said source to said fluid motor, means for opening said valve. means to hold said valve open, and means operating to move said last mentioned means to provide for closing of the valve after a. predetermined plural number of rotative movements of the blower element through 360 degrees.

20. In a fluid heater cleaner, a rotatable blower element, a source of cleaning fluid under pressure, a valve controlling the flow of cleaning fluid from said source to the blower element, means for actuating said valve in timed relation to the rotation of the blower element, a fluid motor connected to the blower element for rotating the same, a second valve controlling the flow of cleaning fluid to said fluid motor, means for opening said second valve, means for holding said second valve open, and means actuated by said flrst mentioned valve upon actuation thereof to move said holding means to provide for closing of said second mentioned valve after a predetermined plural number of rotative movements of the blower element.

21. In a fluid heater cleaner, a movable blower element, a source of supply of cleaning fluid under pressure, means controlling the flow of cleaning fluid to the blower element, a fluid motor connected to the blower element for moving the same, a valve member operable in one position to admit cleaning fluid from said source to the motor and operable in a second position to admit cleaning fluid from said element to the motor and to cut off the direct supply of cleaning flui?. from the source to the motor, and means for actuating said valve member.

22. In a fluid heater cleaner, a movable blower element, a source of supply of cleaning fluid under pressure, means controlling the flow of cleaning fluid to the blower element, a fluid motor connected to the blower element for moving the same, a valve member operable to control communication between the source of supply of cleaning fluid and the motor and between the blower element and the motor, means for moving said valve to place said fluid motor in communication with the source of supply of cleaning fluid, and means providing for movement of said valve to a position where it places the blower element in communication with the fluid motor upon the admission of cleaning fluid to the blower element.

23. In a fluid heater cleaner, a rotatable blower element, a source of supply of cleaning fluid, a valve controlling the flow of cleaning fluid from said source to the blower element, means for actuating said valve in timed relation to the rotation of the blower element, a fluid motor connected to the blower element for rotating the same, a valve controlling the admission of fluid under pressure to the fluid motor, means normally acting to close said valve, a member movable to a position where it opens said valve and holds the same open, a second member for holding said last mentioned member in the position where it holds the valve open, and means connected to the cleaning fluid control valve and actuated thereby for moving the second member to a position where it releases said first member to permit closing of the valve.

NORMAN L. SNOW. WILLIS P. THOMAS. HARRY E. BRELSFORD. CURTIS L. HOWSE. FRANK BOWERS.

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