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Патент USA US2117768

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May 17, 1938.
2,117,768
A. G. MCNICIOLL
CLOCK THERMOSTAT
Filed April 1, 1935
3 Sheets-Sheet l
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May 17, 1938.
A. G. McNlCOLL
2,117,768
CLOCK THERMOSTAT
Filed April 1, 1935
3 Sheets-Sheet 2
IN VEN 70!?
Andrew
. McNicoZZ/
BY HIS A TTORNEY
M83’ 17, 1938.
A. G. McNlCOLL
2,117,768
CLOCK THERMOSTAT
Filed April 1, 1935
3 Sheets-Sheet 3
‘ INVEN TO}?
Andrew ('ZMGJVZ'G'GZZ
BY H/S ATTORNEY
Patented May 17, 1938
2,117,768
UNITED STATES PATENT OFFICE
2,117,768
CLOCK THERMOSTAT
Andrew G. McNicoll, Minneapolis, Minn., assign»
or to Minneapolis-Honeywell Regulator Com”
pany, Minneapolis, Minn” a corporation of
Delaware
Application April 1, 1935, Serial No. 14,063‘.
13 Claims.
This invention relates to clock thermostats.
As is known in the art, there is a time lag be
tween the time the heating system is placed in
operation and the time at which the room tem
perature is brought ‘up to the desired level. Be
cause oi this time lag, the heating system will
deliver heat to the room or space to be heated
for some time after the room thermostat has be
come satis?ed. This is especially true during
morning pick-up periods under the command of
a clock thermostat. Under these conditions, the
temperature of the room is low and the tempera
ture of the heating system is low. When the
room thermostat is shifted by its clock mecha
ated by the cam means for controlling the clutch
ing means to adjust the thermostat in one direc
tion at a predetermined time, to adjust partially
the thermostat in the other direction at another
nism from the night setting to the day setting,
the heating system will be energized to deliver
heat to the room. However, the heating system
predetermined time, and to adjust completely the 15
thermostat in the second direction at still another
will build up a surplus of heat and when the
room has been brought up to the proper tempera
ture and the heating system shut down, this sur
plus of heat will be delivered to the room to raise
the temperature of the room beyond the desired
level, causing what is known in the art as "over
shooting”.
25
Broadly, it is therefore an object of this in
vention to prevent “over-shooting” of the tem
perature of the room during morning pick-up.
This is accomplished in applicant’s invention by
providing a two-stage morning pick-up whereby
30 the thermostat setting is raised to an interme
2.;
for adjusting the setting of a thermostat which
time mechanism includes means for adjusting the
thermostat in one direction in a single step and
in the other direction in a plurality of steps.
Still more speci?cally, it is an object of this 5
invention to provide in combination with an ad
justable thermostat, a constantly driven shaft,
cam means driven by the shaft, adjusting means
for the thermostat, clutch means between the
shaft and the adjusting means, and means actu 10
predetermined time.
Another object is to provide manual means for
adjusting the setting of a clock thermostat of
the type specified above wherein the automatic
setting means in no way interferes with the man
20
ual adjusting means.
Other objects and advantages will become ap
parent to those skilled in the art by reference to
the accompanying
drawings in which:
speci?cation,
claims and
25
Fig. 1 is a front elevational view of the clock
thermostat of my invention with the cover there
of removed.
Fig. 2 is an irregular vertical sectional view
diate point for a predetermined length of time to
permit the heating system to expend its surplus
heat during this predetermined time at this in
through the clock thermostat looking from the 30
right in Fig. 1.
termediate temperature level.
enlarged scale of a portion of the control mech
anism of my invention.
35
Fig. '4 is a plan view of the structure shown in
Fig. 3 with certain parts shown in section for pur
poses of clearness.
The heat so ex
pended by the system is usually sumcient to
bring the room temperature up to normal. If
this surplus of heat delivered to the room is not
su?icient to bring the temperature of the room up
to normal, then a subsequent operation of the
Ill) clock thermostat causes energization of the heat
ing system to bring the room temperature up to
normal. In other words, this invention permits
the use of the surplus of heat in the heating sys
tem for bringing the room or space to be heated
45 up to the desired temperature and to prevent this
surplus of heat from causing “over-shooting”.
More speci?cally, it is an object of this inven
tion to combine a time means with an adjustable
thermostat ‘for adjusting the setting of the ther
o mostat by lowering the setting of the thermostat
- at night and for raising partially the setting of
the thermostat at one time in the morning and
Fig. 3 is a vertical sectional view drawn to an
Fig. 5 is a rear elevational view of a portion of
the control mechanism of this invention with 40
parts broken away for purposes of clearness.
Fig. 6 is an exploded perspective view of the
fundamental parts of my clock thermostat to
clearly show the features of this invention.
Figs. 7, 8 and 9 are diagrammatic views show 45
ing various parts of the clock thermostat in
their relative positions for various adjustments.
This invention is an improvement over my co
pendingapplication S. N. 595,460, ?led February
27th, 1932 and to fully disclose the features of 50
this invention some of the structure in that ap
plication will be brie?y referred to herein. The
for raising completely the setting of the thermo . clock thermostat proper is assembled on a base
stat at a subsequent time in the momlng.
In. Extending forwardly from the bottom of the
55
Another object is to provide a time mechanism base 10 is a bracket ll upon which are located
Ci
63)
w
(Jgu ..
temperature indications U2. The bracket Ill car
ries an insulating member [13 to which is pivoted a
bracket M5 by means or a combined screw and
binding post iii. ‘The bracket is adjustably'
po
rn
of the
sitioned with respect to the insulation
braclr. t 92 by means of an eccentric adjusting
screw
worlnng in a slot in the bracket l5. Rig
do
within the casing
in turn operates the minute
and hour hands 5d and Elli respectively which
hands cooperate with time indications located on
the cloclr. face
The gear train within the casing 53 also on
idly secured to the bracket i5 is a thermostatic
element ill and rigidly connected to the therrno=
are switch arms l8 and i9.
Ml static element
Pivotally mounted on the front of the base ‘ill
by‘ means of a pivot 2i is a plate 2b. This plate
Ql'i carries biz ding posts 22 and
the binding
‘cost 523 having a portion 2K1 insulated therefrom.
therewith a pinion 58 which meshes with gear
59. The gear 59 is rigidly secured to a shaft (it.
By reason of the above described gear reduction
train, the shaft G6 is driven in such a manner
that it makes one complete revolution during
every twenty-four hours. Secured tothe twenty
iour horn‘ shaft (it is a dial disc (5i. Adjustably
ulated portion 24'} is electrically connected
15
‘ e post 22 by means of a bridge
Ad~
"~ contacts 26 and ill are carried by the
23
the insulated portion “20. "v lres connect ti e
post l@ the post
and the
_-
*cost
,
c2 to a terminal block 28 located on the rear
o, eration and construction of the thermo
c switch disclosed above is identical to
—t
the'tnostatic switch disclosed in *ny co“
1 animation and a further descrio" on is
cred necessary it being sunicient t r.
. t u“
mounted on the shaft
are carn levers 62 and
which are held in fixed position after adjust~
inent
means of a knurled nut 60.
inc cam
lever
has cam surface which projects beyond
the periphery of dial disc 6i and the cam lever
33 has two cam su. aces ltd and ‘ill projecting
beyond the periohery of the dial disc 65 for a
out more fully hereafter.
ourrsose to be poi ted
'
lvi'ounted between the spaced plates fill and {El
the
is a plate
third Oil has
mounted for
opening
Eefe
therein.
to Figs. whicl'i
2 and is
a sleeve 66.
-tegrally
"
end of the sle
.
a decrease in temperature as o
5i
a
for
'
‘ rich is journa
the thermostatic element lit, the switcn
arms l8 and i9 will be moved sequentially into
with contacts 26 and 271' respectively
in the plate Cl and at the other *
sleeve 66. The gear
is rigidly secured to "
conending
to complete application.
electrical circuits
"Uponas an
described
increase
tat'lon on the sleeve 66 is a clutch collar
temperature, the switch arrns l8 and
will be
moved out
engagement with the contacts 26
2i by the'therrnostatic element ill to breal;
the electrical circuits.
The era l: 32
rigidly secured to a
rod 33 which is suitably journalled in the base
iii
at 8C and
Mounted against rotation on
the lower end of the rod
is a lever 36 having a
pointer 37] thereon to cooperate with the tern“
e indications ill on the bracket ll.
uovlng
lever 36, the plate 26 is moved
its pivot M by the above describe struc-ii
ture to move the contacts
and 2V to
or
away from the switch arms 08 and i9. When the
lever 36
shown in
gear ill for rotati n therewith.
llilouhteol for '
‘‘
hav
ing annular groove lit) located in the periphery
thereof. Loosely mounted on the plate 6E3 by
means of
screw
is a lever l (1, having tongues '
l3 adapted to ride in the groove lid of the clutch
.
The plate 2i) has a prongeol portion Bil punched
rearwardly therefrom and located between the
prongs oi this portion is a pin 36 carried by a
cranl';
(272
crates a gear til which has secured for rotation
moved to the right of the position
l, the contacts 26 and 2? are moved
‘forwardly
collar 69. extending
Il/l’ounted pins
in thelid clutch
which COHELJ.
are adapted
to
andextend
when the
through
clutchholes
collar‘iiiis in
moved
the earn
into engage
disc
ment with the cam disc ill, the pins ‘it are ad
' “
ed to Zoroject forwardly into openings ‘E6 in oft?
A spring l-‘il, shown to be a coil spring
ini -0. 6 for purposes of ilhntration,
located lee
tween the pla’w G5 and title lever ‘ll nonnally to
to cause the pins ‘ill to register with the opening
716
the gear
Mounted on the sleeve ill‘: on.
the opposite side of plate
by means of a so
T
'09 is a
l8 so that when the pins ‘M est-end
towarl the switch arms is and ill to increase
into the opening ‘56 of the gear till the
will be moved by the gear 58.
the temperature setting of the thermostat. lvlov~
the lever 80 toward the left from the posi»
surfaces, A, 3 and (I) which are adapted to en“
tion shown
m
1, the contacts 26 and El are
55 moved away rrorn the switch arms l8 and lg to
lower the temperature setting of the thermostat.
The electric clock mechanism is secured to
spaced plates to and Ill, the plates being held in
spaced relation by means of spacers d2. idle
60 cloclr mechanism is removably secured to the
base it] in the manner pointed out in my copend
ing
and application.
ill is a synchronous
ll/lounted'between
motor 1'13 the
which
plates
drives
a motor pinion {ii}. A ‘fibre gear t5 mounted ‘upon
a shaft 1% meshes with the motor pinion it. The
other end of the shaft rill carries a pinion I'll
which is in mesh with a gear Q8. The gear 158 has
integrally secured therewith a pinion 49 which
70 meshes with a gear 50. The gear 50 is rigidly
secured to pinion 5| which in turn meshes with
‘gear 52. The gear 52 ls-mounted on a shaft
which passes through the plate M into a casing
53 for operating a further gear reduction mech
65
anism therein. The gear reduction mechanism
(it. b
urge the clutch collar 69 to its '9 rward position
‘it;
T” e earn disc "“
on is provided with three cam
gage a prong .99 on the lever ll to move the lever
l’? rearwardly against the action of the spring ‘it.
Such rearward movement causes the pins lit oi"
the clutch collar 69 to disengage from. the onen~
ings it‘; in the gear Elli) whereby rotational movemerit of the cam disc ill and the cam lid is pro-1 (50
vented.
‘When the cam surfaces A,
or C are
moved out of engagement with the prong 99 oi’
the lever ll, the spring ‘it’ causes the pins ‘M to
enter the openings “it of the gear 5d to impart
rotational movement to cam disc 6i and the
cam ‘iii.
A night abutment member 80 is pivotally
mounted by means of pin 8| to ‘the upper ex
tremity of the plate 20. The abutment 80 is
adjusted about its pivot by means of pointer 82 70
extending across the plate 20 and the amount
of adjustment is visually indicated by the coac
tion of the pointer 82 with suitable night indica
tions located on the plate 20. A morning pick-up
or day abutment member 83 is pivoted to the
3
2,117,768
plate 29 by means of a screw 84.
The abutment
member 93 is adjustably positioned by means of
a pin 99 working in a slot 96 in the abutment
member 83. The pin 95 is secured to the lever
CI 91 which is pivoted to the plate 29 as at 99.
The lever 91 extends across the plate 29 and is
provided with a pointer 99 which coacts with
suitable day indications on the plate 29 to deter
mine the adjusted position of the day abutment
H) member 83. The abutment member 83 is pro
vided with two spaced portions 99 and 9|. The
abutment member 89 and the spaced portions
99 and 9| are adapted under predetermined con
ditions to be engaged by the cam 18 to move
' the plate 29 and consequently change the set
ting of the thermostat as pointed out above.
Extending through and pivotally mounted to
the plate 4| by means of a pin’ 93 is an actuat
ing lever 92.
Extending downwardly from ‘the
20 actuating lever 92 is an abutment 94 which en
gages the front surface of the plate 4| to limit
. downward movement of the forward end of ‘the
lever 92. Pivotally mounted to the rear end of
lever 92 by means of a pivot pin 95 is an upwardly
extending member 99 which has an inwardly
extending projection 91 which is adapted to ride
against the rear face of the cam disc 61. The
member 99 is'held against the rear surface of
cam disc 61 and in an upper position by means
30 of spring 98 secured to the plate 4|.
The lug
99 of the lever 1| is located in a plane immedi
ately below the plane occupied by the portion
91 of the member 96.
Assume the parts in the positions shown in
35 Figs. 1 and 7, counter-clockwise movement of the
dial disc 9| will cause the lever 92 to ride up
the cam surface of the cam lever 62 to cause
the lever 92 to cause another cycle of operation.
similar to that outlined immediately above. This
general mode of operation is fully disclosed in
my copending application and a further descrip»
tion is not here considered necessary.
berAsorpointed
the morning
out above,
pick-up
the day
member
abutment
83
vided with two abutment surfaces 99
pro?‘
9i,
that the cam disc 91 is provided with three 9
surfaces A, B and C and that the cam lev
is provided with two‘ cam surfaces I99 and =
It should be noted at this point that the
ment portions 90 and 9| are spaced apart. t
the
tiallycam
180°surfaces
apart A
and
and
that
B are
the spaced
cam surf-me
s'ui
C
is spaced substantially 90° away from ca
faces A and B. It should also be noted
point that the cam surfaces I99 and Mt
cam lever 93 are spaced apart by a time int.
of one hour.
is For
so positioned
purposes ofasillustration,
to cause a the
lowering
cam leveg;
o~
thermostat setting at 10:00 P. M. and the c
lever 93 is so positioned as to cause the first
of pick: up at 5:30 A. M. and the second
of pick up at 6:30 A. M.
Assume the parts in the position showy-2i; .»
Figs. 1 to 7 of the drawings. The earn “8 is
disc
pointing
61 isdownwardly.
holding thethe
control
cam surface
mechanism
A of ‘
"‘
declutched position. the lever 92 is about
up the surface of cam lever 92 and the ti
stat is set for 70°.
The time of the day
.
by
thethese
electric
positions
clock iskeeps
substantially
running,8:30
the P.le
rides up the cam surface of the cam lever 92
conditioning the control mechanism -until the
time of 10:00 P. M. is established. At 30:00
clockwise movement of lever 92 as viewed in
Fig. 2 and consequent downward movement of
40 the portion 91 of the member 99 pivotally se
cured to the lever 92. This down movement of
P. M., the lever 92 falls oil of the cam surface
62 which causes clutching of the control mocha»
nism in the manner pointed out above. Such
the member 99 causes clockwise rotation of the
cam disc 91 and consequent movement of the
cam surface A out of engagement with the prong
46 99 of‘ the lever 1|. This movement also causes
clutching causes clockwise movement of the cam
disc 91 and the cam 19. This clockwise move“
ment of the cam 19 causes the cam, to engage
the night abutment member 99 to shift the
the portion 91 of the member 99 to move between
the cam disc 91 and the prong 99 of the lever 1|.
Upon a slight further movement of dial disc 9|,
the cam lever 92 will be moved out from under
neath lever 92 and lever 92 will be moved in a
counter-clockwise direction as viewed in Fig. 2
by means of the spring 99. Such counter-clock
wise movement causes the’portion 91 of the mem
ber 99 to move upwardly from between the cam
disc 91 and prong 99. The prong 99 will then
be forced against the rear surface of the cam
disc 91 by the spring 11. Such movement causes
the pins 14 of the clutch collar 99 to enter the
openings 19 of the gear 69 to clutch the gear
59 with cam disc 91. Rotation of the gear 99
will then cause rotation of the cam disc 91 and
the cam 19. The cam 19 will then engage the
abutment member 99 to alter the setting of the
thermostat from a high temperature setting to
a low temperature setting. Rotation of cam disc
91 will continue until the next cam surface comes
into engagement with the prong 99 of the lever
same to the position shown in Fig. 8. Movement
of the cam 19 and the cam disc 91 will continue
until substantially 180° travel thereof has been
completed at which time cam surface B of cam
disc 61 engages the prong 99 of the lever 1| to
50
declutch the control mechanism in the manner
pointed out above. Movement of the night abut
ment member 99 by the cam 19 to the position
shown in Fig. 8 causes lowering of the setting
of the thermostat from 70° to 60° as shown in 55
Fig. 8.
The thermostat will remain‘at the 60° setting
until the camsurface I99 of the cam lever 99
comes into operation. At 4:00 A. M., the lever
92 will ride up the cam surface N9 of cam lever
63 to condition the clutching mechanism for op~
eration in the manner pointed out above. At
5:30 A. M., the lever 92 will fall off of the cam
surface I99 and cause clutching action of the
control mechanism in the manner pointed out 65
above. when the clutching action has been
established, cam 19 and the cam disc 91 will. be
rotated in a further clockwise direction and cam
1|. Upon such engagement, the lever 1| is moved
rearwardly by the prong riding up the cam sur
face B. This will cause removal of pins 14 from
the openings 19 with a consequent declutching
action whereby further rotation of the cam disc
19 will engage‘ the upper abutment surface 99 to
cause movement of the day abutment member 70
a to the right to the position shown in Fig. 9
and consequent changing of the setting of the
91 and the cam 19 is prevented. The cam 19 and
the cam disc 91 will remain in this new position
thermostat from 69° to 67". Since the cam sur~
face C is spaced only 90° from cam surface 13, the
control mechanism will be declutched'after 90°
75 until the cam lever 99 of the dial disc‘ 9| engages
rotation of cain disc 6? and cam ‘iii in the
pointed out above.
ie parts will then
positions shown in
thermostat setting
iii”.
9 ‘with the
cause pi'esetting or
‘g mechanism
the
6:39 A.
the lever
oil?) off the
\
consequent
..
'
' r adjusting
setting oi‘ the thermostat
determined times including cane means for
one directio . '
10
single step
means for adjusts
z‘niostat in the opposite direction in a p
"
0:; steps.
direction.
i
will at all times.
5
2. In combination uf'h an adjustable thermo
autoniatic means driven at a constant speed
thermostat
Si
to cause a clutching action
sotation
cans for manually adjusting the thermostat at
U
‘her rotation of the dial disc 6:
.
.eans for lowering the setting of the thermostat
in one step and cam means for raising the set g
of trice thermostat a
plura
"' steps, and
'
causes
“
iuither
nieui
-
iember
15
't
yredeterniii'iec
lusting the
'
step
so
so
setting of tlie
tantly driven
~
which
causes alowers
two the
of
~'
to raise the setting or
levers
'1
cans
ing ....ieaus
to lower
o to
single step and
he thermostat in 2. pl -
rality of steps.
stat,
5. In
a constantly
combination
c' ' with
Ten means,
adjustable
operatingti nieans
nno~
"
largely prevented.
disc
'
tne setting of said thewnostat in
l.—un o
setting of the the
by overshooti
at
‘it
predetermined
said
control
adjusting
moti
tin:
me s ’ \- ‘
-
“tic setting device
> Whe
consta
means for said theiniostat, motion ti'ansr
constantly
you me ns
ght shuto
to above
on by
driven by said constantly driven means, adjust-u
and 63 with respect to t Y
the time of the night lowering and tiq
two stage morning pickup may be var‘ ""
'
Although i have disclosed a two stage morning
picuwup,
is Within the contemplation of this
timemeans
means for
between
said tl'ieiniostat,
constantly
motion
driven
ti'an
on eaus,
said adjusting means, and means actuated. at
g;
determined t1 -es by said operating means to con
invention
may be accomplished
to include any
by number
increasing
of stages.
the
trol said motion transmitting means to lower the
setting of said thermostat in a single st
to
@1 abutment surfaces on the day abutment morn-
raise the setting of the thermostat
her 83, the number oi cani surfaces between the
1/
'
a '
and i‘ "nuai means for adjus
regardless of the position of
.
‘ meai'is.
controlled thermostat setting meal‘!o may occupy,
the theri'nostat may be manually adjusted by
manipulation of the pointer 3?. If the
are
in the positions shown in
‘l
the cam
‘38 is vertically arranged to permit lateral niove~
ment of the abutment members St
83
whereby the thermostat may be set in any post“
tlon by manual operation of the pointei“ 3?. Also,
the parts are
the position shown by "1g. 3,
the cam ‘i8 is adapted to enter the space between
60 the abutment portions Oil and 90 to permit lat
eral movement of the abutment members 8d and
No binding action, whatsoever, occurs to
prevent free and easy manual manipulation
Whethei' the time setting mechanism be posi~=
tioned for day operation, nig t operation or
morning pick-up operation.
Although l have disclosed one speciiicembodi
merit of this invention, my invention should not
be limited thereby but should be limited only
by the scope of the appended claims and the
prior art.
'
I claim as my invention‘:
1. ‘in combination with an adjustable thermo
stat, time means for adjusting the setting oi the
75
thermostat at predetermined times including cam
stat, constantly driven shaft, cam means cgiveu
said
adjust ng means for the t‘
clutchmeans,
means and
between
means
said
actuated
shaft and
by said
means “.or con ‘oiling said clutch means to
the
ermost
in one 61 'ection
a1
"
ti no, to adjust partially the thei no-
stat in the other direction at anothei' predeter~
ned time and to adjust completely the thermo
in the second direction at another predeter“
time.
7. In combination with an adjustable thernio- 60
stat, a constantly driven shaft,
means driven
by said shalt, adjusting means for the thermo
stat, clutch means between said shaft and said
adjusting means, and means actuated by said
cam means for controlling said clutch means to (is
lower the setting of the thermostat at a prede
termined time, to rise partially the setting oi’ the
thermostat at another predetermined time and to
raise completely the setting of the thermostat at
another predetermined time.
70
In a device of the class described, a con
stantly driven shaft, cam means driven by, said
shaft, actuating means ‘for performing a function,
clutch means between said shaft and said actuat
ing means, declutclnng means operated by said 75
5
2,117,768
actuating means, and a mechanism associated
with said declutching means and operated by said
cam means to cause operation of said actuating
means through a plurality of steps, the ?rst step
being greater than the remaining steps.
9. In combination, a clock, means constantly
perature in two separate steps in the morning,
and means for manually adjusting ‘the thermostat
driven by the clock, a thermostat, adjusting
in either direction when the thermostat is in its
means therefor including a normally stationary
cam, a clutch for intermittently connecting said
high setting.
10 cam to the ?rst mentioned means for operation
thereby, a member constantly driven by said
clock, cams mounted on said member for actuat
ing said clutch to cause the thermostat to be set
to a lower temperature in one step at night and
15 to cause the thermostat to be set to a higher tem
perature in two separate steps in the morning.
10. In combination, a timer, means constantly
driven by said timer, a thermostat, adjusting
means therefor including a normally stationary
20 cam, a clutch for intermittently connecting said
cam to the ?rst mentioned means for operation
thereby, a member constantly driven by said
timer, cams mounted on said member for actuat
ing said clutch to cause the thermostat to be set
to a lower temperature in one step at one time
and to cause the thermostat to be set to a higher
temperature in separate steps at another time,
and means for manually adjusting the thermo
stat at will at all times.
30
clock, cams mounted on said member for actuat
ing said clutch to cause the thermostat to be set to
a lower temperature in one step at night and to
cause the thermostat to be set to a higher tem
11. In combination, a clock, means constantly
driven by the clock, a thermostat, adjusting
means therefor including a normally stationary
cam, a clutch for intermittenetly connecting said
cam to the ?rst mentioned means for operation
thereby, a member constantly driven by said
'
12. In combination, a clock, means constantly
driven by the clock, a thermostat, adjusting 10
means therefor including a normally stationary
cam, a clutch for intermittently connecting said
cam to the ?rst mentioned means for operation
thereby, a member constantly driven by said
clock, cams mounted on said member for actuat 15
ing said clutch to cause the thermostat to be set
to a lower temperature in one step at night and
to cause the thermostat to be set to a higher
temperature in separate steps in the morning,
and means for predetermining the high and low 20
settings.
.
13. In combination, a clock, means constantly
driven by the clock, a thermostat, adjusting
means therefor including a normally stationary
cam, a clutch for intermittently connecting said 25
cam to the ?rst mentioned means for operation
thereby, a member constantly driven by said
clock, cams mounted on said member for actuat
ing said clutch to cause the thermostat to be set'
to a lower temperature in one step at night and 30
to cause the thermostat to be set to- a higher
temperature in two separate steps in the morning,
and means for individually adjusting each of the
high and low settings.
1
“'
ANDREW G. McNICOLL.
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