US3168690A - Clock power-device - Google Patents
Clock power-device Download PDFInfo
- Publication number
- US3168690A US3168690A US453392A US45339254A US3168690A US 3168690 A US3168690 A US 3168690A US 453392 A US453392 A US 453392A US 45339254 A US45339254 A US 45339254A US 3168690 A US3168690 A US 3168690A
- Authority
- US
- United States
- Prior art keywords
- magnet
- coil
- transistor
- pendulum
- driving
- 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
Links
Images
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B11/00—Click devices; Stop clicks; Clutches
- G04B11/02—Devices allowing the motion of a rotatable part in only one direction
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B11/00—Click devices; Stop clicks; Clutches
- G04B11/02—Devices allowing the motion of a rotatable part in only one direction
- G04B11/04—Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C15/00—Clocks driven by synchronous motors
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/02—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum
- G04C3/027—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum using electromagnetic coupling between electric power source and pendulum
- G04C3/0276—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum using electromagnetic coupling between electric power source and pendulum the pendulum controlling indirectly, i.e. without mechanical connection, contacts, e.g. by magnetic or optic means
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/02—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum
- G04C3/027—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum using electromagnetic coupling between electric power source and pendulum
- G04C3/0278—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum using electromagnetic coupling between electric power source and pendulum the pendulum controlling the gear-train by means of static switches, e.g. transistor circuits
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/04—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance
- G04C3/06—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance
- G04C3/064—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance the balance controlling indirectly, i.e. without mechanical connection, contacts, e.g. by magnetic or optic means
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/04—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance
- G04C3/06—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance
- G04C3/065—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance the balance controlling gear-train by means of static switches, e.g. transistor circuits
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/04—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance
- G04C3/06—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance
- G04C3/065—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance the balance controlling gear-train by means of static switches, e.g. transistor circuits
- G04C3/066—Constructional details, e.g. disposition of coils
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C5/00—Electric or magnetic means for converting oscillatory to rotary motion in time-pieces, i.e. electric or magnetic escapements
- G04C5/005—Magnetic or electromagnetic means
Definitions
- This invention relates to electrical apparatus and, more particularly, electrical time-apparatus (clocks and watches) which are to be powered from a weak source of direct current such as a small cell or a storage battery; more particularly still, it relates to the prime movers of the electromagnetic impulse type which incorporates at least one movable permanent magnet.
- the apparatus of this type now in use comprises switches with intermittent electrical contacts get worn out fairly quickly andthe operation of which is irregular'and" not reliable. Moreover, the control of such switches at very precise instants require mechanisms, the design and the adjustment of which are delicate and which introduceirregular losses'of energy due to impact and friction effects, whereby the steadiness in the operation of the time mechanisms is greatly impaired.
- One object of the invention is to provide a power de- 'vice which is reliable in operation and which is of simple design incorporating no intermittent electric contacts.
- Another object of the invention is to provide a power device of small dimensionsthough highly efficient, adapted to be accommodated within a watch-case for instance.
- This invention is characterized by the fact that the electrical contact which supplies the driving electromagnet in the conventional devices is replaced by an electronic amplifier of the type known under the name of junction transistor, i.e. an amplifier with a solid body comprising no heated filament and which may be put instantaneously in operation under the action of a very small electric power, under a relatively very low voltage.
- an electronic amplifier of the type known under the name of junction transistor, i.e. an amplifier with a solid body comprising no heated filament and which may be put instantaneously in operation under the action of a very small electric power, under a relatively very low voltage.
- Such an amplifier constitutes a very consistent and sensitive relay and operates under the influence of a so-called control coil or release coil winding which is located near the movable magnet.
- This winding is connected in series with-the variable resistance between the emitting electrode and the control electrode of the transistor whereby the whole assembly forms an uninterrupted releasing circuit.
- the movement of the permanent magnet induces a weak alternating electromotive force into the control coil, and, when the voltage applied to the transistor reaches a sufficient value and the suitable sign or direction, weak currents flow in the release circuit and act upon the conduction of the transistor portion which comprises the collecting (or output) electrode in order to cause the source of electric power to send short unidirectional currents into a power electromagnet.
- the armature of this electromagnet may be constituted by the movable magnet hereinabove mentioned.
- FIG. 1 illustrates the power device according to the invention as applied for keeping a pendulum in motion
- FIG. 2 shows. in greater detail, the wiring diagram of the device illustrated in FIG. 1;
- FIGS. 3a and 3b diagrammatically illustrate, in front and side elevation views respectively, a power device according to the invention as applied to the driving of a circular balance wheel;
- FIG. 4 diagrammatically shows a rotary motor designed according to the invention and able to actuate, either directly or indirectly, the hands of a time instrument;
- FIG. 5 shows in greater details the construction of a watch with a balance wheel serving as an oscillating motor designed according to the invention.
- the electronic devices adapted to distribute the power electromagnetic impulses have been diagrammatically identified either by the general symbol ATr of an amplifier relay (comprising two input terminals 1-2, two output terminals 3-4 and a source of power G), or by the particular symbol of a sistor element Tr of the known type called PNP junction type" the electrodes of which are identified as foliows:
- FIG. 1 shows the application of. the invention to an electromagnetic clock of a known type.
- This clock has a pendulum the main weight M of which is fitted with a ferromagnetic cross bar F and a bipolar magnet A in the shape of an arc transversally arranged and the magnetic poles of which are concentrated at N, and S
- the pole N of the magnet A receives successive power impulses from a hollow coil BE which is called the sustaining coil and which is connected in a circuit comprising a cell G.
- the periodic energizing of this coil is the object of the invention.
- a stationary auxiliary coii BC which is called the control coil is arranged about the magnet A.
- the turns of this coil embrace the pole S when the pendulum is but slightly moved away from the vertical and, therefore, they are subject to a strong radial magnetic field.
- the leads of the coil BC are connected to the input terminals 1 and 2 of an amplifying relay ATr of the socalled junction transistor known type the features of which have been stated hereinabove.
- the output terminals 34 of this amplifier are connected to the stationary sustaining coil BE which embraces the pole N of the magnet, and the energy required for operation is supplied by the cell G under the condi tions hereinunder stated:
- a current I may be derived from the outputterminals 3-4 and flow through the coil BE only when the voltage U of the input signal (or control voltreaches a predetermined value with a given sign. Under such conditions, the current I is delivered every time the pendulum moves a short distance near its posh tion of equilibrium in the direction h.
- the stationary members BC and AW therefore, have the function of 3 'a self-sustaining switching mechanism .actuated by the :strokes of the pendulum in one direction only.
- the mean .electric power of the currents I delivered by the cell G is greater than the passive power consumed in inducing the releasing currents i. Under these conditions, the osciilaltions of the pendulum are sustainedand thependulum is even able to directly-actuate a chronometric counter with hands.
- the inner connections of the amplifying relay ATr may be effected in various ways, for example, use may be made of the connections already proposed for amplifying the weak currents obtained by 'means of magneto electric microphones or record players.
- FIG. 2 diagrammatically illustrates a particular schermatic for an amplifier particularly advantageous when the invention is applied to electric clocks and watches.
- a single junction transistor element Tr which,- in the example illustrated, is of the so-called PNP type provided with three terminals, ensures the periodic energization of the sustaining coil BE by means of the cell G.
- control coil BC is core nected to the electrodes b (base) ande (emitting) of the transistor while the sustaining coil BE is connected to the electrodes c (collecting) and e (emitting) through the cell G, the positive terminal of which is connected to the electrode e.
- the characteristics and the positions-of the coils BC and BE and of the transistor Tr may be selected. so as to effect an isochronal movement of a heavy power pendulum of which the amplitude of oscillation is automatically regulated by the etfect of the phenomena described in detail hereinafter.
- the magnet A may, without any disadvantage, oscillate slowly and-with a short amplitude
- E denotesthe counter-electromotive force which is set up by induction within the driving coil, andU the voltage of the source'of electricv power.
- the motor formed-by a magnet A periodically energized througha transistor, as illustrated in FIGS.'1 and2, has the feature herein above indicated and the reduction in the damping forces due to the omission 'of'theself-sustaining contact makes it possible to cause the counter-else tromotive force E included inthe coil BEto' be very near the voltage U of the cell G. Hence, the eificiency N gets nearer the maximum value 1.
- Thecurrent I delivered, according to Ohms lawz (R resistance 'of the circuit) becomes very-weak.
- the driving device illustrated in FIGS. 12 is applicable to high precision clocks constituted by a so-called free regulating pendulum (i.e. deprived of'any mechanism) cooperating with a dependent clock which actuates the hands.
- alternations of the electromotive force induced in the coil BC may successively act'upon the amplifier ATr and upon an auxiliary amplifier adapted to supply a dependent clock.
- This driving device is also suitable for sustaining the various types of oscillating'or vibrating regulating members to which it is possible to add a magnet. Particularly, it may be applied to the known type of electric watches the regulating and drivingmember of whichis constituted by a'small balance wheel, associated with a spiral spring.
- FIGS. 3a and 3b diagrammatically illustrate a device of this type.
- the oscillating balance wheel is formed by two discs A and A are made of a material with a very strong mag netic field and only the portions thereof indicated as at N 5 and N 5 arepermanently magnetized. In the other portions thereof, the groups of molecules called Weiss range are left in disorder.
- the parts A and A of the balance wheel only at the periphery thereof have-active poles N and S highly concentrated, facing each other whereby the balance wheel forms an astatic unit.
- the stationary coil adapted to set upthe-periodic signal which releases the powerimpulses is formed by a fiatcoil BCci copper wire arranged between the adjacent coaxial magnets A and A as illustrated in FIG. 3, wherein the baiance wheel associated with the spiral spring 5 is shown in its rest or equilibrium. position.
- the amplifier ATr is connected, on one hand, to the coil BC and, on the other hand, to at least one driving electromagnet BE of any suitable type able to impart a short driving impulse to the balance wheel to be sustained.
- the emissions of the input current which release the power impulses occur as the magnetic poles N and 3; move at high speed in the direction 1 passing a bundle of active conductors which belong to the coilBC.
- the source of electric power G and the transistor reiay ATr may simultaneously actuate not only the coil BE but also the coil BR of a receiving chronometric counter.
- the power device according to the invention may also be used for sustaining the continuous rotary motion in one direction only of a magnet A mounted on a spindle 0.
- FIG. 4 diagrammatically illustrates a device of this type in which the rotary magnet A is constituted by a disc ot a material with a strong magnetic field.
- This disc A has at least two peripheral poles N and E3 and on the sides thereof are arranged two stationary tlat coils BC and BE connected with the amplifier ATr and the source of electric power as indicated in MG. 4. It will be seen that the wiring diagram is the same as that of FIG. 1.
- each coil has a curved shape and a width such that the active conductors which cut the lines of magnetic flux (conductors parallel with the spindle O of the disc) are very near the peripheral poles of the magnet.
- the coil BC When the permanent magnet A turns, the coil BC has a variable magnetic flux and an alternating electromotive induction force is developed in this coil which generates at certain intervals the input signal received at terminals 1 and 2 from the amplifier to the transistor ATr.
- Such an amplifier can be set so as to be sensitive only to an input current i having a predetermined direction.
- the maximum active current exists while the line of the NS poles is at a predetermined position in relation to the coil BC (for example in the vicinity of the NS orientation indicated by the arrows on the magnet A of FIG. 4).
- the amplifier ATr delivers to terminals 3 and 4 ari output current I which crosses coil BE.
- the output current I can develop a relatively high electric force.
- coil E By suitably connecting coil E it is possible to have current I exert a considerable torque or couple on the magnet-A. Under these circumstances the magnet A turns with a continuous movement as it receives motive impulses at each passage in the vicinity of the position of FIG. 4. The dead-centers or dead-points are cleared by virtue of the inertia of the rotor.
- the device illustrated in FIG. 4 constitutes a motor without commutator which is able to rotate under a very weak electromagnetic torque since all the passive resistances are extremely weak. It is possible to eliminate the influence of the external magnetic fields by providing a shielding BL aboutthe magnet A and the coils BE and BC, in the shape of a tube coaxial with the spindle O and made of a mild ferro magnetic alloy with a high permeability.
- the transistor motor of FIG. 4 may advantageously be substituted for other types of rotary motors previously used or proposed in the design of clocks and watches with electric wind-up.
- the motor of FIG. 4 may also be used (FIG. 7) for directly driving the hands 23 of a clock by means of a reducing geartrain 24.
- a reducing geartrain 24 In this case, it is necessary that the rotational speed of the magnet A be made uniform.
- various speed regulators of known construction centrifugal force regulators, conical penduiums, magnetic escapements which is already known.
- FIG. 5 illustrates a particular embodiment of the which is diagrammatically represented in FIG. balance wheel is constituted by a disc A magnetized in direction parallel with a diameter NS; it moves inside 11. wide hollow coils BC and BE arranged on eachside and at a short distance from the spindle 0.
- These coils are connected to a transistor element Tr as in the wiring of FIG. 2.
- the clamping ring of the spiral spring 13 is oriented on the spindle O in such a manner that the line NS is parallel with the plane of the coils BE and BC.
- the balance wheel thus obtained is sustained in the same manner as that of FIG. 3 but the electromagnet BE, in this figure, is constituted by a mere coil which exerts an intermittent electromagnetic torque upon the magnet
- the balance wheel in alternating motion chronometric counter of a known type: for instwu moves a fork 14 provided with a driving escapement 6 adapted to rotate an escapement wheel 7, step by a.
- the latter drives, through a train of gears, the spindle which carries a seconds hand 9.
- the other two ha. 10 and 12 are driven by gears and a minutes train 11.
- the power devices illustrated in the drawings may further comprise synchronizing coils the operation of For instance, the pendulum of FIG. 1 having an own period near T it is possible to impose a compulsory period T which is strictly equai to that of a remote time-keeper or a rhythmed time-signal. Such a result is obtained, in particular, by means of an additional coil BS receiving a pulsating synchronizing current with a period T.
- Either the period or the angular velocity of magnet A may be corrected by means of a weak synchronizingsignal acting in the entrance 1-2 to the amplifier ATr.
- the power devices and the winding devices designed in accordance with the invention are applicable to the masterclock, the clocks, and board watches for tripping and warn ing, sounding clocks, recorders, frequency standard indicators, etc.
- the device of FIG. 4 may be used for rotating various apparatus other than clocks, such gramophone records, records of speaking clocks, men.- bers of stroboscopic apparatus, gramophones, gyroscope rotors, etc.
- an electromagnetic impulse power device of type including at least one movable permanent magnet, the construction comprising an isochronal pendulum, a bipolar bar-like magnet transversely carried by said isochronal pendulum, an electronic amplifier of the transistor type having input and output terminals, a source of electric power feeding said electronic amplifier, a first stationary coil surrounding said bipolar magnet, and connected to the input terminals of said electronic amplifier and positioned with respect to said bipolar magnet to set up induwd control currents under the action of the movement oi? said permanent magnet relative to said first coil, and a second coil surrounding said permanent bipolar magnet and adapted to impart successive driving impulses to said permanent bipolar magnet, said second coil being con nected to the output terminals of said electronic amplifier.
- An oscillating commutatorless DC. motor comprising, an electromagnetic field structure, a rotor comprising a permanently magnetized bar'mounted for rotation-with respect to said field structure, at ieast one driving winding said field structure, at least'one control winding ings to bias said transistor to conduction when said rotor rotates, means connected to said transistor and said driving winding to produce a flow of current in said driving windings when said transistor is conductive and means to urge said rotor to a normal position with respect to said field structure and to resist movement from said normal position, said means serving to limit the movement of said rotor under urge of said driving winding to thereby cause said rotor to oscillate about said normal position under control of said windings and said transisters.
- a direct current electric motor comprising, in combination, a stationary electromagnetic field structure, a permanently magnetized bar mounted for rotation within the said field structure, at least one driving winding, on said field structure, at least one control winding on said field structure, and a circuit including a source of direct current, at least one transistor connected with its emittercollector terminals in series with said driving winding, and its base terminal connected to said control winding, said transistor being rendered conductive by the current in cuted in said control winding in response to rotation of said bar to supply current from said source to said driving winding to thus produce magnetic pulses in said field structure for rotating said rotor bar.
- a direct current motor as claimed in claim 3 char acterized in that cessation of rotation causes said transistor to become non-conducting thereby reducing the current in said driving winding to zero.
- a direct current electric motor comprising, in combination, a stationary electromagnetic field structure, a permanently magnetized bar mounted for rotation within the said field structure, at least one driving winding on said field structure, at least one control winding on said field structure, and a circuit including a source of direct current and at least one transistor connected to said driving and control windings, said transistor being rendered selectively conductive in response to rotation of said bar to supply current from said source to said driving winding periodically to thus produce magnetic pulses in said field structure to cause rotation of said rotor bar.
- an electromagnetic impulse driving device of the type including at least one substantially isochronal osciland a second coil connected to the output terminals of said electronic amplifier to receive the output of said amplifier and effective to impart periodic driving impulses to said permanent magnet and said oscillatory member.
- An oscillating commutatorless DC. motor comprising, an electromagnetic field structure, a rotor comprising a permanently magnetized element mounted for a ro tation with respect to said field structure, at least one driving winding on said field structure, at least one control winding on said field structure, at leastone transistor, means connecting each said transistor to one of said control windings to bias said transistor to conduction when said rotor rotates, means connected to said transistor and said driving winding to produce a flow of current in said driving windings when said transistor is conductive and spring means to urge said rotor to a normal position with respect to said field structure and to resist movement from said normal position, said means serving to limit the movement of said rotor under urge of said driving winding to thereby cause said rotor to oscillate about said normal position under control or said windings and said transistors.
- a timing movement comprising at least one s'nh stantially isochronal movable member having at least a permanent magnet portion thereon, an electronic circuit including a transistor having input and output terminals, means for connecting a source of electric power for energizing said electronic circuit, afirst coil connected; to said input terminals of said transistor and positioned with respect to said permanent magnet portion to have control signals induced therein for controlling and causing a periodic ouput from saidtransistor in response to the movement of said permanent magnet portion relative to said coil, and a second coil connected to said output terminals of said transistor to receive saidperiodic ou put thereof and effective in response thereto to impart periodic driving impulses to said movable member.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR654809A FR1090564A (fr) | 1953-09-17 | 1953-09-17 | Perfectionnements apportés aux mécanismes horaires et aux appareils analogues |
Publications (1)
Publication Number | Publication Date |
---|---|
US3168690A true US3168690A (en) | 1965-02-02 |
Family
ID=8698348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US453392A Expired - Lifetime US3168690A (en) | 1953-09-17 | 1954-08-31 | Clock power-device |
Country Status (4)
Country | Link |
---|---|
US (1) | US3168690A (it) |
CH (1) | CH321957A (it) |
FR (1) | FR1090564A (it) |
NL (3) | NL96520C (it) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3292064A (en) * | 1964-03-16 | 1966-12-13 | Gen Electric | Frequency regulated chronometer |
US3343015A (en) * | 1964-05-15 | 1967-09-19 | Suisse Horlogerie | Drive means for a timepiece |
US3365635A (en) * | 1963-10-17 | 1968-01-23 | Smith & Sons Ltd S | Oscillating motor for horological instruments |
US3375423A (en) * | 1964-06-05 | 1968-03-26 | Diehl | Synchronous motor, especially for electric clocks |
US3762154A (en) * | 1971-12-23 | 1973-10-02 | Gen Electric | Simulate pendulum clock |
US3762155A (en) * | 1971-12-23 | 1973-10-02 | Gen Electric | Simulated pendulum clock |
US10037010B2 (en) | 2016-07-01 | 2018-07-31 | Montres Breguet S.A. | Timepiece comprising a device for switching a timekeeping mechanism |
US10078310B2 (en) | 2016-07-01 | 2018-09-18 | Montres Breguet S.A. | Timepiece comprising a device for switching a mechanism of said timepiece |
Families Citing this family (117)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1069084B (it) * | ||||
DE1075207B (de) * | 1960-02-11 | Oskar Vierimg, Elektrotechnische Fabrik, Ebermannstadt | Kollektorlos^ Gleichstrommotor | |
IT547049A (it) * | 1953-06-19 | |||
DE1105804B (de) * | 1953-09-17 | 1961-04-27 | Hatot Leon Ets | Unruh-Gangordner fuer kontaktlos mittels Transistorrueckkopplungsschaltung gesteuerte elektrische Uhren |
US2961587A (en) * | 1954-01-16 | 1960-11-22 | Omega Brandt & Freres Sa Louis | Timepiece |
US2895095A (en) * | 1954-11-01 | 1959-07-14 | Gen Motors Corp | Electronic d.c. motor |
US2852725A (en) * | 1954-11-05 | 1958-09-16 | Clifford Cecil Frank | Electrically-maintained vibratory oscillator |
US2843742A (en) * | 1954-11-06 | 1958-07-15 | Philips Corp | Device for maintaining mechanical oscillations |
US2909732A (en) * | 1954-11-06 | 1959-10-20 | Philips Corp | Device for maintaining mechanical oscillations |
DE1032788B (de) * | 1954-11-25 | 1958-06-26 | Philips Nv | Transistorverstaerker mit Arbeitspunktstabilisierung |
DE1156027B (de) * | 1955-01-21 | 1963-10-17 | Henri Louis Etienne Pommeret | Elektrisch gesteuerter Gangordnerschwinger fuer zeithaltende Geraete, insbesondere elektrische Uhren |
CA578729A (en) * | 1955-03-11 | 1959-06-30 | Hetzel Max | Electric timepiece |
DE1140148B (de) * | 1955-03-16 | 1962-11-22 | Junghans Geb Ag | Zahngesperr fuer Uhrwerke |
US2950447A (en) * | 1955-03-31 | 1960-08-23 | Clarence H Mcshan | Electromechanical transducer apparatus and systems embodying the same |
US2942205A (en) * | 1955-03-31 | 1960-06-21 | Clarence H Mcshan | Electromechanical transducer apparatus and systems embodying the same |
DE1105045B (de) * | 1955-04-21 | 1961-04-20 | Siemens Ag | Einrichtung zur Steuerung der Drehzahl eines zwei- oder mehrphasigen Drehfeldmotors |
DE1230365B (de) * | 1955-04-26 | 1966-12-08 | Omega Brandt & Freres Sa Louis | Elektrische Uhr |
US2962643A (en) * | 1955-04-26 | 1960-11-29 | Omega Brandt & Freres Sa Louis | Time-piece |
DE1109254B (de) * | 1955-05-06 | 1961-06-22 | Westinghouse Electric Corp | Anordnung zur Steuerung oder Regelung der Drehzahl eines Gleichstrom-nebenschlussmotors |
CA583728A (en) * | 1955-05-12 | 1959-09-22 | Bulova Watch Company | Electrical timepiece |
DE1214772B (de) * | 1955-05-13 | 1966-04-21 | Siemens Ag | Einrichtung zur Kommutierung der Ankerstroeme in Gleichstrommaschinen |
DE1060327B (de) * | 1955-05-25 | 1959-06-25 | Gen Electric | Uhrenantrieb mit einem elektronischen Schwingungserzeuger |
US3215917A (en) * | 1955-06-02 | 1965-11-02 | Buck Instr Co | Electrically driven timing device |
DE966290C (de) * | 1955-06-19 | 1957-07-18 | Durowe Deutsche Uhren Rohwerke | Kontaktlos gesteuertes Schwingungssystem |
DE1054026B (de) * | 1955-07-27 | 1959-03-26 | Etablissements Leon Hatot Soc | Elektrische Unruh-Uhr |
DE1113668B (de) * | 1955-07-27 | 1961-09-07 | Hatot Leon Ets | Schaltungsanordnung zur elektrischen Unterhaltung der Schwingungen eines Schwingers |
DE1099949B (de) * | 1955-07-30 | 1961-02-16 | Dr Phil Habil Oskar Vierling | Als Gangordner eines zeithaltenden Geraets dienender mechanischer Schwinger mit kontaktfreier Steuerung |
CH332902A (fr) * | 1955-09-24 | 1958-09-30 | Omega Brandt & Freres Sa Louis | Pièce d'horlogerie électrique |
DE1145364B (de) * | 1955-10-20 | 1963-03-14 | Gasaccumulator Svenska Ab | Antriebsvorrichtung fuer Kreiselrotoren |
DE1108312B (de) * | 1955-12-06 | 1961-06-08 | Oskar Vierling Elektrotechnisc | Kontaktloser Gleichstromantrieb |
US2988868A (en) * | 1955-12-15 | 1961-06-20 | Leon Hatot Ets | Electronic time-measuring arrangement |
DE1099628B (de) * | 1955-12-15 | 1961-02-16 | An Des Etablissements Leon Hat | Schaltungsanordnung fuer einen aus einer Gleichstromquelle gespeisten kollektorlosenElektromotor |
US2974265A (en) * | 1955-12-24 | 1961-03-07 | Kieninger & Obergfell | Electric clock |
DE1266235B (de) * | 1955-12-24 | 1968-04-11 | Kieninger & Obergfell | Elektronisch gesteuerte Uhr |
US3014168A (en) * | 1955-12-28 | 1961-12-19 | Kieninger & Obergfell | Electronically controlled clock |
US3015054A (en) * | 1956-01-14 | 1961-12-26 | Kieninger & Obergfell | Electronically controlled motor |
DE1166349B (de) * | 1956-01-14 | 1964-03-26 | Kieninger & Obergfell | Elektrische Maschine |
DE1055454B (de) * | 1956-01-23 | 1959-04-16 | Oskar Vierling Elektrotechnisc | Kontaktlos ueber Transistoren angetriebenes Schwingsystem |
DE1045917B (de) * | 1956-04-03 | 1958-12-04 | Kieninger & Obergfell | Von einer Gleichstromquelle gespeiste elektrische Selbstaufzugsuhr |
DE1117054B (de) * | 1956-04-14 | 1961-11-09 | Kieninger & Obergfell | Zeithaltende elektrische Vorrichtung, insbesondere elektrische Uhr |
DE1092390B (de) * | 1956-04-27 | 1960-11-03 | Hatot Leon Ets | Uhr mit elektromotorischem Federaufzug |
DE1108313B (de) * | 1956-06-21 | 1961-06-08 | Kieninger & Obergfell | Elektrischer Gleichstrommotor oder Schwinger, insbesondere fuer Uhren |
DE1280757B (de) * | 1956-07-02 | 1968-10-17 | Kieninger & Obergfell | Elektronisch gesteuerte Uhr |
DE1061699B (de) * | 1956-07-03 | 1959-07-16 | Kieninger & Obergfell | Elektrische Uhr |
DE1157158B (de) * | 1956-07-26 | 1963-11-07 | Hatot Leon Ets | Gangordner mit Permanentmagneten fuer Zeitmessgeraete, welcher mit einer elektronischen Schaltung zusammenwirkt |
DE1226045B (de) * | 1956-08-04 | 1966-09-29 | Kieninger & Obergfell | Durch eine elektronische Schaltung kontaktlos selbstgesteuertes mechanisches Schwingungssystem fuer zeithaltende Geraete |
US2940027A (en) * | 1956-08-07 | 1960-06-07 | Texas Instruments Inc | Transistor oscillator circuit |
DE1119398B (de) * | 1956-08-11 | 1961-12-14 | Max Braun Fa | Schaltung fuer Gleich- und Wechselstrombetrieb von Schwingankermotoren |
DE1157157B (de) * | 1957-01-04 | 1963-11-07 | Kieninger & Obergfell | Von einem Primaerelement gespeistes elektrisches Kleingeraet, insbesondere elektrische Unruhuhr |
US3005305A (en) * | 1957-01-04 | 1961-10-24 | Kieninger & Obergfell | Electric watch |
DE1179873B (de) * | 1957-01-25 | 1964-10-15 | Hatot Leon Ets | Zeithaltendes elektrisches Geraet |
DE1165501C2 (de) * | 1957-01-25 | 1974-03-28 | Zeithaltendes, elektrisches geraet, insbesondere elektrische uhr, mit einem gangordnerschwinger | |
DE1291690B (de) * | 1957-02-12 | 1969-03-27 | Kieninger & Obergfell Kg | Elektronischer Oszillator als Antrieb und/oder Gangregler fuer Uhren und andere frequenzhaltende Geraete |
US2877399A (en) * | 1957-02-12 | 1959-03-10 | John M Shaull | Timing device |
DE1052318B (de) * | 1957-02-15 | 1959-03-05 | Kieninger & Obergfell | Uhr, insbesondere elektrische Drehpendeluhr |
DE1076579B (de) * | 1957-03-09 | 1960-02-25 | Ebauches Sa | Uhr mit elektrodynamisch betriebenem schwingendem Hemmwerk |
DE1261802B (de) * | 1957-04-09 | 1968-02-22 | Ebauches Sa | Elektrische Unruh-Uhr |
US3040225A (en) * | 1957-04-10 | 1962-06-19 | Jahresuhren Fabrik G M B H | Impelling and pulse control system for electronic pendulum clocks |
DE1136778B (de) * | 1957-04-11 | 1962-09-20 | Kieninger & Obergfell | Von sich aendernder Gleichspannungsquelle gespeiste elektromagnetische Antriebs- und/oder Gangregler-Anordnung, vorzugsweise fuer Uhren |
DE1052319B (de) * | 1957-04-11 | 1959-03-05 | Kieninger & Obergfell | Antriebsvorrichtung fuer mechanische Schwinger |
DE1096475B (de) * | 1957-04-12 | 1961-01-05 | Bosch Gmbh Robert | Elektromagnetische Antriebsvorrichtung fuer Kraftstoffoerderpumpen von Brennkraftmaschinen |
DE1040970B (de) * | 1957-04-16 | 1958-10-09 | Uhren Rohwerke L Hummel & Co D | Kontaktlos gesteuertes Schwingungssystem |
DE1178015B (de) * | 1957-06-07 | 1964-09-10 | Reich Robert W | Schaltungsanordnung fuer elektronisch betriebene Uhren |
DE1149668B (de) * | 1957-06-08 | 1963-05-30 | Movado Montres | Elektromagnetische Einrichtung zum Antrieb einer Uhr |
US2957116A (en) * | 1957-06-14 | 1960-10-18 | Hurd Lock & Mfg Company | Mechano-electric clocks |
DE1232077B (de) * | 1957-07-01 | 1967-01-05 | Kieninger & Obergfell | Gangreglungseinrichtung fuer den Antrieb von elektrischen Uhren, Zeitnormalen u. dgl. |
DE1280159B (de) * | 1957-07-01 | 1968-10-10 | Kieninger & Obergfell | Elektronisch gesteuerte Uhr |
DE1154404B (de) * | 1957-07-11 | 1963-09-12 | Siemens Ag | Elektronischer Uhrenantrieb |
DE1207886B (de) * | 1957-07-11 | 1965-12-23 | Siemens Ag | Elektronischer Uhrenantrieb |
IT592599A (it) * | 1957-07-11 | |||
DE1207885B (de) * | 1957-07-11 | 1965-12-23 | Siemens Ag | Elektronischer Uhrenantrieb |
DE1078507B (de) * | 1957-09-26 | 1960-03-24 | Siemens Ag | Isochrones Pendel |
DE1119399B (de) * | 1957-10-08 | 1961-12-14 | Reich Robert W | Transistorgesteuerter Schwingankermotor zum Antrieb von Rasiergeraeten |
DE1208699B (de) * | 1957-10-25 | 1966-01-05 | Junghans Geb Ag | Verfahren zur Kompensierung der Temperaturabhaengigkeit des Ganges einer mit Transistorschaltung kontaktlos betriebenen Uhr und zur Durchfuehrung des Verfahrens geeignete Uhr |
DE1178796B (de) * | 1957-12-16 | 1964-09-24 | Junghans Geb Ag | Zeithaltendes elektrisches Geraet, insbesondere elektrische Uhr |
DE1175160B (de) * | 1958-01-08 | 1964-07-30 | Smith & Sons Ltd S | Zeitmesseinrichtung |
DE1087528B (de) * | 1958-01-10 | 1960-08-18 | Reich Robert W | Zeithaltendes elektrisches Geraet, insbesondere elektrische Uhr |
DE1171345B (de) * | 1958-04-16 | 1964-05-27 | Kieninger & Obergfell | Batteriegespeiste Synchronuhr |
DE1149447B (de) * | 1958-05-02 | 1963-05-30 | Horstmann Magnetics Ltd | Elektromotor mit einem mechanischen Schwingungssystem zur Drehzahlregelung |
US3002138A (en) * | 1958-06-24 | 1961-09-26 | Gen Time Corp | Electrically powered oscillatory balance |
US3002139A (en) * | 1958-07-02 | 1961-09-26 | Gen Time Corp | Electrically powered balance mechanism |
DE1218363B (de) * | 1958-07-14 | 1966-06-02 | Kieninger & Obergfell | Mechanisches Schwingsystem, insbesondere Pendel oder Unruh zum Antrieb von Uhren und anderen zeithaltenden Geraeten |
DE1152062B (de) * | 1958-08-08 | 1963-07-25 | Siemens Ag | Elektrischer Uhrenantrieb |
DE1205465B (de) * | 1958-10-18 | 1965-11-18 | Junghans Geb Ag | Elektrodynamisch angetriebene Anordnung, insbesondere Gangordneranordnung fuer Uhrenoder Motorenanordnung |
DE1178795B (de) * | 1958-10-18 | 1964-09-24 | Junghans Geb Ag | Elektrodynamisch angetriebene Anordnung, insbesondere Gangregler-Anordnung fuer Uhren oder Motoren-Anordnung |
DE1616496B1 (de) * | 1958-12-01 | 1971-09-30 | Hatot Leon Ets | Elektrische Alarmvorrichtung,vorzugsweise fuer elektrisch betriebene Weckeruhren |
DE1158453B (de) * | 1958-12-17 | 1963-11-28 | Junghans Geb Ag | Kontaktlos gesteuerte Gangordner-Anordnung fuer zeithaltende elektrische Geraete, insbesondere elektrische Uhren |
DE1165502B (de) * | 1958-12-30 | 1964-03-12 | Hatot Leon Ets | Antrieb fuer Uhrwerke mit selbsttaetigem elektromotorischem Aufzug |
DE1207483B (de) * | 1959-02-05 | 1965-12-23 | Kieninger & Obergfell | Elektromotor fuer Kleingeraete, insbesondere fuer Uhren und andere zeithaltende Geraete |
US3136935A (en) * | 1959-03-18 | 1964-06-09 | Jimmie S Hogan | Commutatorless d. c. motor |
US3117265A (en) * | 1959-07-11 | 1964-01-07 | Movado Montres | Electromagnetic system for the maintenance of the movement of a movable member |
DE1263158B (de) * | 1959-09-30 | 1968-03-14 | Movado Montres | Elektromotor mit einem magnetisierten Laeufer und kontaktlos gesteuerter Erregung der Staenderwicklung |
DE1120384B (de) * | 1959-11-13 | 1961-12-21 | Heliowatt Werke Elek Zitaets A | Uhrwerk, insbesondere fuer eine Schaltuhr, mit einer magnetischen Hemmung |
DE1204147B (de) * | 1959-12-15 | 1965-10-28 | Junghans Geb Ag | Kontaktlos arbeitende Antriebseinrichtung fuer den Gangordner einer elektrischen Uhr |
US3163787A (en) * | 1959-12-15 | 1964-12-29 | Glaser Gunther | Driving mechanism for the movement regulator of an electric clock |
DE1221990B (de) * | 1959-12-28 | 1966-07-28 | Zenith Montres | Elektronisches zeithaltendes Geraet mit ueber einer Transistorschaltung im Normalbetrieb kontaktlos gesteuerten Unruh |
DE1266236B (de) * | 1960-03-15 | 1968-04-11 | Siemens Ag | Anordnung zum Antrieb von mechanischen Schwingungssystemen |
DE1222439B (de) * | 1960-04-20 | 1966-08-04 | Longines Montres Comp D | Elektrische Uhr |
DE1219410B (de) * | 1960-07-28 | 1966-06-16 | United States Time Corp | Arretiervorrichtung zum magnetischen Arretieren eines Zaehne aufweisenden, magnetisierbaren Schaltrades |
DE1204311B (de) * | 1960-08-09 | 1965-11-04 | Licentia Gmbh | Aus einer Gleichstromquelle gespeister Elektromotor ohne mechanischen Kommutator |
US3184623A (en) * | 1960-09-19 | 1965-05-18 | Marti Frederic | Miniature electric motor |
DE1219581B (de) * | 1960-12-06 | 1966-06-23 | Aeg | Gleichstrommotor mit einem mit ausgepraegten Polen versehenen weichmagnetischen Laeufer oder mit einem dauermagnetischen Laeufer |
DE1231176B (de) * | 1961-06-01 | 1966-12-22 | Horstmann Gear Co Ltd | Gangregeleinrichtung fuer Uhrwerke od. dgl. |
DE1226496B (de) * | 1961-09-09 | 1966-10-06 | Junghans Ges Mit Beschraenkter | Elektromagnetisch angetriebene Schwinger- oder Motorenanordnung |
DE1238856B (de) * | 1962-03-28 | 1967-04-13 | United States Time Corp | Zeithaltendes Geraet, insbesondere elektrische Uhr |
DE1229463B (de) * | 1962-04-17 | 1966-11-24 | Kienzle Uhrenfabriken Ges Mit | Elektronische Uhr |
DE1211706B (de) * | 1962-08-09 | 1966-03-03 | Max Planck Gesellschaft | Elektrischer Impulsgeber |
DE1277762B (de) * | 1962-08-22 | 1968-09-12 | Ebauches Sa | Antriebsunruh fuer elektrische Uhren |
US3167906A (en) * | 1962-08-31 | 1965-02-02 | Kokusai Electric Co Ltd | Timekeeper corrected by electric time signals |
DE1221154B (de) * | 1962-09-05 | 1966-07-14 | Kienzle Uhrenfabriken Ges Mit | Uhr mit Laeutwerk |
DE1231174B (de) * | 1962-09-10 | 1966-12-22 | Licentia Gmbh | Uhr mit Gleichstromantrieb und Transistorsteuerung |
DE1244284B (de) * | 1962-10-19 | 1967-07-13 | Licentia Gmbh | Drehzahlregelschaltung fuer ueber Transistoren gespeiste Gleichstrommotoren |
DE1244665B (de) * | 1962-11-03 | 1967-07-13 | United States Time Corp | Zeigerwerksantrieb |
DE1246595B (de) * | 1963-01-07 | 1967-08-03 | Reich Robert W | Magnetanordnung fuer elektrische und elektronische Uhren |
DE1523934A1 (de) * | 1965-06-08 | 1970-03-26 | Junghans Gmbh Geb | Auf elektromagnetischem Wege in Schwingung gehaltene Stimmgabel |
FR1505391A (fr) * | 1966-06-28 | 1967-12-15 | Hatot Leon Ets | Perfectionnements aux vibreurs à flexion et aux oscillateurs électromécaniques comportant de tels vibreurs |
JPS6093982U (ja) * | 1983-12-01 | 1985-06-26 | 富士計器株式会社 | 総体振り時計 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR375188A (fr) * | 1907-03-01 | 1907-07-02 | Charles Fery | Pendule électrique libre sans échappement ni rouages |
US1560056A (en) * | 1923-05-01 | 1925-11-03 | Western Electric Co | Source of waves of constant frequency |
GB601712A (en) * | 1945-02-26 | 1948-05-11 | Hillyard Thomas Stott | Improvements relating to apparatus for time measurement |
US2472249A (en) * | 1945-09-08 | 1949-06-07 | Liquidometer Corp | Liquid level measuring device with oscillator |
US2640978A (en) * | 1949-10-22 | 1953-06-02 | Claesson Per Harry Elias | Capacity actuated burglar alarm |
US2652460A (en) * | 1950-09-12 | 1953-09-15 | Bell Telephone Labor Inc | Transistor amplifier circuits |
US2680160A (en) * | 1951-09-15 | 1954-06-01 | Bell Telephone Labor Inc | Bias circuit for transistor amplifiers |
US2719944A (en) * | 1954-06-10 | 1955-10-04 | Harrison D Brailsford | Commutatorless direct current motor |
US2769946A (en) * | 1955-02-16 | 1956-11-06 | Harrison D Brailsford | Oscillating commutatorless direct current motor |
-
1953
- 1953-09-17 FR FR654809A patent/FR1090564A/fr not_active Expired
-
1954
- 1954-08-20 CH CH321957D patent/CH321957A/fr unknown
- 1954-08-31 US US453392A patent/US3168690A/en not_active Expired - Lifetime
- 1954-09-17 NL NL190893A patent/NL96520C/xx active
-
1960
- 1960-09-05 NL NL255580A patent/NL113502C/xx active
- 1960-09-05 NL NL255581D patent/NL255581A/xx unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR375188A (fr) * | 1907-03-01 | 1907-07-02 | Charles Fery | Pendule électrique libre sans échappement ni rouages |
US1560056A (en) * | 1923-05-01 | 1925-11-03 | Western Electric Co | Source of waves of constant frequency |
GB601712A (en) * | 1945-02-26 | 1948-05-11 | Hillyard Thomas Stott | Improvements relating to apparatus for time measurement |
US2472249A (en) * | 1945-09-08 | 1949-06-07 | Liquidometer Corp | Liquid level measuring device with oscillator |
US2640978A (en) * | 1949-10-22 | 1953-06-02 | Claesson Per Harry Elias | Capacity actuated burglar alarm |
US2652460A (en) * | 1950-09-12 | 1953-09-15 | Bell Telephone Labor Inc | Transistor amplifier circuits |
US2680160A (en) * | 1951-09-15 | 1954-06-01 | Bell Telephone Labor Inc | Bias circuit for transistor amplifiers |
US2719944A (en) * | 1954-06-10 | 1955-10-04 | Harrison D Brailsford | Commutatorless direct current motor |
US2769946A (en) * | 1955-02-16 | 1956-11-06 | Harrison D Brailsford | Oscillating commutatorless direct current motor |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3365635A (en) * | 1963-10-17 | 1968-01-23 | Smith & Sons Ltd S | Oscillating motor for horological instruments |
US3292064A (en) * | 1964-03-16 | 1966-12-13 | Gen Electric | Frequency regulated chronometer |
US3343015A (en) * | 1964-05-15 | 1967-09-19 | Suisse Horlogerie | Drive means for a timepiece |
US3375423A (en) * | 1964-06-05 | 1968-03-26 | Diehl | Synchronous motor, especially for electric clocks |
US3762154A (en) * | 1971-12-23 | 1973-10-02 | Gen Electric | Simulate pendulum clock |
US3762155A (en) * | 1971-12-23 | 1973-10-02 | Gen Electric | Simulated pendulum clock |
US10037010B2 (en) | 2016-07-01 | 2018-07-31 | Montres Breguet S.A. | Timepiece comprising a device for switching a timekeeping mechanism |
US10078310B2 (en) | 2016-07-01 | 2018-09-18 | Montres Breguet S.A. | Timepiece comprising a device for switching a mechanism of said timepiece |
Also Published As
Publication number | Publication date |
---|---|
NL255581A (it) | 1966-08-15 |
FR1090564A (fr) | 1955-03-31 |
CH321957A (fr) | 1957-05-31 |
NL96520C (nl) | 1961-01-16 |
NL113502C (nl) | 1967-01-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3168690A (en) | Clock power-device | |
US2769946A (en) | Oscillating commutatorless direct current motor | |
US2994023A (en) | Motor | |
US3375423A (en) | Synchronous motor, especially for electric clocks | |
US2606222A (en) | Electric motor | |
US3214662A (en) | Electro-mechanical oscillation sustaining drive system | |
US3207965A (en) | Adjustable mechanical oscillator for time-measuring apparatus | |
GB746465A (en) | Improved electromagnetic impulse device for driving clocks | |
US3407344A (en) | Electronic timekeeper | |
US3040225A (en) | Impelling and pulse control system for electronic pendulum clocks | |
US3123755A (en) | Electrical system for maintenance of | |
US3002138A (en) | Electrically powered oscillatory balance | |
US3327190A (en) | Electronic timepiece | |
US3509437A (en) | Timepiece drive | |
US2988868A (en) | Electronic time-measuring arrangement | |
US2916641A (en) | Electrically maintained balance wheel | |
US3596461A (en) | Electromagnetic driving system for timepieces | |
US3646750A (en) | Electronic clockwork drive | |
US2986686A (en) | Electro-mechanical devices | |
US3124730A (en) | Thoma | |
US3787783A (en) | Time-keeping device with transistor control using oscillating magnet | |
US2999966A (en) | Timepiece comprising an electromagnetically maintained oscillating regulator | |
US1255905A (en) | Electric clock. | |
US3641761A (en) | Watch transducer | |
US3134062A (en) | Light magnetic circuit oscillating motor |