US289457A - Ohaeles a - Google Patents

Description

(No Model.)

0. A. SHIELDS.

PARALLEL RULER. No. 289,457; r Patented Dec. 4, 1888.

aft 15 5x6 3- UNITED STATES PATENT OFFICE.

PARALLEL RULER.

SPECIFICATIQNforming part of Letters Patent No, 289,457, dated December 4, 1883.

Application filed October 15, 1883. (N model.)

. To aZZ whom it may concern.

Be it known that I, CHARLES A. SHIELDs, a citizen of the United States, residing at 315 A street north-east, Washington city, in the District of Columbia, have invented certain new and useful Improvements in Rulers, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to new and useful improvements in straight, curved, or irregular devices for drawing parallel lines.

The advantage of this invention is readily seen. It enables any one using the ruler, when the indicators are extended, to make lines with greater ease, celerity, and precision than with rulers now in use.

Figure 1 is a perspective view of my device with both forms of indicators as applied to ordinary straight rulers. Fig. 2 is a plan view of the gage or indicator. Fig. 3 is.a vertical section on the line xwthrough Fig. 2.

The same letters refer to similar points on the drawings.

Myinvention consists of a straight, curved, or irregular ruler, M, having embedded in each end and at right angles with the ruling edge a gage or indicating device provided with a movable bar, A, of any desired shape, preferably rectangular, having at its outer end and projecting parallel with the ruling-edge a point or indicator, to. The bar A is contained entirely in the receptacle or box B, which may be made of one ormore pieces, and which has in its top thegroove c, somewhat less in length than the box B. The groove 0 has centrally through its length the longitudinal slot 0. Passing through the slot 0, and fastened permanently to the inner end of the bar A, is the push-piece 0, set vertically in and at right angles to the groove 0, and provided at either or both ends with the angular indicator d and d, referring to a suitable scale on the top of the box B on either or both sides of the groove 0. The bar A fits tightly in the box B, so that when moved to any desired distance in or out it will, by friction or grooves, be retained firmly in position.

Extra extension-indicators (stationary) may be located any desirable distance from the end of the ruler, if required.

As in drawing parallel lines they are somethe top of each end, respectively, of the box B,

and being fastened permanently in the body of the ruler, as shown in Fig. 1.

In practice, when wishing to draw a line or lines parallel with certain designated points, or with another line already drawn, the indicator-rods a at each end, or one end and the.

center lateral indicator, are pushed an equal distance out from the ruler, and then placed on the line first made, and the succeeding lines drawn at the front of the ruler will necessarily be parallel with the first.

My improvements in rulers are so adapted as to be capable of being attached to parallel rulers, triangles, or set squares, Tsquares,

eccentric rulers, curved rulers, serrated or waved-line rulers, railroad curves, irregular and ship curves,and to all other instruments, tools, or articles wherein rapid and accurate ruling or marking is essential or desirable.

What I claim as new, and desire to secure by Letters Patent, is-

1. The sliding extension -indicators embedded in a ruler at its ends, or at any desired point, and running out at right angles thereto, with the case and scales, substantially as described.

2. The combination of the right-angle sliding extension-indicator at each end of the ruler, with center extension-indicator .mov-

ing to the right or to the left, with their cases and scales, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES A. SHIELDS.

Witnesses:

GEORGE W. KEMP, Sr. LEwIsI. ONEAL.

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