US1188900A - Device for describing ovals and circles. - Google Patents

Description

C. A. CLOGSTON & F. KONRAD/ DEVICE FOR DESCRIBING OVALS AND CIRCLES. APPLICATION FILED JUNE 22. 1915.

1 1 88,900 Patented June 27, 1916.

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C. A. CLOGSTON & F. KONRAD DEVICE FOR DESCRIBING OVALS ANDECIRCLES. APPLICATION FILED JUNE 22. 1915.

1,1 88,900. Patented June 27, 1916.

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CARL A. CLOGSTON AND FERDINAND KONRAD, OF PORTLAND, OREGON.

DEVICE FOR DESCRIBING OVALS AND CIRCLES.

Specification of Letters Patent.

Patented June 27, 1916.

Application filed June 22, 1915. Serial No. 35,578.

To all @uhom it may concern:

Be it known that we, CARL A. CLoesToN 1 and FERDINAND KONRAD, citizens of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented certain new and useful Improvements in Devices for Describing Ovals and Circles, of which the following is a specification.

This invention relates to an improved instrument for forming circles and ovals and the principal object of the invention is to provide a device which can be releasably connected with the pencil and which is provided with an improved device for holding a string so that the string may be let out the desired amount and then releasably held in the adjusted position.

Another object of the invention is to so construct the device as to permit the outer sleeve forming part of the same to rotate and thus cause the circle or oval to be perfcctly formed.

Another object of the invention is to provide a device which will be very simple in construction and which can be cheaply produced.

This invention is illustrated in the accompanying drawings, wherein Figure 1 is a perspective view showing the device in operation. Fig. 2 is a perspective view showing the device in operation but in a different position from that shown in Fig. 1. Fig. 8 is an enlarged view showing the pencil in elevation and the attachment in longitudinal section. Fig. 4 is a perspective view of the inner sleeve forming the body portion of the device. Fig. 5 is a perspective view of the outer sleeve which is rotatably mounted upon the inner sleeve. Fig. 6 is a perspective view of the frame which is connected with the outer sleeve and carries the roller. Fig. 7 is a perspective view of the sleeve which tends to prevent the roller from rotating. Fig. 8 is a perspective view of the roller. Fig. 9 is a perspective view of the collar which clamps the inner sleeve or body portion to the pencil.

The inner sleeve or body portion 10 of this device fits upon the pencil 11 and is provided with a longitudinally extending slot 12 leading from its upper edge thus providing jaws each of which is provided with a stamped out portion forming a cam 13. The collar 14 is slidably mounted upon the inner sleeve above the abutment head 15 and when moved upwardly will compress thej aws and tightly hold the sleeve 10 in place with the pencil extending beyond the lower end of the sleeve the desired amount.

The outer sleeve 16 is rotatably mounted upon the inner sleeve between the abutment 15 and the lower abutment flange 17 and is thereby permitted to rotate when the instrument is in use, so that the pencil will re main outside the loop of the line when in use. To this sleeve 16 there is secured the frame or housing 18, the securing screw 20 of which passes through the opening 19 and has its inner end screwed into the threaded opening 21 of the sleeve. Therefore the housing will be removably secured by the screw which also serves as an axle for the spool or drum 22. This spool or drum 22 is rotatably mounted upon the axle 20 within the housing or frame and has its heads provided with teeth as shown in Fig. 8 so that the spool may be engaged by the resilient tooth 23 of latch 24 and thus prevented from being rotated by drawing upon the line or cord 25 wound upon the spool. In other words if it is desired to unwind the line or cord 25 it is necessary to grasp the heads of the spool with the fingers and rotate the spool while removing the line. This line 25 when put in place is doubled and has its ends connected with the spool and then wound thereon so that when unwinding the line the looped end shown in Figs. 1 and 2 will be provided. This looped end passes through the'opening 26 in the arm 27 of the frame and also passes through the openings 28 so that when the device is not in use, the extent to which the line can be wound upon the drum will be limited and thus the line left where it can be easily reached when desired. It will thus be seen that this line is so put in place as to permit of it being readily engaged when desired.

In the operation of this device the push pins 29 will be first put in place upon the papers whereon it is desired to draw the oval and the line 25 will then be drawn out the desired distance and placed about the pins as shown in Figs. 1 and 2. The pencil point is now brought to bear upon the paper and the oval can be easily drawn by simply moving the pencil across the paper. If it is desired to form a circle only one of the push pins 29 will be used so that the pencil will be the same distance from the pin during the entire marking operation.

noted that with this device the size of the circle or oval can be regulated and either a small or a large oval formed. It should be further noted that the proportions of the oval can be varied by varying the positions of the push pins and the length of the string.

Whatis claimed is 1. A- drafting instrument comprising a body portion, a sleeve rotatably mounted upon said body portion, a housing carried by said sleeve and provided with an arm extending beneath the lower end of said body portion; and having its lower end portion provided withan upper opening and with a pair of lower openings, a drum rotatably mounted in said housing, means engaging said drum for releasably holding the same in a set position, and a line having its end passing through the lower openings of said arm and being then passed through the upper opening and Wound upon said drum.

2. A drafting instrument comprising a body portion, a sleeve rotatably mounted upon said body'portion, a housing carried by 1 said sleeve, a drumrotatably mounted in said housing, and a line having its ends connected with and wound upon said drum.

3. A drafting implement comprising a body portion, a sleeve rotatably mounted v\ i v thereon, a drum rotatably connected with said sleeve, a linehaving its end portions wound upon said drum to permit the line to be Withdrawn from the drum in the form of a loop, and guiding means for connecting said line with a surface to have an oval mark thereon. V

4. A drafting implement comprising a body portion, a sleeve carried by said body portion, a housing, carried by said sleeve, a drum rotatably mounted in said housing, a

latch formedof a strip of resilient material connected with said housing and having its free end portion engaging said drum to re-.

leasably hold the drum in a set position, and a linewound upon said drum 5. A drafting implement comprising a body portion, a sleeve rotatably mounted thereon, a drum rotatably connected with said sleeve, and, a line Wound upon said drum. V V

6. A drafting implement comprising a body portion, a sleeve rotatably mounted upon said body portion, a drum'rotatably 1;

connectedwith said sleeve, and a line doubled and having its'free ends wound upon said drum. g

In testimony whereof we affix ourtures in presence of two witnesses.

- CARL A. CLOGSTON. r

, vFERDINAND KONRAD. Witnesses:

JoHN S. GERRY, IMANU'EL' B. PALACIOS; I

flopiel of this patent may he obtained for 11V: cents each, hy addressing the Commissioner or ratenb Washington, D. 0.

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