US1569938A - Combined paballbl b ule and compass - Google Patents

Description

Jan. 19 1926;

5. G. LE GRESLEY COMBINED PARALLEL RULE AND COMPASS Filed June 12, 1 923 WITNESSES IIYVFNTOR.

v MATTORNEY? Patented Jan. 19, 1926.

ra'rsur QFHCE.

STANLEY G. LE G-BESLEY, OF FLINT, MICHIGAN.

COMBINED PARALLEL RULE AND COMPASS.

Application filed June 1.2, 1923. Serial No. 644,836.

To all whom it may concern:

Be it known that I, STANLEY Gr. Ln (innsmy, a citizen of the United States, residing at Flint, in the county of Genesee and State 5 of Michigan, have invented certain new and useful TIDPIOVGIHGHbS in Combined Parallel Rules and Compasses, of which the following is a specification.

This invention relates to certain new and useful improvements in combined parallel rulers and compasses, particularly useful for assisting silversn iths and engravers for fa cilitating their inscription work and the finding of true centers of large articles.

The primary object of the present inven tion is to generally simplify and improve devicesof the above kind whereby they may meet with the requirements for a successful commercial use.

20 Another object of the invention is to proride means whereby the adjustable point may be moved within a Wide range for efficient operation in compassing articles of various sizes and for drawing parallel lines any desired distance apart.

Vith the above general objects in view,

and others that will become apparent as the nature of the invention is better understood,

the same consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claim.

In the drawings, wherein like reference characters indicate corresponding parts throughout the several views,

Figure 1 is a side elevational view, partly broken away, of a combined parallel rule and compass constructed in accordance with the present invention,

Fig. 2 is a front elevational View of the device-shown in Figure 1, and

Figurefiis an enlarged fragmentary sectional view showing a. detail of the invention.

Referring more in detail to the drawing, the invention embodies a rod 5 of the re quired length and preferably of square cross section, one side of the rod being pro vided with teeth extending from side to side thereof and forming a rack extending from end to end thereof, as at 6.

The rod 5 is provided at one end thereof with a transverse opening in which is suitably iixed, as by riveting or like, a pin 7, the pin 7 being of such length as to project beyond the adjacent edge of the rod 5, as

shown in Figure 3. The projecting end of the pin 7 is provided with a socket, the Walls of which are longiudinally slotted to provide a plurality of yielding clamping jaws 8, the outer surfaces of which are threaded as at 9. A suitable scribing point 10 is adapted for reception within the sock st, and a nut 11 is threaded onto the jaws 8 so as to force the latter inwardly into tight gripping engagement with the inner end of the point 10. This provides means where by the point may be readily renewed from time to time when. the same becomes worn, and also enables the substitution of different forms of points as required in accordance with the various kinds of Work being performed.

A point-carrying slide is movable longitudinally on the rod 5 and embodies a substantially U-shaped member 12 embracing three sides of the rod and projecting beyond the remaining side thereof in a direction parallel with the longitudinal axis of the pin 7. The projecting ends of the legs of the member 12 are connected together by means of a relatively short rod member 13 disposed therebetween, the member 13 having one end projecting beyond the adjacent edge of the member 12 towards the point 10, as shown in Figures 1 and 2, at 14. The projecting end 14 of the member 13 is provided with a cone pin for compass use and having a steel point, as indicated at 15.

A resilient latch member 16 is carried by the side of the member 13 adjacent the rack 6, and this latch member preferably consists in a pivoted catch which is normally spring pressed so that one end of the same, as at 17, normally engages between an adjacent pair of teeth of the rack 6 for holding the slide against movement in any of its adjusted positions. The other end of the catch is enlarged as at 18 to provide a finger piece by means of which the latch may be manually swung for releasing thesame from the rack, whereby the slide may then be moved to any desired adjusted position. The spring for normally swinging the latch member 16 into engagement with the rack 6 is generally denoted by the numeral 19.

From the foregoing description it is believed that the construction and operation as well as the advantages of the present invention, will be readily understood and appre- Ciated by those skilled in the art.

being parallel with the axis of the first men tioned point, and a latch member plvnti'tl upon the sleeve member and having its end portion adapted to ei'igage in the s mees between the teeth of the bar, said end portion when engaged in one of the spaces between the teeth of the bar being disposed in align ment with the axis of the point carried by the sleeve member.

In testimony whereof I ailix my si niitnrn.

STANLEY G. LE GREbIJEY.

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