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Патент USA US3078368

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TIME SWITCH
‘ Filed Jan. 26, 1960
2 Sheets-Sheet l
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Hans
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Feb. *19, 1963
3,078,358
TIME SWITCH
Filed Jan. 26, 1960
2 Sheets-Sheet 2
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3,078,358
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Patented Feb. 19, 11963
2,
John R. Enochs, Ashiand, Mass., Herbert M. Dimond,
West Hartford, Conn., and Hans Springer, Ashland,
Mass., assignors` to General Eiectric Company, a cor
poration ot New York
Filed llian. 26, 1964i, Ser. No. 4,75@
S. Claims. @LEM-33)
This invention relates to a time switch, and more par
ticularly to a so-called sleep switch mechanism for a
timer. With such a mechanism, a manually presettable
means isprovided for manually moving a switch to a
closed position and for automatically maintaining the
Switch in the closed position for a preselected adjustable
time interval. Such a mechanism is particularly useful
for automatically turning ofi a radio receiver in the
evening after a person has gone to sleep, and for such use
it is conventionally termed a “sleep-switch.” The inven
tion is directed to such a sleep switch mechanism and the
inclusion of such a mechanism in a timerv provided with
a spring driven escapment and a small electric motor for
winding the spring.
of the improved sleep switch mechanism shown in FIG. 5
in a different position of operation;
FIG. 7 is a partial bottom view of the improved sleep
switch mechanism; and
FIG. 8 is a partial rear view of the front plate of the
timer.
Referring now to the drawing and iirst, particularly to
FIGS. l and 2; there is Shown a timer including our im
proved sleep switch mechanism. The timer illustrated in
FlG. l includes a support o-r mounting plate 1, a rear
plate 2 and a front plate 3. The hands 5, 6 and 7 of the
timer are rotated by an escapement ti in` a conventional
manner. A main spring 9 is provided for driving the
escapement, and a small electric motor lil is provided for
periodically winding the main spring 9 of the timer. This
rewind is accomplished through a drive worm 11 of the
motor which drives the rewind gear 1,2. The rewind gear
12 is suitably connectedy to one end of the main spring 9.
ln the device illustrated, the main spring 9 is rewound
about once every eight minutes, at‘which time the rewind
gear 12 is driven one complete revolution. Means includ
ing a cam 13 is provided for rewinding the main spring ‘9
and for de-energizing motor lli) after the rewind gear 12
has made one complete revolution. The details of this
Accordingly, it is a primary object of this invention to
provideA an improved low cost reliable mechanism for 25 control means do not form a part of this invention, and
therefore, will not be fully described. However, in ac
manually closing a switch and automatically opening a
switch after a pre-selected time interval.
ît is a further object of this invention to provide an im
proved low.-cost sleep switchwhich may be uniquely and
easily combined with a` timer provided with a spring driven
escapement and a small electric motor for winding the
spring.
cordance with the preferred embodiment of the invention,
the improved sleep switch mechanism is uniquely driven
by cam 13~and it should be appreciated that cam 13 is
driven one complete revolution bythe rewind gear 12
approximately every eight minutes. With this arrange
ment, although there» is insufficient power available from
In accordance with one aspect of this invention, a time
the escapement'for driving a sleep switch mechanism, the
switch includes means periodically rotated by a timing
mechanism .and a switch lever for openingy and closing a
switch. A manually movable control shaft is provided
mechanism may be uniquely driven as a function. of time
by the means for rewinding the main spring 9.
A switch which may be >utilized-to control apparatus
such> as a battery operated radio receiver may be provided
for actuation by> the vimproved sleep mechanism. In the
with a cam> fixed thereto for moving the switch lever. The
control shaft is arranged so that it may be manually selec
arrangement illustrated in` FIG. 3, current may be sup
tively positionable in any one of a plurality of adjustable
positions for holding the switch lever and the switch 40 plied tothe radio receiver by means of a pair of insulated
wires 14 and 1S. The wire 14 is grounded at löto front
closed, and positionable in another position for permitting
plate 3, and the wire 15- is ñXed to a switch contact plate
the switch lever to open the switch. The means periodi
17. ln a manner- well known in the> art, the switch plate
cally rotated by the timing mechanism is operatively con
17 »is mounted on an insulating plate 18. As illustrated
nected to the control shaft for periodically moving the
cam from any one of the preselected rotary positions for 45 iii-FIG. 3, insulating plate lämay be fixed to front plate
EE by means of rivets 19er other suitable securing means.
holding the switch closed toward` the other position for
permitting the switch lever to open the switch. Thus, a
person may manually close the switch and set the position
of theA control shaft for the time interval it is desired to
A-uniquely designed mechanismy is provided for man
ually completing the circuit from wire 15 to wire 14, and
for opening the circuit after a preselected> timeinterval.
maintain the switch closed, and the means periodically
Thisy manually prescttable means includes a switch lever
pivotally mounted to front. plate 3 at 21. As shown in
rotated by the timing mechanism will move the cam in
increments to open the switch after the lapse of the pre
set time interval. With this arrangement, an improved
FlG. 3, lever 2t? is generally V-shaped and is provided
with an outwardly extending arm 23 for contacting switch
Contact 22 to close the switchA by completing'. the circuit
reliable mechanism for manually closing a switch and
automatically opening'the switch after a preselected time 55 from contact 22 to mounting` plate 3.ï An arm 24V is
provided for pivoting the switch lever 2@ about` metal
interval is provided.
pivot 2,1. Switch lever 2t’l‘may beformed from a single
Other objects and attendant advantages will be apparent
piece of sheet material> and stamped into theformillus
from the following description taken in connection with
the drawing in which:
trated. Arm 23 is bent generally perpendicular toa base
FIG. l is a perspective view of a timer provided with 60 25 of the ‘sl-shaped lever to provide substantial line con
tact with switch contact 22, while arm 2d is bent gen
the improved sleep switch mechanism;
erally perpendicular to the base portion 25 of the V-shaped
FIG. 2 is a partial rear perspective view of the timer
shown in FIG. l;
switch lever for providing smoothv sliding `Contact with
FIG. 3 is a rear perspective view `of the improved sleep
he surface of- a unique sleep cam 261 to be more particu
larly described hereinafter. Thus, a simple switch lever
switch mechanism, the view being partially broken away
in order to show-details thereof;
which may be easily manufactured is provided.
FIG. 4 is a partial rear perspective view of the im
The means for operating the switch and switch lever
proved sleep switch mechanism showing the switch in an
2t? includes a manually rotatable control shaft 27 pro
open position;
vided with the unique sleep cam 26 iixed thereto. A man
FIG. 5 is a partial front elevational view of a portion 70 ual setting knob 28 may be connected to shaft 27 for
rotating the shaft and cam 26 to the desired position for
of the improved sleep switch mechanism;
opening the switch or presetting a time interval for main
FIG. 6 is a partial front elevational view of the portion
3,075,358
3
dit»
taining the switch closed. As shown more particularly
in FIG. 3, cam 26 is generally snail-shaped and is pro
formed in arm 45 of pawl 42. rthus, the spring 49* urges
pawl 42 to the lett and in a counterclockwise direction
vided with a raised generally circular surface 29 and a
as viewed in FIG. 3 to bias the top surface 47 of the
pawl into contact with time cam 13 and to hold the bot
hat straight surface 30 located closer to the axis of shaft
27 than the outer periphery of the curved circular surface
29. Thus, when the outer periphery of the circular sur
face 29 is in contact ‘with the lever arm 24, the switch
lever E@ is held so that the arm 23 is forced into contact
with switch contact 22 to close the circuit between wires
le and l5; whereas, when the arm 2li is in contact with
the flat portion of cam 26 the switch arm 23 is positioned
away from contact 22 to open the switch.
A tension coil spring 3i is provided for biasing arm
itti- into Contact with cam 25. As shown in FlG. 3, one
end of spring 31 may be rixed to an end 32 of arm 2d
while the other end of the spring may be fixed to a tab
T6 struck out from front plate 3. lt can be seen that
knob 28 may be manually rotated in a clockwise or
tom surface 43 of the pawl out of Contact with the teeth
of ratchet fil. ‘With the parts in the position shown in
FIG. 5, it can be appreciated that upon rotary move
nient of cam i3, an outwardly extending portion 52 of
the cam will contact the top surface 47 of the pawl, slide
along the top surface, and push pawl ft2 downwardly
against the tension of spring 49. During such movement,
the lower surface éd of the pawl will be placed in contact
with a side surface ot one of the teeth of ratchet 41 to
rotate the ratchet one increment in a clockwise direction
as viewed in FIG. 5. Upon further rotary movement of
cam i3, the cam will slide out of engagement with the
top surface ¿i7 of pawl ¿i2 and permit the pawl to be lifted
countercloclrwise direction to locate the curved portion
away from ratchet di under the influence of spring 49 to
the position shown in FlG. 6. The ratchet is provided
29 of the cam in an" one of a plurality of rotary positions
with respect to arm 24 to hold the switch closed, or knob
23 may be rotated in the direction of the arrow shown in
PEG. 3 to position arm 24 on the straight portion Sil of
with a plurality of teeth 53 for permitting cam 26 to be
rotated from any one of the positions wherein it holds
.he switch closed to the switch open position shown in
EEG. 4. ln order to prevent further clockwise rotation
of cam 2d after the parts have been moved to the switch
the cam to allow spring 3l to pivot lever
counter
clockwise as viewed in FIG. 4 about pivot 2l to open the 25 open position shown in PEG. 4, a portion 51% of ratchet
di is cut away, and is not provided with teeth. rihus, as
switch.
shown in PEG. 4, the bottom portion 48 of the pawl may
in accordance with the invention, means is provided
move upwardly and downwardly in cut away portion 54
for guiding shaft 27 and cam 26 for rotary move
of the ratchet without causing movement of the ratchet.
ment. As shown more particularly in FIDS. 3, 4 and 8,
As illustrated in FiG. l, suitable indicia such as
the shaft 27 upon which cam 2o is mounted extends
“oleep” and a time scale consisting of an arc-shaped ar~
through a hole 34 formed in the front plate 3, and is
row extending between numeral t) and o0, 60 referring to
provided with a reduced end portion 3S for extending
60 minutes may be positioned adjacent to set knob 2S.
through a small hole 36 formed in rear plate 2. As shown
When not in use, the sleep switch knob 2S will be in the
in FlG. 7, a sleeve bearing collar may be positioned be
position shown in HG. 1, arm 24 of the switch lever will
tween the rear surface of front plate 3 and the dat surface
be on straight surface 3d of sleep cam 26, and the ratchet
of cam 29 for guiding shaft 27 and cam 28 for rotary
4l wil-l be positioned with respect to the pawl 42 so that
movement. The collar 37 also cooperates with the re
duced end portion 3S of shaft 27 for restricting axial
movement of the shaft between front plate 3 and rear
plate 2. Stop means is provided for limiting rotation of
cam 3@ in a clockwise or counterclockwise d` ection. As
downward movement of the pawl will merely force the
bottom surface dä of the pawl into the cut-away portion
:fi-i of ratchet ¿il without rotating the ratchet and the
shaft 27.
lf it is desired to manually close the switch and have
shown more particularly in FlGS. 7 and 8, a rearwardly
the switch remain closed for a preselected time interval,
bent lug 33 is integrally formed with cam 2o for cooperat
knob 2li is rotated in the direction of the arrow shown in
ing with rearwardly extending tabs 39 and ftd formed on
to the desired time between 0 and 60. This
opposite sides of hole 3ft. The tabs may be inexpen 45 HG.
simultaneously rotates sleep cam 2d and ratchet 4l. Dur
sively struck out from front plate 3. With this arrange
ing such rotation, arm Z4 of switch lever 2li is lifted and
ment, when shaft 27 is rotated to the extreme clockwise
is preset in a rotary adjustable position on curved surface
position shown in FIG. 4, lug 3S contacts stop tab 39 to
Z9 of sleep cam 2o. The above-mentioned operation ob
prevent further rotation of cam Zd and shaft 27 in a
clockwise direction, and lug 3S cooperates 'with stop tab 50 viously moves switch blade 23 into contact with switch
contact 22 to close the switch. Following this setting
¿lo to restrict counterclockwise rotation of cam Z6 and
movement of knob 28, a particular ratchet tooth will be
shaft 27.
A unique arrangement is provided for automatically
located in position for actuation by pawl ft2. rlïhus, since
moving sleep cam 2o as a function of time from any one
the rewind gear 12 makes one complete revolution ap
of the plurality of adjustable positions for holding the
switch arm Z3 closed to the position shown in FlG. 4
proximntely every eight minutes, every eight minutes cam
i3 will move pawl d2 into engagement with succeeding
for opening the switch. To achieve this, a ratchet ¿il
is i'lxed to shaft 27 for rotation therewith, and a pawl
moved to the position shown in FIG. 4 and the switch is
teeth of ratchet ‘il until the ratchet and sleep cam 26 are
opened. During the operation of the sleep mechanism,
42 is positioned between the ratchet 4l and the time cam
i3 for permitting cam ll?) to move the ratchet one incre 60 the time may be extended or reduced or eliminated en
ment approximately every eight minutes. As illustrated
more particularly in FIG. 5, pawl ¿i2 may be formed
from a single piece of sheet metal and provided with an
enlarged opening 43 for receiving a spacer stud lli-’E- upon
which it is pivotally and slidably mounted. The pawl in 65
tirely by turning control knob 28 in the proper direction.
Any such adjustment simply rotates ratchet 4l and slides
cam 26 on the surface of arm 24 of the switch to change
the time interval setting. With this ararngement a unique
low cost sleep switch mechanism may be uniquely and
easily combined with apparatus such as a battery oper
ated timer provided with a spring driven escapement and
pendicular to arm 4S for providing an operative connec
a small electric motor for winding the spring.
tion between time cam 13 and ratchet 41. The top and
While there has been shown and described a particular
bottom portions 47 and ¿i3 of arm 46, are bent generally
perpendicular with respect to the plane of the arm for 70 embodiment of this invention, it will be obvious to those
skilled in the art that various other changes and modifi
providing smooth operative connection with the time cam
cations can be made therein without departing from the
13 andthe ratchet 4l, respectively. A spring 49 is looped
invention, and therefore, it is aimed in the appended
over a support nut 69’ of the timer supporting structure
claims to cover all such changes and modifications as fall
with one end secured to a tab 5@ which may be formed
in rear plate 2 and the other end engaging a lug 5l 75 within the true spirit and scope of the invention.
cludes an arm 4S and an arm do arranged generally per
3,078,358
5
What we claim as new and desire to secure by Letters
Patent of the United States is:
1. A time switch comprising: means periodically ro
tated by a timing mechanism, a switch, a switch lever for
6
positions for holding the switch closed and rotatable to
another position for permitting the switch lever to open
the switch, a ratchet fixed to said control shaft, said pawl
being located adjacent to said ratchet for moving said
opening and closing said switch, a manually positionable
ratchet and said sleep switch cam from any one of the
control shaft, a cam mounted on to said control shaft for
preselected rotary positions for holding the switch closed
toward said other position for permitting the switch lever
moving said switch lever, said control shaft and said cam
to open the switch.
being manually selectively positionable in any one of a
6. A :time switch comprising: a time cam periodically
plurality of adjustable positions for holding the switch
closed and po-sitionable in another position for permitting 10 rotated by a timing mechanism, a pawl located adjacent
the switch lever to open the switch, said periodically ro
tated means being operatively connected to said control
shaft for moving said cam from any one of the preselected
positions for holding the switch closed toward said other
position for permitting the switch lever to open the switch.
Z. A time switch comprising: timed means for periodi
cally winding a timer, a switch, a switch lever for open
ing and closing said switch, a manually positionable con
to said time cam for actuation thereby, spring means for
biasing sai-d pawl into contact with said time cam, a
switch, a switch lever for opening and closing said switch,
a manually rotatable control shaft, a sleep cam fixed to
said control shaft in -slidable engagement with said switch
lever for moving said switch lever to open or close the
switch, said control shaft and said sleep cam being man
ually selectively positionable in any one of a plurality of
trol shaft, a cam mounted on to said control shaft for
rotary adjustable positions for holding the switch closed
plurality of adjustable positions for holding the switch
closed and positionable in another position for permitting
shaft, said pawl being located adjacent to said ratchet for
incrementally moving said ratchet and said sleep switch
moving said switch lever, said control shaft and said cam 20 and rotatable to another position for permitting the switch
lever to open the switch, a ratchet fixed to said control
being manually selectively positionable in any one of a
the switch lever to open the switch, said timed means for
cam from any one of the preselected rotary positions for
to said control shaft for moving said cam from any one of
permitting the switch lever to open the switch.
7. A time switch comprising: a time cam periodically
rotated by a timing mechanism, a supporting stud, a pawl
periodically winding a timer being operatively connected 25 holding the switch closed toward said other position for
the .preselected positions for holding the switch closed
toward said other position for permitting the switch lever
to open the switch.
loosely pivoted on said stud, said pawl being located adja
shaft and said sleep cam being manually selectively posi
selectively positionable in any one vof a plurality of rotary
adjustable positions for holding :the switch closed and
rotatable to another position for permitting the switch
3. A time switch comprising: a time cam periodically 30 cent to said time cam for actuation thereby, a switch, a
switch lever for opening and closing said switch, a man
rotated by a timing mechanism, a pawl located adjacent
ually rotatable control shaft, a sleep cam fixed to said
to said time cam for actuation thereby, a switch, a switch
control shaft in slidable engagement with said switch lever
lever for opening and closing said switch, a manually ro
for moving said switch lever to open or close the switch,
tatable control shaft, a sleep cam mounted on to said
control shaft for moving said switch lever, said control 35 said control shaft and said sleep- cam being manually
tionable in any one of a plurality of rotary adjustable
positions -for holding the switch closed and rotatable to
another position for permitting the switch lever to open
the switch, a ratchet mounted on said control shaft, said 40
lever to open the switch, a ratchet fixed to said control
pawl being located adjacent to said ratchet for increment
ally moving said ratchet and said sleep switch cam from
any one of the preselected rotary positions for holding
the switch closed toward said other position for permitting
shaft, said pawl being located adjacent to said ratchet for
incrementally moving said ratchet and said sleep switch
from any one of the preselected notary positions for hold
ing the -switch closed toward said other position for per
mitting the switch lever to open »the switch,
the switch lever to open the switch.
4. A time switch comprising: a time cam periodically
rotated by a timing mechanism, a pawl located adjacent
rotated by a timing mechanism, a pawl located adjacent
to said time cam for actuation thereby, a switch, a switch
8. A time switch comprising: a time cam periodically
to said time cam for actuation thereby, a switch, a switch
lever for opening and closing said switch, a manually
rotatable control shaft, a sleep cam fixed to said control
50 shaft for moving said switch lever, a curved surface
tatable control shaft, a sleep cam fixed to said control
formed on said sleep cam for holding said switch lever
shaft in s-lidable engagement with said switch lever for
in aclosed position, a flat surface formed on said sleep
moving said switch lever to open or close the switch, said
cam for cooperating with said switch lever to permit the
control shaft and said sleep cam being manually selective
switch «lever to be moved to an open position, a ratchet
ly positionable in any one of a plurality of rotary adjust
fixed to said control shaft, said pawl being located adja
lever for opening and closing said switch, a manually ro
able positions for holding the switch closed and rotatable
to another position for permitting the switch lever to open
the switch, a ratchet mounted on said control shaft, said
cent to said ratchet for incrementally moving said ratchet
and said sleep switch cam from any position wherein the
curved surface of said cam holds the switch closed toward
the position wherein the switch lever is located on said
ly moving said ratchet and said sleep switch cam from any 60 ñat surface to open the switch.
one of the preselected rotary positions for holding the
switch closed toward said other position for permitting
References Cited in the file of this patent
the switch lever to open the switch.
UNITED STATES PATENTS
5. A time switch comprising: a ltime cam periodically
2,555,508
Pudelko _______________ __. June 5, 1951
rotated by a timing mechanism, a pawl located adjacent
pawl being located adjacent to said ratchet for periodical
to said time cam for actuation thereby, a switch, a switch
2,579,260
lever for opening and closing said switch, a manually
2,938,970
Constantine __________ __,..- May 31, 1960
rotatable control shaft, a sleep earn fixed to said control
shaft in slidable engagement with said switch lever to
move said switch lever to lopen or close said switch, spring
means connected to said switch lever for biasing said
switch lever into contact with said sleep cam, said control
2,941,051
2,946,902
2,964,933
Laviana ______________ _.. June 14, 1960
Hagan _______________ __ July 26, 1960
Fritz ________________ _.. Dec. 20, 1960
620,813
Great Britain _________ __ Mar. 30, 1949
shaft and said sleep cam being manually selectively posi
tionable in any one of a plurality of rotary adjustable
Horgan ______________ __ Dec. 18, 1951
FOREIGN PATENTS
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