US941763A - Bank of locking switch-keys. - Google Patents

Description

AE. R. CORWIN & (LA. BALS. l v BANK or" LooKINe s'wl'ron rms.

Arrmumlbnrunnnmae, 1mm.v A

941,763. Patented Nov. 3o,19o9.

0 o o o o 17 f i? f uff l l. 6

l oo oo oo o@ :Iso oo la zyf ELMEB 1a. coRWYIN AND CHARLES A. BALS,

TIGN F ILLINOIS. f

To all whom it may concern:y

Be it known tlmtvu'e, ELMnn R. Conwln and CHARLES A. BALS, both citizens of the pro United States of America and residents of Chicago, Cook county, llinois, have invented a new and useful Bank of Locking Switch-Keys, of which the followin is a specification, reference beingr had to t e accom )anying drawings, illustrating same.

"j This present invention is an 'improvement on our United States Letters'v Patent No. 902,275, issued October 27, 1908.

1 Our invention relates tobanks of locking switch keys of the push-.button t pe, the princi al objectsof our invention 'eing to provi' e improved' means for mounting such a bank of switch keys, to provide an improved casing for suoli a bank of keys, to

ide improvedmeans for connecting electrica conductors with the keys, to provide improved means for controlling the switch contacts of the various keys of abank in intercommunicating or party-line telephone systems, and `to provide improved means for releasing the various `keys of a bank by the depression of one of the keys.

Other objects will be apparent from the following specification. j i

In the accompanying drawings illustrating the preferred -form of o ur invention, Figurel is a side'elevation of a interior construction oft-he apparatus; Fig..

2 is an end elevation of the bank of locking switch keys shownffin `Fig-.1, with the inclosing casing shown in vertical cross-section to show the interior construction of the I apparatusgand Fig. 3 is a vertical crosssect1onal view of thebank of keys shown in F1os. 1 and, 2, takcnnnhne m of Fig. 1.

' o iike characters refer to like parts in the several figures.

In the drawings, 1 1 'represent a plurality :of push-buttons, euch beingI connected by a stem 2 with a plungerI 3 which is adapted and arranged to operate" and control a set of switch springs et, 5, 6, 7 and 8. In the sets of switch springs shown in Fig. 3 the springs of each set are all out of contact with cach other 'when thepush-button 1 is raised, thc depression of the pushbutton 1 causing the p unger 3 to engage the switchd aF-CHICAGO, fLLINoIs, ASSIGNORS T'o ooitwm TnLnPnoNnmANUFAo'rUmNG COMPANY, or CHICAGO, ILLINoIs, A consona- BANK Oli? LOCKING SWITCH-KEYS.

specification mi Letters Patent. Application illed January 29, 1909. Serial No. 474,968.A

bank of the improved locking switch-keys, with a perf ratentea Nov. 30,1909.

springsit and 7 and thereb cause springs 4, :'rnnct t3' to contact cach ot ier, and spring 7 to contact spring 8. lt will readily be understood, however, that the switch springs .(3 and 7 of each set may control any combination of springs ns desired.

rlhe various sets of switch slirings are ,mounted on u plurality ol uu'nlnting bars 9 9 preferably as shown, the mounting bars 9" 9 being held in place by a pair of end plates -10 10 as shown in l. `ig. 1. A plurality of coil springs 11 11 act on the respective plungcrs 3. 3 to raise the latter and the respective push-buttons 1 1 whcnt'hcy are vrev leased.-

The end plates'10 10 are suitably secured to the top plate 12 which serves as :n.guide for the various stems 2 2. rlheend 'plates 10 10 may be also mounted to a mounting base 13 as shown in Fig. 1, to securely mount the bank of keys as a whole in place.; The cover or casing 14 is placed over the bank ofkeys as shown? in Fig. 1 and is securely mounted to the .top plate 12 by screws 15 15 so that the cover 14 may be readily removed from the bank of keys when it'is desired to have access to the apparatu'swithin the cover 111. On, one of the end plates 10 10 is secured a strip of insulating material 1Gcarrying a plurality'of terminal strips 17 17 vadapted to accommodate lconductors leading from the various switch sprin 's of the bank of keys and also conductors ceding to the bank of keys from the exterior of thc casing 14 through openings 18 18 in the ends of the casing 141. It, willbe readily seen that this strip 16 with its terminal portions v 17 17 )rovidcs a greatly improved arrangeconductors.

The end plates 10 10 carry a pair of side bars 19 19 in notches therein, as shown in the drawings, these side bars 19 19 being held togetller by a plurality of cross bars 20 20. 'lhc side bars 19 19 carry another set o't'cross bars 21 21 adapted to engage notches 22 22 in the stem portions 2 2 as shown. o Each et the stem portions 2 2 is provided with a pair ot error..

notches 22'22 therein for the reception of a cross bar 21, the pair of notches'22 22 in each stem portion 2 being beveled on their upper faces so ythat .the depressionotE the corresponding push-button operates the side bars 19 19 and the cross bars 20 20 21. 21

a unit, end'wise, so as to release any of the other keys which iuay have been previously depressed. '.l`he beveled surface on each of the upper notches in the stein portions i i 2 is tor the purpose. of causing the release ot' the -va'rious keys ot the bank by a furtlicr depression ot any of the push-buttonsl l 1, past locking position, when nioi'e vthan one of the keys, or all of. the keys. are loeked iin locking position, that is, in the position jection to such banks of locking keys, by pro- Viding the iipperbeveled notches on the various stems 2 2 for the purpose stated. The

*side bars 19 19 carry still another cross bar 2t; against which a' leaf spring 24 bears to operate the side bar unit 19 1t) 20 20 and 2l 2,1V as a whole, endwise, to cause the cross bars 2t 21 tOengage the various notches 22 22 of the stems 2 2. The leaf spring 2t is carried by'oiic of t-he end plates 10 preferably as shown, the end plate l0 being providedv with an adjustment screw 25 for regu lating the tension of the spring 24 against the cross bar 23,

Each of the pliingers 3 3 and the notches 22 22,.:issociatcd therewith, are constructed so that when any of the push-buttons l 1 is depressedfroin normal position, .itwill cause the release of any of the )fish-buttons which mayiliave bcen,previoiisly depressed to locking position, before it lcauses the switch springs 6 ain'd 7 thereof to switch any When,

of the contacts of its set of switch springs.

This is for the purpose of clearing the telephone eircuit ot' other connections, in an intercoinninnicating or party-line telephone system, helore the telephone is connected with t e circuit leading to the key which is being teicoinmiinicat in g telephone systems.

any ot' the push buttons l l is depressed to locking position, that is, to the position in' which its cross bar 21 rests in the iip'perv notch'i'. of the.'kgy, the switch springs (5 and 7 are engaged by the enlarged portion 3 of the plunger as td cause springs 6 and 7 to engage springst') and8 respectively, spring 4 being` still out of contact with sprintr 5. Now a -l'iirtherdepression` ot'ithe puslrbut.-

i ton, that is, past thc ,locking position,.causes the switch spring (i to engage the upper beveled portion 26 ofthe plunger and thereby cause the spring 5- .to engage the spring 1,

In keys heretofore made it was possidistributing strip and having anfopfening positionreleases any vofthe other keys whicliwithout operating the switch spring 7 farther.v This construction gives a smooth, easy action to the push-buttons. The eonv tacts t3 5 and 7 S are generallyithe talkingcircuit contacts in an intercomiiiunicating telephone system, the contact 5 t being a. ringing contact. s 'l`lie bank otl keys is provided with one push-button 2 which is connected witha stein 2S haring a single. long beveled notch :9 therein as shown iii l"ig.1. The plunger :itt-on this stein 2S is so constructed that. it

switches its switch contacts before it releases anyo't thepush-buttons l '1 which 'I may have been previouslydepressed. This 30 isft'or the purpose ot holding a trunk line iii an iutereoininuiiicating telephone sys-` teni. while a party called Lby' the attendant;` answers an incoming triuik all;` the key 2T establishing'a bridge i'icrossthe incoming common-batter i trunk when depressed, hetore the attendantstelephone disconnected from the .ti-link, t0 avoid' giving the4 operator at. the ,common-battery elxchangea` disconnect signal. buehY a. construction greatly improves th'c `handling of ineomi'ii vtriiiilecalls from a conin'ion-bstttery telef.

phone system to an intercoinmunicating telephone systein. It. will readily be seen` that the key 27 is not-locked indepresstades'4 position, because .it has but Iasingle notchl 2S) iii the sten )ortion 28.

We do not. wish to limit this invention to all of the exact details of construction` hert-in shown, as various modifications inisaine may he made without departing from `thc scope of the 'appendedclaims., i

W hat we elaini as our invention is: y

l. A bank of switehkeysroinprisinga suitable li'ainea'nd a pluralityzof;ipushfbiits. ton switches, adapted to be mounted t.toil suitable base, a `distribiitinf"stri l L ing-terminals thereon carriet'by tie 4 d frame whereby conductors i leading ff-froni the said switches..may',he connected-with external conductors leading to theL bank of keys,-and la` removable easing carried by the bank ot' keysuiid attachedthereto, the said casing iiiclosing thesaidlsivit'che` '115 l llieiethroiiiih A for" accommodating ternal condiictors vleading to thelist strip. .f v .y 2. A bank of switch keys having a lur'al-f' ity of plungersand switches ada te .'tobe 120 operator-l thereby,l means for loc g'st nfnev fof the phingers in depressed position, means, l

associated with at-4 least one of the plunger-s whereby the .depression thereojf'from normalhv niay have been lockedin depressed position," A I' before the p-linigcr' which vis being depressed i Switches its .switchcontacts at least one of'y the phingers being constructed' so that it switches its switchcontacts before causing i the release of any of the other plungers which may have been locked in depressed position. Y 3.,A bank of locking switch keys comprising a plurality of pl angers and switches adapted to be operated thereby, means for l locking the various keys in depressedpolsition, means associated With each of the, plungers whereby the depression thereof releases any of the other plungers which ma1 have been locked in depressed position, z some of the plungers being constructed so as to cause the release of the other plungers, when depressed, before switchingr their switch contacts, and at least one of the: plunger-s being constructed so as to switch i its switch contacts, when depressed, before causing the release 'of the other plungers.

4. A bank of switch keys having a plurality of plungers and switches adapted to be i operated thereby, means for lockingr soule of the plunger-s in depressed position, means whereby the depression of atv least one ot' the plungers causes the release of the otherpluugers which mayv have been looked in (.iellressed position, and `means assm-iated wit-h at least one of the plunger-s whereby the depression thereof from normal position switches its switch contacts before causingthe releaslevof any ofthe. other plungers which may have been locked in depressed position.

.\s inventors of the foregoing, we hereunto subscribe our names, this 26th day of January, 1900.

IlLMlll-i i. CORVN.

AN. ]5;\l1s.

Fmannalcn R. Palmi-:a 1 FRANK RYAN.

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