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This invention is an improvement on that class of mortising machines intended for hard and large work, which cut by means of an auger in a hollow square chisel. In our engravings, Fig. 1 is a perspective view of the machine, and Fig. 2 a section of the nut-screw, by which means the auger and chisel are raised and lowered. Similar letters refer to the same parts in each. A is the stuff in which the mortise is to be cut, and B, the base of the machine on which are two pair of clamps, C, operated by the handles, D, and screws, and traveling along the iron ways, b. On B arc erected the ways or elides, E, at right angles, fastened to it by screws, e: in these ways slides the apparatus for boring, it-consists in bed-plate F, shaped as shown in the engraving and having rising from it two standards, G, and two blocks, IT, which support the rest of the machine ; a pin and spring, /', retain this in any position on the ways, E. On one of the blocks or supporters, II, is fastened a rack, I, and on the standard, G, slides the framing, J, which carries the square chisel, K firmly attached to it and through a circular vertical journal, J', passes the auger, L, having on the top a small bevel wheel, M, this is rotated by the bevel wheel, X, placed on the shaft, 0, working in journals, J//, and turned by the handles, P. In the frame, J, is another vertical journal, J//7, in which is the screw shaft, Q, having the bevel wheel, Yl, at one extremity and the shaft passes through the top plate, S, in which is a movable nut represented in Fig. 2. Tills movable nut is in two pieces, s, s, fastened to the angular sliding piece, T, which can be secured so that the nut is either in or out of gear by the catch, t. On the shaft, 0, there is also mounted a small bevel wheel, U, which can slide on the shaft so as to be either in or out of gear with R, and another gear wheel, V, which can slide into the teeth of the rack, I, or be free from it. The operation is as follows : the whole boring apparatus is slid along the ways, E, over the stuff to be mortised, and the piece, T, drawn out to admit the screw freely to pass down the wheel, V, which is geared into the rack and turned to bring the auger frame, J, on to the stuff; it is then thrown out, the piece, T, pressed back and secured by t, the wheel, U, put in gear with R, and the handles rotated; the anger being turned, and with the chisel, let into the hole at one operation by means of the screw, Q. By moving the bed-plate, F, the mortise can be made any length. This very compact machine is the invention of Levi Kittinger, of East Greenville, Ohio, and the patent lms been applied for.
