US2372205A - Dishwashing machine, primarily for household use - Google Patents

Description

Paienied'lvln. 27, 1945 DISHWSHING MACHINE, PRIMARILY FOR.YK i

l; i .HOUSEHOLD USE i Jrgen Hertz, CopenhagemDenmark; vested in i `the, Alien PropertyCustodian Application November 22, 193s, serial No. 241,833 In Denmark November.26,1937.

' l'Clam. '(Cl. 141-9) This invention. relates-toa dishwashing machine `constructed primarily for. household use and of that. kindwwhich has one or several liquid discharge openings, nozzles or groups of such through `.which cleansing fluid or rinsing water is discharged periodically under tne pressure from a housev water main and through the intervention ofcontrol means, in. 'such a manner rthat the machine comprises in any case certain -nozzles or nozzle groups which are periodically brought into action mutually, and .what in :the rst place characterizes the invention yis the'feature that the controlmeans which `bringabout the periodical liquid supply-to. the said nozzles or nozzle.

groups are actuated by such means `that the durations of-the periods of squirting, which periods need not .beof equalfduration, is regulated independently ofwhetherutensils `are inserted in themachineor'not. The control means employed according ,to the `invention may be driven, for example, by a driving spring or other separate driving. incanssimilar to a clock or watch, or 4by other driving means,.forrexample a` small electromagneticfmotor ldevice-` or, possibly,

a driving device operating with compressed air or water pressure and-constructed, for example.r

in `the `form of a `small turbine. The simplest way is to employ a driving spring ora small water turbinedriven vbyfwater from the house` water main, which Willnot` materially reduce the pressure inthe latter. The nature proper of the control means, or the power A- by which they are actuated have no bearing upon the main principle of the invention.. f

Theinvention makes it possible to determine the directions in which the jetsare to be ejected from the nozzles, consideringsolely the attainmentof the greatest possible mechanical rinsing effect (detaching effect by jet action). ,-f

Seeing that in any case certain of the machines nozzles are periodically in action mutually, the said nozzles are, according to the invention, disposed and adjusted in such a manner that each of them oversquirt with full mechanical rinsing effect only a portion of the machines chamber holding the utensils, but still in such a manner that the periodically active nozzles do collectively and with full mechanical rinsing effect command either the whole of the said chamber or larger portions of the same, for example a vertical middle section through the chamber, extending only to the chambers middle axis.

It is primarily only the rinsing water which is ejected through nozzles of which in any case certain are periodically in action mutually, and

if the rinsingwater` nozzles command. they whole of the-machines chamber forxutensilathen. the machine may be constructed with-a fixed carrying frame-for the utensils. If-the rinsing. water nozzles collectively command onlya `cross section through. the machine, or only theone half of such a section, the machine is constructed with a rotating vcarrying frame for'vthe utensils,

this passingduring. the `rotation through that zone in the machine which is commanded by the nozzles with full mechanical rinsing effect. The

aforesaid zone need not constitute an` integral surface. 1

Generally, the said mutually periodically active y nozzles will be employed, .possibly such nozzles iniconjunction with one or more constantly active nozzles intended solely for the squirting of the utensils with rinsing water, whereas for the squirting of the utensils with cleansing :duid constantly active nozzles are primarily employed. There is, however, nothing tonpreventtheemployment of nozzles, all of which or-some of which are periodically active mutually, for the ejection of cleansing fluid also. Y

The squirting with cleansing fluid is usually( effected prior to the squirting with water, and for the' squirting of the` utensils with cleansing fluida special system of nozzles .is used, this discharging ner jets, seeing that the squirting of the utensils with cleansing uid shall serve, in a major-degree, as a kind ofmaceration of the impurities on the utensils.

As explained, the machine is of the kind, whose nozzles for rinsing; water or cleansing fluid eject r through the pressure from a house water main.

The cleansingv agent must therefore be introduced at a place in' the pipe or pipes whichconnect ther house watermain with the nozzle or nozzles 1 which .are-intended for the ejection of cleansing4 fluid.v This is effected in thata supply device for a cleansing agent, for example soap in solid or fluid form is in a per se known manner inserted in the said pipe or pipes.

Normally, the machine according to the invention is constructed so as to comprise both cleansing iiuicl nozzles and rinsing water nozzles.

The drawing shows what is needful for the comprehension of the invention.

In the drawing:

Fig. l is a verticall section through a forni of the dishwashing machine embodying the invention.

Fig. 2 is a section through the control valve for supplying water from the house water main to the machine.

The machine has the chamber I with bottom 2 with drain pipe 8. In the chamber I, there are the trays 4 and 8 for carrying dishes or other articles to be washed, which are carried by a vertical rotatable shaft 8 suitably journaled in the chamber I. Suitably disposed inside of the chamber I is the cylinder l in which is slidably mounted the plunger 8 provided on its upper end with a rack 9 extending out of the top of the cylinder 1. This rack 8 meshes with a pinion I on a shaft II suitably journaled on the top of the chamber I, and provided with a coil spring I2. The shaft II and the shaft 8 are connected by inter-meshing pinions I3. The cylinder 1. is provided in its lower end I4 with a small bleed opening I5. The valve I6 (shown in detail in Fig. 2) is provided for controlling the ow of water from the house main I 1 to the machine. The main I1 is connected to the plug I8 of valve I6, which controls the flow of water from main will move downwardlyslowly and uniformly. Action of spring I2 causes shaft I I, through pinions I3 to rotate shaft 8 thereby rotating trays 4- and 5, while the cleansing iluid is sprayed on the articles carried by trays 4 and 5, since water under pressure now flows through pipe 20. The return of plunger 8 to its lower position, through arm 21, rod 28 and crank 29 adjusts valve I8 to close pipe 2l thereby stopping the spraying of the cleansing fluid. Valve I8 is then adjusted so that main I1 is again connected to pipe 20 and the above described action, under such circumstances, is repeated. When the plunger 8 has reached its upper limit of travel. valve I8 is adjusted to connect main I1 with pipe I8, and to close pipe 2|. Again the plunger 8 is moved downwardly under action of spring I2. Water under pressure is supplied by 4pipe I9 and con- I1 to the pipes I8, 20 and 2l. Thepipe I9 has its A end I9' connected with a conduit 22 in the plunger 8, by a packed joint, the plunger 8 being slidable along the end I9' of lpipe I9. Conduit 22 has, at its lower end, an outlet opening 23. A series of pipes 24 are provided with their ends opening through the side of cylinder 1 in such a way that the opening 23 successively connects the conduit 22 with pipes 24 as the plunger 8 moves axially of the cylinder 1. These pipes 24 are connected respectively with nozzles 24 suitably disposed in the chamber I to spray water on articles carried by the trays 4 and 5. The pipe 2n passes through a container 25 for any suitable form of cleansing agent, and connects this container 25 with nozzles 28 suitably disposed in the chamber I to spray on the articles carried by the trays 4 and 5 a cleansing fluid formed by the water and the cleansing agent. The rack 9 is provided with an arm 21 co-operating with a rod 28 to operate a crank 29 on plug I8 of valve I6.

The machine operates as follows. When the parts of the machine are in the positions shown in the figures of the drawing, valve I8 is adjusted to connect the house water main I1 with the pipe 2|. When water under pressure in main duit 22 in plunger 8, through outlet opening 23, to the pipes 24 successively as the downward movement of plunger 8 brings the opening 23 into communication with pipes 24. Through pipes 24 the water is supplied to nozzles 24' to spray the water on the articles carried by the trays 4 and 5 which rotate under action of spring I2 while this spraying occurs. When the plunger 8 reaches its lower position, arm 2 1, rod 28 and crank 29 arijust valve I8 to close pipe I9 and cut on.' the water from nozzles 24'.

I claim:

In a dishwashing machine for operation in connection with water from a domestic supply main, the combination 0i' a chamber for receiving the dishes to be washed; a rotating frame for supporting the dishes; a series of nozzles for periodically spraying liquid under pressure of the water main; a liquid control device controlling the supply of liquid to said nozzles, said device being constituted at least in part by two members o having relative motion in the axial direction, one

I1 is admitted through pipe 2|, it flows into the lower end I4 of cylinder 1, thereby forcing -plunger 8 upwardly, This upward movement of plunger 8 rotates shaft II, through rack 9 and pinion I0, and winds up coil spring I2 to place it under compression. Valve I8 is then adjusted so that main I1 is connected to pipe 20, and pipe 2I is closed thereby relieving pressure on plunger 8. The spring I2, having been compressed, re-acts as soon as pressure on -plunger 8 is relieved, and operating through shaft II, pinion I0 and rack 9, forces plunger 8 downwardly, the water in cylinder 1 below plunger 8 being slowly evacuated through the bleed opening I5, so that plunger 8 of said members having at least one outlet opening; means for supplying liquid to said opening, under the pressure of the water supply main, the other member having a plurality of distributing openings; pipes connecting the distributing openings with diiierent nozzles, the distributing openings being brought into communication with the outlet opening or openings in succession during relative movement of said members, whereby for each spraying period only certain of said nozzles are rendered operative and substantially the full force of the pressure in the water supply main is utilized for the nozzle spray; and control means interposed between the liquid control device and the rotating frame, said control means including a rack and a toothed wheel-co-operating therewith, said rack moving axially with the liquid control device and said toothed wheel being operatively connected to the rotating frame.

JQlRGEN HERTZ.

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