Untitled record

77θ ddo2272^ Jdosd/TZB dT-7/3,757. /^07./072/00/dor. 6, /855.

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AM. PHOTO-LITHO. CO. N.Y. (OSBORNE'S PROCESS.)

UNITED STATES PATENT OFFICE.

WILLIAM NIXON, OF ADRIAN, MICHIGAN,

CUTTER-HEAD FOR ROTARY PLANERS.

Specification of Letters Patent No.

13,757, dated. November 6, 1855.

To all whom it may concern:

Be it known that I, William Nixon, of Adrian, in the county of Lenawee and State of Michigan, have invented an Improvement in Planing-Machines, and that the following is a full, clear, and exact description of the principle or character which distinguishes it from all other things before known and of the usual manner of making, modifying, and using the same, reference being had to the annexed drawings, of which—

Figure 1 is a perspective view of the machine, and, Fig. 2, a detached end view of the cutters.

My invention consists in so mounting the plane stocks that they may be adjusted to different thicknesses of plank or different depths of cut without changing the tension of the driving belt; and also in constructing the plane stock so as to make it fulfil the purposes of a cap iron as herein set forth.

The revolving cutter stock g has its bearings in sliding pieces d, d, xvhich are firmly connected together by a cross piece /. These sliding pieces are inclined at an angle of about forty five degrees and rest with their under concave circular surfaces on the upper edges m m of the uprights i, i which form part of the main frame of the machine. These upper edges of the uprights are curved in a convex way so as to conform to the concave circular under surface of the sliding pieces. The center of this circle lies in the axes of the two driving pulleys 7c, 7c. Belts pass over said pulleys 7c, 7c, and pul- 35 leys I, I, on the axis of cutter stock g. Thus the sliding pieces can be moved up or down the circular ways m, m xvithout changing the distance betxveen the axis of the cutter stock g and driving pulleys 7c, 7c, by which 40 means the driving belts xvill be kept at a uniform tension whatever the elevation of the cutter-stock above the planing bed 7i may be. The cutters a a, are attached to the cutter stock g and are provided at their 45 cutting edge a with a double bevel a, c and a, b. At the termination of the bevel a, b at b in rear of the cutting edge a the cutter stock rises abruptly thereby throxving the shavings back and preventing the cutter ⁵⁰from entering any deeper into the material to be planed, so that it supplies the place entirely of a cap iron and gives a firm support for the cutter.