US1481897A - Buzzer - Google Patents

Description

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IpVenbor. I Ches'tr-zr Hail 4 His Attorngy 55 tion with a pair Patented Jan. 29, 1924.v

UNITED STATES PATENT OFFICE.

CHESTER I. HALL, OF FORT WAYNE, INDIANA, ASSIGN OR TO GENERAL ELECTRIC COM- PANY, A CORPORATION OF NEW YORK.

BUZZER.

Application filed July 6,

T all whom it mdy concern:

Be it known that I, CHESTER I. HALL, a citizen of the United States, residin at Fort \Vayne, in the county of Allen,- tate of Indiana, have invented certain new and useful Improvements in Buzzers, of which the following is a specification.

My invention relates to a buzzer and more particularly to one in which no auxiliary contact devices are necessary.

In the past, b-uzzers whether adapted for operation with alternating current or direct current have been so arranged that contact making arrangements were used, whereby the armature of the electromagnet included in the buzzer is rapidly vibrated in accordance with the rapidity of the making and breaking of the electric circuit. iVith my invention such auxilia contact devices are entirely obviated provi ed the buzzer is connected to an alternating current circuit- Furthermore, I arrange matters in such a.

way that the sound produced by the buzzer is primarly due to the striking of the armature against the pole of theelectromagnet, and not to the vibration of the armature. This produces a distinct signal, and it is possible to operate the apparatus on commercial frequencies such as or 60 cycles. It is thus the main object of my invention to provide an electric signalling device extremely simple and inexpensive to manufacture. Other objects making for simplicity and reliability will become apparent the description proceeds. For a better understanding of my invention reference is to be had to the accom anying drawing in which Fig. 1 is a lon itudinal sectional view of the buzzer;and ig. 2

is a top plan view of the same.

Referring now more in detail to the drawings, in which like reference characters refer to like parts throughout, a member 11 of magnetic material is provided, so de signed that it may conveniently be punched from thin sheets. This member 11 serves both as a support for all of the parts of the buzzer and also as the core for the magnet. To form a U-shaped core the end 12 of the member 11 is bent up as shown to form 0 one of the limbs of the U, and the central portion is struck up in the process of stamping to form the other limb 13. Upon this limb 13 is located the energizing coil 14, the terminals of which are in electrical connecof binding posts 15 and 16 1921. Serial No. 482,817.

supported on the member 11. One end 17 of the coil 14: is directly connected as by soldering to the post of shown in Fig. 2, while the other end 18 is grounded on the member or plate 11. The terminal 16 is insulated from the member 11, while the terminal 15 is grounded on this member. An aperture 19 is appropriately located for attaching the buzzer to any flat surface, such as a Wall. The mode of constructing member 11 as herein described is extremely simple and inexpensive, and produces a buzzer having a minimum of parts.

The armature 20 of the electromagnet is made of a flat strip of resilient material such as spring steel. It is attached at one of its extremities 21 to the limb 12 of the U-shaped core by any appropriate means, such as the rivets 22. Its free extremity extends over the other limb 13 of the U-shaed core and is arranged so close to the pole t at upon energization of the magnet 14 this resilient armature periodically strikes this pole piece with a frequency equal to that of the source of supply. No auxiliary contacting devices are necessary for the operation of this buzzer.

The operation of the device is apparent from the foregoing description. All of the parts making up the buzzer are extremely simple and easily assembled, and may be very inexpensively produced in large quantities.

While I have shown in the accompanying drawings but one embodiment of my invention, I do not Wish to be limited thereto but aim to embrace in the appended claims all modifications falling fairly within the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. An'electric signalling device of the alterna-ting current buzzer type comprising a sheet metal stamping forming the base, terminal support and stationary magnetic circuit of the device, the stationary mag netic circuit of said device being in the form of a U made by bending spaced por- -ti0ns of said sheet metal stamping at right angles to the base, an energizing coil wound on one limb of said U and connected to terminals on said base, and a member of resilient magnetic material secured at one end to the upper end of one of said U limbs and extending adjacent the upper end of the the terminal 16 as other limb, thereby substantially completing the magnetic circuit, whereby the free portionsv of said resilient member is caused to vibrate against said other limb when the coil is energized.

2. An electric signalling, device of the alternating enrrentbuzzer type comprising an integral sheet metal stamping of magnetic material bent up at one end and struck up from the central portion to form a U-shaped core and terminal support, terminals supported thereon, an energizing coil on one of the limbs of the U-shaped core connected to said terminals and a resilient armature of magnetic material supported on the other limb extending adjacent said first mentioned limb, thereby nearly completing the magnetic circuit of said core whereby the tree portion of said arn'iature is adapted to vibrate against said first mentioned limb when said coil is energized by alternating current.

In witness whereof. l have hereunto set my hand this 1st dav o July. l92l.

CHEST ER I. HALL.

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