IMPROVEMENTS IN APPARATUS FOR CUTTING MORTISE HOLES IN WOOD
Year: 1882

page_text: LETTERS PATENT to John Hall and William Hall, both of Wilford Street,
in the Town and County of the Town of Nottingham, for an invention
of "IMPROVEMENTS IN APPARATUS FOR CUTTING MORTISE HOLES IN WOOD."
PROVISIONAL SPECIFICATION left by the said John Hall and William
Hall at the Office of the Commissioners of Patents on the 21st March 1882:
JOHN HALL and WILLIAM HALL, both of Wilford Street, in the Town and
County of the Town of Nottingham. "IMPROVEMENTS IN APPARATUS FOR
CUTTING MORTISE HOLES IN WOOD.
In carrying our improvements into effect we employ a template of such length
as to receive the piece of wood to be mortised and having openings therein of the
length and number corresponding with the required mortises such template is
placed on the side of the wood being mortised abutting upon the fence of the
machine.
The Fence is provided with a stop piece projecting from it the width of which
equals the space occupied by the chisel when that chisel is in the position necessary
for cutting the ends of the mortise hole. The stop piece projects from the face of
the fence into the openings of the template by which means, the piece of wood to
be mortised can have the mortises completed therein without the wood being
previously marked from another piece as is the usual practise.
We effect the automatic reversal of the chisel by the falling of the bed of the
machine to its lowest position as follows. The bed of the machine being lowered
until the chisel is clear of the wood being mortised it then comes in contact with a
trigger action in connection with the reversing action of the chisel and upon the
bed reaching its lowest point such trigger is released and allows the reversing
apparatus of the chisel to assume its original position and also the trigger its own,
and allowing the bed to be raised for the mortising operation to be repeated the
trigger being then in such a position as to be put in motion on again lowering the
bed of the machine.
The chisel is fixed in such a manner as to enable the piece of wood being
mortised to be mortised on its underside through a hole in the bed of the machine
and by which means the chippings forming the core in the mortise being made
will fall to the ground on the downstroke of the chisel.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Hall and William Hall in the Great Scal Patent Office on
the 19th September 1882.
JOHN HALL and WILLIAM HALL both of Wilford Street in the Town and
County of the Town of Nottingham "IMPROVEMENTS IN APPARATUS FOR CUTTING,
MORTISE HOLES IN WOOD"
In carrying our improvements into effect we employ a template of such length
as to receive the piece of wood to be mortised and having openings therein of
the length and number corresponding with the required mortises, such template
is placed on the side of the wood being mortised abutting upon the fence of
the machine.
The fence is provided with a stop piece projecting from it the width of which
equals the space occupied by the chisel when that chisel is in the position necessary
for cutting the ends of the mortise hole. The stop piece projects from the face of
the fence into the openings of the template by which means the piece of wood to
be mortised can have the mortises completed therein without the wood being
previously marked from another piece as is the usual practice.
We effect the automatic reversal of the chisel by the falling of the bed of the
machine to its lowest position as follows. The bed of the machine being lowered
until the chisel is clear of the wood being mortised it then comes in contact with a
trigger action in connection with the reversing action of the chisel and upon the
bed reaching its lowest point such trigger is released and allows the reversing
apparatus of the chisel to assume its original position and also the trigger its own,
and allowing the bed to be raised for the mortising operation to be repeated the
trigger being then in such a position as to be put in motion on again lowering the
bed of the machine.
But that the invention may be the better understood we will by the aid of the
accompanying drawings proceed to describe means pursued by us in carrying the

page_text: This fence L is provided with a stop piece B which enters the slotted opening A¹
in the template A to regulate the distance of traverse for the required mortise.
The width of the stop piece B fully equals the space occupied by the reversals of
the chisel or cutter c employed. The stop piece B projects sufficiently into the
slot A in the template to regulate the distance of traverse of the template and
upon the template being moved longitudinally in either direction on the table or
bed b the slot A¹ alternately comes in contact with the opposite edges of the stop B
to regulate the length of the mortise or mortises being produced.
In using very narrow templates it is convenient to form the recess or recesses in
the edge of the template and to place the stop or stops at a convenient height to
enter such recess or recesses.
The automatic reversal of the chisel c is effected in the following manner.
In Figures 1 and 2 the bed or table b of the machine is shown lowered
sufficiently to allow of the cutting edge or end of the chisel to be clear of any
wood held by the template A At such time by the projecting end F of the foot
lever G coming against to bear upon the turned in end H of the trigger rod E the
same will put the trigger K in contact with the stop rod C which is the stop for
keeping the chisel from being reversed by the strap N.
Upon the bed or table 6 being lowered until the projection F rests on the end H
of the trigger rod E that rod E then draws down the rod C, and then the stationary
incline J by acting on the trigger K draws the trigger K sideways and allows the
rod C to fly up in time to stop the chisel upon the chisel completing its half
revolution. The rod C being carried up by a spring in the bracket M upon the
bed or table being again raised to continue the operation of mortising, the trigger K
and the rod E assume their original relative positions by means of the spiral
springs marked S. The trigger K is pivotted upon the top end of the rod E at
the point marked D to allow the trigger to be moved sideways by the incline J.
With regard to the last paragraph of the provisional Specification as thus
expressed.
The chisel is fixed in such a manner as to enable the piece of wood being
mortised to be mortised on its under side through a hole in the bed of the machine
and by which means the chippings forming the core in the mortise being made
will fall to the ground on the downstroke of the chisel.
We have not at present found the arrangement there described to answer to
our satisfaction and therefore wish to omit further reference to it in the final
Specification.
Having thus described our Invention and means which we adopt in carrying
the same into effect we would have it understood that What we claim is :-
First, The arranging or combining parts forming apparatus for use in facilitating
the cutting of mortise holes in wood substantially as described.
Secondly. We claim the use of the template with slot hole therein to act
with a stop piece for regulating the length of slot produced substantially as
described.
Thirdly. We claim the arranging or combining parts whereby the lowering
motion of the table or bed b effects the automatic alternate reversal of the chisel
or cutter as described.
In witness whereof I the said John Hall have hereunto set my hand and
seal this fifteenth day of September One thousand eight hundred and
eighty-two
JOHN HALL (L.S.)