US18110A - Instrument for drawing the curve op circular stair-railings - Google Patents

Description

G. S. STEWART.

Drafting Face Molds for Stairs..

No. 18,110'. l Patented Sept. Jij-1857.

y FaQ/Z UNITED STATES PATENT OFFICE.

GEORGE S. STEWART, OF MEADVILLE, PENNSYLVANIA.

INSTRUMENT FOR DRAWING THE CURVE 0F CIRCULAR STAIR-RAILIN GS.

Suecication of Letters Patent No. 18,110, dated September 1, 1857.

To all 'whom it may concern:

Be it known that I, GEORGE S. STEWART, of Meadville` in the county of Crawford and State of Pennsylvania, have invented a new and useful Machine for Drawing Various Kinds of Stair-Rail Patterns, termed by carpenters Face-Molds; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings and.

the letters of reference marked thereon.k l

Figure l represents my machine adjusted in worlng order.

H H is the frame of my machine. On the inside of this frame is a groove in each of the pieces H H, as shown at Y. In these grooves the bottom board W is constructed to slide out and in freely.

A is an upright post, at the inner corner of which a rod S is attached and tightened or drawn straight by a nut and screw R, the lower end of the rod passing through a stirrup and fastened with a head on the end thereof. 'f

O is a radius made to slide freely up and down on the rod S by means of a hinge U.

Mis a pencil holder constructed so as to slide on the radius O and fastened at any place thereon desired by the set screw N.

B is another post similar to A laid off in inches as shown.

T is an arm made to slide up and down ina mortise in the post B and fastened Where desired by set screw z'. On this arm T (which is also laid off in inches) is a rest Z made to move on the arm T and fastened where desired by the set screw Q. See Fig. 2. D is a table on which the paper is laid for drawing the pattern. This table is hung with the hinges X X to the movable piece E, which moves on the pin L, and is kept in the desired elevation by the semicircle F, and set screw J. This table is attached to the bottom piece W W and moves with it, and may be set at any desired distance from the posts A, B.

C1 is a leaf of the table D made to move around a pin V.

Now the manner of working the machine is as follows, to wit: Lay off the half of the distance of the outside diameter of the rail from the rod S to and on the arm T and setthe rest Z at that point; then set the point of the pencil P to the rest Z, set the top of the index K (which is of the same height of the rest Z) to a distance or height Y on the post B equal to the aggregate height of the risers of the quarter of the cylinder of the stairs; give the piece E the inclination of the stairs by placing the pitch board of the stairs between E and G. This gives the table D the proper inclination z'. e. the inclination of the stairs. Place the leaf C on the rest Z. The bottom board W is set for use as follows, to wit: It is made to slide in grooves in H H as may be desired, and it is so adjusted that when the paper is laid on D, C, that the pencil M will scribe the circle desired on the same and for a smaller circle the 'board w is pushed in and for a larger drawn out. Now lay a piece of paper on the table and leaf D and C, and then move the pencil down on the paper, the radius O moving down the rod S so that the pencil P will rest on the paper, and you have the draft of the face mold; then move the pencil in toward A the distance of the width of the rail and draw another line; then lay a rule from the post B to'A and draw a line and you have the butt joint; then draw another line at right angles to the posts A and B or parallel to H and you have the lower joint, and the pattern is complete. y

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

The construction of a machine with an adjustable table D, C, and the graduated post' B and arm T adjusted with the set screws, Q, z' and the semicircle F constructed as ldescribed or any other substantially the same and which will produce the same results.

eno. s. STEWART.

Witnesses:

A. B. RICHMOND, WM. D. TUCKER. R. U. MCENTIRE.

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