U.S. patent number 3,800,813 [Application Number 05/249,301] was granted by the patent office on 1974-04-02 for swingable comb for closing magnetic switch for controlling hot rinse water in a dishwasher.
Invention is credited to Tore H. Noren.
United States Patent |
3,800,813 |
Noren |
April 2, 1974 |
SWINGABLE COMB FOR CLOSING MAGNETIC SWITCH FOR CONTROLLING HOT
RINSE WATER IN A DISHWASHER
Abstract
A dishwashing machine having a hot water rinse compartment
through which a train of dish-carrying dollies is moved and a
switch actuating comb is mounted in the compartment and has
depending tines that are swung in one direction by a dish basket
carried by a dolly so as to close a magnetic switch that opens a
solenoid valve for spraying hot rinse water onto the dishes. The
comb tines are so mounted that they can freely swing in the
opposite direction should it become necessary to reverse the
movement of a dolly and its dish basket in the rinse compartment
and the magnetic switch will not be closed and neither will the
tines be damaged during this movement.
Inventors: |
Noren; Tore H. (San Francisco,
CA) |
Family
ID: |
26802620 |
Appl.
No.: |
05/249,301 |
Filed: |
May 1, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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105471 |
Jan 11, 1971 |
3669346 |
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Current U.S.
Class: |
134/46; 134/52;
134/49 |
Current CPC
Class: |
A47L
15/247 (20130101) |
Current International
Class: |
A47L
15/00 (20060101); A47L 15/24 (20060101); B08b
003/02 () |
Field of
Search: |
;134/44,46,47,48,49,52 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Bleutge; Robert L.
Attorney, Agent or Firm: Piper; William R.
Parent Case Text
RELATED APPLICATION
This patent application is a division of my copending application,
Ser. No. 105,471, filed Jan. 11, 1971, now Pat. No. 3,669,346.
Claims
I claim:
1. The combination with the rinse compartment of a dishwashing
machine, a dish-carrying basket and means for moving the basket
through the compartment:
a. a comb comprising a rockably supported shaft extending
transversely across the rinse compartment;
b. a plurality of downwardly depending tines mounted for free
swinging movement on said shaft, said tines normally lying in the
same plane and being positioned in the path of the moving
basket;
c. a transversely extending bar paralleling and spaced from said
shaft with means connecting the bar to the shaft so that a swinging
of the bar about the shaft axis will rock the shaft, said bar when
in normal position being spaced from the plane of the tines, the
basket when moved in one direction through the rinse compartment
striking the tines and swinging them into contact with said bar for
moving the latter and rocking said shaft in one direction;
d. a hot water spray head mounted in said rinse compartment and
connected to a source of hot water for directing rinse water over
the dishes in the basket;
e. normally closed valve for controlling the flow of hot water to
said spray head; and
f. valve actuating means actuated by the shaft when the latter is
rocked in one direction by the tines striking the bar and swinging
it for opening the valve and rinsing the dishes, said bar returning
to normal position and said means closing said valve when the
basket has moved to a point to free the tines and permit them to
return to normal position, said tines being free to swing in the
opposite direction about said shaft and not strike the bar should
the basket be moved in the reverse direction and strike the tines,
whereby the valve will not be opened during any reverse movement of
the basket.
2. The combination as set forth in claim 1: and in which
a. the mounting of the tines for free swinging about said shaft
includes;
b. a separate substantially vertical tubular support for receiving
each tine; and
c. a substantially horizontal sleeve connected to each tubular
support and being freely rockable on said shaft.
3. The combination as set forth in claim 1: and in which
a. said valve actuating means includes a solenoid for opening the
valve when the solenoid is energized;
b. a switch disposed outside of the rinse compartment and used for
connecting the solenoid to an electric current for opening the
valve, said switch being self-closing but held in open position
when in the presence of a magnetic field;
c. a shank connected to said shaft and extending radially
therefrom; and
d. a magnet carried by the outer end of said shank and disposed
within said rinse compartment, said magnet being disposed close to
said switch when the tines and bar are in normal position so that
the magnetic field will maintain the switch open, said shank
swinging away from the switch when the tines are moved by
contacting a moving basket and contact the bar for swinging the
latter and rocking said shaft, whereby the switch will close and
cause the solenoid to open the valve and permit hot water to flow
out through said spray head to rinse the dishes.
4. The combination with the rinse compartment of a dishwashing
machine, a dish-carrying basket and means for moving the basket
through the compartment:
a. a comb extending transversely across the rinse compartment and
including a shaft with depending tines freely swingable about said
shaft in the direction of the path of the moving basket when
contacted by the basket;
b. a hot water spray head mounted in said rinse compartment and
connected to a source of hot water including a valve for directing
rinse water through the spray head and over the dishes in the
basket when the valve is open; and
c. valve actuating means actuated by any one or more of the tines
when they are rocked only in one direction about said shaft by the
moving basket for opening the valve for rinsing the dishes, the
tines returning to their depending position by gravity after the
basket has passed, said tines being free to swing in the opposite
direction about said shaft without actuating said valve actuating
means should the basket be moved in a reverse direction past said
tines.
5. The combination as set forth in claim 4: and in which
a. said valve actuating means includes a solenoid for opening the
valve when the solenoid is energized;
b. a switch disposed outside of the rinse compartment and used for
connecting the solenoid to an electric current for opening the
valve, said switch being self-closing but held in open position
when in the presence of a magnetic field;
c. a shank connected to said shaft and offset laterally therefrom;
and
d. a magnet carried by the outer end of said shank and disposed
within said rinse compartment, said magnet being disposed close to
said switch when the tines are in normal depending position so that
the magnetic field will maintain the switch open, said shank
swinging the magnet away from the switch when the tines are moved
by contacting a moving basket and actuate the valve actuating
means, whereby the switch will close and cause the solenoid to open
the valve and permit hot water to flow out through said spray head
to rinse the dishes.
6. The combination with the rinse compartment of a dishwashing
machine, a dish-carrying basket and means for moving the basket
through the compartment:
a. a comb extending transversely across the rinse compartment and
including depending tines swingable in the direction of the path of
the moving basket when contacted by the basket;
b. a hot water spray head mounted in said rinse compartment and
connected to a source of hot water including a valve for directing
rinse water over the dishes in the basket when the valve is
open;
c. valve actuating means actuated by the tines when they are rocked
only in one direction by the moving basket for opening the valve
for rinsing the dishes, the tines returning to their depending
position after the basket has passed, said tines being free to
swing in the opposite direction without actuating said valve
actuating means should the basket be moved in a reverse
direction;
d. said comb also including a rockably supported shaft, said tines
being mounted for free swinging movement on said shaft and normally
lying in the same plane; and
e. said valve actuating means including a transversely extending
bar paralleling and spaced from said shaft with means connecting
the bar to the shaft so that a swinging of the bar about the shaft
axis will rock said shaft, said bar when in normal position being
spaced from the plane of the tines, said tines being swung by the
basket and striking and swinging the bar when the basket is moved
in one direction for operating said valve actuating means and
opening said valve for rinsing the dishes, said tines being free to
swing in the opposite direction and not strike the bar should the
basket be reversed in its movement and contact the tines in its
reverse movement, whereby said valve will not be opened during this
reverse movement.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
In the patent just referred to claims were allowed to a swingable
comb that could be used for any purpose. In the present case the
claims will be directed to a swingable comb used in a dishwashing
machine. Some dishwashers have an oval table for supporting a train
of dollies on which dish-carrying baskets are removably mounted.
These dollies are moved through the dishwasher where the dishes are
washed and rinsed. Hot water is used for the rinsing of the dishes
and it is necessary to open the hot water valve only when there are
dishes in the rinse compartment to be rinsed in order to conserve
on the quantity of hot water used. A comb with tines has been used
in the rinse compartment and the comb will close a magnetic switch
for opening the hot water valve when the comb is swung in one
direction by a dish-carrying basket as the dolly moves the basket
through the rinse compartment. The tines of the comb are free to be
swung in the opposite direction without effecting the closing of
the magnetic switch or damaging the tines, should it become
necessary to reverse the movement of a dolly and move it for a
short distance past the tines for any reason.
2. Description of the Prior Art
A Patent No. 2,668,548 was issued on Feb. 9, 1954 to George J.
Federighi and Tore H. Noren on a Magnetic Mechanism for Controlling
Flow of Rinse Water in a Dishwashing Machine. This patent discloses
a dish-carrying basket movable through a dishwashing compartment
and one or more dish-rinsing compartments. A mercury switch is
mounted outside of the dishwasher and a trip is mounted within the
machine and is actuated by a dish-carrying basket and carries a
magnet for controlling the opening and closing of the switch. When
the trip is in normal position, a magnet is disposed close to the
mercury switch for holding the switch open. An electrically
operated rinse water valve is connected to the switch and remains
closed so long as the switch remains open.
It is vital that the final rinse water be turned on only when the
dishes are in a position to be given a final rinse in order to save
on the quantity of hot water used. The dish basket will actuate the
trip for closing the switch that opens the hot water valve so that
the dishes can be rinsed.
Another Pat. No. 2,864,387 was issued on Dec. 16, 1958 to the same
two above-mentioned patentees and it pertains to a Dishwashing
Machine with Automatic Final Rinse Control. An endless conveyor is
disclosed in this patent for conveying dishes through the
dishwasher rather than using dollies for supporting dish-carrying
baskets. A comb with tines is placed in the rinse compartment and
any dishes being carried by the upper reach of the endless conveyor
will strike one or more tines and swing the comb in one direction
for causing the latter to close a mercury switch and open a valve
controlling the flow of hot water into the rinse compartment. No
mechanism is shown in this patent for permitting the tines to swing
in the opposite direction because there was no need for this since
the upper reach of the endless dish-carrying conveyor travelled in
only one direction for conveying the dishes through the dishwasher
including the rinse compartment.
SUMMARY OF THE INVENTION
An object of my invention is to provide a comb in the rinsing
compartment of a dishwasher that will be swung in one direction for
opening the valve for the hot water when the comb tines are
contacted by a dish-carrying basket as it is moved by its
supporting dolly through the rinse compartment. A train of dollies
is mounted for movement along an oval table that will successively
move the dollies one at a time into the dishwasher and through the
rinse compartment. The tines are so mounted on the comb that they
are free to swing in an opposite direction should it become
necessary to move the dollies and dish-carrying baskets in a
reverse direction through the rinse compartment. Each tine is
removably secured to the comb and it may be readily replaced by a
new tine in case it becomes damaged.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top plan view of an oval table adapted to feed a train
of dish-carrying dollies through a dishwashing machine. The train
of dollies and the endless track for supporting the dollies are not
shown in this figure.
FIG. 2 is an enlarged transverse section through the final rinse
compartment of the dishwasher and is taken substantially along the
line 2--2 of FIG. 1. A comb is illustrated in this figure as having
tines that lie in the path of the moving dish-carrying baskets so
as to be actuated thereby for swinging the comb to close an
electric switch that will open the rinse water valve for rinsing
the dishes. A dolly and a dish-carrying basket are shown in this
figure.
FIG. 3 is a longitudinal section through the final rinse
compartment of the dishwasher and is taken substantially along the
line 3--of FIG. 2.
FIG. 4 is an enlarged transverse section through a portion of the
comb that controls the opening of the hot water valve for the final
rinsing of the dishes. It is taken along the line 4--4 of FIG. 2
when looking from the right hand side of the FIG. 2. This is
looking from the opposite direction to that of FIG. 3 where one is
looking from the left hand side of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In carrying out my invention I make use of a dishwashing machine
that is schematically shown in a top plan view in FIG. 1, and it
includes a power wash compartment A, a power rinse compartment B
and a final rinse compartment C. I do not wish to be confined to
any particular type of dishwasher and it is not vital to the
invention that the dishwasher be provided with both a power rinse
and a final rinse compartment. All that is necessary is that my
invention be placed to control the flow of hot water in the final
rinse so that the hot rinse water is turned on only when there are
dishes in the compartment to be rinsed.
An oval table D is associated with the dishwasher and it is
preferably made in sections as shown in FIG. 1 of my Patent No.
3,447,491, issued June 3, 1969, and entitled Sectional Oval-Shaped
Table for Endless Conveyor for Dishwasher; and in my Patent No.
3,511,192, issued May 12, 1970, on a Sectional Oval-Shaped Table
with Side Walls and U-Shaped Tongues Interconnecting Adjacent
Sections. The sectional oval table D is provided with an endless
pair of dolly guiding rails, not shown in FIG. 1, but shown in
transverse cross section at E and F in FIG. 2. In the enlarged
longitudinal section through the final rinse compartment C, see
FIG. 3, I show one of the dolly guide rails F. Each guide rail is
provided with a longitudinally extending groove in which
dolly-supporting wheels 1 and 2 ride. These wheels support a dolly,
shown by dot-dash lines at G in FIG. 2, and the dolly carries a
dish-retaining basket H, also indicated by dot-dash lines. The
particular type of dolly that is preferably used is shown in my
Patent No. 3,550,755, issued Dec. 29, 1970, on an Endless Conveyor
for a Dishwasher with Links Interconnection Adjacent Dollies. I do
not wish, however, to be confined to any particular type of dolly
or dish-carrying basket. Any means may be used for moving the
basket H through the final rinse compartment C and my invention
pertains to a novel type of comb that will be contacted and swung
by the moving basket and the swinging of the comb will close the
electric switch which will open the hot water valve and direct
rinse water against the dishes for rinsing them.
In FIGS. 2 and 3, I show a comb, indicated generally at J, as being
mounted in the final rinse compartment C of the dishwasher. The
comb consists of a number of tines 3, see also FIG. 4, that are
mounted in tubular supports 4. The latter are welded or otherwise
secured to sleeve 5 which in turn are rotatably mounted in abutting
relation on a transversely extending shaft 6. The ends of the shaft
6 are received in bearings 7 which in turn are secured to the side
walls 8 of the final rinse compartment C. Each tine 3 has its upper
end projecting above its tubular support 4 and a cotter pin 9 is
inserted through an opening in the tine and it rests on the top of
the support for removably supporting the tine. The lower portion of
the tine that is contacted by the basket H may be provided with a
plastic or rubber sleeve 10 that will protect the tine. If any tine
becomes damaged it is a simple matter to remove its cotter pin 9
and slip the tine out of its tubular support 4 and then substitute
a new tine for the damaged one.
I will now describe how the swinging of the tines 3 by a moving
basket H will actuate a mechanism for closing a switch that will
open a hot water valve. Both FIGS. 2 and 4 show the shaft 6
provided with a pair of arms K that are keyed to the shaft so that
a swinging of the arms will rock the shaft. A transversely
extending bar L is connected to the two arms K by threaded shanks
11 that extend through the bar and have their other ends connected
to the arms. It is possible to adjust the bar L toward or away from
the arms K by adjusting the nuts 12 and 13 on the threaded shanks
11, these nuts being placed on opposite sides of the bar as is
clearly shown in FIG. 4. A lock nut 14, also mounted on each
threaded shank 11, aids in securing the shanks to the arms K. The
bar L can be adjusted on the threaded shanks 11 so that the weight
of the bar will counterbalance the weight of the tines 3 and
sleeves 4.
It will be noted from FIG. 4 that the arms K, threaded shanks 11
and bar L extend off at an angle from the axis of the shaft 6
instead of depending vertically in a downward direction from the
shaft. This is due to the fact that the weight of the arms K,
threaded shanks 11 and bar L is counterbalanced not only by the
tines 3 and sleeves 4, but also by an arm M that is keyed to the
shaft 6 and extends vertically above the shaft and carries a
threaded horizontal shank 15 that projects on the opposite side of
the shaft from that of the bar L. A magnet holding casing N is
mounted at the outer end of the shank 15 and it contains a
horseshoe magnet, shown by dotted lines P in FIG. 2. The casing N
is held in adjusted position on the shank 15 by nuts 16 and 17 and
a lock nut 18 secures the shank in the arm M, see FIG. 4.
It is important that the magnet holding casing N and the magnet P
be positioned near to the top wall 19 of the final rinse
compartment C when the magnet is in normal position, see FIG. 3.
The reason for this is so that the magnet can act on a magnetizable
arm 20 of an electric switch Q to hold this arm out of contact with
the other stationary arm 21 of the switch and thus normally hold
the switch in open position. The bar L can be adjusted on the
threaded shanks 11 so as to cause the bar to be disposed to the
left of the shaft 6, as shown in FIG. 3, and the magnet P will be
disposed to the right of the shaft and positioned under the switch
Q to maintain it in open position. When the bar L is in this
position and if there is no basket H of dishes moving through the
final rinse compartment C, the tines 3 will hang straight down and
will lie in a vertical plane as shown by the fully line position of
the tines.
In FIG. 3, I show a dolly G with a dish-containing basket H moving
from the right to the left. The basket H will strike the tines 3 of
the comb J and swing them in a clockwise direction about the shaft
6 as a center. The sleeves 5 will freely rotate on the shaft 6 as
the tines 3 are swung by the basket H contacting therewith. The
swinging tines will have no effect on moving the transverse bar L
until they actually strike the bar as is clearly shown by dot-dash
lines in FIG. 3. When this takes place, the bar L will be swung
from its full to its dot-dash line position and the magnet P and
its housing N will be moved away from the electric switch Q. The
magnetizable switch arm 20 will be freed from its magnetic
attraction to the magnet P and it will swing to contact with the
stationary switch arm 21 and close an electric circuit to open a
solenoid controlled valve R, see FIG. 3. A main switch 22' has
already been closed which will connect the solenoid valve R to a
current source, not shown, when the switch Q is closed.
Again referring to FIGS. 2 and 3, it will be seen that the hot
water pipe S leads to a spray head T in the final rinse
compartment, and this spray head has outlet spray nozzles 22.
Dot-dash lines 23 indicate how the hot rinse water will be sprayed
onto the dishes only when a basket H of dishes is actually moving
through the rinse compartment. As soon as the dish basket H clears
the tines 3 of the comb J, the tines will swing back into a
vertical depending position and will free the bar L so that its
weight will swing it from the dot-dash line position of FIG. 3 back
into the full line position in the same Figure. This will swing the
magnet P and its housing N in a counter-clockwise direction from
the dot-dash to the full line position. The magnet P will again
attract the magnetizable arm 20 of the switch Q to open it and
permit the spring-biased solenoid valve R to close and stop any
further flow of hot rinse water from the spray head T.
One important feature of the invention is the free swinging of the
tines 3 in a counter-clockwise direction when looking at FIG. 3,
should it become necessary to move the dolly G and basket H in a
reverse direction, i.e. from the left to the right in this Figure.
The tines 3 will not be damaged through such swinging movement and
they will not contact with the bar L during such a
counter-clockwise movement. FIG. 3 shows by dot-dash lines how the
tines 3 of the comb J are free to swing to the right from the full
line position should it become necessary to reverse the direction
of movement of the dolly G and basket H, which will cause the right
hand edge of the basket to contact and swing the tines. In this
manner the tines 3 will not be damaged nor will the shank 15 and
the magnet P be moved when it becomes necessary to move the basket
H in a relative direction for any reason.
* * * * *