US1529770A - Dishwashing machine - Google Patents

Description

March 17, 1925. 1,529,770

- H. F. CAVANAUGH ET AL I DISHWASHING BACHiNE Filed 001;. 4. 1922 2 Sheets-Sheetl March 17. 1925'. 1,529,170

- H. F. CAYANAUGH ET AL Y Y .DISHWASHING MACHINE Filed Oct. 4. 1922 2 Sheets-Sheet 2' I amen-tors 2% do Lui i?! Cale/e7 v ZVZYQW 351 e machine in position when washing PutentedMar. 17, 1925.

UNITED STATES PATENT. omen.

HARRY I. CAVANAUGH AND THEODORE S. HALL, OI OAKLAND, AND EDWIN S. CUL- VER, OI PIEDIONT, CALIFORNIA, ASSIGNORS .10 SURGE! MANUFACTURING CO'M- PANY, OF EIEBYVILLE, CALIFORNIA, A CORPORATION OF CALIFORNIA.

msnwn'snmo imcnmn To all whom it may concern:

Be it known that we, HARRY F. CAVA- NAUGH and Tunononn S. HALL, residing at Oakland, county of Alameda, State of 5 California, and EDWIN S. CULvEn, residing at Piedmont, county of Alameda, State of Californimand citizens of the United States,

have invented new and uwful Improvements in Dishwashing Machines, of which the following is a specification.

This invention relates to a dish washing machine and epecially to a machine of the portable type.

I The object of the generally improve an simplify machines of the character described; to provide a machine which is particularly adapted for use in hotels, restaurants and like places, where dishes must be handled rapidly and in large quantities, and where the dishes are rinsed, scalded and dried by themselves after washing; to rovide a machine which is portable to permit it to be quickly and readily moved from one tank to another, etc., and which may be placed in any suitable manner in a tank or receptacle regardless of drain connections or the shape of the tank; to provide a machine which is motor-driven; v and further to provide novel-means for efficiently circulating water, and for producing a flattened fan-like discharge whereby the water may be cfiectivelydirected through the dishes and circulated through the tank in such a manner that an underflow and an overflow return current is produced, the latter not only washing the dishes in the rear, but also skimming the surface of the wash water, thus removm'g scum, suds, fatty matter, etc., which would otherwise collect 'on the dishes when withdrawn. Other objects will hereinafter appear.

One form which our invention may assume is exemplified in. the following description and illustrated in the accompanying drawings, in which- Fig. 1 is Fig. 2 is a side elevation partly in section.

Fig. 3 is a cross section on line 3-3, Fig. 1. r v

4 is a sectional view of a tank show es Referring to the drawings in detail, and particularly to F gs, 1, 2 and 3, A indicates resent invention is to a front view of the machine.

in general a casting, which consists of a base section B, an intermediate section C, and an upper section D. These sections are formed integral with relation to each other as they are produced in a sin le casting and they serve two functions: that of -a support for an electric motor ofsuitable construction, such as indicated at 2, and secondly that of a journal member and support for a shaft 3 and an impeller 4, which is secured thereon. Therelectric motor may be secured on the upper end of the housing in any suitable manner and it is preferably enclosed when in position by means of an exterior cap 5, whlch is secured by means of screws or the like, as indicated at 6, thereby forniing a substantially water-tight joint between the casting and the cap. The intermediate portion G is cored out toform a water circulating chamber 7. The shaft 3.

extends vertically through this chamber and is positioned substantially centrally therewith. The upper end of the chamber is curved and directed forwardly as indicated at 8, and it terminates in a nozzle 9, which is elongated and substantially rectangular in shape. (See particularly Fig. 1). That is the upperend of the circulating chamber 7 terminates in a nozzle opening 10, which has the rectangular shape referred to, and this discharge opening is deflected .in a downward direction ,as. indicated by the arrow 11 t0 direct the water into and between the dishes disposed in a basket indicated at 12. The lower end of .the water circulating chamber terminates in the base portion B, which is provided with a series of radially disposed openings 13 through which, the inlet water is admitted when the machine is in operation. These numerous openings pro- 0 vide a liberal area for the incoming water and iltl thusdenters with] th; least resistance possi e,sa1 openmgsa so orminga uligthtg, guard against the admission 0 dish c 0 etc.

The baseportion is rovided with a substantially flat face, as own at 14, a pair of inwardl curved side sections 15 and 16, and a s ort back or rearsection 17, which is parallel with the front section 14. This particular arrangement of the front, side and rear sections is of some importance as it often happens that tanks are equipped with waste pipes extending a cons: av

ate-.

tered in the rear ofthe smaller tanks with out interfering with the connections or fittings referred to. I

The shaft 3 is coupled in any suitable manner'as indicated at 18 to the motor-shaft and it is held in its vertical position by means of a pair of bearings such as shown at 19 and 20. These bearings are preferably of the self-lubricating type as they remain in a submerged'condition' when the machine is in operation. A thrust collaiis also employed, as shown at 21, to relieve the motor of any thrust which the impeller 4 creates when in operation. The main casting A is cored out above the circulating chamber 7 to form a chamber 22. An opening 23 is formed in the rear side of the casting to permit access to the chamber,

for instance to adjust or inspect the thrust downward collar and the coupling 18 or otherwise. A removable hand plate 24 is, however, employed by which the chamber is normally closed and drain openings are formed in the lower part of the chamber or in the hand hgle plate to vpermit free escape of any water which may enter through the bearing 19.

In actual operation the machine is placed in one end of the tank as shown in Fig. 4. Water containing soap or other washing ingredients, is then. admitted to the tank until the a proximate level indicated is obtained. wire basket containing the dishesto be washedxis then placed in the tank and in front of the discharge nozzle 9 in such a position that the discharging fan shaped stream of water will be effectively directed downward and through the basket and between the dishes. The current set up by the fan-shaped stream after passing and through the dishes is deflected along the bottom of the tank to the opposite end of the tank and then upwardly and back through the dishes and alon the surface, one feature of this action eing that part of the return current skims the surface of su'ds and refuse. This is of great importance as such matter. would otherwise adhere tothe surface of the dishes when the basket is removed.

The washing ofithe dishes only requiresa few seconds and it is then desirable that they should be rinsed and vscaldecl. The

basket with the dishes is therefore placed in the scalding tank. The water is here mamtained at practically a boiling temperature and the dishes are therefore rapidly rinsed and sterilized and will dry by themselves when basket is removed. a

' that the mechanism emplo The gigeral construction and design of the mac e here illustrated are of considerable importance. First it should be noted ed is extremely simple as only three working parts are required, to-wit, the motor, the shaft and the impeller carried thereby. Such simplicity of constructloneliminates the necessity of skilled operators, etc., and should therefore.

give satisfactory service with comparatively little attention and care. The motor may be attached to any standard lighting circuit by an extension or plug shown and as the casting employed holds the motor considerably above-the water overflow line, it can be seen that short-circuiting, etc., will be avoided. The machine as a whole is light'in weight and is-provided with handles suchas shown and can therefore be easily and readily grasped and movedfrom one tank to another whenever desired. Theshapeof the base portion permits the lower end to be entirel open and also serves as a liberal inlet to the circulating chamber 7 as numerous openings 1'3 may be formed in the front and sides thereof. The inward flare in the side sections 15 and 16 is also important as it reduces the amount of floor or bottom space required, particularly when drain fittings, etc., are encountered.

While certain features; lnventlon are more or less specifically illusof the present trated, we wish it understood that various changes in form and proportion may be resorted to within'the scope of the appended claims, similarly that the materials and finish of the several parts employed may be such as the experience and judgment of the manufacturer may dictate or various uses may demand, Having thus we claim and desire to secure by Patent is- Letters A dish washing machine of the character described ficomprising a vertically disposed casting, a base portion thereon, a water circulating chamber formed in the casting above the base portion, a plurality of gratelike inlet openings formed in the base portion and in communication with the lower end of the chamber, an elongated, downwardly directed, horizontally disposed, rectangular shaped discharge spout formed in the c'asting and in communication with the upper end of the chamber, an electric motor on the upper end of the casting, a housing enplosing the same, a vertically disposed shaft journalled in the casting and extending into the water circulating chamber, said shaft being directly connected with the motor, and an impeller secured on the shaft and also disposed in the water circulatin chamber.

RY F. OAVANAUGH. THEODORE ,S. HALL EDWIN S. r VER.

1 described our invention, what 7

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