IMPROVEMENTS IN THE METHOD OF CUTTING TENONS, APPLICABLE TO MORTISING MACHINES
Year: 1880

page_text: LETTERS PATENT to Edward Cory, of No. 3, Porteus Road, Harrow Road,
in the County of Middlesex, for an Invention of "IMPROVEMENTS IN THE
METHOD OF CUTTING TENONS, APPLICABLE TO MORTISING MACHINES."
PROVISIONAL SPECIFICATION left by the said Edward Cory at the Office
of the Commissioners of Patents on the 14th December 1880.
EDWARD CORY, of No. 3, Porteus Road, Harrow Road, in the County of Middlesex.
"IMPROVEMENTS IN THE METHOD OF CUTTING TENONS, APPLICABLE TO MORTISING
MACHINES."
My method is to attach to the chisel holder of a mortising machine when the
chisel is removed a suitable frame for carrying two or more vertical saws, and
which is so constructed that the said saws may be fixed at different distances apart
according to the width of the tenon or tenons desired to be cut. The saws are
strained tight in the said frame, which is of sufficient length to reach below the
holder or saddle of the machine and be free from contact with the material acted
upon during its vertical retrograde motion. The material is fixed in the ordinary
holder or saddle of the machine, and is fed on to the saws by the hand wheel, or
by any suitable self-acting feed motion which may be driven from the other
moving parts of the machine.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Cory in the Great Seal Patent Office on the 14th June
1881.
EDWARD CORY, of No. 3, Porteus Road, Harrow Road, in the County of Middlesex,
Civil and Mechanical Engineer. "IMPROVEMENTS IN THE METHOD OF CUTTING
TENONS, APPLICABLE TO MORTISING MACHINES."
Mainly, the object of this Invention is to construct an apparatus for cutting
tenons which can be applied to and used upon a mortising machine, thus making

page_text: the machine perform the two operations which are so nearly allied in carpentry; and
my said Invention consists of a moveable frame which can be screwed or attached
to the chisel bar or holder of the mortising machine, and which shall be made to
carry saws for cutting the tenon.
In cutting a single tenon two saws are adjusted in the frame at the required
distance apart, the said frame being made long enough to reach below the saddle
or bed of the machine.
The piece of wood to be operated upon is then fixed in the machine, as for
mortising, but with its end to the saws, and is fed onto the saws by the ordinary
hand wheel of the machine, while the saws are made to take a vertical retrograde
motion by working the lever. For cutting a double tenon four saws may be fixed
in the frame at the necessary distances apart.
Should it be required, the motion by which the material is fed upon the saws
may be made self acting by the well known appliances used in mortising machines,
it would then only be necessary, after the work is fixed, to move the lever of the
machine with a retrograde motion.
The said Invention is also applicable to a steam mortising machine, wherein
either the whole or part of the operation may be made self-acting, as in cutting
a mortise.
The apparatus may be constructed as hereafter described with reference to the
accompanying Drawings. A, A, Fig. 1 & 2, is a wrought or malleable iron
frame with a hollow boss at B made to fit on the chisel bar of the mortising machine
and attached by the set screw C. The saws D, D, which are buckled similar to
frame saws in a deal frame sawing machine, are fastened or hooked to the top part
of the frame, and are drawn tight by means of cottars E, E, below.
In constructing the saws for the frame I prefer to make them slightly out of the
perpendicular, i.e., the upper teeth to overhang; by this arrangement if the material
to be cut is fed upon the saws when the frame is up the saws cut during the whole
of the downward stroke.
Fig. 2 represents the said Invention as applied to an ordinary hand power
mortising machine, where A is the frame attached to the chisel bar F, and carrying
the saws D,D; G is the piece of wood to be operated upon, held in the saddle or
bed by the screw H; I is the hand wheel which causes the saddle to traverse hori-
zontally, and which feeds the material on to the saws, the saws being at the same
time made to move vertically by means of the lever J.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed or carried out in practice,
I hereby declare that I claim as my Invention the application of two or more saws
in a frame to the chisel bar of a mortising machine, by which the machine is
converted into an apparatus for cutting tenons.
In witness whereof, I, the said Edward Cory, have hereunto set my hand and
seal, this Fourteenth day of June, in the year of our Lord One thousand
eight hundred and eighty one.
EDWP. CORY. (L.S.)