US624745A - Miter-box - Google Patents

Description

No. 624,745. Patented May 9, |899.

T. BOUTSMAN.

MITEB BOX.

(Application led May 9, 1898.) (No Model.) 2 Sheets-Sheet I.

ATTORNEYS.

v Patented 'May 9, |899. T. BUUTSMAN.

MITER BOX.

(Application led Hay 9, 189B.)

2 Sheets-Sheet 2.

(No Model.)

W/TNESSES:

A TTOHIVEYS.

TH: Hemus PErzRs co. PHsTo-LITHD.. wlnsrdns'rcm4 n. s.

" Nrrnn STATESn PATENT OFFICE.

THEODORFJ BOOTSMAN, OF ARTIC, VASHINGTON.

MlTER-BOX.

SPECIFICATION forming part of Letters Patent No. 624,745, dated May 9, 1899.

Application filed May 9, 1898. Serial No. 680,174. (No model.)

To a/ZZ whom t may concern; Y

Beit known that I, THnoDonE BooTsMAN, of Artic, in the county of Chehalis and State of Washington, have invented a new and useful Improvement in Miter-Boxes, of which the following is a specification.

The object of my invention is to provide a simple, convenient, and practical miter-box which may be adjusted to make accurate sawcuts at any desired angle; and it consists in the peculiar construction and arrangement of the various parts of the same, as will be hereinafter more fully described with reference to the drawings, in which- Figure 1 is a side elevation, partlyin section. Fig. 2 is a vertical transverse section on line 2 2 of Fig. l. Fig. 3 is a top plan view, and Fig. 4. is a perspective view of one -of the saw-guides.

In the drawings, o c a2 is a base-frame having short legs c3, adapted to hold the device from slipping when in use. The table-surface consists of a flat horizontal plate or board a, upon which the lumber is supported while being cut, and at the back edge of this tablesurface there are two horizontal strips a' a', which adord a thrust-bearing for the lumber to hold it against the action of the saw. These two strips come quite close together in the center, leaving onlya slot between, as shown in Fig. l, so as to permit the passage of the saw between. Rising vertically from and fixed rmly in the base-frame are two posts A A, which at the top are connected by a cross-bar S. Lower down there is another cross-bar or plate H. This carries the sawguides and associated .parts and is made to slide vertically on the posts A A, so as to be capable of adjustment to permit the workto be placed under the guides in position on the table. Underneath the cross-bar H there is a horizontal arm T. This arm at its inner end is rigidly connected by screw-threads or otherwise to a vertical shaft B, which is provided with a series of parallel transverse grooves running throughout its length. This shaft turns axially with the arm T when the latter is swung horizontally, and said shaft in this movement swivels or turns loosely in the plate H, to which it is connected by means of cleats or lips c, fastened to the plate H and entering one of the grooves of the shaft B.

To the arm T are attached in suspended position the two saw-guides P P, made of metal plates, having theiriiat sides adjacent to each other and parallel, being spaced a distance apart just'sufiicient to receive the saw and allow it a loose play, and yet guide it in a true plane in its reciprocations. These guideplates have an offsetting flange at'the top, with grooves or recesses c2 c2, Fig. 4, in the upper face, which receive short ribs c' c' (see Fig. 2) on the lower side of arm T, so that when the plates are fastened to the under side of arm T by bolts b b the guide-plates are rigidly locked to said arm against turning. To

permit the plates P and P to be` adjusted v closer together or farther apart to accommodate different thicknesses of saws, a slot b' (see Fig. 3) is formed through the arm T at the point where one or' both of the bolts b pass through.

Attached to the cross-bar H in the center or formed with it there is a s'emicircular notched plate H', whose notches are adapted to receive a spring locking-lever K, fulcrumed on a horizontal axis on top of arm T. By unlocking this lever K from the notches of plate H the arm Tv and the attached subjacent guideplates may be swung to any desired angle to suit the angle or miter cut of the saw. The plate H is designed to be graduated and laid off and marked to the desired angles, and the notches are made to correspond.

With .this construction of parts it will be seen that it is necessary to raise .the sawguides to various heights to allow the work to be placed underneath the same. For this purpose the grooved shaft is made to rise through the cross-bar S at the top and to be connected to it at various altitudes, and thus hold the cross-bar H and saw-guides P P to the desired position. To permit this adjustment,a pair of spring clamping-jaws D D, Fig. 3, are fulcrumed on the top of cross-bar S and their adjacent edges are made to enter any one of the transverse grooves in shaft B, according to the height at which the parts are to be adjusted. To change the adjustment, it is only necessary to pinch together the lever ends of the jaws D D and throw'the latter out of the groove, and the cross-bar H, saw-guides P P, and shaft B may then be lifted to any desired height.

IOO

The saw X is to be made with straight parallel edges and may be made in sets, if desired, of different degrees of thickness and fineness of teeth.

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

l. In a miter-box, the combination of a vertically-adjustable cross-bar H; of a horizontal swinging a'rm T moving with said crossbar, locking devices for fixing said arm in different angular positions, and two suspended guide-plates P P, having iianges at their upper edges, and clamping-bolts, one of said bolt connections being slotted to permit adjustment between the plates, and the said plates having an interlocked or notched joint with the arms to prevent them from turning on their clamping-bolts substantially as shown and described.

2. In a miter-boX, .the combination with framework having a cross-bar at the top, and the vertically-adjustable saw-guides having a transversely-grooved vertical shaft; of a pair of spring clamping-jaws fulcrumed to the top cross-bar and locking into the transverse grooves of the shaft substantially as and for the purpose described.

THEODORE BOOTSMAN. Witnesses:

W. C. PETTIT, R. E. DAWDY.

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