US1728338A - Electrical clock - Google Patents

Description

Sept 17, 1929- ABRAM-Louls .umNr-:RETJ FILS 1,728,338

ELECTRICAL CLOCK .Filed April 18, 1927 Figs.

/en f UNITED STATES PATENT oFFica ABRAM-LOIJ'IS JEA'NNERET, FILS, OF LA CHAUXA-DE-FONIDS, SWITZERLAND, ASSIGNOR TO COMPTOIR GENERAL DE VENTE DE LAA MONTRE ROSKOPF SOCIETE ANONYME VVE. CES. LEON SCHMID & CIE., OF LA CHAUX-DE-FONDS, SWITZERLAND nLnc'rRrcaL cnocx Application led pril 18, 1927, Serial No. 184,802, and. in Germany December 10, '1926.

p The present invention relates to an electrical clock for which the motive power is furnishedvby a main spring bent periodically by the oscillating armature of an elec- `5 tro-magnet. The power of said spring is Atransmitted to the clockwork and this latter closes a circuit actuating said armature or pallet before the said spring is completely -lnbent During the short time of the bending of the main spring asmall auxiliary spring bearing on the pallet furnishes the impu se for keeping up the movement ot the clockwork.

Such an arrangement has the advantage to set in readiness the power required for breaking the circuit -when the pallet begins `to move vso that, when a gradual decrease v of the voltage at the source of the current is produced by the consumption of current which will-show itself b .a decrease of the sway of the armature, t e 'breaking can be A effected with the required power furnished by the auxiliary spring.

In the accompanying drawing a working \orm is shown of the object oi the invention.

Figs. 1 agi 2 are plan views, Fig. lshowing the position of' parts when the circuit is open and Fig. 2 when it is closed.

.Armature 5 is pivotally supportedbetween the poles 2 of the electro-magnet 3 by an axle 4 which takes the place of the barrel arbor of the clock. A contact nose 18 provided with a carrier pin 20 and forming one member of a make and break contact device is rigidly fast to the amature and likewise a cross arm 6 which is attached .'by a tension spring 7 which is the main spring of the clock, to a stationary stud 8. On the same axle 4 is also mounte loose an insulating arm 19 which is coupled trailingly with the contact held loose on the axis 4 and.- is connected with the contact nose 18 by means of a circularly curved hair spring 25. A contact piece 22 forming the second member of the make and break contact de- Lvice is fast to a flat spring 23 bent off at its free end at 2,6. The insulating arm 19 is provided with two notches 27, 28 separated by a tooth 29 and forming rests for the bent 0d end of spring 23 in the make contact and the break contact positions of the armature.

When in the position shown in Fig. 2 the circuit is closed the armature 5 moves in aclockwise sense. It takes the Contact nose 18 along with it and bends the hair spring 25 because the end 24 of said spring attached to the arm 19 is kept stationary with ksaid arm by spring 23 while the other fixing point of the spring moves with the-contact nose. During this movement the contact nose lifts the contact piece 22 so that the bent-off edge 26 gradually leaves the notch. 28 until the contact between 22 and 18 is broken at the moment when edge 26 has reached the edge of tooth 29 the tension of spring 25 will eect the dragging along of the insulating arm and the dropping of spring 23 into the notch 27. The breaking of the contact will deenergize the electromagnet, so that spring 7 is free to swing the armature 5 back again into the position of Fig. 2.

Dueto this swinging of the armature the clockwork is wound up. As soon as armature 5 has taken this position of Fig. 2 pin Cil 20 will come to bear on the arm 19 and I push it back until spring 2,3 has snapped over the tooth 29 and' piece 22 has been laid iiat upon the nose 18. Then the circuit is closed again and the same play will take place as before.

What I claim is:

In an electric clock a make and break coritact device comprising an electro-magnet,` an oscillating armature or p allet depending thereon and mounted fast on the driving arbor f the clock,l a contact nose and an arm rigidly fast to said armature, and a tens1on or main spring connecting said arm to a stationary stud, a fiat contact spring arranged so as to be engaged by said contact nose and having a bent oii' end, an insulating arm mounted loose on said arbor and provided with notches as rests for the bent oif end of the contact spring in its make contact and its break contact positions, a circularly curved hair spring as coupling member between said insulated arm and said con- {tact nose and a carrier pin fast to the contact nose and adapted to disengage said con? tact spring from the break contact notch.

In testimony whereof I aix my signature.

ABRAM-LOUIS J EANNERET FILS.

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