IMPROVEMENTS IN TOOLS FOR CUTTING TENONS
Year: 1877

page_text: LETTERS PATENT to William King, of 21, Lockington Road, Battersea Park,
in the County of Surrey, Joiner, for the Invention of "IMPROVEMENTS IN
TOOLS FOR CUTTING TENONS."
Sealed the 13th October 1877, and dated the 19th April 1877.
PROVISIONAL SPECIFICATION left by the said William King at the Office
of the Commissioners of Patents on the 19th April 1877.
WILLIAM KING, of 21, Lockington Road, Battersea Park, in the County of
Surrey, Joiner. "IMPROVEMENTS IN TOOLS FOR CUTTING TENONS."
The improvements consist in the use of three cutters, a centre and two lateral
ones; also in making the side cutters adjustable, so that they can be adjusted to
the size of the work required; further, the centre cutter removable, so that a single
tenon can be cut as well as a double; also in shaping the inner sides of the outer
cutters that their inner sides may be shorter than their outer, and so that their
cutting edge shall be at an angle of 30° or thereabouts to the vertical of the tool
when in position, said edge being flat on the face of the tool and bevelled on the
back side; lastly, sometimes in turning up or grooving the inner edge of the outer
tools to prevent their tendancy to spread, and so neutralize the pressure on the
outside cutters.
The cutters can be of metal fixed to a metal block, and have chases in which the
tools can be held, and by means of set screws they can be held in various positions,
as desired; the block can be placed in any morticing machine and used as at
present.
0
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William King in the Great Seal Patent Office on the 18th October
1877.
WILLIAM KING, of 21, Lockington Road, Battersea Park, in the County of
Surrey, Joiner.
"IMPROVEMENTS IN TOOLS FOR CUTTING TENONS."

page_text: The improvements consist in the construction and use, for the purposes of cutting
tenons and other like purposes, of three cutters, a centre and two lateral ones, the
side cutters being adjustable to the size of the work required, and the centre cutter
removeable so that a single tenon can be cut as well as a double, shaping the inner
side of the lateral cutters so that their inner sides may be shorter than their outer,
and so that their cutting edges shall be at an angle of 30°, more or less, to the
vertical of the tool when in position, said edge being flat on the face of the tool and
bevelled on the back side; lastly, in combination with the above arrangement of
tools the turning up or grooving the inner edges and points of the lateral tools,
to prevent their tendancy to spread, and so neutralizing the pressure on the outside
cutters.
The cutters can be of metal, preferably steel, fixed to a metal frame or block, and
have mortices or other convenient contrivance therein, in and by which the tools
can be received and held, and by means of set screws or other fasteners they can
be maintained in various positions, as desired; the block is to be furnished with a
socket, and can be placed and used in any ordinary morticing machine.
The Drawing, hereunto annexed, will serve to show in a practical shape a mode
of carrying out my Invention.
A, B, C, are the three cutters placed on a frame, bar, or block F, on which they
can be slided or adjusted, and fixed when in adjustment by the set screws E, E, E,
passing through the tools and the mortices in the frame F, as shown; G is the
socket with a screw attachment, by means of which it and the frame F is fixed to
the plunger of an ordinary morticing machine; the Drawing shows the face of the
tools, the back are bevelled so that the inner sides are thicker than the outer.
For cutting one shoulder of a tenon shorter than the other, guages or distance pieces
of the thickness necessary are used, placed between the frame and one of the lateral
cutters, so that one side cutter stands out from the plane of the other the distance
required, and is operated at that distance, being clamped in position on and by the
screw E which is made long enough for the purpose.
I wish it to be understood that I do not limit myself to the exact mode shown
in the Drawing, as my Invention can be performed in various ways without
departing from the nature thereof, but the mode shown is the best I am at present
acquainted with.
In witness whereof, I, the said William King, have hereunto set my hand
and seal, this Fifteenth day of October, in the year of our Lord One
thousand eight hundred and seventy-seven.