US2175349A - Pen point - Google Patents

Description

` Oct. l0, 1939.

W. T. HAME'R v PEN POINT Filed Dc. 2, 1936 ATTORNEYS Patented Oct. 10, 1939 PEN POINT William T. Hamer, New York, N. il.,l assignorv I to Eagle Pencil Company, New York, N. Y., a

corporation of Delaware Application December 2, 1936, Serial No. 113,767

4 Claims.

My present invention relates to pen points and while desirably embodied in steel, preferably in stainless steel, is also useful for gold pen points.

Among the objects of the invention are to pro- 5 Vide an inexpensive pen point, which though made of steel will approximate the desirable writing characteristics of a costly iridium tipped pen and in particular will write smoothly, without the scratching or sputtering due to the catchl ing of the sharp point on the iibre of the paper, so frequently incurred in the use of ordinary steel pens.

Another object is to provide a pen point of the above type made of a single blank without l acsessory elements such as tips attached thereto, which shall have superior ink feeding properties and in which the desired hardness orv resiliency of the metal is not impaired because of any undue mechanical strain on the metal stock in the 20 course of fabrication of the pen.

Another object is to provide a method of shaping a pen point and more especially a stainless steel pen point which can be expeditiously and inexpensively executed without the need for any 25 heat treatment, to produce a product of uniform excellence.

In the accompanying drawing in which is shown one of various possible embodiments of the several features of the invention,

Fig. l is a perspective view on a somewhat enlarged scale of the pen point,

Fig. 2 is a plan view of the curved blank from which the pen is fabricated,

Fig. 3 is a view similar to Fig. 2 showing the 35 blank with its aperture and its longitudinal slit,

Fig. 4 is a sectional view on a larger scale illustrating the method of rolling over the point of the pen, and

Fig. 5 is a fragmentary view on a greatly en- 40 larged scale showing the point construction of the completed pen.

Referring now to the drawing, the pen point is made from a blank I0 and comprises the usual somewhat tapered cylindrical shank II and the 45 more nearly flattened triangular point end I2, which however is elongated as a rectangular strip I3 at its point. The strip I3 is quite soft and can readily be bent to desired form as hereinafter described.

In Fig. 3 is shown the central aperture I4 and the longitudinal slit I5 cut into the blank either by a separate operation or in the initial process of stamping out the blank, said slit extending centrally and longitudinally of the blank.

In the sectional view of Fig. 4 is shown the (Cl. 1Z0-109) forming die I6 which has a transverse cylindrical tunnel Il and a tangential inlet slot I8 through which end I3 of the pen point is inserted. As the pen point held in a chuck (not shown) is pushed forward, strip I3 is rolled backward along the concave surface of the die for a half turn to form a nearly circular ovoid or substantially annular loop I9 as shown, with the cut edge 20 engaging the concave side of the pen at a distance from the rounded writing surface thus formed. After the point has thus been shaped it may be laterally pushed out of the die I6, the tunnel II and inlet slot I8, both extending through the face 22 of the die block I6 for that purpose. In the operation set forth the steel of the soft pen stock becomes suitably hardened but it is not split due to over-strain as might be the case if the metal were pressed flat or creased.

smoothness of writing comparable with that accomplished by the iridium tip of a gold pen results from the smooth hardened rounded point end which affords a ball-like surface. The scratching and sputtering in writing, due to the catching on the paper fibre of a sharp or cracked edge of metal is thus precluded.

The free extremity of the looped extension being substantially as wide at the contacting inner end as the root of the loop, the said loop is strong and not too flexible and has the desired wearing and writing properties. Yet the pen is not too stili, since the forward end of the slit I5 will separate as will the loop elements I8 at opposite sides of said slit under writing pressure.

While the lateral edges of the loop may be the raw cut edges of the stock, it is preferred to resort to a final buiiing or tumbling operation which results in rounding off said lateral edges as at 23 and also the edges of said slit as at 24.

In addition to the foregoing advantages the annular loop I9 especially in View of its location at the under face of the pen point affords the advantage of capillarity to retain a drop of ink which contributes to the ease of starting.

As many changes could be made in the above construction and method and many apparently widely different embodiments of this invention could be made without departing from the scope of the claims, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

l. A writing pen comprising a sheet metal body having a concave inner side and a split point with a longitudinal extension reversely extending inwardly towards the concave side of the pen in the form of an open substantially circular loop to form a rounded writing point.

2. A writing pen comprising a sheet metal body having a concave inner side and a split point with a split longitudinal extension at its outer end of substantially uniform width reversely extending inwardly towards the concave side of the pen in the shape of an open loop and serving as a rounded writing point.

3. A writing pen comprising a sheet metal body having a concave inner side and a split point with a split longitudinal extension at its outer end of substantially uniform width reversely extending inwardly towards the concave side of the pen as a substantially annular loop constituting a rounded writing point the outer end of said extension being in engagement with the concave side of the pen.

4. A writing pen comprising a sheet metal body transversely curved and aording a generally triangular point, said sheet having a unitary longitudinal extension at its point of substantially uniform Width and reversely extending inwardly for half a turn towards the concave side of the pen as a substantially annular loop, the outer end of said extension being in engagement with the concave side of the pen and the lateral edges of said loop being rounded.

WILLIAM T. HAMER.

Images