US418967A - Triangular rule - Google Patents

Description

Patented Jan. 7, 1890.

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TRIANGULAR RULE.

(MMM) F. BBNZINGBR au H. E'. GRABAU.

WTVESSES.'

@www W UNITED STATES PATENT OFFICE.

FREDERICK BENZINGER, OE NE\V YORK, N. Y., AND HANS EDGAR GRABAU,

l OF I-IOBOKEN, NEW JERSEY.

TRIANGULAR RULE.

SPECIFICATION forming part of Letters Patent No. 418,967, dated January 7, 1890.

Application filed September 26, 1889. Serial No. 325,202. (No model.)

To @ZZ whom it may concern:

Be it known that we, FREDERICK BENZING- ER, of the city, county, and State of New York, a citizen of the United States, and HANS EDGAR GRABAU, of Hoboken, in the county of Hudson aud State of New Jersey, a citizen of the German Empire, have invented certain new and useful Improvements in Rules, ot which the following is a specification.

1o This invention relates to improvements in the rules of triangular cross-section, such as are used by draftsmen, engineers, architects, &c. These rules are usually made of boxwood, which is very light and very apt to warp,

especially if the scale is of considerable len gth.

The object of our invention is to provide a rule of this kind which is weighted, so as to be heavier than the ordinary7 box-wood rule.

The further object of our invention is to 2o prevent the warping of the rule, and another object of our invention is to provide an indicator which shows which scale on the rule is being used.

The invention consists in a draftsmans rule 2 5 of triangular cross-section, provided with a reentorcing tube or rod extending lengthwise through the same for the purpose of weighting the scale, and also to provide against warping and bending.

3o rlhe invention Jfurther consists in the combination, with an indicator provided at the end of the rule and which can be adjusted to point to any one, of the scales on the rule.

The invention also consists in the construc- 3 5 tion and combination of parts and details, as will be fully described hereinafter, and finally pointed out in the claims.

In the accompanying drawings, Figure l is a face View of our improved draftsmans rule,

4o parts being broken out and others shown in longitudinal section. Fig. 2 is a transverse sectional view of the same on the line Ei g. I. Fig. 3 is a similar transverse sectional View showing a modication.

Similar letters of reference indicate corre' sponding parts.

The rule A, which is preferably made of boxwood, but can be made of other suitable material in cross section, has the shape of an equilateral triangle, and on each side is pro- 5o vided with two graduated scales-one at each edge of each side-in the usual manner. The rule is provided with a central longitudinal bore B, in which a metal tube O is inserted, said tube serving toincrease the weight of the rule, and also serving to prevent bending and warping. In. place of the tube, a rod D may be inserted in the bore B, as shown in Fig. 3. A cylindrical piece E is inserted in one end of the tube O in such a manner that it can turn 6o in the same, and on the end of said piece E the indicator E is hinged. Then thehinged pieces E and F are swung in line, they both can be inserted into the tube B, so as to be out of the way.

When the rule is being used, the piece F is drawn out sufficiently to permit of its being swung upward, and then it and the piece E in the tube O are so turned that said piece F rests against or is adjacent to the end of that 7o scale that is being used, so that if by accident the rule is overturned or placed in another position the draftsman can at once tell which of the scales he has been using.

Having thus described our invention, we claim as new and desire to secure by Letters Patentl. A draftslnans rule made triangular in cross-section and provided with a longitudinal metal tubular filling-piece surrounded by 8o the material of which the rule is made, substantially as setforth.`

2. The combination, with a drattsmans rule having an aperture in the end, of a plug adapted to be inserted in said aperture and 8 5 an indicator hinged to said plug, substantially as set forth.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing Witnesses;

'itnesses:

OSCAR F. GUNZ, INI. REIMHERR.

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