US2304438A - Dishwashing machine - Google Patents

Description

Original Filed Feb. 14, 1940 4 Sheets-Sheet l.

Inventor Dec. 8, 1942. 1-. E. D. BILDE- DISH WASHING M ACHINE Original Filed Feb. 14, 1949 4 Sheets-Shee t 2 Ingenifio r Dec. 8, 1942. T. E. 0.5m: 2,304,438

\ DISH WASHING MACHINE Original Filed Feb. 14, 1940 4 Sheets-Sheet s m me Dec. 8, i 42 DISHWASHING MACHINE Tord Erik Daniel Bilde, Ulvsunda, Swedemassignor'to Bolinders Fabriks Aktlebola'g, a corporation of Sweden liolm, Sweden,

Stock- Original application February 14, 1940, Serial No.

ary 28, 1941, Serial No.

March 3, 1939 6 Claims.

This application is a division of my copending patent application. Ser. No. 318,929, filed Feb- Divided and this application Febru- 381,1'l9. In Sweden (or. 141-9) f ruary 14, 1940, now Patent No. 2,270,695, granted January 20, 1942, and, as to all subject matter,

relates back to said application Ser. No. 318,929, and to foreign applications corresponding thereto for all dates and rights incident to the filing thereof.

The present invention relates to dish washing machines having a pump for washing liquid, a pump for rinsing liquid, an electric motor for driving said pumps, and an electric heater for heating at least one of said liquids.

The principal object of the invention is to provide a dish washing machine of the type described having a common switch for the control of the motor and the heater and common control means for. said switch and liquid flow control valves permitting an economical and safe operation of the machine.

Further objects of the invention will be apeither side of said' motor. A suction pipe 25 from pump 23 is connected to an opening provided in the bottom of washing tank 2|] and controlled by a lift valve 26, the valve spindle 21 of which passes through suction pipe 25. Suction 28, lift valve 29 and valve spindle 39 for in similar manner in relation to rinsing ,tank 2|. Connected to the lowermost point' of pump 23 is a discharge pipe 3| controlled by a valve not shown, the'valve spindle 32 of which also passes through the wall of discharge pipe 3|. 33 is an overflow pipe from washing tank 20.

35 washing pump 23 p p pump 24 are arranged By means of a rising pipe is connected with'a spraying device for washing liquid illustrated as comprising a spraypipe 36 swingable horizontally to and fro in the lower portion of spraying space H. A similar rising pipe 31 connects rinsin pump 24 with aspraying,

parent :according as the following description proceeds, reference being had to the accompanying drawings showing my way of example an em-' bodiment of the invention.

In the drawings: Fig. 1 is a lateral view of the machine partly in section;' I

' Fig. 2 is a front section; I

Fig. 3 is a longitudinal sectional view of the control box on an enlarged scale; I

Figs. 4, 5 and 6 show the switch in different positions of setting as seen from the right in 3, i c Fig. "1 illustrates a thermostat and the connection thereof with the switch; and

Fig. 8 is a wire diagram.

The general structure of the machine is apparent from Figs. 1 and 2.

I. designates a casing built into a washing table II and resting with an upper flange |2 on a shoulder |4 formed'around an opening in the table-top. Atits top the casing I is closed by a cover It connected to the casing by hinges l and inits closed position lying in flush with the surface of the table-top. The casing forms a spraying space II for the dishes and is at its bottom formed to provide a container which'by oblique walls |8, I9 is divided into two co p rtments, the one for washing liquid and the other 2| for rinsing liquid. Provided below the spraying space- H and behind the liquid container 2|, 2| is a motor pump unit consisting of an electric motor 22 .and'pumps '23, 24 arranged on view thereof also partly in' adjusting member device for rinsing liquid comprising a stationary spray pipe 38 disposed in the lower portion of the spraying space.

40 designates a control box which according to the invention encloses all electric members of the machine and is secured to the underside of the motor 22. As will be more fully described in the following, a switch enclosed in the box controls, on the one hand, the motor, on the other hand, an electric heating device 4| provided within rinsing tank 2|, the vice passing into the box through a tube 43. 44 designates the leading-in cable.

Secured to a shaft 45 rotatably mounted in the wall of box 40 and carrying within same an manner to be described in the following is a double-armed lever or balance beam 46 disposed immediately below the spindles 21, 30 of valves 26, 29 and connected with each ofsaid spindles by links "and 48, respectively, a pin 49 and 50, respectively, on beam 46 engaging an elongated I slot 5| and 5|a, respectively in the links. The

arrangement is such that ineach end position of balance beam 46 the one valve is closed and the other open. At its ends a wire 52 issecured to the ends of the beam 46 and passes over. idiercilers 53 to an instrument panel 54 disposed on the front wall of the casing and accessible through shaft 55a of which carries an an opening in a door Ila in the washing table. Thisinstrument panel 54 carries a handle the arm 54 at the free end of which the wire 52 is secured. When handle 55 is turned in one direction or other, valves 26, 29 .are opened and closed 'alternatingly.

Another handle 31 arranged on instrument wires 42 of said de- 4 controlling the switch in a e each rocker.

, hollow shaft 83 mounted 82 journalled on a pin 85 fixed to shaft 45. Shaft vpin 99 (Figure 3). ries afollower arm 9| forming a mechanical adpanel 54 carries on its shaft 51a an arm 58 which by means of a wire 59 passing over an idle roller 64 is connected with a bell crank lever 69 controlling the spindle 32 of discharge valve of the washing pump 23 which valve by a spring 6| is urged towards closed position. Fixed to the same shaft'51a within machine casing I9 is an upwardly projecting arm 62 bearing with a roller 63 on the underside of cover I6 and serving to lift said cover through a small angle so that it can be grasped by hand.

As will be more fully described in the following, the switch is also=actuated by a thermostat comprising a bimetallic member 65 disposed close by the bottom of rinsing tank 2I and actuating a shaft 66 which passes through the wall of box 49 and within said box carries: an adjusting member actuating the switch. At its free end shaft 66 carries a hand-wheel 61 accessible through an opening in door Ila.

As shown in Fig. 3, control box 49 is by means of screws .10 secured to the underside of motor frame 22. The box has an elongated shape and contains at its one end a terminal block 1| for the motor and at its other end a switch designated as a whole by 12. In the embodiment shown the switch consists of a double pole twoway rocking switch comprising two mercury rockers 13, 14 having each two pairs of contacts which are connected with the source of current, the motor and the heater in a manner illustrated in the wire diagram in Fig, 8,

According to this diagram each of the leading-in wires 44 is connected with the inner contacts 13b, 13c and 14b, 140 of the contact pairs of rockers 13 and 14, respectively, whereas the motor -22 by wires 15 is connected with the outer contacts 13a, 14a of one contact pair of each rocker and the heater by wires 42 with the outer contacts 13d, 14d of the other contact pair of Thus, the motor and the heater 4| are coupled in parallel to the switch which has two contact positions and an intermediate currentless position, each of motor and heater being switched-in in one of said contact positions.

The two mercury rockers 13, 14 are secured to a common support or frame 89 having lateral plates 9| and 82, plate 8| being secured .to a in the box and plate 63 is actuated by a spring 84 tending to turn frame 89 together with mercury rockers 13, 14 in counter-clockwise direction as seen from the movement being limited by the engagement of a pin 98 on frame plate 82 with rocking lever 94 locked by arm 9|.

In Figs. 4 to 6'va1ve balance beam 46 is indicated by the chain-dotted line 46a.

In the position of the switch shown in Fig, 4 rinsing valve 29 is open and washing valve 26 closed. The motor is switched-in, that is the machine is set for rinsing. In this position roller 92 engages right-hand notch 95 in the rocking lever 94 and the switch assumes its right-hand end position. When the machine is to be shifted to washing, handle is turned in clockwise direction as seen in Fig. 2 causing balance beam 46 and thereby follower arm 9| to be turned in counter-clockwise direction in Fig. 4. Thereby rocking lever 94 and, thus, frame89 are released, the latter being turned in counter-clockwise direction under the action of spring 84 bringing with it rocking lever 94 in the same direction by pin 99. Thereby the circuit of the motor is opened. When balance beam 46 assumeshorizontal position (see Fig. 5) follower arm 9| has been turned through such an angle that its roller .92 engages the middle notch 96 of rocking lever 94 locking said lever in this position, in which rocking lever 94 by the engagement of pin 99 locks the switch in the left-hand end position in which the circuit of the heater is closed. .011

continued turning of balance beam 46 follower arm 9| is turned through a further angle in counter-clockwise direction, causing its roller 92 to turn rocking lever 94 in clockwise direction, until roller 92 engages the left-hand notch 91 of rocking lever 94 (see Fig. 6) which in turn by means of pin 98 returns the switch to the right-hand end position in which the circuit of the motor is again closed. Now the machine is set for washmg.

on the turning of balance beam 46 rinsing valve 29 can fall down due to its own'weight but washing valve'26 remains first unactuated on right in Fig. 3. The leading-in cable 44 is introduced into the box 49 through the cable fairlead 86 and cable terminal 81, and the motor wirings 44, 15 to and from the switch pass through the hollow shaft 83. On account of the relatively great distance between the switch and the terminal block 1| any 'risk of fracture of the wires is. eliminated,

As mentioned above, valve balance beam 46 is secured to; shaft 45, for instance by means of a Within box 49 the shaft carjusting member for the switch. At its free end provided with three ferentpositions. As stated above. frame 89 to- I "gether with mercuryrockers13, 14 are actuated by spring 94 shown in Fig. 3 in counter-clockwise direction. as'seen ii -Figs. 4 to' 'l, saidv turning wall eccentrically to account of pin 49 sliding in slot 5| in link 41. First near the end of the turning movement of beam 46, before the motor is again switched-in, pin 49 strikes the upper end of slot 5| thereby lifting valve 26. Thus, the pin and slot connection 49,*5|, and 59, 5Ia, respectively, permits a certain lost motion of balance beam 46 during which the switch opens the circuit of the motor.

In the embodiment shown the switch is, as mentioned above, arranged to be actuated not,

only by valve balance beam 46 but also by thermostat 65 disposed close by the bottom of rinsing tank 2| near heater 4| (see Fig.3). Securedto the lower shank of bimetallic member 65 (see also Fig. 7) is a plate I9| having an angular notch I92. Engaging said notch by its preferably rounded-off end is a rod I93 which passes eccentrically through a disc I94 fixed to shaft 66 and which may 'be lockedby means of a screw I95. Thereby the length of the portion of rod I93 lying outside the disc may be varied and, thus, also the temperature at which the thermostat "re- 65 sponds.

Within box 49 shaft 66 or its extension carries an arm I96 which forms another adjusting member for the switch in the form ofa movable abut-- ment. Arm I96 cooperates with an abutment I91 on frame 89. A spring I98 of a strength greater than that of a spring 84 tendsto turn shaft 66 and thereby arm I96 in counter-clockwisedirection in Fig. 7, abutments I99, II9 provided on the box wall-limiting the turning of arm I96.

Inthe above explanation of the operation of which the thermostat responds.

' by dotted lines.

the switch on the adjustment thereof by means of handle 55 and balance beam 46 it is assumed that the thermostat is switched-in as shown by full lines in Fig. 7 but that the temperature in the rinsing tank is below that temperature at When this temperature is attained the lower shank of the bimetallic member 65 releases rod Hi3 causingshaft 86 to be turned in counterclockwise direction in Fig. 7 under the action of spring I08, arm I06 being thereby moved from the position shown in this figure by full lines into the position shown I06 the switch will on adjustment be stopped in a middle position in which it is currentless.

Thus, the switch cannot be turned into its left end position in which the heater is switched-in. The thermostat may also be switched in and out manuallyby actuating the handle 61.

When the thermostat is switched-in but the temperature is too lowthe switch will, consequently, on the adjustment of valves 26, 29 from washing into rinsing position and vice versa transiently switch in the heater, when balance beam 46 assumes horizontal position, but if the thermostat is switched-out either manually by han In this new position of arm dle 61 or automatically under the action of the temperature in rinsing tank, the switch will on the adjustment of the valves be transiently stopped in currentless position (dotted lines in Fig.

'1) arm I06 thereby preventing the switch from assuming the position of Fig. 5 because the spring 84.

What Iclaim is:

1. In a dish washing machine, two pumps for forwarding a washing liquid and a rinsing liquid, respectively, an electric motorfor driving said pumps, an electric heater for heating at least one of the liquids, a two-way rocking switch having two current carrying positions and a currentless position, electric means to connect the motor and the heater with the switch in such strength of spring Ilil'is greater than that of ill manner as to'cause the circuit of said motor to be closed in one of said current carrying positions and the circuit of said heater to be closed in the other one of said current carrying positions, a flow control valve for each of the liquids, means to control said valves, said control means being rockable in accordance with the rocking motion of the switch, means,to' connect said control means with the switch, and means manually to operate said control means.

2. In a dish washing machine, two pumps for forwarding a washing liquid and a rinsing liquid, 7:

respectively, an electric motor for driving. said pumps, an electric heater for heating atleast one of the liquids, a two-wayrocking switch having two current carrying positions and a currentless position, electric means to connect the motor and the heater with the switch in such manner as to cause the circuit of ,said motor to be closed in one of said current carrying positions and the circuit of said heater to be closed in the other one of said current carrying positions, a flow control valve for each of the liquids, a rocking shaft, a support carrying the switch and mounted on said shaft, another shaft coaxial with the first-mentioned shaft, means for operatively connecting said shafts, a rocking beam fixed to said last-mentioned shaft, and means to connect said beam withthe. valves so as to cause said valves to be opened and closed altematingly.

3. In a dish washing machine, two pumps for forwarding a washing liquid and a rinsing liquid,

' rentlessposition, means electrically to connect.

respectively, an electric motor for driving said pumps, an electric heater for heating at least one of the liquids, a two-way rocking switch having two current carrying positions and a currentless position, electric means to connect the motor and the heater with the switch in such manner as to causethe circuit of said motor to be closed in one of said current carrying positions and the circuit of said heater to be closed in the other one of said current carrying positions, a flow control valve for each of the liquids, a rocking shaft, a support carrying the switch and mounted on said shaft, another shaft co-axial with said firstmentioned shaft, a rocking beam and a follower secured to said last-mentioned shaft, means to connect said rocking beam to said valves, a rocking lever mounted eccentrically to said last-mentioned shaft and operative by said follower, said rocking lever being formed to provide limiting abutments for the rocking motion of the switch carrying support so as to cause. the circuit of the motor to be closed in both end positions of said rocking beam and to be opened inan intermediate position thereof in which the heater is ner as to cause the circuit of said motor tobe closed in one current carryingposition oi the switch and the circuit of said heater to be closed in the other one of said current carrying positions, a separate valve for the control of the flow of each of said liquids, a rocking beam, means to connect said rocking beam with the valves so as to cause said valves to be opened and closed altematingly, manual means to operate said rocking beam, means to connect said rocking beam with the switch, and means to prevent the switch from assuming the current carrying position in which the circuit of the heater is closed.

6. In a dish washing machine, two pumps for forwarding a washing liquid and a rinsing liquid,

respectively, an electric motor for driving said pumps, an electric heater for heating at least one of said liquids, a two-way rocking switch having two current carrying positions and a curthe motor and the heater with said switch in such manner as to cause the circuit ofsgd motor to be closed in one of the current carry g positions of the switch and the circuit of said heater to be closed in the other one of said current carrying positions, a separate valve for the control of the flow 'of each of .said liquids, a rocking shaft, a

' spring-actuated support carrying theswitch and mounted on said shaft, another shaft co-axial with said first-mentioned shaft, a rocking beam and a follower secured to said last-mentioned shaft, means to connect said rocking beam with the valves so as to cause said valves to be opened and closed alternatingly, manual means to operate said-rocking beam, a rocking lever mounted eccentrically to said last-mentioned shaft and operative on actuation by said follower, said rocking lever being formed to provide limiting abutments for the rocking motions of said switch carrying support so as to cause the circuit of the motor to be closed in both end positions of said rocking beam and to be opened in an intermediate position thereof in which the circuit of the heater is closed, an abutment movable into a position to lock the switch carrying support, whereby to prevent the switch from assuming the current carrying position in which the circuit of the heater is closed, a manipulating member for manually moving said movable abutment into said locking position, and a thermostat responsive to the temperature of the heated liquid or liquids for automatically moving said abutment into said locking position.

TORD ERIK DANIEL BILDE.

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