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Патент USA US2113274

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April 5, -193s._
Filed Nov. 8, 1934
2 Sheeis-Sheet 1
Frederick LuX.
19 I
April 5, 1938.
Filed Nov. 8, 19-54
2 sheets-sheet 2
BY Freda rack Lux
I541? WWY
Patented Apr. 5, 1938
Frederick Lux, ‘Waterbury, Conn., assignor to
Lux Clock Manufacturing Company, Waterbury,
Conn., a corporation of Connecticut
Application November 8, 1934, Serial No. 752,081 7
2 Claims.
(-01. 161-23)
This invention relates to timing devices, and by a ?at plate I3 having inturned tongues l4
more particularly to an interval timer adapted and H3 at its upper and lower edges, respectively,
to sound an alarm after the expiration of a pre
determined period of time.
said tongues being adapted to be slipped within ‘
the interior of the casing Ill. The upper inturned '
tongue I4 is provided with a round aperture which
is adapted to receive a short-stud l6 depending
the interior of the top “surface of the clock
operating various domestic appliances, which will from
casing Ill. The bottom tongue, i5 is provided with
also be useful in hospitals,‘ laboratories, pho
a drifted tapped hole l1 for receiving a locking
tographic studios, etc.
10 _ A further object is to provide a timing device } screw I8 extending upwardly through the base 10
of the spring-operated type combined with a of the casing l0, said screw also serving to hold
spring-operated alarm device which will sound an an ornamental base IS in assembled position
under the casing I8.
alarm at the end of a time period.
The interior mechanism of the present inven
A further object is to provide an alarm device
15 of the above nature in which the'time spring and tion comprises a spring-operated time motor 28 15
alarm spring will be simultaneously wound by which is adapted to be governed by a usual form
the manual turning of the setting pointer, and in of time escapement 2|, and also a spring-operated
One object of this invention is to provide a
time controlled alarm for use by housewives in
a which vthe time train will be automatically set
into motion upon the release of said pointer, but
20 in which the alarm train will be restrained from
operation until the expiration of the timing
A further object is to provide an alarm timer
having an adjustable pointer stop mechanism for
25 permitting the pointer to be manually set ac
curately to any repeatedly-used timing period,
such as in routine photographic work.
v A further object is to provide an alarm timer
alarm motor 22, which likewise operates through
a usual form of alarm escapement 23 (see Fig 3).
The time and alarm motors 20 and 22 are 20
adapted to be supported between front and rear
motor plates 24 and 25 held in spaced relation,
as by a plurality of pillars 26.
The complete motor unit, which for con
venience is indicated by the numeral 21, is sup- 25
ported upon the rear of a dial backing plate 28
by means of a plurality of small connecting
posts 30, three in this instance. A thin metal
.dial plate 3| is positioned against the front face
of the backing plate 28 and is provided with 30
manipulate, compact, ornamental in appearance,. suitable time indicating indicia 32, which in this
of the above nature-which will be simple in con
30 struction, inexpensive to manufacture, easy to
' and very ef?cient and durable in use.
With these and other objects in view, there has
been illustrated on the accompanying drawings
35 one form in which the invention may be con
veniently embodied in practice.
In the drawings:
Fig. 1 represents a front elevation view of an
interval timer embodying the invention.
Fig. 2 is a transverse vertical sectional view
' of the same on an enlarged scale, showing the
clock mechanism in side elevation.
'Fig. 3 is a vertical sectional view, taken along
the line 3--3 of Fig. 2, showing a front elevation
45 of the motor unit as it appears in inoperative
particular case consists of a circular scale run
ning clockwise and adapted to designate a'period
of thirty minutes.
In order to prevent the dial plate 3| from be- 35
ing scratched, it is provided with a transparent .
cover plate 33, preferably of thin cellulose ma.
terial. The three plates 28, 3| and 33 may be
attached together as by rivets, not shown, to
form a unitary structure, and this unit is then 40
abutted against the front bezel l2 of the eas
ing III.
A pair of large tapped pillars 35 are attached
to opposite edges of the dial backing .plate 28
and extend rearwardly into abutment with the 45
rear casing plate l3, to which they are secured
as it appears in its operative or timing position.
Referring now to the drawings in'which like
The alarm sounding means comprises a cylin
drical cup-shaped gong 31 disposed between the
Fig. 4 is an elevation view of the motor per se, ' as by means of headed screws 36.
soreference numerals denote corresponding parts
throughout the several views, the numeral l0
indicates a substantially square casing having a.
front beaded edge H which terminates in an
interior relatively narrow bezel l2. ‘The rear of
55~ the casing 10 is adapted tobe completely closed
rear plate l3 and the motor unit 21, and is held 60
spaced from said back plate and saidgmotor unit
by means of a pair of short posts 38 having
riveted connection to said gong 31 and said rear
plate l3, as shown in Fig. 2.
The time motor 20 referred to above is driven by '55
' a spiral main spring 39 connected at its inner end
to a time arbor 40 and at its outer end to a sta
side of the end of said arm 60, said stop pin lying
in the path of the indicating pointer 52 to accu
tionary anchor stud 4| provided on the rear of
rately limit the swing thereof during the “setting”
the front plate 24. The time arbor 48 is jour
naled in the plates 24 and 25, and is provided
with a squared section 42 extending forwardly
60 in any desired adjusted position, a thin locking
block 64 is riveted or otherwise secured to the
through the dial plates 28 and 3 I, and terminating
in a .reduced threaded section 42a.
A large center driving gear 43 is non-rotatably
10 ‘mounted upon the squared section 42 and is op
eratively intermeshed with an alarm winding gear
44 loosely and rotatably mounted upon an alarm
‘arbor 45, joumaled in the plates 24 and 28.
In order to simultaneously wind the time motor
15 20 and the alarm motor 22,_the alarm' winding
gear 44 is provided with a forwardly projecting
pin 46 which is adapted to engage one edge of
a small winding arm 41 rigidly a?ixed to the for
ward ‘end of the alarm arbor 45. It will be noted
20 from this construction that, when the alarm gear
44 is rotated in a counter-clockwise direction, the
pin 46 will rotate the winding lever in the same
direction and cause an alarm spring 48 to be
wound up. The alarm spring 48_ is secured at its
25 inner end to the alarm arbor 45 and at its outer
end to a stud post 43 mounted on the rear of the
front plate 24.
An alarm driving gear 58 is frictionally mounted
upon the alarm arbor 45 in such a manner that
so during the setting operation, the arbor 45 will
' rotate without rotating said gear 50, but when
the alarm escapement is released, the gear 50
will be slowly driven by the alarm spring for
operating the alarm escapement. The time
35 motor 28 is likewise provided with a power gear
5| frictionally mounted upon the time arbor 40
in a manner similar to the mounting oi’ the alarm
gear 50. . One advantage of the use of such fric
tion slipping driving gears» is that an in?nite
number of settings of the pointer‘ may be obtained
on the time dial, permitting extremely accurate
and ?ne time settings to be made.
A time indicating and setting pointer 52 is
positioned in front of the dial 3|, and is provided
45 with a collar 53 for non-rotatable engagement
In order to positively lock the stop post arm
underside of said arm 68, and is provided at its
inner end with a pointed tooth 65 adapted to
selectively engage any desired point on the cir 10
cumference of'the notched disc 51. The block 64
may, however, be disengaged from the notches
by ?exing the arm 60 forwardly, as will be de
scribed later.
To restrain the operation of the alarm motor 22 15
until the indicating and setting pointer 52 has re
turned to the zero indication on the dial, provision
is made of a. bell-crank releasing lever 66 rigidly
secured on the forward end of a shaft 61 rotat
ably journaled in the plates 24 and 25, and pro
jecting a short distance in front of the front
plate 24, so as to support the lever 66 in spaced
relation therefrom. The lever 66 is constantly
pressed in a clockwise direction by a helical ten
sion spring 68 mounted on the forward end of the
shaft 61 between the front plate 24 and the re
leasing lever 66. The spring 68 is connected at
one end 69 with the front plate 24, and at its other
end 10 with an oblique arm 1| formed integral
with the releasing lever 66 (see Fig. 3).
The outer free end of the releasing lever 66 is
provided with a triangular shaped head 12 having
a rounded point and an inturned cam section 13,
terminating in an outwardly bent small hook
member 14. A small stop pin 15 is mounted on the 35
center winding gear 43 and projects forwardly
therefrom into registry with the cam section 13
and hook member 14. The shape of the hook
member 14 is such that a reentrant catch space '
16 is provided behind said hook member, the pur 40
pose of which is to engage the pin 15 when the
winding gear 43 has traveled 360 degrees, and
thus prevent more than one rotation of the same.
For the purpose of controlling the alarm escape
mechanism 23, the outer free end of the radial
arm 1| is provided with an inturned detent lug 11
with thesquared section 42 of the shaft 40. The
pointer 52 is held in spaced relation from the which is adapted to lie in the path of a catch arm
dial plate 3| bymeans of a tubular spacing sleeve 18 provided at one end of a vibratory bar 19 rotat
54 surrounding the squared section 42 and held ably journaled between the plates 24 and 25. The
50 in abutted relation between the adjacent faces of . rear end ‘of the bar 19 is provided with an angular 50
the center gear 43 and the collar 53 by means of a hammer arm 80 having a hammer head 8| upon
nut 55 screwed upon the reduced end of the its outer free end which is adapted to strike
shaft 48. The time pointer 52 is provided on op
against the interior wall of the gong 31 for sound
posite sides of the pivotal axis with a pair of ing the alarm. The vibratory bar 19 is provided
55 handle knobs 56 projecting forwardly therefrom.
with the usual form of two-arm anchor pallet
member 82 which coacts with the alarm train
' " _' I Pointer stop post
escapement mechanism 23 to vibrate the hammer
In case it is desired to set the alarm frequently against the gong 31 when the setting pointer re
at the samepredetermined interval, provision is turns to the zero position.
madeot 5a. selective pointer-stop device which
comprise's'la' circular‘ ?xed notched disc 51 con
.centricall‘y" positioned with respect to the dial
plate 3| adjacent the transparent plate 33. ' The
disc 51v is. held in ?xed position by means of a
65 rivet 51mm is provided with aseries of small
In the usual operation of the alarm where dif
ferent time settings are employed in successive
alarms, there will be no need of using the stop
post arm 60, and it may be swung around in a 65
notches 58 extending ‘about its entire circum
ference except at a short blank space 53 adjacent
the zero'position‘of ‘the dial 3|. A wide stop post
arm 63,‘ ; constructed of thin ?exible metal, is
70 pivotally'mounted at the center of the dial by‘
means of a ?anged bushing 5| extending through
the dial plates 38, 2|, the transparent plate 33
‘and the disc'51.v The outer end of the arm 60 is
.fprovided at one side with an index ?nger 52,
clockwise direction into an inoperative position
until the detent tooth block 64 is positioned in
the blank space 59 at the top of the notched disc
51. The operation will then be as follows:
The pointer 52 will ?rst be turned in a clockwise 70
direction to the' point on the dial scale indicating
the time period desired. This turning action of
the pointer 52 accomplishes three results simul
75 while a handle stop-pin 63 is mounted on the other
First-The time spring 33 will be wound and 75
the center gear 43 will be rotated in a clockwise
‘direction, causing the pin 15 carried thereby to
be released from the hook ‘l4, whereupon the re
leasing arm 66 will be permitted to swing in a
clockwise direction about its axis under the in
?uence of the helical spring‘ 68 until stopped by
the engagement of the nose of the hook member
‘I4 with the tubular sleeve 54 surrounding the
squared section 42 of the shaft, and also causing
10 the detent lug 11 of the radial arm ‘II to be car
ried into the path of the releasing arm 18 to lock
the alarm mechanism 23;
Second-The meshing of the gear 43 with the
alarm winding gear 44 causes the latter to rotate
15 counter-clockwise ;
Third.--The pin-46 carried by the gear 44 en
gages the alarm winding lever 41 and carries it
counter-clockwise, and consequently winds up the
alarm spring 48.
When the indicating and setting pointer 52 is
released, the following action will occur:
The tension of the time spring 39 acting
through the time train 20 will instantly start the
time escapement into vibration. The timing will
25 thus begin immediately upon the release of the
pointer, and no ‘extra mechanism is required to
start the same. As the pointer 52 is automatically
returned to zero position, it revolves the alarm
gear 44 about the alarm arbor 45 in a clockwise
'30 direction without operating the alarm spring and
escapement 23. The stud pin 46 carried by said
alarm gear 44 will thus be moved back to the zero
or “stop" position.
Shortly before the pointer 52 arrives at its zero
35 position, the stop pin 15 on the center gear 43 will
rotation. Consequently, when the indicating and
setting pointer 52 is rotated in setting the alarm,
it will strike against the stop post pin 63 and be
accurately set for the required timing period.
An important feature of the invention is the ex
treme simplicity of the operation. On timers of
this type made heretofore, it has usually been
necessary to wind two springs, one for the time
and one for the alarm. Moreover, it has been
customary to provide a shut-off for the alarm 10
motor to avoid the necessity of winding the alarm
spring each time the timer was used.
With the present invention as herein disclosed,
it is simply necessary to turn the pointer to the
time period required, which action winds the time 15
and alarm springs and locks the alarm from
operation until the expiration of the timing
' In case the operator desires to set the alarm 20
for a short period of time, such as ?ve minutes,
and wants the alarm to sound for the maximum
period, this may be accomplished by ?rst turning
the pointer 52 clockwise to the limit of its rota
tion (approximately 360 degrees), and then re 25
turning the pointer to the scale indication of ?ve
minutes, and releasing it.
While there has been disclosed in this speci?ca
tion one form in which the invention may be em
bodied, it is to be understood that this form is 80
shown for the purpose of illustration only, and
that the invention. is not to be limited to the
speci?c disclosure but may be modi?ed and em
bodied in various other forms without departing
from its spirit. In short, the invention includes 35
all the modi?cations and embodiments coming
engage with the straight cam surface 13 of the . within the scope of the following claims.
triangular head 12 of the releasing lever 65, and
rotate the" latter in a counter-clockwise direction
against the in?uence of the spring 68.»
The detent lug ‘ll of the releasing lever 66 will
be thus moved out of the path of the catch arm
18, whereupon the alarm escapement 23 will be
operated by the alarm spring 48 and cause the
hammer head 8| to repeatedly strike against the
45 alarm gong 31.
The stop pin ‘I5 will also engage in the hook ‘I4,
causing the time motor to come to a stop shortly
thereafter.- The hook 14 also serves to limit the
rotation of the pointer shaft counter-clockwis
beyond the zero point.
The alarm will continue to sound until the
winding arm- 41, which is then rotating clockwise,
strikes the pin 46 on the gear 44 which has previ
ously been returned to the inactive position shown
in Fig. 3.
It will also be understood that the duration of
the alarm-is dependent upon the time periodv for
which the timer is set, the maximum period being
approximately 10 to 15 seconds in‘ the particular
60 design of the mechanism herein illustrated.
In case one wishes to use the alarm clock fre
quently for the same time period, the stop post
60 may be brought into use. For example, if it is
desired to set the timer for a period of between 11
65 and 12 minutes, the stop post will ?rst be released
from its inactive position at the top of the dial by
grasping the handle pin 63 and ?exing the stop
post arm 60 forwardly so that the locking block
~70 64 will be out of engagement with the notches
58 of the disc 51. The arm 60 will then be rotated
to the position shown in Fig. 1, and the handle pin
63 will then be released, causing the block 64 to
engage the corresponding notch of the disc 51,
75 which will positively lock said arm 60 against
Having thus fully described the invention, what
is ‘claimed as new, and for which it is desired to
secure Letters Patent, is:
1. In an automatic timer, a main arbor, a
spring-actuated time controlled mechanism, a
dial, a setting lever secured to said arbor and
movable in front of said dial to indicate the timed
period, a toothed ratchet disc ?xed in position
with respect to said dial and concentric with said
arbor, a ?at resilient stop arm pivoted on the axis
of said arbor to limit the swing ‘of said setting
lever and permit it to be set quickly and accurate
ly to any desired predetermined period of time,
said stop arm having an oifset detent tooth nor
mally lying in the plane of said ratchet disc and
engageable with the teeth thereof, said stop am
also having a handle to permit ?exing of said
stop arm to swing said detent tooth out of engage
ment with the teeth of said ratchet disc whenever
it is desired to change the timed period, said
ratchet disc having a short upper section free
from teeth to receive said stop arm when out of
2. In an automatic alarm clock, a spring-driven
time arbor, a spring-driven alarm arbor spaced
from said time arbor, a pair of intermeshing gears,
one of which is rigidly mounted on said time arbor
and the other of which is loosely mounted on said
alarm arbor, a time train and an alarm train
driven by said gears respectively, an indicating
and setting pointer rigidly mounted on said time
arbor for simultaneously winding both the time
arbor spring and alarm arbor spring when said 70
pointer is swung from its zero position to the pre
determined setting point, a spring-pressed bell
crank‘lever pivoted at a point remote from said
time arbor, one arm of said lever having a bent
up detent lug to obstruct the operation‘ of said 75
alarm train when said lever is in one extreme
position, the other arm of said lever having a cam
hook, said time gear having an outstanding stop
pin adapted to engage said cam hook to swing
said bell-crank lever against the action of its
spring and release said alarm train when the tim-
ing period has expired, said lever having a re
entrant catch recess spaced from said cam hook
to receive said stop pin and prevent more than
one rotation of said pointer, said bell-crank lever
having a limited swinging motion to permit a
full 360 degree rotation of said setting pointer.
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