US2084226A - Electric clock - Google Patents

Electric clock Download PDF

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Publication number
US2084226A
US2084226A US72420A US7242036A US2084226A US 2084226 A US2084226 A US 2084226A US 72420 A US72420 A US 72420A US 7242036 A US7242036 A US 7242036A US 2084226 A US2084226 A US 2084226A
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United States
Prior art keywords
spindle
spring
wheel
blade
sleeve
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
US72420A
Inventor
Strahm Andre
Original Assignee
Samuel Maeder
Gerard Friedli
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
Priority to CH2084226X priority Critical
Application filed by Samuel Maeder, Gerard Friedli filed Critical Samuel Maeder
Application granted granted Critical
Publication of US2084226A publication Critical patent/US2084226A/en
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Expired - Lifetime legal-status Critical Current

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    • GPHYSICS
    • G04HOROLOGY
    • G04CELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/04Electromechanical 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
    • G04C3/06Electromechanical 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
    • G04C3/061Electromechanical 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 contacts and mechanically driving the gear-train
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/21Elements
    • Y10T74/2133Pawls and ratchets

Description

June 15, 1937.
A. STRAHM ELECTRIC CLOCK Filed April 2, 1936 Patented June 15, 1937 UNITED STATES PATENT OFFICE ELECTRIC CLOCK Application April 2, 1936, Serial No. 72,420
2 Claims.
This invention relates to electric clocks of the type in which the clock movement is driven by electromagnetic means entertaining the motion of an oscillatable regulating member.
It is an object of the invention to provide an electric clock of this type with a driving device and a circuit interrupting device capable of being actuated by a small electric power source over a long period of time. In order to obtain this result, it is necessary that the oscillatable regulating member be very easily movable, that is to say that actuation of the switch and driving of the time train requires only a slight effort of the oscillating member so that a minimum electromagnetic force of very short duration will be sufficient for actuating the clock movement.
The accompanying drawing shows a preferred practical embodiment of the invention.
Figure l is a plan view on the clock movement plate carrying the driving and regulating mechanism.
Figures 2 and 3 show two different positions of the cooperating stationary and movable contact members of the circuit of the electromagnet.
, Figures 4 and 5 show two positions of the driving armature.
Figure 6 is a partial section along the shaft of the regulating member showing the transmission of movement to the clockwork train.
Figures 7 and 8 show the coacting driving member and wheel in two difierent positions of operation.
On the movement plate a is mounted a spindle I in two bearings b and c. This spindle carries a balance wheel 2 coacting with a spiral spring 3, and an armature M of an electromagnet having a coil Ill and a core l5. A source of electric current which may be constituted by a small electric cell is connected by a conductor l3 to the mass, and by a. conductor II to a binding post II insulatedly mounted on the plate a and making contact with one terminal 8 of the coil III, the terminal 9 of the coil being connected with an insulated contact block 1 carrying a resilient 0 contact blade 5 the free end of which is bent to form an angle as shown in Figs. 2 and 3. A second spring blade 6 carried by the contact block I bears on the blade 5 to increase the pressure tending to yieldingly hold the blade 5 in its normal horizontal position. The end of the blade 5 coacts with a contact pin 4 carried by the spindle I which is in electric contact with the mass.
A sleeve 18 is forced upon the spindle l and is 55 provided with a recess 22 at its lower end to form In Switzerland August 6, 1935 a lodgment for a weak spring l1 coiled about the spindle l and having an end l6 projecting out of the sleeve l8 across a longitudinal slit l9 provided in the sleeve. The armature M which is secured to the spindle I closes the recessed end of 5 the sleeve [8 and serves as bearing surface for the spring H. The end l6 of the spring cooperates with a wheel 20 having ratchet teeth and disposed in a plane extending parallel to the axis of the spindle I. This wheel forms the first 10 mobile member of the clock time train. A holding spring pawl 2| prevents backward rotation of the wheel 20.
When the spindle l oscillates in the direction indicated by the arrow J in Figs. 2 and 4, the pin 15 4 of the spindle will abut against the lower face of the bent up inclined portion 5a of the blade 5. The blade end is pushed upwardly by the pin, and since the spring 6 is still bearing on the blade, a good contact pressure will be obtained while the pin 4 passes along the lower face of the blade 5. The following electrical circuit of the coil 12 is now established: Binding post ll, conductor 8, coil l0, conductor 9, contact block 1, blade 5, pin 4, spindle l, bearings b and 0, plate a, conductor l3. The coil 10 is energized and an impulse im- 25 parted to the armature ll which, in the moment of closure of the circuit, is in the position shown in Fig. 2. The armature then oscillates in the direction of the arrow 1 and tensions the spiral spring 3. On the return oscillation of the spindle l and armature M, as shown in Figs. 3 and 5, the pin l4 passes above the blade 5 and just slightly touches the end of the inclined portion 5a. the upper face of which may be coated with an insulating material to prevent electric contact between the pin and the blade on the return oscillation.
During oscillation of the spindle I, the spring l1 turns with the spindle and the sleeve l8, and in one direction of rotation, as indicated in Fig. '7,
the spring end l6 abuts against the radial face of a ratchet tooth of the wheel 20 and imparts a movement of rotation to the wheel until it falls off from the tooth. On the return oscillation, shown in Fig. 8, the spring end l6 slides along the inclined back face of a tooth. As the pawl 2| holds the wheel 20 against return movement, the spring I1 yields, the slit I9 permitting the spring end 16 to move downwardly to pass over a tooth. The spring end l6 thus imparts a step by step movement to the wheel 20.
I claim:--
1. In an electric clock having an oscillatable spindle carrying the armature of an electromagnet and a balance wheel, a helicoidal spring wound about said spindle and mounted for oscillation with the spindle, one end of said spring projecting laterally of the spindle and being capable of yielding in axial direction, and a wheel having ratchet teeth coactingwith said laterally projecting spring end whereby upon oscillation of the spindle and spring in one direction the spring end abuts against a radial face of a ratchet 10 tooth to impart a movement of rotation to said wheel, and upon oscillation of the spindle and spring in opposite direction the spring end slides over the inclined back face of the next following ratchet tooth and yields in axial direction to 15 engage with the radial face of said tooth.
2. In an electric clock, a, motor driven oscillatory spindle, a sleeve surrounding the spindle and mounted for oscillation therewith, a hellcoidal spring wound about the spindle internally of said sleeve, said sleeve being provided with an axially extending slit, the spring having one end thereof extending laterally of the spindle across said slit in the sleeve to cause. oscillation of the spring with the spindle and to permit yielding of the spring end in axial direction, and a wheel provided with ratchet teeth disposed in a plane parallel with the axis of the spindle and in proximity to the spindle to coact with said spring end whereby said oscillating spring end imparts a step by step movement of rotation to said ratchet wheel.
ANDRE STRAHM.
US72420A 1935-08-06 1936-04-02 Electric clock Expired - Lifetime US2084226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH2084226X 1935-08-06

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487026A (en) * 1944-11-24 1949-11-01 Dayton Acme Co One-way wedging clutch
US2533638A (en) * 1946-08-30 1950-12-12 Thornton-Norris George Instrument for indicating the operating time of vehicles and other devices
US2572989A (en) * 1948-10-27 1951-10-30 Gen Motors Corp Electric clock drive
US2577703A (en) * 1947-10-31 1951-12-04 Hamilton Watch Co Electric watch
US2626500A (en) * 1948-07-15 1953-01-27 Casco Products Corp Electric clockwork movement
US2631423A (en) * 1945-07-11 1953-03-17 Gen Motors Corp Electric clock
US2642714A (en) * 1947-12-23 1953-06-23 Gen Motors Corp Electric clock
US2757555A (en) * 1953-08-04 1956-08-07 Elgin Nat Watch Co Pawl and ratchet mechanism
US2757545A (en) * 1953-08-04 1956-08-07 Elgin Nat Watch Co Power take-off device, particularly for timepieces
US2897680A (en) * 1956-12-31 1959-08-04 Hamilton Watch Co Driving mechanism for an index wheel
US2918823A (en) * 1958-02-14 1959-12-29 Lissance Alexander Variable ratchet drive and the like
US2926534A (en) * 1956-12-31 1960-03-01 Hamilton Watch Co Index mechanism
US2990676A (en) * 1958-07-16 1961-07-04 Hamilton Watch Co Battery driven clock
US3011305A (en) * 1958-07-16 1961-12-05 Hamilton Watch Co Indexing mechanism

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487026A (en) * 1944-11-24 1949-11-01 Dayton Acme Co One-way wedging clutch
US2631423A (en) * 1945-07-11 1953-03-17 Gen Motors Corp Electric clock
US2533638A (en) * 1946-08-30 1950-12-12 Thornton-Norris George Instrument for indicating the operating time of vehicles and other devices
US2577703A (en) * 1947-10-31 1951-12-04 Hamilton Watch Co Electric watch
US2642714A (en) * 1947-12-23 1953-06-23 Gen Motors Corp Electric clock
US2626500A (en) * 1948-07-15 1953-01-27 Casco Products Corp Electric clockwork movement
US2572989A (en) * 1948-10-27 1951-10-30 Gen Motors Corp Electric clock drive
US2757545A (en) * 1953-08-04 1956-08-07 Elgin Nat Watch Co Power take-off device, particularly for timepieces
US2757555A (en) * 1953-08-04 1956-08-07 Elgin Nat Watch Co Pawl and ratchet mechanism
US2897680A (en) * 1956-12-31 1959-08-04 Hamilton Watch Co Driving mechanism for an index wheel
US2926534A (en) * 1956-12-31 1960-03-01 Hamilton Watch Co Index mechanism
US2918823A (en) * 1958-02-14 1959-12-29 Lissance Alexander Variable ratchet drive and the like
US2990676A (en) * 1958-07-16 1961-07-04 Hamilton Watch Co Battery driven clock
US3011305A (en) * 1958-07-16 1961-12-05 Hamilton Watch Co Indexing mechanism

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