US1235756A - Noiseless type-writer platen. - Google Patents

Description

.Patented Aug. 7,1917.

imme/woes HEELS H, ANDERSON, OF EAST HAMPTON, CONNECTICUT, ASSIGNOR E ONE-H3145 TO "WILLIAM A. LORENZ, 0F HARTFQRD, CGNNEOTICUT.

NQISELESS TYPE-WRITER. PLATEN.

Application filefi September 9, 191* Serial No. 880,880. Renewed December 3!), 1916. Serial No. 138,928,

lefi Type-Writer Platens, of which the following is 2t specification.

lily present invention relates. to new and useful improvements in writing machine platens and particularly to what are known as noiseless platens.

' The primary object of the invention is to produce a noiseless platen for machines of the above class which will be simple and inexpensive to manufacture and which includes a metal tube or cylinder of novel construction'having ellicient noise absorbing qualities as will later be more fully explained.

With the above and other minor objects in view my invention resides and consists in the novel construction and or *ungengent'of parts shown upon the accompanying sheet of drawings forming a part ofthis specification, upon which similar characters of rel?- erence denote like or corresponding ports throughout the several figures andv of which,

Figure 1 shows a longitu dinel sectional elevation of my present novel form of noise less typewriter platen.

2 is an end view of the some. 3 is a cross section taken on line 3-3 Fig. Fig. of Fig. 1 end 4 is a detail end view of my novel form of sheet motel tube forming the core c of the platen.

will be noted the platen is made up of several internal collars that are located within a special form of spirally wound sheet metal tube or core and which is so coustructed and arranged as to retard and absorh the sounds caused. by the striking of the keys upon the surface of the platen. lhis tube is formed the hill length of the platen and over its outer surface is placed a,

hard rubber covering against which the type of the writing machine operates. The 'ilcten as thus formed. is not only no1seless out 18 light in weight besides being durable and simple to manufacture and assemble.

Specification of Letters Patent.

ch sctscrmvs 7 are seated to engage the Patented Au fi, 31%1'22 shaft and secure the platen thereto. Screws 8 serve to secure the end caps to the end collars 9. Insulating washers 10 are seated around the head of the screws and in re cesses of the end caps and serve to insulate the connection between the said end caps and the screws 8. An insulating washer 11 such as felt or rubber is also preferably arranged under the es and between it and the collars and metal tu e. In addition to the end coller 9 I preferably employ a, centrally arronged collar 12 which serves to support the lntermediate portion of the tube 13. These collars 9 and 12 are preferably made of wood.

and ere each provided with a large central opening 14- therethrough for the introduc tion of the supporting shaft.

The core, as before stated, is made of sheet metal as for instance sheet steel and is rolled to form a tube of the required diemster as shown in Fig. 4 and which when completed will represent several windings of the This tube is held in shape by semetal. curing the outer longitudinsl edge portion 15 of the metal sheet to the outer surface of the outer cylindrical body, as. by means of solder indicated by 16 in Figs 3 and l. The secureinent of those portions of the tube together in this manner insures the forms tion of a rigid tube oi: c uniform outer diemeter and whose peripheral surface is smooth and finished to receive the relatively hard rubber jacket or cover 1? that fornis the working surface of the platen. The in.-

ner edge portion, 18 of this sheet metal core is lefti ree and unsecured to the main outer shell, except so as it mayfrictionelly enhe inner well o'fthe outer winding by metal to unwind, T 1-8 result of thisinner and loosely woun Qortion of the tube is to effectively absorb ad waves nrodueed by the A tube foiuied in this not have the .SOlHlfl-CEH'I a solid or single wound tube thus is more eilicient a core for noise reducing platen.

The collars before mentioned may be he d in position by friction or referebly means of smell as ind 1 and which may be 5' ivcn throu both the outer oer co oil metal tube one. into q wiously the col s liuvlh thus described in invention What no res that reason of the staring; tendency in the form a tube of a plurality of thicknessesl cleiin and desire to secure by Letters Pat ent is 4 1. A typewriter luten, comprising in part a core formed 0 sheet metal and rolled to form 2* tube of a plurality of thicknesses and Whose outer longitudinal edge portion is secured to the adjacent peripheral surface'of the tube.

2. A noiseless typewriter platen, comprising'a core formed. oi sheet metal rolled to and "whose outer longitudinal edge portion is se eui'edtot ie adjacent inner surface of the roll, and. Whose inner windings are dispesed layer of sheet metal rolled to form an i flexible tube oi a plurality of thicknesses and Whose outer longitudinal edge por is secured to the core.

against the inner Wall of the tube and Whose "inner edge portion is left free v Atypewriter platen, comprising in pert metal core comprising a rigid tube and 11 tion iJA typewriter platen, comprising parte metal core comprising a rigid tube and a layer of sheet metal rolled to form; an

inner flexible tube of a plurality of thicknesses and whose outer longitudinal edge portion s secured to the core, a collar Within. the tube, end caps and a suitable severing 5. A core for a typewriter pleten'; comprising a rigid metal tube and a plurality of thicknesses of sheet metal loosely Wound therein and one of Whose longitudinal edges is secured to the inside oi the tube and Whese other edge portien is left free.

typewriting platen including in ,4 tub-e and a plurality of windings of sheet metal contained therein and Whose tendency is expand and hug the inner W all e tube and Whose inner edge portion is censisting of continuous v be" if; formed o e cylinder liming lumber of layers, and

core,

ten in the county of ile e and Eltai Connecticut this 2nd day of A 1916i.

EELS H.

oule'" eore rein-

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