US1449271A - Drawing implement - Google Patents

Description

Mar. 20, 1923. 1,449,271.

1. F. ELLloTT.

DRAWING IMPLEMENT.

FILED APR. 15.1922.

:Encanto/L mm @g I WMM l liti datenterll Maro 20, llQg.,

DRAWING IMPLEMENT.

Appneatiqn sled aprn 15, 192e. serial No. 552mg.

To all whom t may concern:

Be it known that I, JAMES F. ELLIOTT, a citizen of the United States, residing at Kellerman, in the county of Tuscaloosa and State of Alabama, have invented new and useful Improvements in Drawing Implements, of which the following is a specification.

This invention comprehends the provision et a drawing implement designed to draw circles ot any desired radius, and is intended to be used in the place of dividers or compasses now in general use.

More specifically stated7 the invention con templates the provision ot an instrument of the above mentioned character including a short post provided with means Jfor supporting a pencil supporter which is adjustable radially from the post to determine the radius of the circle to be drawn, the post being equipped with means for rotating the latter, incident to pressure exerted downwardly upon the top of the post.

The nature and advantages of the invention will be better understood when the following detailed description is read in connection with the accompanying drawing, the invention residing in the construction, coinbination, and arrangement of parts as claimed.

ln the drawing forming part of this application, like numerals of reference indicate similar parts in the several views`r and wherein Figure l is a view in elevation of the instrument forming the subject matter of the invention.

Figure 2 is a sectional view taken on line Q-Q of Figure 1.

Figure 3 is a fragmentary sectional view taken through the post and its associated cap.

Figure 4- is a sectional view taken on line 4.-4 of Figure 2.

Referring to the drawing in detail.` 10 indicates a short post which is tapered at one end to define a point, and slidable on this post is an arm 1l. which projects laterally from the post. and this arm is longitudinally slotted as at 12. 13 indicates the arm slide which is arranged longitudinally of the post 'i0 as shown: Attached to the post and eX`1 erting a downward pressure upon the arm 1l are coiled springs 14, the purpose of which will be hereinafter described. Arranged parallel with the post 10 is a pencil holder l5 which may be of any suitable construction, and this holder slides through the slot 12 of the arm, being of course movable toward and away from the post to any desired position, depending upon the size of the circle to be drawn. The arm is graduated as at 16, indicating different radii, so that the lpencil holder can be conveniently shifted to its proper position and subsequently held fixed relatively to the arm through the instrumentality of a set screw 17.

rlhe upper end of the post 10 is threaded as at 18, the threads being arranged at the desired pitch for the purpose of rotating the post incident to the depression of the cap 19. This cap is arranged upon the upper end of the post and is grooved to accommodate the threads 18, so that when the cap is depressed. the short post is given one complete revolution. interposed between the top of the post and the cap 19 is a coiled spring 2O which serves to hold the cap normally elevated. and the cap is of course depressed against the tension of this spring.

In practice, the pointed extremity of the post 10 is placed upon the paper or other obiect to be drawn upon, and the pencil. holder subsequently adjusted to the desired radius. The cap 19 is then depressed in the manner above described, causing the short' post to make one complete revolution in drawing a circle` inasmuch as the arm and pencil holder are rotated with said post. When the cap is released, or in other words pressure removed therefrom, the spring Vfunctions to return the cap to normal position. The arm is as above stated, slidable on the post 10 and is held depressed by means of the spring, which permits the beam to giveslightlv when the post leans to one side or the other in making a circle. .thus preventing the pencil from tearing the paper. simple in construction and can be convenientlv manipulated for the purpose intended.

While it is believed that from the foregoing description. the nature and advantages of the invention will be readily apiw The instrument in its entirety is very parent, I desire to have it understood that I do not limit myself to what is'herein shown and described, and that such changes may be resorted to when desired as fall Within the scope of what is claimed.

l. A drawing instrument of the character described comprising a short post, f1-graduated arm slidable on the post and projecting laterally therefrom, said arm being slotted, a pencil holder movable through said slot, a set screw holding saidholder Jlined-relatively to the arm in a given position7 yieldable'mean's associated with said post and eX- erting a downward*pressure on said arm, a

-cap slidable on 'the upper end of the post, yieldable meansinterposed between the post and said cap, and means whereby the post is rotated incident t0 the depression "of the cap.

2. A drawing instrument of the character described comprising a short post7 a spiral thread about the upper end of the post, a cap slidable on the post and havingrgrooves receiving said threads, whereby said post is rotated incident `-to the depression-oitl the cap, a yieldable element interposed between theipost and cap, an arin slidable `on the post and projecting laterally therefrom, said arm being'zgraduatedra pencil holder adjustable longitudinally of the arm.. and means for retaining said holder fixed relatively rto the arm in a given position.

In' testimony whereof I affix my signature.

JAMES VF. ELLOTT.

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