US929744A - Motor. - Google Patents

Description

E. E. YAXLEY.

MOTOR.

APPLICATION FILED DEL-28,1908.

929,744. Patented Aug. 3, 1909.

WITNESSES: INVBNIUR UN]. T1411) il illll lN T Fl? l (2E.

MOTOR.

Specification of Letters Patent.

Patented Aug 3 1909 Application filed December 28. 1908. Serial No. 469,540.

To all whom it may concern.

llc it known that l', lCnNlcs'r l YAXL'EY, a citizen of tho Unilcd Status, rcsiding at (.hicago, in the county of Cook and State of lllinois, have invented a certain new and useful Improvomcnt in Motors, of which-tho following is a full, clear, concise, andcxact descriptron, reference being had to the accompany mg drawings, forming a part of this spcclfica tion.

invention relates to motors and particularly to that class o'imotors finding scrwiice in the operation of clocks, though I do not wish to be imitcd to the use to which the device of my invention is put.

Itis'onc of the objects of my invention to provide riicans for stopping tho operation of the whce train of the motor, whiolrmoans also preferably acts to start the trainwhen it .is desired to have thcstopping action-0fsaid means removed. a braking device which is prelcrably'accessL' ble from the exterior of the motor, which braking (lfiVlCG. is preferably cooperatively related to the balance wheel of the motor in umanncr' to engage said balance wheel when the'm'otor is to be stoppxed and to actuate the lbalan'c e whoelyahen t 0 motor is to be F0, leased, therebyhto start the motor, the brak in mechanism. thus having added to the H]. litional "function of a starter;

"* The portion or sieiyicc in connectionwith the mo- .tors cm loycd for operating master clocks, thou h y do not wish tobo hmitod to the use to w ich my invention is put; When used in connection "with master clocks, it enables the clock vadjustcr t6 stop the master clock quickly and to startit quicl il for the purposo of bringing the. master 0 00k into synchronis n with standaif'l timc, and Whcrcby tho. secondary clocks may bopormitted to Within in synchronism' with thomast-or clocks.- "By wayofcxam filo, let it be as sumc'd that the master oloc affects an opera tion of the motor deviccsjof the secondary clocks once a. minute," and let it be further as- .sumed that the master clock-is a half minute fast (for example)" with respect to standard time -'l.ho motor mechanism of thc'mastcr clock may be stopped by means ofthc brain ing device just'a half minute, -immcdlately whereupon the braking device r'nayho .0 ran otcd to release. the motorol' the master clock v I y The means comprises 'tion.

present feature of my invention is of i for maintaining the contacts that govern the' energizing circuit clean and bright. This latter feature of my invention finds its prcferred adaptation to the motor mcchani'sn'i covercd in my o-pending application ior United Statrs Letters .Patcnt Serial No: 424,760, filed April-2, 1908, though} do not limit myself to the. adapts ion of my present invention to the motor ofgaid application.

I will explain my invention more fully by reference to the accompanying drawing,

showing several embodiments thereof, in

Which-'- e Figure 1 is a reari'view of a clock motor constructed. inaocoi 'dance .with my invbn- Fig. '2 is an enlargement of a part of the mechanism illustrated in Fig. 1. Fig. 3 isanenlargement of an art of the mechanism illustrated inFig. 1. Fig- 1 is a sectional View on line 4'4 of Fig. 3. Like parts are indicated by similar charactors of referent-.1; throughout the different fig ures. .i

The motor mechanism illustrated comes, as has boon stated, within tho scope of claims in my aforesaid ap .lication for United Sta-too lit:

Letters Patent berial No. 424,76Q, ffi-ltd April 2, 1908, such motor mechanisml boifi'g sclnctcd for purpose oi illustration the plcscnt application as onc to whiclrlnyes cnt invention inits dilflirentaspects int-caddy j adaitcd. This motormechanism includcsil cloctrain a in suitable .rclation with hands of the clock, all as is well uhdsrstomt by those skilled in the art.

Theiniti'alw I b of the train ais in tho form ota rat" wheel, to which torque. is initially apt-lit for the purpose of opcral-ing the balance the train'iii suitable g'car relation wheel I). Torque is applied. to tiibfiWlldOl" by means of an actuatingp ryvljcavl hiolrfi' in turn, opcratcd by a sprn'ig 11a 1 pawl 0 is pivoted upo'n'nn arl'naturc c ingro n cli'cctiv'ely exert-0d upon tho paw spring (I, it heiny understood that this powvr is ell'i tively exert-ml during the time that the IllugIHAh/lH in upon viii-nit. When Ilw armature has cuiilph'tr l ii.-: mn'lnnl roan-iling fllUVl l'llo-lil, l'r in if oll'rtrd HHIWHL, tho circuit including thirhrlro mogul-l nnd it suitable source of ('nrrrnt, illllll lmttvry he closed between the rontnir-ls /l :ind 2', 11%. will he presently ,ihwicrihml, A'horwhy lln: trnxiun of the spring d is inoroniwil for tho pnrpmw oi renewing the power that is required to own nte the motor. During tho nttriwi-ion ol' the ltllllfltlllo this rircuit is nminlminod ('lnsmi. To niwomplieh this result in the on'ihmlin rml of the invention slNJ'WIl, l cnuhlithe hold-lug; pi wl or detent I: (which it: inizludvd in circuit with the battery g in serial relation in ith tho contact i) to out upon the contact 11 in such n manner that when the actuating; pawl 0 him moved the wheel 1;- itairodetcrininod orczz-l' distance, preferably one tooth, the holding pawl will drop int-o engagement with a fresh tooth and permit the contact i to engage the Contact h.

In order to open the eireuit, the contact '11 is lifted,.whioh liftingo )ero-tion takes place when. the airmatu re e has lioen lull y nitrnoted, it being understood. that when the arrow-tore is fully attracted, the actuating pawl c has engaged a fresh tooth, the pmrl, when dro )n ping into engagement with a fresh tooth,

permittingon agency toellecl the elevation of the contact h, which. u gency is dosh-"ably the some spring J.' T he Contact his provided upon an arm h which is mounted to swing or rot-rite about uoenter illustrated at k up'on a'bracket that. affords asnpport for said arm h. The contact 71 is curried upon a.

bracket extension of. the pawl/r located beneath the contract 72., and is desirably in the form of a screw, thus limiting the contact 2'- adjustoble with respect to'thecontiwt h, the contacts h and 11 both being preferably rigid.

-The arm h} and the mwl c are artirr-uh'tted together, the pawl 0 min provided with a cam in (2 while the contigumis end of the arm is provided with :1. slot lwhich has its lowermost oblique surface parallel with the surface of. the tooth 1), over which the'pnwl c.- is adopted .to ride when -mid pawl ismovod by the armature in ro-winding tho motor. The lower zu't ol'the uppermost surface of the com sot Z has in. similar direction, but the upper portion of the upper surl'uoc oi the cum slot I is swung toward the saidtootlrsurlnee over which the pawl c ridm: when living; moveil'hy the armature ol' the,oli-vtro-mugnot, so that when the pin-1 is in line with the upper portion of the mun slot Z, the nrin'h is permitted to deseeml slightly so as to cause it partial approaclrof the contact It toward the contact 2 before the detent or holding pawl 1c dro 5 into. engagement with it,

fresh tooth. hen the ar'lnaturehas lust.

illZUllh i' -urhcll its fully row-dud position, in whirl] IIIUWHHIIL the heel (i hns lwon rotnti-d toward llH' nrnnll nro hy lho um-l (r, thillllillll |'n.wl K' drops inlo ongngi'nivnt with n ll'lJ-ll tool-h, llll' onlm't i then u vprorwhing nnd i-ngnginy (.Incontnrt Ii, \i'hir I (:ontnrt It hml hitherto iipproinrlwd the contort i, no hits: lwon started, the contact i in its movement roan-hing tho contort It to (lUh'P circuit through tlnlinilnly g7, Whvroupon tho nnzpj nutf i: vnor gizml to nttrnct its nrnmluro r to replenish pom-r in the spring (I.

'Ihoholding puiwl 7c is dosirnhly in the form of n boll-iamnk lover pivoted at m nndhoving connection with :1 spring n which servos to hold the pawl k in cnmgcmcnt with. the ratchet \\ll(-(.'l I). It will. )0 observed that the surface of the eontuct h engaged by tho con' face of the contact 1' that is nduptedfor enitlincniont with thepi'vot'm ofv the pawl It, so thot when the pawl drops into fresh tooth engngomcmt, the, Contact 1', is'moved'over the en oged' mirfnee of the Contact h, therebyru hing said surface so Fl-S to n'mintoin tho engn cd surfoecsof the contacts h and iconstnn t ly bri ht and cleoii. The initial engagement o? the contact with the contact h is effected when the pawl k hos dropped port the time that the. pawl drops the balance of the way into engagement with the tooth. This result, in the embodimenhofthe invention illustrated is obtained 1)" rei son of the have of the contact tend. pivot m is itn ular with. reepect to the line including the ru bed surface of the contact h and pivoth'. The result is furtherprom'oted by l'nivin the centers m and It nonco-in'cident. 1e initial engagement of the contact 'i with the contact 71 occurs during the e ogement of the pin. a with the upper end '0 the cum slot 1. The enlargement of the upper end of the com slot 1 permits the Spring n acting through the contact t and thecontact- 0st h, to hlt th nrm It, the rubbing vit'ction 'e't'wccn the coiltzwts moot of the arm It'is thus important in the precise construction. that 1 lmvo illustrated Ito enlorgo the up or end of the com slot 3, for if the up er sol occ of said cum-slot were kept mro-lle with the lower surf ace of said com S ot throughout, and therefore no ollel'with the surface of the tooth over w rich. the pawl c rides, the contact It would hot be lowered toward the contact i and the lprin'g 7t would not be adapted to effect ru ibing it, which ru'bbin movement accompanies the lifting action 0 the contact 1 upon thocontori-.1. in other words, the poet h s dropped fact that the luie. including t 1e. rubbed sur-- :.;ovemcnt of the oonteQt-i over the rontnct toot i, is in substantial'horizontul nlinemont with the pivot h oi the arm h and that sur-' giigeinont with the contact h is in oblique way and the rubbing actionfoccurs during by reason of the deflection in the up or obli ue wall of the cam slot 1, a distancet rou h which it may afterward be raised by the li t-- ing action of the contact 'i, for if the post it did not drop and afterward were permitted to rise by reason of the enlargement at the upper end of the cam slot Z, the only function which thespring n would exercise would -'be to bring the contact i solidly against the 10' contact it without lifting the contact h, for were the enlargement at the upper end of thecam slot 1 that had permitted the descent of the contact h, absent, said contact it could not be elevated, because the in c would not, without said enlargement o the cam slotl, have had opportunity to leave the lower ob lique surface of the cam slot 1, which lower oblique surface serves to limit the upward movement of the arm h carrying the conta cu h; In other words, lost motion is provided between the pin 0 and the 11 per end of the'cam slot 1 which permits 0 the dcscent of the arm and contact h, and, consequently, permits said arm h and contact h to rise bcfore the pin 0 is rigidly enga ed by the lower oblique wall of the cam s 0t.- The undefiected portiohof the upper wall of the cam slot 1 serves, in coeperatlon withthe pin a, to move the contact/h awa from the contact '5 after the cnergization o' the magnetf, to open the circuit'of said magnet, and, thereby permit the spring I to operate themotor. p In order that the motor may be sto ped, I. desirably provide the braking ,mecl ianism' illustrated, which includes a centrally piv-- oted braking levero carrying a brake shoe whose arc of travel'interceptsthe periphery of the balance wheel q, the operating rod r, hanging'from. thelever o,extending to the exterior of the motor mechanism,'whereit terminates in a handle 8, by grasping which the rod r may'bcnioved'upordowu to swing the brake shoe into or out of engagement" with the balance wheel, .t'hebraking en agement of the brake shoe with the balance wheel being indicated in ottcd'lines in Fig; "1 and in full lines in Fi 's., 3 and 4, the idle position of the; brake sioe being indicated in full lines in Fig, 1. After the motor has been stopped a 'sufhcientlcngth of time, it' is moved from the position shown in'the dotted lines inFig. 1 to the ,ositiou shown in full lines. Inasmuch as I ave shown the brake in cooperative. relation with the balance wheel and occup ing the position it does with relation 'to. the alaz'icei-Wheel, the upward move nent of the brake shoe, in being released from the brake wheel, will impart a turning movement to the balance wheel, which is set into 'onerallion as" soon as the brake shoe leaves tlieibalancc wheel,

I have tested the device constructed asl illustrated in the drawing, and by operating the motor at a high rate of speed, have obtainable, as has the precise caused contact to be made and broken ath and 2'. over ten million times without an at'-- t-cntion tothe contactsh'and i, thus in icatthat a clock would operate, with a su1tlIl ab le source of current at g, upward of twenty cars. This test is still being continued, and inasmuch as the contacts h and i have not been impaired by burning,- corrodin or in any other discernible way, it woul seem that the motor of my invention would 156.75 capable of operation fora much greater period of time,'which Treat length of service is een indicated, without any cleaning of the contacts'h and i'other than that occasioned by the-rubbing action of the contacts.

It will be observed that the brake when applied to thebalan'ce wheel, rotates the balance wheel, thereby romoting the starting tendency of the ba ance wheel when the brakev is released. r e

While I haveherein shown and particularly described the preferred embodiment of my invention, I do not wish to be limited to arrangement illustrated, as chan es may readily be made. without departing from the spirit of the invention."

Having thus described my invention, I claim as new'and desire to secure by Letters Patent the following:-

-1. Apparatus of the class described including an'electro-m net, apower'de'vicc in I which energy is storer. by the el'ectro-magnet when energized, mechanism. operable by said power device to enable the transmission 10-0 of' power therefrom to-.perf0rm work, a

rate let-wheel formin lpart, of the load operatedbythc power 1 pkawl adapted to engage the ratchet wheel to old the sanie .to enable the electro-magnetto evice, a holding,

replenish. power said power device without disturbing the load, and switching mechanlsm for c osing circuit through sald'electromagnet when said pawl has fresh'tooth engagement, said switching mechanism includ- 1 mg one contact .carried' by said pawl and a second contact mounted to rotate or swing about another point, the 'lineincludlng the point about which the pawl may swiu and the contact carried b the pawl intorso it" my; the line including t 'e companion cont ct -and,the point about whiclrit' swings, the

point about which one of thocontacts swings or rotates being suflicie'ntly nearer the con tacts than the point. about which the companion contact swins or rotates, so as' to occasion material in hing action between the contacts to kee said contacts'clean.

2. A'pparatus o the class described including an electro-xna net, a power device in which energy is storm by theelectro-magnet when, energized mechanism operableby said power device to enable the transmissionof power therefrom to perform work, a ratchet wheel forming part of-tho load operated by" 1,30-

the power device, a holding aw] adapted to engage the ratchet wheel to old the same to enable the elector-magnet to re lcnish cwer in said power device without 1sturbmg the load, and switchin mechanism for closing c rcuit through sai electro-magnet when said pawl 1' LB fresh tooth engagement, said switching mechanism including one contact carried by said pawl and a second contact mounted to rotate or swin about another point, the point about whic I. one of the contactsswings or rotates being sulficiimtly nearer the contacts than. the point about which the companion contact swings or r0 tates, so as to'occasion mate-I iad rubbing action between the contacts to keep said contacts clean;

3. Apparatus of the class described including'an electro-ma net, a power device. in which energy is store by the clectrom'iagnot when energized, mechanism operable by said power device to enable the transmissioniof about a point non-co-incidant-with the point about w rich the pawl is adapted to swing, the mechanism by which the power device may operate said load including an pperating pawl actuated by the power device and engaging said Ipatohct wheel, said pawl having cam engagement with the member carrying the contact that is companion to the contact carried by the first aforesaid pawl,

serving to open the circiiit of the electromagnet after said contacts havobeen engaged and per-nutmeg the contact-support- 111,? member that is in cam cngagement'with' said pawl to partially approach the contact carried by the first aforesaid pawL'Whereby the first aforesaid pawl is adapted to cause the contact it controls to lift and rub over the companion contact when circuit is closed through said electro-ma met.

4. Apparatus of the c ass described includin: an electro-niagnet, a power device in which energy is stored by the electrom agnet when energized, mechanism operable by said power device to enable the transmission of power therefrom to perform work, a ratchet 'wheel forming part of the loe'il'operated by the-power device, a holding pawl adapted to enga lge the ratchet wheel to mid the same'to enab e the electro-nmgnet to replcmsh power in-saidpower device, and swltc iing neehanism for/closing circuit through said elcctro magnet when said pawl has fresh tooth ongagement, said ewit'chi mechanism including one contact carried y said pawl ands second contact mounted to rotate or swing about a point non co-in'cident with the point about w Hi the: pawl is adapted, to swing, the line including'the oint about, which the pawl may swing and t no contact carried by the pawl intersecting the line includin the com Janion. contact and the oint a cut whic it swings, the mechanism ywhich the power device may 0 rate said loadinclud= mg on operating paw actuated by the ower device and engaging said ratchet whee said awl having cam engagcmenbwith the mom N el carrying the contact that is companion to the contactcarried by the first aforesaid pawl, serving to open the circuit of the electro-magnet after said contacts havebeen ongaged and permitting the contact-supportin member that is in cam engagement with sai pawl to partially approach the contact'car-v ricd by t e first aforesaid pawl, whereby the first aforesaid pawl is adapted to cause the contact it controls to lift and rub over the companion contact when circuit is closed through said electrmmagnat 5. Apparatus of the class describedincludins: anelectro nagnet, a power device in which energy is stored by the electro-magnet when energized, mechanism operable by said power device to enable the transmissionof power therefrom to perform work, a ratchet wheel forming part of the load operated by the power device,,a holding lpawl adapted to c'iga e the ratchet wheel to mid the same to enab e the electro-magnet to re lenish power in said power device without (listurbingthe load, and switch-in mechanism for closing circuit through sa d electro-magnet when said awl has fresh tooth engagement, said switc ling mechanism including onecontact carried by 'said pawl and a second contact mounted torotate or swin about another point, the line including tie. point about which the pawl ma swing and the contact carried b the paw intersecting the line including t m companion contact and the point about which it swings, the mechanism by which the power device mayoperatesaid load including an operating pawl-actuated by V the power device and engaging said-ratchet wheel, said pawl having earn engagement with the member'carrying the contact that is companion to the contact carried by the first aforesaid pawl, serving to, o n the circui of the electro-magnet after said contacts'have been engaged and permitting the contact supportin 'member that is in cam engagement wit said pawl to partially approach the contact carried by the ,first aforesaid pawl, whereby the first aforesaid pawl is adapted to cause th'ocontact it controls to lift and rub over the companion contact when circuit is closed through said electroa magnet.

6. Apparatus of il l( c lass described including an clectro-mugnct, a power device in which energy is stored by the electrounagnot when energized, l'nechanism o perableby said power device to enable the transmission of power therefrom to perform work, a ratchet wheel forming part of the load operated by the power device, a holding pawl adapted to engage the ratchet wheel to hold the same to enable the elcctro-magnet to replenish ower in said power device without disturbing the load, and switching mechanism for closing circuit through said olectro-niagnet when said awl has fresh tooth engagement, said switc ing mechanism including one contact carried by said pawl and a second contact mounted to rotate or swing about another oint, the line including the oint about w ich the pawl ma swing {Hit the contact carried by the paw intersecting the line including the companion contact and the point about which it swings, the point about which one of the contacts swings or rotates being nearer the contacts than the point about which the companion contact swings or rotates, the mechanism 1) which the power device may operate said lead including, anoperating pawl actuated by'the power device and engaging said ratchet wheel, said pawl having cam engagement with the member carrying the contact that is companion to the contact carried by the first aforesaid pawl, serving to 0 "ran the circuit of the electro-magnet after said contactsh ave been engaged and pwrmitting the contact supporting member that IS in cam engage- ,ment with said pawl to partially a preach the contact carried by the first a oresaid pawl, whereby the first aforesaid pawl is adapted tp cause the contact it controls to lift and rub over; the companion contac't when circuit is closed through said electromagnet.

7-. Apparatus of the class described includin an electro-magn'ct, a power device in w' ich energy is storectby'the clectromagnet when energized, mechanism operable by said power device to enable the transmission of power therefrom to perform work, a ratchet wheel forming part of the load operated by the power device, a holding pawl adapted to engage. the ratchet wheel to hold the same to enable the elcctro-magnet to re lenish power in said power device without disturbing the load/and switching mechanism for closing circuit through said electro-magnotoperate said load including an operating pawl actuated b the power device and engaging said rate et wheel, said awl having cam engagement with the mom or carrying the contact that is companion to the contact carried by the first aforesaid awl, serving perl'nltting the contact-supporting member that is in cam engagement with said awl to partially approach the contact 'carrie by the Just aforesaid aw], whereby the first aforesaid pawl is 8.( apted. to cause the contact it contact when circuit is closed tln'oug said electro-magnet. i I

8. Apparatus of the'olass described including an electro-ma 'net, a power device in which energy is storm by the electro-lnagnet when energized, mechanism operable by said power device to enable the transmission 'of power therefrom to perform work, a ratchet wheel forming part of the load operated by the power device, a holding'pawl adapted to eng a e the ratchet wheel to hold the same to enable the electro-magnet to replenish power in said. power device, switching mechanism for closing circuit through said electro-magone contact carried by said pawl and a secondgcontact 'mounted to rotate or swing about a ointnon-co-incidcnt with the point about w rich the pawl is adapted to swing, the mechanism by whichthe power device may operate said load including an operating pawl actuated by the power device and engaging said ratchet wheel, said awl having earn engagement with the mom or carrying the contact that is companion to the contact carried by the first aforesaid pawl,,serving to open the circuit of the electro-ma net after said contacts have been engaged, t ere being lost motion between the pawl that is employed to transmit power from the power device andthe contact-sup orting member in cam engagement therewith to permit the contact carried by the first aforesaid pa'wl to rise and rub over thec'om anion contact.

9. Apparatus of the c ass described inwhich energy is stored by the elcetro-magnet .mg one contact carried Saidpiriygl, i second contact mounted: it rotatef controls to lift and rub over the com anion' eluding an electro-magnet, a power device wheel forming part of the load operatedby gugenient, said switchingimechanism'imdpd to open the circuit of the eectro-magnet after said coi'itacts have been engaged and not when said pawl has fresh tooth engage- 'ment, said swltching mechanism including when energized,'mec anisrn operable by said i .pawl, serving to open the circuit of the electi e-magnet after said contaijts havebeen engaged, there being lost mt ion between the awl that is em loyed to transmit power mm the power cvlce and the contact-supporting memhmzin cam engagement there withto permit the contact carried by the first aforesaid pawl to rise and rub overthc companion contact.

10. Apparatus of the class described including an electro-magnet, a power device in which energy is stored by the electro-rnagnct when energized, mechanism operable by said power device to enable the transmission of power therefrom to perform work, a ratchet wheel forming part of the load operated by the power device, a holding and adapted to 'enga ethe ratchet wheel to wold the same to enab e the electro-magnet to re lenish power in said power device without disturbing the load, and switching mechanism for closing circuit throu h said electro-magnet when said pawl has fresli tooth engagement, said switchmg mechanism including one contact carried by said pawl and a second contact mounted to rotate or swing about another oint, the lineincluding the oint about which the pawl may swing and tie contact carried by the pawl intersecting the line including the com eluding afg'electro-niagnet, a power device in panion contact and the oint about which it swings, the mechanism U which the power device may o eratesaiil load including an op erating paw actuated by the power device and engaging said ratchet wheel, said pawl having cam engagement with the member carrying the contact that is companion to the contact carried 11 the first aforesaid,

pawl, serving to open t e circuit/of the elec tin-magnet after said contacts have been on- ,gaged, there-"being lost motion between the past! that is employed to transmit power the power device and the contact-sup:

porting mcm'berin cam engagement there with to permit the contactcarried by the first aforesaid pawl toq'iseand ru'b over the;

companion contact.v a

' -11. Apparatus of the class described in- "which nerg'yis sto ed the electro-magnet potwprl-devlce to eiia e the transmission of zed, 'moclmsm operable by said I it t rfm-m'worlg-a ratchet said 'switc ing mechanism including one contact wheel forming part of the load operaied hy the power device, a holding pawl adapted to engage the ratchet wheel to hold the same to enable the electro-anagnet to replenish power in said power device without distur' ing the load, and switching, mechanism for closing, circuit through said eleotro-inagnet when said awl has fresh tooth.- engagcmont, said switc ing i'ncehanisl'n including one contact carried by said pawl and a second contact mounted to rotate or swing about another point, the line including the point"aliiout which the pawl may swing and the contact carried by the pawl intersecting the line including the companion contact and the point about which it swn-igs, the point about which one of the contacts swings or rotates leing nearer the contacts time the point about which the companion con'tactswilws or rotates, the mechanism by, which 17 is power device may operate said load inohiding an operating pawl actuated'b .the wordevice and cngagingsaid ratc et-w och-said pawl having cam. engagement with the memto to the contact carried by the first aforesaid )(I'I' carrying the contact that is companion pawl, serving to open the circuit of tic-magnet after sa d contacts have heeiren gaged, there being lost motion between the pawl that is cm loved to transmit;

from the power t evice and the co1ita(Elf-silt}? porting member in cam engagement them,

with to perniit the contact carried by la ii!!! first aforesaid pawl to rise and rub over the", l

companion contact.

iii

12. Apparatusof the class described in;

eluding an electro ma net, a power devic'in which energy is storcc by the electro m'agnet when energized, mechanism opcrablejbysanil power device to enable the transmission of power therefrom to perform; work, a ratchet wheel forming part of the load operated by the power device, a holding awl adapted'to enga e the ratchet wheel to 101d the saineto 'enab e the electroginagnet to re lenish power in said power device without isturhing the load, and switching mechanism for closing circuit through said electro-magnet when awl has fresh tooth engagement, said carried by said pawl andfa second, contact mounted to rotate or swin point, the point about whic one of the con,- tactsswings or rotates being nearer the eontacts than the point about whidhthecoinpanio'n contact swiiigsor rotates, thefmeohabout another anisni by whichthe power device mayo el i V ate said load includinwn operating aw "acsaid. ratchet wheel, said pawl'having cam engagement with the member carrying the contact that is companion tothe contact tua'ted by the power device andje gaging i lost motion between the pawl that is employed to transmit power from the power device and the contact-supporting member in cam engagement therewith to permit the 8 contact earried by the first aforesaid pawl to rise and rub over the con-yanion Contact. L

In witness whereof, I hereunto subscribe ('L-L. CRAGG, I1. STROH.

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