US3610753A - Timer for controlling the operation of devices and implements, especially stoves - Google Patents

Timer for controlling the operation of devices and implements, especially stoves Download PDF

Info

Publication number
US3610753A
US3610753A US874469A US3610753DA US3610753A US 3610753 A US3610753 A US 3610753A US 874469 A US874469 A US 874469A US 3610753D A US3610753D A US 3610753DA US 3610753 A US3610753 A US 3610753A
Authority
US
United States
Prior art keywords
timer
mechanism according
dial
timer mechanism
gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US874469A
Other languages
English (en)
Inventor
Josef Neubauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diehl Verwaltungs Stiftung
Original Assignee
Diehl GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diehl GmbH and Co filed Critical Diehl GmbH and Co
Application granted granted Critical
Publication of US3610753A publication Critical patent/US3610753A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C23/00—Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals
    • G04C23/14—Mechanisms continuously running to relate the operation(s) to the time of day
    • G04C23/16—Mechanisms continuously running to relate the operation(s) to the time of day acting only at one preselected time or during one adjustable time interval
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C23/00—Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals
    • G04C23/02—Constructional details
    • G04C23/06—Driving or regulating means

Definitions

  • a planetary gear arrangement interconnects the dial and the pointer and adjusts one of a pair of clutch elements, the other of which is driven by the timer motor. Adjustment of the dial presets a power control device and when the clutch parts are in a certain relative position they clutch together and initiate the supply of power to the appliance, and which is automatically terminated when the preselected time expires.
  • PATENTEU 0m 5 l9 Please sum 1 OF 3 IN VEN TOR. J05EF NEUBAUER.
  • the present invention relates to a timer for controlling the operation of devices and implements, especially stoves.
  • the operation concerns a device for kitchen stoves with means for setting the end of a cooking period, the duration of a cooking period, a particularly short cooking period, and the start of the cooking period while indicating means are provided for the three last-mentioned setting means.
  • the device is furthermore provided with a planetary gear transmission for calculating and setting the time for the start of the cooking period from the present termination of the cooking period and the duration of the cooking period.
  • the device also comprises a drive for the timer which simultaneously furnishes the energy for the mechanical control operations and furthermore comprises electric control means for controlling the functions of the device.
  • a timer of this type for use in kitchen stoves is known.
  • Such known timers comprise a total of three actuating shafts for setting the time of day for the timer, for setting the cooking 7 duration, and for setting a particularly short cooking period while the actuating shaft for the timer is additionally equipped with a hollow shaft for setting the end of the cooking period.
  • the duration of the cooking period and the particularly short cooking period there are provided a total of three indicating devices.
  • timer The most important feature of such a timer is its planetary gear transmission by means of which after having set the end of the cooking period and the cooking duration, the start of the cooking period is automatically set in the timer so that the person operating the stove does under no circumstances have to make time consuming calculations in this respect.
  • the timer requires a considerable space in view of the fact that three actuating shafts are arranged adjacent to each other including the pertaining indicating devices.
  • FIG. I is a front view of a timer according to the invention.
  • FIG. 2 is a diagrammatic illustration for purposes of explaining the function of the timer according to the invention.
  • FIG. 3 is a lateral section through the timer according to the invention while the transmission for setting the time for a particularly short cooking period has been omitted.
  • FIG. 4 is a lateral section similar to that of FIG. 3 while only the transmission for the setting of a particularly short cooking period is illustrated.
  • FIG. 5 is a top view of the transmission of FIG. 4.
  • FIG. 6 is a perspective view of the structures shown in FIGS. l5.
  • the present invention is characterized primarily in that a timer is mounted on the front plate of the stove while a first actuating shaft for setting the end of the cooking period is provided which carries a hollow shaft for setting a particularly short cooking period.
  • the invention is furthermore characterized in that a second actuating shaft for setting the beginning of the cooking period is provided and carries a hollow shaft for setting the cooking period.
  • the invention is furthermore characterized in that the first actuating shaft with the indicating device for the cooking period and the hollow shaft mounted on said first actuating shaft and provided with an indicating device for the particularly short cooking period and the hollow shaft on the second actuating shaft are mechanically connected or coupled to the indicating device for the cooking time.
  • the number of the actuating shafts is reduced. This in turn permits a considerable decrease in the overall size of heretofore known timers inasmuch as in view of the new arrangement of the actuating shafts simultaneously also the gear transmission arranged behind the front plate can be compacted to a considerable extent.
  • the indicating device for the end of the cooking period consists of an indicator which by means of a hollow shaft is arranged on the shaft of the timer. Consequently, no indicating device for the end of the cooking period is necessary which would require a space of its own.
  • the indicating devices for the cooking period and for the particularly short cooking period respectively consist of an indicating disc with corresponding numbers which are partly visible behind a window of the front plate. These indicating devices are similar to the indicator for the end of the cooking period coupled through gears with the actuating shafts and the hollow shafts arranged thereon.
  • the indicating discs for the cooking period are also coupled to the drive for the timer in such a way that the discs rotate with the expiration of the set time in a direction counter to the setting direction so that always the time still left is indicated.
  • the first actuating shaft (end of the cooking period) is through driving means operatively connected to the sun wheel of the planetary gear transmission while the hollow shaft on the second actuating shaft (cooking time) is coupled to the outer wheel of said planetary gear transmission.
  • the planetary gear wheel is operatively connected to coupling means which at the start of the cooking period actuate an electric switch for the supply of current, and connect the planetary gear transmission to the drive for the timer.
  • the outer wheel of the planetary gear transmission cooperates with a control lever which at the end of the cooking period-a certain position of the outer wheel being associated with the control lever-actuates an electric breaker for the current supply and furthermore through the intervention of the coupling means separates the planetary gear transmission from the drive for the timer.
  • the coupling means comprises an axially displaceable coupling disc provided with a bore or groove and also comprises a clutch jaw connected to the planetary gear which jaw cooperates with the bore or groove of the coupling disc in a positive manner when the clutch is engaged.
  • a brake between the sun wheel of the planetary gear transmission and the first actuating shaft which brake has such a braking moment that on one hand the driving energy of the drive for the timer will not be sufi'rcient to turn the sun wheel while on the other hand a setting of the end of the cooking period through the first actuating shaft will be possible without difficulties.
  • FIG. 1 illustrates the dial face of the timer I mounted on a front plate F.
  • the timer furthermore comprises a pointer 2 for indicating the hours and a pointer 3 for indicating the minutes while the seconds are indicated by the pointer 4.
  • a setting indicator 5 For purposes of setting the end of the cooking period, there is provided a setting indicator 5.
  • the actuation of the functions of the timer is effected by a total of four control knobs arranged on two double shafts.
  • the knob 6 By means of the knob 6 the end of the cooking period is set while at the same time the adjusting indicator 5 is moved.
  • a knob 7 a timer for a particularly short cooking period is set which at the expiration of said short time sounds off.
  • the setting of the pointers 2 and 3 is effected by a knob 8.
  • a fourth knob 9 serves for setting the intended cooking duration.
  • two indicating devices 10 and 11 with dials visible through a window 10' and 11; of the front plate F.
  • the arrangement of the indicating dials is such that the respective still remaining time of the set time is indicated.
  • a coupling disc 20 rotates synchronously with the hour wheel 2 of the timer, said coupling disc being provided with a cutout 21.
  • a clutch jaw 22 is by means of a differential turned to the same extent.
  • the cooking period is set while the outer wheel is turned in the direction of the arrow 24.
  • a cam switch 25 cooperating with a groove 26 provided at the circumference of the outer wheel 23 serves for controlling the electric functions of the kitchen stove.
  • the numbering provided on the outer wheel 23 is in this figure shown merely for facilitating the understanding.
  • the timer for a freely selected example. It may be assumed that at the time of day shown in FIG. 1, namely 4:48 PM, the timer is started and the end of the cooking period is to be set for 7 PM while the cooking period proper should be one hour.
  • the setting knob 6 the indicating pointer 5 and together with the latter the clutch jaw 22 is set for the time 7 PM (position 22 in FIG. 2).
  • the outer wheel 23 is by means of the knob 9 turned in the direction of the arrow 24 by one hour which means that the number one on the outer wheel 23 occupies the position where previously the number 12 had been.
  • the coupling jaw 22 is turned back from its position 22' by a corresponding angle to the position 22" and now indicates the start of the cooking period.
  • the release lever 25 was also lifted out of the groove 26.
  • the clutch disc with the recess 21 moves in clockwise direction and eventually reaches the time 6 PM.
  • the clutch jaw 22 which occupies the position 22" drops into the recess 21 and is by means of the clutch disc 20 positively taken along. Due to the dropping of the clutch jaw 22 into the cutout 21, simultaneously the current supply to the kitchen stove is turned on.
  • the outer wheel 23 is turned counter to the direction of the arrow 24 until the time of 7 PM has been reached.
  • the release lever 25 drops back into the groove 26 and thus turns off the current supply to the stove. Furthermore the clutch jaw 22 is again lifted out of the cutout 21.
  • FIG. 3 The shafts on which the knobs 6-9 referred to in connection with FIG. 1 are arranged are designated with the reference numerals 6'9.
  • the remaining structural elements referred to and discussed in FIGS. 1 and 2 are in FIG. 3 designated with the same reference numerals as in FIGS. 1 and 2.
  • the gear train for setting a particularly short cooking time by means of shaft 7' with the gear 30 has been omitted in FIG. 3 to avoid clogging up the latter and is illustrated separately in FIGS. 4 and 5.
  • Shaft 6' has mounted thereon a gear 31 which meshes with the gear 32.
  • the pointer 5 for indicating the end of the cooking period is connected to the shaft 33 of gear 32 which shaft 33 forms a hollow shaft and is arranged on the shaft of the pointers 2, 3 and 4.
  • a braking disc 35 provided with a brake liner is pressed against the gear 32 by means of two springs 34 resting against the front plate F. This braking disc exerts upon the gear 32 and thereby the pointer 5 such a braking moment that while it is possible to turn the pointer 5 manually through shaft 6', a turning of the pointer 5 by the drive of the timer will not be possible.
  • a gear 36 which is connected to the main shaft 37 of the planetary gear transmission meshes with the gear 32.
  • This planetary gear transmission comprises the above-mentioned outer wheel 23 which is freely journaled on shaft 37 and has inner and outer teeth.
  • the planetary gear transmission furthermore comprises a sun wheel 38 connected to shaft 37, and also a planetary gear wheel 39 arranged between the sun wheel 38 and the inner teeth of the outer wheel 23.
  • Planetary gear wheel 39 is rotatably mounted on a disc 40 which latter is freely rotatable on shaft 37.
  • Disc 40 has fixedly connected thereto the above mentioned clutch jaw 22.
  • Axially displaceably mounted on shaft 37 is the above mentioned clutch disc 20 with the cutout 21.
  • This clutch disc 20 is driven through a gear41 which is operatively connected to the drive for the timer.
  • the clutch disc 20 is by a force 42' pressed against the clutch jaw 22 against the thrust ofa spring 43.
  • the setting of the pointers 2 and 3 is effected through shaft 8 and a gear 44.
  • Shaft 9' has mounted thereon a gear 45 which on one hand meshes with the indicating disc 11 visible through a window 11' in the front plate F and intended for the cooking period and on the other hand with the outer teeth of the outer gear 23 of the planetary gear transmission.
  • the drive for the timer drives also the gear 41 as mentioned above so that the clutch wheel 20 will rotate synchronously with the expiring time.
  • the clutch wheel 20 due to the pressure exerted by the relief lever 42 is displaced against the thrust of the spring 43 and will when turned further positively engage and move the clutch jaw 22 and disc 40.
  • the planetary gear wheel will in view of the movement of the disc 40 continue to roll on the inner teeth of the outer wheel 23 while the sun wheel 38 remains braked fast and now turns back the indicating disc 11 through the intervention of the outer wheel 23 and the gear 45.
  • the relief lever 25 drops into the groove 26 on the outer wheel 23 (FIG.
  • the setting of a short cooking period will be evident from FIGS. 4 and 5.
  • the indicating disc 10 which is provided with numbers and which is visible from the outside through a window in the front plate F meshes with the gear 30 connected to the hollow shaft 7'.
  • a gear 51 and a cam disc 52 Connected to the shaft 50 of disc 10 is a gear 51 and a cam disc 52.
  • the gear 51 meshes with a gear 53 which is freely rotatable on a shaft 54.
  • This gear 53 through a clutch liner 55 cooperates with a disc 56 connected to shaft 54.
  • a spring 57 which is coaxially arranged with shaft 54 and rests against a disc 58 connected to the shaft 54.
  • a nose 61' of a lever 61 pivotable about a shaft 60 cooperates with a groove 59 in the cam disc 52.
  • Lever 61 is under the influence of a force acting in the direction indicated by the arrow 62.
  • the free end of lever 61 is provided with a member 63 which is adapted to hit against a bell 64.
  • the gear 51 is within the range between the teeth 51 and 51" free from teeth to disengage the timer for setting a short cooking period from the shaft 54 which is driven by the drive for the timer when no short cooking period has been set.
  • the clutch on the shaft 54 serves for making possible the setting of a very short cooking period via shaft 7' without simultaneously damaging the drive running in the opposite direction.
  • a timer mechanism especially for use with appliances such as cooking stoves, comprising: a frame with a clock, first manual means for adjusting the end of a time period with a pointer, second manual means in coaxial relation to the first manual means for adjusting a short-time period, third manual means for adjusting the time, fourth manual means in coaxial relation to that third manual means for adjusting a selected time period which is to end at the time indicated by the pointer, the second manual means being mechanically con nected with a first dial for indicating the short time period and the fourth manual means being mechanically connected witha second dial indicating the said time period, the said clock having a face and hands, a tubular shaft telescoping the shafts for said hands, the said pointer being mounted on said tubular shaft and indicating the end ofthe selected time period on said clock face, a clutch having a first disc driven by the driven shaft means of the clock and also having a second disc coaxial with said first disc, a spring urging said discs apart and clutch actuating means oper
  • a timer mechanism which includes a clock in said frame having a face and hands, and a tubular shaft telescoping the shafts for said hands, said pointer being mounted on said tubular shaft and indicating the end of the selected time period on said clock face.
  • a timer mechanism in which said frame has a front portion, said clock face and first dial being observable from front of said frame, said first and fourth manual means comprising first and second knobs respectively at the front portion of said frame.
  • a timer mechanism according to claim 3, a said second manual means being in the form of a second knob connected to said first dial for rotation thereof, timer further includes friction drive means for connecting said first dial with said timer driven shaft means, said first dial being disengaged from said friction drive means in one adjusted position only of the first dial, and signal means actuated by said first dial in response to movement thereof into said one position.
  • a timer mechanism according to claim 4, wherein said third manual means includes a third knob for adjusting said clock hands, said first and second knobs being arranged in coaxially relation at said front panel, and said second and third knobs being arranged in coaxial relation at said front panel in spaced relation to said first and third knobs.
  • a timer mechanism in which said frame has a front panel with a window formed therein for said clock face and with apertures therein through which marginal regions of said first and second dials are visible.
  • a timer mechanism in which said first and second dials have gear teeth, and gears meshing with said gear teeth and connected to the respective knobs.
  • a timer mechanism in which the first and second dials are moveable by the respective knobs therefor away from a zero position into position to indicate respective time periods and are moved in the direction of decreasing time display by said timer driven shaft means.
  • a timer mechanism in which the said first and second dials and the respective viewing apertures therefor are adjacent the respective knobs.
  • a timer mechanism according to claim 4 in which coaxial ones of said knobs are mounted on telescoping rotary shafts.
  • a timer mechanism in which said first element of said planetary gear drive is the planet gear and a shaft mounted on said second disc rotatably supports said planet gear, said second element comprising the sun gear and means connecting the sun gear to said pointer and said first manual means, said third element comprising the ring gear, and means connecting said ring gear to said cam and to said first dial and to said second manual means.
  • a timer mechanism in which said cam is coaxial with and mounted on said ring gear.
  • a timer mechanism in which said cam is circular with a single peripheral notch therein, said control arm having a follower bearing on the periphery of said cam and receivable in said notch.
  • a timer mechanism in which the resistance offered to rotation of said pointer and sun gear by said friction means is adequate to prevent rotation of said sun gear when said planetary gear is driven about the sun gear by rotation of said second disc and also when said ring gear is rotated by said second manual means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Predetermined Time Intervals (AREA)
  • Electromechanical Clocks (AREA)
US874469A 1968-11-07 1969-11-06 Timer for controlling the operation of devices and implements, especially stoves Expired - Lifetime US3610753A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE6805821U DE6805821U (de) 1968-11-07 1968-11-07 Zeitschaltuhr zur zeitlichen steuerung der funktionen von geraeten, insbesondere kochherden.

Publications (1)

Publication Number Publication Date
US3610753A true US3610753A (en) 1971-10-05

Family

ID=6595552

Family Applications (1)

Application Number Title Priority Date Filing Date
US874469A Expired - Lifetime US3610753A (en) 1968-11-07 1969-11-06 Timer for controlling the operation of devices and implements, especially stoves

Country Status (6)

Country Link
US (1) US3610753A (enrdf_load_stackoverflow)
CH (2) CH516841A (enrdf_load_stackoverflow)
DE (1) DE6805821U (enrdf_load_stackoverflow)
FR (1) FR2022801A1 (enrdf_load_stackoverflow)
GB (1) GB1258010A (enrdf_load_stackoverflow)
NL (1) NL6916658A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857234A (en) * 1973-08-20 1974-12-31 Robertshaw Controls Co Digital timer means and method of making the same
US3930131A (en) * 1974-02-14 1975-12-30 Tamura Electric Works Ltd Timer for controlling the operation of electrical devices
US3930359A (en) * 1973-08-20 1976-01-06 Robertshaw Controls Company Digital cooking timer means having concentric time indicator disc and manual readout indicator
US3932723A (en) * 1973-04-20 1976-01-13 Tokyo Shibaura Electric Co., Ltd. Electronic range with automatic electronic digital timer
US3969886A (en) * 1971-06-30 1976-07-20 Kabushiki Kaisha Daini Seikosha Digital electronic watch for displaying both time and the time remaining within a preselected time period
US4005571A (en) * 1975-11-06 1977-02-01 Emanuel Wolff Elapsed time reminder with conversion of calendar days into elapsed time
US4022075A (en) * 1974-11-11 1977-05-10 P. R. Mallory & Co., Inc. Interval timer
US4062180A (en) * 1975-07-31 1977-12-13 Joseph Meshi Electronic chess clock
US5253231A (en) * 1990-10-22 1993-10-12 Eta Sa Fabriques D'ebauches Braking arrangement for a gear wheel
US6713730B1 (en) 2001-09-14 2004-03-30 Zahra M. Zakerin Timing system
US20090050458A1 (en) * 2007-08-22 2009-02-26 Ezra Gmul Tukachinsky Timer for operating electric appliances at Saturday and Holyday accordind to Jewish religious law
US20100054091A1 (en) * 2006-11-21 2010-03-04 Christophe Claret S.A. Ringing mechanism
US9556939B2 (en) 2015-05-13 2017-01-31 Whirlpool Corporation Multi-function appliance knob incorporating multiple rotation modulating mechanisms
US9631700B2 (en) 2015-05-13 2017-04-25 Whirlpool Corporation Multi-function appliance knob incorporating multiple rotation modulating mechanisms
USD806512S1 (en) 2016-12-22 2018-01-02 Whirlpool Corporation Knob
USD808243S1 (en) 2016-12-28 2018-01-23 Whirlpool Corporation Knob
USD824237S1 (en) 2016-12-28 2018-07-31 Whirlpool Corporation Knob

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098131A (en) * 1960-08-17 1963-07-16 Int Register Co Timing mechanism

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098131A (en) * 1960-08-17 1963-07-16 Int Register Co Timing mechanism

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969886A (en) * 1971-06-30 1976-07-20 Kabushiki Kaisha Daini Seikosha Digital electronic watch for displaying both time and the time remaining within a preselected time period
US3932723A (en) * 1973-04-20 1976-01-13 Tokyo Shibaura Electric Co., Ltd. Electronic range with automatic electronic digital timer
US3930359A (en) * 1973-08-20 1976-01-06 Robertshaw Controls Company Digital cooking timer means having concentric time indicator disc and manual readout indicator
US3857234A (en) * 1973-08-20 1974-12-31 Robertshaw Controls Co Digital timer means and method of making the same
US3930131A (en) * 1974-02-14 1975-12-30 Tamura Electric Works Ltd Timer for controlling the operation of electrical devices
US4022075A (en) * 1974-11-11 1977-05-10 P. R. Mallory & Co., Inc. Interval timer
US4062180A (en) * 1975-07-31 1977-12-13 Joseph Meshi Electronic chess clock
US4005571A (en) * 1975-11-06 1977-02-01 Emanuel Wolff Elapsed time reminder with conversion of calendar days into elapsed time
US5253231A (en) * 1990-10-22 1993-10-12 Eta Sa Fabriques D'ebauches Braking arrangement for a gear wheel
US6713730B1 (en) 2001-09-14 2004-03-30 Zahra M. Zakerin Timing system
US7965585B2 (en) * 2006-11-21 2011-06-21 Christophe Claret Sa Ringing mechanism
US20100054091A1 (en) * 2006-11-21 2010-03-04 Christophe Claret S.A. Ringing mechanism
US20090050458A1 (en) * 2007-08-22 2009-02-26 Ezra Gmul Tukachinsky Timer for operating electric appliances at Saturday and Holyday accordind to Jewish religious law
US8067706B2 (en) * 2007-08-22 2011-11-29 Ezra Gmul Tukachinsky Timer for operating electric appliances at Saturday and Holyday according to Jewish religious law
US9556939B2 (en) 2015-05-13 2017-01-31 Whirlpool Corporation Multi-function appliance knob incorporating multiple rotation modulating mechanisms
US9631700B2 (en) 2015-05-13 2017-04-25 Whirlpool Corporation Multi-function appliance knob incorporating multiple rotation modulating mechanisms
US10372154B2 (en) 2015-05-13 2019-08-06 Whirlpool Corporation Multi-function appliance knob incorporating multiple rotation modulating mechanisms
US10379569B2 (en) 2015-05-13 2019-08-13 Whirlpool Corporation Multi-function appliance knob incorporating multiple rotation modulating mechanisms
USD806512S1 (en) 2016-12-22 2018-01-02 Whirlpool Corporation Knob
USD808243S1 (en) 2016-12-28 2018-01-23 Whirlpool Corporation Knob
USD824237S1 (en) 2016-12-28 2018-07-31 Whirlpool Corporation Knob

Also Published As

Publication number Publication date
CH516841A (de) 1971-05-28
DE6805821U (de) 1969-03-20
FR2022801A1 (enrdf_load_stackoverflow) 1970-08-07
NL6916658A (enrdf_load_stackoverflow) 1970-05-11
GB1258010A (enrdf_load_stackoverflow) 1971-12-22
CH1645269A4 (enrdf_load_stackoverflow) 1971-05-28

Similar Documents

Publication Publication Date Title
US3610753A (en) Timer for controlling the operation of devices and implements, especially stoves
US2721441A (en) Switch and alarm clock
US2545617A (en) Timer mechanism
US1982495A (en) Clock and interval timer
US2505573A (en) Time switch with multiple manual and automatic controls
US2587026A (en) Time switch
US3098131A (en) Timing mechanism
US2977433A (en) Radio clock mechanism
US4104866A (en) Timepiece
US2301942A (en) Timing mechanism
US3910362A (en) Timer
US2783835A (en) Timer mechanism
US2782274A (en) Low cost clock switch
US3083272A (en) Oven control means
US3609956A (en) Numerically indicating timekeeper attached with timer and/or alarm
US2450287A (en) Range timer
US2257291A (en) Timing device
US3738098A (en) Alarm clock with hour and minute presetting
US3736799A (en) Dual range manual preset timer
US4098069A (en) Digital clock with timer
US4362391A (en) Watch with a calendar display and hand setting device actuated by a setting shaft
US2361262A (en) Timing apparatus
US2092715A (en) Time controlled annunciator
US4091608A (en) Timer clock
US3714457A (en) Time delay switching system with improved twenty-four hour controller