US1221786A - Drawing implement. - Google Patents

Description

F. A. ALTENEDER.

DRAWING IMPLEMENT.

APPLICATION FILED MAY 3. 19l'6.

m Patented Apr. 3,1917.

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IEEILIJINAND A. ALTENEIDER, 0F GLENSIDE, PENNSYLVANIA.

DRAWING IMPLEMENT.

Specification of Letters Patent.

Patented Apr. 3, I917.

Application filed May 3, 1916. Seria1 No. 95,283.

To all whom it may concern.

Be it known that I, FERDINAND A. AL- TENEDER, a citizen of the United States, residing at Glenside, in the State of Pennsylvania, have invented a certain new and useful Improvement in Drawing Implements, whereof the following is a specification, reference being had to the accompanying drawings. I

My invention relates to implements of the class including T-squares, triangles, ship and railway curves, irregular scrolls, etc., formed of celluloid or other translucent or transparent material having an edge of straight or curved contour adapted to serve as a guide for a pencil or pen point in linear drawing, and is an improvement upon my invention described in Letters Patent of the United States No. 697,594 dated April 15, 1902 wherein I disclose such an implement having the entire extent of its guiding edges rendered opaque by channeling or recessing each edge, throughout its length, and securing an opaque substance therein. Such channels may be readily formed by a broaching tool caused to traverse each edge from end to end thereof. However, in a triangle, or other implement where two such guidlng edges meet in acute angular or other transverse relation, the points thus formed (and which are subjected to greater stresses in use than the other portions of the implement,)

are relatively weaker than the rest of the implement so that the side walls of the channels at such points may readily be accidentally split apart, for instance, if the implement is dropped upon such a point. Moreover, in said Letters Patent I showed channels having right angular corners at their inner sides, but have since found that such corners permit the walls of the channels to be broken off under much less strain than if the channels have no such corners but are rounded at their inner sides.

- Therefore, it is the object and effect of my present invention to avoid the disadvantages aforesaid, and, accordingly, my present invention includes the provision of a channel in the guiding edge of such an implement which terminates short of the ends of said edge; leaving the ends of said edge transparent and solidly homogeneous and therefore capable of resisting such stresses as would split the ends of the prior structure. Moreover, I prefer to employ a rotary cutter in forming such a channel so as to leave the channel tapering, in an arcual curve, at each end, from its inner to its outer side.

My invention includes the various novel features of construction and arrangement hereinafter more definitely specified.

In said drawing; Figure I is a plan view of a triangle embodying my invention.

Fig. II is a fragmentary sectional. view taken on the line II in Fig. I.

Fig. III is a sectional view similar to Fig. II but showing modified means for rendering the guiding edge opaque.

Fig. IV is a fragmentary perspective view of the upper point of the triangle shown in the latter to pressure, as by dropping or striking it.

.In said figures; 1 is the implement body of transparent material having opposite plane faces 2 and 3 with the guiding edge or edges 4. Said guiding edges are rendered opaque to the extent indicated in Fig. I by any convenient means attached to said body 1.

In the form of my invention shown in Fig. II; said body 1 has the open channel or recess 5 extending betwen said plane surfaces 2 and 3, parallel therewith and also parallel with said guiding edge 4:. Said recess being coated with a layer of black varnish 6, the effect is to render said guiding edge lopaque to the extent of said recess. In the form of my invention shown in Fig. III the recess 5 is filled with an opaque substance 7, which presents a solid front along the edge 4-. In either case, as said recesses 5 terminate short of each end of each of said edges 4, said body 1 is notonly solidly homogeneous at the ends of said edges, as best shown in Fig. IV, but said ends are transparent, as indicated in Fig. I, so that lines upon the surface of the drawing, approximating said edge, may be observed through the latter, at said ends.

Although such channels or recesses 5 may be formed in any convenient manner, provided that they terminate short of the ends of the edges 4:, as above described; I prefer to form them with a rotary cutter havinga rounded edge of the configuration of said channels outlined in Figs. II and HI; whereby said channels are not only left taporing, in an arcual curve, at each end, from their inner to their outer sides, as indicated in Fig. I, but their inner sides are rounded so as to avoid the sharp corners 8 characteristic of the structure illustrated in my Let- Copies of this patent may be obtained for ters Patent aforesaid and which is shown in Fig. V in this case. Of course, terminating said channels short of the ends of the edges 1-, (whether rounded at their inner sides or not) precludes such deformation as abore contemplated with reference to the prior structure, which is indicated in Fig. V; wherein the points 9 of the implement body 10, primarily divided by the channels 11 extending to the ends thereof, have been separated and deformed by dropping the implement upon the point shown.

Implements constructed as above described, possess all of the advantages of those which are transparent throughout their breadth in'enabling the draftsman to observe drawings through them,-the opaque edges, contrasting sharply with the drawing surface, facilitating the adjustment of the implements to the existing lines of the drawings. Although such adjustment was facilitated by the construction and arrangement shown in my Letters Patent aforesaid, the present improvement affords the advantages of not only leaving the implement more durable at its points but of permitting observation of the drawing throu h the points and thus facilitating adjustment of the latter to marks upon the drawings.

Although I prefer to form such implements of material which is not only translucent but flexible, as celluloid or similar compounds, I do not desire to limit myself to such material. Moreover, I do not desire to limit myself to the precise form or method of construction of my invention herein set forth as it is obvious that various mod1fications may be made therein without departopaque substance secured in said channel;

7 whereby said body is solidly homogeneous at the ends of said edge, and said edge is transparent at its ends and opaque intermediate thereof, throughout the extent of said channel.

2. An implement of the class described, comprising a body of transparent material ha ing opposite parallel plane surfaces with guiding edge and having a longitudinal channel extending parallel with said edge and intermediate of said plane surfaces, but terminating short of each end thereof; said recess tapering, in an arcual curve, at each end, from its inner to its outer side; and an ing a guiding edge and a recess in said guiding edge, terminating short of each end thereof; and an opaque substance secured in said recess.

An implement of the class described, comprising a transparent body having a guiding edge and a recess in said guiding edge, terminating short of each end thereof, and tapered at each end, and an opaque substance secured in said recess.

6. An implement of the class described, comprising a transparent body having a guiding edge and a recess in said guidiiw edge, terminating short of each end thereof; and an opaque .substance secured in said recess.

7. An implement of the class described, comprising a transparent body having a guiding edge, of uniform thickness which is transparent at its ends but opaque intermediate of said ends.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsyl- Vania, this twentieth day of April, 1916.

FERDINAND A. ALTENEDER.

Witnesses:

ARTHUR E. PAIGE, ANNA ISRAELVITZ.

five cents each, by addressing the Commissioner of Patents, Washington, I). C.

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