US1028029A - Stylus. - Google Patents

Description

O. D. KILLBBREW.

STYLUS.

APPLICATION FILED NOV. 27, 1911.

1 29 Patented May 28, 1912.

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To all whom it may concern Be it known that L'OSCAR'Di'KrLLn nEW,

a citizen of the'iUnited States, residing at the usual carbon papers or other duplicating mediums, the stylus, according to' the pres ent invention, embodying a tip which is preferably pointed toward the end and is provided with a spherical body or. ball of hard material such as steel, the ball los ng confined by the tip to prevent displacement,

and it is provided with a spherical seat which sustains the pressure of the ball but permits the same to revolve freely wh1le traversing the paper in any direction, thus enabling considerable pressure to be exerted on the ball without puncturing or otherwise damagingthe paper or medium upon which the ball bears. v A. particularly advantageous feature of this invention is obtained by crimping the end of the tip to prevent displacement of the ball in one direction and introducing Babbitt or other soft lubricating metal into the hollow .tip above the ball to prevent upward movement thereof and to form a spherical seat to sustain'the pressure of the 5 ball, the Babbittor soft metal acting as a. lubricant for the ball of steel or other hard material and thereby avoiding binding or uneven wear of the ball and insuring an even rolling action of the ball on the paper 40 or other material.

To these and other ends, the invention consists in certain. improvements and combinations and arrangements of parts, all as will be hereinafter more fully described, the

novel features being pointed out particularly in the claims at the end of the specification.

In the accompanying drawing :Figure 1 is a general view of a stylus constructed in accordance with the present invention; and Fig. 2 represents an enlarged axial section through the tip showing the mounting of the ball.

Similar parts are designated by the same 5 reference characters in the several views.

In the accompanying drawing, 1 have v seamen; team was. Application filed mamas anion. Serial No. 862,767.

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5 shown the preferred embodiment of the' inveritiong although it will .be understood that equivalents may :be substituted for certain features of the construction shown. In the which is preferably composed of sheet metal being tapered to approximate a point, and

-the upper end of the tip in this instance provides a socket 2 to receive the end of asuitable handle 3, j p

The lower end of the tip, which-is circular in cross-section, is crimped to form an inturned retaining fiangeo, and a ball or spherical body 6 is contained in the lower end of the tip and cooperates with the retaining flange, the lower portion of the ball projecting below the retaining flange, the

internal diameter of which is somewhat less than the diameter of the ball 'to prevent dropping of the latter from the bottom of the tip. The back orupper side of the ball coiiperateswith a spherical seat 7 contained within the hollow tip, and this seat sustains the pressure or thrust of the ball while the stylus is in use. composed of relatively hard material such, for example, as steel, to avoid wear thereof, and the. seat is composed of relatively soft material such, for example, as Babbitt or similar soft metal, as the latter will then serve as a lubricant for the ball and will thus prevent binding or uneven wear thereof. Moreover, by providing a seat of soft metal, the manufacture of the stylus is greatly facilitated.

In manufacturing the stylus, it is preferable to first form the tip with the crimp or retaining flange on the lower end thereof, the ball is then introduced into the upper end of the hollow tip and will center itself on the retaining flange, and finally, a small quantity of molten Babbitt or other suitable soft metal is poured into the tip while the latter is in vertical position, the ball then closing the bottom of the tip and constituting a core over which the soft metal will cast a truly spherical seat. In order to positively lock the seat from displacement under the pressure imposed thereon by the ball,

that portion in which the seat is formed may be recessed or grooved internally as shown or otherwise adapted to securely anchor the seat in proper position.

I claim as my invention:'--

1. A stylus comprising a tubular tip havpresent instance, the stylus emhodiesa tip 1 -.intubular form, the lower end of the tip Preferably, the ball is ing a tapered end formed with an inturned flange, a spherical ball cooperative with said having a portion projecting beyond said flange, and a rigid abutment formed separately from the tip and inserted therein behind the ball and'having a hemispherical seat revolubly engaged by the ball.

2. A stylus comprising a tubular tip having an inturned retaining flange on its lower end, a spherical ball of hard material rest ing on said flange, and a stationary seat of flange and relatively soft material cast in the tip above the ball and having ahemi-Spherical-caVity which is revolubly engaged by the ball, the

tip-having means to key said seat rigidly 15 therein.

In testimony whereof I have hereunto set my hand 1n presence of two subscribing witnesses. 1

OSCAR D. KILLEBREW.

Witnesses CHAS. S. Hm, JAMES L. NORRIS, Jr.

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