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Патент USA US3088487

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May 7, 1963
3,088,474
R. V. LESLIE
DISHWASHING MACHINE WITH SPRAY TUBE ROTATIONAL SPEED ANALYZER
Filed QO'b- 9, 1961
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38
Fig. 3
INVENTOR.
Ralph M Leslie
Fig. /
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His Attorney
United States Patent C) " ICC?
1
3,088,474
DKSHWASHII‘JG MACHINE WHTH SPRAY THEE
RUTATIONAL SPEED ANALYZER
Ralph ‘V. Lesiie, Englewood, Uhio, assignar to General
Motors Corporation, Detroit, Mich” a corporation of
Deiaware
Filed 0st. 9, 1961, Ser. No. 143,755
6 Claims. (Cl. 134-113)
This invention relates to a domestic appliance and more
particularly to a speed analyzer for the spray tube of a
dishwasher.
3,938,474
Patented May 7, 1963
2
panel of plastic or other suitable material 42 which is
coextensive with the front opening 16. When the trans
parent panel 42 is installed as shown in FIGURE 1, the
interior of the dishwashing chamber 14 becomes viewable.
In this connection, when the dishwasher door 38 is in its
open position as shown in FIGURE 1, a door switch 44
is actuated to deenergize the electrical components of the
dishwasher.
The spray tube 26 is comprised of a cylindrical plastic
tube having a closed front bearing end 48 and an open
rear inlet end 50. A plurality of slots or perforations
52 are disposed along the length of the spray tube 26
The dishwashing art has been troubled for some time
and serve to direct the spray over supporting baskets 56
above and below the spray tube. At the rear of the spray
rotation. The problem is made somewhat more complex 15 tube 26 a swirl inducing header 58 is positioned for IC
by the fact that the interior of a dishwashing chamber is
tatably supporting the rear end 50 of the spray tube. A
obscured by the steam and mist which is produced by the
support rod 60 extends from the header 58 or the back
operating spray tube. Further, it is impossible to view
wall of the dishwasher casing to the front end where a
with the problem of ascertaining the speed of spray tube
the rotating spray tube when the dishwasher door is in its
closed position.
removable bearing 64 rotatably journals the front end 48
of the spray tube. The bearing 64 is provided with a
threaded shaft and knob 66 which may be removed or
a means whereby the rotating speed of a washing machine
unscrewed from the support 60 to remove the spray tube
spray device can be ascertained while the machine is in
26. For further details as to the construction of the spray
operation.
tube and the manner in which the swirl of water through
More particularly, it is an object of this invention to 25 the center of the spray tube induces the rotation thereof,
provide a speed analyzer for a horizontally rotatable dish
reference may be had to the patent to Abresch et al.
washer spray tube in a washing chamber, said speed anal
2,973,907 issued March 7, 1961. Thus when the motor 24
yzer being comprised of a ?uorescently segmented disc
is energized and water exists in the sump 20 of the dish
frictionally engageable and rotatable with the spray tube
washer, water will be directed through the conduit 28 to
and an ultraviolet lamp outside of the chamber for cast 30 the swirl inducing spray header 58. As swirl is imparted
ing light on the ?uorescent segments as an indication of
to the pumped water the swirl will cause the spray tube 26
spray tube speed.
to rotate and the water pumped will issue from the slots
Further objects and advantages of the present invention
52 to thoroughly cover and cleanse the utensils supported
will be apparent from the following description, reference
in the baskets 56.
’ Accordingly it is an object of this invention to provide
being had to the accompanying drawings wherein a pre 35
‘It has been found that the cleanability of the dishwasher
ferred embodiment of the present invention is clearly
10 depends in large measure upon the proper distribution
shown.
of washing fluid within the dishwashing chamber 12. This
In the drawings:
distribution depends upon the speed of rotation or r.p.m.
FIGURE 1 is a generally schematic side sectional view
of the spray tube 26. In the past it has been difficult to
of a dishwashing machine suitable for use with this in 40 ascertain the correct speed of the spray tube due to the
darkness of the interior of the dishwashing chamber and
vention;
FIGURE 2 is a fragmentary perspective view of the
speed analyzer of this invention; and
the obscurity of the spray tube due .to the swirling and
spraying water within the chamber. The spraying water
and the steam produced thereby so confuses the interior of
FIGURE 3 is an enlarged elevational view of the strobe
45 the dishwashing chamber that normal stroboscopic meth
disc used with this invention.
In accordance with this invention and with reference
ods to ascertain rotative speed are unavailing. This inven
to FIGURE 1 a dishwasher 1th is schematically set forth.
tion is directed to an improved manner for utilizing the
The dishwasher 10 is comprised of a casing 12 which de
stroboscopic theory which will overcome the problem cre
?nes a dishwashing or water distribution chamber 14 hav
ated by an operating dishwasher and will still provide ac
ing a front opening 16. The bottom of the dishwashing 50 curate data on the speed of spray tube rotation. The re
chamber 14 is closed by a bulkhead or bottom wall 18
which has a depressed or sump area 20 in a central por—
sults of such tests can be used to evaluate the pump 22 and
the motor 24. in order to insure that the proper amount
tion thereof. The sump leads to a pump 22 which is
of ?uid is being recirculated between the sump 20 and the
operated by a motor 24. Within the dishwashing cham
spray tube 26.
.ber 14 a rotatably mounted spray tube 26 is positioned 55
With reference to FIGURES 1 and 3 the spray tube
and interconnected with the pump 22 by way of a conduit
28. interposed in the ?uid stream between the spray tube
and the pump is a diverter valve 30 which may be selec
tively energized to direct the output of the pump either
analyzer is shown comprised of a black light 70 and a
strobe disc 72. The strobe disc '72 may be formed of
resilient rubber or other ?exible material in the form of
34 and a heater 36 is included in the sump for drying the
dishes at the conclusion of the dishwashing cycle and
for maintaining the temperature of the water during the
78 and 80 respectively in an outstanding ?uorescent paint.
a washer having an outer circle or band 74 and an inner
to the spray tube 26 or to a drain line 32. Water may 60 circle or band 76 concentric with the outer circle 74. On
be admitted to the sump 2th by means of a water valve
each of the bands 74 are painted or silk screened segments
The segments 78 and 80‘ have been painted with a red
?uorescent paint which has been found suitable for use in
65 the obscure interior of an operating dishwasher. Inter
dishwashing cycle.
Normally the front opening 16 of dishwashing chamber
posed between the segments 78 and the segments 80 are
is closed by a door 38 which is hingedly mounted at 40
spacing segments 82 and 84 which are formed of a sub
so that the door may be placed in a vertical position for
dued ?uorescent paint such as yellow. Note that the
closing the dishwashing chamber and in a horizontally
segments 78 in the outer circle are shorter than the seg
disposed position for loading the dishwasher. However, 70 ments 80 on the inner circle 76. The reason for this con
for the purposes of this invention the front opening 16
of the dishwashing chamber is closed by a transparent
struction is to provide for different speed indicators for
the spray tube 26. For instance, the smaller outer colored
3,088,474
3
4
segments, when appearing to stand still, indicate a slower
speed than the larger segments on the inner circle.
The black light 70 is formed as a rectangular box-like
structure having an open side 90 through which light may
spray distribution within the dishwashing chamber and
indicates that correction is necessary.
One bulb found suitable for use with this invention is
It should now be seen that an improved speed analyzer
has been provided for a rotating spray tube in a dish
washer. The inherent problem of visibility in a steam
clouded dishwashing chamber is overcome by the appli
made by the Sylvania Company and is classi?ed as F 15
cation of a strobe disc utilizing ?uorescent segments in
TH/BLB, Blacklite Blue and is 15 watts in size. The
ultraviolet lamp is designed to operate on a 60-cycle fre
segments to show through the cloudy atmosphere within
quency which cooperates with the strobe disc 72 as a 10
the dishwasher.
means for indicating proper spray tube speed.
While the embodiment of the present invention as herein
disclosed constitutes a preferred form, it is to be under
stood that other forms might be adopted.
be directed from a black light bulb or ultraviolet lamp 92.
combination with a ultraviolet lamp which causes the
_
The manner in which the spray tube on the dishwasher
can be checked for proper speed will now be explained
What is claimed is as follows:
more fully and with reference to FIGURE 2 of the draw
1. In combination, casing means de?ning a dishwashing
ings. The serviceman will ?rst open the door 38 of the 15
chamber having a front opening and a sump, means for
dishwasher and remove the spray tube bearing knob 66
supplying hot water to said sump, a transparent panel for
which supports the front end of the spray tube. At this
closing said front opening, a horizontal, hollow cylin
time it is careful not to disturb the rear end 50 of the
drical spray tube in said chamber having a closed front
spray tube which is journaled in the swirl inducing hous
end extending toward said front opening, an open rear
ing 58. Next, place‘ the strobe disc 72 over the end of the
inlet end and a plurality of water distributing slots dis
spray tube with the segmented design toward the front of
posed along the length of said spray tube, a swirl-inducing
the dishwasher. Mount the disc as close to the front of
header for rotatably mounting the rear inlet end of said
the spray tube as possible so that it does not block the
spray tube, a pump connected to said sump for pumping
spray issuing from the spray tube slots 52. Then replace
water to said header for producing a swirl throughout
the spray tube knob 66 so that the bearing portion 64 will
the hollow of said spray tube to rotate said spray tube,
extend into a cavity at the front end of the spray tube.
a ?exible circular disc frictionally engaging the front end
Manually rotate the spray tube to assure that it turns
of said spray tube for rotation therewith on the inside of
freely and that the disc 72 does not touch the support bar
said panel, said disc having radially inner and outer con
60 as it turns. (Ilose the door and start the dishwasher
centric circles of spaced ?uorescent segments facing out
to energize the ?ll valve 34. After a normal ?ll is reached,
wardly from said chamber toward said front opening, the
open the door 38 and install the transparent panel 42 over
segments on said inner circle being sized to represent
the chamber opening.
one rotating speed for said spray tube and the segments
It will be necessary to block the door switch 44 either
on said outer circle being sized to represent another ro
mechanically or electrically so that the dishwasher can
be operated with the door 38 open. Such overriding of
the door switch safety feature is well within the skill of
the art. With the motor 24 and the pump 22 in operation
tating speed for said spray tube, and a 60 cycle ultraviolet
lamp positioned on the outside of said panel opposite said
to pump water to the spray tube 26, a cleansing spray will
ments, thereby to indicate by the apparent rotation of
said segments the speed of said spray tube and the pump
ing rate of said pump.
2. In combination, casing means de?ning a chamber
disc in a manner to shed light on said ?uorescent seg
be initiated within the dishwashing chamber 12. The
spray will cloud the atmosphere inside the dishwashing
chamber and will normally prevent observation of the
spray tube speed. However, the operator can then hold
the illuminated black light 70 against the front of the
having an opening and a sump, means for supplying water
transparent panel 42 in a manner to shed its light on the
front face of the strobe disc 72. It should be noted that
the black light 70 can be plugged into any domestic power
supply in order to provide a 60-cycle frequency. It
to said sump, a transparent panel for closing said opening,
a hollow cylindrical spray tube in said chamber having a
closed ?rst end extending toward said opening, an open
second inlet end and a plurality of water distributing slots
disposed along the length of said spray tube, a swirl
should be recognized, however, that other frequencies and
inducing header for rotatably mounting the inlet end of
said spray tube, a pump connected to said sump for pump
other sized ?uorescent segments on the strobe disc could
be used within the purview of this invention. The ?uo
rescent markings on the strobe disc will react according
to the spray tube speed and the 60-cycle frequency of the
ing water to said header for producing a swirl through
out the hollow of said spray tube to rotate said spray tube,
a circular disc frictionally engaging the ?rst end of said
spray tube for rotation therewith on the inside of said
panel, said disc having radially inner and outer concen
black light.
To understand the analysis provided by the strobe disc
72 and the black light 70 the following explanation is ap 55 tric circles of spaced ?uorescent segments facing outward
ly from said chamber toward said opening, the segments
plicable. When the segments 78 on the outer circle and
80 on the inner circle‘ are both blurred, this indicates that
the speed of the spray tube is either too slow or too fast.
When the colored segments in the outer circle appear to
turn counterclockwise and the inner colored segments 60
appear blurred, the spray tube is rotating only slightly be
low proper speed. As the segments in the outer circle
stand still or do not rotate and the inner circle is blurred,
the spray tube is rotating at the proper speed. Conversely,
when the outer colored segments appear to be turning
clockwise while the inner colored segment appears
blurred, the spray tube is rotating slightly above proper
speed. Lastly, when the segments in the outer circle are
blurred and those in the inner circle appear stopped, the
spray tube is operating at a higher than normal speed.
Ordinarily, the serviceman need worry only about those
situations wherein the spray tube is rotating too slowly.
This will indicate some form of blockage or pump mal~
function which causes a lower than normal pumping rate
to the spray tube 26. This indicates a lack of proper
on said inner circle being sized to represent one rotating
speed for said spray tube and the segments on said outer
circle being sized to represent another rotating speed for i
said spray tube, and a black light positioned on the outside
of said panel opposite said disc in a manner to shed ultra
violet light on said ?uorescent segments when connected
to a domestic power supply, thereby to indicate by the
apparent rotation of said segments the speed of said spray
tube and the pumping rate of said pump.
3. In combination, casing means de?ning a chamber
having an opening and a sump, means for supplying water
to said sump, a transparent panel for closing said open
ing, a hollow spray tube in said chamber having a closed
70 end extending toward said opening, an open inlet end and
a water distributing slot disposed along the length of said
spray tube, a swirl-inducing header for rotatably mounting
the inlet end of said spray tube, a pump connected to said
sump for pumping water to said header for producing a
swirl throughout the hollow of said spray tube to rotate
3,088,474
5
6
said spray tube and cause a spray in said chamber, a
said disc having radially inner and outer concentric circles
of spaced ?uorescent segments facing outwardly from said
circular disc engaging the closed end of said spray tube
for rotation therewith on the inside of said panel, said
disc having a circle of spaced ?uorescent segments facing
outwardly from said chamber toward said opening, the
segments being sized to represent one rotating speed for
said spray tube, and an ultraviolet lamp positioned on
the outside of said panel opposite said disc in a manner
to shed light on said ?uorescent segments when connected
chamber in a manner to be seen through said transparent
panel, the segments on said inner circle being sized to
represent one rotating speed and the segments on said
outer circle being sized to represent another rotating speed,
and a 60 cycle ultraviolet lamp positioned outside of
said chamber in a manner to shed its light on said disc,
thereby to indicate by the apparent movement of said seg
to a domestic power supply, thereby to indicate by the 10 ments the speed of said spray device.
apparent rotation of said segments the speed of said spray
6. ‘In combination, means forming a chamber having
an opening, means including a transparent portion for
tube and the pumping rate of said pump.
closing said opening, a rotating spray device in said cham
4. In combination, means forming a water distribution
her, and a speed analyzer for ascertaining the speed of
chamber having an opening, a transparent panel for
closing said opening, a rotating horizontal spray tube in 15 said spray device, said speed analyzer comprising a strobe
member fastened for rotation with said spray device in
said chamber, and a speed analyzer for ascertaining the
speed of said spray tube, said speed analyzer comprising a
said chamber, said strobe member having a circle of
spaced ?uorescent segments facing outwardly from said
circular disc ?tted snugly over said spray tube for rota
tion therewith in said chamber, said disc having radially
chamber in a manner to be seen through said transparent
inner and outer concentric circles of spaced ?uorescent 20 portion, the segments on said circle being sized to repre
segments facing outwardly from said chamber in a man~
sent one rotating speed, and a cyclical lamp positioned
ner to be seen through said transparent panel, the seg
ments on said inner circle being sized to represent one
outside of said chamber in a manner to shed its light on
said strobe member and compatible with the ?uorescence
of said segments, thereby to indicate by the apparent
rotating speed and the segments on said outer circle being
sized to represent another rotating speed, and a 60 cycle 25 movement of said segments the speed of said spray device.
ultraviolet lamp positioned outside of said chamber in a
manner to shed its light through said transparent panel on
References Cited in the ?le of this patent
said disc, thereby to indicate by the apparent movement
of said segments the speed of said spray tube.
UNITED STATES PATENTS
5. In combination, means forming a chamber having 30
an opening, a transparent panel for closing said opening,
a rotating spray device in said chamber, and a speed
analyzer for ascertaining the speed of said spray device,
said speed analyzer comprising a circular disc fastened to
said spray device for rotation therewith in said chamber, 35
1,877,713
2,119,627
2,691,380
2,734,520
3,013,569
Beck _______________ __ Sept. 13, 1932
Kriek ________________ __ June 7, 1938
Bartos ______________ __ Oct. 12, 1954
Abresch _____________ __ Feb. 14, 1956
Sterczala ____________ __. Dec. 19, 1961
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