US1994309A - Typewriting machine - Google Patents

Description

March 12, 1935. GgG. GOING rTYPIEWRITING MACHINE Filed Feb. 24, 1933 WW/ ////w7/A Hml INVENTOR HHH ATTORNEY Patented Mar. 12, 19.35

TYPEWRITING MACHINE GeorgeV G. Going, Glenbrook, Conn., assiglnor to Remington Rand Inc., New York, N. Y., a corporation of Delaware Application February 24, 1933, Vserial No. 658,397

9 claims.

My invention relates to typewritingand like machines and more particularly to the platens thereof. l l

The main object of my invention, generally stated, is to provide an improved, substantially noiseless platenV which is simple in construction, comparatively inexpensive to manufacture and highly effective in use. That is to say', a platen which is highly effective as such in use and yet reduces the noise ordinarily produced fromrthe impacts or hammer'blows of the types thereon to the minimum and to such an extent as to be substantially noiseless.

-To the above and other ends which will hereinafter appear my invention consists Vin the features ofrconstruction, arrangement of `parts and combinations of devices set forth inthe following description and particularlypointed out in the appended claims.

In the accompanying drawing wherein like reference characters indicate corresponding parts in the different views- Y -t Y Fig. l isan enlarged, detail front view of one character of platen and some of the associated partsconstructed in accordance with my invention, the platen being showndetached and with parts in section. 1 f `Fig. 2 isan enlarged, detail, transverse, sectional view ofthe same, the -section being taken on' the line 2-2 of Fig. land looking in the direction ofthe arrows at said line.

Fig. 3 isa fragmentary, detail; front View partly in section of amodified form of platen embodying my invention.

Heretofore many attemptshave been made `to produce av substantially noiseless platen, but for one reason or another they have all proved un-- successfuk Various materials, suchVv for example as sponge rubber, have been used in the construction thereof, but none of them so far as Iam aware has ever provedsuccessful orhas gone :into use on the market. The employment of-sponge rubber is of no practical use sincethe large nurn-v ber ofair pockets in therubber is apt to result in the production of as much or more noise than the rubber sheathed platens ordinarily used.v Moreover, the use of sponge rubber'for a` platen renders the platen ineffective as such aside'from the noise vwhich results from its use.`

I have discovered that by making a solid homogeneous compact rubber platenor such a rubber platen or such a rubber platen with particles of corkembedded therein and the platen in each'instance having a solid metal core, I am enabled to produce a highly enicient` platen which is substantially noiseless during the impacts of the types thereon, and such a'platen has proved highly successful in usejfrom every pointof view.`

When a compound of rubber and comminuted corkV is `used for the platen,4 as shownV in Fig.A 3, the cork is Vemployed primarilyxto reduce -the weight of the platen without destroyingv the 'qualities of the rubber or affecting the usefulness of the platen. r By the term homogeneous rubbenor rubber and cork, body portion of the platen', employed herein, I mean to distinguish from a platenbody built Lup from laminatiOns, layers' or sheathsk of rubber, or rubber and othermater-ials such as cork.' By the use of the term compactherein` in designating the: character vof the rubber, vor

rubber and cork, employed in makingI the b-dy portion of the platen, I mean to distinguish `from sponge rubber and the like which is. not compact in its structure andfcould not be'used 'effectively forV the purposesof the present invention.l The quality Aandcharacter of rubber that in'practice I-have found to be highly efficient corresponds substantially to" that usually employed in making rubber feet for typewriting machines Yand for making shoes for pneumatic tires.

VBy the use of the term solid platen, I mean to designate one which is not hollow, or is devoid ofan open core extending therethrough I will now describe two specific embodiments of my invention, as it is disclosed in the'accompanying drawing. y Y Referring more specically to Fig. 1 the cylin` drical body portion 10'of the platen is made of a homogeneous mass of compact rubber thatextends from the periphery of the platen substantially to the axis thereof, Where it makes contact with an axially disposed solid metal rodor spindle 11. The homogeneous,compact rubber is of the character hereinbefore referred to. The solid spindle 11 is shown ,in the present instance to terminate at its ends before reaching the end vplates 12 and 13 of the platen., The spindle therefore is free from contact with said platen heads or with any metal part of the machine, being insulated therefrom by theA rubber that constitutes the body of the platen, the spindle being carried vand supported wholly by 'such rubber body. The spindle 11 in the construcf tion as thus far described constitutes a stiffening device at the core of the platen to Vmaintain it sufficiently rigid to prevent a-'bending thereof out of its truecylindrical form. It will be seen that in .this construction the rubber body -10 and the spindle 11 constitute a platen devoid of an opening through the core thereof.

As shown in the present instance the end plates 12 and 13 are secured directly to the rubber body portion of the platen by screws 14 and 15 respectively andthe end plates are in turn supported by the carriage, thus entirely insulating Vsaid body portion 10 from a metal-to-metal contact which if' permitted might result in conveying vibrations from the body of the platen to the carriage and result in theV production of some. noise. However, it has been demonstrated in acter described With a supporting shaft orspindle on Which the rubber body is molded and supported by said shaft in the carriage, is so Yhighly effective as to reduce the noise that ordinarily results from hammer blows'of the" types against the platen to such an extent that it is. negligible. Y Therefore, under the broader aspects of my in-` vention the platenheads maybe connected to the platen in any suitable manner.

The line spacing Wheel ,16; maybe secured to theplaten body by any suitable means. In the present instance I have disclosed the connection ofV the linev spacing.- wheel to the platen through a platen clutch', Wlnchpclutch may be of any suitable. character but must be one that may be mounted outside of the body portion of the platen and' does not requireV a hollow platen to receive The clutch shown in the present instance is similar to `that employed in the No. 6 Remington Noisel'essmachine and is disclosed inthe patent toqBarney No. 1n-793749'. Therefore, only a very 'generalreference thereto will* be made herein.

1 The line spacing Wheel 16 is mounted to turn With-.andi to permit an independent turning movement of the platen'. As shown the ring-like line spacing Wheel is adapted to turn freely on the platen head 12y and is providedwith' ne inwardly extending teeth 17 aswell as outwardly extending teeth 18.. A cover plate 19I is secured to the platen head 12 by machine screws 20, and holds theline spacing. Wheel against outward Vdisplacement from said platen head. The platen head- 12 is channeledV radially to receive and guide three paw-ls 2-1 which are stressed avvav from the teeth 17 by a circular contractilespring 22 which coacts. with all of said pawls 21. Three plunger camsl 23y coact with` the inner ends `of the. pawls- 21 and' normally force. the latter into engagement with the teeth 1'7 to connect the line spacing, Wheel to turn with the platen. rlhis engagement is'maintained by the excessive force of springs 24; each of Which is stronger than andY overcomes. theforce of. the spring 22'.

A release of the paWlsZl to: enable the platen tofbe, turned. independently of the: line spacing wheel is effected by a longitudinally movable spindle. 25 that` carries a ring 26v at the inner end thereof. and. isA provided. with aA finger. Wheell 27 at the outer end thereof. The ring 26 is. received ina out-out 28 in each of the cams. 23 and effects a Witliclrawal thereof when vthe finger Wheel 27 ispulled out'.v

It Will be understood that the .line spacing wheel and clutch construction as a Whole are detachably connected to the platen head 12 by screws 14 and are directly connected't'o the rubber platen body. i

Inl the construction as shown the finger Wheel 27 is` detachably connectedv by the usual screws to a. spindle 25" carried by the platen head 12.

v In Figa'B'l have shown a modiedformof'platen body 10a-1 made of rubber of the same general character as that previously described with par.

ticles of comminuted cork embedded therein throughout the body as indicated at 10b. This results in the provision of a materially lighter 'l Cil mounted and'rcombined with'the remaining parts y of the platen as hereinbefore described and all of the characteristics of the previously described platen are inherent in combined rubber and cork practice that the solid rubber platen ofthe char- Various. changes may be made in the conj struction, and certain features thereof may be 'i new and desire to secure by v v.

to and inicontact 'with a single axially disposed! solid metal spindle receivedtherein,Y saidA rubberVV body portion Vand spindle' constituting .a solidi ai platen devoid of' an opening through the clore thereofv and the" outer surface of said compact' massY of rubber constituting the. surface against' which the typesiimpact; Y i

2. A cylindrical platen for. t Vyin-'iting andY like machines comprising a body portion of homogeneous compact rubber. extending in a solidi' mass from the Vperiphery ofthe platensubstantiallyto--the axis thereof and to and in ContactY with anr axially disposed metal, spindle received therein, said spindle being supported'wholly byV the rubberl body portion of the platen.

31A- substantially noiseless cylindrical platen for typewriting and like machines'comprising a bodyv portion'` of homogeneous compact rubber Y y extendingin a solid mass-from the peripheryA of' the platen substantially tothe axis thereoff'and; to and in Contact Withan axially disposedv solidi metal spindle received therein, saidrubber body' and end plates xedly secured directl-yf to the Aportion and spindle constituting a solid-'platen devoid of an opening through thecore'thereoL v rubber body portion of the platen-thereby in. Y

sulating said bodyportionof theV platen from said end plate and preventing vibrations fromy being transmitted therethrough. j

4. A `cylindrical platen kfor typewriting'- `and like machines comprising a; body portion of platen comprising a solid mass of homogeneous compact rubber with particles of'. cork imbedded therein throughout the mass, said mass extending from the periphery of the platen substantially to the axis thereof and reducing the noise ordi- Y narily produced from the impact'of the typeV bars on the platen to a minimum, the periphery Vof said mass constituting an even which the types impact. y A

6. A substantially noiseless cylindrical platen surface against spindle constituting a. solid platen devoid of anY opening through the core thereof. v

'7. A cylindrical platen for typewriting and like machines comprising a body portion 'of homo-V geneous compact rubber with particles of comminuted cork imbedded therein, said body portion extending in a solid mass from the periphery of the platen substantially to the axis thereof and to and in contact with an axially disposed metal spindle received therein said spindle being Y supported Wholly by the body portion of the platen.

8. A substantially noiseless cylindrical platen for typewriting and like machines comprising a body portion of Vhomogeneous compact rubber With particles of comminuted cork imbedded therein, said body portion extending in a solid mass from the periphery of the platen substanv tially to the axis thereof and to and in contact withV an axially disposed metal spindle received therein, said bodyrportion and spindle constituting a solid platen devoid of an opening through the core thereof, and end plates secured directly tol the body portion of the platen.

9. A cylindrical platen for typewriting and like machines comprising a body portion of homogeneous compact rubber with particles of cork imbedded therein, said body portion extending in a s'olid mass from theperiphery o the platen substantially to the axis thereof and to and in contact With an axially disposed metalspindle received therein, said spindle being. supported Wholly by the body portion of the platen, and end plates secured directly to the body portion of the platen.

Y GEORGE G. GOING,

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