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Патент USA US3034009

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May 8, 1962
J. M. THORNBERY ETAL
3,033,999
TIMER AND TIMER POSITIONING MEANS
Filed March 16, 1959
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INVENTO
JAMES W-THORNBERY
BY DALE. F.W\\_\_cox
ATTORNEY
May 8, 1962
J. M. THORNBERY ETAL
3,033,999
TIMER AND TIMER POSITIONING MEANS
Filed March 16, 1959
5 Sheets-Sheet 2
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JAMES W. THQRNBERY
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JNVENTORS
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May 8, 1962
J. M. THORNBERY ETAL
3,033,999
TIMER AND TIMER POSITIONING MEANS
Filed March 16, 1959
5 Sheets-Sheet 3
IN VEN TORS
JAMES W. Tuoausaav
F. W|u.cox
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BY DALE ATTORNEY
I May 8, 1962
J. M. THORNBE‘RY ETAL
3,033,999
TIMER AND TIMER POSITIONING MEANS
Filed March 16, 1959
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INVENTORS
JAMES M. THORNBERY
DALI F1 \AhLLcox
BY
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ATTOR N E\(
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3,633,999
Fatented May 8, 1952
2
distinct from the board, is provided and so connected that
3,033,999
Tilt/HER AND TIMER PUSH‘IUNWG MEANS
James M. Thornbery, Morton Grove, and Dale F. Will
cox, Aurora, lll., assignors to Controls Company of
America, Schiller Park, ill, a corporation of Delaware
Filed Mar. 16, 1959, Ser. No. 799,781
21 Claims. (Cl. 307-1414)
This invention relates to sequential timers and par
ticularly to the rapid and accurate positioning of the
timer at a desired starting point. While the following
description is directed primarily to such a timer as used
in the appliance industry, the use of the invention is not
limited to this ?eld.
‘
it will not open until the timer has reached a position
which is desired to be tested. In this way, all switching
on the circuit board is avoided. This switch can be elimi—
nated in many cases including the present situation but
has been shown as an optional feature.
During the high speed driving of the timer to the
desired starting point, there will, of course, be high speed
rotating masses in the systems and upon the seeking cir
cuit indicating the desired position has been reached,
these masses would tend to continue the rotation of the
timer and this could result in the timer going past the
desired starting point. Another object of the invention,
therefore, is to provide a high speed drive for positioning
Sequence timers of this type are generally of a rotary 15
the timer and in which the rotating mass is rapidly re
nature and aiford program possibilities within 360° of
moved from the system upon reaching the desired point
rotation. For various reasons, the timers are usually
so that the inertia of the mass cannot result in over
driven through a stepping mechanism wherein the ro
stepping the starting point.
tating parts steps a predetermined number of degrees at
predetermined intervals. The usual practice provides for 20 Other objects and advantages will be pointed out in,
or be apparent from, the speci?cation and claims, as will
50 or 60 intervals in the 360° of rotation available. The
obvious modi?cations of the single embodiment shown
present invention, however, is not limited to any par
in the drawings, in which:
ticular number of intervals nor, in fact, is it limited to a
stepping type timer. As will appear more fully herein
after, the fundamental concepts are applicable to con
tinuous or creep timers as well as a stepping timer. Simi
larly, the fundamental concept would be applicable to
the so-called linear timer. Now then, in the linear or
peripheral distance of the timer, it is necessary to pro
vide the desired sequences. A provision of the desired
sequences for appliances has, in the past, been rather
simple but as the appliance industry progresses and learns
more about the various conditions conducive to superior
results or requires programs for combination washers
and dryers it has become necessary to provide for more
and more programs within the limited space available. In
the old practice, the programs could be well separated
FIGURE 1 is a top View with parts broken away show
ing the general arrangement of the timer;
FIGURE 2 is a back View of FiGU‘iE 1 showing the
timer slow speed stepping mechanism;
FIGURE 3 is a front view of the timer of FIGURE 1
and shows the high speed drive mechanism;
FiGURE 4 is a view taken as indicated by line 4-4
on FIGURE 1;
FiGURE 5 shows the shaded pole motor in its de-ener
gized position where it is disengaged from the stepping
mechanism;
FIGURE 6 shows the shaded pole motor energized and
engaged with the drive for the high speed stepping of
the timer;
FIGURE 7 is a more detailed view of the interval timer
cam bank, the precise details of which are not of import
ance here;
however, the programs must be closely spaced and, in 40 FIGURE 8 shows a spray switch and is a section taken
fact, very often afford no more than one interval (6° or
on line S~3 in FIGURE 1;
7.2“) between programs. This being the case, it .be
FIGURE 9 is a further detail of the interval timer cam
comes a much greater problem to insure the proper posi
bank and the switches operated thereby;
within the space and it was a simple matter for the user
of the appliance to select the desired sequence.
Now,
tioning or" the timer at the correct starting point for the
desired program. This positioning can be accomplished
manually either with mechanical or electro-mechanical
aids or can be eifectcd automatically as in the present
case.
The principal object of this invention is to provide for
automatic rapid positioning of a sequence timer at a
desired starting point.
We provide a timer having the usual drive motor
and another motor for rotating the timer a‘ ' igh speed
to the desired starting point.
During the high speed
FIGURE 10 is a diagrammatic representation of the
system employed here in the seeking circuit for proper
positioning of the timer;
FIGURE 11 is a wiring diagram from a representative
circuit adding to the system of FIGURE 10 certain of
other features and more in accordance with the type of
printed circuit utilized in the embodiment illustrated;
and
FIGURE 12 is a showing of a sample control panel
utilizing rocker type switches and forming a companion
to the circuit of FIGURE 11.
drive of the timer to the proper starting point, the cir
Referring to the drawings now in detail, the timer in
cuits controlled by the timer would normally tend to
cludes the basic interval timer wherein the motor It)
make and break in the rapid sequence.
drives cam 12 in a clockwise direction (FIGURE 2) to
t is another object of this invention to prevent the
act
on follower 14 to rock link 16 in a counter-clockwise
operation of the circuits controlled by the timer during
direction about its pivot 18 and against the bias of spring
rapid advance of the timer. In carrying out this object, 60 29.
This type of ‘action is well known in the ‘art and
we provide for complete de-energization of the timer and
serves to gradually build up energy in the spring 20 with
the circuits controlled thereby during the positioning of
out requiring a high torque motor. When the follower
the timer.
reaches the cam drop portion 22, the stored energy in
As an aid to locating the proper starting point, pro
spring 20 is released rapidly and the link 16 rapidly ro
vision is made for a seeking circuit including a printed
tates
in ‘a clockwise direction. During the counter
circuit. The seeking circuit must be tested periodically
clockwise rocking of the link, the feed pawl 24 is moved
to determine if the proper starting point has been reached
back one tooth on ratchet 26 while being retained in
and this normally contemplates switching on the circuit
engagement with the periphery of the ratchet by means
board. Under some circumstances it is desirable to avoid
switching on the board. Another object of this inven 70 of pawl biasing spring 28. Now then, when the energy
is released rapidly the feel paw'ls serves to index the
tion, therefore, is to avoid switching on the printed cir
ratchet forward one step. Any tendency of the ratchet
cuit board and to accomplish this end, a separate switch,
to follow the pawl in its withdrawing or backstepping
seasons
3
action is prevented by the spring loaded anti-‘back up
pawl so acting on the ratchet. In this manner, during
energization of the timer motor 10 the timer arbor 32
pivotally mounted between the frame members 34, so is
rotated in a step-by-step manner. This type of operation
is common in the timer art, although the various feed
it
so as to eliminate any possibility of the inertia of the
shaded pole motor continuing the drive past the desired
point. When the rotor drops down, the switch 52 oper
ated by the rotor is also restored to its normal condition.
This, incidentally, serves to energize the main timer motor
in to go through the selected cycle. ’ It should be noted
that the main timer motor and all timer circuits have
mechanisms can vary according to manufacturer.
been de-energized during the high speed indexing of the
It will be noted (FIGURE 8) that the cam 12 is pro
timer to the desired starting point.
vided with small face cams 38 which serve to operate
Reference has been made to a seeking circuit. This
the spray switch 4-0 in the usual manner. Further de 10
includes the wiper or brush 86 carried on the backside
tails or descriptions in this direction is not considered
of ratchet 8d and, hence, rotatable with the arbor at all
essential since spray switches are old in the art.
times. This brush cooperates with the printed circuit
The timer arbor is provided with a plurality of cam
appearing in the right portion of ‘FIGURE 4 and includ
discs 42 which actuate the various switches 44 carried by
the terminal boards 46 on the opposite sides of the arbor. 15 ing various circuit elements projecting into the paths of
the brush to be contacted thereby. The brush in its ro
These cams serve to control the sequencing of the various
tation over the printed circuit is designed to seek a closed
appliance functions. As noted above, the desire here is
circuit. In other words, the desire is to bridge between
to provide a multiplicity of programs within the rota
brush part 88 and part 90. It will be appreciated that
tional limit of the arbor and, hence, it is necessary to
space the various programs closely and this, in turn, re 20 it is di?icult to follow the printed circuit laid out in this
manner and, hence, reference will now be made to FIG
sults in the user having to position the arbor within, say
URE 10 which gives a simpli?ed version of the seeking
6° out of 360° and this is rather accurate positioning.
circuit as well as the mechanism described thus far.
The purpose of this invention is to automatically position
In FIGURE 10, the printed circuit is shown in quite
the arbor in the right position ‘for the start of the desired
cycle. It is obvious that the user would not wish to ‘wait 25 simpli?ed form in the upper right hand portion with the
wiper ‘86 indicated as being rotatable around the printed
while the timer rotated at its normal speed to arrive at
circuit board. In connection with this timer, various
the desired starting point and, for the purpose of moving
cycle selection switches are employed. These switches
the timer to the desired starting point rapidly, a sep
have been indicated as SA, SB, SC, SD, SE which, in turn,
arate drive is provided.
connect with the printed circuit elements A, B, C, D, and
This drive is powered by the shaded pole motor 48,
1E. The selection switches are normally open and clo
the rotor so of which is axially movable as well as being
sure of one of these selection switches will establish cir
rotatable in the usual fashion. This axial motion (or
cuit sought by the present system. The switches are so
solenoid action) is utilized for operating switch 52 and
designed
that actuation of any one of the switches will
for engaging the rotor to the high speed drive mechanism.
When the coil of the shaded pole motor is energized, the 35 also momentarily close the switch M. Closure of the
switch M will establish a circuit ‘from line Ll through
rotor 5E3 will be moved vertically (FIGURES 5 to 6)
the
switch M and the contacts of the normally closed re
and with this action, the rotor shaft will rock lever 54
lay R to the coil of the shaded pole motor 48 and back
to permit the switch plunger 56 to move outwardly and
to the other side of the line L2 through lead 92. Im
lactuate the holding switch for purposes which will be
more clear hereinafter. At the same time, the other end
of the rotor shaft moves up so that the spring 58 carried
thereby and coiled about the shaft with one end pro
mediately upon energization of the shaded pole motor,
the rotor solenoid action will transfer the holding switch
52 to ‘its other contact to shunt the momentary switch
through lead 94 and maintain the circuit through the
jecting axially towards the rotor will engage with the
shaded pole motor winding. The high speed drive is now
cut-out portion in pinion do which, in turn, drives gears
62, 643 with the latter driving gear 66. Gear 66 is pro 45 established and it will also be noted that the timer mo
tor. and timer circuits have been de-energized. As the
vided with a cam 68 which will operate searching switch
wiper‘ passes around the printed circuit seeking a closed
SS (through follower 70) on each revolution of gear 66.
circuit, the searching switch SS will open on each rev
The gear 66 is also provided with 1a drive pin 72 engage
olution as above described. The searching switch nor~
ing slot ‘74 in link 76. The link is biased towards the
acts when closed to shunt the printed circuit board
right by spring ‘78 and is guided by pin 80 about which 50 mally
but
when
open will permit the printed circuit board to
it can also rotate with the pin projecting through the link
test the circuit conditions on the board. If a closed cir
slot $2. The right end of the link is adapted to engage
cuit is found, current will flow through the coil 96 of
ratchet 84 carried on the end of the other opposite the
relay R and break the relay contacts to thereby (lecher
normal feed ratchet 26. On each revolution of the gear
the shaded pole motor. De-energization of the
66 the pin will withdraw the link from ratchet 84 against 55 gize
shaded pole motor will immediately cause holding switch
the bias of spring '78. As the motion continues, the link
52 to transfer back to its original position and pass cur
will ‘be rocked about pivot 80 to start the link back to
rent to timer 1t} and it will also break the current flow to
wards the ratchet $4 so as to pick up the next tooth.
the relay to permit it to go back to its normally closed
After the link has picked up the next tooth, the continued
condition.
motion will cause the link to rock about pivot 86 in a 60
As mentioned before, the searching switch SS may, if
counter-clockwise direction and advance the ratchet 34
desired, be eliminated. The amount of current carried
one step whereupon the pin starts withdrawing the link
on the printed circuit board under the present circuit con
again ‘for the next feed operation. The cam 68 is so
ditions is very small and in most cases is of no conse
positioned that after the link has been well withdrawn
quence and, hence, the switching can be done on the board
from the ratchet 84, the searching switch SS will be 66 without the necessity of shunting the board as is'done
opened as in FIGURE 4. The purpose of the searching
with a searching switch. The searching switch under
switch will be explained more ‘fully hereinafter.
some conditions is of value where other circuit conditions
At this point suffice it to say that if the searching switch,
involving higher current loads are searched on the board.
when open, indicates in cooperation with the printed seek
70 Under these conditions the wiper can be positioned in the
ing circuit, to be described hereinfater, that the correct
position has been reached, the shaded pole motor will be
tie-energized and at this time the high speed ‘feed mech
anism is totally disengaged from the timer arbor. Upon
de-energization, the shaded pole motor rotor will drop
down and will be tie-clutched from the drive mechanism 75
test position prior to opening of the searching switch so
that the current load is carried at a switch designed to
switch such loads rather than-switching on the board.
While the present description has been devoted to a
circuit which seeks a closed condition, it is also possible
5
3,033,999
8
to seek an open circuit which also permits elimination
operative during the high speed advance to de-energize
of the relay. This is primarily a matter of choice and it
is thought necessary to show here only one type of cir
cuit. Reference may be made to co-pending application
the control switches.
2. In a timer, timing means movable over a pre
scribed path, a switch element movable with the timing
means, a ?xed switch element cooperable with the ?rst
Ser. No. 799,780, now Patent No. 2,995,143, for a de
scription of a seeking circuit which seeks an open circuit
element to determine a circuit condition, motor means
as distinct from a closed circuit.
for advancing the timing means over said prescribed
path in a step-by-step manner and in circuit with said
elements whereby the motor means is energized through
Turning now to a consideration of FIGURES 11 and
12, it will be noted that FIGURE 11 illustrates schemat
ically the operation described with respect to FIGURE 10 said elements, and switch means operated as a result of
10 but omits the more or less operational characteristics
of FIGURE 10. The seeking circuit here is slightly more
complicated but with an understanding of the circuit
shown in FIGURE 10, this circuit will be readily under
stood. Frorn line L1, there is a lead 98 leading to the 15
momentary switch M which is closed when the cycle se
lection switches are closed but is closed only momen
tarily. The momentary switch is shunted by the hold
ing switch 52 which will take over after the shaded pole
motor 48 has been energized. Switch ltltl will be open
if no fabric switch (as appearing in FIGURE 12) is actu
ated and will be closed upon actuation of a fabric push
switch. These switches are shown as F, G, H, and I in
FIGURES 11 and 12. Switch 162 is normally open and
is closed upon actuation of one of the operation Switches
J, K, L, N and 0. It will be appreciated upon inspec
tion of FIGURE 11, that, in order to establish a closed
circuit for the brush ~86 to seek it will be necessary to close
both a fabric button and an operation button and upon
actuation of the two, it will establish the proper starting
point. For example, if button F is actuated and the op
eration switch I is also actuated, the brush will stop at
interval numbered 1. On the other hand, if switch G
has been actuated instead of F, the brush will stop at in
terval 2. Thus, it will be seen that the fabric switches
and the operation switches are utilized in combination
to feed in the information whereupon the system will
establish the proper cycle to accommodate the conditions
supplied.
operation of the motor means to shunt said elements
during each step of the advance of the timing means
whereby the circuit continuity to the motor through said
elements is not determined until the step has been com
pleted.
3. A sequence timer, a plurality of control switches,
switch operating means movable over a prescribed path
for effecting various sequences of operation of the control
switches, means for indicating the position of the switch
20 operating means with respect to said path, a plurality of
position selection switches operably connected with said
indicating means and normally establishing a circuit con
dition, actuation of any of the position selection switches
being operative to indicate which of the various sequences
25 is desired and to establish an abnormal circuit condition,
an electric motor having an axially movable rotor and
operable to advance the switch operating means at high
speed, a switch momentarily operable to energize the
motor, and a holding switch operated as a result of axial
30 movement of the rotor upon energization of the motor,
said holding switch being in circuit with the position
selection switches.
4. A sequence timer, a plurality of control switches,
switch operating means movable over a prescribed path
35
for effecting various sequences of operation of the cou-v
trol switches, a motor operable to advance the switch
operating means, electrical means for indicating the posi
tion of the switch operating means with respect to said
path, a plurality of position selection switches operably
When‘ the brush ?nds the closed circuit, the relay R is 40 connected in circuit with said indicating means, actua
tion of any of the position selection switches being opera
the circuit through the shaded pole motor which, in turn,
tive to determine which of the various sequences will be
will open the holding switch 52 shunting the momentary
obtained and to establish in cooperation with said indi
switch M and will allow the holding switch in L1 to go
cating means a circuit condition affecting operation of
back to its normally closed position whereupon the timer
the
motor, and a momentary switch for initiating opera
will go into operation. The holding switch in line L1
tion of the motor.
energized to open the normally closed contacts and break
being opened during operation of the high speed drive
will result in all circuits controlled by the timer cams be
ing tie-energized and, hence, there is no wear and tear on
the components during the period the timer is being driven
to its starting point. If the timer circuits were not de
energized, the apparatus controlled by the timer circuits
would, of course, rapidly go through various functions
and this would greatly add to the wear and tear on the
5. A sequence timer, a plurality of control switches,
switch operating means movable over a prescribed path
for e?ecting various sequences of operation of the con
trol switches, an electric motor having an axially mov
able rotor and operable to advance the switch operating
means, electrical means for indicating the position of the
switch operating means with respect to said path, a
components with a subsequent shortening of the useful 55 plurality of position selection switches operably con—
nested in circuit with said indicating means, actuation
life of the components. Hence, it is considered quite de~
of any of the position selection switches being operative
sirable to de-energize the entire timer during the high
to determine which of the various sequences will be ob
speed drive. Provision is made, of course, for re-estab
tained and to establish in cooperation with said indicat
lishing the power supply to the timer after the timer has
ing means a circuit condition affecting operation of the
been stopped at a predetermined interval which is the start 60 electric motor, a momentary switch for initiating opera
of a cycle.
tion of the motor, and a holding switch operated as a
Although but one embodiment of the present invention
result of axial movement of the rotor upon energization
has been illustrated and described, it will be apparent to
of the motor and being in circuit with the position selec
those skilled in the art that various changes and modi?
tion switches and the indicating means to maintain ener
cations may be made therein without departing from the 65 gization of the motor until the circuit condition estab
spirit of the invention or from the scope of the appended
lished by actuation of a position selection switch is
claims.
obtained.
We claim:
6. A sequence timer comprising, a plurality of control
1. A timer comprising cam means movable over a pre
switches, switch operating means having a number of
70
determined path, control switches operated by the cam
starting points, means for selecting a desired starting
means, means for advancing the cam means at timing
point, a ?rst motor for driving the switch operating
speed to effect sequential operation of the switches over
means at a timing speed, a second motor operable to
a portion of said path, said switches being operated dur
drive the switch operating means at high speed to the
ing high speed advance or“ the cam means, and means 75 desired starting point, means for energizing the second
8,933,999
g
fl
motor, and means preventing energization of the ?rst
motor during operation of the second motor.
the rotor to de-energize the control switches during op
eration of the second motor.
7. A sequence timer according to claim 6 in which
15. A timer according to claim 14 in ‘which the cam
the second motor includes a rotor having a solenoid
means has a rotary motion and is carried in a frame, a
action when the motor is energized and the preventing
means is operated by the said rotor.
wiper brush rotating with the cam means, circuit elements
carried by the frame to be contacted ‘by the ‘wiper, se
lection switches in circuit with the circuit elements, said
switches cooperating with the circuit elements to estab
8. A sequence timer according to claim 7 in which
the preventing means is a switch in circuit with the ?rst
lish a circuit condition said second motor being de-ener
9. A sequence timer according to claim 8 including 10 gized when the wiper senses the circuit condition.
16. A timer according to claim 15 in which the cam
clutch means between the second motor and the switch
motor.
operating means, said clutch means being operated by
means is driven step-by-step by 'both motors, and search
switch means operative to shunt said circuit elements
during each step and to open the shunt after each step.
17. A timer according to claim 16 in which the search
circuits controlled by the switches, said circuits being 15
switch is operated by a cam driven by the second motor.
de-energized by said preventing means during operation
18. A timer comprising sequence control means, con
of the second motor.
trol circuits operated by the sequence means, means ‘for
11. A sequence timer according to claim 6 wherein
advancing the sequence means at timing speed, means
said selecting means includes first circuit elements moving
for advancing the sequence means at high speed and
with the switch operating means, second circuit elements
means operative during the high speed advance to ‘dc-en
?xed against movement and cooperating with the ?rst
ergize the control circuits.
circuit elements to indicate the position of the switch
19. A sequence timer having a plurality of starting
operating means, a plurality of position selection switches
points, slow speed drive means for the timer means for
in circuit with the ?rst and second circuit elements and
the solenoid action of the rotor.
10. A sequence timer according to claim 6 including
normally establishing a circuit condition, actuation of the
position selection switches being operative to establish
selecting one of said starting points, high speed drive
means ‘for the timer, and means responsive to energize
tion of the high speed drive means to de-energize the
an abnormal circuit condition indicative of the desired
circuits controlled by the timer.
~
position, and means responsive to the abnormal condition
20. A timer according to claim 19 including means
being reached to de-energize the second motor.
12. A sequence timer according to claim 11 in which 30 responsive to positioning the timer at a pre-determined
starting point for ide'energizing the high speed timer.
the second motor is a shaded pole motor the rotor of
21. A timer according to claim 20 including means
which has a solenoid action, said preventing means being
responsive
to de-energization of the high speed means to
a switch operated by the rotor and in the line to the ?rst
energize the slow speed drive means.
motor and the circuits controlled by the timer switches.
13. A sequence timer according to claim 12 including 00 U!
a searching switch in parallel with and normally shunt
ing said ?rst and second circuit elements and the selec
tion switches, and means ‘driven ‘by the second motor
for periodically opening the searching switch.
14. A sequence timer including a plurality of control 40
switches, cam means ‘for operating the switches, a ?rst
motor for driving the cam means at timing speed, a sec
ond motor including a rotor having a solenoid action,
clutch means operated by the rotor for engaging the sec
ond motor and the cam means so the second motor can
drive the cam means at high speed, a switch operated ‘by
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,921,740
2,391,718
2,421,481
2,608,252
2,805,331
2,863,996
2,898,993
3,011,079
Foote _______________ __ Aug. 8,
Lindemann __________ __ Dec. 25,
Collins ______________ __ June 3,
Candor ____________ __ Aug. 26,
Wo?ord ____________ .__ Sept. 3,
Hill et al. ____________ __ Dec. 9,
Huff ________________ __ Aug. 11,
Mellinger ____________ __ Nov. 28,
1933
1945
1947
1952
1957
1958
1959
1961
Disclaimer
3,033,999.—James M. Thombery, Morton Grove, and Dale F. Wz'ZZcom, Aurora,
Ill. TIMER AND TIMER POSITIONING MEANS. Patent dated
May 8, 1962. Disclaimer ?led Feb. 24, 1969, by the assignee, Controls
Company of America.
Hereby enters this disclaimer to claims 1 and 18 through 21 of said patent.
[O?icz'al Gazette May 27, 1.969.]
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