DE1977908U - DISHWASHER. - Google Patents

Description

Dr. Hans-Heinrich Willrath Dr. Dieter Weber

PATENT LAWYERS

Telegram address! WILLPATENT Postal check: Frankfurt / Main 6763 Bank: Dresdner Bank AG. Wiesbaden

Account No. 876 807

\ .n. uut ^ * - ^ ₂ Wiesbaden, 29 Nov 1967 ^ -

IIl / co

Hildastrasse 18

P.O. Box 1327

Telephone (06121) 37 27 20

H 51 255/34-c Gbm

The Hobart Manufacturing Go.

The Hobart Manufacturing Company, 711 Pennsylvania Avenue, Troy, Ohio (USA)

dishwasher

Priority; Ser. STo. 346,261 dated February 20, 1964 in the United States

The hiring relates to a dishwasher with a washing chamber, a sump for this chamber, a motor-driven pump, a spray and pumping device, fill and drain valves and a control device for the valves and the

Pump.

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The fire is particularly useful in connection with dishwashers with a relatively low capacity, such as those found in small restaurants, small cakes, such as, for. B. in rest houses or diet kitchens, or in beverage stands, bars, snack bars and the like. Can be used. Such machines operate on a relatively short time cycle, and the final irish water rinse of soiled plates or other objects must be sufficient to kill bacteria that may be present on these objects. In many cases, this is ensured by a fresh water flush with a tap at a temperature of about 82 ⁰ O (180 ° F) or higher, and most local and state health and sanitary codes

contain certain provisions in this regard.

However, there are a number of circumstances in which, as a result of the limited capability of the existing hot water heating system, such a source of fresh water at a higher temperature is not easily accessible, and in such cases it has heretofore been customary to use a so-called auxiliary heater to be provided which has either an electric heating element or a gas burner heating device, and in addition to the dishwasher is provided. But this was inevitably a rather expensive accessory to the dishwasher, and other precautions are therefore desirable to ensure a bactericidal final contamination in such machines.

The innovation is based on the task of creating a machine for washing dirty plates and the like., With which allows a bactericidal final rinse of the objects to be cleaned without an auxiliary heating device. Here

should in the machine at least the final rinse water that is used in the individual operations of the dishwasher a predetermined amount of a disinfectant will be added, and this machine is said to be cheap and convenient attachable accessories for a dishwasher of the usual construction. In the machine according to the invention it should be possible to use a commercially available disinfectant liquid, and this should have sufficient hypochlorite as an active ingredient to ensure that the rinse fluid has a sufficient number of parts per million of bleaching acid contains so that it can effectively act as a bactericide.

According to the innovation, this task is solved by a storage

ti container for ·. Deginfectant liquid, an automatic metering device with an inlet which is connected to the storage container and has an outlet opening to the cleaning chamber, wherein the igniter has an elongated bottom portion which is connected to a metering chamber below the inlet, one arranged below the metering chamber.

Outlet chamber one: to the side of the outlet chamber in free communication with the cleaning chamber of the machine:

passage opening, a valve seat at the lower end of the metering chamber

above the exit opening, a first, closed in the idle state Valve between the metering chamber and the outlet chamber with

a membrane above the bottom of the outlet chamber to which membrane the first valve is attached, a second, normally open valve between the inlet and the metering chamber in operative unit with the first valve, wherein the actuating device has a solenoid on the side of the membrane facing away from the first valve, through which the valves simultaneously closing the inlet and opening the metering chamber to the outlet chamber can be actuated.

The hiring is in the following with reference to the drawing, for example explained; it shows:

Pig. 1 shows a perspective view of a dishwasher with a device according to the haying;

Pig. 2 is a side view of the in Pig. 1 shown Machine, with individual parts shown crawled away to the overall arrangement of the spray system to make it visible;

Pig. 3 the essential elements in a somewhat schematic form an accessory according to the innovation for introducing the disinfectant into the machine;

Fig. 4 shows in detail the construction of one in the in Pig. 3 shown device usable, suitable metering valve and

Pig. 5 is a schematic circuit diagram.

In the drawing, which shows a preferred embodiment of the hay, Pig. 1 the typical execution of a Dishwasher to which the inflation relates. This machine has a housing 10 in which there is a washing chamber 12, and at the front of this housing and chamber there is a door 14 which is pivotable at its lower edge

is mounted to make the interior of the chamber 12 accessible.

This door "also forms a support in its open position for the racks 15? which hold the objects to be cleaned in the chamber 12.

As shown in Fig. 2, the chamber 12 has on its underside a sump 17, and below this sump is a motor-pump unit 18, the liquid from the The sump of the rotating spray device, namely the wash arm 20, feeds. The construction of this motor-pump unit and the

Wash arms can be, for example, as described in US Pat. No. 2,862,510 and this recirculation system a filter or sieve device can also be used (not here

as shown in the aforementioned USA patent is described.

The disinfectant material is preferably liquid, as follows described, and the supply takes place from a torrent bottle 25, which is from a bracket attached to the housing 10 26 is worn. This bracket usually has one

vertically extending slot 27 to the liquid level to be able to see in the reservoir 25. Its feed line 29 runs from the bottom of this storage container through a corresponding opening in the wall of the housing 10 and along the wall 12a of the chamber 12 to one automatically operated metering device 30. The details

this device are shown in FIG.

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The body 31 of this device is carried by a bracket 32 fixed to the wall 12a "and in the middle Part of this body 31 "is a metering chamber 35, which

formed by the space between the partition walls 36 and 37 will. The opening 39 in the partition wall 36 leads from the chamber 35 to an outlet chamber 4-0, which in turn with the

Outlet 42 of the entire device 30 is connected, and this outlet is connected to the interior of the chamber 12. A

Valve body 44 is carried by a flexible membrane 45 ', preferably as an integral part thereof, and the outer edge this membrane is clamped tightly in the body 31 in a sealing manner by means of a bearing plate 46. line operating rod 50 runs through the center of the y-valve 44, and on the back of that valve is an enlarged flange-like one Part 51, which presses against the valve 44, on the other hand a leather 52 rests, which strives to the valve 44 to hold in the illustrated closed position. The rod 50 extends through the chamber 35 and through an opening 53 in FIG the partition 37 to the inlet chamber 55 of the metering device.

On this part of the rod 50 is a secondary valve in the form a flexible valve head 58 is attached, and this secondary valve is normally open as shown and permitted then a connection between the line 28 and the chamber 35.

The opposite end of the rod 50 is on the fitting part 60 of the actuation solenoid attached, and this armature

extends into the support line 61, around which the

Solenoid coil 62 is attached. The line 61 represents also represents the storage for the spring contact cap 64. Preferably, a cover 65 encloses the entire solenoid assembly

order which; is attached to the plate 46. The terminals 66 extend from the end of the cap 65 and serve to connect the solenoid coil to an actuation circuit.

The operation of the device can be seen from the drawing. When the solenoid is switched on, it pulls its armature and thus the rod 50 in the direction of view according to FIG. 1 left, whereby the valve 44 is opened and the valve 58 is closed. This allows the contents of the metering chamber 55 j through the outlet chamber 40 and the outlet into the cleaning chamber 12 of the dishwasher to drain. When the solenoid is turned off, the parts will return to the position shown

back, and the chamber 35 is again due to gravity filled up from the storage container 25.

The operation of the machine will now be described with reference to FIG. The manual push button switch 70 serves as the main control element for the electrical energy supply. This switch is preferably on the machine itself arranged, for example in the manner shown in FIG. It can be of the SPLET type; H. so such a switch, which optionally remains in one of two positions, and the

then connects the feed line L2 to one or the other of the contacts 70a and 70b.

Each of the lines emanating from these contacts can therefore close a feed circuit to the time control unit 75, the five cam operated switches 75a, 75b, 75c, 75d and 75e includes. The lure that actuates these timing switches are of the usual type and therefore not shown; however is

their G-esamtanordnung by the drive motor 76 of the Zeitsteue ^"1 inference means and the dashed line 77 indicated that

represent the cam control for these timing switches target. The timing switch 75a has two control contacts 75a-1 and 75a-2 that mate with push-button switch contacts 70a and 70b are connected. It should be emphasized that when this timing device comes to rest and turns off, it is on a corresponding contact to open the circuit from the switch 70 ago.

In order to start a working cycle of the machine, the switch 70 is brought to the contact on the system which

opposite to the contact on which it rests when the machine switches off, and there is a power supply via the

Switches 70 and 75a to the safety microswitch 78 are closed. This switch 78 is mounted in the machine in a conventional manner such that it is closed when the Door 14 of the machine is closed, but opened and breaks this circle when this door is opened. Assuming the door is closed, it is Power supplied by the timing motor 76 to the feed line 11 completed.

The timing switch 75b is across its contact 75b-1

so connected that he has the power supply to the Pump motor PM controls, which is the motor part of the pump-motor unit 18. This pump motor is supplied with power as long as as the above-mentioned main feed circuit is closed and the timing switch 75 b is closed.

In machines of this type, two separate fill valves are generally provided, identified in FIG. 5 as FV-1 and FV-2 are. The valve FV-1 connects a normal hot water supply (with e.g. 1. 60 ° G) with the washing chamber of the machine, and This valve is opened when the machine is filled with this lower temperature barrel during the washing process shall be. The timing switch 75c controls the supply of current to the solenoid of the valve FY-1 through the Switch contact 75c-1 · One separated therefrom by a solenoid actuated Yentil FV-2 establishes the connection to a water supply at a higher temperature, e.g. B. 82 ° G. If such a hot water supply is available, the supply takes place this hot water into the rinsing chamber via the Yentil W-2 during the rinse cycle. If the machine is equipped with a disinfection device in accordance with the rate of inflation, where are the

Inlets of valves FY-1 and IY-2 with the same low temperature water supply connected and the hot water supply is on

then not required. The timing switch 75d controls the electrical power supplied through its contact 75d-1

to the solenoid of valve FV-2 and to solenoid 62 of the

Ar-

Disinfectant metering device 30. The time control switch 75e controls through its contact 75e-1 the electrical current supply to the solenoid of the drain valve DV, which the ATD flow line of the sump 17- opens and closes.

The operation of the machine is such that when a work cycle is started by pressing switch 70,

and when the door of the machine is closed, the filling valve FV by closing the timer switch 75c for about Seconds while the switch 75e is closed so that the drain valve DV is also turned on and thus is closed; in addition, the switch 75b is closed so that the pump motor is turned on. if when the sump fills with water, the pump begins to work and to pump this water for the washing process by pumping the water into the spray head from which it is is sprayed over the items to be washed and then again

returns to the swamp to then be pumped over again.

At the end of the 30 second period, the sump is sufficient filled (in a typical machine of the one affected here This kind of requires about 9 liters), and the filling valve is switched off while the pump motor is during a predetermined Time period continues.

At the end of this period, switch 75b opens and turns off the pump motor, and switch 75e also opens, see above

that the drain valve is switched off and thus opened, so that now the wash water can drain from the sump. Then all timers 75b, 75c, 75d and 75e closed. As a result, the sump fills with fresh water, and the pump motor is switched on again, and at the same time causes the metering device 30 that a predetermined Amount of disinfectant is introduced into the washing chamber of the machine, so that it is flushed with the fresh rinse water mixed together, laugh about 30 seconds open the timer 75c and 75d so that the filling process is terminated while the pump motor is during the remainder of the flushing section

of the overall cycle continues. At the end of this part of the cycle then the switch 75b opens, and the switch 75e also opens, so that the drain valve is now switched off again and is opened so that the rinsing liquid can now drain off. The switch 75a switches to the contact that opposite the one on which it was previously in system, so that now the main power supply is opened and the machine is being prepared for the next work cycle.

A signal lamp 80 is connected in parallel to the main feed circuit to the drain valve and this signal lamp is on the Attached to the front of the machine and indicates to the operator that a work cycle has started. The Mifcro-

sehalter 78 can cut off power to the timing motor and to each of the timing switches 75b, 75c and 75d while $. but he has no influence on the time

control switch 75e has. So if the operator does If the door of the machine and thus the switch 78 were to open during a work cycle, the control circuit of the Drain valve is not impaired, and there would then be no accidental and unintentional loss of flushing liquid in enter the machine.

The disinfectant material used in these operations is, by definition, a particular class of bactericides, the

particularly used in food related facilities, including dishwashers and the like.

Typical of such disinfectants are hypochlorites, chloramines and other organic compounds that release chlorine, quaternary ammonium compounds, and certain "iodophores, like the chlorine-releasing compounds and the hypochlorites.

By using this special hypochlorite solution with a machine with a capacity of about 9 meters, as already mentioned mentioned above, creates an addition of about 12 cm of the disinfectant the required Öhlor PPM number for the final flushing water filling. This way one effects one with a Dishwasher of the type described connected according to the invention Device for proper disinfection of items washed in this machine without the need to Use water at a particularly high temperature for the wash cycle.

This achieves several advantages. The machine can be operated with hot water, as it is available in buildings, namely with temperatures in the range of about 50 to 60 ° ö, in contrast to markedly hot water of at least over 80 ° G, which is otherwise required. In addition, working at these lower temperatures will tend to spot the items being cleaned considerably reduced as a result of air drying. In particular on glassware and drinking glasses according to the invention this reduction in leakage was observed.

Also, if the objects are air-dried after they have been removed from the chamber, the chlorine will evaporate and enter the air, and in such a temporal amount that it is neither harmful nor noticeable at all. To this

In this way, no odor remains on the washed items.

The disinfectant supply device, as it is in particular in Pig. 3 is shown, can not only in a new dishwasher but can also be added to existing machines as an additional unit. In such machine models where only a single filling valve is provided, this valve can be used in the same way as the / n lig. 5 valve FV-1 shown can be connected

and is then under the control of both the timing switch 75c as well as the timing switch

75d by connecting contacts 75c-1 and 75d-1 then through a connecting wire be connected to each other. With such a

Arrangement, the disinfectant metering device 30 always works when the only existing filling valve is switched on is, and this then only means that a predetermined amount of disinfectant both the washing liquid as is also added to the rinsing liquid. In this case, the device needs a little more disinfectant in operation, however, this material is generally cheap enough to make this acceptable too.

Claims (1)

ü? he Hobart Manufacturing Go , Claim to protection Dishwasher with a washing chamber, a sump for this chamber, a motor-driven pump, a spray and pumping device, fill and drain valves and one Control device for the pump and the valves, characterized by a storage container (25) for disinfecting liquid, an automatic one. Metering device (30) with an inlet (55) which is connected to the storage container (25) and an outlet opening (42) to the cleaning chamber (12) comprises, wherein the metering device (30) has an elongated Has bottom portion which is connected to a metering chamber (35) below the inlet (55), one below the metering chamber (35) arranged outlet (40), one to the side of the outlet chamber (40) in free communication with the cleaning chamber (12) located on the machine. . Exit opening (42), a Valve seat (44) at the lower end of the metering chamber (35) above the outlet opening (42), a first., Closed in the idle state Valve (44) between the metering chamber (35) and the outlet chamber (40) with a membrane (45) above the bottom of the outlet chamber, to which membrane the first valve (44) is attached. second normally open valve (58) between the inlet (55) and the metering chamber (55) in unity with the first valve (44), the actuating device on the the side of the membrane (55) facing away from the first valve (44) Has solenoid (62) through which the valves (44, 58) at the same time closing the inlet (55) and opening the metering chamber (35) to the outlet chamber (40) can be actuated.