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Патент USA US2112654

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March 29, 1938.
2,112,654
INTERVAL TlMER SWLTCH
>Filed Aug. 28, 1954
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2 Sheets-Sheet l
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INVENTOR
Frederick Lux.
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A770
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March 29, 1938.
F_ LUX
2,112,654
INTERVAL TIMER SWITCH
-Filed Aug. 28,"1954
2 sheets-sheet 2
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£1
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INVENTOR
Fvedevich Lux
Patented Mar.>`2b9, 1938 f
2,112,654
-UNITED STATES PATENT OFFICE
2,112,654
INTERVAL TIMER SWITCH
Frederick Lux, Waterbury, Conn., assignor to Lux
Clock Manufacturing Company', Waterbury,
Conn., a corporation of Connecticut
Application August 28, 1934, Serial No. 741,801
18 Claims. (Cl. 20G-37)
This invention relates'to time-controlled ap
the line 6_6 of Fig. 5, and showing the switch
paratus, and more particularly to an interval in “closed” or operative position.
timer adapted to operate a switch mechanism
Fig. 7 is a fragmentary transverse sectional
after the expiration of av predetermined period view taken along the line ‘I-l >of Fig. 5, show
of time.
.
ing the switch in “open” or inoperative position. 5
One object'of this invention is to provide an
Fig. 8 is a diagrammatic view of the switch
electric switch mechanism which is controlled and circuit, showing the same connected as a
by a clock movement and has associated there
“single pole” switch.
with a manually adjustable pointer for the dual
Fig. 9 is a diagrammatic view of the same,_
purpose of closing the circuit through the switch, showing the connections fora “doublesingle lo
and winding the clock movement to cause it to pole” switch.
ì
operate said switch after any desired length of
Fig. 10 is a diagrammatic view of the same
time.
'
\
A further object is to provide a time-controlled
switch of the above nature in which the pointer
is associated with means for initially locking it
on the outside of the dial, vmaking it necessary
to press the pointer against the dial to close
the electrical circuit before the pointer may
20 be turned to the desired time interval setting,
means being also provided whereby the pointer
` may be turned backwardly in case it may have
been set to operate at a greater time interval
than desired.
A further object is to provide an interval timer
25
of the ~above nature having two independent
switches which are simultaneously operated by
the clock mechanism, whereby various types of
so
35
as it appears when connected as a “double break
single pole” switch.
'
.
Fig. i1 is a fragmentary sectional view of a.15
modified form of time switch in which the clock
work mechanism is rigidly held in the. clock
frame, and the pointer shaft is movablewith re
spect to same.
Referring now to the drawings in which like N) 0
reference numerals denote corresponding parts
throughout the several views, the numeral I Ii
indicates a cup-shaped clock casing preferably
made of molded insulating composition, such
,as “bakelitef’ The casing I0 has an open rear 25
end and a closed front end II which constitutes
the clock dial, having the usual time-indicating
scale I2 marked thereupon, herein illustrated as
being graduated to indicate the sixty minutes
electric switch connections may be accomplished.
A further object is to provide an interval timer
of the above nature which will be simple in
of an hour, as shown in Fig. 1.
construction, inexpensive to manufacture, easy
to install and manipulate, compact, ornamental
its back upon a flat surface, such as a table top
in appearance, and very eñicient and durable in
entering the casing I0, and a similar “lead-ou ”
use.
»
Withthese and other objects in view there
have been illustrated on the accompanying draw
ings two forms in which the invention may be
conveniently embodied in practice.
`
In the drawings:
Fig. 1 represents a perspective view of the in
terval timer.
Fig. 2 is an enlarged vertical sectional view
45 through the same.
Fig. 3 is a perspective view of a portion of the
dial and the pointer locking clip.
Fig. 4 is a. detail perspective view of the cam
30
'I‘he clock casing I0 is adapted to rest with
I3, and has a two-conductor “lead-in” cord I4
cord I5 passing out of said casing at the diam- 35
metrically opposite side. The “lead-in” cord I4
is provided with a two-prong plug I6 for en
gagement in any convenient Wall outlet I'l. The
“lead-ou ” cord: I5, however, may be provided
with a plug socket I5a for completing the elec
trical circuit through any desired power con
suming device, not shown.
The mechanism of the clock includes a spring
motor generally indicated by the numeral I8, 45
and a pair of motor plates I9, Isa, held in rigid
spaced relationship by pillars 20.
The upper
and lower portions of the motor plates are pro
member and associated locking block.
vided with alined apertures for slidable engage
Fig. 5 is a transverse sectional -view through ment upon a. pair of horizontal upper and lower 50
the clock casing,‘showing the switch mechanism _ posts 2l and 22. The forward ends of the posts
connected as .a double pole switch, the view 2| and 22 are anchored as by heading over
being- taken along the- line 5_5 of Fig. 2, look
their reduced ends 2Ia and 22a to a front metal
ing in the direction of the arrows.
plate
23 positioned within the cylindrical cham
55
Fig. 6 is a vertical sectional view taken along ber of the casing III, and detachably secured to
50
2,112,654
the back of the clock face II, as by means of a
pair of screws 24.
'I‘he rear ends of the posts 2| and 22 are pro
vided with reduced threaded extremities 25 car
rying nuts 26 for detachable engagement with a
rear circular plate 21. The rear plate 21 is pref
erably made of three connected sheets of lam
inated “bakelite” and is adapted to ñt into an
annular groove 28 provided in the open rear end
of the casing I0.
It is to be noted from the above construction
that the motor unit I8 will be slidable along vthe
supporting posts 2| and 22, and said posts 2|
and 22 with the front and rear plates 23 and 21
15 constitute a motor and switch supporting frame
which may be inserted or removed as a unit from
the casing whenever desired by merely removing
the screws 24.
'I'he clock motor I8 is driven by a main coil
20 spring 29 connected at its inner end to a main
shaft 30. The main shaft 30 is rotatably journal
ed in the slidable motor plates I9 and |9a, and is
provided with a reduced squared shank 3| which
extends forwardly through a suitable aperture 32
25 provided in the clock face | I and adjacent metal
A bushing 33 carrying an indicating
. plate 23.
pointer 34 is non-rotatively fitted upon the for
ward end of the squared shank 3|.
The indicating pointer 34 is located in front of
30 the dial face I I and is provided with a rectangular
handle 35 preferably constructed of insulating
material for facilitating the manipulation of said
pointer and clock mechanism. The handle 35 is
adapted to be held against the front surface of
35 the pointer by means of a fillister-head bushing
screw 36 located in a socket 31 in said knob 35 and
detachably engaging the reduced threaded end 38
of the squared shank 3|.
In order to prevent the handle 35 from twisting
40 relative to the pointer 34, a pair of projecting
studs 39 are made rigid to the front surface of
' the pointer and are adapted to iit'into alined
sockets 40 provided in the adjacent surface of said
handle 35.
To successively close the switch mechanism 4|
45
and Wind the spring 29, it will be necessary to ñrst
press the handle 35 inwardly tothe dotted line
position shown in Fig. 2, and then to rotate said
handle in a clockwise direction‘until the pointer
reaches the desired time at which the switch 4|
is to open. The power from the main spring 29
is delivered to the main shaft 38 through a fric
tion slipping mechanism 42 in a well known man
ner, which construction permits the turning of
the indicating pointer 34 and the shaft 30 in
either direction independently of the driving gear
without injuring the motor unit I8.
' The pointer carrying bushing 33 in its assem
bly upon the squared shank 3| is abutted against
an intermediate sleeve bushing 43 loosely sur
rounding said shank 3|, which in turn is abutted
against the adjacent face of a cam disc 44 non
rotatively mounted upon the squared ~shank 3|.
' 'I‘he cam 44 abuts against the shoulder formed
65 at the junction of the round main shaft 38 and
the squared shank 3|. This construction causes
the motor unit I8 to be moved upon the support
ing posts 2| and 22 whenever the pointer knob 35
is- depressed.
70
`
In order to hold the clock movement _|8 in de
pressed position, the cam disc 44 is provided with
a radial rectangular recess 45 which is normally
adapted to ñt about a stop block 46 secured to
the rear face of the frontplate 23, as by an in
tegral rivet 48. It will be obvious from this con
struction that when the handle 35 is depressed,
the cam 44 will be forced rearwardly with the
shaft 38 to the dotted line position shown in Fig.
2. The locking recess 45 in the cam disc 44 will
then clear thestop block 45, permitting the han
dle 35 and pointer 34 to be rotated clockwise to
any desired position.
To lock the indicating pointer 34 and handle
35 in their initial or “zero” position, provision is
made of a locking clip 49 located on the clock face
||, as best shown in Figs. 1 and 3. The clip 49
comprises an inverted U-shaped body member 50
having a pair of radial inner pointer-embracing
lugs 5I and 52. The bottom legs of the locking
clip 49 are provided with a pair of depending lugs
53 which llt into sockets 54 formed in the dial
face | I, said lugs preventing the locking clip from
twisting. The clip is held in position upon the
dial plate || by a single screw 55.
'I'he right-hand pointer engaging lug 52 is cut 20
away at its bottom edge to allow the pointer 34
to pass it when the handle 35 is depressed. The
left-hand lug 5I liesv in contact with the face of
the dial and prevents the pointer 34 from being
rotated in a counter-clockwise direction beyond 25
the zero point, and also prevents it from being ro
tated more than one revolution in a clockwise di
rection.
Switch mechanism
The switch mechanism 4|,‘previously referred
to, is adapted to be actuated by a floating depres
sor plate 56 of substantially thick insulating ma
terial for making- and breaking the circuit
through a pair of spaced “lead-in” angular con 35
nection terminal brackets 51 and 58, and a pair
of “lead-out” connection terminal brackets 59
and 68 by means of a pair of movable curved
spring contact strips 61| and 62 adapted to be en
gaged by said floating plate 56. The “lead-in”
terminals 51 and 56 are provided with upstand 40
ing lugs 51a and 58a having binding posts .63 and
63a screwed therein to make an electrical connec
tion to a pair of conductors 64 and 65 of the
“lead-in” cord I4, as shown in Fig. 5.
-
'I'he spring contact strips 6| and 62 are pro 45
vided at their fixed ends with flattened extremi
ties 68a which are adapted to lie in fiat contact
with said “lead-in" terminals 51 and 58, said
parts being held permanently on the inner face
of the rear plate 21 by means of a pair of for
wardly extending guide pins 66 having reduced
rear shanks 61 provided with heads 68 seated
in apertures formed within the laminated rear
plate 21.
The floating depressor plate 56 is preferably 55
provided with oppositely curved ends 69 and 69a
having central recesses 18 adapted to slidably
embrace the posts 2| and 22. 'I‘he upper end
of the iìoating plate 56 is provided with a pair
of side apertures 1| in which the guide pins 66
are slidably ñtted, and said insulating plate 56
is adapted to be normally pressed forward by
means of a pair of yhelical compression springs
12 surrounding said pins 65. The lower end of
the iioating plate 56 is also urged forwardly by
the free ends -cof the spring contact strips 6|
and 62.
‘
In order to loosely connect the floating plate
56 with the motor unit |8,'provision is made of a
thrust block 13 preferably formed integral with
the front face of said plate 56 in a central posi
tion. 'I'he block 13 is provided with a counter
sunk socket 14 for receiving the reduced end 15
oi' the main shaft 3l. This construction limits
754
2,112,654
the forward movement of the insulating fioating
plate 56 which is normally held in equilibrium
ì in the position shown in Fig. 2 under the in
_lo
fluence of the springs 12 and resilient spring
contact strips 6I and 62.
The lower extremities of each spring 6I and
62 are provided with contact buttons 16, pref
erably of silver. and adapted to engage with
similar stationary buttons 'I1 positioned on the
adjacent surfaces of the "lead-out” terminals
59, 60. 'I'he fixed contact buttons _'I‘I are pro
vided with reduced Shanks 'I'Ia (see Fig. 7), se
cured by heads 'I‘Ib within apertures formed in
the laminated back plate 21.
15
-
'The "lead-out” terminal brackets 59 and 6D
are each formed with upstanding lugs 59a and
60a, mounted in which are a pair of threaded
binding posts 'I8 and 18a for connection to a
pair of conductors ‘I9 and 88 of the “lead-out”
20 -cord I5.. 'I'he “lead-in” terminal brackets 5l
and 58 and the “lead-out” terminal brackets
59 and 60 are held against twisting by means
of rivets 8|.
.
While the switch 4I is illustrated in Figs. i
25 to 7 as connected for a “double pole” switch, the
construction of said switch is not limited to this
connection, but may also be used as shown in
Figs. 8, 9 and 10. In Fig. 8, by eliminating one
of the switch blades 62 from the circuit, the
30 switch may be connected as a “single pole”
switch. Fig. 9 shows the switch connected as a
“double single pole” switch, whereby two power
consuming devices may be simultaneously oper
ated by the same time clock. Fig. l0 shows the
35 switch connected as a "double-break single pole”
switch, in which iorm‘the arcing of the switch is
materially reduced.
\
Operation
40
In operation, the timer switch will ñrst be ín
cluded in an electrical circuit, such as shown in
Fig. l, after which the indicating pointer 38 and
the handle 35 will be manually depressed suffi
ciently to clear the lug 52 of the locking clip
49. The handle and pointer will then be rotated
45 in a clockwise direction to the desired time in
terval indication, at the lapse of which the cir-=
cuit is to be opened.
It is to be understood that the device may° be
set to operate for any interval of time from a
50 fraction of a minute up to the maximum range
of the clock mechanism.
During the operation described above, the cam
disc 44 will be unlocked from the stop block '46,
and the spring 29 will be wound to furnish power
55. for driving the clockmovement and returning
the pointer 34 and handle 35 to their initial
positions. The camdisc 44 will remain in the
closed circuit position shown in Fig. 4 until the
pointer has reached “zero”, at which time the
60
slot 45 on said cam disc will come into alinement
with the stop block 46, and permit theswitch
to be restored by spring action to open circuit
position.
'
'
.
It is to be noted at this point that the con
struction of Athe switch mechanism 4I and the
controlling cam M is such that the space included
between the contact buttons 'I6 and 'I'I in their
normal separated position is somewhat less than
the height ofthe stop-block 46. Consequently,
in pushing in on the handle 35, the buttons 'I6
and 'I1 are contacted to close the circuit before
the cam disc.“ has cleared the stop-block 46,
‘ and further movement inwardly of the knob 35
75 is necessary to unlock the cam M from said
-
3
block 46 so as to permit turning of the same.
During this further movement inwardly, the up
per end plate 56 will be tilted out of its normal
vertical position, as shown in Figs. 2 and 6, to
assume an inclined position as indicated by dotted
lines in Fig.' 6.
One advantage of the present invention is that
minor variations in size of the several coacting
parts due to manufacture or wear will be com
pensated ‘for without affecting the working qual
ities in any way.
Fig. 11 shows a modiiied form of construction
wherein the motor unit I8 is held in a ñxed
position, and the main shaft 82 may be moved
laterally independently of said unit I8. The mo
tor unit I8 is mounted upon a tubular arbor 83
within which the main shaft 82 is slidably ñtted.
The motor plates I9 and I 9a are supported upon
posts 84 secured to the front and rear plates 23
and 2l similar to the posts ZI and 22 in the ñrst 20
form. The post 84, however, has a reduced see~
tion 85 upon which the motor plate I9 is held in
assembled position, as by means of a pair of
spacing sleeves 86.
In order to connect the stationary motor it
with the axially movable shaft 82, said shaft 82
is provided with an intermediate projecting
transverse pin 8l', which is adapted to slidably
engage in a pair of opposed elongated slots ¿it in
the tubular arbor 83. Otherwise, the construc
tion of the modiñed form i-s identical with the
first form of the invention.
While there have been disclosed in this speci
fìcation two forms in which the invention may
be embodied, it is to be understood that these
:forms are shown for the purpose of illustration
only, and that the invention is not to be limited
to the speciñc disclosures but may be modiñed
and embodied in various other forms without
departing from its spirit. In short, the inven 40
tion includes all the modifications and embodi~
ments coming within the scope of the following
claims.
Having thus fully described the invention,
what is claimed as new, and for which it is de 45
sired to secure Letters Patent, is:
l. In an electric time-controlled switch, a
frame, a floating longitudinally movable self
contained spring motor clock movement mount~
ed in said frame, a shaft to which said clock
movement is rigidly secured for axial movement
therewith, but being rotatable relatively thereto,
driven by said movement and projecting out of
said frame, a setting handle and pointer on said
shaft, an electric switch located in said frame, 55
means connected to said shaft for closing said
switch when said handle shaft and movement are
axially depressed, and means to hold said shaft
in depressed position and said switch closed dur
ing the operation of said clock movement.
2. In an electric time-controlled switch, a
frame, a self-contained clock movement slid
ably and longitudinally mounted in said frame,
a shaft movable longitudinally with said move
ment but rotatable with respect thereto and 65
carrying a setting handle and an indicator, a
switch mounted in said frame, switch closing
means responsive to the manual movement of
said handle and movable with said shaft, and
means for holding said .shaft in closed circuit 70
position for maintaining said switch closed dur
ing the loperation of said clock movement;
3'. In an electric time-controlled switch, a
frame, a self-contained clock movement movably
mounted to slide longitudinally in said frame, a 75
4
2,112,654
shaft movable longitudinally with said move
ment but rotatable with respect thereto and
carrying a setting handle, a switch mounted in
said frame, switch closing means responsive to
the manual movement of said handle and mov
able with said clock movement.
in said frame and having a main shaft, a handle
and pointer carried on the forward end of said
shaft in front of said dial face, a switch mecha
nism adapted to be operated with the sliding of
said clock movement, means for holding said G1
clock movement in switch closing position dur
4. In an electric time switch, a base having a
ing the predetermined period of time for which
projecting stud, a spring metal strip having one
end mounted on said stud, said strip having a
said clock movement is set, said means compris
ing a raised block mounted on said frame, and
movable contact on its free end, a fixed contact
a cooperating cam member carried by said shaft
in alinement with said- movable contact, an insu
and having a notch for engagement with said
block for holding said movement in inactive posi
lating tilting plate engaging said strip and hav
ing an aperture guided by said stud, a spring
surrounding said stud and pressing against said
plate whereby said plate may be tilted beyond
circuit closing position.
tion.
l1. In an electric time switch, a frame, a self
contained clock movement slidable longitudinally
as a unit in said frame, a stationary contact
5. In an ,electric time switch, a frame, a self
contained clock movement longitudinally slid
able in said frame, a stationary switch contact
button, a spring strip fixed at one end to said
frame and having a mova-ble contact button on
carried by said frame, a movable contact actu
ated by the sliding of said clock movement, and
a depressor plate spring-pressed toward said
clock movement and being located between said
clock movement andsaid movable contact for
25 opening and closing the circuit through the
switch coincident with the sliding of said clock
plate spring-pressed toward said clock move
ment and being interposed between said slidable
clock movement and said spring strip for bring
movement.
the free end thereof, and a floating depressor
ing said movable contact into engagement with
said stationary contact when said clock move
ment is moved longitudinally as a unit.
» -
'
contained clock movement movable longitudi
y
6. In a time switch, a slidable clock movement,
a stationary contact, a movable contact, and a
80 floating plate located between said clock move
ment and said movable contact and actuated
by the sliding of said clock movement for open
ing and closing said switch, spring means for
pressing both ends of said plate toward said
clock movement, said plate being adapted to tilt
around said fixed contact as an axis after the
switch has been closed to _compensate for minor
variations in size of the working parts.
7. In an electric time switch, a clock frame
40 having a pair of rods extending from the iront
and rear thereof, a self-contained clock move
vment mounted to slide longitudinally upon said
rods and having a main shaft provided with a
handle and an indicator outside the clock dial,
45 means initially in the path of said indicator to
prevent rotation thereof until said handle and
indicator are depressed, and a switch member
carried by said clock movement adapted to close
the circuit through a power consuming device
when said handle and indicator are depressed.
8. In an electric time switch, a clock casing, a
self-contained clock movement mounted to slide
nally as a unit in said frame, an electric switch
comprising a pair of fixed contacts, a pair’ of
spring strips having movable contacts and nor 30'
mally out of contact with said ñxed contacts,
and a switch closing member engageable by said
clock movement for pressing said movable con
tacts against said fixed contacts.
13. In an electric time switch, a frame, a spring 55
motor clock movement slidably mounted Ito move
longitudinally in said frame, an electric switch
comprising a stationary contact and a movable
contact, a depressor plate spring-pressed toward
said clock movement and being interposed be 40
tween said clock movement and said movable
contact for forcing’the latter against saidlsta
tionary contact when said clock movement is
moved.
14. In an electric time-controlled switch, a 45
base, a timer, means for setting said timer, a
fixed contact on said base, a spring strip secured
at one end tc said base at a distance from said
fixed contact, said spring strip having a movable
contact on its free end in alinement with said 50
fixed contact, a tiltable plate for flexing said
strip to bring said movable contact into engage
longitudinally in said casing and having a main
ment with said iixed contact, and a spring en
shaft, a handle and indicating means on the
gaging the base of said strip and pressing upon
said tiltable plate to permit said plate to tilt
55 forward end of said shaft associated with the
dial of said clock, means initially-in the path of
said indicating means to prevent rotation there
of until said handle and indicating means are
depressed, a switch, and‘means responsive to the
sliding motion of said clock movement as a unit
operated means to hold said tiltable plate rear
wardly, and means operated by said timer to
release said holding means to permit said tilt
for closing said switch.
position.
'
9. In an. electric time switch, a clock frame
having a dial face, a self-contained clock move
ment mounted for sliding movement longitudi
nally in said frame and having a main shaft to
which said clock movement is rigidly secured for
axial movement therewith. but being rotatable
relatively thereto, a switch mechanism located
in said frame and responsive to the sliding of said
70 clock movement, and means for holding said
clock movement in circuit closing position dur
ing the predetermined period of time forwhich
it is set.
v -
25
12. In an electric time switch, a frame, a self
`
'
ld10. In an electric time switch, a frame having
a dial face, a clock movement mounted to slide
beyond the circuit closing position, manually
able plate to move forwardly to openV circuit
'
15. In an electric .time-controlled switch, a
casing, a self-contained spring motor longitudi
nally slidable in said casing as a unit, said‘unit
including a main shaft to which said sprirg
motor is rigidly secured against axial movement
relatively thereto but being rotatable relatively
thereto, an electric switch, means operated by
the sliding of said shaft axially with said motor 70
and the turning of said shaft to close said switch,
means for locking‘said motor in switch closing
position, and means responsive to the running of
said motor and operated bythe rotation of said
shaft for unlocking said timing circuit and open
ing said switch at the expiration of a prede
termined time interval.
16. In an electric time-controlled switch, a cas
ing, a spring motor longitudinally slidable in said
thereto but being ‘rotatable relatively thereto,
.spring means for resisting the sliding oi said
movement, means to wind said clock movement
and set it for a desired time interval, means
casing as a unit, said unit' including a main actuated by the sliding of said movement and
shaft to which said spring motor is rigidly seu the turning of said shaft to start the operation
cured against axial movement relatively thereto `of said device, means to hold said movement in
but being rotatable relatively thereto, an electric position to maintain said device in operation,
switch, said switch including movable and ñxed and means responsive to the running down of
contacts and spring means for pressing said said clock movement and the rotation of said
movable contact toward open circuit position, shaft for releasing said movement at the ex 10
means operated by the sliding of said shaft axi
piration of the desired interval of time for per
ally with said motor and the turning of said mitting said spring means to return said move
shaft to close said switch, means for locking ment to its initial position.
said motor in switch closing position, and means
18. In a timerfor controlling an operatable
responsive to the running of said motor and the
rotation of said shaft for unlocking said motor
and opening said switch at the expiration of a
predetermined time interval.
17. In a timer for controlling an operatable
device, a casing, a clock movement longitudinally
l slidable in said casing as a unit, said unit includ
ing a main shaft to which said spring motor is
rigidly secured against axial movement relatively
device, a casing, a self-contained time-responsive
unit longitudinally slidable in said casing and
including a main shaft, means actuated by the
sliding of said unit and the turning of said main
shaft to start Athe operation of said device, and 20
means responsive to the running of said time
responsive unit for stopping the operation of said
device.
FREDERICK LUX.
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