US888556A - Type-writer platen. - Google Patents

Description

110.388.556. A PATENTED MAY 26, 1908.

W. R. VAN SLYKE.

TYPE WRITER PLATEN. APPLICATION FILED FEB. 5, 1907 w Y' Q. w

Wi h1 @com sTATns PATENT ormoni.

WILLIAM a. vAN sLYKE, or EVELETH, MINNESOTA.

TYPE-WRITER PLATEN.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed February 5, 1907. Serial No. 355,881.

T 0 all whom it may concern:

Be it known that I, WILLIAM R. VAN SLYKE, a mining engineer, citizen of the United States of America, residing at Eveleth, in the county of St. Louis and State of Minnesota, have invented new and useful Tm rovements in Type-VVriter Platens, of which the following is a specification.

This invention relates to improvements in typewriter platens, and particularly to the construction of a platen whiciL will materially reduce or completely deaden the noise resulting from the striking of the type bars against the platen.

The object o'f the invention is to provide a.

simple construction of platen designed to secure this advantage, and in which the construction is such as to permit ready asseinblage of parts in forming the laten and disassemblage of the same in ma ing repairs.

ln the accompanying drawing-Figure l is a longitudinal section of a typewriter platen embodying my invention. Fig. 2 is a plan view of the tubular body thereof. .'Fig. 3 is an end elevation of the platen. Fig. 4 is a cross section thereof.` Figs. 5 to 8, inelusive, are' detail sections, showing heads diering inconstruction for connection with the ends of the tubular body.

In carrying myinvention into practice, I provide a platen comprising a tubular body 1, and end pieces or heads 2 and 3. The tubular body 1 is open at each end and is preferably formed by moldingor otherwise of vulcanized rubber having embedded therein one or more concentric tubes or layers of wire cloth o1' other woven material 4' of any desired mesh. Preferably at least two 'layers or tubes of reticulated material are after described.

The end pieces or heads 2 and 3 are preferably forme of cast metal, and are connected by a hollow or tubular core 5 adapted for the passage of the usual platen spindle. The core is preferably cast integral with the head l2 and is threaded at its free end, as shown at y6, to enter a threaded opening 7 in the head 3, whereby the latter is secured thereto. The heads are annularly grooved to receive and hold the ends of the cylinder or tubular body portion 1, and to this end each head is rovided with a pair of inwardly exten ing Hanges 8 and 9, forming an intervening groove l() to receive the adjacent end of the cylinder'.

In the form shown in Fig. 1,the ends of the cylinder are reduced to enter the grooves, and the inner surface of eachiiange 9 is beveled to crowd the same against the flange 8, thus securing a tight connection. After one end of the tubular body or cylinder has been slipped into the groove of the head 2, the head 3 is applied in position, and its groove receives the outer end of the cylinder, rubber or other suitable cement being employed to secure the said ends of the cylinder to the heads and to hermetically seal the joints between them. A similar cement is also provided between the threaded'portions 6 and 7 to hermetic'ally seal the joint between the head 3 and core 5 at their point of connection.

within the platen between the cylinder or tubular body portion and core 5 to receive a confined body of air, which backs said cylinder and holds it inflated and at the same time permits it to yield sufliciently to cushion the action of the type bars, the escape of thel confined body of air being prevented by hermetically sealing the joints in the manner Adescribed. The head 3 may be suitably constructed in practice for the application thereto of any fparticular type of end plate characteristic o different makes of typewriters.

Air is introduced into the chamber 11 through the medium of an air valve mounted upon the head 2, which valve comprises a casing 12 threaded into an opening 13 into said head and projecting interiorly and eX- teriorly throu h the saine.` The outer end of A embedded therein.

-duced' end of the cyli through the inner en d wall of the casing and is normally held in closed position by a coiled spring 18, said spring encircling the stem between the valve .and

may be charged with air in a convenient manner, the valve opening to. allow the air to enter, then closing to preventits escape. The outer 4end of the casing forms a tubular receptacle 19 to contain a sealing medium of anykind to prevent the ossible escape of any air after the cham er 11 has Abeen charged, and the joint between the casing and head 2 is sealed by. the use of cement in the manner previously described.

It will thus be seen that a practically noiseless or sound-deadening platen will be provided without the use of an interior airolding and cushioning tube, and that thev strength of the cylinder or tubular body portion and its capacity to sustain wear, as well as its sonnd-deadening qualities, are increased by the use of the reticulated fabric If through wear it is found at any time necessary to replacethe cylinder l with a new cylinder, the parts may be disassembled by forcibly unscrewing the head 8, whereupon the cylinder maybe disconnected and a new one applied to the heads in its place in the manner previously described.

In Figs. 5 to 8, inclusive, I have shown different ways of. securing the ends of the cylinder to'the heads, the construction shown in Fig. 5 differing from that shown in Fig. l only in omitting the beveled portion of the Harige 9, thus obviating the necessity of reducing the ends of the cylinder. In Figs. 6, 7 and 8 but a single flange is employed, the llange 9 in Fig. 6 being internally beveled to form a seat face for-the beveled end of the cylinder, while in Figi? the flange .9b is set inwardly from the peri hery of the head and engages the groove in t 1e end of the cylinder, and in Fig. 8 the .flange 9 is set still farther inward and forms a su port for the unren er which is secured upon the outer surface of the same. Any of these or equivalent modes of connecting the ends'of the cylinder with the heads may be employed.

Having thus described the invention, what is claimed as new, is

1. A typewriter platen having an impact surface formed of hardened plastic material, said surface being provided with a plurality of layers of woven reticulated material embedded therein, said layers being in spaced relation, with the strands of one arranged in planes crossing the interstices of the other to dispose their meshes out of alinemcnt, whereby to provide a compound barrier against the.

passage of sound waves.

2. A typewriter platen comprising heads, each provided with a pair of concentric in- ,wardly extending flanges forming receiving grooves, the outer flange being internally beveled or flared, a tubular non-resonant body provided with a layer of reticulated material embedded therein and having its endfportion reduced and fitted within said grooves and clamped by the beveled faces of the outer flanges against the inner flanges, a hollow stem integral with one of the heads and having a detachable other head, and means for infiating the platen. y I

3. A typewriter platen comprising end heads, one provided with a threaded opening, a tubular core or stem connecting said heads, a tubular, non-resonant body terminally secured to the heads and forming with said heads an interior air chamber, and an inlet valve comprising a casing extending within and without the perforated head and eX.- ternally threaded to therein, said casing being provided with an intermediate air port, an inner end wall, side ports in the inwardly extending portion, a stop flange on the outwardly extending portion to limit its inward movement, said outwardly extending portion being provided with a chamber to receive a sealing medium, a valve mounted in the interiorly projecting portion and controlling the ports, a stem connected with the valve and slidably engaging the inner end wall, and a coiled spring encircling the stem between the valve and inner end wall.

'In testimony whereof, I afhX in presence of two witnesses.

WILLIAM It. VAN SLYKE. Witnesses 'D..W. FREEMAN,

El?. ItUMsEY.

my signature connection with theA engage the opening

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