US60646A - Improvement in adjustable mitees - Google Patents

Description

P. A. SNYDER.

Mit er.

Patented Dec. 18. 1866.

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IMPROVEMENT IN ADJUdTABLE MITRES.

PETER A SNYDER, .OF JERSEY CITY, JERSEY.

Letters Patent No. 60,646, dated December 18, 1866. v

TO ALL WHOM IT MAY CONCERN:

Be it known that I, PETER. A. SNYDER, of Jersey City, in the county of Hudson, and State of New Jersey, have invented a new and improved Adjustable Mitre; and I do hereby declare that the following is'a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- I Figure 1 represents a top view of the same.

Figure 2 represents a vertical cross-section, taken on a plane indicated by the line x x, fig 1.

' Figure 3 represents a top view of a mitre, adapted for another-purpose than the one shown in figs. 1 and 4, and consequently constructed different from the same.

The object of my invention isto construct a Initre which may be readily adjusted toany angle, and one which will correctly divide each angle into two equal parts, sothat the moulding may be marked by it,,ready for cutting; and my improvement consists in attaching or pivoting two metallic blades to the front end of a stock and also to two metallic leaves, said leaves sliding on the rear end of said stock and being connected to it by a clamp-screw in such a manner that by sliding said screw forward or backward the said blades will form a larger or smaller angle, or in so arranging these blades and leaves that the angle formed by the two blades will, added to the angle formed by one of the blades and a leaf, always make up an angle of 180, and in so arranging all the aforementioned parts that by laying the said stock lengthwise against a moulding or board one of the said blades will lay above-the moulding in such a manner that by drawing a line along the edge of said blade upon the moulding and cutting the latter accordingly, it will just fit to its counterpart in the desired angle.

To the stock or handle, A, which is made of wood or any other suitable material, are pivoted at its front end the two blades, a and 6. These blades are again pivoted at their respective rear. ends to the leaves, a and d, and the latter are connected by the screw, e, sliding in the slot or groove,f, sunk into and along the centre of the stock A. The blades a and b, and the leaves 0 and cl, are made of sheet-metal strips wide enough to give them the necessary strength. The metallic strips, 9, which are screwed upon the surface of the stock A, are made wide enough to project somewhat overthe groovefiso as to prevent the head ofthe screw e, which travels in said groove, from moving up, thus guiding it in the desired manner. The nut, h, which also serves as a handle in moving the blades, does, when screwed down, keep the leavesc and d, and consequently, also, the blades a and b, in the desired position, all of the above being clearly represented in figs. 1 and 2: To measure an angle, and adapt the boards. or mouldings to the same, this apparatus has to be used as follows: After loosening the nut 71, place the end of thestock A into thecorner which is to be measured, and by then moving the screw e forwarduntil the blades touch the wall or casing, the mitre is in the position required, and the blades and leaves have to be kept in this position by screwing the nut it down. The stock A is then laid alongside of the board or moulding, so that the blade on that side will rest on top of said moulding, and will consequently indicate the line on which said moulding has to be cut. The blades a and b, and the leaves a and c2, being respectively of equal length, will consequently form the samc angle on each side of stock A, thus dividing the angle of the said corner into two equal parts. The leaves a and d have to be slightly larger than the blades, so as to permit the measurement of all angles not exceeding 180 Amitre constructed in the manner heretofore shown will answer for all general carpenters work, and do all the service that is required of such a tool in a superior, exact, and convenient manner; but it frequently occurs,- I especially. inship building, that the ceilings or the upper casings of doors, &c., are slanting, while the sides are perpendicular, thus forming two angles, which together make up 180, but of which one is larger than the other, (In fig. 3 these angles are shown by red lines.) To save the trouble of measuringboth of these angles, I provide a mitre which is otherwise constructed, exactly like the one above described, with two blades, i and 7c, and two leaves, l and m, all of which are of exactly the same length, so as always to form a parallelogram, and when set at right angles, a complete square. In measuring with thisdcvic'e, one of the above-mentioned angles, in the same manner as by the former plan, 2'. e., by placing-the end of the stock into the corner and making the blades touch the wall,-this angle will not only be measured, but also its supplement, to 180, which is always formed by one blade and the leaf to which it is pivoted, and thus the other angle is measured at the same time without undergoing the trouble of applying the mitre to it. This latter method is completely represented by fig. 3.

It will be observed that when the stock A is resting upon a flat surface, the blades a b and leaves 0 d car be readily adjusted to the required angle by means of the nut h and screw e, sliding in the groovef of the stock A.

I do not claim the pivoted blades a 6, leaves 0 d, and stock A, broadly considered, as I am aware that these parts are not new in themselves.

I'claim as new, and desire to secure by Letters Patent- The arrangement with the pivoted blades a 11, leaves a d, and fiat stock A, of the screw a, nut h, and groove f, when the parts are constructed so as to admit of the ready adjustment of the pivoted blades a Z1 and leaves a 01, when said stock is resting on a flat surface, as herein set forth.

PETER- A. sNrDER. Witnesses WM. F.-MONAMARA,

ALEX. F. ROBERTS.

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