US716996A - Electric clock. - Google Patents

Description

N0. 7l6,996. Pfented Dec. 30, |902.

M. FISCHER.

ELECTRIC CLOCK.

Application led Sept. 3, 1901;)

(No Model.)

UNITED STATES PATENT OEEICE.

MARTIN FISCHER, OF ZURICH, SWITZERLAND, ASSIG-NOR TO ACTIENGESELL- SCHAFT MAGNETA ELECTRISCHE UHREN OHNE BATTERIE it OHNE CON- TACTE, OF ZURICH, SWITZERLAND, A FIRM.

ELECTRIC CLOCK.

SPECIFICATION forming part f Letters Patent No. 716,996, dated December 30, 1902.

Application iiled September 3, 1901. Serial No. 74,163. (No model.)

'o @ZZ whom, it may concern:

Be it known that I, MARTIN FISCHER, a citizen of the Republic of Switzerland, residing at Zurich, Switzerland, have invented new and useful Improvements in or Relating to Armatures for Electric Clocks, of which the following is a specication. y

This invention has reference to improvements in armatures for reversible-current ro subordinate clocks. According thereto the armature is constructed with a bent portion that is arranged with and quite close to the surface of a permanent magnet without being in contact therewith and is made comparatively large in area, so that a large surface is provided thereby, enabling smaller electromagnets to be used.

An example of apparatus according to this invention is shown in the accompanying 2o drawings, in Which- Figure 1 is an elevation,and Fig. 2 is a plan.

3 is an armature constructed with a bent portion that is arranged parallel to a permanent magnet 4. The armature 3 is attached to a tube 6, which is placed on a pin 7, Secured to the base-plate, so that the armature can oscillate, as well known, in front of the poles of the electromagnet M about the pin 7.'

3o On the bent portion of the armature there is provided in line with its aXis of rotation a short pin 8, which projects upwardly, so as to prevent the armature, which is powerfully attracted by the permanent magnet 4, from coming into contact with the said permanent magnet. The bent portion of the armature is made comparatively large in area, so that a large and efficient surface is provided, thereby enabling very small electromagnets 4o to be used, while at the same time producing a powerful polarity of the armature.

It will be observed that one end of the permanent magnet 4 is bent at right angles, the bent portion 4 extending between the cores of the electromagnets M on the rear face of the conductive plate m, in which said cores are seated and to which said vertical portion 4 of the permanent magnet 4 is secured by means of a screw, so that the other pole of 5o the magnet 4 serves to polarize said cores.

`crank lever 11 12 with the said spring is located at a considerable distance from the 6o stud 10, so that when the armature is moved by the current passing through the electromagnetthe ends of the lever will make a considerable to and fro movement. The ends of the arms 11 and 12 of the bell-crank 65 lever are provided with pins 13 and 14, which when the bell-crank lever is moved about the Astud 10 come alternately into contact with the teeth of a wheel 16, so as to move the said wheel forward each time by one tooth 7o and then hold it.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed,

I declare that what I claim is- 1. In a reversible current subordinate clock, the combination with the escapementwheel and its anchor; of an electromagnet,v a right-angular permanent magnet having one of its poles extended beyond said elec- 8o tromagnet, a pivotallymounted armature for said electromagnet having a right-angular extension parallel with and proximate to the extended pole of the permanent magnet andY presenting such a large surface to the infiuence of the magnetic field as to admit of the use of a very small electromagnet, and a connection between the armature and anchor adapted to oscillate the latter, substantially as set forth. 9o

2. In a reversible current subordinate clock, the combination with the escapementwheel and its anchor; of an electromagnet, a right-angular permanent magnet havingone of its poles 4 arranged to polarize the elec- 95 tromagnet-cores and its opposite pole 4 extended beyond said cores and between them,

a pivotally-niounted armature havinga rightangular extension parallel with and proximate to the extended pole of the permanent roo magnet, and a resilient connection between said axis of rotation; of a permanent magthe armature and anchor adapted to oscilnet arranged with one of its poles parallel to late the latter, for the purpose set forth. the armature extension and a spacing de- 15 3. In reversible-currentsubordinateclocks, Vice between the two, for the purpose set 5 the combination with an escapeinent-wheel forth.

and its anchor, an electromagnet and its ar- In testimony whereof I have signed my mature provided with an extension, an arm name to this specification in the presence of on said armature, a spring on the arm, one two subscribing witnesses.

end of which spring is connected with said MARTIN FISCHER. ro arm at a point close to the axis of rotation of Witnesses:

the anchor and having its opposite end con- A. LIEBERKNECHT,

nected to the anchor at a point distant from E. J. WESTERMANN.

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