US1865473A - Horn - Google Patents

Description

July s, 1932. c. M. LEE 1,865,473.

. HORN Filed Nov. 17, 1923 2 Sheets-Sheet 1 INVENTOR BY 65342)@ 9 #l 47W H L5 ATTORNEYS C. M. LEE

July 5, 1932.

HORN

Filed Nov. 17, 1923 Patented Julyis, 1932 UNITED STATES' 'A PATENT orrlcs curan mvnr Las, or ummm, omo, Assrenon 'ro 'nm am mnus'rams coxrANYLor imma, omda couronnes. or omo HORN' Appunti mea mummy, ma. sensi n. miga-1s. j

` This invention relates to signaling devices, i

relates to horns which include a vibratile member which is mechanically agitated to produce sound waves.

` In horns vof the typle specified,rthe vibra-V tory member or diap ragm is carried by a metallic frame which also carries the armature' and hammer by which this member is agitated. Vibrations from the amature or hammer are conducted through its metallic support to the frame, setting u chatter or some other vibration therein, which becomes intermingled with the sound waves produced by the vibratoryv member and has a detrimental eiect upon the tone quality of the horn.

It is an ob'ect of my invention to provide a pr ce sound waves which are free from metallic chatter, and which produce a sound of the nature of that of a fog horn. Anotherobject of m .invention is to provide a signal horn w erein means is provided to absorb vibrations passin between the hammer or armature and the me and which might cause, if not absorbed, the metallic chatter of the frame, permitting only the soundwaves from the vibratile member to be transmitted through the amplifier..

Another object of m invention rem'des in providing rubber was ers which are positioned to prevent the metallic sound vibrations being transmitted to the supporting frame, and to normally maintain the armature in spaced relation from the electromagnet and in circuit forming position.

These and other objects o my invention, and the invention itself, will be better understood when trken in conlectltio wiltlldthe accom anyi awings an e eta' specication illnugstrating two embodiments of my invention.

In the drawings- Fig. 1 is a partial sectional view of one embodiment of my device.

Fig. 2 'is an end elevation of the same de vice with the cover removed;

a metallic (signal device which whenV operated will Fig. 3 is a artial sectional view of another form of my evice; and 'f Fig. 4 is an end elevation of the device in Fi 3, the cover in Yboth being removed.

ferring to the drawings, in ,which like numerals of reference designate similar arts, the frame or main supporting element lllustrated at is, preferably, formed circularly of sheet metal with a central depressed portion and an outer flanged portion. frame plate 11'is fastened, by screws 12, upon the front ofthe flanged portion of the frame, such plate being open centrally at 13 to providea passage for sound waves, and also flanged at 14 to provide a mounting upon which is mounted an amplifying horn 115. Arvibratile member 16, shown here as a diaphragm, is. secured between the flanged ortion of the frame and the frame plate, m the usual conventional manner.

An electromagnet 17 of conventional type having windings 18 and a hollow core 19, is secured at one end against the rear wall of the frame by a hollow flanged stud 20 which extends through an aperture in the frame. A bracket 21, having its legs riveted at 22 to the rear wall of the frame, extends rearwardly aboutthe electromagnet, the bracket being preferably U-shaped when used as shown in Figs. 1 and 2. The end wall of the bracket perforated at 23 to align with the opening through the hollow core of the electromagnet and the opening in the frame. A hammer 24, for actuating the diaphragm 16, extends through the hollow core of the electromagnet, the aperture 23 in the bracketand through the opening in the frame, the end thereof being normally positioned adjacent the diap The hammer is threaded intermediate lts ends, and an armature 25 is screwed upon such threaded portion thereof normally adjacent the rear end of the electromagnet.

Resilient members 26, preferably made of I rubber or similar material and'formed as thick washers, arepositioned about the hamnut 28 is screwed thereon, bearing a retaining washer 29 which abuts the rear washer. By manipulating the nut 28 on the hammer, the degree of space between the opposite end of the hammer and the diaphragm can be regulated,

In Figs. l and 2, which I have just described, the hammer reciprocates centrally through the electromagnet, while in the embodiment of my device shown in Figs. 3 and 4 the hammer reciprocates at one side of the electromagnet. In the last mentioned device the electromagnet 17 is secured to the frame as previously described, but at one side of the central aperture therethrough. A bracket 40 is secured between the base frame and the electromagnet, extending upwardly at one side thereof and outwardly at its end 4l. An armature 42 extends across the rear end of the electromagnet, being mounted upon the bracket end 41 between rubber washers 43 by bolts 45. A retaining washer 44 is also maintained at the rear of the rear washer by the bolts. The Washers in this embodiment function the same as those described in the first described embodiment. The hammer ,24 is screwed through a threaded aperture 47 in the armature, extending through the central aperture in the frame member and adjacent the diaphragm. A nut 28 secures the hammer in desired adjusted relation to the armature and the slot 30 being provided in the end of the hammer for the insertion of a tool to screw the same in or out through the armature.

The devices illustrated are both of the grounded type, one end of the electromagnet windings being connected to the terminal 55, which is connected to a source of electric supply (not shown), and the other end of the windings being secured to-contact member 53. The contact member 53 is secured upon the bracket support 50 by screws 54, and is provided with a contact nger 56 projecting toward the armature. A contact member 57 is secured to the bracket in front of the member 53 and projects therefrom in the path of the movement of the armature.. l/Vhen the circuit is established by an op erator by a button or similar conventional switch, the magnet is energized drawing the armature thereto and striking the hammer against the diaphragm. When the armature is drawn toward the electromagnet the circuit becomes opened, whereupon the armature is returned to normal position b the rubber washers, where the circuit is agaln established. Such movement of the armature and hammer cause intermittent blows to be struck against the diaphragm as long as the operator permits the switch to close the electric circuit.

The rubber washers absorb any vibrations which might pass between the armature or hammer and the frame. These vibrations apppssibly, to the waves emitted by the frame ing in phase with those of the diaphragm, while those caused by the hammer or armature probably are slightly out of phase therewith. The resultant sound produced b the entire horn is in the nature of that pro uced by a fog horn and the quality of the tone is markedly superior and more vpleasing than that of pr1or types of electric horns.

The whole structure is supported upon an object to which attachment is desired by a bracket 60, and a cover, to prevent dirt associating with the hammer operating mechanism, can be placed over the rear end of the structure, such being conventional tothe art.

Various changes can be made in the details of construction described without departing from the spirit of my invention and the scope of the appended claims.

What I claim is 1. An electric sound producing horn comprising a frame, a diaphragm carried thereby, an amplifying horn element carried by' the frame in operative relation to the diaphragm, an electro-magnet secured to the frame, an armature cooperating with the magnet, a diaphragm hammer associated with the armature, a supporting bracket for said armature and hammer secured to the frame, and a pad of vibration absorbing material between the bracket and the hammer and armature.

2. An electric sound roducing horn comprising a frame, a diap ragm and horn carried thereby in operative relation to each other, a bracket extending from the frame, a pad of resilient nonmetallic vibration absorbing material carried by the bracket, a hammer and armature carried by the pad, and electric means carried by the frame for reciprocating said armature causing the hammer to intermittently strike the diaphragm.

3. In an electric sound producing horn, a frame, a diaphragm, a horn element and a diaphragm operating means carried by said frame in operative relation to said diaphragm, said diaphragm operating mechanism including a bracket supported by the frame, a magnet supported by the frame, a member, an armature adapted to be actuated by said magnet and disposed on said member and movable therewith, said member extending through the bracket, resilient vibration absorbing material comprising resilient washers disposed about the member adjacent each side of the bracket, a nut and washer disposed on the extremity of said -member Aand adapted to be tightened to securely clamp los' s lll the resilient washers between the armature and the washer.

4. In an electrical sound producing horn, a supporting frame, a diaphragm and sound chamber carried thereb in operative relation to each other, means or actuating the diaphragm carried by the frame including a racket, an armature supported by the bracket, an electromagnet supported on the frame v adapted to actuate the armature,vsaid armature including a magnetic member, a rod supported by thebracket adapted to carry sald member in spaced relation to the magnet, a nut and washer disposed on the extremity of' said rod and lpads of resilient vibration absorbing material inte osedv between the washer and the frame an the frame and the armature, said nut adapted to secure said reslient members securely between the washer and the armature and spacing said armature from said bracket. v

In testimony whereof I hereunto ax my signature this 12th da of November 1923.

Gumia MELVIN LEE.

Images