US2634739A - Washing machine - Google Patents

Description

April 14, 1953 Flled March 20 1948 April 14, 1953 w. R. WALKER' 2,634,739

WASHING MACHINE Filed March 20, 1948 8 Sheets-Sheet 2 00000000 VOOOGOOG .INVENTDR MlLLAmx RAILKER TTPIYFY April 14, 1953 w. R. WALKER WASHING MACHINE:

8 Sheets-Sheet 3 Filed March 20, 1948 INVENTUR WILLARD R. WALKER www T TDPNEY April 14, 1953 w. R. WALKER 2,634,739

WASHING MACHINE Filed MaICh 20, 1948 8 Sheets-Sheet 4 3,0/ l fN vL'NTmQ WILLARD RWALKBH EYES/*@FM TTURNEY Ap 14, 1953 w. R. WALKER WASHING MACHINE 8 Sheets-Sheet 5 Filed March 20, 1948 NVENTUR XIII LLAnn R. WALKER BY TTDHNEY Apri 14, 1953 w. R. WALKER 2,634,739

' WASHING MACHINE Filed March 2o, 1948 8 sheets-sheet e l [NVE NTUH WILLARD RWALKER T Tammy* April 14, 195.3 w. R. WALKER 2,634,739

WASHING MACHINE Filed March 20. 194B 8 Sheets-Sheet 7 251 INVENTUR 250 WlLLARnRWLKER T TJPNEY April 14, 1953 WR. WALKER 2,634,739

WSHING MACHINE Filed March 20, 1948 8 Sheets-Sheet 8 182 A A l WILLARD EWALKER 24a A TTUHNEY INVENTUR l l Patented Apr. 14, 1953 WASHING MACHINE Willard R. Walker, Syracuse, N. Y., assignor to Easy Washing Machine Corporation, Syracuse, N. Y., a corporation of Delaware Application MarchZO, 1948, Serial No. 115,985 9 claims." (o1. 134-182) This invention relates to washing machines, and more particularly to a machine for Washing dishes.

In dish washing machines, it has been proposed to provide a circulation of water over dishes by the use of a power driven impeller submerged or located within the lower portion of the washing compartment. Circulation of wash uid within the compartment by such means in general has failed to provide a satisfactory washing action due to failure to place a sufficient quantity of water in circulation under sufcient force and in such a manner as to reach all essential surfaces of the dishes subjected to Washing action.

The present invention is directed to a combination of elements including an impeller so constructed and arranged as to provide movement of large quantities of washing uid in a flush action adapted to reach all surfaces to be washed. The arrangement is such that a minimum amount of wash fluid is required. The invention further has to do with the admission of washing uid to a washing compartment through a central top supported spray. Additionally, the invention is directed to a control mechanism for metering the Washing fluid and for interruptingv washing action vupon opening the wash compartment lid.'

Further features of the invention have to do with cabinet construction including top deck, from which the washing compartment is substantially suspended and in which the deckv is pro-v vided With a flush top lid. Further features relate to interlocking mechanism for initially opening the lid and suspending washing operation, and other details of cabinet including a lid hinge construction and soap and other storage compartment spaces advantageously located Within the connes of the cabinet.

The invention also has to do with the simplication of the dish washing machine and cabinet construction as a whole, with a view to facilitating the manufacture thereof economically and at the same time providing durability and ruggedness.

The above and other novel features of the invention will appear more fully hereinafter from the following detailed description when taken inl conjunction with the accompanying drawings. It is expressly understood that the drawingsare employed for purposes of illustration only and are'not designed? as a definition of the limits of the invention, reference being had for this purpose to the appended claims.

In the drawings, wherein like reference charac Y ters indicate like parts:

Figure 1 is atop plan View of the dish wash' ing machiney Figure 2 is a, front elevation; Figure 3 is a transverse vertical section through the machinev taken substantially on the line 3--3 of FigureZ;

Figure 4 is a transverse horizontal section taken on the line 4-4 of Figure 3;

Figure 4a is a fragmentary view of the im" Figure 6 is a horizontal transverse section tak-l en substantially 'on the line 6 6 of Figure 3;

'Figure 7 isa fragmentary sectional View taken substantially on the line 1--1 of Figure 6, and

showing door hinge details;

Figure 8 is a fragmetary section taken 'sub-'-A stantiallyon the line 8 8 of Figure 6, showing details of the initial door opening mechanism;

Figure 9 is a vertical section taken substantiallyon the line '9-'9 of Figure 3 immediately inside the front panel and showing door and lid interlocking mechanism;

Figure 10 is a section taken on the line lll-I0 of Figures 1 and .11;1

Figure 11 is a section taken substantially on the line II--Il of Figure 10; y Figure 12 is a transverse section taken substantially on the line i2|2 of Figure 3, show' ing the lid-supported spray nozzle;

Figure 13 is a, transverse section taken on the line l3--l3 of Figure 12;V

Figure 14 is a fragmentary section taken on the line lll- I4 of Figure 1, showing the fluid connections to the spray nozzle;

Figure 15 is a broken section taken substantially on the line |5--I 5 of Figure 14, to illustrate the lid hinge details;

Figure 16 is a transverse section taken on the line lli-I6 of Figure 2, illustrating a soap compartment feature;

Figure 17 is a broken section taken on the line II-H of Figure 16, showing the hinge con-- The top deck 22 has a rear substantially upright splash panel 32 formed at its opposite ends tcprovide inclined control receiving panels 341 and.-

36. The top is provided with a circular" lid hinged as at 4|) to cover the circular` dish-.Washing container disposed immediately therebelow.

At the base, below the door panel wie prof-A vided =a foot recess 3| formed from an angle member 33 extending from. one sidewall to'the other and suitably joined thereto. asv by, anges. The sideV walls are formed with forward and rearward angle portions 25 and 21, which may be integral, or in theO-rmoangle members securedAV to the' side panels,Y tclprovide stiffness;

)In `Figure 3, the top deck 22isshown as formed:

Vwith a rectangular external depending marginal ila'ngefiadapted. to overlap the: side and front walls. A circularly extendingv and. depending flange 44 forms the upper rim. ot thel dish washing compartment 4t. The nange is oiset asat 48y andYA secured to the cylinderl wall 5t. oi the compartment $5.- Thelower end of:A the cylinder wall 50 is provided withabottom memberii.` having a. conical or sloped.Y outer portion. 54 and an annular central cone 5B within which is mountedfza' frame 58 forl journaling an impeiier shaft 6|). The frame 58 is composed efv conicalY and flat spiders 62 andft, respectively, provid@ ingsupport for spacedV bearings 66 an'd on the shaft 60., The annular trough` 12: between the inner cone- 56 and4 thev conical wall.. 54 may be slightly dished as at 14 and maybe dishedto a somewhat greater extent and pitched progres sively toward the drain'cut1et16apitch amount-1A ing to yabout a half inchy dropin level'to-the drain portfl 6, being satisfactory.v

The conical outer portion of. the bottoni` is providedwith-a pluralityv of 'bracket plates :18; also acting as bafiles, having dislr containing basket receiving, ats. Sii, the atsbeing'adapted tosupporta basket. 82 with its. bottom grid dslightly above and clear of thezimpeller-.Scarried onf. the;` impeller cone and shaftv 60. The basket is composed of upwardly extending wiresk tijoinecl byr circular wires 910. The bottom grid thereof is'formed from radial` step-like wiresV 92. joined by a plurality of circularwires94 of varying diarneter, the circular wires llfproviding.` an inclined base. for receiving glassware and cups,V it being desired that such be supported at an angle so that any flat surface thereon will naturally drain. Thev center portion of. the base. is provided with a grid cup 96 into which isv removably positionedY a perforated container 98 for holding silverware andthe like. A second basket, here'- inafter disclosed (see Figures 22, inc.), may be employed for ilat dishes, the same being so constructed as to support the iaty dishes on'ed'g'e, and tangentially arranged,V such. that water splashed upwardly from the impeller will strike thefaceV ofv the dishes substantially normal from beneath, and thus flush upwardly across the dishes.

The compartment 46 will be seen to be suspended from the top deck ange 44 through the side wall 50 and braced by means of stays |60 reaching from brackets H32 in the corners of the cabinet and secured to the spider 84. The stays extend yat a slight angle to the horizontal preferably to give the eiect of holding the compartment and.. top deck 22 clown, las Weil assteadying the impelier bearing housing with respect to the cabinet structure.

The top deck 22 is provided with a lid receiving offset |64 (see Figures 3 and 10) of a suiicient depth to receive the return bent circularedge Iiormedon the ring extension |01 of the` lid. 331i',` withv the top lid surface lying substantially flush with the adjoining deck surface. The. ring extension It? is provided with a depending skirt mi? the upper portion of which is secured to a frange of the lid 38 and the lower portion of which vextends downwardly substantiallyV thedistance of the oset 48 previously described in connectionwith.A the top deckcir-: l cular flange 44. Thelid Sais hingedf atythevrear upon yspaced hinge pins. I I2 and: I I4 received in rolled sleeves HGand ||8 formedzinrthe plate-like hinge strap #.20 whicnis securedrtothe'lidf. asseen inligY ures- 14. and: l5. The hinge pins are received stationary pin-receiving; sleeves |22. which ,arein turn spot-welded or. otherwise-v secured-` tcthe'V back panel 32 as at |724 The'sleeves |22. have forward extendingV arms. |26- and |28fhaving detent receiving. dimples |13cand |32 adaptecl.to cooperate with spring-pressed. detentvpins |34 and |36 carried in a double bent bracketisecuredk to the upwardly extendingportion. |49' of the hinge strap |2ii.. Asfw-ill, be seen, the detent pins |34 and |36v are provided withA collars |42. and idliagainst which theoppositeY ends oa compression springl |46 act.- It will also beseen.

thatthe dimples. |32 and |30 are so positioned as to. receive the detent. pinsv |42r and l-.44when` the lidisswung to a substantially'upright-'posiLr tion. A 1

The' lid' 3&3 supports substantially in thecenter thereofV a. spr-ayV nozzle |48 supplied byfwater: througzhra' duct lwiormedby the'under side of the lid and a. channel member.Y |52. The duct ex-rtends to the rear or hinged edge of thezlidf and isV enlargedY as atv |54 and terminates with-- the skirtl 08. Theskirtiisfprovided with a rectanguflar aperture |58 adapted to cooperate with a rec-l tangular rubber nipple` |53 molded to. an, apen ture: l in the top deckiangedlldminediately above. the oiset- 48. A suitable conduit |62V is` connected to the nipple |56 and is connected by a flexible'hose or other conduit lto a valve controlled source ofr supply |66-, the valve being actuated preferably by electrical means such-as a solenoid |68.

. The spraynozzle may be of inverted crown shape as at I'Hlwith one or more spiral slots |72 in the side` wallthereoi. The nozzle is rotatably secured in place upon a center screw |74 extendingv intera threaded recessv member I 16 fastened upon the under side of the lid 3%; centrallylocated within' the conduit |56; The nozzle may be formed. in any desired manner as two similar halves, and includer therebetween two similar membersV so formed as to provide opposed iden-- tical inclined internal partitions or blades |'||,1 and integral vradial vanes` |13, the vanes each having an integral curved extension forming together two halves'of anupper bearing sleeve |15,v In such a construction; two-v slots |12 Yare ein.l

ployed, such slots being located tangent'to the under side of the vanes |13. The members may be soldered, brazed, mechanically locked or otherwise secured together along the seams such as |11, to form an integral whole.

The channel member |52 is provided with a circular aperture |18 in the lower wall thereof and at its end, the aperture being in alignment with the spray nozzle H8. The water, being directed downward under pressure into the nozzle, produces rotation thereof by impinging upon the inclined partitions I'H.

Wash water admitted to the compartment 48 is agitated and thrown in substantially all directions by the action of the impeller 85. In Figure 4, the impeller is shown as comprising a conical supporting hub structure 80 to which are secured opposite impeller blades |82 and it. The irnpeller is adapted to rotate in the direction of the arrow A and in practice, may rotate at a speed in the order of 700 R. P. M, The blades are sup# ported upon slip-like brackets 83 and i 85 secured to the cone |853, and radial extensions |81 and |89 of the leading edge ends of the vanes, which are likewise secured to the cone |88.

The blades |82 and |86 differ in shape both at their trailing edges and at their leading edges as may be seen from Figures i and 4c. The leading edge |85 of the blade |82 is horizontal and is adapted to travel in an orbit slightly above and over the inner radial half of the drain channel 14. The leading edge |88 of the impeller itil is located at a somewhat greater height above the drain channel 'M and is so arranged that the active portion of the blade |89 at the leading edge sweeps in an orbit over the radially outer portion of the channel 'M The trailing edge |92 of the blade |82 is cupped inwardly so as to throw the liquid scooped by such blade across the center axis as well as upwardly in the central portion of the compartment 48. The trailing edge |9ii of the impeller blade |84 has a lesser slope and is adapted to throw wash liquid in the outer region of the compartment d6.

A basket for holding flat dishes such as plates, platters and saucers is shown in Figure 20. Such basket is formed of relatively stii wire of stainless steel or other metal noncorrosively treated, and the elements may be welded, soldered or otherwise secured.V The basket comprises a plurality of radial wires 32.2 having upstanding end portions 324 at their outer ends.

tached to the upstanding portion 321i to form a substantially cylindrical basket wall. Between the radial wires `22 are positioned additional radial stiffening wires $38.

` A plurality of return bent wire loops 332 are' positioned with the free ends 33d and 336 extending downwardly and terminating at the grid base, the outer end 334 being secured to a radial' wire in advance (as indicated by the direction of rotation of the impeller at) of the radial wire to which the inward end 33t is attached as illustrated. The loops are of varied length to accommodate Various sizes and shapes of comparatively .dat dishes, and are slightly inclined in the direction of rotation as is shown in Figure 22. 4The lower portion of the loop ends may be offset as at 338 to in effect conform to the generally wellknown shape of plates and saucers and other shallow at dishes. It will be seen that dishes in the rack will be supported in what may be termed a slightly inclined tangential arrangement, the tan- 'Ihe wires are'. tied together by a plurality of concentric wire, rings 326, forming a grid base, and rings 328 at gential arrangement being such as to place the concave side of the dishes in a direction t0 receive the full force of the upward and tangential flush of wash water set in motion by the impeller. This wash water in large quantities will ilow across the surface of the dishes in the general direction as indicated by arrow F, the inboard portion of the dish being flushed primarily by wash water from the impeller blade |82 and the out-- board portion of the dish being flushed primarily by'wash water from the outer impeller blade |84.

In practice, a limited amount of Wash liquidy will be employed, the same being retained within the compartment 46 by closure of a gate valve |96 located in the drain pipe 16. The impeller blades' |82 and 84 are arranged to throw such water with considerable force into substantially every portion of the compartment 46 and such water will thereafter drain past deectors 18 downward into the channel 74, It Will be seen that, by reason of the leading edge |88 of the blade |84 being somewhat higher than the leading edge |86 of the blade |82, only a limited amount of washiluid will be scooped by such blade and particularly the top stratas of the water contained in Thus,A there is a considerable the channel T.- layer of liquid allowed to remain in the channel which is subsequently acted upon by the leading edge |86 of the impeller |82. Thus, two impellers may be employed, each acting upon which is in' effect a separate supply of liquid and permittingsuch liquid ample time to flow into the channel lll by the edge revolution of the impeller.

Since the leading edges of the blades do not fall in the same path and do not interfere with one another in acting upon liquid received in the channel M, large quantities of liquid are thrown by the blades as compared with a two-bladed impeller in which the blades are identical. rBecause of the large quantity of liquid which may thus be thrown, the extreme velocities heretofore thought essential may be reduced because of thel greater quantity of water actually thrown into splash circulation. Impellers heretofore have been rotated at high velocity to increase the washing action, but the amount of water which could find its way to the impeller'for scooping was so slight as to defeat the desired result.

By eliminating the interference between the succeeding impeller blades as vthey move in their respective paths, that is by having them act in dierent orbits, great quantities of wash fluid are put in circulation, resulting in faster washing action with maximum cleaning eiiiciency. The channel has more timeto fill, since the blade only scoops the channel once in a revolution, instead of twice as two similar blades would.'v At the same time, the impeller may, and will be,

f any time as during its return'to the sump along the side andconical walls'. y

` It will be seen that by employing two racks, one for glasses and cups and the other for dishes, the disk raokvwill vbe loaded while the glasses and cups are undergoing the relative1y brief w'aslf cycle. within the'machinei. Immediateh': unen.- compl'etiozr of the; Washingo1vv they cups and, glasses.. theev rack` contain-ing: these items; is re moved from the .machine andthe; diskraCk; inv. sorted', after which the/washingcycle is. repeated; lit will; be.. appreciated that it be. desirable to. enzniloyA a. somewhat longer. washingneriodtortne dishes and; .that this-is undertheoornnlete centrali of: the.operator-L Y" lheiimpeller 6,8 is driven-through a.: belt drive;V

lffromi a motor Zee suitably mounted upon-.thesiffle?.members;v of; the cabinet.` side, wall 2:4., rl'he motor ismuunted: with its axis vertical, upon. a,Y

bed. pla-.te zur. the latter' being pirated. between spaced angle irons. 2&3.- secured tir the. side-wall.

2k.. only-one ciwhiclr angle-ironsis shown...

vThe ton lid-r4 due toits dushrarrangement with; the-:top: deck.; is provided. with; a lifting pin 2M (see Figure 9) adaptedltoiinitiallyraise-'the outeredge or the; lidY a sufficient distance to permit grasping the. edge by the operatorzs:` rlgors.. The pin 2.92 isliftedby a; knob-actuatedcanrilli actingu-pon aleai spring; 2.0.6., the-tree end of. whichA is ruiten-ed as atZtS to-engaee-anannular groove 210 in. the-pin Q92.. The leaf spring Zea is supportedat its other end; upon an ear 212 of. the; plate 244 theplate. also being-provided with ears 21.6 and 2 L8 havingapertures through which the pin. 202 may freely slide. rThe.- plate 2id is secured to the outer side of the angev ldd and the pin. 202 projects; upwardly throughan opening 220V in. thevr oisetz 104 to4 engage the-return. bent flange |06l of the-ringextension ll'l.

'1T-he cam 204 is mounted uponv a short stub shaft 222 extendingAA throughv a knob receiving recess 22.4 in the front panel. The shaft has aflixed thereto a knob-226.. The cam 2cd is fur-- they; providedv with. a second cani, extension. armr 2.2.8y for actuating a sliding-doorrelease bar. 23o. The bar is slidable in a guide 2.32located immediately. abovethe door andin. an ear 23.4 formed on. the plate extension member; 236. securedto the plate 2;!14. The cam armV` 228. is such that rotaticnoi they stub shaft 2.2.2, as seenin Figure 9.-, countercloclswise. the. lid is opened; whereas upon rotation of such shalt by the knob in a, clockwise direction, the bar 23.@ is lifted. A hair pin spring 23B in combination with the leaf.v spring is adapted to normally hold the arms 204 and 28I substantially in the position shown.

In. order tovr provide an interlock between the. mpeller driving, motor Zl, the lid 38, and the spray nozzle carried thereby.. to prevent, accia dental nodding of the operator by accidentalr opening, of the. lid, the pin 2il2, which is. adapted to lift. the lida slight. distanceto make, it possible to open` the. lid.. engages, at its. lowerr end. the actuating arm 2.40. of a cut-.out switch 24.2. The. cut-out switch may be. in circuit with the valve solenoid [63 as well. as themotor 226 so that the water inlet is4 outA ofi andthe. impeller action broughtto aston., It wllbe appreciated that the depending skirt. llll oV they lid is, of sufficient length tdtelescope the upper compartment Wall, to, prevent splash trom the compartment when the lid. is. elevated to the initial open position by the pin 202. The relatively slow speed. of the impeller and the damping actionof the wash water. in which it operates,4 tends to immediately bring the motor to rest so that danger of opening.

the lid too quickly is minimized.

Control of the washing. operation. is accomplished through a manually actuated timer 244. on the back panel 32 and. an` adjacent motor switch Zilli.y Acircuit. suitable for controlling. the.

Y A lid-operated switch 2,42- is in circuit-:witlrthef motor only, so thatwhile operationl of` the met-or isy immediately stopped, should the lid loe-raised for any reason, the. time cont-rolled metering; offY washwater Willnotbe interrupted by--inadvert nt.

,- opening orY slightrraising of thelid. It will be nt that; aI properamount:y of; Water be introduced into.- the.; machine and any interruption wou-.1d disturb-the action. of the timer in. providing the correct,- amount of; water. The timer 24A; includes an. electrically driven clock motor d5 which acts; to open; the switch 2-5-3 which is initiallyclosed by' the panel: knob. 2tl- A Signal light 2&9 iS. provided.- in circuit with the timer-so as to warn-the opera tor against opening; theV main control-switch 26.6; inadvertently while wasn` fluid is, bein-gmetered.l Copendingl application of Swayze,v Serial No. 793,065-, ii-led-December- 22;: 194.7, now Patent. No.. 2,562,481,y issuedvJuly 31, 195.1, discloses a. timer manually initiated such as may be employedthe circuit described.

There is also provided a drain control actuata ing the swinging gate valve 1,96 througha Bowden Wire control 2&9. comprising a cable 25|- attachedv to the lever arms 253 and Z55 on the manual knob 257 and valve i196 respectively; the conduit 259- being supported at its en d by fixed brackets 261,-.. 253-, respectively. A wide opening Valvev ofv the. swinging gate type is desirable in orderY to allow for fast drainage approaching a flush. The pitch ofthe channel. or trough 'F2 facilitates; flush op-F eration so thatv any tendency for particles of ioodi to remain in the compartment is minimized. It; will be understood that amotorV driven drain pump of large capacity may be utilized to dise. charge. waste, if,` desired, where gravity drainage is not available, or where. the drainage. would otherwise bey sluggish. If drainage is hadintoan adjoining sink of an elevated level, the Valve could4 be dispensed with where such a pump isy employed.

The timer 24.4 is connected in circuit with the inlet valve actuating solenoid lSS, and controls, by xingy the time, of flow, the. amount of. wash Water, admitted to, the4 compartment. Where Pressure ofthe line.v varies substantially. a. con-.sstant flow regulating Valve may be inserted in the 'outlet |67 oi the valve I lili.v In a normal.. washing operation, the quantity of waterJ may beV limited to approximately one gallon. The motor switch rontrolsv thev motor driven impellerVv and assuming. a proper quantity of soap or detergent and water has. been introducd into the comparte ment; the motor is` operated for approximately 3.. minutes to eiect washing operation. Thereafter. through. a manual actuation of the drain valve, the wash water is drained. Subscquentlyf,v the. drain Valve. is closed and a. .rinsing operation er-v fected, the rinsing operation resulting from the admission of rinse water through the spray and; the actuation of the impeller. Following the rinse operation, the drain. is again opened and the washing operati-on is complete. The rinsed dishes may be left in the dishwasher, and to facilitate the dryingv of` such. dishes, thecompar-.te ment is provided with avent A252 located inl the;v

rear wall near the top. The vent is inclined upwardly vto prevent leakage therefrom, but permits the interchange of air Within the compartment tofacilitate drying and to keep theairtherein fresh;.

The front wall of the cabinet can be provided Witha soap compartment 254, the same being constituted by a pivoted drawer-like construction swinging on a vertical axis. 'I'he front panel is provided with an aperture 25B to receive the drawer'258.,V Adjacent the top and bottom mar gins of the aperture 256 are inwardly struck hinge brackets 280 and 262 through which extend a hinge pintle 264. The drawer 258 has a bottom 265, a forward wall'268 having a panel 218, inside walls 212 and a curved wall 214. The inside wall 212 has a hinge bracket 216 having apertures to receive the hinge pintle264. The curved Wall 214 is cylindrical and of a curvature having uniform radius about the pintle 264. The panel 210 extends to the left of the hinge axis of the pintle 264and is Yrecessed as at 218 to receive fingers of an operator, it being observed that by pushing the recessed portion 'of the drawer, it will be swung open. A suitable latch to hold the drawer in closed position may be formed by a leaf spring member 288 supported from the side wall 24, bearing against blister 282 formed in the curved side. wall 214'. The opening movement of the drawer is limited by inwardly struck ngers 284 f and 286.1'

The access door 30 located beneath the front panel 28 may be'composed of front and back members 288 and 298 having telescopic flanges 282 around their marginal edges. The door is hung on upper and lower hingepins 294 and 236 supported in stilening plates 298 and 300. The stiffening plates are secured to a lower flange 382 of the panel 28 and to a bracket 304 secured to the recessed base, respectively. As has been previously described, the door is normally held shut by the latch bar 238 acting upon a door-carried bracket 30B. The door is adapted to be initially opened by the limited movement of a spring plunger 388 (see Figure 8) The spring plunger is mounted for horizontal movement in a bracket 3H! arranged on the flange 302 so as to bear against the inner surface adjacent the free end of the door. The plunger 388 has a compression spring 3|2 threaded on a guide rod 3M which extends through the end of the bracket 3 I 8 and is tted with an end stop 3I6. It will thus be seen that upon movement of the latch bar 230 upward to disengage the bracket 386, the door will be sprung open a short distance by the plunger 308 to facilitate its further opening by manually grasping the same.

Although a single practical embodiment of the invention has been illustrated and described, it is to be understood that the invention is not limited thereto. As various changes in construction, selection and arrangement of the parts may be made without departing from the spirit of the invention, as will be apparent to those skilled in the art, reference will be had to the appended claims for a definition of the limits of the. invention.

What is claimed is:

l. In a dish washing machine, a casing forming a. dish washing compartment, having side walls and a bottom wall, said bottom wall having an 4annular substantially nat-bottomed sump formed therein, and sloping walls extending to said side wall, an impeller mounted for rotation on an axis concentric with said annular sump,

10 said impeller having ytwo blades the leading edges of which sweep said sump, one leading edge sweeping -a path axially spaced above the other, said blades being diametrically opposed from one another. .i

2. Ina dish washing machine, a casing forming a dish washing compartment, having side Walls and a bottom wall, said bottom wall'having an annular substantially nat-bottomed sump formed therein, and sloping walls extending to said side wall, an impeller mounted for rotation on anV axis concentric with said annulansump, said impeller having two blades theV leading edges of which sweep said sump, one lleading edge sweeping a path radially inward and; axially spaced with respect to the other, said blades being diametrically opposed from one another.

3. In a dish washing machine, a casing forming a dish washing compartment, having side walls and a bottom wall, saidbottom wall having an annular substantially Hat-bottomed `sump formed therein, and sloping walls extending to said side wall, an impeller mounted for rotation on an axis concentric with said annular sump, said impeller having two blades the leading edges of which sweep said sump, one leading edge sweeping a path axially spaced Vabove the other, and one having a trailing portion adapted to impel'uid in a region radially spaccdrrfrom the other, said blades being diametrically opposed from one another.

4., In a dish washing machine, a casing form.- inga; dish washing compartment, having lside Walls and a bottom wall, said Ibottom wall having an annular substantially fiat-bottomed sump formed therein, and sloping walls extending to said side wall, an impeller mounted for rotation on an axis concentric with said annular sump, said impeller having two blades the leading edges of which sweep said sump, one leading edge sweeping a path radially inward and axially spaced with respect to the other, and one having a trailing portion adapted to impel fluid in a region radially spaced from the other, said blades being diametrically opposed from one another.

5. In a dish Washing machine, a casing forming .a dish washing compartment, having side Walls and a bottom wall, said bottom wall having an annular substantially flat-bottomed sump formed therein, and sloping walls extending to said side wall, a plurality of vane-like angularly spaced baies lying substantially in axial planes secured to said sloping Walls, and acting as supporting brackets for a dish containing basket, an impeller mounted for rotation on an axis concentric with said annular sump, said impeller having two blades the leading edges of which sweep said sump, one leading edge sweeping a path radi-ally inward and axially spaced with respect to the other, said blades being diametrically opposed from one another.

6. In a dish washing machine, a casing forming adish washing compartment, having side walls and .a bottom wall, said bottom wall having an annular substantially flat-bottomed sumpV formed therein, and sloping walls extending to said side wall, a plurality of vane-like angularly spaced baiiles lying substantially in axial planes secured to said sloping walls, and acting as sup-- porting brackets for a dish containing basket, an impeller mounted for rotation on an axis concentric with said annular sump, said impeller having two blades the leading edges of which sweep said sump, one leading edge sweeping a path radially inward and axially spaced with re- `Spent to thezother, and 4one ,havingta trailing portion adapted to .impel .ud in a .regionradially spaced `from 'the other, said bladesbeing diametrical'lyfopposed fromone another. 7. In a dish washing machine, a casing forming a :dish Washing compartment, having side iwalflsand a'bottomwall, said bottom wall having an annular :substantially flat-,bottomed sump formed therein, :an impeller .mounted .for vrotation on .axis :concentric with .said .annular rsump, .said impeller 'having two blades .the leading .edges .0f which :sweep .said sump, :one leading v.edge sweeping .'a rpath axiallyr spaced v'above .the other, 4said blades vbeing .diametrically opposed :from one another. Y

i8. V mia-'dish washing machine, a casing 'forming a dish washing compartment, .having y'side walls and 'a bottom wallfsaidbottom wall having an :annular sump, .an -im'peller` mounted for `rota-- tiondon V.an axis v'concentric with said vannular snmp, said limpel'ler'havin'g twobl'ades .the `*leading -edgesolfiwhi'ch sweep saidsump, yone leading :edge sweeping .a path radially vinward.fand axially spaced With'respec't'lto the other, saidv blades being diametrically opposed .from one another.

v9. In .a dish Washing machine, .a casing 'forming ia VYdish washing compartment, .having side Walls and Aa bottom WalLsaid bottom Wall having y'anannular sump, ,an impeller mountedifor rotation 'son an axis .concentric with 'said annular `sump, said impeller having two'blad'es .the leading

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