US798721A - Rule. - Google Patents

Description

PATENTED SEPT. 5, 1905.

LIA. WILSON.

RULE APPLICATION FILED HAB.24,1905.

- Qnveml'cz wanna w I suitabi :means for determining the angle of ad ust rent of the head with relation to the UNITED SlAiT ES PATEXT. ()FFICE.

LEWIS A. WYHASUN, ()F :\"()lt'llll*]ASl HARBOR, MAINE.

Maine,

mg is specification.

This invention relates to imprm'ements in T-s uruxe rules of that type embodying, essentially, :1. rule having an adjustable head with rule.

The invention resides, essentially, in the provision of a device of novel construction whereby, the length of the rule may be extended, so that the same will be equalized for large" or smaller work, according to various conditions arising in actual use.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for etiecting the result reference is to be had to the following description and accompanving drawings.

While the invention may be adapted to different forms and conditions bychanges in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment is shown on the accompanying drawings, in which Figure l is a plan view of a rule embodying the invention, the adjustable section thereof being extended a shortdistance. Fig. 2 is a transverse sectional view on the line 2 of Fig. 1, showing more clearly the connection between the sections of the rule. Fig. 3 is a broken perspective view, the adjustable rulescctions being shown partly projected from the lmdy-section.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

eferring to the drawings, the letter A designatesthe rule, and the letter B the head thereof, the two forming an ordinary T- square. The rule A is pivotally secured to the head B, a suitable set-screw 1 being provided to secure the parts together and admit of adjustment of the parts at a predeter-,

mined angle with relation to each other. The upper side of the head B is provided with a suitable arc-scale 2, with which a pointer 3, carried by the adjacent end of the rule A, is

Specification of Letters Patent. Applicatiuu filcdMarch 24,

Patented Sept. 5, 1905. 1905. Serial No, 251,851.

l adapted to cooperate to indicate the angle of adjustment of the rule to the head.

The rule A consists of a relativelystationary body-scctigm & and adjustable sliding sections 5 at opposite longitudinal edges thereof and peculiarly attached to the body 4. The secment at the opposite sides of the body 4, and I the said sections, as well as the body, are prol vided with sealeauarks, which may beinches, centimeters, or any other suitable scale measuremen ts, the parts i and 5 having the edge portions in alinement. Thus when the sections 5 by slidable movement are projected from the body 4 said sections will form a continuation of the ruling edges of the body, so that ,l lines of greater length may be made in the l customary manner. I I wardly from the sections 5 at a point he- I tween the ends thereof and forms a finge 1' piece for each section, as will be readily apparent.

The construction of the body 4 and the sections 5 is peculiar in order to form an interlocking connection between these parts which will be substantial and practical. Since each of 5 is mounted in the same manner,

Projecting rearthe sections only one will be described.

wardly from a longitudinal edge of the section l 5 is a flange 7, the upper side of which is pro- 1 vided with a longitudinal groove 8. This I flange is received in a recess 9 in a side of the l ruler A, said recess being provided longitudi nally thereof with a downwardlycxtending l rib or tongue 10. The tongue 10 is received in the groove 8 of the flange 7, so that the I flange 7 forms an interlocking connection between the body of the section 5 and the body l 4 of the ruler. admitting, however, of free slidable moven ent of the section 5, in order I to adjust the same and increase the length of the ruling device, as above premised. A longitudinal tongue 11 projects from the rear side of the body of the section 5, and said tongue operates in a groove or korf 12 in the body-section 4 of the ruler, the groove 12 aforesaid being located just beneath the re l cess 9 above described. The outer side of the F body of each section 5 slants, so as. to form a l beveled edge for the ruler, a conventional and l desirable construction, as will be found in most rulers at present in use.

order to facilitate the formation of the intcr- A lug 6 projects outtions 5 are arranged for longitudinal move'- 1 locking recess, kerfs, and tongues, may be r it made in two parts a and b, said parts a and I) being secured together by screws or finished fastc'nings of-any kind, as most desirable.

An essential feature of the invention is the provision of the mic portions at either side of the part A, the same being divided into convenient scales, in order to be useful and very convenient, and having all the advantages of the scale-rules at present in common use. Further, the device combines the drafting-rule and T-square, andthe draftsmans scale is always before him, saving much time and annoyance in hiswork.

Having thus described the invention, what is claimed as new 'is- A rule of the type described embodying a bodyvsection provided with a recess longitudinally of a side thereof, a relatively movable section having a longitudinal flange projected rearwardly therefrom and formed with Mom gitudinal groove, said flange being received in the recess of the rule-body aforesaid, a longitudinal tongue projecting from a side of the recess in the body-section into the groove of the flange and interlocking therewith, and a longitudinal tongue projecting rearwardly from the movable section, the body-section having a longitudinal groove beneath the l'ongitudinal recess before mentioned to receive the longitudinal tongue of the movablese'etion. 3

In testimony whereof I aflix my signaturein -n presence of two witnesses.

I LEWIS A. WILSON; In. 8.1]

Witnesses: r

ELLEN S. BERRY, CLARENCE G. STANLEY.

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