US718235A - Polarized telephone signal-bell. - Google Patents

Description

- E. E. YAXLEY.

POLARIZED TELEPHONE SIGNAL BELL.

APPLICATION FILED MAR. 13, 1901; F0 MODEL.

PATENTED JAN". 1a, 1903.-

UNITED STATES PATENT OFFICE.

ERNEST E. YAXLEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN ELECTRIC TELEPHONE COMPANY, OF CHICAGO, ILLINOIS, A CORPO- RATION OF NEYV JERSEY.

POLARIZED TELEPHONE SIGNAL-BELL.

SPECIFICATION formmgpart of Letters Patent No. 718,235, dated January 13, 1903. Application filed March 13, 190i. Se ialNO. 50,967. (No model-1 T0 ctZZ whom, it 777/Cby concern.-

Be it known that I, ERNEST E. YAXLEY, a citizen of the United States of America, and a resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Polarized Telephone Signal- Bells, of which the following is a specification.

In telephone systems, usually at subscribers stations, an audible signaling device, usually a polarized bell,'is employed to give a signal whereby to call the subscriber to the telephone. This apparatus comprises a frame, a pair of electromagnets, a permanent magnet, an armature upon which the electromagnets and permanent magnet act, and a bell striker-lever operated by the armature to strike the gongs of the bell.

My invention relates to certain structural details of improvement in a polarized bell of this character, and has for its object the provision of means whereby the adjustment of the armature to determine its proper stroke or movement may be effected with facility and accuracy, so that the gong-striker may be adjusted to the proper stroke with accuracy, and to provide a construction which shall render the apparatus more substantial and less liable to get out of adjustment.

Reference may now be had to the accompanying drawings, in which- Figure 1 is a side elevation of the improved polarized electromagnetic ringer or bell apparatus. Fig. 2 is a view of the under side of the yoke and plan view of the armature, and Fig. 3 is a front elevation of the improved electric bell apparatus shown in Fig. 1.

The electric bell consists of a frame composed of the plate A, the bars, posts, or standards B B, and the yoke D. The permanent magnetEis connected,asusual,to the connecting-plate A and extended downwardly until its lower end is below the armature H. This armature H is pivoted in the downturned ears H and the striker H attached to said armature, projects upwardly through an enlarged orifice H in the yoke. The electromagnets J J are held in place by means of the frame, and the lower ends of the cores J J of said electromagnets project through and are held within the yoke D. These cores by so projecting through and beyond the plane of the yoke are brought into a position to act upon the armature H, which is positioned beyond the said yoke D. The bell-striker H is placed between and operates upon the gongs Kin the usual manner.

From the foregoing description it will be observed that the armature is positioned beyond the yoke D of the frame instead of be ing between the yoke and the electromagnets, as is usually the case. Passing the ends of the coresthrough the yoke and to a point beyond the plane of said yoke brings them into inductive proximity with relation to the armature. By thus disposing the armature it is possible to adjust the stroke or vibratory movement of the same with facility and accuracy, and thus obtain an accurate movement or vibration of the striker with relation to the gongs. Further, by passing the cores J of the electromagnets J through the yoke D a more substantial and solid structure is thereby obtained, which is less liable to get out of adjustment when locked in place by means of the nuts L on the connecting-bars B. This is evident, as the cores are firmly held in place at their lower ends instead of being permitted to remain unsecured, as is usually the case, and, further, the said cores are brought by being thus projected beyond the plane of the yoke into inductive proximity to the armature H, which is positioned beyond said yoke. In this construction the permanent magnet, as E, is not used in any way for varying or adjusting the armature. A very bad feature of construction is thus avoided, owing to the liability in construction where it is so employed of the hardened-steel magnets to become broken,due to the strain thrown upon them by the adjusting-screws or other means. In this device the adjusting is accomplished through the nuts L L on the posts or rods B.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A polarized bell comprising a permanent magnet, a pair of electromagnets having projecting cores, a yoke through which said cores project, adjusting devices for causing a bodily movement of said yoke upon said cores,

an armature pivoted upon and outside of said yoke, a pair of gongs, and a striker mounted to vibrate With said armature.

2. The combination of a gong, a pair of electromagnets having projecting cores, a yoke through which said cores project, an armature pivoted upon and arranged outside of said yoke, a permanent magnet having one pole free and the other secured to the said cores, a striker mounted to vibrate with said armature, and adjusting devices independent of said magnets for adjusting said yoke.

3. The combination of the plate formed with a recess at its middle, the two electromagnets secured to the middle portion of said plate, the permanent magnet having one pole free and the other secured in said recess, a yoke through which the cores of said magnets project, an armature pivoted upon and outside of said yoke, screw-threaded members applied to the ends of said yoke and adapted for adjusting the latter bodily along the said cores, one or more gongs, and a striker mounted to vibrate with said armature.

4. In a polarized bell, the combination of a pair of electromagnets, a permanent magnet having one pole fixed and the other free, a

yoke having openings through which the cores of said electromagnets project, an armature pivoted upon the yoke between the latter and the free pole of said permanent magnet, suitable screw-threaded members for adjusting the yoke bodily along said cores, one or more gongs, and a striker mounted to Vibrate the said armature.

5. A polarized electric bell, comprising a pair of electromagnets having projecting cores, a permanent magnet, adjustable screwthreaded members supported at opposite sides of said electromagnets, a yoke having its opposite ends supported by the said screwthreaded members, said yoke thus supported for bodily adjustment being provided with openings adapted to receive the projecting end portions of the said cores, an armature pivoted on the yoke and located between the ends of said cores and one pole of said permanent magnet, a gong, and a striker mounted on said armature and projecting through said yoke.

ERNEST E. YAXLEY. Witnesses:

CHARLES C. BULKLEY, HARRY P. BAUMGARTNER.

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