US2352602A

US2352602A - Electric horn

Info

Publication number: US2352602A
Application number: US392999A
Authority: US
Inventors: Eric H Church
Original assignee: BENJAMIN ELECTRIC Manufacturing CO
Current assignee: Benjamin Electric Manufacturing Co
Priority date: 1941-05-12
Filing date: 1941-05-12
Publication date: 1944-07-04
Anticipated expiration: 1961-07-04

Description

July 4, 1944.

E. H. CHURCH ELECTRIC HORN-A Filed May 12. 1941 July 4, 1944- E. H. CHURCH I 2,352,602

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9 1 9 Il "HIIHIL /m WIM Patented July 4, 1944 ELECTRICYHORN' Eric H. Church, Desv Blaineswlnll., .assignor to Benjamin Electric Mfg. Company, "Des'Planes,

Ill., a corporation of Illinois Application May-12, 194i, serial No. 392,999

My invention relates to electric horns. -One of the objects of my invention is to produce an improved electric horn of the diaphragm and projector type in which the electric control apparatus is so enclosed as to prevent aame which might result from an explosion within the enclosure from escaping from the enclosure and igniting any inflammable mixture which might exist in the immediate vicinity. A further object is to provide an improved adjustable mounting for the coil and cordfof the electrical apparatus with respect to the armature.

'Further objects' and 'advantages will appear from the description and claims. v

Ink the drawingslin which one embodiment of my invention is shown,

Figure 1 is an axial sectional View of an electric'horn on the line l-l'of Fig. 2; Fig. 2 is an axial sectional View substantially on the line 2-2 of Fig. l; Y

Fig. 3 is an axial sectional view substantially on the line 3-3 of Fig. 1;

Fig. 4 is a bottom view of the horn, with the lower part of the casing or housing broken away.

Referring to the drawings in detail, the construction shown comprises a dished housing I which may be a casting, a cover 2 for the housing, a vibratable diaphragm 3, a projectorhorn 4, and an electrical apparatus mounted on the cover inside the housing for actuating the diaphragm. The projector horn, diaphragm, and electrical apparatus may all be mounted on the cover 2. A plug-in separable connector is pron Alln order to prevent any possibility of ignited gases or the like escaping from the housing in the event of an explosion or the like within the housing, the cover is provided with a plug portion I3 having a tapering conical machine-finished surface for tting ,snugly= in a corresponding tapering, conical,V outwardly flaring, machinenishedentrance 'opening in the housing. The

titi-.ing is made so accurately and the distance 6 claims. Miel. 177-;7)

from the inner point of contact Mito the outer point of contact l5 betweenl the machine-finished surfaces issofgreatthat Vignited vgases cannot reach the atmosphere from the vinside ofl the housing. w

In order to clamp the plug part of the cover securely in lplace in the conical opening in the housing, a clamping ring I6 is provided having an internally threaded skirt Vvportion Il threaded onto van externally threaded portion of the housing. The inwardly extending flange of this clamping ring may-engage anysuitable portion of the cover unit. As shown, itengages the outer portion of the annular basev i8 of the projector horn.k When the clamping ring is screwed down it forces the tapered plug portion i3 snugly into the tapering entrance opening in the housing. The diaphragm and projector rhorn are secured to the cover by means of screws i9 extending through registering openings in the .projector horn, ilange.- and diaphragm and threaded into blind tapped holes Vin the cover. Due to the use of these blind tapped holes, there isno possibility of ignited gases escaping at the point of connection betweenvthe cover 2 ,and the diaphragm and horn.

The electrical apparatus shown for operating the diaphragm comprises a single coil winding 20, an E-shaped laminated core 2l about the centralvarm 22 of which the coil extends, and an armature 23 aligned with the lower edge of the core2l. This armature isvconnectedwith the diaphragm 3 by means of a plunger 24 threaded into the armature and extending through a long sleeve 25 on the cover. The sleeve has .a smooth bore with which the smooth outer surface of the plunger has a smooth slip iit'rso that the escape of ignited gases between the plunger 24 andthe-cylindrical bore of the sleeve25 is pre'-y ventedj, The escape is of course further hindered by the fact that the diaphragm 3i extends across the upper side of the cover and is provided with a steelring 26 on one side thereof for effecting a seal. In order to position the 'diaphragm and plunger 24 accurately, studs 26aare securedto the ring 2G and extend through registering holes in the diaphragm 3 and into registering holes in the cover 2. A

The Vcentral arm of the 'E-shaped core hasV a central opening 21 into which theA elongated sleevev25 extends. thecover by means of a pair of Leshaped'brackets 28 having wing portions 29 securedbyrivets 30 u to the outerY arms of the core 2| and having` foot This core is supported from supporting feet 3| are gripped. By means ofr this adjustment, Vthe gap between the armature justed position.

said enclosure, said cover having a sleeve portion having a long, smooth, cylindrical bore, and transmission between said electrical apparatus and diaphragm comprising a plunger having a smooth slip t in said cylindrical bore.

` 3. An electric horn comprising a dished housing, a cover for said dished housing forming therewith an enclosure, a diaphragm `mounted on said cover outsidesaid enclosure, a projector horn mounted outside said enclosure, electrical .apparatus mounted on said cover inside said enclosure for actuating said diaphragm, said dished and core may be finely adjusted and held infadling the coil circuit comprises a pair oi contacts 35 and 36 to which the

wires

31 and 38 are connected, respectively, the contact 35`fbeing springvided for the contacts. The connections for the switch contacts comprise the two wires 3l and 38 leading from the Contact blades to the switch contacts. It is desirable to provide a condenser 44 in parallel Vwith the switch bymeans of the `

wires

45 and 46. The condenser has the elect of helping to snuff outthe arc to neutralize the magnetic field quickly. Thehousing is provided with the usual opening 4l for .connection with the conduit through Vwhich the feed wires eX- tcnd. The diaphragm 3 may be securedV to the The upper Contact is controlled Vplunger 24 by means of a nut 48 threaded onto a reduced extension of the plunger and extending through an eyelet 49 riveted onto the diaphragm, which eyelet clamps the packing washers 50 in place. f

Further modifications will be apparent to those skilled in the art, and it is-desired, therefore, that the invention be limited only by the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure lby Letters Patent is:

1. Ari electric horn comprising a dished housing, a cover for .said dished housing forming therewith an enclosure, a diaphragm, electrical apparatus mounted on said cover-inside said `enclosure for actuating said diaphragm, said diaphragm beingY mounted outside said enclosure and said vcover having an `opening.r-therethrough, and transmission from said electrical apparatus to said ydiaphragm passing through said :opening, said cover having provision for hindering gas from passing from said enclosure lthrough said opening when an explosion rtakes :place in said enclosure .and having provisions for hindering the escape of gas past the peripheral edge of the cover.

2. An electric horn comprising a dished 'housing, a cover for said dished housing forming therewith an enclosure, .a -diaphragm,gelectr.ical apparatus mounted on-said cover inside ysaid enclosure for actuating saidv diaphragm, said diaphragm rbeing mountedV `on said coveroutside "conical,

`=housing having a tapering, conical, outwardlyflaring, machine-finished, entrance opening, said Acover yhaving a plugportion having a tapering', machine-iinished surface for fitting snugly in said conical opening, and a clamping ring surrounding said horn and threaded onto said housing member for exerting pressure on said,v plug portion to force it snugly into said conical opening.

V4.' An electric horn comprising a dishedA hous- .ingfa cover for said :dished housing forming therewith an enclosure, a diaphragm mounted outside said enclosure, electrical apparatus Amounted on said cover inside said enclosure for actuating said diaphragm, said dished housing having a tapering, conical, outwardly-flaring, machine-finished, entrance opening, said cover having a plug portion having a tapering, conical, machine-i'inished surface for tting snugly in said conical opening, and a clamping ring threaded onto said housing member for exerting pressure on .said plug portion to force it snugly into saidconical opening, said diaphragm being clamped between saidv'ringand plug portion.

5. An electric horn comprising'adished housing, a` cover for said dished housing forming therewith an enclosure, 4a diaphragmmounted on said cover outsidesaid enclosure, a projector horn mounted outside said enclosure, electrical apparatus mounted .on Vsaid cover inside said enclosure for'factuatingsaid diaphragm, said dished housing having a tapering, conical, outwardlyflaring, machine-finished, entrance opening, said cover having a plug portion having a tapering, conical, machine-iinished Vsurface for fitting snugly insaid conical opening, and a clamping ring threaded onto saidhous'ing member for exerting pressure on said Aplug portion to force it snugly into said conical opening, said projector horn having a ange clamped between said ring andplug' portion. k l V a 6. 'An electric horn comprising a dished housing, a'cover for said dished housing yforrfr`1i'ng` therewith an enclosure, a .diaphragm vmounted outside said enclosure, a projector'horn' mounted outside lsaid enclosure' electrical apparatus mounted on said cover insideV said enclosure for actuating said diaphragm, said dished housing having artapering, conical, outwardly-haring, machine-finished, entrance opening, said cover having a plug portion having a tapering, conical, machine-finished surface for fitting snugly said conical opening, and a clamping ring threaded onto said housing member for exerting pressure onsaid plug portion to force it snugly into-said conical opening, `said projector horn having a flange -c`lam`ped"between said ring and plugportion andsaid 'diaphragm being clamped between said 'ring `and plug portion.

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