US173812A - Improvement in parallel rulers - Google Patents

Description

J. B. PRICE.

PARALLEL RULER. No. 173,812. Patented Feb. 22,1876.

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cameos-mares PATENT OFFICE.

John B. PRICE, OF THOMPSONVILLE, CONNECTICUT.

IMPROVEMENT m PARALLEL RULERS.

" Specification forming part of Letters Ratent No. 1 73,812, dated February 22, 1976; a lication filed January 26, 1876.

To all whom it may concern: 7

Be it known that I, JOHN B. Peron, of Thompsonville, State of Uonnecticuahaveinvented a Hatching-Ruler, of whichthe fol:

lowing is a specification:

My invention consistspin brief, of a ruler clamped between a triangle and friction-wheel upon opposite parallel edges, so that the rotary movement of the wheel on one edge of the ruler shall carry the triangle upon thev other, and so that the movement of the wheel .is intermittently governed and limited by the a swing of a convenient finger-piece to slide the l a triangle the required distance to form the spaces between the hatch-lines; and my improvements further relate to the peculiar construction and arrangement of the parts for giving the. proper motionto the triangle, and for providing for its reversal of direction.

In the drawings, Figure I is a plan view of e the complete apparatus. Fig. 11 is a reverse view with the ruler removed. Fig. III is a side view with the ruler in section. Fig. 1V

is a vertical section, and Figs. V, VI, and VII are detail views. a

The triangle B has one of its sides brought against the edge of the ruler D by the frame sides at d, which, passing over the ruler, are

and one edge of the triangle that the ruler is inclos'ed. Arranged in a protecting barrel, 0, from the frame, is the friction-wheel E in the same plane as the ruler and triangle, and having its rim, as shown in Fig. 11, to slightly project beyond the surface 0 to engage with the edge of the ruler to, by its rotat on, move the frame with the triangle over the ruler held upon the paper. The. rotation of wheel E is .eifected by means of the lever F in convenient reach of the finger when operating the device, and which piece F has its shank secured to a stem, g, from the wheel E, while itsi'urther end is bent down to swing between and be stopped by the sides d d.

a It is evidentthat were the wheel E rigidly connected to the lever finger-piece F, the

struct the wheel E in sections, so thatwhen p the piece F is swung in one direction its friction-surface; moves against the ruler, while, in the other, the inner section of the wheel moves independently, to be again clutched with the friction part, to' enable the swing of theileverF to move the triangle in one direction only. I

This 1 accomplish as follows: The frictionwhee] is made in the form of an annular sec- 4 tion, as shown in Fig-IV, inclosing a' piece,

a, provided with the stem g, to which the lever F is attached, the part a is pared away on its perimeter, as seenin Fig. V, to acalnshape to leave a crescent-shaped space between the part a and inner wall of section E for the reception of a vertical pin, 3 which, being held from the part a, forms a clutch tounite the part a and annular section E at one part of a the rotation of part a, but releases them at the reverse. The part a is horizontally slotted past its axis to provide space for its pin-holder as, which I prefer to make as a small forlrbetween the ends of which the'pin is held 5 the fork, for convenience of construction, is made of thin metal,which is recessed in the slotted end of rod 2, which extends above the stem g to be secured by a hand, W. NVhen the .pin

y is in contact with the walls of sections aand E, the swinging of lever F can move the friction part E, and consequently the triangle B, in only one direction, but in order that the same movement of lever F maybe made to propel the triangle for ruling purposes in either direction, 1 form the camsurface upon part a of such length and shape'that, when the rod 2 .is turned to (by means of the fork secured thereto) move the pin to one endof the cam-surface, it will cause the wheel E to be clutched at a diflerent end of the traverse of handle F, and so enable themovement of the triangle to be reversed. The position of .the pint, relatively, is indicated by. the position of the hand W, which can be moved to mine the direction to be moved by the triangle, or can be in the position shown in Fig. 11, to render the movement of piece F in either direction inoperative. The distance to which the triangle is moved at each swing of lever F being determined by the distance between sides d d, by means of an adjustingscrew, 2, I am able to regulate the spaces between the hatch-lines. The friction-section E is held by a small flange upon the base of part a, the stem g from which, passing through the cover of the barrel 0, is clamped as aforesaid by the finger-piece'F, which, resting and turning on the shoulder m, holds the wheel E with all of its parts in proper position.

Without a departure from the principle of my invention, the ruler may be provided with rubber on one edge to come in contact with a corrugated wheel to secure the desired friction, ora spur-wheel may be used in connection with a rack upon the ruler; but I prefer a slightly compressible hard-rubber wheel for that purpose.

holder .90, and pin y, with operating-levenF,

for the purpose set' forth. 7

3. In combination withthe sections E and a, and with the clutch-pin y, pin-holder a2, and rod 2, the hand W, forthe purpose set forth.

4. In combination with finger-lever F, the sides d d of frame and set-screw 2, for the purpose shown and described,

JOHN B. PRICE.

Witnesses:

T. M. BROWN, It. F. HYDE.

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