US841307A - Electric annunciator. - Google Patents

Description

No. 841,307. PATENTED JAN. 15, 1907. G- BLAKE.

ELECTRIC ANNUNGIATOR.

APPLICATION FILED NOV. 29, 1905.

mm. X

UNITED STATES WESTERN ELECTRIC COMPANY.

RATION ILLINOIS.

or CHICAGO, ILLINOIS, A com csasc'mlc ANNuNcmToa.

' Specification of Letters Patent. Application filed November 29,1905. Serial No. 289,565.

Patented Jan. 16, 1907.

To all whom it may concern.-

Be it known that 1, CHARLES C. BLAKE, a citizen of the United States, resi at Brookline, in the county of Norfolk and tate of Massachusetts, have invented a certain new and useful Improvement in Electric Annunciators, of which the following is a full, clear, concise; and-exact description.

My invention relates to electric annunciators 111 which a signal target is held in a receptacle containing an opaque or colored liquid and is adapted to be moved toward and from a transparent window of the rece tacle, the face of the target being visible only when in proximity to the window.

The object of my invention isto provide a durable construction in which the o eration of the signal is ra id and certain and in which there is no ossiiiilit of the liquid escaping into the 001' s of the e ectromagnet.

In a well-known form of annunciator, of

which my present invention constitutes an improvement, the opaqpe liquid and the target are held in a cham er forming an exten sion of the shell inclosing the annunciatormagnet. With this construction there may be a liability of the liquid to .escape into the coil of the electromagnet and injure the same. Furthermore, when the face of the target is in contact with the glass window there is a tendency of the two surfaces to adhere, so that the armature does not readily and rapidly respond to the attraction of its magnet. By my invention these objections are entirely overcome.

In my invention the chamber or receptacle containing the fluid is separate from the inclosing shell of the annunciatormagnet. The magnet is secured on the rear of a mounting-strip and the receptacle containing the fluid is so arately mounted on the front thereof. The face of the target has a grooved surface, which allows a free circulation of the liquid and overcomes the tendency of the target to adhere to the window.

I will describe my invention more particularly by reference to the accompanying draws, in which igure 1 is a front elevation of two of my annunciators secured to a mounting-strip, one of the annunciators being shown as displaying its signal. 2 is a section on the inc 2 2 of Fig. 1, showing the signal in proxtion with parts broken away, showing the armature attracted by the electromagnct. Fig. 4 is a section on the line 4 4 of Fi 2. Fig. 5 is a perspective view of the signa -target.

The same letters of reference are used to designate the same parts wherever they are.

'shown.

The electromagnet a is inclosed in a shell I; and is secured on the rail of a mounti -strip 0 about an openin c therein, prefera ly by.

screwing the core in a threaded perforation in a brass disk e, secured in an opening in said imity to the window. 3 is a similar secmounting-strip. Separately mounted in any suitable manner on the face of the strip 0 is a hermetically-sealed receptacle f, ha a transparent window or face g of glass. nclosed within this receptacle is the armature h of the ma net and a colored liquid '11. The liquid may e introduced into the receptacle through a passage closed by the screw m. The armature is secured to a white glass target k, which is vislble only when in contact with the glass window g.

The armature is cut away to form a recess t for asupport s. A hole u, extendin from the upper end of the recess, receives t e upper end of the tilting su ort s, the lower end of which is pivotally helil in a groove n in the floor of the receptacle f.

The armature his so supported that the signal tar et la is in proximity to the window and is visible therethrough when the armature is not attracted by the magnet. When the electromagnet is energized, the target 7:: is drawn inward and concealed by the fluid.

Any other suitable means of normally holding the face of the armature against the window may be used, and the particular means here shown and described is not an essential 'feature of my invention. I

Grooves Z, extending across the surface of the target, facilitate the escape of the liquid from between the face of the target and the window when the armature is moving toward the window and also facilitate the rapid motion of the liquid in between the target and the Window when the armature is attracted. The tendency of a film of the liquid to cause the face of the target to adhere to the glass window is thus overcome, and the operation of the signal is rapid and certain.

- The receptacle f is of course composed of some non-magnetic substance and is prefer-V ably metallic. Any suitable non-corrosive hquid may be used in the receptacle. I have found that commercial benzole, suitably colored, preferably cutting asphalt in the benzole to give the esired de thoi color, is

thorou hly satisfactory and particularly ada te to use with my annunciator. I at I,claim is- 1. In an annunciator, the combination with a receptacle inclosing. a si al-target and a colored liquid, and rovi ed with a transparent window throug which the tarfrom the shell 0 and a colored liquid inelosed in said chamber,

get is visible when in contact therewith, an electromagnet and its inclosingshell, separate from said rece tacle, and-an armature connected with sai signal-target to operate thesame. I 2. In an annunciator, the combination with an electromagnet and its inclosing shell, of a hermetically-sealed chamber separate the magnet, an armature a target-signal secured to the armature, and a transparent windowin the chamber through which thetarget is visible when the magnet isdenergized.

target and provided wit 3. In an annunciator, the combination with an electromagnet, of a plate upon the rear of a which said magnet is mounted, a hermetically-sealed chamber separately mounted on the front of the plate, an armature and a colored liquid inclosedin said chamber, a target secured to the armature,

and a transparent window the chamber through which the-target is visible when the magnetisd'e'nergized.

4. In an annunciator, the combination with a signal-target having grooved channels across its face, a receptacle inclosing said a transparent window, a colored fluid in'the receptacle, an

-electromagnet,'and an armature connected with the target to operate the same.

5. In an annunciator, the combination w1th an electromagnet, of a plate upon the rear of which said magnet is mounted, a "hermetically sealed chamber separately target to operate the same.

mounted on the front of the plate, a signal target having grooved channels across its face 'inclosed in said chamber, an opaque liquid in the chamber, an armature secured to the target, and a window in the chamber toward and from which the armature is adapted to move the target.

6. In an annunciator, the combination with a hermetically-sealed receptacle having a transparent face, of a plate upon the face of which said receptacle is mounted, a fluid composed of colored benzole inclosed in said receptacle, a signal-target. movable in the receptacle toward and from the face thereof, an electromagnet separately mounted upon the rear of said late, and an armature adapted to operate t e target.

7. In" an, annunciator, the combination with a hermeticallyssealed receptacle, of 'a fluid composed of benzole colored with asa liquid in said rece tacle, a signal-target in said liquid, means or preventing the adhesion of the target to the window, an electromagnet, and an armature connected with the tar et to operate the same.

a witness whereof I hereunto subscribe my name this 4th day of September, A. D.

CHARLES .0. BLAKE. Witnesses:

SAMUEL HEIMLICH, E. J. BURKE.

ophaltum inclosed therein, a signal-target

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