US744944A - Electric bell. - Google Patents

Description

UNITED STATES Patented November 24, 1903.

PATENT OEEIcE- PAUL G. TISMER, OF NEXV YORK, N. Y., ASSIGNOR TO THE BUNNELL TELE- GRAPHIC & ELECTRICAL COMPANY, OF NEW YORK, N. Y., A CORPORA- TION OF NEW YORK.

ELECTRIC BELL.

SPECIFICATION forming part of Letters Patent No. 744,944, dated November 24,1903.

Application filed June 21, 1902. Serial No. 112,592. (No model.)

To aZZ whom it mag concern.-

Be it known that 1, PAUL G. TISMER, a subject of the German Emperor, residing at New York, in the county of New York and State of New York, have made a new and useful Invention in Electric Bells, of which the following is a specification.

My invention is directed particularly to improvements in electric bells of the vibratory to or trembler type.

For a full and clear understanding of the invention, such as will enable others skilled in the art to construct and use the same, reference is had to the accompanying drawings,

1: 5 in which Figure 1 illustrates in plan view a full-sized electric bell embodying the features of my invention, the covering or casing to the operative parts, however, being removed. Fig. 2

is a side elevational'view as seen looking at Fig. 1 from left to right, the covering or casing being shown in position in this view and in section and the bell partly broken away.

- Fig. 3 is a perspective view of the frame which supports the operative parts, the arm which supports the bell proper being shown also in this View in dotted lines and broken off at one end. Fig. 4 is an enlarged sectional view taken through Fig. 1 on the line :1; 0c and as 0 seen looking thereat from the bottom toward the top of the drawings, the clapper and the bell, however, not being shown in this View.

Fig. 5 is a detail elevational view of a modified means of adjustment for the armature 3 5 and bell-clapper lever secured thereto. Fig. 6 is a detail sectional view through the base to which the frame is secured, showing a modified means of securing the covering or casing thereto.

Referring now to the drawings in detail, in all of which like letters of reference represent like parts wherever used, A represents the base which supports the entire apparatus.

F represents the supporting-frame, to which the different parts of the structure are secured, said frame being constructed in one integral piece, preferably of soft metal, such as brass or iron, and stamped or otherwise formed in the manner shown, so that the lower portion thereof has a plane surface adapting it to be secured directly to the base A by rivets through rivet-holes, E being a rectangular extension to which the magnets M M are secured by screws or rivets extending through screw-holes H H When the supportingframe F is of brass or other non-magnetic metal, of course the usual magnetic yoke for the magnets M should be secured to their ends between them and the frame.

I is an angular extension bent upward and then outward, so as to constitute a standard or support for the armature-lever, which is pivoted to said standard in pivot-holes o o.

J is a lateral extension bent slightly upward and then on a plane with the base of the frame, as clearly shown in Fig. 4-, said extension acting as a support for the adjustable contact P.

G is a curved extension at the rear side of the frame provided with notches or openings O O and a rectangular-shaped hole H at its outer end, said notches being for the purpose of adjusting the armature-lever through the agency of a retractile spring L, which is constructed, preferably, of one integral piece of metal bent in the manner shown in Fig. l and acting to serve the unitary purpose of a support for the armaturelever N and a flexible contact for the back contact of said armaturelever and also a yielding adjusting-spring, as will be described more particularly in connection with the description of the manner of assembling the parts.

H is an upwardly-extending arm provided with a rectangular-shaped hook at its upper end extending inward toward the body of the frame, said hook acting as a means for securing the covering or casing O in place in connection with a locking-spring L, secured directly to the base by a rivet, as shown in Figs. 0

1 and 2.

D is an arm or support for the bell, said arm being secured directly to the upper side of the frame F by rivets through rivet-holes, the bell B being attached to the outer end there- 5 of and directly in the path of the clapper carried by the armature-lever N. The arm D is made detachable from the frame, as shown,

so that when the bell is left off the instrument becomes a buzzer.

B and B represent the binding-posts secured to lugs or extensions integral with one end of the base, the post B being in metallic connection therewith and the post 13 insulated therefrom by washers W WV and both of said posts locked against turning by bending the extreme ends of the lugs to which they are attached upward, as shownin Fig. 2.

Referring now to Fig. 4, I will describe in detail the manner of securing the adjustable contact P directly to the frame F and in such manner that said contact is automatically locked after it has been turned back or forth for the purpose of effecting adjustment between it and the movable contact carried at the free end of the spring L. This adjustable contact is screw-threaded, as shown, and provided with an operating thumb-head T, having corrugated extensions, as shown. Said contact is secured in the upper end of an angular arm, which in turn is secured by a rivet extending through an opening K in the lateral extension J of the frame F. W W are washers similar to the like washers for the binding-post B said washers being of insulating material, as vegetable fiber, and S is a curved spring secured above the upper washer W with its free end in yielding contact with the corrugations of the thumb-head T, 40 being a conductor running to the magnets M.

The several parts of my novel bell are assembled as follows: The angular support for the adjustable contact P and yielding spring S for locking said contact are secured in place above the lateral extension J and insulated therefrom. This is effected by piercing the two insulating-washers W W, as vegetable fiber, by a pointed instrument, so that the indented portions thereof when placed in position will face each other, as shown. A rivet is then secured in place with the shank thereof in the opening through the washers, its upward end extending through a hole in the spring S and a corresponding hole in the rectangular standard with the end of the conductor 40 between the parts, after which all of the parts are securely riveted together. The act of thus riveting the parts together causes the washer and the outwardly-extending portion of the spring S to be bent upward by the lateral extension J, so that all of the parts are effectually locked together. The spring S is then turned over the top of the rivet in the manner shown, so as to act as a lock for the thumb-head T. The bell-support D is then secured to the frame F by rivets and the bell 13 attached thereto at the outer upturned end thereof. The frame F is then secured directly to the base A by rivets orin any preferred manner and the magnets M M are secured to the rectangular extension E by inserting screws through the holes H H Lugs or ears are stamped through the enlarged part of the spring L, so as to constitute a means of attachment for the pivot-pin. The spring L is then bent into the conformation shown in Fig. 1, and the armature-lever N and its attached clapper are then secured to this spring by rivets, as shown in Fig. 2. These parts are then placed in position with the ends of the pivot-pin restingin the pivotbearing 0 o of the extension I. The adjustable contact P is then put in place by rotating the thumb-head T to the desired point, the spring S locking it after each movement of the outer corrugations thereof. The free end of the adjustable spring L of the armature-lever is then lifted and locked in position in one of the locking-openings 0, de-

pendent upon the nature'of the adjustment required. The necessary connections are made between the magnets M and the hind ing-posts B B secured to the base, in the manner above indicated, the binding-post B being insulated from the base by washers W W in the same manner that the insulation was effected for the adjustable contaclLP. The cover is now slipped into position with an opening in one end thereof passing over the extension or hook H, the yielding lockingspring L falling into locking position in a depression or opening in the other end of said casing when it is lowered into contact with the base. The bell is now ready for operation and may be connected up in circuit in the usual manner.

In Fig. 5 I have illustrated in detail a modified means of adjustment for the armaturelever. In this instance the curved spring L is replaced by a spiral spring of the usual form secured to a rectangular-shaped pin screw-threaded, as shown, and adapted to fit through a rectangular opening H in the extension G, V being a nut for regulating the adjustment as desired, said nut resting against a shoulder formed by a bend in the extension G to prevent it from turning, or it may rest against a projection or indentation.

In Fig. 6 I have shown a modified means of securing the casing G directly to the base A. In this instance the casing is provided with a downwardly-extending portion of the cover C or alocking-spring L, which is adapted to be locked directly to the base by a wall of an opening through which it extends.

I do not limit all the features of my invention to use in connection with electric bells, as notably a number thereof might be used in connection with electric translating devices generallysuch, for instance, as relays and sounders-or in places where bindingposts and adjust1nent-springs or adjustable contacts are used.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

1. A frame or support for the parts of an electric bell constructed of one integral piece of metal F having an angular extension E for the magnet, an angular extension I for the bell-clapper, and a curved extension G and a lateral extension J for the adjustable 10 cured thereto; in combination with a series of locking-notches for varying the adjustment of the yielding spring, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of [5 two subscribing witnesses.

PAUL G. TISMER. Witnesses:

O. J. KINTNER, ,M. F. KEATING.

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