US2012754A

US2012754A - Sound signal

Info

Publication number: US2012754A
Application number: US363183A
Authority: US
Inventors: Robert M Critchfield
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1929-05-15
Filing date: 1929-05-15
Publication date: 1935-08-27
Anticipated expiration: 1952-08-27

Description

Aug. 27, 1935. R. M. cRrrcHFlELD SOUND SIGNAL Filed May l5, 1929 linllllllnlltllrnlrlrl .nllll Patented Aug. 27, 1935 v SOUND SIGNAL Roberta-lmA Critcheldi Andersonylndzi assigner,-

by :mesne f assignments, tof GeneralA Meters A Cor- Y porationI Detnoit,-;Mich., acorporatien of'Dela-:

ware. Y

Application'-Ma`,y 15,v 1929,` Serial "No`.' 363;'183

Claims.; (01.1177-7) This inventiony relates to improvements. in. there is secured one end of a blade spring 32"vvhi`c`hA sound signallingl devices A and is particularly. extends;` toward the axis vof 'the base parallel'vvi'th .adaptable to that class'` of sound'signal 'for use themain' mountinglfranie 2|.`V The contacts of l' onrm'otor driven vehicles. the interrupter mechanism or circuit controller- Y 5 Itis 4onekrof the objectsof the present invention; areinsulatinglymounted upon this portioni23uoi" 5 to provide a sounding signal vor horn of simple thebracket 22. A resilient plate "33 has avfoo't' structure and design, and Whichmaybe produced portion-adapted to be secured insulatinglyto Ythe cheaply i and with a expenditurel of bracket 22, and the free end of 'said plate is proflabor;- vided with a y movable" contact' element 34" l y Another object g-is to provide ahorn or sound which cooperates With-'a stationary 'Contactel-` 10"" signal that Willgive an attractive warning sigment' 35 'Supported hva contactrnnsulat: nal,l -thatmay be distinctlyheard atsome distance ingly secured to the bracket' 23b5'i screws 31.` B v'V andabove the usual din-of city traffic;l reference to Fig. 2 `it` Willbe clearlseen ho'wthe" Another object ofthis invention isv to provide screws Sia-re assembled with 'a washer '33",1'a'non-'- A a -sound signal of attractive-design; and one conductingwashe'r 3g;bracketfijnoncondlictingV 15" Whichwill-be more consistent with presentw day bushing 15S," nonconductin'g'` washers 4H Contact automotive engineering', yetV adequately perform" spring j'fspacers fbladespring Sfandinally? the function for which it is intended;` i the b1acket23." The Contact' supporting 'ele'inntsl"A Further objects and advantages ofthe present, 33fand Sare'providedwitlitheA suitableleadsll' i invention will be apparent from theol1oWing, delyr and l which "ultimately coinbinefinto' tliecoin 20 scription,referencebeinghad to theaccoxnpany-f mon 'cable 45 which communicates'with 'anfaplf ing drawing wherein-ga preferred embodiment-of propriatesvvitch and enengy'source.A i one vforn1-ofthe Apresent invention is-clearly An yangular bracket 46 'is secured to th'e'lfreewy shown. end of theblade spring`32 and has an adjustable" 111th@ drawing: i screw Ata; supported at its`freeend andi is 'lonckedwgg" Fig. 1 is a rear view-o1" myimproved sound sigin' the adjusted DOSOII by E 100k HU'WT nal.Withparts-shown-inhalf ysectionforclea'rness screwbeing vadapted to engage 'themeiriber' '33"' of. illustration.V carrying 4the movable vcontact'STthrm'ifgh a non-Q Fig. 2 is a section througlfl mvsoundsignal4 conducting Wafer'Linterposedtherebetween;` A

A device substantially'as indicated bygtheline'and4 rovdorf'armature shaft 5"i's securedto' th'e' free 30"" arrows-2 2 of Fig.K 1.-v f Y end.` of the blade spring '32and'extendstoward' Fig.` 3 is .a frcnt viewof my-so'undsignal, anew th'efdia-phragmSibeing'secured thretobymears Fig. 4 is a seeupnal View similar-mrtg.2,-butof clamping Collars 5i* andtiwesse'd against? ofa modified form: Oppositesides'of the diaphragmlbymeans' of 'a nutl Referring'rtdthe'drawing the-nurneralillude-"-n 53; provided'at the 'endof'the rod 5G', Whiclinltggt A signates a b-aseaproviding a mainmounting p1atalso'holdsa toneinordiiying disc 54"-in position form 2Iupon.which is Y:supported the operating-W on Athe rod andin iront'ofthe`diaph1agm`29i'a mechanism of the -hornand-theAmountingiplat-fW suitable"spacer'54dl being inserted between'tthe formisapertured forreception ofalmagnet motor, dSC'and'alprlgclal 52 JAll"tlllfl'ttllle'"55S 40 t thelmetalpunched. out l orf the-bottomto -fornfr the carried: on `,the `-rod' 5" 'adiacent" the' ifree end` 'of 'T40 aperture being .bent 1115.120.. provide@bracket-nf the-spring 32, said armaturebeing:maintained having. a portion parallellwith but spaced-fromw iILIlOrmal pOSiOl'by' 'Ghe Spring "32 rl'dth da?`4 themain mountingplatformZl The-base?! is Dhlgmgf Y providedWith' anpuWardWXtendng flange u5 -f The* armature is recip'rocatedby 'means' o'f' screws v26 -which -passthroughapertures .inj-'a f a eld frame E@ which is supported on the mount? flange Zini la sounding boardorclar'nping ring f ingplatforrn Ziin any':desirable'manner.' The'f 28,-to secure said soundingfboard to thebase.V lA A field frame and the` armature mayeomprise" "a diaphragmi is interposed between the flanges 25 plurality' of 'magnetic'plates' riveted togetheras isr v L and 21 of thebase and sounding'board respectivee well known'to those schooledin the'art; and the' 50 'y ly and is clamped therebetween bygmeans ofr eldiframe. may be grooved as'at 62 'a"nd"63"forNl screws 26,', lckvvashers -3i) and nuts or spacers 3l,- .K receiving a'iield Winding 64. ".Thecentral portion"`fthus provid'ng a ryieldable partition betvleenthel of themagneticframe is'bored at 65 ,W ithin'whieli base-'and thefsoundinguboard. is disposed the armatureshaftii ofthe magneticAA ii" el.' Uponthe^parallel-portion 23 "of thebracket'22motor;the"aperture"being'sufoient1ygreater in `55 diameter th-an the shaft as 'to be out of contact therewith at all times.

In the preferred form of my invention the sounding b-oard 28 is substantially cup shaped, or of the cross section generally exhibited in Fig. 2,. and the bowl portion thereof is apertured at 'Hl which leaves a plateau 1| of metal substantially parallel with and spaced from the rdiaphragm and tonemodifying disc 54. This den'esa tone chamber l2, within which is .disposed the tone modifying disc 54, and, which it may be said iS defined by the tone producing elements. ,At a

In a modified forrnV of Y the device,ior that form illustrated in Fig, fl, the sounding board 28a con-` forms only to an annular flange `or rib o f theV clamping ring 21, the main portion of the sounding board or plateau vbeing entirely omitted.

' "of the preferred or the modified form, is mounted However,y in each instance the tone modifying disc 54 has free airaccess to the open end or bell O f thesound signal as will presently appear.

The' structure thus far described whether it be within a projector or sound reflector'as clearly illustrated in the drawing, and sol that the sound producingV elements are grouped substantially at or near the focal point of the reflector. The reflector is indicated as atti) and is preferably of parabolic form, the bell thereof terminating in a rolled edge 8|, and is provided at specified points with dedentations 82apertured to receive attaching screws 83 received by the aforesaid nuts or spacers 3l. In order to permit the reflector 85 to vibrate at its`own. fundamental frequency 'or function most efficiently, the dedentations and attaching' screws 83 are located substantiallyV at nodal points in the said reflector, so' that the ultikmateA sound signal produced will be a'combination of frequencies produced'by all ofthe above specified tone elements superimposed upon the fundamental tone of the reflector itself.

YFor attaching the sound signal to a part of the vehicle an attaching bracket 85 is provided with offset ears 86 which may be secured to the horn assembly by two of the adjacent attaching screws 83 f passing therethrough and into the spacers 3l, asV v illustrated. This 'bracketprovides for mounting' the sound signal upon the crossrod or other con- Y venient part of the automotive vehicle. ToY protect the magnet motor and also to insure that the frequencies vproduced by the tone'elements will,` be 'imposedupon the reflector Sii, the driving unit or, power `plant of the horn is provided with the motor housing 9D fittingY closely about the unit and provided with the flange-d ears 9| apertured' to receive attaching screws 92 driven therethrough n netic motor for actuating said elements, said re-. 65

and into the flange 25 of base 2li as indicated in Figs. 2 and 3. A gasket 93 being inserted between the motor housing and base plate making a vtight n jointl and reducing the noise.

It win be noted from the above description that' the sound signal embraces a reflector and a tone producing unit grouped at or near the focal point of the reflector so as tomake for the greatest efficiency of the device, and that the motor ing unit causes the diaphragm 29 to vibrate at 10 its set frequency, which also causes the tone modifying disc 54 to take up its vibratory movement partly due to the operation of the driving unit i and partly due to the sympathy it has for the These elements when 15 3 vibrating diaphragm 29. actuated pulsate the air content of the tone chamber i2 driving the air through the apertures FB of the Asounding board so that the vibrations strike upon and are thrown back by the reflector 80 z through Vthe substantially annular channel or 2U throat 95 between the reflector and the edge of the driving unit. The sounding board 28 adds to this sound 4of combined frequencies a distinct tone of its own part of which is contributed to by the hammering of the armature shaft 5B upon 25;.:

the Vanvil 'i3 and part of which is due toits sympathetic responseto the frequency of the diaphragrn and disc. These sound frequencies whenimposed upon and reflected by the member QQ,

and intermingled with the fundamentalV fre- 3fm quencies thereof produce a sound signal ofstrikging quality that is very desirable in theL pnesentg age of automotive industry. The ultirn-atel-p1qod-y.. uct of such a sound signalling deyicelmaybeg characterzied as one of low fundamentalmltll 35 superimposed with higherV frequenciesiouf, contrasting color,interming1ed with many-.oyer tones of substantial timbre.

In the modied form, tha-operation is essentially the same, in fact islthesarne except for the .10

function ,of the sounding bpard. The sound product is noticeablykdiiferjent in timbre from that of the preferredmfoilrn, for herer the sound product is the result of the combined frequencies of the diaphragm 25J and the tone modifying disc 45 J;

The 503 invention as herein disclosed, constitutes a pre- 5-5 ferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A sound signal device comprising in'combi- 60 natiorna resonating reflector, a magnetic motor, means supporting the motor within said reflector, and tone producing elements near `the focal point ofsaid reflector, and means driven by said magflector and magnetic motor being connected substantially at nodal points of said reflector.

2. A sound signal device comprising in combination, ahorn projector including a cupped resonating reflector, a diaphragm, a resonating disc, 70

means mounting the diaphragm within the said reflector, a base, drivingv means supported from Y the base for vibrating the diaphragm and disc, a sounding board securedto the diaphragm edge, .the driving means nhaving apart periodically en- 75 gageable 'with the sounding board during diaphragm vibration, the diaphragmV and sounding board enclosing the disc so as to form a tone chamber, and means spacing the edges of the sounding board and diaphragm from the reflector to allow free passage of the reected sound Vibrations therebetween.

3. A sound signal device comprising in combination, a base, a resonating reflector, a diaphragm and sounding board, means at the edges of the diaphragm and sounding board securing them to the base and spacing them from the reflector, a motor, means connecting the motor with said diaphragm and for actuating Said sounding board, said connecting means extending through said diaphragm and cooperating with a part on said sounding board to actuate the sounding board. Y Y

4. A sound signal device comprising in combination, a resonating reflector, a motor, means supporting the motor from said reflector, tone producing elements comprising a diaphragm and a disc, means driven by said motor for actuating said elements, said supportingmeans positioning the tone producing .elements between the motor and the reflector, and said securing means being located at points substantially in the nodal region of said reflector and adapted to maintain the motor and reector in spaced relation.

5. A sound signal device comprising in combination, a resonating reflector, a motor, tone producing elements, comprising a diaphragm, and tone modifying disc secured thereto, a sounding board having an edge portion secured to the diaphragm and cupped to enclose said disc, means driven by said motor for actuating said elements,

' and for striking said sounding board, and means for mounting said motor and tone producing elements at points substantially in the nodal region of said reector so as to locate the tone producing ROBERT M. CRITCHEIELD.