US2109075A

US2109075A - Device for cleaning tanks and the like

Info

Publication number: US2109075A
Application number: US672927A
Authority: US
Inventors: Harold M Ruth
Original assignee: PYRATE CORP
Current assignee: PYRATE Corp
Priority date: 1933-05-26
Filing date: 1933-05-26
Publication date: 1938-02-22
Anticipated expiration: 1955-02-22

Description

Feb. 22, w38. H M. RUTH 2,109,075

DEVICE FOR CLEANING TANKS AND THE LIKE original Filed May 26. 1935 -2 sheets-sheet 1 *It A INVE NTOR HAROLD M @u TH 22, Q, H, M. RUTH ZgS DEVICE FQR CLEANING TANKS AND THE LIKE original Filed May 26, 1933 2 sheets-sheet 2 PIE'. E-

im ALW" MINI N Fur... En-

` INVENTOR HAROLD /Vl QUT/1 Patented Feb. 22, 193s 109MB UNITED STATES PATENT OFFICE DEVICE FOR CLEANING TANKS AND THE LIKE Harold M. Ruth, Huntington Park, Calif., assignor to The Pyrate Corporation of Nevada, a corporation of Nevada Application May 26, 1933, Serial No. 672,927 Renewed September 19, 1934 11 Claims. (Cl. 299-67) 'Ihis invention has to do in a general way with I employ a liquid impelled motor which ispreferdevices for washing the interior of tanks and the ably driven by the pressure liquid that goes to like, and is more particularly related to devices the nozzles. In the development of this device, I of the general character disclosed in rnv applicahave also discovered that it is preferable in effect- 5 tion, Serial No. 637,028, led jointly with Clare ing a thorough cleaning of a tank to operate the` 5 Richards, on AOctober 10, 1932, in that it is espenozzles in a step by step manner. In this way cially adapted for use in cleaning the interior of I obtain a direct impingement of the stream tank cars. against the tank without the sweeping action that The general construction of the device contemattends a continuously moving nozzle, and I am l plated by this invention, like that of the former thereby able to effect a more thorough cleaning in l0 application referred to above, comprises, what I less time than is accomplished by the ordinary may term, a main feed conduit adapted to be type of nozzle. Itis, therefore, a further object suspended through the manhole in the dome of of this invention to provide means operated by a tank by means of a supporting plate. the liquid impelled motor to drive the nozzle in the l This main feed conduit is provided at its upper step by step manner referred to, such means in l5 end with means for connection to a suitable the preferred form of my invention comprising a source of supply of washing liquid, and at its lower ratchet mechanism interposed between the nozzle end it is provided with a bearing member which and the motor. rotatably supports, what I may term, a nozzle The element of speed is alsoan important feaunit comprising a secondary feed conduit arture. in a device of this character, and it becomeszo ranged in coaxial relation' with the feed conduit another object of this invention to provide means and having on its lower end a hollow nozzle axle for positively controlling the speed at which the or nozzle feed conduit which rotatably supports nozzles operate. Inasmuch as the speed of the a nozzle member. motor is dependent upon the pressure of the The nozzle member is mounted for rotation in liquid which operates the impeller, I take advan- 25 a substantially vertical plane, and means are tage of this fact to govern the speed by `providprovided for rotating the secondary conduit or ing a pressure-regulating valve in the passa-ge or the nozzle unit about the axis of the main feed passages through which the; liquid. travels from conduit. Through this construction, it will be the feed Conduit to the impeller. It is a noteseen that the nozzle unit has a rotation first in a Worthy feature of the invention that the Valve 3o vertical plane and second in a horizontal plane, just referred to may be set so as to operate the such rotative movements taking place simulnozzle unit at any predetermined speed.

taneously so that the interior of the. tank is com- As is well known to those familiar with the art, pletely covered by the spray or streams from the the length of the tank, or a tank car, is much nozzle member. greater than its diameter so that any angular 35 In the device of the former application, removement in a stream of liquid coming from a ferred to above, the nozzle member comprises a point beneath the dome will produce a much plurality of individual nozzles mounted on a greater linear movement in the stream at the end suitable hub, such nozzles having curved outlet of the car than at points `along the sides of the 4.o ends so that the force of the jet is effective to car. It will be seen, therefore, that in a device rotate the nozzle. Governor means are also prowherein the nozzle unit is rotated through a horivided to control the speed of such rotation. zontal plane at a uniform angular velocity, the

It is a primary object of this invention to proends of the car will not receive the same cleaning duce a device of the class described with angimaction as is applied to the sides. It, therefore,

proved nozzle construction. The nozzle units in becomes another object of this invention to pro- 45 this improved nozzle construction are formed vide a device of the class described wherein the with a substantially straight line taper so that angular velocity of the horizontal movement may there is no check in the flow of uid therethrough be varied so that the. stream travels slower in due to a curve or obstruction, and in this way I traversing the ends of the car than it does when am able to obtain a stream or jet of much greater it traverses thesides. In the device contem- 50 force which has much greater cleaning power and plated by this invention, like that disclosed in the which will be carried to the farthest extremities former application referred to above, the horiof an ordinary tank car as a substantially solid zontal rotation of the unit is effected by a pawl jet. and ratchet mechanism which is actuated directly ce In order to rotate a nozzle unit of this character, from the movement of the nozzle. 55

The objective, just referred to above, is accomplished by employing a ratchet mechanism which comprises vertically spaced and angularly disposed oiset ratchet segments, the upper segments being adapted to engage the upper end portion of the pawl member, and the lower segment being arranged to engage an intermediate point on the pawl member. The lower segment is provided with more teeth per unit of length than the upper segment so that the increments of motion, when the pawl is traversing the lower segment, are less than when the pawl traverses the upper segments. The installation is made in the tank so that the lower segments referred to are positioned where they will be engaged by the pawl during such time as the nozzle member is directing its streams toward the end portions of the tank.

It is a further feature of this invention that hinged ratchet segments are provided above the lower segments so that they can be folded down into position, under which circumstances the unit will have a horizontal movement of uniform angular velocity throughout its entire course of travel.

It is still another object of this invention to provide a device of the class described with means for efficiently and thoroughly cleaning the dome of the tank during the operation of the unit, such means in the preferred form of my invention comprising an auxiliary or dome spray nozzle rotatably supported from the support means in substantially flXed relation therewith.

Means are provided for rotating this dome spray from the secondary feed pipe, and means are also provided for delivering the pressure liquid to the dome spray. In this form of my invention, the pressure liquid is delivered to the dome spray from the secondary feed pipe through a flexible conduit.

It is another feature of this invention that the nozzle unit may be vertically adjusted inthe tank, and in order to effect such vertical adjustment without disturbing the position of the dome spray, I employ a telescoping member with positive driving means for moving the dome spray from the secondary feed pipe.

It is a further object of this invention to provide a device of the class described with means for delivering steam into the tank at a point well below the dome.

The details in the construction of a preferred form of my invention together with other objects attending its production will be best understood from the following description of the accompanying drawings which are chosen for illustrative purposes only, and in which- Fig. 1 is a vertical elevation with parts broken away showing a preferred form of my invention suspended through the dome of a tank car which is shown in section;

Fig. 2 is a fragmentary elevation taken in the direction of the arrow 2 in Fig. 1;

Fig. 3 is a plan section taken in the plane represented by the line 3--3 in Fig. 1;

Fig. 4 is a plan section taken in a plane represented by the line 4--4 in Fig. 1;

Fig. 5 is a plan section taken in a plane represented by the line 5-5 in Fig. 1;

Fig. 6 is a fragmentary side elevation taken in the general direction of the arrow 6 in Fig. 5;

Fig. 7 is a fragmentary elevation taken in the general direction of the arrow 'I in Fig. 5;

Fig. 8 is a fragmentary enlarged vertical section conduit 23.

taken in the plane represented by the line 8-8 in Fig. 1;

Fig. 9 is a plan section taken along the line 9-9 in Fig. 8; and

Fig. 10 is a fragmentary sectional elevation taken in a plane represented by the line IU-IIJ in Fig. 8.

More particularly describing the invention as herein illustrated, reference numeral II indicates the dome on a tank car or the like which is provided`with a flanged manhole opening I2.

Reference numeral I3 indicates a -supporting plate of the `general character disclosed in the application referred to above, such plate being locked upon the' dome member by means of a clamping unit generally indicated at I4.

The plate I3 has a vent opening I5 in which a main feed conduit I6 is` supported by means of a clamping collar I'I which in turn is supported from the plate I3 by web members I8.

The top of the main feed conduit I6 is provided with a T connection I9 through which a washing or cleaning liquid is delivered into the main conduit from a suitable source through a delivery connection 20. The lower end portion of the main feed conduit I6 is provided with a bearing flange 2I which is received in a bearing collar 22 on what I may term, a secondary feed The secondary feed conduit is carried by the bearing collar 22 and the flange 2| by a plurality of ball bearings 2 I and a threaded ring 22.

The secondary feed conduit, in addition to the bearing collar 22, comprises a connection section 24 and a nozzle feed and operating casting 25.

The lower end portion of the conduit 23 in the nozzle casting 25 is provided with a nozzle feed conduit 26, which I may also term an auxiliary nozzle supporting axle.

The nozzle supporting axle 26 is provided with ports 2l which communicate with a hub member 28 on a nozzle member 29. The nozzle member 29 is shown as comprising a pair of oppositely extending

straight nozzles

35 and 30. The hub member is provided with suitable bearings on the nozzle feed pipe and is retained thereon by means of a bushing 3| and a cap 32. 'Ihe cap 32 is secured to the nozzle in any suitable manner such as by means o-f the ears 34, and is keyed or otherwise rigidly secured to a shaft 35 which is supported by a suitable bearing 35 in the end of the nozzle feed pipe and a bearing bushing 3l in the lower portion of the casting 25 opposite the nozzle feed pipe. 'Through this arrangement the shaft 35 is driven directly from the nozzle unit.

The extending end of the shaft 35 is provided with an eccentric 39 which engages the lower end of what I may term a pitman rod 40. The upper end portion of the pitman rod is attached to a projecting arm or finger 5I formed on a pawl member 52 which is fulcrumed on a pin 53 mounted on the upper end portion of the secondary feed conduit 23.

The pawl member 52 has a vertically extending spring pawl 54 adapted for engagement with a fixed ratchet member mounted on the lower end portion of the main feed conduit and indicated by reference numeral 55. The details in the construction of this fixed ratchet member are best illustrated in Figs. 5 to 7 inclusive where it is shown as comprising a ratchet wheel 5l mounted on the main feed pipe through the medium of a hub 58. The Wheel 51 has segments 51a and 51h movable thereon and hinged so as to fold'inwardly to the full line position shown in Fig. 5 where they are out of the path of the pawl member.

Mounted below the space left by these segments, I provide a pair of secondary or auxiliary ratchet segments 59 and 59', suchv segments being adapted to engage the pawlv at an intermediate point on the pawl, and, since the linear travel of the pawl at the point where these segments are engaged is substantially less than its linear travel at the upper end ofthe pawl where the teeth on the main ratchet wheel 5l are engaged, I may make the teeth on the lower segments and 59 much smaller than the teeth on the upper segments in the ratchet wheel 51. In other words, thel

segments

59 and 59 are provided with more teeth per unit of length than the main ratchet wheel so that the increments of motion in a horizontal plane during such time as the pawl member is operating on the lower ratchet segment are smaller than the increments of motion when the pawl member engages the upper ratchet segments.

It is through this construction that I obtain the objective, hereinabove referred to, of reducing the angular velocity of the nozzle m-ember in a horizontall plane; also, as pointed out above, the unit is placed in the car so that the pawl engages the lower ratchet segment when the nozzle unit is directed toward the ends of the car. If the device is being used in a tank, the walis of which are spaced equi-distant from the location of the unit, or in a, tank which has contained a liquid which is easily removed, the segments 51a and 51h may be folded out into line with the periphery of the ratchet wheel, and under such` circumstances the unit will have a uniform angular velocity throughout its entire travel. It will be understood that, under these last named conditions, the pawl member will merely ride over one tooth on the lower ratchet segment for each tooth engaged in the ratchet wheel or in the upper segments Sla and 51h. By way of explanation it might be said that the upper ratchet wheel can be described as having four segments, namely, the two segments old and Sib which are hinged on the wheel, and the other two segments which I have indicated by

reference numerals

59 and 59 which are fixed portions of the ratchet wheel. Since the nozzle unit is secured to the shaft 35 through the cap 28, it will be seen that the rotation of the nozzle itself about its horizontal axis operates the mechanism described above for rotating the secondary feed pipe and the nozzle unit about a vertical axis.

For the purpose of rotating the nozzle about a horizontal axis in a vertical plane, such rotation being eiective to produce the rotation about a vertical axis in a horizontal plane just referred to, I provide a nozzle operating ratchet wheel 65 which is contained within a guard 66 formed in the casting 25 and is keyed to the nozzle hub. This ratchet wheel is engaged by the free end of a pawl 6l, the driven end of which is mounted on an eccentric G8 carried by a shaft 69 which in turn extends through a passage 1B provided in the casting 25 where it is supported by bearings ll. A grease cup 'I2 is provided for the purpose of lubricating and packing theshaft.

'I'he other end of the shaft 69 carries an impell-er 'f3 which is keyed thereto as indicated at M, and is contained within a guard member or housing 15 formed in the casting 25.

A pressure liquid is delivered from the secondary feed conduit 23 through a port 80 formed in the wall of the casting 25 and extending into a box 8i.. 'Ihis port in rturn communicates through a port 82 with, what I may term, an inlet chamber S3 formed in the box 8l.v

Theinlet chamber 83 contains a pressure regulating valve, generally indicated at 84, and communicates through a' port 85 with, what I may term, an outlet chamber 35. The outlet chamber 845 has an outlet port 8.7 arranged to direct a jet of pressure liquid against the vanes or cups on the impeller wheel 73.

The pressure regulating valve 84, as was hereinabove pointed out, is provided for the purpose oi controlling the pressure of the liquid forming the jet, thereby governing the speed at which the impeller is operated. In the usual operation, the cleaning liquid may be delivered to the nozzles under upwardly of eighty pounds of pressure, k

and I have found that it is desirable to operate the impeller wheel under pressure substantially less than this amount, for example, forty pounds. It will, therefore, be seen that, by providing a pressure regulating valve capable oi maintaining a liquid pressure less than the pressure in the conduit, I can maintain a uniform angular velocity in the impeller wheel and the mechanism driven thereby. The pressure-regulating valve in this form of my invention is shown as being of the piston type and comprising a pair of piston members 88 and 39 interconnected by a member 9B and normally positioned on opposite sides oi the axis of the ports 85 and `E52.

Reference numeral 9i indicates a pressurecontrolled piston connected with the piston 89 through the bar 92. The inner end portion of the chamber 83 beyond the piston 9i is provided with a port 95 which communicates with the outlet chamber 86 whereby the pressure liquid in the chamber 8v is always reacted upon the piston member 9i, the reaction of such pressurebeing op-posed by a compression spring 96 mounted in the opposite end of the chamber 83 against the piston member 38. The compression in this spring may be set to contro-1 the pressure in the chamber Sii at any desired point by means of a screw 9i. An outlet port 91 is provided in the chamber which contains spring 9? to avoid an equalization of pressure around the valve if any liquid leaks past piston 68. It will be seen that this construction provides a balanced pressure regulating valve whereby the pressure in the chamber 86 and the corresponding pressure at the outlet port Sl can be positively controlled for any amount less than the pressure of the cleaning liquid which is passing through the feed conduit to thel nozzle unit. In other words, the compression spring SiiA is adjusted so as to normally hold the piston valve member 84 in the position shown in Fig. l0 so that the pressure liquid is free to flow through the ports 80 and S5. The pressure is balanced between piston members 88 and 89 but there is a pressure on the piston 9i which forces the member @it against the action of the spring` 96. This pressure is opposed by the spring 96 and the passage between the ports will be maintained open until the pressure in chamber 83 exceeds the reaction pressure for which the compression spring is set. When the pressure fluid has a pressure in excess of that for which the spring is set, the valve may be closed completely by the pressure in chamber 63 or it may be merely closed to a point at which the pressure in chamber 33 is balanced by the `action of the spring. Assuming that the valve is closed by the fluid in rchamber 83, it will be seen that as soon as the valve closes the pressure in chamber 83 is relieved and the valve is again opened by the spring 96. Pressure iiuid admitted to chamber 83 again closes the valve so that under this latter assumption the valve may be described as fluttering between an open and closed position. In either event, the resultant effective pressure of the liquid in the jet which impinges upon the vanes in the impeller is uniform and has the value for which the spring 98 is set regardless of the pressure of the wash liquid, provided, of course, the pressure of the wash liquid is greater than Athat for which the spring is set. By means of this construction, I may operate the impeller Wheel at any desired speed obtaining a corresponding speed in the nozzle unit as it rotates in both its vertical and horizontal planes.

It is desirable in a device of this character to provide some means for indicating on the exterior of the tank whether or not the device is operating and the approximate speed of operation. Such indication in this form of my invention is obtained b-y an eccentric or crank section formed o-n the shaft 35 below the passage through the secondary and main feed conduits. This crank or eccentric member carries a collar IIJI which is mounted on the lower end portion of a rod |32. 'Ihe upper end of the rod |02 extends through a packing |04 in the top of the T member I9 and engages the underside of an indicating lever |05 which is pivoted as indicated at |06 to a short standard ID'I formed on the T member or some associated portion thereof. Reference numeral |08 indicates a supporting eye or inverted stirruppositioned over the indicating lever which is provided to facilitate handling the unit. vAs the nozzle unit and its shaft 35 rotate, the rod |02 is reciprocated effecting a corresponding swinging movement of the lever member |65 such movement being proportioned to the speed of rotation of the nozzle and the shaft 35.

It was also pointed out as one object of this invention to provide a device of the class described with a nozzle type of dome spray unit. In this form of my invention the dome spray unit is generally indicated by reference numeral IIIl and is shown as comprising a collar I I I rotatably mounted between fixed collars or flanges I 2 and ||2 on a sleeve member I|3 which is shown as being mounted on the undersurface of a baffle plate ||5 supported by the cover mechanism. The collar I I I as illustrated in Fig. 3 is provided with a passage I I5 which carries a nozzle IIE. Liquid is delivered into the passage ||5 from a connection III which in turn is connected to a flexible conduit IIB having its inlet in the rotatable secondary feed conduit 24 as indicated at ||9.

From the construction so far described, it will be seen that the position of the dome spray nozzle is vertically fixed relative to the cover member, and in order to effect a thorough cleaning of the dome it is desirable to rotate the dome spray nozzle. It is also desirable to provide a device wherein the nozzle unit may be vertically adjusted relative to the cover member. In this form of my invention, the dome spray nozzle is rotated from the secondary feed conduit, and such rotation must, therefore, be effected through means which will permit this vertical adjustment. To effect the rotation of the dome spray nozzle, therefore, I employ a sleeve I2I secured at its upper end to the collar ||I and slidably receiving another sleeve |22 which is mounted at its lower end upon a plate member |23 which in turn is secured to a guard bar |24. The guard bar |24 is secured at an intermediate point to a guard ring |25 surrounding the ratchet member 55 and is secured at its lower end portion to a bracket |26 which is formed or mounted on the casting 25 so that the plate |23 and the sleeve |22 rotate with the secondary feed pipe 24.

For the purpose of driving the sleeve |2I from the sleeve |22 and at the same time permitting vertical movement of the nozzle unit and the sleeve |22, I provide this last mentioned sleeve with an elongated slot |23 which receives a key or pin |29 carried by the outer sleeve I2I. In this form of my invention, the key |29 is mounted on a clamping ring |30 and extends through an aperture I 3| in the lower end portion of the sleeve I2 I. From this construction it will be seen that the telescoping sleeves I2| and |22 with their pin and slot connection provide means for positively rotating the dome spray unit from the secondary feed conduit regardless of the vertical position for which the nozzle is adjusted in the tank.

In cleaning a tank or the like, it is desirable to steam the interior of the tank at some time during the cleaning operation. In this form of my invention, this is effected through the medium of a steam inlet conduit |32 which projects upwardly through the cover plate I3 and communicates at its lower end with the interior of the sleeve II3. 'Ihe steam entering through the conduit |32 passes downwardly through the sleeve I I3 into the cooperating sleeve members IZI and |22 finding its outlet through the elongated slot I 28 and openings |33 provided in the bottom of the sleeve member |22. The telescoping sleeves I2| and |22 in this form of my invention, therefore, have a dual function.

It is to be understood that, while I have herein described and illustrated one preferred form of my invention, the invention is not to be limited to the precise construction as described above, but includes within its scope whatever changes fairly come within the spirit of the appended claims.

I claim as my invention:

1. A tank cleaning device of the class described embodying: a main feed pipe; means for vertically supporting said main feed pipe; a secondary feed pipe rotatably mounted on the lower end of said main feed pipe; a nozzle feed pipe mounted on said secondary feed pipe at an angle thereto; a nozzle member rotatably mounted on said nozzle feed pipe; a liquid motor supported b-y said secondary feed pipe'and rotatable therewith; means for delivering power liquid to the motor from the secondary feed pipe; ratchet means operated by said liquid motor for rotating said nozzle member in a step by step manner; and means for rotating the secondary feed pipe relative tothe main feed pipe by the action of the motor. f

2. A tank cleaning device of the class described embodying: a main feed piper; means for vertically supporting said main feed pipe; a secondary feed pipe rotatably mounted on said main feed pipe; a nozzle feed pipe mounted on said secondary feed pipe in angular relation therewith a nozzle member rotatably mounted on said nozzle feed pipe; means for rotating said nozzle at a substantially constant speed; means operated by said nozzle member for rotating said secondary feed pipe about its axis relative to saidr main feed7 pipe; and' means' for" increasing and;Y decreasing the angula'rvelocity of? said s'econdary feed pi'pe during each-revolutionthereof.

embodyingz' amain feedlpipe;- meansI for vertically supporting saidimain feedpipe; a second'- aryv feed` pipe rotatably' mounted on said main feed= pipe; a' nozzle feed' pipe`V mounted on said secondaryl feed pipe' in angular" relationther'ewith; af nozzle' member rotatably mounted on said nozzle'feed@ pipe; means for' rotating said nozzle;Y andy means for rotating said secondary feed pipe at varying angular-.velocitie'sfabout'its axisI comprisingl apawl member fulcrumed on said secondary feed pipe and adapted to move in a substantially vertical plane, means operated by said nozzle for actuating said pawl member, and vertically spaced and angularly offset rack segments non-rotatably mounted on said main feed pipe and adapted to be successively engaged by said pawl member at different points along its length.

4. A tank cleaning device of the class described embodying: a main feed pipe; means for vertically supporting said main feed pipe; a secondary feed pipe rotatably mounted on said main feed pipe; a nozzle feed pipe mounted on said secondary feed pipe in angular relation therewith; a nozzle member rotatably mounted on said nozzle feed pipe; means for rotating said nozzle; and means for rotating said secondary feed pipe at varying angular velocities about its axis comprising a pawl member fulcrumed on said secondary feed pipe and adapted to move in a substantially vertical plane, means operated by said nozzle for actuating said pawl member, and vertically spaced and angularly offset rack segments non-rotatably mounted on said main feed pipe and adapted to be engaged by said pawl member at different points along its length, the rack segments to be engaged by a portion of said pawl nearest to the fulcrum of said pawl having more teeth per unit of length than the rack segments farther from said fulcrum.

5. A tank cleaning device of the class described embodying: a main feed pipe; means for vertically supporting said main feed pipe; a secondary feed pipe rotatably mounted on said main feed pipe in coaxial relation therewith; a nozzle feed pipe mounted on said secondary feed pipe in angular relation therewith; a nozzle member rotatably mounted on said nozzle feed pipe; means for rotating said nozzle member; and means operable by said nozzle member for rotating said secondary feed pipe on said main feed pipe comprising a shaft rigidly connected to said nozzle member, an eccentric on said shaft, a pitman bar mounted at one end on said eccentric, a pawl member fulcrumed on the upper end of said secondary feed pipe for swinging movement in a vertical plane, means connecting the upper end of said pitman bar with said pawl member, a ratchet wheel fixed to said main feed pipe for engagement with the upper portion of said pawl, hinged segments on said ratchet member adapted to be folded inwardly away from the path of said pawl, and fixed ratchet segments mounted below said hinged ratchet segments for engaging an intermediate point on said pawl.

6. For use in combination with a tank having a dome thereon, acleaning device embodying: a main feed pipe; means for vertically suspending said main feed pipe through said dome; a secondary feed pipe rotatably mounted on the lower end of said main feed pipe in coaxial relation meansfor rotating said secondary' feedpipe upon said' main feed'pipe; a'dome sprayingnozzlel'rotatably mounted on saidmain feed pipe; means' for delivering liquid to said'dome spraying nozzle;A and means actuatedv by said secondary fee'd pipe for rotatingsaid domesprayingnozzle' about'said main feed/ pipe.

7: For use in combination" with' a' tank vhaving adome thereon, a cleaning device" embodying'iz' a main feedr` pipe;- means forl vertically suspending said main feed pipe through said dome; a secondary feed pipe rotatably mounted on the lower end of said main feed pipe in coaxial relation therewith; a nozzle unit mounted on said secondary feed pipe for rotation about an axis substantially normal to said main secondary pipe; means for rotating said nozzle unit about its axis; means for rotating said secondary feed pipe upon said main feed pipe; a dome spraying nozzle rotatably mounted on said main feed pipe; means for delivering liquid to said dome spraying nozzle; and means actuated by said secondary feed pipe for rotating said dome spraying nozzle about said main feed pipe, said last mentioned means including a sleeve secured at its upper end to said dome spraying nozzle, another sleeve secured at its lower end to said secondary feed pipe; and interlocking pin and slot means interposed between said sleeves.

8. For use in combination with a tank having adome thereon, a cleaning device embodying: a main feed pipe; means for vertically suspending said main feed pipe through said dome; a secondary feed pipe rotatably mounted on the lower end of said main feed pipe in coaxial relation therewith; a nozzle unit mounted on said secondary feed pipe for rotation about an axis substantially normal to said main feed pipe; means for rotating said nozzle unit; means for rotating said secondary feed pipe upon said main feed pipe; a dome spraying nozzle rotatably mounted on said main feed pipe; means for delivering liquid to said dome spraying nozzle; and telescoping means actuated by said secondary feed pipe for rotating said dome spraying nozzle about said main feed pipe.

9. For use in a device of the class described a nozzle unit embodying: a feed conduit; a hollow nozzle axle mounted on said feed conduit in angular relation thereto and communicating therewith; a nozzle member rotatably mounted on said axle, said axle having ports communicating with said nozzle member; a ratchet wheel mounted on said nozzle member; a shaft rotatably mounted on the wall of said feed conduit; a pawl eccentrically mounted on said shaft with its free end engaging said ratchet wheel; an impeller wheel mounted on said shaft externally of said feed conduit; and means for delivering a jet of pressure liquid from said feed conduit against said impeller wheel.

l0, For use in a device of the class described a nozzle unit embodying: a feed conduit; a hollow nozzle axle supported by and communicating with said feed conduit; a nozzle member rotatably mounted on said axle, said axle having ports communicating with said nozzle member; a ratchet wheel mounted on said nozzle member; a shaft rotatably mounted in the wall of said feed conduit; a pawl eccentrically mounted on said shaft with its free end engaging said ratchet therewith; a` nozzle unit mounted oni said seti-V wheel; an impeller Wheel mounted on said shaft; and means for delivering `ajet of pressure liquid fromV said feed conduit `against said impeller Wheel, said last mentioned means comprising an 'inlet chamber formed inthe Wall of said feed Con'duitland communicating through a port with the passage therethrough, a pressure regulating valve in said inlet chamber, an'outlet chamber communicating with said inlet'cha'mber and having an outlet .port arranged to ldirect a jet of pressure liquid against the vanes of said impeller.

11.7A tank cleaning device of the vclass described embodying: a main feed pipe, means for vertically supporting said main feed pipe; a secthe rotation of the nozzle.

HAROLD M. RUTH.