US3643421A - Electric alarm clock with illuminable face - Google Patents

Electric alarm clock with illuminable face Download PDF

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Publication number
US3643421A
US3643421A US861902A US3643421DA US3643421A US 3643421 A US3643421 A US 3643421A US 861902 A US861902 A US 861902A US 3643421D A US3643421D A US 3643421DA US 3643421 A US3643421 A US 3643421A
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United States
Prior art keywords
wheel
hour
alarm
contact
contacts
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Expired - Lifetime
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US861902A
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English (en)
Inventor
Friedrich Herr
Jurgen King
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UHRENFABRISK SENDER GmbH
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UHRENFABRISK SENDER GmbH
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/20—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by closing a contact to ring an electromechanical alarm
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/36—Signal repeating devices

Definitions

  • a second pair of contacts in series with the first-mentioned pair is closerble on axial shifting of the hour-wheel into the alarm wheel.
  • a contact-breaking arm of nonconductive material can be pushed between these second contacts and is clamped by them there until the hour-wheel is automatically cammed out of and away from the alarm wheel, whereupon the contactbreaking arm is released.
  • Depression of a button on the clock lights a lamp for illuminating the clock dial face and can shift the contact-breaking arm toward the second contacts to open same.
  • Means is provided to prevent pivoting of the contactbreaking arm between the contacts except when the teeth of the hour-wheel are engaged fully in the holes in the alarm wheel 26 Claims, 12 Drawing Figures PAIENIEBFEB22 m2 3.643.421
  • the present invention relates to an electrical alarm clock having an electrically illuminated dial.
  • Electric alarm clocks known in the art have the disadvantage that their mechanism is greatly complicated by the elements which limit the length of the alarm ringing or buzzing.
  • the great complexity of these elements makes the clock more liable to breakdown while increasing its cost. What is more, such elements take up a good deal of space, thereby making them impractical for very small alarm clocks, such as the portable alarm clocks used on trips.
  • Another known type of alarm clock has an actuating element which serves both to stop the alarm and to light a lamp which illuminates the face or dial of the clock. It was found, however, that when the user frequently wakes up and looks at the clock, actuating the button to illuminate the face, he periodically does this just at the moment when the alarm is supposed to sound. In this case, the alarm does not sound and the user is quite liable to go back to sleep without having been awakened.
  • a more specific object is to provide such an alarm clock which has a gear wheel which moves axially and thereupon triggers the alarm.
  • Another object is to provide such a clock which need not be periodically reset and which resets itself automatically.
  • Yet another object is to provide an alarm clock having a common actuating element for the dial illumination and for stopping the alarm which overcomes the disadvantages of the above-mentioned arrangements.
  • an alarm clock having means for automatically resetting the alarm mechanism once the alarm has stopped sounding or otherwise signaling the user.
  • the actuating element for stopping the alarm also serves to illuminate the dial face, but means is provided for preventing the actuating element from stopping the alarm from sounding if this element is actuated prior to the start moment of the alarm. (Although the alarm is here always referred to as some sort of acoustic signal, it is to be understood that any of a multitude of optical or tactile or other alarms are well within the scope of the invention.)
  • the hour wheel of the alarm clock serves to actuate a pair of series contacts which in turn trigger the alarm.
  • One of the sets of contacts is closed by an axial shifting of the hour-wheel while the other set of contacts is closed by a rotation of this wheel.
  • the above-mentioned actuating element is connected to an arrangement which simply opens one of these sets of contacts.
  • the hour-wheel shifts axially toward the alarm set wheel to close all the contacts and is shifted axially away from this wheel by its own rotation to open them again and stop the alarm.
  • the hour-wheel slips axially toward the alarm-set wheel in two steps: a first step where it makes contact therewith and closes the one set of contacts, and a second step where it is shifted yet closer to the alarm-set wheel and opens this set of contacts.
  • the hour-wheel is molded of synthetic resin with at least one, preferably three, teeth on the face turned toward the alarm-set wheel. These teeth all have a straight flank directed away from the hour-wheel direction of rotation and a relatively shallow flank directed in the other rotational sense.
  • the alarm-set disk is provided with matching openings in which the teeth can all engage simultaneously.
  • the hour wheel is provided on the same face with a contact ring forming a contact tongue having an end extending substantially parallel toand slightly beyond one of the teeth.
  • the alarm-set wheel is metallic so that when the teeth drop into the holes the tongue makes an electrical contact therewith, but when the rotation of the hour-wheel pulls this prestressed tongue into the hole the contact is broken.
  • the clock according to the invention having the above features has a minimal amount of moving parts which wear very little. At the same time it offers features of much larger and more costly clocks while itself being extremely small and relatively inexpensive to produce.
  • FIGS. la-1c show various views of an alarm clock according to present invention.
  • FIG. 3 is a section through a detail of the clock according to the present invention.
  • FIGS. 4a and 4b are views of the hour wheel of the clock according to the present invention.
  • FIGS. 5a through 5d are views through another detail ofthe alarm clock according to the present invention.
  • FIG. 6 is a circuit diagram illustrating other features of the invention.
  • FIGS. la-lc is illustrated without many conventional items, drive, alarm devices, etc., for the sake of clarity; these elements are well known in the art and therefore do not need further description.
  • a front plate 1 (FIG. 16) mounts a minute shaft 2 rotatably on which a drive wheel 3 is mounted.
  • a change wheel 4 engages this wheel 3 and is journaled in the plate 1 by means of a bolt 5.
  • a pinion 6 formed unitarily with the change wheel 4 engages an hour wheel of the clock mechanism, the pinion 6 being axially long enough to engage the hour wheel even when this latter is shifted axially.
  • Another plate 8 carries the dial face 9 which has the clock numerals printed on it.
  • a bushing 10 is mounted in this plate 8 and is formed with the wheel 11 and serves to mount the bushing 12 of an alarm-hour indicator 13.
  • the hour wheel 7 is carried on the bushing 14a which in turn carries an hour hand on its front end 15a.
  • a leaf spring 14 fastened to the plate 1 urges the hour-wheel by means of a loop 15 in this spring against the alarm-hour indicator wheel 11.
  • the hour wheel 7 has on its side toward this wheel 11 several toothlike camming formations 16 with one straight and one shallow flank each, which, when the predetermined time arrives, drop into correspondingly spaced holes on the plate I], pushed by the spring 14. This predetermined time is set by a control 17 cammingly engaging the teeth of the wheel ll.
  • the alarm-hour indicating wheel 11 bears with a circular ridge 18 on the front plate 8 of the clock so that an electrical connection is made between the two.
  • FIGS. 4a and 4b show the hour-wheel 7 in detail.
  • two like, simple teeth 16, and a third tooth 19 having a radial protrusion 20 There are shown two like, simple teeth 16, and a third tooth 19 having a radial protrusion 20.
  • An annular contact disk 22 is formed with a tongue 21 which presses against the underside of the protrusion 20.
  • the hour wheel 7 is formed with an annular depression in which this disk 22 is received.
  • the disk 22 is formed with an inwardly projecting foot 23 which engages behind the tooth 19 while a plurality of clamping formations 24 prevent the disk 22 from rotating relative to the wheel 7.
  • the tongue 21 is stamped out of the ring 22 which can be held on the wheel 7 by soldering, by welding or by rivets or screws; alternatively the tongue can be plated or laminated on the wheel 7.
  • I hour-wheel 7 is formed with an axially projecting, circular ridge 26 to prevent the ring 22 from contacting the plate 11 even whenthe teeth 16, 19 are fully engaged in the holes and before. the shallow flanks 28 of these teeth start camming the disk 7 to the right in FIG. 1b.
  • two fingers 29 engage the top of the disk or hour-wheel 7 and one finger 30 engages under it, making an electrical contact with the contact ring 22 by means of a boss 41, a similar boss 40 being formed on each of the fingers 29.
  • These fingers 29 and 30 are formed unitarily of a piece of sheet metal having bent up tabs and an arm 31.
  • a short rod 32 held at each end in small blocks 34 formed on a synthetic-resin body passes through the tabs 35 and allows the fingers 29, 30 and the arm 31 to rock.
  • the arm 31 is formed on its free end with an eye 36 which is oval, as shown in FIGS. 1b, and has a bump 37.
  • a metal plate 38 clipped through the body 33 as shown in FIGS. 5a and 5d has a connecting tab 39 and acts as a contact for the bump 37.
  • FIG. 5c shows in dot-dash lines the position of the arm 31 when the wheel 7 is not engaged with teeth 16 and 19 in the disk 11.
  • the deflecting formation 36 on the arm 31 is engageable with a contact-breaking arm or member 56 as will be described below.
  • This pair of contacts 37 and 38 form the switch part of the alarm circuit which can be opened to cut off the alarm, even if the tongue 21 is still in contact with the disk 11.
  • an actuating element or button 42 is provided which is formed with an abutment 43 extending through a hole 46 in the plate 8.
  • the element 42 is pivoted at and a spring 44 is engaged at one end in a hole 51 in the plate 8 and at the other end under a tab 52 on the element 42.
  • This button or lever element 42 is also formed with an arm 47 fitted with a roller 48 engageable with a spring contact 49.
  • the plate 8 is preferably grounded to one pole of a dry cell battery and the element 42 is preferably metallic so that when the roller 48 touches the contact 49 it grounds it.
  • This contact 49 is advantageously connected to the lamp serving to illuminate the dial face so that grounding the contact 49 closes the circuit and lights the lamp.
  • depression (the up direction in FIG. la) of the button 42 lights the lamp and illuminates the dial, at all times.
  • the abutment 43 of the lever 42 is connected to a spring 53 having an end 54 engaging a contacting-breaking lever 56 pivoted at 55 on the block 33.
  • This lever 56 carries another spring 57 which engages an abutment 58 on the plate 8, and the lever 56 is of nonconducting synthetic-resin material.
  • the spring 44 urges the lever 42, as seen in FIG. la in the clockwise direction and the spring 57 similarly urges the lever 56in this direction.
  • the spring 53 urges the lever 56 in the counterclockwise direction and forces it in between the contacts 37 and 38.
  • the lever 56 is formed with a groove 61 next to a ridge 60 at its free end 59.
  • the bump 37 engages in the groove 61 and behind the ridge 60 to hold the lever 56 therebetween, in spite of the spring 57.
  • the arm 56 will not catch and will simply return to its FIG. 1a illustrated position, due to the pressure exerted by the spring 57.
  • the formation 36 serves, of course, to allow the contact arm 31 to be easily deflected by the lever 56.
  • the spring 14 is formed with an arm 62 having an end 63 in turn formed with a bent over depending tab 64 that engages through a hole 65 formed in the synthetic-resin body 33, as clearly shown in FIG. 10.
  • the spring 14 remains to the right in FIG. 1b and the tab 64 engages through the hole 65.
  • the button 42 is depressed while the hour wheel is out of engagement with the wheel 11, the tab 64 will prevent the lever 56 from slipping in between the contacts 37 and 38.
  • the spring 53 deforms to allow the button 42 to be depressed while the lever 56 merely engages the tab 64, swinging no further counterclockwise.
  • FIG. 2 shows an alternative embodiment of the present invention, common reference numerals referring to common structure.
  • the arm 56' here is molded of synthetic resin unitarily with extensions forming springs 53' and 57.
  • the bent extension 53 engages an abutment 43 formed on the actuating element 42.
  • An abutment'58' formed on the plate 8 is engaged by the spring extension 57.
  • Such a construction is extremely inexpensive and advantageous.
  • FIG. 2 shows that the spring 62 has an end 63 between one face 67 of one of the journal blocks 34 and the lever 56'.
  • the end 63' can be wedged between the lever 56 and the flange 67' of the block 34 to prevent displacement of the lever 56 into between the contacts 37 and 38.
  • This arrangement is extremely flat and easy to manufacture, while providing all the advantages of the first-described embodiment.
  • the alarm clock resets itself automatically. If left alone it will sound automatically every 12 hours for a specified period of time, then shut itself off automatically. Even when shut off by actuation of the lever 42, when the wheel 7 moves back and pulls the contacts 37 and 38 apart, the end 59 ofthe lever 56 is freed so that this latter can return to its normal position under the influence of the spring 57, and the clock is set to alarm again when the wheel 7 drops into the wheel 11.
  • the teeth 16 and 19 are all at different radial spacings outwardly from the center of the wheel 7 so that they can engage in the corresponding holes only once every l2 hours.
  • the block 33 as shown in FIGS. la and 5ac is provided with a stop 67 which serves as an abutment for the lever 56 to prevent it from passing completely through between the contacts 37 and 38. (In FIG. 2 the lever 56 is stopped by the surface 67 in the same manner.) Screws 66 hold the body 33 to the plate 8 and formations 69 fit into the plate 8 to center it surely.
  • another switch 105 or pair of contacts is provided in series with the two pairs described above which is periodically interrupted to provide an on-off acoustical or visual signal that is generally considered to be more desirable, and which saves electrical energy.
  • This additional switch is advantageously coupled to the relatively fast-moving movement 113 of the clock.
  • a metallic cylinder 106 is mounted on the rapidly rotating shaft of this movement.
  • This cylinder is provided with a pair of circumferential ridges 107, 108 of which at least one has an insulated sector.
  • a small conductive wiper 110, 111 is mounted to contact each one of these ridges.
  • These two wipers are mounted on an insulating block 112 and are wired, preferably, in series with the other two pairs of contacts. As the cylinder turns the two wipers contact the metallic cylinder and form a closed circuit; however, as soon as one or the other rides up on the insulated sector ofthe ridge so provided, the connection is broken. Several such sectors can be provided, on one or both ridges to interrupt the circuit more often.
  • these wipers are connected to printed circuitry serving to connect up all the various electrical devices in the clock.
  • the dry cell battery 100 used in the clock has one pole merely grounded to the plates 1, 8, etc. and the other pole connected to one side of the electrical movement, to one side of the dial lamp, 109 and through another switch 101 to the three pairs of in-series contacts.
  • This last-mentioned switch should be a simple SPST switch which can hold in the open or closed position and which can be actuated by the user to cut off the alarm for any desired length of time, from 12 hours to several months.
  • the user does not need an alarm clock, but only a clock for telling the time, he can override and eliminate the alarm function by opening the switch.
  • the buzzer or bell 102 of the alarm is advantageously mounted on the back plate 1 of the clock and contacts the hot" nongrounded terminal of the battery through a deformable springlike member 103.
  • the alarm on-off switch described immediately above need merely be another nonconducting, advantageously synthetic-resin body 104 which can be actuated by the user to come between the member and the terminal of the battery to disconnect the latter from each other. Displacement of this insulating body out from between the member and the battery pole or the element connected thereto will let the member drop back into contact from its own inherent resilience.
  • an alarm clock having'a dial, an electrical alarm, an electric clock drive cooperating with said dial, electrical dialillumlnating means, and an alarm circuit connected with said electrical alarm and including a first switch triggerable by said drive at a preset time to energize said alarm
  • the improvement which comprises a member actuatable for opening said switch to deenergize the alarm and to limit the duration of the alarm signal and automatically resettable thereafter; means responsive to the actuation of said member for operating the dial-illumination means; and a lever mechanism coupled with said drive and effective upon actuation of said member for the illumination of the dial simultaneously with closure of said switch at said preset time for effectuating electrical energization of said alarm and requiring release of said member and reactuation thereof to deenergize said alarm.
  • said electric clock drive comprises an axially shiftable hour-wheel and said alarm circuit comprises a first pair of contacts controlled by rotation of said hour-wheel and a second pair of contacts in series with said first pair of contacts and closable upon axial shifting of said hour-wheel, said lever mechanism being operatively connected with said hour-wheel, said member and said contacts for automatically opening the first pair of contacts upon rotation of the hour-wheel past said preset time and for opening said second contacts by axial displacement of said hour-wheel, said mechanism including an alarm-set wheel receiving said hour-wheel, and a contact-breaking lever receivable between the contacts of said second pair retained in a contact-opening position upon movement of said hourwheel axially into said alarm-set wheel but withdrawn from between said contacts of said second pair into a normal position upon axial lifting of said hour-wheel out of said alarm-set wheel.
  • said hourwheel is composed of synthetic resin and confronts said alarmset wheel along one side of said hour-wheel, said formations including teethlike dogs on said hour-wheel along the side thereof confronting said alarm-set wheel and angularly offset from one another about the axis of rotation of said hourwheel, each of said dogs having one steep flank, said formations further including an array of recesses formed in said alarm-set wheel at angular locations corresponding to those of said dogs for receiving same and enabling axial shifting of said hour-wheel upon rotation thereof relative to said alarm-set wheel, said hour-wheel being provided with an annular contact plate and said alarm-set wheel having a complementary electrical contact surface engaging said plate, said annular contact plate being provided with a contact tongue on the side thereof along which said dogs are disposed and having an end projecting beyond the steep flank of one of said dogs through a distance equal to said alarm-duration rotation arc and constructed and arranged so that said tongue is out of contact with said alarm-set wheel when said hour-wheel is lifted therefrom and so that said tongue
  • said drive is provided with a front plate
  • said mechanism further comprising a switch spring rockably mounted on said plate and electrically insulated therefrom but parallel to said plate and operatively connected to said hour-wheel and in conductive relationship therewith for rotation of said spring upon axial shifting of said hour-wheel, an abutment contact engageable by said spring upon rotation thereof, a contact-breaking lever rotatable against a restoring force to intervene between said spring and said abutment contact, and a control lever springbiased into a normal position and actuatable to displace said contact-breaking lever, said contact-breaking lever being locked in a position between said spring and said abutment contact until it is released by said spring upon lifting of said hour-wheel, said spring and said abutment contact forming said second pair of contacts.
  • dial-illuminating means comprises a third pair of contacts closed upon actuation of said member.
  • said switch-spring has an end linked with said hour-wheel and formed with three tongues including a middle tongue gripping one side and a pair of end tongues gripping the opposite side of said hour-wheel, said hour-wheel being formed with an annular contact plate in sliding engagement with at least one of said tongues.
  • said contact-breaking lever is elongated and formed from a synthetic resin with a flattened front end provided with a ridge and a groove, said contact-breaking lever being provided unitarily with a thin synthetic-resin extension, said lever mechanism further comprising a pin retaining said extension under prestress.
  • clock has a conductive housing, further comprising an electric current source having one pole connected to said housing, said alarm, said drive and said dial-illumination means, each hav ing one side electrically connected to said housing.
  • one of said dogs constitutes a drop-in tooth receivable in a corresponding recess to permit axial displacement of said hour-wheel into said alarm-set wheel, said tooth being provided with a lateral protrusion supporting said tongue.
  • lever mechanism comprises an elastic element operatively connecting said member with said contact-breaking lever.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
US861902A 1968-09-28 1969-09-29 Electric alarm clock with illuminable face Expired - Lifetime US3643421A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681798352 DE1798352A1 (de) 1968-09-28 1968-09-28 Wecker mit elektrischer Wecksignalgabe

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US3643421A true US3643421A (en) 1972-02-22

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Application Number Title Priority Date Filing Date
US861902A Expired - Lifetime US3643421A (en) 1968-09-28 1969-09-29 Electric alarm clock with illuminable face

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US (1) US3643421A (fr)
AT (1) AT300672B (fr)
CH (2) CH1468169A4 (fr)
DE (1) DE1798352A1 (fr)
FR (1) FR1603915A (fr)
GB (1) GB1253409A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000384A (en) * 1973-09-11 1976-12-28 Kabushiki Kaisha Seikosha Unlocking mechanism
US4004408A (en) * 1973-04-03 1977-01-25 Kienzle Uhrenfabriken Gmbh Mechanical improvement on an electric alarm clock
US4251878A (en) * 1977-06-30 1981-02-17 Seiko Koki Kabushiki Kaisha Switching device for battery powered alarm clock
US20030137902A1 (en) * 2002-01-18 2003-07-24 Mamoru Watanabe Hand motion irregularity suppressed timepiece
US20110205855A1 (en) * 2010-02-23 2011-08-25 Eta Sa Manufacture Horlogère Suisse Device for electromechanical watch for determining the moment at which and the direction in which a time indication has to be corrected

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015982A1 (de) * 1980-04-25 1981-11-05 Kieninger & Obergfell Fabrik für technische Laufwerke und Apparate, 7742 St Georgen Elektrische ausloesevorrichtung
DE3302638A1 (de) * 1983-01-27 1984-08-02 Braun Ag, 6000 Frankfurt Weckeruhr

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3386238A (en) * 1966-03-15 1968-06-04 Gen Time Corp Control mechanism for alarm clock

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3386238A (en) * 1966-03-15 1968-06-04 Gen Time Corp Control mechanism for alarm clock

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004408A (en) * 1973-04-03 1977-01-25 Kienzle Uhrenfabriken Gmbh Mechanical improvement on an electric alarm clock
US4000384A (en) * 1973-09-11 1976-12-28 Kabushiki Kaisha Seikosha Unlocking mechanism
US4251878A (en) * 1977-06-30 1981-02-17 Seiko Koki Kabushiki Kaisha Switching device for battery powered alarm clock
US20030137902A1 (en) * 2002-01-18 2003-07-24 Mamoru Watanabe Hand motion irregularity suppressed timepiece
US6755567B2 (en) * 2002-01-18 2004-06-29 Seiko Instruments Inc. Hand motion irregularity suppressed timepiece
US20110205855A1 (en) * 2010-02-23 2011-08-25 Eta Sa Manufacture Horlogère Suisse Device for electromechanical watch for determining the moment at which and the direction in which a time indication has to be corrected
US8454225B2 (en) * 2010-02-23 2013-06-04 ETA SA Manufacturing Horlogère Suisse Device for electromechanical watch for determining the moment at which and the direction in which a time indication has to be corrected

Also Published As

Publication number Publication date
AT300672B (de) 1972-08-10
GB1253409A (en) 1971-11-10
FR1603915A (fr) 1971-06-14
CH517967A (de) 1971-06-15
CH1468169A4 (fr) 1971-06-15
DE1798352A1 (de) 1971-08-12

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