US2002969A - Number plate for telephone dials - Google Patents

Description

May 1935- W. w. WERRING ET AL 2,002,969

NUMBER PLATE FOR TELEPHONE DIALS M Fild Jan. 51, 1954 FIG.

DEF ABC WWWERR/Nc; WVENTOR JTSHUXHAM A TTORNE Y ms l 2,002,969

airs!) STAT'ESTPATENT oFFlcEf NUMBER, PLATE FORTELEPHONE nIALs Walter W. 'Wcrring, Brooklyn, N. Y., and Trevor S. Huxham,'6hatham,*N. J., assignors to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application January 31, 1 9 34, Serial No. 709448 5 Claims. (o1 .-40-'-10.5)

Thislinvention relates to telephone. dials and trates the relative disposition of the several acemore particularly, to the number plates which tate films which are applied to the metal'ba'ckconstitute an essential part thereof. ing or base. V The'telephone dial number plate in common As illustrated by F g,- 2 the number Plate f use today consists generally of a. metal disc, this invention comprises a metalbase plate" H to enameled or otherwise provided with 'a smooth which is completely enclosed 'or enveloped in a opaque "upper surface upon which are printed or Coating olifilm C 0811111086 the otherwise impressed suitable dial characters; up er surface and edges of which are covered by The number plate is located on the dial immeditwo films I3 and M of white cellulose acetate and 10 ately beneath a rotatable finger wheel provided ransparent cellulose acetate respectiv ly, 10 with a plurality of finger holes-through each of film 13 being interposed between thevfilms 12 which, except the first one, several of the dial d 1 characters are visible when the finger wheel is e u e P a e I f h inventionmaiylbe in its normal or 'unactuate'd osition, Through manufactured in accordance with several meth- 15 theagency of the finger wheeL. a subscriber may 0618 which embody h ppl cati nof Sheet acel5 effect the transmission of any series of impulses tate, prayed acetate lacou r 0 a ombin tioni corresponding to the station designation ortelet a w w e d c b dphone number of any other telephone line, by a The ta ba i orbasemay bestamped inserting; in the proper sequence, vthe finger in asan aperturcd i s o o h rw s O the finger wheel holes corresponding to the digits sheet metal stock and sand blasted to provide it 0 comprising the number to be dialed and after with a rough surface to which the first film or each insertion, turning the finger Wheel in a coating of acetate adheres. The disc ll is-then clockwise direction to the limit of its rotation, as sp aye on both S d and edges W Clear determined by the position of a finger stop, and lulose acetate to provide it with the covering film then releasing the finger wheel. g i or envelope l2. This coating or film is allowed 25 It is the object of this invention to provide a to d y- A Sheet of White acetate s then p new and improved type of number plate for tele- (ad or otherwise provided with the dial characters phone dials which is substantially rigid and in 7 shown in Fig. l and is united with a sheet I4 of which the exposed surface is improved in its recl ar a tate by h t-pr ss ng r m nt After I sistance to the yellowing or aging efiects of light a permanent bond has been eifected between the 30 and to wear. V sheets or films I3 and "M, the composite sheet so This object is attained in accordance with a formed is applied to the upper surface or film l2 feature of thisinvention by providing a metal andhOt-pressed or cementedin position. This backing or base with a covering of'cellulose acecomposite sheet is of suitable dimensions to tats, which covering will not be afiected by light allow the edges thereoft'o be formed over the 5 as to cause discoloration and is resistant to wear rim or down turned edge of the disc I I. The macaused by light and wear. terial formed over the disc edge, as shown in More specifically, this object is' attained by Fig. 2, is hot-pressed to the underside of the disc, superimposing on and adhesively associating with the undercoating 12 of clear acetate serving to 40 a metal base plate a series of cellulose acetate provide an effective bond therefor. If desirable, films, one of said films providing a contrasting the formed over portions of sheets l2 and I 3 background for printed dial characters and may be crimped rather than hot-pressed to the another of said films providing a transparent underside of the coated disc.

protective covering for the printed characters, In accordance with a modified form/of the the several films and base plate being united in meth d of ma ufa tu j dth fil s such a manner as to provide a rigid integral 3 and I4 may be pp d pa ate vtc coated unitary numb r plate disc H. Thefilm' I3 is applied by spraying white The in entio il be readily understood fmm acetate lacquer directly on the acetate coating the following detailed description made with reffilm and 111511011 a manner as to COVel the erence to the accompanying drawing in which: disc edges and the underside of the disc rim. 50

Fig. 1 is a plan view of a telephone dial num- This coating is then allowed to dry and the dial ber plate made in accordance with this invention, characters are printed or otherwise impressed d V thereon. The clear acetate film l4 may then be Fig. 2 is an enlarged cross-section of 'a. portion applied in sheet form, being hot-pressed or ceof the number plate shown in Fig. 1 and illusmented in position and formed over the disc 55 .2 r edges as des'cribed in connection with the composite sheet of the previous method. If desirable,

the dial characters may be printed on the underside of the clear acetate sheet rather than directly on the white acetate film; in either case the white film constitutes a suitable background for theprinted characters. When the dial characters are printed on the underside of the clear acetate sheet, the white acetate may be sprayed directly on the printed surface to form the white background.

The number plate of this invention may also be made by an all-spraying method. This method distinguishes from the method just described only in the substitution "ofclear acetate lacquer for the clear acetate sheet, the lacquer being applied to the white acetate film by spraying. In this case no forming of material over the disc edges is required.- It is essential, of course, i that the dial characters be printed on the white acetate film prior to the spraying of the clear acetateafinish.

Irrespective of whichof the several methods of manufacture just described is resorted to, a dial number plate is produced which comprises a sub stantially rigid base member completely en- :veloped in anacetate film, the upper surface of ent cellulose acetate adhesively associated with said character bearing film.

2. A number plate for telephone dials comprising a base plate, an envelope of cellulose material in which said base plate is enclosed, a character bearing film of cellulose material and a transparent film of cellulose material covering said character bearing film, said character bear-.

ing film, transparent film and envelope being inseparably united one to another and supported by said base plate.

3. A number plate for telephone dials cornprising a disc-like base plate having a peripheral lip, an envelope of cellulose material in which said plate is enclosed, a character bearing film of cellulose material and a film of transparent cellulose material, said character bearing and transparent films being united to each other and covering the upper surface and lip portion of said enclosed base plate.

4. ,The' method -of manufacturing number plates for telephone dials which comprises enclosing a metal backing orbase in an envelope of cellulose acetate, applying to one surface and edges of said envelope a film or white cellulose acetata'printing dial characters on said white film and applying a film of transparent cellulose acetate to said printed'film.

5. The method of "manufacturing number I plates for telephone dials which comprises enveloping a metal backing or base in a film of a cellulose derivative, adhesively covering a'portion of the enveloping film'with a film of a cellulose derivative, printing "dial characters on said second mentioned film andadhesively covering it with a' transparent'filmof a cellulose derivative.

- WALTER,W. WERRING.

TREVOR S. HUXHAM.

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