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Publication numberUS1638549 A
Publication typeGrant
Publication dateAug 9, 1927
Filing dateNov 7, 1921
Priority dateNov 7, 1921
Publication numberUS 1638549 A, US 1638549A, US-A-1638549, US1638549 A, US1638549A
InventorsOhmart Grayston L
Original AssigneeOhmart Grayston L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dishwashing machine
US 1638549 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

- G. l.. oHMART I 'DISHWASHINQ MACHINE Filed Nov. v. 19.21 s sheets-sheet- 2 -INVLNTOR mn L. ff/Waff BY v ATTORNEY.

Aug. 9, 1921. 1,638,549 G.l L. OHMART DISHWASHING MACHINE .Filed Nov. v, 1921 6 sheets-sheet 3 INVENTOR. mjsfa Z. /mw.


Aug. 9, 1927.

G. 1.. -oHMAR'r DISHWASHING MACHINE Filed NOV. '7. 1921 '6 Sheets-Sheet 4 1N V EN Tbl?. 4 v 'rfffn Z. 077/270022 .II 'Il .Il Il III ATTORNEY.


1921 v 6 Sheets-Shut 5 I N VEN TOR.


G. L. CHMART v DISHWASHING MACHINE Filed Nov. 7, 1921 6 Sheets-Sheet 6 Aug. 9 1927.

Patented tug. 9, 19277.

1 l i538, UNITED STATES risp-[IgM OEE enavsron L. or, on nn'rnorr,'ncme Appunti-on mea timmer a, 192i. ser-m ne. assess.

jected through a portion of the washing 'chamber that is not reached by the other jets, that is to say', the jets are arranged so that in rotatin chamber one jet fo lowing the preceding jet does not strike exactly the saine spot but is intended to have an effective swing that does not exactly coincide with the jets that have gone before in the cycle of rotation. In this way almost every unit of the washing chamber is subjected to a high velocity Water jet so as to more effectively cleanse andV wash the dishes.

Another important improvement in this revolving spray washing machine is that no nozzles are used. @imple perforated spray arms are used at the bottom while a perforated spindle with rose heads serves to distribute the water through the upper dish racks. This is an important improvement overY a revolvingspray having nozzles carried on the spindle for it permits suitably formed dish racks to be threaded easil over the upstanding spindle and the rose eads. This enables the washing chamber to be charged'with the racks from 'the top, which is ,moreV convenient and eliminates 'the trouble of side closure which may result in j leakage.

Another inflport'itan:l improvlemeilnxtt'7 is the arrangement` or isc aroing t e water when the washing operation is finished. By turning a valve the water instead of being pumped to the revolving spray is pumped out of the machine and may be discharged through a lexiblehose to a sink or any the -pulnp connectmn ,othera convenientpoint of discharge.

The water is strained by a special form ofdremovable 'strainer which is`ble froml-the outside of the machine without o Y any doors, slides, or reaching into t elnachine.' Y Y led th e revovm s ray 1s coup u w1 g P bya detachahfe through the washing pling which ermits the entire spray to be removed eas` y at anytime for cleanmg.

These and other features will be better'un derstood when a full description of the nia-- chine is given.

ln the drawings,-

Fig. 1 is a perspective'showing the, outside of the machine and showing how the samemay be-moved Aup to a sink to discharge the dirty water after a washing.

Fig. 2 is a vertical-cross section of the machine. v

Fig.- 3 is a section taken on the lineS--S- of F1g..2, part of the bottom of the wash-A ing chamber being brolen away.AY

Fig. 4 is a plan view of the upper dish rack showing the dishes in place.

Fig. 5 is a fragmentary section showing how the cover forms a tight joint with the side walls of the fmachine.

Fig. 6 is Va cross section on'the line 6 6 Fig. 7 a fragmentary. vertical section of the strainer sump and the parts of the machine adjoining. v l

Fig. 8 is a section on the line 8-8 of ig. 9 is a plan view of the lower dish rack. A i

Fig. 10 is a'vertical section of the rotating`spindle.: j

ig. 11 is an enlarged section of the spindle at thebottom showing'the coupling with the pump connection.

Fig. 12 is an enlarged vertical section of,

the lower rose head showing in detail the position ofthe'jet orifices.

Fig. 13 is a diagrammatic'pr plan view ofthe revolving spray showing the arrangement of jet o enings so as to cause each )et to reachV a di erent territory vin the washing chamber. i

Fig. 14 is a cross section taken on the line 111-14 of Fg.'13.

Fig. 15 is a cross section taken. on the line 15--15 of 13.

The operating parts are contained within a neatly constructed cabinet that is Ysquare in horizontal cro section, as appears in Fig. 1. Preferably the outside walls are sheet metal enameled in any suitable color. The corners are reinforced and ornamented by nickel plated strips a. A closureor lid is carried by strap hinges c which also carrythe arms b whichact as a stop for the Y rolled over the floor on the casters d (Fig.

2 The cover is made of sheet metal, as 1s own in Fig. 2, and on the under side near the outer edge it'isgrooved and corru ated as at e to titti htly over the rounde top ofthe side w v o f the cabinet. This is clearly shown in Fig.' '5J-The upper] part ofthe cabinet is provided vvwith* a waters Oblique' P tight dish washing chamber having the inclined floor The lower part` of the cabinet serves as a Yhousing for the motor M andthe centrifugal waterpump g'. This pump takes water from the pipe It which is connected with the strainer sum The strainer sump is simply a cylindrical sump'set on an oblique axis and provided on its upper end with a metal seat j that is provided with an inner surface inthe form of the frustrum of a cone. An

eway'k in the side of the cabie. strainer sump with the exnet connects terior.' This permits a s ecial form of strainer such as shown iii-Fig. 7 to be used and which may be removed from the exterior. of the machine without in' anyway reaching into' it. The strainer is a cylindristrainer. The water. is takenV through thev cal screen m.V carried on a spider n which is connected by a stem orwith an obliquely-set plate p. This plate is obliquely set to the axis of the strainer and stem but on the exterior of the machine is simply a Hat plate, as shown in Fig.Y 1, provided with a center depression leaving Aa strap vby which the strainer maybe grasped. is arrangement the strainer to be removed without vopening the machine'or removing the dish racks and at the same time avoids all unsightliness on the exterior of the machine. Furthermore, the mouth of the passage-way througll; which the strainer is removed is located` 'gheno h above the bottom of the ipe h. into the pump g is then forced up lrilte'aV casting or fixture s, then through suit able-pipe connections t u into the coupling head u (see Fig. 11.). e coupling nut 'v f screws onto this'coupling head with an interposed graphite bearing washer `w. This secures' the revolving. spray in place by reason of the flange a: onthe lowerY end pf the revolving spray. Th'r flange iscarried on the ipe section y that screwsinto the pipe coup g z and at the u perend of the ipe coupling the vertical tu 1 is screwed, w ile thehorlzontal lspray arms 2 and 3 are fixed 'in the side of the coupling. The vertical spindle ismade up of -three tubes or pipe sections connected by two couplings or rose heads 6 and 5, upper and lower respectively.. These three tubes and the two couplings or rose heads form the vertical spindle of the -revolving spray. VThe upper and lower tubes or sections are perforated to form jet openings 4 and' 5. The jet openings of a, single tube are in vertical lines opposite each other but note that the openings areV staggered on opposite sides of the tube. lThis means that each of the upper and lower vertical tubes will throw horizontal jets but they will strike at diilerent heights as they rotate, no two jets striking at the vsame height. In Fig. l2 the arrangement of the jet openings in the rose 'heads is shown.

Each of these rose heads throws .two fan shaped sprays' 0f water.l -The lower rosei head 5 throws upwardly while the upper rose head 6 throws downwardly. Thisris shown in Fig. 10. Now referring to Fig.

12, it will be seen that this line orfan -ar-` t rangement of jets is illustrated and that one line or fan arrangement is .located diametrically opposite the other on the rosehead. However, the individual jet openings on opposite sides of the rose head are staggered. Note the degrees at whichthey are set.` The jet openings of the spray arms 2 and?, are

bored obliquely and oppositely directed on the Atwo arms so as to rotate the spray upon the re-action principle (seeFigs. 14 and 15).

Now referring to Fig. 13, which is a diagrammatic View, it will be seen that .each line of jet openings is arranged'so as to complcment the other in an attempt to reach as A even a distribution of water throughout the dish washing chamber as possible and to cause eachjet to reach Vits own territory and not duplicate the territory reached by some other jet as the various jets revolve aroundA in their cycle of operation. Note that the` upwardly-projected jets of the horizontal arms 2 and 3 are in lines nearly opposite each other at degree points, (the lines are slightly offset to rotate the spray). The

plane of the jet holes in the upperrose head is 30 degrees removed at each side fromthe upward spray; The plane of holes inthe lower rose head is 60 degrees removed fromV Aeach upward spray and 90 degreesremoved from each-fan of waterfrom the upper ros head. The plane of the jet holes intheup# perand lower vertical tubescisrfl vdegrees removed from each of the Vfans A of 'Wzl-ter from the upper and lower "rose .headsz and Y 75 .degrees removed from eachV upward spray. This means that vnone 'of the'jetsV strikes exactly the sameterritory Vthat the other jet does in, its. cycle off operation. Even `the arrangement of theA jet` openings la', l

on the horizontal arms'is staggered 'on op posite sides of the vertical spmdle, that is,

i-,esatao each jet hole is a di'erent distance removed plates from. .40.

from the center of the spray.

' The top dish rack or basket is a wire basket in the form of a shallow cylinder with two rails 7 and 8. These extend only part way around the circle. The inner rail 8 is the lower and located upon anL arc of. smaller diameter, while the outer rail 7 is the higher and located on an arc of larger diameter. These two rails are very nicely calculated to hold up glasses and cups, as is shown in Fig. 2. The glasses may be rested' with their open ends on the lower rail and their upper ends resting on the top of the higher rail 7 so as to tilt them in such position as to have their openings directly ace'thespray. In the same way the cups may be set on the outside of the higher rail 7 between the glasses Aor other vessels held between the two rails. This will bring these cups directly` in the path of the horizontally-projected jets of the upper tube and the upwardly-projected `jets from thelower rose head. VThe side ofA the upper basket which is not occupied by the rails 7 and 8 may be used to hold large plates, :1s-shown in Fig. 4.

The lower basket or rack is intended to.

take flat ware and is provided with a plurality of circular rails ofl gradually increaslng height from the center outward (see Fig.

2). These are arranged to take the flat ware.

which can be set edgewise and 'substantially vertically between these'concentric rails. i `At the center of the lowerrbasket is a ring 9 that reaches the top of the basketand -is held up by the uprights 10. 'Ihis forms a center support for the upper basket and also the uprights 10 form a guard to 'prevent the dropping over onto the revolving spray.- Likewise the uprights 11 on the upper basket form a guard to prevent the dishes in the upper baskets Yfalling on the revolving spindle. These rings on the u right form a convenientway oi grasping tige racks when charging or removing the baskets rom the cabinet.

This arrangement of rose heads and baS.- kets is important. By utilizing the jet openings in the rose heads, drilled on radii from the common center, a fanshaped sprayv of waterris secured. This fan Vshaped spray of water secures substantially the results that would be obtained by having nozzles part way up on the spindle or at the top of the spindle for throwing the water upwardly or downwardly in vertical or oblique lines. With such nozzles the washing chamber could not very well be charged from the top.

However, by employing' these rose heads with rose head occupies solittle space that the baskets may be threaded over the upstanding spindle and the rose heads.

The water is thrown with a high velocity 4pump g.

spindle provided with through the jetop'enin s byreason ofvbeing forced into the spray pressure from the This separate pump carried on the machine itself enables the machine to be operated with water in which a suitable washing compound has been introduced. The

hot water with the washing compound is Aintroduced into the top of the cabinet, the

pump is started, :andit pumps the water out of the bottom ofthe-'washing chamber and through the spray, in the meantime straining it. When the d isheshave been suiiiciently sprayed to remove all the soil, the machine is moved over to a sink,vas shown in Fig. 1, and the hose 13 turned into the sink. The valve handle 14 is turned and this through the stem 15 throws the three-way valve 16, which'turns the water from the pump into the discharge hose 13, and the pump quickly pumps out all the dirty water. The strainer may then be removed and cleaned and the same may be replaced and a uantity of rinsing'water' be thrown into t for rinsing the dishes.

washing operation. The machine may be pumped dry again by simply turning the valve.

f The wat-er runs down through the strainer m into sump z', lthence itis pumped 11p into the vertical spindle, the horizontal lines and the rose-heads from which it issues through the jet openings.

What I claim is:

e machine This completes the 1. In adish washing machine, the combi-4 l nation of a cabinet' rovided with a washing chamber and a revo vingl spray having horizontal arms at the bottom provided with lines of upwardly-directed jet openings on the rear sides of said arms, and a vertical rose heads having jet openings, the said s indle also having jet openings in its sides, t e 'et openings in the spindle and in the rose eads arranged in vertical planes angularly with respect to the jet openings in the horizontal arms.

2. Ina dish washing machine,

chamber anda revolving spray having horizontal arms with upwardly-directed lines of jet openings, and a rotating vertical spinthe combinationof a cabinet provided with a washingv vd'le provided with rose. heads h-aving jet` v openings, said y spindle being provided with et openings, at its sides, said jet openings of the spindle and the rose heads being ar-,

ranged in lines angularly removed with respect to the lines of jet openings in the horizontal arms and with respectto the lines 'of jet openings in one another.

3. In a dish washing machine, acabinet provided with a washingchamber and a'rotatingspray including a vertically rotating spindle lhaving a air Aof rose heads each drilled with a vertical line of diverging jet openings, one for projecting water 1n a fanlike arrangement upwardly and the` other in a fan-like'arrangement downwardly, the two lines of jet openings being angularly removed .from each other.

4. In a 'dish'washin'g machine, a cabinet provided with a washing chamber, arevolvmg spray rotated by one or moreerforated horizontal arms at the bottom an havin a central vertically rotating with'a pair of rose heads, e u which throwsJ a fan-like spray and the lower one of which throws a fanlike spray upwardly, and a pair of skeleton dish baskets vthat can be threaded over the spindle and rose heads and supported in the chamber above the horizonta arms;

5.'In a dish washing machine", a cabinet having a washing chamber, a revolving spray rotated by one or more. perforated horizontal arms at the bottom provided with -vertically directed jet' openings and provided with a central vertical rotating spindle having laterally-directed jet Qpenin s and a pair of rose heads on the spindle, t e lower one of which throws a fan-like spray of Water upwardly and the upper one rof which 1throws a fan-like spray of water down- Wardly, and a pair of dish baskets which can be threaded over the spindle and the rose heads and supported in the chamber, both 4above the horizontal arms and one above the'lower ros'ehead.

6. In a dish washing machine, va cabinet provided with a washing phamber, a spray therein, a pump llocated outside the washing slpindle provi edt per one ofy ownwardly 7. In a dish washing machine, a cabinet provided with a washing chamber and having a strainer 'sump and a passage-wa leading to the strainersump, a spray wit in the chamber, a pump outside of the chamber for taking water out of the strainer sump and delivering the same to the spray, and a cu like strainer carried on a long stem and lili):- ting into the strainer sump and the stem passing through the oblique passage-Way to the exterior of the cabinet. i Y

8.' In a dish-Washing machine, a cabinet provided with a washing chamber and having an oblique strainer sump and an oblique passage-way leading from' the side wall to the sump, a spray located in the l'Washing chamber, a strainer located in the strainer sump provided With-a long stem reaching through the oblique passage-wayl and provided with an oblique handle plate o n the outer end of the stem which lits the side 'wall at the outside of the cabinet, and a pump for taking the Water from the strainer sump and returning the sameto the spray.

In testimony whereof I aliix my signature.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2491175 *Sep 6, 1944Dec 13, 1949Dowsing Company Electrical ManDish and like washing machine
US2754835 *Oct 23, 1953Jul 17, 1956Medical Equipment LabApparatus for cleaning hollow tubular elements
US2824648 *Aug 1, 1955Feb 25, 1958Bear James HDishwashing machines
US3058479 *Jan 4, 1960Oct 16, 1962Waste King CorpDishwasher
US3144034 *Sep 19, 1961Aug 11, 1964Whirlpool CoLiquid spray apparatus
US4135532 *Apr 11, 1977Jan 23, 1979Ernest RutherfordDishwasher
US5433231 *May 31, 1994Jul 18, 1995Weaver; Myron G.Removable scrap trap for dishwashers
US6044852 *Jul 7, 1997Apr 4, 2000Landa, Inc.Parts washer
US6938627 *Dec 19, 2002Sep 6, 2005Samsung Electronics Co., Ltd.Dishwasher
EP1380249A2 *Dec 19, 2002Jan 14, 2004Samsung Electronics Co., Ltd.Dishwasher
U.S. Classification134/111, 134/176
International ClassificationA47L15/14, A47L15/23
Cooperative ClassificationA47L15/23
European ClassificationA47L15/23