US647867A - Drawing implement. - Google Patents

Description

l(No Model.)

AQ L. PATTERSON. DRAWING IM'PLEMENT.

(Application led Feb. 19, 1900.)

Patnted Apr. 17, |900.

/NV f5" ,"1/11/ l,

EWMEYS VNITED STATES PATENT OFFICE.

ARTHUR LOW PATTERSON, OF CHINA GROVE, NORTH CAROLINA.

DRAWING llVIPLEM ENT.

SPECIFICATION forming part of Letters Patent N o. 647,867, dated April 17, `1900. Application filed February 19,1900. Serial NO- 5,729. (No model.)

To all wiz/om it may concern:

Beit known that I, ARTHUR Low PATTER- SON, a citizen of the United States, residing at China Grove, in the county of Rowan and State of North Carolina, have invented a new and Improved Drawing Implement, of which the following is a full, clear, and exact description.

My invention relates to drawing implements,and has for its obj ect to provide a simple and inexpensive means for drawing ellipses. To this end I provide the attachments fully described hereinafter,and specifically defined in the claims. 4

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a perspective View illustrating the application of my invention. Fig. 2 is a plan showing a ruler with my attachment applied thereto. Figs. 3 and 4t are end views of the two clips employed in connection With the ruler. Fig. 5 is anend elevation ot' a rulingpen provided with my attachment, the attachment being shown in section. Fig. 6 is a face view of the attachment shown in Fig. 5, and Fig. 7 is a face view of another form of the said attachment.

In carrying out my inventionl employ two clips adapted to be secured to a ruler. One of the clips A is provided at its lower end with a projecting portion A', having a return portion A2 above it, said return portion being slitted, as at A3. The two portions A A2 form a clamp for a cord or string B, which is passed between the members A' A2 and out through the slit A3, as shown in Fig. 2, the endwise movement of the string being prevented by tying a knot B in it. The clip A lits upon a ruler C, for instance, of triangular form, as shown, and the clamp A A2 projects from the edge of the said ruler. The other clip D has at one side a portion D, projecting to the same extent as the portion A' and having a return-lip D2, slotted at D3. Toward the otherend of the clip D extends a turned-up portion D4, forming a clamp, but not projecting so far from the body of the clip as the lip D2.V On the other side of the ruler the clip D is provided with a thumb-piece D5. The string B is first passed through the slit D3 of the lip D2 and then through the longitudinal clamp formed by the turned-up portion D4.

The string B is adapted to form the guide for an attachment on the ruling-pen E. This pen maybe of any usual type, and the attachment consists of a plate F of suitable formation to tit one of the members of the ruling-pen and provided at its bottom with a passage-way F for the s tring B. This passage-way is preferably formed by bending up the end of the attachment-plate F to form a hook F2. This attachment-plate is secured to the ruling-pen by means of a thumb-screw E and is adjustable thereon, the screw passing for this purpose either through a vertical slot F3 in the attachment-plate, as shown in Figs. 5 and 6, or through one of a series of superposed holes F4, as shown in Fig. 7.

The manner of using the implement is clearly shown in Fig. l. The clips A and D are set according to the scale on the ruler, each clip indicating one of the foci of the ellipse. The string is then secured to the clips in the manner hereinbefore described and is also passed through the hook F2 of` the attachment-plate of the ruling-pen, and the cllipse may then be drawn in the usual inanner. It will be observed that since the points at which the string B is fastened-that is, the slits A3 and DS-are somewhat in advance of the corresponding edge of the clips A D the ellipse or, rather, the half-ellipse can be drawn very accurately even to the ends of the greatest diameter. what above the paper or drawing surface and not in contact with it, the resistance to the movement of the implement is reduced and the danger of blurring the lines is avoided. The vertical adj ustability of the plate F is of advantage, since in drawing a large ellipse it will be advisable to raise the attachment-plate F to compensate for the greater amount of sagging in the string. Furthermore, this adjustability allows the plate F to be used with ruling-pens of various sizes.

The implement is simple and compact, and even small ellipses can be readily drawn with it, as the clips A andD have the string-clamping devices at their adjacent ends and can be moved closely together. The clip A isgen- As the string B is held some-V IOO erally stationary, and the draftsman with his left hand can readily adjust the string B and clamp, aruling-pen and a plate adapted .for

attachment to the ruling-pen and provided with a passage-way forl the string.

2. A drawing implement', comprising a string, a ruler, two clips adapted to'be slipped on the ruler and each provided with a stringclamp projecting from the edge of the`clitp,a

ruling-pen and a plate adapted for attachment to the ruling-pen and provided with va passagewaj7 for the string.

3. A drawing implemen-t, comprising a.'

string, a ruler, two clips adapted to be slipped on the ruler and each provided with a stringclamp projecting fromthe edge of the clip the same distance'as the clamp .of the other clip, one of the clips being further provided with an additional string-clamp arranged inwardly with reference to the first named clamp, a ruling-pen and a plate adapted for attachment to the ruling-pen and provided with a passage-way for the string.

4. A drawingimplement, comprising av string, a ruler, two clips adapted to be slipped on the ruler and each` provided with a stringclamp projecting from the edge of the clip the same distance as the clamp of the other clip, one of the clips being further provided with an additional string-clamp arranged inwardly vwith reference to the first named clamp, and with a projection o r thumb-piece located on the other side of the clip, a rulingpen and a plate adapted for attachment to the ruling-pen and provided with a passage- Way for the string. l

5.v A drawing implement, comprising a string, a ruler, two clips'adapted to be slipped on the ruler and each provided with a stringholding devi'ce,a ruling-pen and a plate adapted for attachment to the ruling-pen and provided atits lower end with a hook forming a passage-way for the string.

6.k A .drawing implement, comprising a string, a ruler, two clipsadapted to be slipped on the ruler and each provided with'astringholding device,a ruling-pen and a plate adapt- Ved for attachment to the ruling-pen and provided with a passage-way for the string, said plate havin g means for adj nsting it vertically.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR LOW PATTERSON.

1 Witnesses: l

T. D. CAsTo, G. M. DUVAL.

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