USRE6581E - Improvement in electric annunciators - Google Patents

Description

G. W. SHAWK.

El ectric-Annunciators.

Rissued Aug. 3, I875.

Wl'iness cs.

UNITED STATES.

PATENT- OFFICE.

GEORGE w; SHAWK', oE CLEVELAND OHIO, AssreNoa, BY, MEsNE AssIen:

MENrs'oE Paar INTEREST =ro CHARLES UHL, JOHN cameras, n. A

oROsSLEY, AND W. H.-OROWELL.

M -oyEjM armErec'rmc ANNUNCIATORS.

Specification forming part of Letters Patent No. 139,825, dated J one 10, 18 73; reissue No. 6,581., dated August 3, 1875 application filed March 20. 1574.

To all whom it may concern:

Be it known that I, GEORGE W. .SHAWK, of

- Cleveland, county of Ouyahoga, State of Ohio,

have invented a new and Improved Electro- Magnetic Ann unciator, of which the following is a specification:

This improvement relates to an electromagnetic annunciator in which the numbered or lettered plate is maintained in a fixed position by means of the residual magnetism of the electro-magnets employed; and to this end the invention consists, first, in the construction and arrangement of the armature and elect-ro-magnets of an annunciator,in such a manner that the armature, upon its being attracted toward theeIectromagnetS as the cir cuit is closed, will be brought in direct contact with the ends of the cores,'and' then be retained in a fixed position after the circuit is broken by the residual magnetism of the electro-magnets in connection with an independent mechanical power, whereby the armature may be released from the cores by a positive mechanical action second, in the combination of a numbered or lettered plate with thearmature of' an electro-magnet, the armature being arranged relatively to the ends of the coresin such a manner that, the circuit being closed,

the armature will be attracted toward the electro-magnets by magnetic influence, and retained in direct contact with the same by residual magnetism, thereby serving as the actuating and retaining mechanism of the lettered plate; third, .in the combination of a weighted arm with the side of the armature opposite the numbered or lettered plate, to, counterbalance the said plate and insure the ready attraction of the armature to its cores by the employment ofa' comparatively feeble electric current; fourth, in combination with an armature of an e ectro magnet, which is retained in direct contact with the cores of the magnet by residual magnetism, of a crankshaft, having an arm secured thereto, whereby the armature carrying the lettered plate is detached from the cores by asingle revolution of the crank-shaft.

In the drawings, Figure l is a front elevation. of my improvement, the front plate re- I t-ric current.

.The operation is as follows: The armature moved showing the relation of the armature to the magnet. the same. gFig. 3 is a front view of the box.

A represents the box for containing the working parts of the annun'ciator. B is an electro-magnet secured tothe back of the box,

' and placed in a circuit embracing the battery,

and the room fromwhich the signal is to be sent.- 0 is the armature attached to the upright bar D, the lower end of which is suspended or pivoted bysmall journals in ayoke,

E,'setting on the bottom of a box, so that the bar may be tilted back and forth. In front of the bar D is an arm, F, extending forward and carrying a plate, G, upon which. is a bar to counterbalance the arm F. There is an arm, H, attached -to the top of the bar D, to pre vent the armature from falliu g forward too far.

There is asmall post, I, in front of the yoke E, for the arm F to rest upon when tilted to?- ward. K is a shaft extending through the box just below the armature, and operated by a crank, J, on theoutside of the box. A small arm, L, on the shaft K is made to throw the armature off from the magnet by a positive and'tlirect mechanical action when the shaft K is revolved by the crank J, by "striking against a small arm,'M, projecting from the top of the'bar 1).

To impart thedesired movement to the numbered plate, the latter device is connected to the armature by a lever of sutficient length to carry the plate through the desired-space. With the plate secured to the connecting-lever at a sufiicient distance from its fulcrum to secure the desired movement of the plate, a strong current of electricity would be required to attract the armature to the magnets, and thus proportionately enhance the expense of maintaining the batteries. To obviate this expense a weighted lever is secured to the armature opposite to the nnmberedfplate to counterbalance the weight of the latter, and thereby insure the attraction of the armature to its magnets by the employment of a slight elecbeing tilted forward, the bar or plate is down below the opening in the glass front out of Fig. 2 is a vertical section of view,

when the electric current is completed l by any suitable device. Ilhe armature is attracted to the magnet, striking it with a click,- and is retained in contact by residualmagneh ism, and the bar or plate is raised to view, and remains there until thrown back by the'positive action of the crank. I

A bell may be arranged to sound'in connection with the movement of the armature, it desired.

What I claim, and desire to secure byLet ters Patent, is-

1. Juan electric annunciator, the combination' of an electro-mag'net with -an armature,

which is actuated by magnetic attraction, and retainedin direct contact with the cores of the electro-magnet by residual magnetism, in connection with independent mechanism, substan- I tially as described, whereby the armature is forced from the cores by positive mechanical action, substantially as set forth.

.2. In an electric annuncietor, the combination of a numbered or lettered plate with the armature of an electro-magnet, the armature adapted to beretained in direct contact with the cores of the magnet by residual magnetism, substantially as described.

3. In an electric annunciator, the combination of a weighted .ar-m with the armature of an electro-magnet, to which a lettered o'r numbered plate is secured thereby insure the attraction of the armature to the magnet by'a light electric current, substantially as described.

4. In an electric annuuciator, the combination of a crankshaft, having an arm. secured thereto, with the armature of an electromagnet, to which a lettered or numbered plate is secured, for the purpose of releasing the armature frcm the electro magnet, and allow the letters or numbers to move away from view, substantially as described.

GEO. W. SHAWK.

Witnesses:

GEO. W. Tmmcrrs, Emma-Wrrmeomn.

, for the purpose of coun- I terhalancing-the weight of the said plate,'and

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