US3064665A

US3064665A - Dishwashing apparatus

Info

Publication number: US3064665A
Application number: US72975A
Authority: US
Inventors: Leonard J Martiniak
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1960-12-01
Filing date: 1960-12-01
Publication date: 1962-11-20
Anticipated expiration: 1979-11-20

Description

Nov. 20, 1962 J. MARTINIAK 3,064,665

DISHWASHING APPARATUS Filed Dec. 1, 1960 5 Sheets-Sheet 1 FIG. I

JNVENTOR. LEE JNARD J. MARTINIAK WA A ATTORNEY Nov. 20, 1962 J. MARTINIAK 7,

DISHWASHING APPARATUS Filed Dec. 1, 1960 3 Sheets-Sheet 2 l m INVENTOR.

LEONARD J. MARTIMAK QZb/A/W ATTORNEY Nov. 20, 1962 J. MARTINIAK DISHWASHING APPARATUS 5 Sheets-Sheet 3 Filed Dec. 1, 1960 K I mm m V WM U- D Du A N O E L BY WA.

ATTORNEY United States Patent 3,664,665 DISHWASI-HNG APPARATUS Leonard J. Martiniak, Waukesha, Wis., assignor to General Electric Company, a corporation of New York Filed Dec. 1, 1960, Ser. No. 72,975 Claims. (Cl. 134-176) This invention relates to dishwashing apparatus and in particular to apparatus having rotating spray nozzle devices in which the velocity or shape of the jets issuing therefrom may be adjusted to accommodate the requirements of the articles being washed.

Dishwashing apparatus of the type used in domestic households and small restaurants usually comprise a tub having upper and lower racks within which are arranged the articles to be washed. Ordinarily, the lower rack is loaded with the larger size plates, bowls, pots and pans, etc., and the upper rack is particularly designed to carry the smaller dishes, cups and glassware. It is desirable to have two arrangements of rotating spray nozzle devices, one disposed below the lower rack and a second located between the upper and lower rack. This second spray device may have nozzles or jet-providing structures which spray the washing and rinsing liquid upwardly against the articles in the upper rack and downwardly against those in the lower rack whereupon the heavier dishes in the lower rack are subjected to cleansing sprays coming from below and above. ,Usually, at least the lower of the spray nozzle devices is of the reaction type pursuant to which the reaction of the water streams issuing from its variously disposed nozzles causes the device to rotate to achieve maximum coverage by the washing liquid. The upper spray nozzle device is also arranged to rotate during operation and as later explained, this is preferably accomplished by coupling the two devices together by piping means through which water supplied under pressure to the first device is transmitted to the second to supply the same. This piping means also provides the drive whereby the second device rotates conjointly with the first. A particular advantage of this arrangement is that it permits the upper spray device to be mounted in a manner which minimizes connecting piping and permits each of the racks to be moved independently of the other so as to facilitate the loading of the racks.

There is an increased use of relatively light-Weight plastic materials for the smaller dishes and cups and it is necessary to provide dishwashing apparatus which will wash theselighter pieces, plus light-weight delicate glass ware, in a manner which will insure a satisfactory washing operation but not so forcefully direct water sprays thereagainst as to upset or disarrange the lighter articles in the upper rack. In order for a single dishwashing apparatus to have maximum adaptability however, it should also have. facilities for performing a heavy-duty washing operation on upper rack articles which may be of a heavier or more serviceable weight or design.

.It is therefore a principal object of the present invention to provide a dishwasher in which liquid discharge devices may be adjusted to produce spray patterns, and washing liquid velocities, which may be varied to best suit the articles being washed.

It is another object of the invention to provide a dishwashing apparatus having at least one spray nozzle device in which the discharge orifices may be adjusted to emit washing liquid in a manner which will satisfactorily wash light, delicate articles without upsetting them or otherwise subjecting them to the possibility of damage.

In a presently preferred form of the invention, I provide a dishwasher having below its lowermost rack a reaction spray nozzle device having variously disposed nozzle structures and an aperture providing for the vertical discharge'of liquid. at the axis of rotation of the r, 3,064,665 Patented Nov. 20, 1%52 nozzle. For cooperation with this reaction spray device I provide a second rotating nozzle system having means for receiving liquid through the axial discharge outlet of the first device and arranged to be rotated together with the first device. The second spray nozzle system in cludes a tubular spray arm or conduit disposed between the upper and lower racks of the dishwasher and desirably extending parallel to the base of the upper rack in relatively close proximity thereto. This conduit is provided with apertures through which the liquid received from the lower spray device is directed upwardly against the articles in the upper rack, and may also, if desired, have nozzles which spray downwardly against the articles in the lower rack. Valve means are provided in the second spray device to enable the user to adjust either or both of the nozzle systems to produce sprays ranging from heavy to light as respects the force of water issuing from the apertures, and to adjust the actual spray pattern from relatively heavy jet form to finely divided spray form. Alternatively the upper device may be substantially completely blocked off, whereupon all of the wash: ing liquid may be made available at the lower spray device so as to produce maximum washing effort against articles in the lower rack.

Other features and advantages of the invention will be apparent in the following detailed description of presently preferred embodiments, read in connection with the accompanying drawings, in which:

FIG. 1 is a side sectional elevation of a dishwasher embodying the present invention with portions of the outer casing and the tub shown in section;

*FIG. 2 is a composite view partially in section to show the mechanical relationship between the lower and the upper spray nozzle devices;

FIG. 3 is a perspective view of the upper spray nozzle device illustrated in FIGS. 1 and 2;

FIG. 4 is a sectional elevation of the device of FIG. 3 taken on lines 4-4 of FIG. 3;

FIG. 5 is a side elevation partially in section of a second form of upper spray nozzle device;

FIG. 6 is a sectional elevation of the device of FIG. 5 taken on lines 66 of FIG. 5;

FIG. 7 is a top plan View of a third form of spray nozzle device showing another form of jet adjustment means;

FIGS. 8 and 9 are fragmentary elevations of the device of FIG. 7 respectively taken on lines 88 and 99 of FIG. 7;

FIG. 10 is a fragmentary top plan view of a second form of lower spray nozzle device; and,

FIGS. 11 and 12 are fragmentary sectional views of the device of FIG. 10 respectively taken on lines 1111 and 1212 thereof.

Referring now to FIG. 1 my invention is illustrated as used in an otherwise conventional domestic dishwasher in which an outer casing 1 includes suitable structure 2 for the support of the dishwasher tub 3. The tub and outer structure are constructed to provide registering front wall openings with respect to which the door 4 is hinged at its bottom to be swingable between a normally closed vertical position and a horizontal open position.

Suitable gasket means (not shown) are interposed between the door and the periphery of the tub opening to provide for sealing against the escape of Water during the operation of the machine.

Suitably mounted on opposite side walls of the tub are upper and lower guide rails, respectively 6 and 7, which accommodate the upper roller-provided rack 9 and the lower roller-provided rack 8. As is well known in the art the respective racks are constructed to receive, in position suitable for washing, a varied assortment of the lower rack. When the door 4 is in its horizontal open position, each of the racks may be withdrawn through the front wall opening to facilitate the loading of'the dishes therein whereupon the racks are returned to their illustrated operating position within the tub. The lower rail 7 may, if desired, be provided with a rearv stop 11 to establish a fixed home' position of the lower rack. The upper rail 6 may, if desired, be sloped slightly downwardly toward the rear wall of the tub so that the upper rack 9 will also assume a uniform operating position.

A conventional time cycle control 12 is mounted at a convenient location in the upper portion of the door and by conventional and well-known circuitry is arranged to control the operating mechanism disposed in a machinery compartment 14 below the tub. The mechanism will include a solenoid valve 15 connected by means of piping 16 to the hot Water supply (not shown) of the building and supplying water to. the interior of the tub 3 by way of the pipe 17 arranged in relation to the side wall inlet fitting 18 to provide the usual 1" air gap required by plumbing codes. Also, the operating components include a pump 20 arranged to be driven 'by an electric motor (not shown) and providing for the circulation of water from the sump portion 21 of'the tub to a main water discharge pipe 22. Such recirculation system includes the inlet fitting 23 which may be provided with any suitable screening or filter device (not shown) and the pump discharge conduit 24 which directly communicates with the pipe 22. Also the operating mechanism may include a discharge pump 25 communicating by way of an inlet pipe 26 with the suitably screened drainage opening 27 in the bottom of the tub. Pump 25 has a discharge conduit 28 which communicates in any known fashion with the waste lines (not shown) of the building plumbing system. Finally, the operating mechanism may include any conventional pressure-operated switch 30 which by well-known electrical circuitry will open the circuit to the solenoid valve 15 to prevent the accumulation of more than a predetermined head of water within the dishwasher tub.

The dishwasher door is desirably provided with .a detergent dispenser 31 which is preferably of the double cup type disclosed in the Sharp et al. Reissue Patent 24,198, reissued August 21, 1956, and assigned to my present assignee. As is described in said reissue patent and now well known in the art, the dispenser 31 has two cups (not shown) in each of which theuser places a suitable quantity of granular detergent when the door is open and positions a gating device 32 to cover one of the detergent cups while leaving the other exposed. During the circulation of Water within the tub during a first washing operation the water Washes the detergent out of the exposed cup to createtherewith a suitable washing solution; During this first washing operation the cover 32 prevents the escape of detergent from the second cup. After the first'washing operation the drain-out pump 25 discharges the spent washing solution from the tub. There then follows a second washing operation; and as described in the said reissue patent, 24,198, during the drain'out interval the gate 32 has operated to expose the detergent in the second cup whereupon when a second quantity of ,water is circulated throughout the tub the detergent forms a second washing solution. According to 'a conventional operation cycle the operating mechanism under the control of the time cycle device 12 then carries out two or more rinsing operations in which clear water is circulated over the'articles in the respective racks and after the final pumping out of the last rinse water the device 12 energizes a heating unit 34 suitably arranged in the bottom ofthe tub 3 to expedite the drying Because the operating mechanism and operational cycle are not a part of the present'inventiomthey have not been described in detail. Reference however, is made to the pending application, Serial Number 685,303, filed September 20, 1957, by John D. Warhus, for Domestic Appliance, and-assigned to my 'assignee herein, for a full disclosure of the operating mechanism and the electrical control system,

The present invention is primarily concerned with means for exacting theoptimumcirculation of the washing and rinsing liquid within the tub, andin particular against the articles in the respective upper and lower racks. Accordingly, the liquid distribution system comprises a lower spray nozzle device 36 rotatably mounted within the lower portion of the tub 3 so as to rotate in relatively close proximity to the bottom of the lower rack 8; and'the upper spray nozzle device 37 disposed between the upper and lower rack ,at a sulficient height above the lower rack to be above the largest dish or platter which may be placed Within the lower rack. The upper spray nozzle device includes a single spray arm having any suitable arrangement of discharge ports, of which several are located along the upper surface of the device a as indicated by the reference 38 in FIG. 3; sidewardly directed discharge outlets 40and bottom directed dis-' charge outlets 41 best shown in FIG. 4. This arrangement of discharge outlets provides for upward sprays of washing and rinsing liquid which impinge against the articles in the upper rack, sideward sprays of liquid which add generally to the liquid distribution throughout the interior of the tub and bottom sprays of liquid which strike downwardly against the articles in the lower rack. Similarly, the lower spray nozzle device has any appropriate arrangement of upwardly directed nozzles 42; and in order to provide for the auto-rotation of the lower nozzle device 36, it has sidewardly directed discharge openings 43 at the ends of its .arms 44. By Way of the

discharge ports

42 and 43 therefore, the lower nozzle device is caused to rotate and to, spray a Washing and rinsing liquid upwardly against the articles in the lower rack. As is well understood in the art, the rate of rotation of the nozzle device 36. is substantially directly related to the pressure of the streams issuing from the FIG. 2 shows in fragmentary section the upper portion of the main supply conduit 22 .and a typical ar rangement whereby the lower nozzle device 36 is mounted for rotation thereon. Accordingly, the conduit 22 has a transversely extending bar 45 into which fitsthe logwer end of a pivot pin 46. The distribution device 36 comprises, as already indicated, the arms'44 which extend radially from a tubular hub portion 47. Extending diametrically. across the hub portion of the device 36 is a rib structure 48, which is formed with a bearing element 50 which fits rotatably over the pivot pin 46. By this arrangement the lower spray nozzle device 36 is rotatable on the pin 46 and is also capable of axial movement on said pin. The hub portion 47. is provided with a suitable sealing skirt 51 which prevents any substantial escape of liquid through the open end of the conduit 22 while providing for the rotation of the spray nozzle device 36, and its axial movement.

As best shown in FIG. 2, the hub 47 of the lower device 36 extends'upwardly to provide the cylindrical portion 52 terminating in the inwardly extending annular flange 53. Mounted on saidfiange 53 is an annular coupling member 54 of natural or synthetic rubber which provides a central discharge opening 55. Therefore, liquid entering the hub 47 from the conduit 22 will flow to the right and left through the respective arms 44 and also discharge upwardly through the opening 55, which is coaxial wtih the hub.

The-upper spray nozzle device 37 is also arranged for rotation. As presently explained this rotationneed not be the resultoflreaction, spray ports forjit is adequately driven by means of the lower distributor 36. Accordingly, the hub 39 of the upper distributor 37 is secured over the open upper end of a rigid tube 60 rotatably mounted in a vertical position within the lower rack 9. For example, as shown in FIG. 2 an upper wire 61 of the rack may be configurated to provide a loop 62 which grips the neck of the bearing race 63 which may be of metal, or plastic material such as nylon, as desired. The rack 63 has a circular groove 64 within which operate the balls 65 of the bearing. It has been found that nylon is a suitable material for the bearing balls. As is conventional, the balls are confined within a suitable cage 66 and rest upon the cup-like member 67 which is appropriately positioned axially along the tube 60 by any suitable means such as a clamp 68. The lower end of the tube 60 has an open bell mouth 79 disposed, when the rack 9 is in its home position, coaxially above the opening 55 and in relatively close spaced relation to the upper surface of the coupling member 54. It should be noted that in FIG. 2 the space relationship is somewhat exaggerated for purposes of illustration only. The wire member 71 at the bottom of the rack 8 also is configurated to provide an opening 72 within which seats a tube support member 73 clamped by any means such as the clamping wire 74 about the tube 60. It is noted that the support 73 has a frustoconical bottom 75 which makes the conduit 60 self centering in the lower rack member.

During the operation of the dishwasher, washing liquid'enters the hub portion 47 at a pressure of about three pounds per square inch gauge. The pump capacity is such that the lower distributor 36 will be completely flooded; that is the arms 44 will be filled with liquid under pressure for discharge through the

ports

42 and 43, and a substantial volume of liquid will issue through the opening 55. However, the diameter of the opening is so related to the inside diameter of the hub 47 that there is a liquid pressure exerted against the underside of the coupling 54 which lifts the entire distributor 36 upwardly along pivot pin 46 to bring the surface of the grommet firmly against the bell mouth 70 of the tube 60. Actually, the upward pressure of the coupling against the tube 60 will lift the tube until the balls 65 set within the groove 64. This lifting will obviously lift the lower mounting device 73 out of engagement with the ring 72 whereupon the tube 60 is supported by the lower distributor 36 and by the upper ball bearing. Not only will the tube 60 and its associated upper spray nozzle device 37 be supplied with liquid by way of the hub 47, but the rotation of the lower distributor will produce a conjoint rotation of the upper spray nozzle device 37.

In furthering the objectives of the invention to provide for accommodating the upper jet spray to themture of'the articles in the upper rack, I provide in the embodiment illustrated in FIGS. 3 and 4 a valve structure including a rotatable plate 78 arranged at the intersection of the hub 39 and the lateral passage of the spray nozzle itself. Said plate is advantageously a 180 segment of a cylinder arranged for manual rotation. The upper web 80 of the valve has a cylindrical hearing 81 passing through the upper wall of the spray noz- .zle device, and mounts any suitable adjustment knob 82 on its threaded end. A seat 83 is provided to guide the valve. FIG. 3 shows the knob adjusted, to a fullflow (high) position in which the gate valve oifers no obstruction to flow into the lateral passage of the spray nozzle device. It will be obvious that with the knob rotated 90 in a clockwise direction the plate 78 would block 011 a portion of the lateral passage to restrict the flow through the ports 38 and 41. This would constitute an intermediate or low discharge pattern. Rotation of the knob 180 from its FIG. 3 position would place the plate to substantially restrict the discharge of water from the spray nozzle 37.

Restriction of liquid flow into and through the spray nozzle device 37 will, of course, increase the water pressure within the lower nozzle device 36, for the output of the motor driven pump 20 remains substantially constant. The resulting increase in the rate of rotation of the lower device 36 is transmitted to the upper spray nozzle device 37, thus increasing the throw of liquid from the nozzles thereof to compensate in substantial measure for the lessened water flow issuing from the nozzle apertures.

In the embodiment shown in FIGS. 5 and 6 a second form of upper spray nozzle device 85 comprises a cylindrical outer tube 86 having any suitable arrangement of passages 87 therethrough and an internal cylindrical valve 83 arranged to be rotated by the knob or cap 90. Said cap is operatively associated with the cylindrical valve by means of the shaft 91 and spider 92 or by other conventional means. A detent 93 may be provided to frictionally bear against the cap 90 and thereby maintain the adjusted position. The valve 38 is provided with one or more rows of ports which according to the rotational position of the valve will register with the ports 87 in the outer sleeve 86. As shown the ports of the valve 88 may have various shapes and angular relationships as well as flow capacities, whereupon, when a set of ports is brought into registry with the ports 87 a varying discharge pattern may be released. 'It will be understood that the outer ports 87 will have a flow capacity equal to the flow capacity of the largest valve port to be brought into registry therewith and will also have sufiicient area to accommodate a valve port such as shown at 96 which would be in an angular relationship to the longitudinal axis of the spray nozzle device 85. Purely for purposes of illustration, a port 94 would produce a vertical jet-like discharge through its registering port 87 whereas the cylindrical ports 95 would produce vertical cone-shaped discharges of water. It will be understood that the nozzle spray device 85 is formed with a hub portion 97 which would fit over a supply tube such as the tube 60 of FIG. 2.

FIGS. 7, 8 and 9 show another form of port adjustment for an upper spray nozzle device 100. The single spray arm comprising this device may be substantially rectangular in cross section and be supplied with liquid through its hub 10 1 which securely fits over a conduit such as the conduit 60. In the FIG. 7 embodiment the upper wall is provided with the frusto-conical ports 102 with which co-act valve elements 103. Said valve elements are preferably mounted on angularly extending spring carriers 104 secured at one end to the upper wall of the spray device. To accomplish the displacement of the valve elements 103 relative to the respective ports 102, I provide a camming mechanism 105 which may consist of parallel rods 106, 107 slidably extending through a transverse rib 108 at the end of the nozzle device and having cross members 110 in overlying relationship with the valve spring members 104. A threaded cross member 111 cooperates with an adjustment screw 112 guided within a suitable boss 114 rising from the end portion of the nozzle device. Any suitable knob or screw head 115 may be utilized to provide for the manual rotation of the screw. It will be obvious that rotation of the screw in one or another direction will effect a lateral translation of the camming member 105. Movement of the camming member to the right of FIG. 7 will cause the camming bars 110 to urge the valves 103 into a flow-restricting relationship with the ports 162 and effect thereby a throttling of the flow to produce a fine spray-like discharge. Reverse operation of the screw to draw the cam 105 to the left will release the valve members 104 to permit the spring bias thereof to withdraw the valve members 103 from the orifices 102 to produce another shape or velocity of discharge through the orifices. It is thought to be desirable to provide a plurality of bosses 116 on the surface of the spray nozzle device to act as guides or cradles for the cam 105.

Referring now to FIGS. l0, l1 and 12,1 have shown a liquid to the upper spray nozzle device.

7 somewhat modified form of the lower spray nozzle device, in which all elements in common with that. of FIG. 2 have. been given reference characters to whichthe subscript a has been added. The'distinguishing feature of the spray nozzle 36a of the FIG. embodiment resides I in the provision of spring biased deflectors 117 over at leastsome of the upwardly facing discharge ports 42a. In a dishwashing apparatusin which the upper spray IlOZ? zle device of FIG. 7 is used in connection with the FIG. 10 device, for example, adjustment of the valve members 1% to permit maximum flow of water through the ports 162 would reduce the energy of flow of water through the ports 42a, and it may be assumed that the deflectors 117 will be substantially in their FIG. 11 and 12 position. This would produce a specific form of spray pattern discharging from the ports 42a. In some situations, it may be desirable not to have any articles in the upper rack, and to direct all washing operations to the lower rack. This might be the situation where pots and pans were being washed. Closing the ports 1020f the upper spray nozzle would make substantially all of the liquid entering the lower spray nozzle 36a available for washing the articles in the lower rack. Such an operating situation would cause the liquid to discharge with great force through the apertures 42a whereupon the deflectors 117' would be angularly displaced as suggested by the broken lines of FIG. 7, to'produce a spray pattern having an upward conical discharge from those ports 42a not equipped with deflectors, and the displacement of the deflectors 117 would produce an abnormal discharge. pattern from the remaining ports to obtain a pattern which may be well adapted to the arrangement and type of ware in the lower rack.

In recapitulation, the present invention provides water distribution means for a dishwasher or the like, comprising a lower spray nozzle device extending horizontally below a dishrack and an upper spray nozzle device extending horizontally above said rack, with the respective spray nozzle device coupled together for conjoint rotation by means of the conduit which supplies the washing The invention further provides means for adjusting the spray discharge from the upper spray nozzle device, with the further provision of efiecting an adjustment of the lower spray pattern as a result of the increased or decreased rate of discharge from the upper spray nozzle.

While there have been described what are at present considered to be the preferred embodiments of the invention, it will be understood that various modifications may be made therein, and it is intended to cover in the appended claims all such modifications as fall Within the true spirit and scope of the invention.

1 claim:

1. .A dishwashing apparatus comprising in combination, a tub, rack means in said tub to receive articles to be washed, a spray nozzle device disposed within said tub, said nozzle device including a conduit having a plurality of apertures positioned to discharge liquid against the articles in said rack to wash the same, means for mounting said spray nozzle device for rotation relative to said rack, means for supplying said spray nozzle device with liquid under pressure, valve means on said spray nozzle device for controlling the issuance of liquid through said nozzle apertures, means for rotating said device at speeds which vary inversely as issuance of liquids through said nozzle apertures varies, and means for adjusting said valve means.

2. A dishwashing apparatus comprising in combination, a tub, a rack in said tub to receive articles to be washed, a spray nozzle device disposed within said tub, said nozzle device including an upstanding supply tube, means for rotating said supply tube relative to said rack, a spray arm having a hub adjacent oneend thereof, said hub being afllxed to said supply tube in communication therewith, said spray arm extending angularly frorn:sa.id:supply tube in parallel relation to said rack and having a plurality of apertures positioned to discharge liquidagainst the articles in said rack to wash the same, meansfor'supplying said supply tube with liquid under pressure, .valve means disposed within said hub remote from said spray arm apertures for'contolling the issuance of liquid through said, apertures, and means on said spray arm for adjusting said valve means. 7

3. A dishwashing apparatus comprising, in combination, a tub, upper and lower racks in said tub to. receive articles to be washed, said racks being in vertical spaced relation, a vertically disposed supply tube extending throughsaid lower rack to a point below said upper rack, means for mounting said tube in said lower rack for rotation relative thereto, means connecting with said tube at the lower end thereof to supply said tube with liquid under pressure, said connecting means also effecting rotation of said tube, a single spray arm aflixed to said tube at the opposite. end thereof and having an opening to receive liquid there.- from, said spray arm extendinglaterally intermediate said upper and lower racks and havingdischarge orificesdirected toward said upper rack to wash the articles contained therein, valvemeans comprising a valve plate extending laterally of said spray arm between the opening of said spray arm and said discharge. orifices and rotatably mounted within said spray arm' at the juncture of said supply tube therewith, and means on said spray arm to rotate said plate selectively to positions establishing a flow from said orifices appropriate to thetype of the articles, in said upper rack.

4. A dishwashing'apparatus comprising. a tub,..upper and lower racks therein to receive. articlestobe washedza supply tube extending vertically within said tub substan- ,tially centrally thereof, means for mounting said tube for V rotation relative to said racks, a rotary spray nozzle device in said tub below said lower rack, means for supplying said device with liquid under pressure, said device having orifices to eject liquid against articles in said lower rack and to induce said spray nozzle deviceinto rotation, means for mechanically engaging said spray nozzle device to the lower end of said supply tube to supply liquid thereto while rotating the tube,a spray arm fixed to the. other end of said supply tube to receive liquid therefrom, said spray arm having orifices arranged to discharge liquid against articles in said upper rack, and valve means in said spray arm at the junction therewith of said supply tube,

said valve means comprising a semi-cylindrical plate dis posed for rotation coaxially with said supply tube,.and means accessible from above said spray arm' for rotating said plate to establish a discharge of liquid from the orifices thereof appropriate to the type of the articles in the upper rack.

5. A dishwashing apparatus, comprising a tub, upper and lower racks in said tub to accommodate articles to be washed, said racks being in vertical spaced relation, a'first spray nozzle device disposed in said tub below said'lower rack, and second spray nozzle device disposed intermenozzle device and the discharge of liquid through the ori fices thereof may be influenced thereby, deflector means disposed in the path of liquid flow from at least someiof the discharge orifices of said first spray nozzle device, said deflector means being configurated'to. divide the stream issuing from the said orifices, andresilient means for mounting the. deflector means on said, spray nozzle device, whereby the spray pattern from said-'deflector-provided orifices will be established at least in part by the extent of 9 1% the displacement of said deflector means under the force 414,346 Wainwright Nov. 5, 1889 of the streams striking said deflector means. 821,250 Miller May 22, 1906 1,977,977 Walker Oct. 23, 1934 References Cited in the file of this patent 1,979,504 Tafel Nov. 6, 1934 W 5 2,461,617 Waters Feb. 15, 1949 UNITED STAQ PATENTS 2,629,390 Walker Feb. 24, 1953 394,920 Hallowell Dec. 18, 1338 2,934,074 Low Apr. 26, 1960