US151139A - Improvement in miter-boxes - Google Patents

Description

Uvrrnn STATES LEANDER W. LANGDON, OF NORTHAMPTON, MASSACHUSETTS.

IMPROVEMENT IN NllTER-BOXES.

Specification forming part of Letters Patent No. 151,139, dated May 19, 1874; application filed February 16, 1874.

To all whom it may concern:

Be it known thatl, LEANDER W. LANGDON, of Northampton, in the county of Hampshire and State of Massachusetts, have invented certain new and useful Improvements in Miter-Boxes; and I do hereby declare the fola lowing to be a full, clear, and exact description ofthe same, reference being had to the accompanying drawings, making a part of this speciiication, in which-d Figure 1 represents in perspective the miterboX complete. Fig. 2 represents a plan of the bottom of the miter-boX as it appears when turned. bottom upward. Fig. 3 represents a verticalV cross-section, taken centrally through the saw-guides. Fig. 4 represents a wearingplate, which will be hereinafter. more particularly referred to.

My invention relates to certain devices or mechanisms, connected with a miter-boX, which simplify and lessen the cost of the miter-boX, whilst its efliciency and accuracy are at least not impaired, if they are not increased, by my improved construction of its parts.

Io enable those skilled in the art to make and use my invention I will proceed to describe the same with reference to the drawings.

A represents a bed-frameA or stand, made wholly or in part of cast-iron, with a support, B, of wood; thereon, upon which the material to be sawed rests, and which wood protects the teeth of the saw from metal. On the back or rear side of the iron bed-piece A there is cast a support, a, ,which serves as a pivotal point for the bar G to move around as its oenter of motion, as a firm support for the sawguide tube or cylinder D, which passes through it, and as the iiXed point for determining the angle or miter-joints to be cut. The tube or cylinder D, in which the saw-guide E is placed, is shouldered and reduced at its lower end, so as to pass through the solid support u., and into or through the bar or lever Q, in which it is fastened by a set-screw, 0, or other device, so as to move with said bar or lever. The saw-guide E is mortisedV and slotted, in the usual well-known way, to admit the back, blade, and teeth' of the saw to freely and snugly pass through it, and the tube, cylinder, or socket D, which contains said saw-guide, is

also slotted, as at b, for the blade of the saw to pass through. At the front end of the bar or lever C there is another tube, cylinder, or socket, F, which may be cast on or with said lever 5 and this socket is also slotted, as at d, for the admission and free passage of the sawblade through it. In this tube or socket F is supported and carried the second saw-guide G, which is mortised and slotted in a manner similar to that of its mate or fellow E, and for a similar purpose. The bar or lever C is cast hollow on its under side, and in such recessed portion, as at e, Fig. 2 and 3, there is pivoted a spring thumblatch, f, having'a bolt, g, upon it, which, when unrestrained, will take into any one of the notches z in the seg1nent-bar 7' attached, or cast with the bed-piece A, and upon its under side, as shown in Fig. 2. These notches t' are formed so as to hold the saw guides and the saw at the desired angle which is to be cut. The saw-guide Gr rests upon the thumb-lever f, so that when said lever f is raised up, preparatory to shifting it and thc saw-guides to the proper angle for the cut, it raises also the saw a slight distance above the bed or rest B, so that its teeth are clear of saidv bed, and free to move without obstruc tion or injury to the teeth of the saw. When the thumb-lever is released its spring will hold the bolt g against the segment j until the bolt arrives at the first one ofthe notches t' in the direction in which the bar or lever C is moved, and it will shoot into said notch and hold the saw-guides and bar or lever firmly at that point. There the bar or lever C moves against the segment j there will necessarily be some wear, and this wear will, if allowed to go on, make the lever and the saw-guide unsteady, and cause imperfect sawing. To avoid this I connect with the plate m, on the lever (l, a wear-plate, a, Fig. 4, the edge o of which bears against the inner perimeter of the segment j, and this wear-plate n being connected to the permanent plate m, by adjustingscrews passing through slots, as at r, Fig. 2. Said wearplate can be set up against the segment as the surfaces become worn, and thus the lever and saw-guides be always kept in true working position. l

Having thus fully described my invention, what I claim therein as new isGFA l. The combination of the lug, ear, or projection a on the back ofthe frame7 with the socket D passing therethrough and fastened to the lever C, and the saw-guide E passing through the socket D, and resting and turning upon the head of the screw c, as described and represented. l

2. In combination with the lever C and spring-thumb latch f connected thereto, the sawguide Gr, resting upon said thumb-latch or lever7 so that in raising the lever or latch to release its bolt from the segment the sawguide Gr and that end of the saw in it shall also be raised up7 as and for the purpose described.

3. In combination with the lever C, and its plate m, moving on or against the face of the segment j, the Wear-plate u, adjustably connected to the lever or its plate, and bearing against the inner perimeter of said segment7 as and for the purpose described and represented.

LEANDER YV. LANGDON.

Witnesses:

THOMAS DEAN, D. C. Roenes.

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