US18838A - And amos h - Google Patents

Description

UNITED STATES PATENT OFFICE.

JUAN S. L. BABBS, OF BOSTON, MASSACHUSETTS, AND AMOS H. RAY, OF PROVIDENCE, RHODE ISLAND.

ADJUSTABLE GAGE FOR DOVETAILS.

Specication of Letters Patent No.

To all whom it may concern.'

Be it known that we, JUAN S. L. BABBs, of Boston, in the county of Suffolk and Commonwealth of Massachusetts, and AMos H. RAY, of the city and county of Providence and State of Rhode Island, have invented a new and useful Graduating Dovetail Gage, for Marking or Setting Out Dovetails on Wood Preparatory to Sawing; and we do hereby declare that the following is a. full, clear, and eXact description thereof, references being had to the annexed drawings, which form a part of this specification.

Hitherto no instrument has been invented, as your petitioners verily believe, which can be employed advantageously for marking dovetails.

This new invention obviates all former objections to the old method of setting out dovetails by hand (in a manner hereinafter described) Figure 1, is an elevation of the graduating dovetail gage. Fig. Q, is a plan of the same. Fig. 3 is a transverse section.

A, A, is the bar, being a straightI piece of wood having a series of cutter heads marked C, C, with knives or markers, attached to` the top, and bottom sides of the same. The cut-ter heads are made to slide easily upon the bar, and are held in their respective places by set-screws d, (Z, thereby admitting of adjustment for marking various sizes of dovetails, as may be required.

B, B, are movable or sliding gages, and are also made to slide upon the bar A, A, in the same manner as the cutter heads before described. These gages are provided with elongated slots, which allows them to traverse backward and forward upon the bar A, A, at right angles with the same, by which means this instrument may be used for marking the dovetails upon one piece of stock, and also the pins upon the other piece, to match the dovetails, by employing but one set of the knives or markers.

f, f, are stops, for the movable gages B, B, when used upon various thickness of stock, by changing the position of these stops and moving them nearer or farther from the center of the elongated slots; the length of the dovetails may be increased or diminished. These stops may also be formed by inserting a screw at the end of each of the gages of suicient length to admit of the graduation required.

18,838, dated December 15, 1857.

D, is the end guide, and is designed to govern the first dovetail from the edge of the stock. This consists of a head, similar to the common gage head, and is also made to slide upon the bar, to accommodate the different widths of stock to be marked.

e, c, are plain heads, and are used to hold the sliding gages in their proper places; the sliding gages being placed upon the bar outside of t-he end cutter head, the plain head is then placed against the same, thus allowing the gage to traverse freely between them.

Mode of using: 1st, place the cutters upon the end of the piece to be marked, having the end piece D, in the left hand, carry the instrument from you, until the movable gages are checked by the stops f, f. Move it to the right until the end guide D strikes against the edge of the boa-rd; then place a block of wood upon the top cutters and give the same a slight blow with a mallet or some like instrument, and a perfect impression is obtained. After marking the dovetails and pins, upon one end of the stock, turn the instrument over, holding the end piece D, in the right hand, and proceed as before upon the other end of the stock, the result will be the same.

By the use of an instrument so construct-- ed much time and labor is saved, as also a greater uniformity is obtained. Numbering each piece ofstock 1, 2, 3, &c., as in the old method of setting out dovetails by hand is rendered unnecessary, as the workman can depend upon any number of pieces marked with this instrument fitting together perfectly.

Having thus described our invention, we will state our claims:

1. The use of the bar A, A, provided with two or more stationary, or movable, cutterheads, with knives or markers attached, as described, for the purpose herein set forth.

2. The arrangement of the movable gages B, B, operating as described, for the purpose specified.

JUAN S. L. BABBS. AMOS H. RAY.

Witnesses:

JAMES M. MOORE, WM. H. WHITAKER.

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