US29920A - Mortising-machine - Google Patents

Description

UNITED STATES PATENT oEEicE.

HENRY C. SMITH, OF CLARKSVILLE, OHIO.

MORTISING-MACHINE.

Specification of Letters Patent No. 29,920, dated September 4, 1860.

To all whom it may cof/wem:

Be it known that I, HENRY O. SMrrH, of Clarksville, Clinton county, Ohio, have invented certain new and useful Improvements in I/Iortising-Machines; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification.

My invention consists in peculiar devices for operating and feeding a circular cutter' head.

In the accompanying` drawings Figure l is a perspective view of a mortising machine embodying my improvements. Figs. 2 and 8 are views of different positions of the cutter head and operating mechanism.

A block A, bearing the cutting and feeding devices, is arranged to slide vertically between upright posts Z) of frame B. Block A is adapted to be raised or lowered by means of its journaled shaft and pinion C, D, said pinion gearing into the stationary rack E, iirmly secured to frame B.

A circular cut-ter head F is pivoted at f to hanging brackets G, the latter being firmly secured to block A. The cutter g, which is of the length of the mortise required to be cut, is secured to the cutter head by means of screws 7L and receives through devices hereinafter described a reciprocating half circular movement. The diameter of circle that point of cutter g in part traverses is equal to the required width of the mortise. The cutter is arranged to shave out a clean half circular cut at each forward motion, and is fed down directly before the commencement of each cut. The cutter is operated (through pitman H and link I) by lever K, which is connected to pitman H at a and fulcrumed on the block A at c, and is provided on its end K with a pawl L, working into ratchet wheel M on shaft C, on which shaft is also mounted a pinion D, meshing in the fixed rac t E. The said parts are so adjusted that directly before the termination of each return stroke of the lever K it may move forward ratchet wheel M and pinion D, and thus feed down block A and cutter F g a suliicient distance for the next cut.

O is a retaining pawl hinged to the sliding block, as shown.

The lower end of the pitman I-I is provided with a curved projection c, adapted, in the latter portion of the forward movement of the cut-ter to work over fixed pin (Z, between plates N of cutter head, and thus relieve the link I of the downward strain of the pitman H to prevent said link being forced against the curved bottom of the mortise.

The work to be mortised is secured to the bed of the machine by means of lever P, clamp Q., and retaining pin stand R, the latter being provided with a pin to fit any of the range of perforations.

Different sizes and lengths of cutter heads can be used by a substitution of different brackets G and pitman and links H, I, to suit each cutter head.

The cutter may be raised from the work at any time by means of handle S after withdrawal of pawl o.

I claim as new and of my invention here- 1n- The pitman H, e, link I and pin (l operating in connection with a reciprocating rotary cutter head (F) in manner substantially as and for the purposes set forth.

In testimony of which invention, I hereunto set my hand.

HENRY C. SMITH. IVitnesses GEO. H. KNIGHT, C. STEEMER, J r.

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