US1576800A - Combination protractor and compass - Google Patents

Description

March 16 1926. 1 1,576,800

H. TlBoNY COHBINATION PROTRAGTORy AND COMPASS Filed Nov. 2l. 1923 INVENTOR MMA r a ATroRNEY Patented Mar. 16, 1926.

PATENT OFFICE.

HENRY TIBONY, 0F NEW YORK. N. Y. Y

COMBINATION PROTRACTOR AND COMPASS.

Application led November 21, 1923. Serial No. 676,078;

To all whom t may concer/n:

Be it known that I, HENRY I1BoNY, a citizen of the United States, residing at New York city, in the county and State of New York, have invented a new and useful Improvement in a Combination Protractor and Compass, of' which the following is a specifcation.

This invention relates to improvements in a combination protractor and compass, intended for the use of' workers in w-ood or steel, and has for its special object the providing of an instrument which can be accurately and quickly adjusted to any angle or circle desired, and also used in all kinds of shop and drafting work. As is obvious the construction is simple and econoniical and simple to handle with eiciency. Y

These objects are attained by the device shown in the drawings herewith in which z- Fig. 1 is a plan view of my device.

Fig. 2- is a longitudinal sectional view with part of the blade in elevation.

Fig. 3 is an edge view looking from the f top oi Fig. 1.

As shown in the drawings my device consists of a plate 5b, with a rectangular fiange 6b slightly cut away at 15 to provide clearance for the thumb screw 7b by which the blade 8b is pivotally connected to the said plate. The end of the blade 8", which rests upon the plate 5b is tapered ofi' to form afingerlike member adapted to indicate upon the graduated scale of the plate the precise angle at which the blade is disposed toward the plate.

The blade is alsol provided with a longitudinal slot 13 which terminates at its outer end in an enlarged aperture, through which the sli'dable index member 14 may be introduced so that it may travel along the said slot. This member 14 also contains an aperture through which a pencil point or other marker may be inserted, to serve, if' desired, in conjunction with the lower extremity of the screw 7b, as a convenient pair of dividers. The member 14 is made in two parts, the upper being` a knurled nut and the lower a stud with a flange with an opening through the centre through which the index point projects, the upper end of the ystud being threaded for engagement with the knurled nut. The said tapered lowered extremity 11 of the screw 7b could also be utilized to position the center of acircle of which the circumference could be drawn by the marker inserted through the aperture in the slidableA index member 14.

As shown in Figs. 2 and 3 the thumb nut and the pin may be formed separately the lower end 11 of the latter being tapered and the upper end being threaded for engagement with the said thumb nut.,

I claim 2- In a universal gauge; a semi-circular plate having a substantially rectangular fia-nge along the straight edge thereof and the central portion of the plate being depressed below the upper face of the marginal portion;

a blade having a free end, a finger end, a

graduated scale, and a longitudinal slot terminating in an enlarged aperture; an index member slidablyimounted in the said slot` and provided with an opening adapted to receive marking means; and means for pivotally attaching the said blade to the said plate comprising a pin having a tapered lower extremity and a threaded top portion, and a threaded thumb nut adapted to engage with the said top portion of the said pin.

HENRY TIBONY.

Images