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Патент USA US3072144

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Jan. 8, 1963
D. A. JAMES
3,072,128
CONTINUOUS FLOW DISHWASHER AND STEAMER
Filed Jan. 30, 1961
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DUANE- A. JAMEC
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ATTORNEYS
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Ja,n. '8, 1963
D- A. JAMES
3,072,128
commuous FLOW DISHWASHER AND STEAMER
Filed Jan. 30. 1961
4 Sheets-Sheet 2
_
INVEN TOR.
DUANE A. JAMES
‘_
BY
704% MW
A TTORNEVS‘
Jan. 8, 1963
D. A. JAMES
3,072,128
CONTINUOUS FLOW DISHWASHER AND STEAMER
Filed Jan. 30, 1961
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INVENTOIL
DUANE A. JAMES‘
M MW
Jan. 8, 1963
D. A. JAMES
3,072,128
CONTINUOUS FLOW DISHWASHER AND STEAMER
Filed Jan. 50; 1961
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United States Patent
3,072,128
Patented Jan. 8, 1963
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FIG. 5 is a diagrammatic view illustrating the electrical
circuits and devices in the apparatus.
FIG. ‘6 is an enlarged longitudinal sectional view
3,072,128
CONTINUOUS FLOW DISHWASHER
AND STEAMER
Duane A. James, Richardson, Tex., assignor, by mesne
through the steam generating apparatus.
FIG. 7 is a bottom view of the steam generating ap
assignments, to Ling-Temco-Vought, Inc., Dallas, Tex.,
paratus and heater switch in circuit-making position with
portions of the receptacle broken away to show the heater
therein.
a corporation of Delaware
Filed Jan. 30, 1961, Ser. No. 85,558
10 Claims. (Cl. 134--57)
~
FIG. 8 is a bottom view of the steam generating ap
This invention relates to apparatus for washing articles, 10 paratus with the heater switch in circuit-interrupting po
and more particularly to apparatus for washing dishes
sition.
and the like and applying steam thereto.
Referring more in detail to the drawings:
The principal objects of the present invention are to
1 designates apparatus for washing articles such as
provide improved apparatus of this class including a cas
dishes and the like and consists of a casing 2 having a
ing having a washing compartment in which articles to 15 receptacle 3 de?ning a washing compartment 4-. The
be washed are supported and washing liquid directed
receptacle portion of the casing has end walls 5 and 6
thereon in a washing operation where-in water is delivered
connected by a bottom wall 7, rear wall 8 and top wall
9 to form a watertight tank having an access opening
10 normally closed by a door Ill. The bottom wall 7
and delivered to the compartment whereby the steam ~20 extends forwardly and downwardly from the lower por
condenses on the articles forming a distilled water
tion 12 of the rear wall 8 to a line 13 and then forwardly
rinse and heats the dishes for rapid air drying on com
and slightly upwardly to a line 14 from which the up
' pletion of the steaming cycle; to provide such a struc
ward inclination is increased to the forward portion of
ture including a steam generating apparatus through which
the casing where said bottom terminates in an upstanding
water ?ows to the washing compartment with the steam 25 wall portion 15 having an inturned ?ange 16 on its upper
to the washing compartment for a predetermined period
and is then drained therefrom and steam is then generated
generating apparatus having a receptacle with walls of
edge de?ning the lower edge of the opening 10. This
a different thermal expansion and contraction than scale
from the water whereby when all of the water in the
arrangement of the bottom forms a sump 17 in the lower
portion of said bottom. A drain pipe 18 communicates
receptacle is generated into steam and the receptacle is
cooled any scale deposit will crack and separate from the
walls of the receptacle and ?ow to the washing compart
the washing compartment at the sump thereof with a
suitable disposal, for example, a sewer or the like, by
either gravity flow or by a pump (not shown). The drain
ment with the ?ow of water on initiation of the next
pipe extends upwardly into the bottom wall and has
washing cycle; to provide such an apparatus wherein the
an open upper end 19‘ de?ning an over?ow pipe of suit
able height for the maximum desired level of washing
?ow from a hot water supply is continuous for the wash
ing cycle and the washing compartment has a drain with 35 liquid in the washing compartment, the open end 19 of
the drain .pipe being at a level below the lower edge of
of draining less than the input flow and a large drain
the door opening 10. , The drain pipe 18 also has a low
aperture at a maximum liquid level to maintain the liquid
flow rate opening or ori?ce 20 providing restricted flow
level in the Washing compartment during the washing
from the washing compartment, said ori?ce being in the
operation and provide for draining of all liquid from the 40 drain pipe and communicating with the sump portion of
washing compartment during the generation of steam in
the washing compartment at the lowest point for sub.
the steam generating apparatus; to provide such an ap
stantially complete draining of washing liquid from the
paratus with an air space between aligned ?ow portions
washing compartment, the ori?ce20‘ being of such size
of the duct from the steaming apparatus to the washing
that ?ow therethrough is restricted to a rate substantially
compartment and vent openings between portions of the
lower than the input ‘flow rate of water or washing liquid
casing whereby ?ow of liquid or steam to the washing
to the washing compartment whereby continuous ?ow
compartment effects circulation of air and steam in the
through the ori?ce during introduction of. washing‘ liquid.
washing compartment; to provide such a structure with
will allow the washing liquid to accumulate to a level
electrical devices operating automatically in a predeter
50 de?ned by the open end 19 of the drain, and thereafter
a small drain aperture at the bottom providing a rate,
mined sequence to successfully complete the required op
during washing operations water introduction is continued
erations; to provide a switch mechanism responsive to
expansion and contraction of the steam generating re
ceptacle to prevent overheating; and to. provide improve
ments in dishwashing and steaming apparatus with simé
pli?erl construction and reduced cost of manufacture and
yet retain positive and e?icient operation.
and also is drained at the same rate through both the '7
ori?ce 20 and the open upper end of the drain pipe.
:
The , sump ‘17 extends longitudinally of the washing
‘ compartment or between the end walls 5 and 6, and a.
distributor :21 is located'in the washingcompartment and
extends longitudinally thereof to move water or washing
' Other objects andadvantages of this invention will
liquid from the sump and distribute, it in relatively high
become apparent from the following description taken
velocity streams or sprays onto article 22 such, as dishes‘
and the like to vbe washed, said articles or dishes being; ‘
are set forth by way of illustration and example certain 60 supported on suitable racks 2.3 movably supported in
in'gconnection with the accompanying drawings wherein
embodiments of this invention.
;
guide tracks 24 carried by the 'end walls 5 andv 6, the racks‘
supporting the articles above the distributor 21.‘ The
guide tracks 24 are preferably arranged whereby the‘
racks 23 may be pulled outwardly of the washing coma
FIG. 1 is a perspective view of dishwashing apparatus
embodying the features of the present invention; with
portions broken awayv to better illustrate the structure‘
thereof.
-
-
'
'1
FIG. 2 is a vertical sectional View through the dish
washing apparatus taken on the line 2—2, FIG. 1.
FIG. 3-is a partial horizontal sectional view through
65
partment through the opening 10,,
v
The door 11 has end walls 25,-top wall 26’ and ‘a bot- .
tom‘ wall 27 connected to form a frame with the forward
edges terminating in inturned ?anges 28 against which a
the dishwashing apparatus taken on the line 3-——3, FIG..2. '
forward wall 29 is removably held, ‘said forward’ wall .
:FIG. 4 is a fragmentary horizontal sectional view 70
preferably being transparent material such asglass orthe
through the dishwashing apparatus taken on the line 4-4, "
.
FIG. 2. ,
.
'
'
like to provide a view into the washing compartment.
The glass wall 29 is held in place by spring members 30 i
3
3,072,128
having portions 31 engaging the inner side edges of the
glass wall and end portions 32 engaging reinforcing mem
bers 33 spaced from the glass wall and preferably mounted
on the end walls of the door. The door 11 is preferably
hingedly mounted at its lower edge for outward swinging
movement which is limited whereby the door will swing
only to approximately a horizontal position. The swing
ing movement of the door is limited by a rod member 34
hingedly mounted as at 35 on the door and slidable in an
opening 36 in a bracket 37 at one end of the washing corn
partment, said rod having a stop member 38 on the end
thereof adapted to engage the bracket when the door is in
horizontal position. The edges of the top and end walls
of the door adjacent the casing extend into channel por
tions 39 at the top and sides of the door opening and en
gage resilient seal members 40 in said channels to make
a substantially watertight seal at the sides and top of the
door opening when the door is in closed position. The
bottom wall 27 of the door slopes downwardly and in
wardly relative to the door opening and has a portion 41
extending through the opening and terminating in an
angle-shaped portion 42 having a seal member 43 adapted
to engage a ?ange 44 of a resilient sheet 45 when the door
is in closed position, said
member 42 being spaced
door is in closed position
The ?at resilient sheet 45
seal portion 43 and the angle
from the ?ange 16 when the
to provide a vent opening 46.
is secured to the bottom wall
with a space 47 therebetween to form a vent passage, said
sheet extending upwardly and forwardly to resiliently en
gage the angle portion 42 of the door when the door is in
closed position, as illustrated in FIG. 2. When water is at
washing level the water closes the vent passage whereby
when the water is drained from the washing compartment
the vent is opened and vapors can pass therethrough.
The end walls 5 and 6 extend below the bottom wall 7
and have a lower edge 47' adapted to rest on a suitable
oscillation of the housing is such that the direction of the
stream of water from said housing is changed to traverse
the interior of the washing compartment adapted to have
articles to be washed therein.
A steam generator structure 73 is mounted in the cham
ber 54 and is preferably connected to a source of hot
water, as, for example, the usual hot water system of a
house, said connection being by a pipe 74 communicat
ing with the steam generator, with a valve 75 in the pipe
74 for controlling ?ow therethrough. Steam or water
from the steam generator 73 is delivered through a pipe
76 which has its discharge end 77 aligned with and spaced
from an inlet 78 of a duct 79 communicating with the
interior of the washing compartment to provide an air
_ brake in the washing compartment supply whereby no
liquid can be siphoned from said washing compartment
back into the water system of the house. A partition 80
is arranged in the chamber 54 between the walls 5 and
50 and extending from the forward wall 52 to an upright
wall 81 to cooperate with the top wall in de?ning an air
circulation or vent chamber 82 which has communica
tion with the exterior of the casing through vent open
ings 83 in the upper portion of the forward panel 52 and
with the interior of the washing compartment through an
opening 84. A de?ector plate 85 extends partially over
the opening 84 at an angle to the wall 5 to retard entry
of washing liquid into the vent chamber 82. It is prefer
able that the partition 80‘ be inclined toward the opening
84 whereby any condensation or liquid collecting in the
30 vent chamber will run back into the washing compart
ment.
The steam generator 73 is preferably in the form of
an elongated tank with end walls or members 86 and
87 connected by a shell 88 formed of metal having a high
coefficient of expansion such ‘as aluminum and the like
and of diiferent thermal expansion that scale that is de
support. The space below the bottom wall 7 is closed
posited from evaporating water. In the structure illus
at its forward portion by a forward wall 48. The casing
trated, the shell 88 is in the form of a cylindrical tube
2 has an extension 49 beyond the end wall 5 of the re
with the ends of the wall 89' thereof turned outwardly
ceptacle, said extension 49 having an end wall 50 spaced 40 to form ?anges 98 which are clamped in sealing engage
from the end wall 5 and connected to a rear wall 51 which
ment with suitable gaskets 9d of asbestos or the like
connects with the rear wall 8. The top wall 9 extends
which overlies the inner surfaces of the end walls 86
. over the extension and is connected to the end Wall 50‘.
The extension has a forward wall 52 between the end
wall 50 and the door opening 10 on which a timer and
control switch 53 is mounted. In the chamber 54 de?ned
by the extension an electric motor 55 is suitably mounted
and 87, the sealing engagement of _the ?anges 90 with
the gaskets 9‘1 and end ‘walls 86 and 87 being effected
45 by clamp rings 92 engaging the ?anges 90 and secured
to the end members 86 and 87 by suitable fastening de
vices such as screws 93 and nuts 94. The inlet pipe 74
and operatively connected with the impeller shaft 57 of
communicates with the interior or chamber 95 of the gen
the distributor 21 which is inserted into and keyed to
erator tank and the outlet pipe 76 communicates with
hollow motor shaft 56. The impeller shaft 57 has sub 50 said
chamber 95‘ at the upper portion thereof. In the
stantially oppositely extending vanes 58 with outer end
illustrated structure, the tank is arranged with the shell
portions 59 angled in the direction of rotation of the
in horizontal relation, and the pipes 74 and 76 com
impeller. A housing 60‘ surrounds the impeller and is
municate with ‘the interior or chamber through the end
mounted for rotative movement coaxially thereof. The
wall 86, with the pipe 76 communicating in the upper.
housing 60 has end members '61 connected by wall mem
, portion of the chamber. It is preferred that a vertical
bers 62 to de?ne ‘a cylindrical housing with the wall mem~
ba?le 96 be arranged in the chamber 95 preferably spaced
bers 62 spaced to de?ne an inlet opening 63 and a dis
in the upper portion and extending downwardly there
from, said ba?-le being used to press heater element 97
against the chamber 95‘ to facilitate rapid heat transfer
and other particles into the interior of the housing 60.
60 to chamber. A zinc anode or the like is placed in cham
The housing 60 is oscillated by means of a connecting
ber 95 to reduce corrosion or galvanic action in the
rod 66 having one end pivotally, connected as at 67 with
metals forming the steam generator.
' the housing 60* inrspaced relation to the axis thereof and
An immersion type heating element 97 is arranged in
with the other end of the connecting rod pivotally con—
the
chamber 95 adjacent the lower portion thereof and,’
nected as at 68 with a crank member 69 ?xed on a shaft
charge opening 64, the inlet opening 63 preferably being
covered by a fine screen 65 to prevent passage of food
70 which extends through the end wall 5 to a small
motor 7-1. ‘Operation of the motor 71 rotates the shaft 70
and crank 69 to oscillate the housing 60 whereby rotation
of the impeller and oscillation of the housing causes wash
liquid tov be drawn through the screen 65 into the interior
in the illustrated structure, said electrical heating ele- '
ment is arranged in a U-shape with the legs extending
through the end wall 86 with terminals for connection
into an electnic circuit as later described. The. inner end
of the heating element preferably is positioned on a metal»
=spacer 98 that rests on the lower portion of the wall 89
of the‘housing and the impeller drives said wash liquid 70 to
render the tank wall 89 quickly responsive to change
through the opening 64 with substantial velocity. Rota~
of temperature in the interior of the tank. and prevent
'tion of the impeller is such that the sheet or streams of
wash liquid are directed from the housing 60 substana
tially tangentially of the portion 72 of the housing and
galvanic corrosion. VA switch structure 99‘ is arranged on
the steam generator and is responsive to a predetermined
thermal expansion or extension of the length of the tank a
3,072,128
5
6
to control the supply of electric current to the heating
element, the electrical contacts 100 and 101 of the switch
of the switch 99, and a conductor 133 to the lead 111,
the ‘timer being set for a duration of operation whereby
99 being arranged to be in circuit-making position when I
the heating element is energized for a period su?icient
the temperature in the steam generator is at or below
to generate most of the water in the steam generator into
a desired steam-generating temperautre as, for example,
steam for delivery to the washing compartment. If the
below 215° F., and said contacts separated or in circuit
generation of the water into steam is complete, the switch
breaking position when the temperature rises above a
99 will interrupt the ?ow of current to the heating ele
predetermined maximum as when all of ‘the water in the
ment 97 periodically to prevent overheating of same
chamber 95 is evaporated therefrom. In the structure
until the time interval established by the timing switch
illustrated, the switch 99 has laterally spaced ?at resilient 10 53 has elapsed, at which time the timer moves the switch
members 102 and 10‘31wi-th their ends connected to blocks
arm 112 to interrupt the circuit to the pump and to the
104 and 105 arranged whereby the spring members 102
heating element.
In the operation of a dishwashing apparatus constructed
and 103 are biased ‘toward each other. The block 105
is secured by a suitable fastening device 106 to a bracket
and assembled as described, the door 11 is opened, and
107 ?xed to the end member 87 as by one of the clamp— 15 the racks 23 pulled outwardly on the door and loaded with
ing screws '93. The block 104 is slidably mounted on a
articles to be washed. A suitable quantity of detergent shank 108 which is preferably threaded and provided with
is then placed in the dishwashing compartment as by
adjusting nuts 109, said shank 108 being ?xed relative to
sprinkling on the bottom wall '7. The rack 23 loaded
the end plate 86 whereby the adjusting nuts 109 may
with the articles is then moved into the dishwashing com
move the block 104 relative thereto. Movement of the
partment and the door 11 moved to closed position.
block 104 toward the end plate 86 tends to apply ten
Timer knob 53 is then moved to the required time interval,
sion, to the spring members 102 and 103 and separate
thereby effecting closing of the switch 112 and moving
the contacts 100 and 101, this adjustment being arranged
the switch arm 113 into engagement with the contact 116
whereby a predetermined expansion or extension of the
energizing the motors 55 and 71 to operate the distributor
Wall 89 of the steam generator effecting greater spacing 25 mechanism, and also energizing the solenoid valve 75 to
of the end members 86 and 87 will separate the contacts
open same for flow of hot Water through the pipe 74 to
100 and 101 and thereby interrupt the circuit to the heat
the steam generator. The hot water will ?ow into the
ing element 97 and, on cooling of the steam generator,
chamber 95 of the steam generator, ?lling same and then
the wall 89 will contract whereby the spring members
the water will flow under pressure through the pipe 76
102 and 103 will again move the contacts 100‘ and 101 30 and be discharged into the inlet 78 of the duct 79‘ for
into circuit-making position.
delivery into the washing compartment. While a small
In the electric circuit, as illustrated in FIG. 5, leads
quantity of the water will escape through the ori?ce 20
110 and 111 are connected to a suitable source of elec
to the drain, the water level will gradually increase in
trical energy as to an outlet of a house circuit. The
the washing compartment and, as it reaches a height
timer assembly 53 preferably is ‘arranged whereby a 35 whereby it is engaged by the impeller of the distributor,
main switch 112' in ‘the lead 110 is closed during the
the water will be directed in streams against the articles
entire time interval of desired operation of any of the
in the racks, the streams traversing the washing compart
apparatus. A second switch 113 is of a two-position type
ment. The flow of water into the Washing compartment
to provide a washing rinsing cycle ‘and a steaming cycle.
will continue and, after it reaches a level of the over?ow
A suitable timer has cams 114 and 115 to operate the 40 opening 19, the level will be maintained constant with
switches 112 and 113 respectively whereby when the
the water being discharged through the drain at the same
timer knob is operated to ettect operation of the wash-v
rate as the input into the washing compartment._ This
ing machine the switch 112 is in circuit-making position
hot water ?ows through the steam generator continuously,
and switch him 113 is moved to engage a contact 116
but preferably the heating element 97 is not energized
to a conductor 117. A switch 118 is located in the con 45 during the washing cycle. The detergent mixes with the
ductor 117, said switch being actuated by the door 11
water in the washing compartment and, since there is con
whereby the switch is in circuit-making position when
tinuous ?ow during the washing cycle, the washing liquid
the door is closed and is moved to circuit-interrupting
consisting of the water and detergent thrown against the
position when the door is moved toward open position.
The switch 118 closes the circuit through a conductor
119 to a solenoid valve 75 in the feed’ line 74 whereby
when the solenoid is energized the valve is opened, the
circuit being completed from the solenoid valve 75
through a conductor 120 ‘to the lead 111. The switch
118 also connects the circuit through a conductor 121 55
to a motor control 122 which is in turn connected to con
ductors 123' and 124 to motors 71 and 55 respectively
‘ which are in parallel circuit, the motors being connected
dishes with substantial force by the distributor 2-1 will
eiiect a washing action removing particles of food and
the like from the articles.
it has been found that a
regulated ?ow of approximately three quarts of water per
minute being delivered to the washing compartment pro
vides a suitable rate when the sump 17 is sized to ac
cumulate approximately one gallon of water when the
overflow level is reached. It has also been found that ap
proximately seven gallons of Water introduced into the
washing chamber provides sufficient rinsing using water
through conductors 125 and 126 respectively to the lead
from the Water supply. Such Water change occurs auto
110. The drain from the drain pipe 18 may be of a 00 matically without varying the timer cams, electrical cir
gravity ?ow type’or may be supplied with a pump and,
cuit or use of mechanical devices. Water change occurs
in the circuit of FIG. 5, a pump motor 127 is connected
by displacing water containing detergent and soil down the
by a conductor v128 to the circuit between the switches 112
drain with incoming water.‘ This is accomplished with?
and 113 with the other side of the pump driving motor
out stopping the impeller of the distributor or reducing
connected by a conductor 129‘ to the lead 111 whereby
the ?ow of washing or rinsing action from this device.
the pump motor 1127 will operate throughout ‘the cycle
It has been further found that a steam generator with ‘a
of the washing and steaming'operations. 'At the end of
capacity of approximately three pints is very satisfactory
the predetermined washing time, the timer switch 53
for ordinary dishwashing and steaming apparatus,»
moves the switch arm 113 into engagement with a con
When the washing-rinsing cycle has been continued for
tact 130 ‘interrupting the circuit to the solenoid valve 75 ' 70 a predetermined period of time and, preferably, in a pe
and motors 7'1 and 55 thereby shutting off flow of water
from the feed line 74 and stopping the impeller ‘or dis
tributor in the washing compartment. The circuit is
then completed through a conductor 132, ‘the heating
riod in which approximately seven gallons of water is
delivered to the steamer in the ?ow to the washing com
partment, the articles will have been washed and rinsed,
and the timer will then indicate completion of the cycle
element 97 and then through the contacts 100 and 101 75 by moving the switch arm 113 into engagement with the ~
3,072,128
7
contact 130, interrupting the circuit to the valve 75 and
motors 71 and 55, stopping flow of Water through the
steam generator to the washing compartment and stopping
operation of the Wash liquid distributor.
for disposing of minerals obtained from production of dis
tilled water.
It is to be understood that while I have illustrated and
described one form of my invention, it is not to vbe limited
The heating
element 97 is then energized to heat the water which ac 5
cumulated and remains in the chamber
to generate
to the speci?c form or arrangement of parts herein de
scribed and shown except insofar as such limitations are
steam therefrom. As long as water remains in the cham
included in the claims.
What I claim and desire to secure by Letters Patent is:
ber 95, the elongation of the wall $9 will be insuilicient
to effect su?'icient movement of the switch 99 to separate
1. A steam generating apparatus comprising, an elon
the contacts ltlil and ltll. As the steam is generated, it, 10 gate receptacle having spaced ends connected by side walls
is discharged through the pipe 76 and into the duct 79
de?ning a chamber, said side walls being of metal having
for ?ow into the washing compartment. When the steam
reaches the articles, it will be condensed onto the articles,
creating a distilled water rinse of said articles. The ‘build
up of steam condensate causes the articles to drip, thus, 15
substantial expansion and contraction in response to in
crease and decrease in temperature, a liquid supply com
municating with the chamber, a discharge duct communi
displacing droplets previously left on the articles, these
droplets normally containing minerals that would leave
“water spots” when the articles dry. Also, the steam ?ow
cating ‘with the chamber adjacent the upper portion there
of, means in the liquid supply operative for permitting
?ow of liquid to the chamber for a predetermined period
whereby liquid ?lls said chamber and then is discharged
into the inlet 78 of the duct 79 induces ?ow of air from
through the discharge duct, an electric heater device in
the vent chamber 83 so that steam moving through the 20 said chamber for generating steam from liquid therein,
opening 84- will be drawn back into the washing compart
said electric heater being positioned adjacent the side walls
ment through the duct '79 by the inducement of the steam
of the receptacle, and means selectively energizing said
?ow into the duct. If all of the water is converted into
electric heater, said steam generating apparatus being
steam in the steam generator, the heat from the heating
characterized by the expansion and contraction between
element 97 will not be dissipated through water and there- 25 heating and cooling of said side walls being greater than
by will increase the temperature in the chamber 95, but
the expansion and contraction of any scale deposited from
that increase in temperature will be quickly sensed through
generating of steam whereby upon generating steam from
the pad 98 by the wall 89 effecting further expansion of
liquid remaining in the chamber after ?ow of liquid there
same whereby the elongation of the wall 89 will actuate
to has stopped and the receptacle allowed to cool any scale
the switch 99 to separate the contacts real and ltl‘ll inter 30 on the side walls will crack from said side walls and be
rupting the circuit to the heating element 97 to prevent
overheating of same. While the circuit to the heating ele
ment is interrupted, the steam generator wall $9 will tend
to cool and contract whereby the switch 99‘ will be actu
ated to engage the contacts 1% and lltll and again re
store the circuit to the heating element 97. This making
and interrupting of the circuit to the heating element will
continue until the timing switch completes the cycle period
of operation at which time the switch
is moved to
interrupt the circuit and stop‘ operation.
During the conversion of the water in the chamber 95
of the steam generator to steam, there will be some scale
deposited on the walls of the generator, this scale being
the mineral removed from the steam condensate; however,
the scale so deposited has a different coeiiicient of expan
sion than the metal of the wall 89. Therefore, upon com
pletion of the washing and steaming cycle, the contraction
of the wall 89 being different than that of the scale will
cause the scale to crack and tend to separate in small
particles from the interior surface of the wall
Then,
upon the next washing operation, the initial water ?owing
through the chamber 95 of the steam generator, on its
way to the washing compartment, will tend to carry the
carried with liquid ?owed through the chamber and dis
charge duct in the next sequence of operation.
2. A steam generating apparatus comprising, an elon
gate receptacle having spaced ends connected by side walls
35 de?ning a chamber, said side walls ‘being of metal having
substantial expansion and contraction in response. to in
crease and decrease in temperature, a liquid supply com
municating with the chamber, a discharge duct communi
cating with the chamber adjacent the upper portion there
40 of, means in the liquid supply operative for permitting
?ow of liquid to the chamber for a predetermined period
whereby liquid ?lls said chamber and then is discharged
through the discharge duct and the chamber contains a
quantity of liquid on stopping of the liquid supply, an
electric heater device in said chamber for generating steam
from liquid therein, said electric heater being positioned
adjacent the side walls or" the receptacle, means forming an
energizing circuit including the electric heater, a switch
in said energizing circuit including normally engaging con
tacts, and means supporting said contacts for relative
movement and responsive to a predetermined expansion
of said receptacle side walls to separate said contacts and
interrupt said energizing circuit, said steam generating
apparatus being characterized by the expansion and con
fine particles of scale therewith, thereby providing a self
cleaning operation which tends to maintain the steam 55 traction ‘between heating and cooling of said side walls
generator free of scale.
After completion of a steam
ing operation, the articles will ‘be hot and then opening
being greater than the expansion and contraction of any '
scale deposited from generating of steam whereby upon
generating steam from liquid remaining in the chamber
of the door 11 will allow air to enter and steam to escape,
after flow of liquid thereto has stopped and the receptacle
providing a very rapid or flash drying of the articles.
However, the door may be allowed to remain closed and 60 allowed to cool any scale on the side walls will crack from
'
said side walls and be carried with liquid ?owed through
most all of the water being drained from the washing
the chamber and discharge duct in the next sequence of
compartment will provide an air inlet vent under the door
operation. ,
‘
whereby the dishes will dry and be ready for use when
3.
In
a
steam
generating
apparatus
comprising,
a closed
removed from the washing compartment. The air inlet
receptacle. having walls extending longitudinally thereof
at low level allows outside cooler air to enter and dis 65
de?ning a tubular structure and closed ends forming a
place the moist hot air through the upper vent chamber
closed
chamber therein, said longitudinal walls being of
It is believed obvious that lhave provided a dish-wash
metal having substantial expansion and contraction in
ing apparatus and steamer for elliciently washing and
response to increase and decrease in temperature, a liquid
rinsing dishes and the like, obtaining any desired number 70 supply line communicating with the chamber fordelivery
of water changes which occur simultaneously during the
of liquid thereto, a discharge duct communicating with
application of forceful streams of recirculated liquid to the
the chamber adjacent the upper portion thereof whereby
articles to be cleaned, and generating and applying steam
liquid from the liquid supply line after ?lling the chamber
thereto to effect additional rinsing with distilled water and
will ilow from the discharge duct, control means including
rapid drying free of water spots and the like, and means 75 a valve in said liquid supply line for. permitting ?ow, of
3,072,128
liquid through the chamber for a predetermined period
and then stopping ?ow whereby the chamber is full of
liquid, an electric heater having portions in the chamber
10
water under pressure to said receptacle, a duct having one
end communicating with the interior of said washing
compartment and the other end open exteriorly of said
adjacent the longitudinal wall, means forming an ener
gizing circuit including the electric heater to generate
steam from the liquid remaining in said chamber for dis
charge through a discharge duct, and a switch in said
energizing circuit and responsive to a predetermined ther
mal expansion of the longitudinal wall to interrupt said
compartment, a second ?ow line communicating with the
liquid thereto at a rate greater than the drain ?ow through
compartment therein, a closed receptacle, a flow line for
delivery of hot water under pressure to said receptacle, a
duct having one end communicating with the interior of
said washing compartment and the other end open ex
teriorly of said compartment, a second ?ow line commu
receptacle adjacent the upper portion thereof and having
a discharge end aligned with and spaced from the open
end of said duct whereby ?ow from said second flow line
is directed into said duct for delivery to said washing com
partment, an electric heating device in said receptacle for
energizing circuit, said longitudinal wall of the receptacle 10 heating water therein and generating steam, control means
including a valve in said ?rst-named ?ow line for permit
being characterized by having a thermal expansion and
ting ?ow of hot water through the receptacle and to the
contraction different from the thermal expansion and con
washing compartment for a predetermined period and
traction of scale deposited thereon in generating steam
stopping ?ow at the end thereof, an impeller in the wash
from liquid remaining in the receptacle chamber whereby
upon cooling and contraction of said longitudinal wall the 15 ing compartment, means for operating said impeller to
direct water against articles in said compartment to wash
scale cracks therefrom and is carried with liquid from the
said articles, and means forming an energizing circuit in—
receptacle chamber in the flow of liquid through the
cluding the electric heater and operative to energize the
chamber on the next sequence of operations.
electric heater to generate steam from the water remain
4. In a dishwashing machine, a casing de?ning a wash
ing compartment having a bottom, means for holding ar 20 ing in said receptacle at the end of said predetermined
period for delivery of said steam after completion of a
ticles to be washed in said compartment in spaced relation
washing cycle to said washing compartment where said
to said bottom, a drain ?tting in said bottom having a
steam condenses on articles therein and provides a dis
large opening at maximum liquid level and a restricted
tilled water rinse.
opening adjacent said bottom, hot water supply- means
7. In a dishwashing machine, a casing having a washing
communicating ‘with said compartment for, conveying 25
said restricted opening and lesser than drain ?ow through
said large opening, means directing liquid from adjacent
the bottom of said compartment against articles therein
for a predetermined period, a closed receptacle in the hot 30
water supply means between a source and the compart
nicating with the receptacle adjacent the upper portion
ment with the connection to the compartment being at the
thereof and having a discharge end aligned with and
spaced from the open end of said duct whereby ?ow from
upper portion of said receptacle whereby liquid flow to
the compartment is through the receptacle and ?lls ‘same,
said second ?ow line is directed into said duct for delivery
control means including a valve upstream from the recep 35 to said washing compartment, an electric heating device in
tacle and operable for ?ow of liquid to the compartment
for a predetermined period of dishwashing cycle and stop
said receptacle for heating water therein and generating
steam, control means including a valve in said hot water
?ow line upstream from said receptacle for permitting ?ow
of hot water through the receptacle and to the washing
receptacle and operable at the end of the predetermined
period of washing cycle to heat the liquid remaining in 40 compartment for a predetermined period and then stop
ping ?ow at the end thereof, an impeller in the washing‘
the receptacle at the end of said predetermined period of
ping ?ow at the end thereof, and a heating means in the
compartment, an electric motor for operating said impel
ler to direct water against articles in said compartment
to wash said articles, means forming an energizing circuit
compartment.
5.‘ In a dishwashing machine, a casing de?ning a wash 45 including said motor and the electric heater and operative
in a sequence whereby the electric motor is operated to
ing compartment having a bottom, means for holding
washing cycle to convert said liquid to steam for delivery
to the washing compartment to steam the articles in said
,drive the impeller during flow of water to the washing
compartment and is then stopped and the electric heater
energized to generate steam from the water remaining in
a large opening at maximum liquid level and a restricted
opening adjacent said bottom, hot water supply means 50 said receptacle at the end of saidpredetermined period
for delivery of said steam after completion of the washing
communicating with said compartment for conveying liq
cycle to said washing compartment, said receptacle being
uid thereto at a rate greater than the drain flow through
of‘ metal having substantial expansion and contraction in
said restricted opening and lesser than drain ?ow through
response to increase and decrease in temperature, switch
.said large opening, means directing liquid from adjacent
the bottom of said compartment against articles therein 55 means in the electric circuit to the electric heater including
normally engaging contacts, and means supporting said
for a predetermined period, a closed receptacle in the hot
articles to be washed in said compartment in spaced rela
tion to said bottom, a drain ?tting in said bottom having
contacts for relative movement and responsive to expan
sion of said receptacle by a predetermined increase in tem
perature above the ‘boiling point of water to separate said
the upper portion of said receptacle whereby liquid flow
to the compartment is through the receptacle ‘and ?lls 60 contacts and interrupt said energizing circuit to the elec
tric heater.
,
'
.
same, control means including a valve upstream from the
8. In a dishwashing machine, a casing de?ning a wash
receptacle and operable for flow of liquid to the compart
ment for a predetermined period of ‘dishwashing cycle and
ing compartment having a bottom, means for holding ar
ticles to be washed in said compartment in spaced rela
stopping ‘?ow at the end thereof, a heating means in'the
receptacle and operable at the end of the predetermined 65 tion to said bottom, a drain ?tting in said bottom having
period of washing cycle to heat liquid remaining in the
a large opening at maximum liquid level and a restricted
water supply means between a source and the compart
ment with the connection to the compartment being at
receptacle at the end of said predetermined period of
washing cycle to convert said liquid to steam for delivery
opening adjacent said bottom, hot water ‘supply means
communicating with said compartment for conveying
to the washing compartment to steam the articles in said
liquid thereto at a ratepgreater than the drain ?ow through
compartment, and means responsive to a predetermined 70 said restricted opening and lesser than the drain ?ow
rise of temperature in the’ receptacle above the boiling
through said large opening, a closed receptacle in the hot
point ‘of said liquid for interrupting heating thereof.
water supply means between a source and the compart
ment with the connection to the compartment being at the
6. In a dishwashing machine, a casing having a washing
upper portion of said receptacle whereby liquid ?owing
compartment therein adapted to contain articles to be
washed, a closed receptacle, a flow line for delivery of hot 75 through the compartment ?ows through the receptacle and
3,072,128
11
12
?lls same, an electric heating device in said receptacle for
heating water therein and generating steam, control means
including a valve in said hot water supply means upstream
from said receptacle for permitting ?ow of hot water
through the receptacle and to the washing compartment
for a predetermined period and then stopping ?ow at the
end thereof, an impeller in the washing compartment, an
electric motor for operating said impeller to direct water
against articles in the compartment to wash said articles,
sponsive to expansion of said receptacle by a predeter
mined increase in temperature above the boiling point of
water to separate said contacts and interrupt said ener
water supply means bet-ween a source and the compart
water to separate said contacts and interrupt said ener
gizing circuit to the electric heater.
10. In a dishwashing machine, a ‘washing compartment
having a bottom, means supporting articles to be washed
in said compartment in spaced relation to said bottom,
said compartment having a vent in the upper portion there
of communicating to atmosphere, a drain in the bottom
means forming an energizing circuit including said con 10 of said compartment having a large opening at maximum
trol means and the electric heater and operative in a se
liquid level and a restricted opening adjacent said bottom,
quence whereby the electric motor after ?ow of water to
a vent passage to atmosphere above the maximum liquid
the washing compartment is stopped and the electric heater
level and opening into said compartment below said maxi
is energized to generate steam from the water remaining
mum liquid level whereby said vent passage is closed by
in said receptacle for delivery of said steam after com 16 liquid when the level is at maximum and is open when
pletion of the washing cycle to said washing compartment,
the liquid level is drained to below the passage opening in
said receptacle being of metal having substantial expansion
the compartment, hot water supply means communicating
and contraction in response to increase and decrease in
with said compartment for conveying liquid thereto at a
temperature, switch means in the electric circuit to the
rate greater than the drain ?ow through said restricted
electric heater including normally engaging contacts, and 20 opening and lesser than drain flow through said large
means supporting said contacts for relative movement and
opening, means directing liquid from adjacent the bottom
responsive to expansion of said receptacle by a predeter
of said compartment against articles therein for a pre
mined increase in temperature above the boiling point of
determined washing period, a closed receptacle in the hot
gizing circuit to the electric heater.
25 ment with the connection to the compartment being at the
9. In a dishwashing machine, a casing de?ning a wash
upper portion of said receptacle whereby liquid ?ow to the
ing compartment having a bottom, means for holding ar
compartment is through the receptacle and ?lls same, con
ticles to be washed in said compartment in spaced relation
trol means including a valve upstream from the receptacle
to said bottom, a drain ?tting in said bottom having a
and operable for controlling ?ow of liquid to the com
large opening at maximum liquid level and a restricted 30 partment for a predetermined period of dishwashing cycle
opening adjacent said bottom, hot water supply means
and stopping ?ow at the end thereof, and means for heat
communicating with said compartment for conveying liq
ing the liquid in the receptacle and operable at the end of
uid thereto at a rate greater than the drain ?ow through
the predetermined period of washing cycle to heat the
said restricted opening and lesser than the drain ?ow
liquid remaining in the receptacle at the end of said pre
through said large opening, a closed receptacle in the hot 35 determined period of washing cycle to convert said liquid
water supply means between a source and the compart
to steam for discharge through the connection from the
ment with the connection to the compartment being at the
receptacle to the compartment whereby said steam con
upper portion of said receptacle whereby liquid ?owing
through the compartment flows through the receptacle and
?lls same, an electric heating device in said receptacle for
heating water therein and generating steam, control means
including a valve in said hot water supply means upstream
from said receptacle for permitting ?ow of hot water
denses on articles in the compartment and provides a dis
tilled water rinse, said steam heating said articles whereby
upon completion of the conversion of the water in the
receptacle to steam and draining of water from the com
partment to a level below ‘the opening of the vent passage
in thecompartment allows airto enter through said vent
through the receptacle and to the washing compartment
passage and escape through the upper vent of the compart
for ‘a predetermined period and then stopping said ?ow 45 ment to facilitate drying of the articles.
at the end of said period, an impeller in the washing com
partment, an electric motor for operating said impeller to
direct Water against articles in said‘ compartment to wash
said articles, means forming an energizing circuit includ
ing said motor and the electric heater and operative in a 50
sequence whereby the electric motor is operated to drive
the impeller during flow of water to the washing compart
ment and is then stopped and the electric heater energized
to generate steam from the water remaining in said recep
tacle for delivery of said steam after completion of the 55
washing cycle to said washing compartment, said recep
tacle being of metal having substantial expansion and con
traction in response to increase and decrease in tempera
ture, switch means in the electric circuit to the electric
heater including normally engaging contacts, and means 60
supporting said contacts for relative movement and re
References Cited in the ?le of this patent
UNITED STATES PATENTS
855,210
1,574,132
1,735,415
1,884,180
Steward _____________ __ May
Smyser ______________ __ Feb.
Spinney et al _________ __ Nov.
Pauly _______________ __ Oct.
28,
23,
12,
25,
1907
1926
1929
1932
2,127,778
2,664,094
2,781,765
Lewis _______________ __ Aug. 23, 1938
Spragins _____________ __ Dec. 29, 1953
Steidley _____________ __ Feb. 19, 1957
2,842,144
Lyman _______________ “July 8, 1958
2,881,780
Johnson et a1 _________ 2. Apr. 14', 1959‘
44,507
Norway ________ -2 ____ __ Oct. 17, 1927
857,428
Germany ________ _______ Nov. 27, 1952
FOREIGN PATENTS
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