US1288412A - Beam-compass. - Google Patents

Description

G. 3. HILL.

BEAM COMPASS.

APPLICATION FILED JULY 191s,

1,288,4 1 2 Patented Dec. 17, 1918.

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GILBERT J. HILL, on NEW YORK, N. Y.

BEAM-COMPASS.

To all whom it may concern.-

of New York, have invented certain new and useful Improvements in Beam-Compasses, of which the following is a speclfication.

This invention relates to beam compasses.

1 More particularly, itbelongs intheclass with those drawing implements of like general" structure, which are intended to inscribe circumferential curved lines, or to be employed as a measure, or as a straight line ruler, or for gaging the thickness of a body or its diametrical measure.

The object of this invention is the production of an instrument falling within the classor type stated, of which the combined parts are of special construction and are arranged in a particular manner one with regard to another. It is intended that this invention shall be manufactured in such size as to be easily carried in the pocket, and it is believed that the peculiar structure hereinafter described and illustrated in the accompanying drawings makes a strong, durable, accurate and convenient appliance for the purposes sought.

Of the drawings, Figure 1 represents a side view of all the parts assembled, showing the invention ready for use with a lead pencil. Fig. 2 is a top plan View of the parts shown in Fig. 1. Fig. 3 is a side view of this invention showing all parts assembled, and having an ordinary drawing pen held in the pencil holder. Fig. a is a vertical section of the movable beam in its holder, the section being taken upon the line H of. Fig. 2.

Throughout the following description and the drawings the same letter is employed to refer to the same part.

Considering the drawings, it will be noted that the beam A has a semicylindrical, hollow raised portion a running lengthwise along the middle of the beam. This raised portion not only stiii'ens the beam, but it has another function of resisting any side wise displacement of the beam, as will be further explained. At one end the beam has the transverse pencil holder B, which contains the pencil b in Fig. 1.

The member for holding the graduated beam A and for guiding the same when moved lengthwise, comprises several features. It has a downwardly extending por-' Specification of Letters Patent.

Patented Dec. 17, 1918.

Application filed. July 1, 1918. Serial No. 242,766.

tion orleg C, a body portion of which the side edges D and d are' turned over and inwardly leaving a longitudinal space beeween them, a cylindrical, knurled finger piece E projecting upwardly from the holder, and a set-screw socket c for the usual 1 needle point F.

hile this invention as illustrated in Fig. 1 shows a lead pencil b appliedthereto, an ordinary drawing pen G may be held in the holder B, by the simple expedient of Wrapping a strip of paper g around the lower part of the pen until the cylinder thus formed is suiiicient to be properly grasped by the elastic sides or fingers of the pencil holder B. Other means of holding the pen may clearly be employed.

In explaining the operation of this invention, attention is called to the fact that the inwardly turned edges 1) and d of the beam holder engage the side edges of the beam A. The beam is in that manner guided in its movement lengthwise, and it is additionally held against lateral displacement by the arrangement of the hollow raised portion a of the beam between the inwardly turned edges of the beam holder. It will be observed also that the needle point F is alined with the edge of the holder that lies transversely upon the beam and acts as a pointer upon the beam, enabling the user to ascertain the measure of the radius of the circle to be described, and indicated by the figures upon the beam. The beam illustrated is graduated in inches, but, any unit of measure may obviously be used on either side, or upon both sides, of the beam A.

Considering Fig. 2, it will be noted that i the finger piece E and the pencil holder B project mostly upon one side of the holder and beam. That construction permits this invention to lie flat upon any surface, in order that a straight line may be drawn along the beam, when sufficiently exposed for the purpose or along the edge I) of the beam holder. The thickness of an object, or the diameter of a round body, may be measured by placing the same between the finger piece E and the pencil holder B, as will be readily understood.

Having now described this invention, and explained the mode of its operation, what I claim is 1. In a beam compass, the combination with a body portion, of a longitudinally movable beam, the said body portion having projecting side edges arranged contiguous to the side edges of the beam for guiding the movement of the beam longitudinally, and the said beam having a raised middle portion extending for a distance lengthwise of the beam and in movable contact with the said edges of the body portion whereby latoral movements of the beam are prevented.

In a beam compass, the combination with a beam holder having its edges turned inwardly leaving a space lengthwise between them, of a graduated beam having its side edges in engagement with the said inwardly turned edges of the holder, the said beam having araised portion extending lengthwise thereof and movably fitting the Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

said space between the said inwardly turned edges of the said holder of the beam.

3. In a beam compass, the combination with a beam holder having its edges turned inwardly leaving a space lengthwise between them, of a graduated beam having its side edges in engagement with the said inwardly turned edges of the holder, the said beam having a hollow raised portion ex- I tending longitudinally of the middle of the beam and movably fitting the said space between the said inwardly turned edges of the said holder of the beam.

In testimony whereof I aflix my signature.

GILBERT J. HILL.

Washington, D. G.

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