CA1150540A - Motor driven bell sound generating system - Google Patents

Abstract

ABSTRACT OF THE INVENTION:

A motor driven bell sound generation system constructed such that rotational movement of a motor is converted into reciprocative hammering operation or single directional striking operation of hammer means via a crank means, driving means with radial protrusions on the outer periphery thereof or lever mechanism, whereby the required quality and volume of bell sounding is produced. A resilient means comprising a coil spring-leaf spring combination or single coil spring may be arranged for conversion of the rotational movement of the motor into the hammering or striking operation of the hammer means between the motor and the hammer means. Rotational movement of the motor may be converted into reciprocative striking operation of the hammer means via a combination of driving member having latches on the outer periphery and a leaf spring. Alternatively rotational movement of the motor may be converted into swinging operation of the hammering arm or into reciprocative striking operation of the hammering rod via a worm gear and worm wheel mechanism and lever member.

Description

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The present inven-tiol. relates to a mo-tor driven bell _;ound c,enerating system in w'.ich a small size of mo-tor is .rcorE~orated for energizing the system, and more par~icularly to a bell sound yeneratin(3 sys-tem constructed such -thdt ro-tational movement of the motor is converted into reciprocative or turniny operation of the hammer, hammer arm or hammering rod so -~:hat s-triking or hammering effect is imparted to the bell gong which serves as a sound source.
It is an object of the invention to provide a new and ~nique motor driven bell sound generating system whi_h is capable of generating any required quantity and volume of bell sounding.
It is another object of -the invention to provide d motor driven bell sound yenerating system which is capable of easily select and determine the op-timum number of hamrnering or striking operation and working stroke of hammer means.
It is ano-ther object of the invention to provide a motor driven bell sound generating system which is simple in structure and easy to be manufactured.
The present invention provides a motor driven bell sound generatiny system comprisiny: a base; a gong mounted on the base; a hammer; an electric motor mounted on the base and having a rotatable drive shaft; resilient means, connected at one end to the hammer, for imparting reciprocating movernent to the hammer to strike the gong; and drive means, fixedly attached to the drive shaf-t, for impar-tincJ oscillation movement to the resilient means to thereby cause the reciproca-ting movement of the hammer.
The drive means may comprise a cran]c member ex-tencling perpendicular to -the .lXiS of the drive shaft, and w`..crein the '' ~;;;q .5~

resilient means connects the namrner to -the free end of -the crank nember and ex-tends generally perpendicular to the drive shaft, the resilient means being of an elongated shape and axially contractible.
Alterna-tively, 'he drive means may comprise a ratchet extending perpendicular to the drive shaft, wherein the resilient means is a leaf spring secured at one end to the base ar-ld carrying the hammer at the other end thereof, the leaf spring extending substantially parallel to the drive shaft and haviny an engaging portion engageable with the ratchet for the oscillation movement.
The present invention will now be described in further detail with reference to the accompanying drawings, in which:-Fig. 1 is a schematic illustration of the arrangement of the conventional electromagnetically driven bell sound generating system, wherein a part of the bell gong is par-tially shown in a sectional view.
Fig. 2 is a plan view of a motor driven bell sound generating system in accordance with -the first embodiment of the invention, wherein -the bell gong is removed for the purpose of simplification of illustration.
Fig. 3 is a front view of the motor driven bell sound generating system in Pig. 2.
Fig. ~ is a partial front view of the modified crank member in use for the bell souncl yenerating system in accordance with the first embodiment of -the invention.
Fig. 5 is a partial view of the mod:ifiecl crank member as illus-trated in E'ig. ~I.

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Fig. 6 is a vcrtical sectional view of the bell sound jener~ting system in accordance with the first embodirilent of -the invention, said system being secured to the bell gong.
Fig. 7 is a schematic plan view of the motor driven bell sound generating sys-tem in accordance with the second embodiment of the invention, whereir,-the bell gong is removed.
Fig. 8 is a front view of the bell sound yenerating system in Fig. 7.
Fig. 9 is a vertical sectional view of the bell sound generating system in accordance with the second embodiment of the invention together with the bell gong to which said system is secured.
lS Fig. 10 is a schematic plan view of the motor driven bell sound generating system in accordance with the third embodimen-t of the invention, wherein the bell gong is removed in the same sense.
Fig. 11 is a front view of the bell sound generating system in Fig. 10.
Fig. 12 is a perspective view of the formed leaf spring in use for the bell sound generating system as illustrated in Fig. 10 and 11.
Fig. 13 is a vertical sectional view of the bell sound generating system in accordance with the third embodiment of the inven-tion together wi-th -the bell gong to which said system is secured.
Fig. 1~ is a schematic front view of the motor driven .~ bell sound generating system in accordance with the fourth embodimen-t of the inven-tion, where:in the bell gong ~ith said systern secured thereto is shown in a vertical sec-tional view.
Fig. 15 is a plan view of -the bell sound generatincJ
system, taken in line XV - XV in Fig. 14, wherein the bell sound is partially shown in a sec-tional view.
Fig. 16 is a partial schematic plan view of the modified hammer in use for the bell sound generating system in accordance with the fourth embodiment of the invention in Fig. 14 and 15.
Fig. 17 is a schematic plan view of -the motor driven bell sound generating system in accordance with the fifth embodiment of the invention, taken in line XVII - XVII in Fig. 18, wherein the bell gong is shown in a horizon-tal sectional view.
Fig. 18 is a front view of -the bell sound generating system in Fig. 17, wherein the bell gong is partially shown in a vertical sec-tional view.
Fig. 19 is a schematic plan view of the motor driven bell sound generating sys-tem in accordance with the sixth embodiment of the invention, wherein the bell gong ~o which said system is secured is shown in a horizontal sectional ~rieW~ and Fig. 20 is a perspective view of the bell sound genera-ting system in Fig. 19, wherein the bell yong is removed for the purpose of simplification of illustration.
A typical electrically driven bell which is widely constructed such that a hammer means is elec-tromagnetically driven for the purposc of generating bell sound. TG facili-tate the understanding of the invention this kind of conventional electromagnetically driven bell sound generating systeln will be briefly described with reference to Fig. 1.

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AS illustra-ted in Fi~. 1, a bobbin 2 with a rnagne-tic core 2a inserted therein and a s-tationary con-tact plate 3 ~re securely mounted on the yoke 1, while a vibratory plate 5 having a leaf spring 4 connected thereto at its bottom portion is rotatably supported by means of the vertically extending suppor-t members on the yoke. On the extreme end of said leaf spring 4 is formed a CGntaCt 4a, while on -the top end of said sta-tionary contact plate 3 is formed another contact 3a. Further a lead wire ;s ex-tended from the one end of -the coil 2b on said bobbin 2, while another lead wire 7 is extended from the bo-t-tom portion of said stationary contact plate 3. Further on the top end of said vibratory plate 5 is arranged a hammer 8 secured thereto at the bottom portion thereof, said hammer 8 being extended through an opening on the yoke 1. A coil spring 9 is arranged abou-t the hammer 8, one end of said coil spring 9 being connected to the yoke 1 in the vicinity of said opening. The bell gong 10 is located at the predetermined distance from the extreme end of the hammer 8.
As direct current is applied to the lead wires 6 and 7, it flows through the lead wire 6, the coil 2b, the contact 4 on the leaf spring 4 and the contac-t 3a on the stationary contact plate 3 to the lead wire 7. As the bobbin

2 is energized, attractive force is produced through the magnetic core 2a, whereby the vibratory pla-te 5 is drawn to~ard said magnetic core 2a. Thus the hammer 8 is displaced against the coil spring 9 so as to strike the inner wall of the bell gong 10. A-t the same time the contact 3a is parted away from the other contact ~a, causing the electrical curren-t flow to turn off. The magnetic core 2b becomes demagnetized , 5 -- and thereby the vibratory pla-te 5 is restored to the originGl position by mealls of -the resilient force of -the coil spriny 9.
This ca~ses the both con-tact 3a and 4a -to come in contact ~i-th each other again, resulting in the second elec-trical current flow produced so as to carry out hammering or striking operation against the bell gong to generate the required bell sound.
Then the above described opera-tions are repeated.
It is recognized as a drawback with the above described conventional bell sound generating sys-tem that it is difficult to select and determine the number of hammering or striking opera-tions per unit time as required, because said number of hammering or strikiny operations against the bell gong lO
with the use of the hammer 8 is dependent on a variety of factors such as rigidity of the leaf spring 4, weiyht of the hammer, spriny constant of the coil spriny 9 and others.
Further it is pointed out as another drawback that it is difficult to select and determine the workiny stroke of the hammer 8 as required, because the movable contact 3a is released from the stationary contac-t 4a within the very short period of time. Therefore, as far as the conventional bell sound ycneratiny sys-tem is concerned, it may be concluded that because of the above mentioned drawbacks therewith it is difficult to construct a bell sound yeneratiny system on the commercial basis, which has -the optimum number of hammeriny or strikiny operations and as well as the optimum workiny stroke of hammer means, in spite of the fact that the number of hammering operation and working stroke at which the maximum bell sounding is produced are available only on the experimental basis.

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The motor driven bell sound generat:ing system in accordance with the first embodiment of the invention will now be described with reference to Fig. 2 to 6.
In the drawings the reference numeral 11 denotes a motor, of which ro-tating shaft 12 is provided with a circular disc 13 naving an integral crank rnember 14 located in an eccentric position -therefrom. Said motor 11 is securely fastened to the mounting plate 16 which is formed by bending up a cut portion of the base board 15. In the meantime, r~ 5~Q

;, ~. e ~ r~ r3 (~ e L ~ rl -t i rl g -l late ] 1 at its (1~1C eu{1 wi tl1 1;1le l:id of eyt~let or the lil~e, :,aid r11ourltillg ~)1 lt( l`-j be-in~,r ~`or111ed ~y t~eing up a cu-t por-tion of the ~ase l~(,ard 17, wllere~ -tlle o 1;hér ellcl of said leaf spring 17 is lcept; fri~e In t11e ViCi~lity of said free end of tlle leaf Spl ln~, le i s 1Oc.~t;e~ n1er 20 ~ ich serves to strike agLlills-t tll~i inl-ler wall of the bell gong (no~ shown).
~s showll in the drilwi ~ rS, a coil spring 21 is spanned bet~reen the cranl~ 1llelll1~el l 11 on thc circular disc 13 and the free L0 end of the 1eal sprirlg l~S so that irlterconncction is made tllerebe tweell .
II1 the ellll)odilllell-t iII Fig. 2 anci 3 the cran~ member 14 is for1lled witll an aperture 2 2 into ~hieh the one end of the coil spring '1 is e~;tencle.l, resulting in an engagement 15 f the crallk Inc-~lllber 1l~ -to tlle coil spring 21 provided.
As i1lustrated in Fig. 4 and 5, -the in-tegral crank member 14 may be forme~L in a sllape Or grooved druln, arouIIcl which one e~rld Or the coil spring 21 is hung for an engage1l1en-t there-bet~reen, wherel~y i t is ensured that ro-tational moven1ent ~O of the crank 1nellll)er 11~ is sn1ootllly converted iIltO reciprocative move111eilt 'of th( coil spring ~1.
l`lle n~o~ Lillg ol` tlle L)ell SOUn~l generati11g SYStem in accord~l-lce wiLIl l;lle rir~t ellll~Odil~eLIt Or tl~e invellt:ion is e L~L`ec tecl in SUCil a 111arlller as illustrated iil Fig. 6 . Narrlely, ~_$ the l)aSe I~C).lL`~i 15 i s ri;~;ed to the moullting c`rame 2 3 which is in turn securc d to the l~ell gOl1g 24 at the cen-tral part tl1ereol` so th~lt tile lla1l1111er 20 :is located i11 place agaiIlst the inner wall oL` the ~)el1 gong 24 so as l;o i111part t;he Opti111U111 s tril;i llg 111otioll there to .

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J~5~0 '\l o ~ ' L'. ~ " ~, r (I ~: i. v ~ -, L ~ s o ~ (i C~ e r ~ t illg syste~ a(,~ tl,- 1`irs t elnl~o(lilllellt of -tlle .lnl~ociimcrlt ~i l.,l b(~ dl:scr:ibe(,l below.
.~s tlle rll(~tO:L' ].1 15 s~rit(:l~c(l orl, tlle rOt.~.til1~ sllaE`t 1.
5 is rot~ltcd. ~rhell th(? Cl.'.~ C Illellll~c r ,1!~ on the circular clisc 13 turns about; tl~e rot~(l;iol1 sll,-,lft 12, wllereby the coil sprin~ ~,1 is suL) jccted to r(,ciprocative movemeI1t. Since the other en(I of the co il spL~ g 21 is engagecl to the free end Of the 1eal SI~r~ r 18, s.~i c1 reciproc~ tive movell1ent of l() the coil spril1g 2,L is tr.l1 s1`erred -to tl1e lea1` spr'ing 18 in the forl11 ol` vil~r~tive movel!1ellt;, whicll causes tlle hallllner 20 to be displace(i ~gaillst the inIler wall of the bell gong 24. Thus the re(luired bell souncl is generated.
In tllis cc~r1llectioll it is to be noted tllclt saic1 coil 1 spring 21 cllld ,LeaL` sl~ril1,r 18 are effec tive in absorL ing hamn1ering imp.lc t to so11le eY tent, wllicll is c;lused as the ham11le~ 20 stril~es agaillst tln~ bell gong 24 as well as iIl main-tainillg -the a1`oresaid hall1meriIlg effect ~or the pre-determined perio-1 Or time to ensure the enlarged volume 20 of bell souncl. l~`urtller it is recogI-1ized that -this advan-tageous effec t is lit tle brought meI ely by mealls of the leaf spring l8 ancl tl~a l; the sallle :i s alllpliried by way Or cooperation of'-the leaf s~)ring l8 wi-tl1 the coil spring 21. Addi-tionally, owing to t}lé fact tha,t the resilient f`orce of the coil spring 25 ~l alld the lo;ll` sl~rillg 18 is addecl to the halllll1ering move-nent of the harllll1cer 20 toward the bell gOllg 24, i-t is ensurecl thclt 1;11e wo1kir1g s-trolce ol~ tlle hl1ll1ller 20 is sub-s tantic~lly incre;~se~l.

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.\'o,~-t~ tb(` Ill()~;OL' (I~`:iV( ~I .)( L ~. SOUII(.I ~o~ ating -ystern ill aCC~Ord.lllCe ~,lit~ ;eCOll(.i enlbO(.I:illlCrlt oL` tlle illven-tion ~iL1 be descr:Lbe~ it;ll ret`erellce to ~ig. 7 to 9, In -the ~r-~inf,s til(~ rer.rence nulrlera1 111 denotes a n~otor, oL` wllicll rot.-ltillg sl-lal`t 1l2 is pro~-icled ~ich a circular cl:isc IL3 lli,.`,ill,~, .an :i.ntCglal cranl~ melTIl)er 114 located ~TI arl eccelll;ric pOSitiOll thcrefl-om. Sai~ motor 111 is secured to tlle nlo~lllt:irlg p1ate 116 ~llicll i5 formccl by belldill,g Up .1 Cllt ~OL`t:i.OII Or` I;lle bas( bo~rcl 115. Irl the 10 IllCaIltillle', suppor.~l; lnClllbCI`S 11'1' wh-icll are f`ormed by bendillg up a cut port ion Or thc b,~se board 115 ill the same manner are provided ~ith arl openillg 118 in tlle center thereof respectively, througll whicil a halllrner 119 is supporced clisplaceab1y irl tlle for~ard and baclcward direc-tions. ~s apparellt from the clrrl~ lgs, the llead of the hammer 120 is so dime3lsiolle~l tllrlt it has an ou-ter cliameter larger -than the inner clianlet(r oL s.licl opening 11o so that -the hamrller 120 does by no IlleallS esc.lpe out of the support member 117.
A coil spring 121 is provided, wllicll is corll-lected to the 2~ cranl; nlelllber 114 at one encl thereof and -to tlle tail portion 122 o~` the hall~ er 119 a-t the other end thereof. Tlle en~.lgelllerlt of the crarll{lllelllber 114 to the coil spring 121 is SUC31 -tha-t 1;he 1at~er is 1Oose1y hung on the former, ~llere~y tlle ro-t~tiona1 moverllerl-t of the crank member 114 is .''5 snlootlliy converted.i31to tJle recil~rocative nlovelrlerlt of` tlle coil sprillg 121.
Tlle moulltillg of tlle be11 soun(l gerlercll,iol-l sys-tem in accor~lallce witll tho secollcl e~ ocl:illlellt of tlle inver]tioll is :

: -- ~ O --. ''' 55~ -- el`L`~ct~ ( r ~ L ~ tJ ~ t~?(l ir~ ~ ig. 9 .
~;~-IIIC`ly, t~le l)aS(! boar(l 115 is ~ ed to tlle moullting frame 1~ wllic~l is ill t;UI~II s~cuL~i?(l -to tll~ l~ell gOIl~ lZ~i a-t the cerltral ~ rt tl~ereof. 'I`llus ~be l~a~ (r 120 is loca-ted in place agaillst tll( illllOL' s:ide ~all ol` tlle boL1 gonOr 124 so as to ellsure tllu ol)i;iln~ sLril~i,lg lllo-tiorl by means of said halTuner 1~0.
~ow operatioll Or tlle IIIO~OI dIiverl bell soullcl gellerating systelll in aC(,OL`d.:lllCC W:i.til t~le secol-d elnbocliment of the 1() inverltioll will be dc,~ L il)e~l r~elow.
As the ulotor lll is switclled on, tlle rota-ting sllaft 112 is rotated. Tl-len tlle cral-~{ n~enlL)er 114 OIl the circular clisc 113 turns abollt tlle rotatirlg shart 1]2, whereby the coil sprillg 1'l is subjectecl to reciprocative ~novement.
l~ Since tlle otlleL~ ell(l Or the coil sprinCc,r 121 is connected to the -tail portioll O r tl-le hallllner 119 whicll is e~Ytended throuOIl the opellings llc~ of tlle suppor-t members 117 and suppor-ted tllereby clisplaceat)ly in tl~e forward and bacl~ward directions, the llallllller is reciprocatively displaced toward or away frou- tlle bell gong 1~ so tllat the required bell sound is genelated.
Ill this corl~lectLoll it is -to be rlo1;ed that said coil sprillg 1~1 is errective irl absorbirl~ -the halllmeriIlg ilnpact to some e~tent, ~llicll is caused as tile llalnmer 119 strikes ~5 against tile boLl gOllg 1,_~l as ~ell as ill maillta:ir~ O the above clescribed llalllllleri~ r ef`fuc-t for the predu-terlTIil-ed period of tin~e to CIISUl`C' tlle el~ r~Jed voLull1o Or bell souncl.
- ~`ur-t}ler :it is to L)e aclded t~lat ow:ir;~,r to tlle f.~ct tl-lat -- 11 -- , - ' ~
--tllc~ r~ ) L ` ( ` O ~, L i l l e ~ S ~ r 1. 2 1 :i S a ~ .1 t O t 11 CI
l1al1lil1e~ mOVClllell~ Ol t;l1e l1alll;ler 119 towar(i -tl~e be.11 gong i24, tile wc).rl~iillg strokc ol` tlle l-lallllller 119 ca~l be substantially lengtllerlc?d. To e~ l,)le l;lle ~IL'c~rcs.lid l~ lerin~r effect ancl ~ile worhillg s1,rolcc oL' t,llc ~l.alllrller l]~ co be acljuste(l as required, allo~lc.r coil sl)r:ill~,-ll1ay ~e arrallged abou~ the cylindri&al bocly oL` ~]lC ll~lnlller 119 betweerl the head portion 120 and one of tlle~ suppc)rt merllbers 117.
lNe.~t, tlle Illotor (lriverl bell soulld geneIatirlg system in accordallce ~v-itJl the thir(:l erllbodirllerlt of the invention will be clescribed ~it;il referellce -to l~`ig. 10 to 13.
In tLle ckn,lwillgs -tlle rererence nulnerals 211 deno~es a motor, of ~1l1CII rot,ltirlg shaf`t 212 is pro-vided with a ratchet wlleel 2l3 i.s f`ornlecl with a pluLality of ratches 214 whicll e~tencl 1`rOIIl tlle Cer1ter~ Of rotatioll in the radial direction, so that the rar~cllc!s 21~ conle in interlnittell-t engagement with tlle ben-t portion of` a leaf spring wllich will be described la-te~.
Particularly the sanle nunlber of engL-Igerllell-ts as that o:f said radial ra-tches 214 (three in number in -this :illustrated elnboclillleilt) are el`fected during one rotatiosl of the rotating S11af t 212 to drive the leaf spring. Tlle rnotor 21.1 is sec-lrely fas-tellecl to the molllltirlg plate 216 wllicll is formed by be~ g up a c~lt PO1`tiO11 oL`-tlle base board 215. Said :Leaf spring 21~ is fi.~ecl a-t its one encl to another mounting .'5 pl,lte 217 whicll is f'orlrlecl in the sanle nlallrler as saicl mountillg plate 21~ witll ~lle .l:id oL` eyelc,~t OL' the like, wllile the Otller ellCI of tlle leaL' sprillg ,"1~ i.s kcpt .f`ree. Til:i.s leaf SPring 21~ is as illllst:rLIte~,l in Fi~,r. 12. Tlle leaf spring -- :1.2 --~ .
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(i i 11 ; s t r; I~ ~j f` Le I f sl)r i llg mat~ l i a1 to tl-le l`o~ S illllsl ~al.e~ tlle :Ir ~ , ancl is formed witll lloles ' '0 tllrou,~ icll Cyl~Lec '19 or the like eYte~ lICI (~110 tll(.`l' 1l(.) l.(' ' '? ~ ,r ~ a l~ lrl~ r 5 2'1 is li:;e l tlleret~ ( reas .1~ tl~e fIee e~ of sai(l leaf -prirl,, '1~ is l~l~ovid{~l all ell,~a~ellleIlc portioll 223 wllLcll is formed ~3y beIlding the eYtL~enle end thereof` in the upward direc t;iOIl. This erlg ~ge~ lt por-t ion 223 is loca-ted so as to colne in eng~lgelllerl~ ~ itl~ tlle ratcl~e~ 21~ oI the ratchet lO wlleel 213.
It sllould bc ull~leL s-tood tha-t tlle aforesaid ratchet wheel 213 isIlt t be lilllitecl ollly -to the stIucture as illustrated in tl-le d~ /ings and that the same may be replaced ~ith arlother dri villg wlleel or arrangement which is 15 constructed, for ills taIlce ~ in such a manner that a main gear wll~?el is moullte(l orl t;lre rotation shaft 212 and a pilliOIl is arran~,ed in engagelllell-t Witll ~;aid maiIl geaL wlleel, said pinion being forllled with radially eYtending ratcll ~neans on the outer peri pllery thereof in the same way as the r adial O ratchei 214 on tile ra tcllet wlleel 213. ln tllis modified embodilllen-t it is possible -to ad jus t -the nunlber of bell striking operatiorls pe~r Ullit time by way of adjus-tirl~ the ratio of rotation nlllllbers Or -tlle maiIl gear wlleel and pinion, ins-tead of -tlle speed controller for the motor, which is intencled to ;~5 ~l just tlle nulrlber Or bel L s-tril~ing operatiorIs.
1`he Inoulltin~ of tlle be11 sound generai;ing systern in ac cordiI~ wi t;ll tll~ tl~ rllb(J(Ii ~ ?Il t of tll~? iIIverl til~ll is efreCted ill tlll' Salll(' Illallller as the prece(liIlg elrlbodilllents.

,-s illaiscr;~ted .ill L~ ,. L3, ~ .se 1,oarcl 215 i.s .f`i..~e~l to the moUIltillg plll te 2)!l wllicl~ lS ill tUrrL se~ured to the bell gorlg 225 at tlle ce~ art th~reof. ~ow tlle hllmmer 221 :is reacl~ to stri.lic .l,,r~in~t the ~e:Ll gon~r 225.
(~p~ t:iO~ of:` tLIe 11101;01~ ivell L)e11 souncl generating systelll in accorclallce w-itll tlle thircl elnbodime}lG oL` Ihe inventio;l will ~ clescril)ed below.
~s the nlotor 211 is ~switcllecl o~l, the roGation sllaft 212 is ro~ated cogetllc~ ith tlle ratclle-t ~heel 213 secured tllereto. Then I 1l(? rilcliaL ratcllet 211~ OIl tlle ratchet ~ eel 213 comes in enC~ gerrlent with the u~ arcl bent portioll of tlle leaf spring 218, causing said lear spring 218 to be displaced to tlle l.e.rt as seen in Fig. 11 and 13. When the ratche t 213 is cl:ise~ agecl f:rolll the bent portion 223 as the 1~ motor is f-lrtller rot.lteL, -t]le leaf sp:ring 218 is repulsed to the right clue to -tlle .resilient force tllereof. ~s a result tl-le h.:lnllller 221 secured to the encl portioll of the leaf spring 218 periotllls strilcingr operation against tlle ~ell gong 22~ ter colllpletioll of strikingr opera-tion -the leaf spring 210 is restorecl to -the origina.l pOsitioll so tllat i~ is rea(ly fo.r ne~t operation. ~s the motor continues to be rotated, slrikirlg oL)eratiolls are repeatecL in -the above describe(t III.-IIIICl'.
In this collllectioll it iS to be not;e(i that saict leaf '5 spring, 21~ is efi`ect:i.ve in .~bsorbillg the hallllllerill6r inl~act CO SOII~e e~tellt, whi Cll :iS C.lUSeCI as the hallllller 221 slrikcs agaill.sc tlle belL gollg 225 a:j weLl as ikllrlrli.ncail-lillg, tlle above descri1-ed llalllnleLillg efL`ect for cerl,aill period of`

_ 14 _ ' I~Lr tllC`I` i t lS to l~c o(l(ie(l tl~ L ~ t~(` al`orcsai~ leaf springr 210 m~;es :i~ possil)l( to lengt}lcll tlle wo1-killg str~ e of I ll e h .~
~ t, tllO nlOtOl (lr`l~ ~ n 1~<`11 so~,uld g(rlor.ltillgr system ill aCCOI`dallCe W.i tll tln I`ourtll e IllbOdilllellt Of the i nvention will be,cLoscri~ecl ~ il ro~ rellce to Fig. 14 -to lG. As described abo~e, the nlo~or clriven bell SOllllCI generatillg Systelll ill accot.~cl InC( Witll ti~( respective prece(ling 0 enlbOCIilllelltS COIlS:i.StS :il~ that l-larn~rlerirlg operatiorls are perforllled by W.ly of rociprocative nloverrlell-t of` the halnlller means wllicll is ellergized by a mo to:r. To the contrary the motor driven bell soull(i genera-tirlg system in accordance with the fourth enll)o(lilllellt oL` the invention consis-ts in that bell SOUlld iS grellel lteCI ill such a nlanrler -that rotational rnovement of a motor is converted into turning nlovenlerlt of a llalllrller arm via a recluction gearing so tlla-t a hanlrller Irleans on tile outer end portion of -tlle llalrlmer arm strikes against the protruded portion of`-the bell gong.
In ~lle drc~ in~,r the refererlce nulneral 311 dellotes a notor, of which rotatioll shat`t 312 is provi,decl wi1,h a worm ~rear 3L3 securecl -I;hereto at the e.~-trellle end thereof. On a vertically e~tencl:illg shclft 315 i.s .ar~ -lged a worm wheel 31LI iII ellg.lgelnellt with saicl wornl gear 313 ancl further on .'-'5 the top en(l oL` sai~ shaf'-t 315 is arrarlged an arm 31G wllich.
e~tencls in tllo lloriz,ollt.:ll clirec tion. Sclicl arm 316 is ~ref(?raL)ly Inade of rosiJiellt Wi:L`e nlat;eL~ial sucll as piano wire.
Tllo llL'III 31G is l~Lov:icle~l wi,tlL ~ ICL~ 317 ~cuLe{l to tlle -- .1S

- ~u~er clll,l tl~oLeoL`. I~X illlls~L~t,ecl in Fif,r. 1'~, all conlpol-lencs of -tlle bcll sol,u~l goller.~t;illg sys~e~ re tiglltly mourl-ted to -the support plate ~ icll is in turn is secured to the ~ell gong 320 witll tlle aid ol` a bolt ~ . 0l~ tlle inner ~all of the bell gOIlg 3'~0 is rorllle(l a ~rO trusiou 321 wllich pro~rucles inwards :in t~le rcl(lia,l dilectioll, agLinst wllich the top end of the ~a~ ner 31~ :is locate~i to ilnpart striking effect.
~ ow OpeI.ItiOll Or tl-le motor drivell bell sound generating systelll in accol~ llcc w,ith -tlle rour~h enlboLi:illlerlt o~` the illverltioll will bc dcscl~ibed ~elo-~.
As tlle Ino tOI' is switclled on, tlle rota~ion shaft 312 is rotated togetller witll tlle worm gear 313 secured thereto.
'. The ro-tational movelllellt of tlle worm gear 313 is transferred to the worll- wheel 314, w)lereby the arnl 316 secured to the '`' worm wheel 3,L4 turlls, causillg -tlle llamlller 317 on the e~treme end of the arlll 317 to strike agairlst tlle protrusion 321 on the inl-ler walL of tlle bell g~,ng so as to generate the ;~ requirecl bell soullcl. One rotatiorl of tile worm wheel '~ proc-luces one hamlllerirlg activity.
It will ~e reacli]y understood that by W.ly of adjus-ting the gear reductioll r Lti(> of the WOI`III gear 313 arld worm wheel 314, tlle magnitu(le Or s-trilcing efrect by tlle llcallllller or the heigl-l-t of the protrusioll 321 the qua:Lity and volulne of bell sound:illg carl be e~as:ily controlled.
In the enlbo(lil;lellt .-s illus-trated in F,ig. 14 and 15, resilielLt wire 111.1 terial, is used for the ~lallllller arm 316.
~lternatively tlle il.lllllllOL' aL'III 316 m.Ly be constIuctecl of a coil spring instea~l of tlle solid wire nlcLtelial, as _ J6 -, o illustra~ l`ig. I(~ o i~refer-~d~le, bec;luso a coil SpL`lllg ilils flo~ Lity ll,igilcr t~ -tllal; of a solid wire, resultil]g ill loss ~)ossibilitv Or breah~-Lge Or tlle han~ er arlll cal~se(l duo to nla~,eri.ll f.li,igue as well as in pleasallt be:l,l soundill~,r ~-/Lvd~lc~d.
l`~e,~t, t,he Illoi,or (Ir,ivo~l l)eLl sourld gen~rati,rlg system in accor,dallce wi.tll ~llo l`l~`tll elnboclimerlt of ~lle inventior will be describccl Wit~l ref~rellce to I~ig. 17 and lS.
In tlle (lrawLIlgs l,lle ref`orence numeral 4il deno~es a motor, of wl-licll rOi,.ll;iOI~ Sh<~rt 412 is provided with a worm gear 413 secured ~lereto at the e.~rellle encl thereof. On the ver-tical,ly e.~-tenclil~g s}laft Lil5 is arrange{l a worm wheel 414 iIl engagelllellt wi,tll said WOLIll gear ~il3. Said worm wheel 41L~ is proviclo(:l w,itll a clriving pin 416 on the upper surface thereof, said drivillg pi,n L~l~ boillg i,ocatecl in eccentricity frolll the~ ro-tatioll sliaft Ll15 ol' tl-le worlll wlleel 414. ~s apparent fronl the dr.lwillgs, tlle driving pin 416 is in el-lgagelllellt with tho hool; pO:rtiOIl 4,L9 of a swing arm ~17 within the slit 423 e.~tending -through said hoo~ portion 419, saicL swillg arm l~l7 being suppor-tod in a swingillg nlanner ai~out -tl-le ver-~ical shaft ~17 located substantially in tho center of the boll gOIlg 421. On the bo-th ends of the arm ITIelnber ~lc ill tlle rOrnl O.r t~in arm aro provicled hallllllers 420 securecl l,]lereto~ while on tllo inner wall of 2S the bell gong 4'-'1 are provided l~ro-trusioils 422 ~hicll e~-tend inwards i.n tlle racl:ial diroct:ioll~ s.lid protrus:i.ons ~i22 bo:ing loca~ocl at -tlle l~re(letoJ:~ illod d:istanco rronl tlle llal~lers 420, Now oporation of tllo nlOtor drivell ~e.ll soullcl gerleratirlg . .

- svste~ ccoldallcc ~ i tll t 11l: I`il`tl-l lnlbodilllent of t~ile inventiOn wi,LL bc dcscril~c(.i l)elow, As the IllOl~OI` ~ i.s sWit:.CIleCI Oll, the I`OtatiOrl sllaft 412 is ro Ga~(~(l toge tller wi. t;ll the worril gear 1~13 seeured to 5 -the end E)ortiOI~ tllereol`. Tlle rotatiollL1 In~ elllent of the ~;orm ge.l.r L113 :i s tr(nlsreI~:red co the worlll wlleel 1ll4, causing tlle sa~ne to be ro ta ~ecl . 'l`llu s the driving pin 416 on the worm wlleel 4lL~ is clisplilcecl ..long tlle eireu1ar tr.lclc7 of wlliell radius is e(~ l to tlle eecentricity frolll the rotatio shaf t 415 . ~s t;he (.Ir.i ving pill L~16 perl'orllls c:ircular move-mellt , tlle arm nlelllber ~ i s sub jec ted to swingillg rnovelllent about the suppo.rt sh.~f`-t ll17 via the hool~ portion 419, whereby tlle hamlllers 420 0ll the botll encls of the arm member 418 strike ag.liIIs t tlle E)ro trusiolls 422 o.t` -the bel.l gong 421.
rllus tlle requi.recl bell SOUlld is proclueecl.
It will be rea(lily unders tood that by way of ad justing tlle gear rccluetioll raLio Or -tlle worln gear and worrll wlleel as well as tlle eceelltri.ei ty of the drivillg pin the quality and volume of bell souncliIIg ec~n be e~sily eontrollecl.
2`0 Finally, tlle nlotor drivell bell sound generating system iIl accordance w itll tlle si.Y tll embodilllerlt of the invention will be described wi tl~ rel`erellce -to Fi~,r. 19 allcl 20.
In the drawillg,s the referellee nullleral 511 deno tes a nlotor, of wllicll rotation shaf`t 512 is provicled with a worm gear 513 secure(l tllereto at the e~{tren~e end por-tion therec)f.
0n the ver-tieally e.~tending shat`-t 515 clisposed on the base board (not sllowll) is rc)t.ltab.Ly .arrail~,e(:l a worlll wlleel 51Li in engagrerllellt wi tll sa:id WOI`IIl gear 5:13.

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. ~ .

-()11 tlu~ )(?.1` 51.1:1` ''~1(,~` o ~ 1(? WO:rlll Wlleel 514 is provided a VCrt:iC.llly ~ t(?lldll~g eng~lgcllle~lt; pin 516 located in eCC1311t``iCity frOIII tlle` L'Otat:iOil sl-~a~'t tllereor, saicl engaging pin CO~ g in enga~.rclllcnt wi.t;ll the lever merllb(3r 519 within the lollgl~r slil 5'~ tll~3.L~?o.f, wll:ich is adcpt~cl to swillg abou~ the supl~orl; ~ha.L't 51~ vcrtic.Llly disposed in the vicinity~ of tllc bcll goll~,r 5'7. On t~le opposite side to said longer slit 520 :is provided a vertically e~tending driving pin 52,~ icll C0111C5 in engagenlc3nt wi-th -the lever 10 mc?lllber 519 witll,ill the shor-tc.[ sli-t 521 thereof, said driving pin 523 being fi~ccl to the llallullerillg rod 522 e,~ac-tly at the center theleo.r, Tlle hall~llering rod 522 is reciprocatively displaceable in the both directions~ being supportecl by the support ; 15 plates 524 on the b~lse board (not shown), On the both ends of tlle llal~ (3lillg rod 522 are arr.lnge{lllanlmers 526 secured thereto via co:il springs 525. The lengtil of the hamlller 52~3 i~ dilllensioned so that the harlllTIer 526 is loca~ed at the optilnulll distance fronl the inner wall of the bell 20 gong 526.
~ow operation of the 1110 tor driven bell sound generating ~ystcnl in accordarlce ~ith the si~th embodilllellt of the invelltion ~il.l be describ(3d below.
~ the nloi;or 511 is switclled on, the rotation sllaft 25 512 is rota-tecl togcl.llcr wi-th tile worm gear 513 secured thereto at the e.~trelll(3 ellcl thereo.f. Th(3 rota-tion of -the ~;ornl gear 513 is trallsrerrec~ to til(3 worm ~Il(3el 51l~, causing said ~orm ~ c~?l 5:L4 to be~ rotate(,l, wllerel~y the engagelTIent .

5~
~>ilL 5l() ~i('L`~ n:. (`.i.~'('l,ll,lL' 1110~ , alor~g t,l~e ~re~le1,errrlirlecl track oL Jl~lcll rldills is e(lu.ll to ~;lle eCCerl~riCity thereof from the su~-port sl~aLI; 515. ,~s t;l~( enf~a,~ell~cnt pin 51G
turns, tllr? levcr Irle~ )eL 5l~ s~villt,s a~out the supporl shaft 517, w}lel-el~ t,llc ~Irivil-l,, pin ,~'-'3 is reciproc.lti-vc?ly clisplaced, WlliCh COIneS .Ln Cll,',a~.;('lllC`~It ~'itl~:ill thl:` sllOrter slit 521 of said 1ev,er nlelllL)el 5l~,) Tl~us tlle h.~lllnerillg rod 522 is operate~l by IIIC?<~IIS of ~he drivillg pin 523 so -t]ha~ the hamlners 5~6 stril;e aglir~st t,l~ ner ~al] ol t~lC? bell gOllg 527, ~s ~,~?- a result tl~e re~luirc~l bell sourld is g,erleratecl.

I~ ~ill bc rcacli1y understood that by acdjus-ting -the gear recluction r-l;io of -the ~orm gear and ~vorm wheel as we11 as tlle eccelltricity of -the both pins the quality and vo1ume of bell soul-lcling carl be colltrolled in the same manner as tlle prece~ing elllbodilllellts ~ s clescribecl a~ove, tlile nlotor drivell bell sound generating system in accord~llce ~ith tlle presellt inverltion has an a~vantageous le.lture ~llat it is simple in structure and acljustable in generatillg -tlhe required bell sound ~loreover it has the fol10~illg adclitiolla1 fcatures ~ a) It is possib1e to ad~just tlle nunlber of hamlnering operatiolls per,unit tinle c.ausecl by striking activities of t~le ha~ ner, as recluirccl, by ~ay oi acljusting the nulllber of rotatioll of tlle nloi;or~ the gear recluction ratio of tlle 1110 tor ~5 or tlle eccentricit~ oL` the driving pin an-l/or engagement pirl so that tlle nl~ er of`llallllrlering opercltiorls is ensured for tlle Illa,';:illll,llll vol,l~ c ol` bel..L soulldirl~,r.
(b) I-t is l)ossible to ellsuIe tlle optilnullll)eriocl of tirne i . .

L~ cil)~ ~fr.~ lst tll~ b~.LL ~orlg by wa) Ul` selec~;iv~ etcr~ ing tll~ spring constanc of the coil aprlng ~ d/()l' IC~Il' sl~riJlg, (c) It; :is possil~ r to lellfl;llerl -tlle worlcing stroke of' S llamlllerillg O~e-~e;lt:i.oll by \~ay u~ a.ru-anf,irlt a leaf sprillf~ and/or coil sp.l'illt,'. ~IOI'(`OVC:L' it ia possi~1e to subs-tarltia11y 1engthell.tlle wollc:irlg l.ife of tile beil sound generating system o~ing to -t~le facl that the e~cessive ha~nJnering force inlparted agaillst tlle IJel:l. gorlt- l)y tlle halnrrler can bc a~sorbed by -tlle dulllpillfr l'l.~nct~oll of the spring n~earls.
(cl) I-t is possible to operate tlle be11 sound gerlerating system in less e1ectrica.L po~er sulnption -tllan the conventional e1ectromagrletic ~riverl bel1 souncl genera-ting system.
Tllc nlotoL~ iverl bell soui~d generating system has been clescribe(l w.itll respect to tlle six prel'erred errlbodimerlts ol tlle preseilt inve~ltioll, as described above, It shou1d be ~f course understoo(l t,~ t the presen-t invelltion isn~t 1imited on1y to tllese prererrccl enlbo-l:irrlellts but i t may be modified or cllallged ~ithout any depar~uIe rrolrl t~le s~irit of the illV(~lltiOII.

Claims (6)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A motor driven bell sound generating system comprising a motor, a worm gear secured to said motor, a worm wheel in engagement with said worm gear, a hammer arm secured to the rotation shaft of said worm wheel at the end portion thereof, extending radially at a right angle to said rotating shaft and a hammer means secured to said hammer arm at the outer end thereof.

2. A motor driven bell sound generating system as set forth in claim 1, wherein said hammer arm comprises a resilient wire material such as piano wire.

3. A motor driven bell sound generating system as set forth in claim 1, wherein said hammer arm comprises a coil spring.

4. A motor driven bell sound generating system comprising a motor, a worm gear secured to the rotation shaft of said motor, a worm wheel in engagement with said worm gear, said worm wheel being provided with a driving pin securely disposed at the predetermined radial distance from the rotation shaft of the worm wheel, an arm member in the form of twin arm having hammer means integrally provided at the both ends thereof, arranged rotatably about the rotation axle located substantially at the center of the bell gong, said arm member being integrally provided with a hook member extending at a right angle thereto, which is formed with an elongated slit within which said driving pin is located for engagement therewith.

5. A motor driven bell sound generating system comprising a motor, a worm gear secured to the rotation shaft of said motor, a worm wheel in engagement with said worm wheel, said worm wheel being provided with an engagement pin securely disposed at the predetermined radial distance from the rotation shaft of the worm wheel, a lever means having outwardly extending elongated slits at the both sides thereof, arranged rotatably about the rotation axle located substantially at the center of the bell gong, said engagement pin coming in engagement with said lever means within longer one of said elongated slits, a hammering rod reciprocatively supported by means of support members on the base board, extending substantially across the center of the bell gong at a right angle to said lever means, said hammering rod being provided with a driving pin securely disposed at the middle thereof, said driving pin coming in engagement with said lever means within shorter one of said elongated slits, and hammer means connected to said hammering rod at the both ends thereof via a coil spring.

6. A motor driven bell sound generating system as set forth in claim 1, 4 or 5, wherein the bell sound generating system is securely mounted to the base board which is turn secured to the bell gong via a mounting frame means.