IMPROVEMENTS IN BITS FOR MORTISING AND BORING
Year: 1877

page_text: LETTERS PATENT to George Wrigglesworth, of Otley Road, Bradford, in the
County of York, Timber Merchant, for the Invention of "IMPROVEMENTS IN
BITS FOR MORTISING AND BORING."
Sealed the 28th August 1877, and dated the 6th March 1877.
PROVISIONAL SPECIFICATION left by the said George Wrigglesworth at
the Office of the Commissioners of Patents on the 6th March 1877.
GEORGE WRIGGLESWORTH, of Otley Road, Bradford, in the County of York,
Timber Merchant. "IMPROVEMENTS IN BITS FOR MORTISING AND BORING."
The object of my Invention is to cut the mortice holes in timber by means of a
rotary mortising tool arranged in such a manner that the tool will cut the hole
parallel and in a straight line, and not follow the bate of the timber.
This is accomplished in the following manner:-I secure the mortising tool at the
end of any ordinary vertical or horizontal shaft revolving at a high speed; the
section of the cutting end of the mortising tool is in the form of the letter S; the
centre part of the cutting end of the tool projects, and when mortising cuts a narrow
space in the centre of the hole to be mortised the distance travelled by the timber.
By means of this projecting end the tool is not sprung out of line when mortising
knotty or curled bated timber. The 2 portion of the tool may be twisted the same
as a twisted drill for iron, but coarser in pitch of the twist, which facilitates the
clearing of the cuttings from the tool in narrow mortice holes. The timber to be mor-
tised is fixed to a common slide, and fed in the same manner as ordinary machines.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Wrigglesworth in the Great Seal Patent Office on the 4th
September 1877.
GEORGE WRIGGLESWORTH, of Otley Road, Bradford, in the County of York,
Timber Merchant. "IMPROVEMENTS IN BITS FOR MORTISING AND BORING."

page_text: The object of my Invention is to cut the mortise holes in timber by means of a
rotary mortising tool arranged in such a manner that the tool will cut the hole
parallel and in a straight line, and not follow the bate of the timber.
This is accomplished in the following manner :-I secure the mortising tool at the
end of any ordinary vertical or horizontal shaft revolving at a high speed, the
section of the cutting end of the mortising tool as per sketch 2 ; the centre part of
the cutting end of the tool projects, and when mortising cuts a narrow space in the
centre of the hole to be mortised the distance travelled by the timber. By means
of this projecting end the tool is not sprung out of the line when mortising knotty
or curled bated timber. The portion of the tool may be twisted the same as a
twisted drill for iron, but coarser in pitch of the twist, which facilitates the clearing
of the cuttings from the tool in narrow mortise holes. The timber to be mortised
is fixed to a common slide and fed in the same manner as ordinary machines.
But in order to enable my improvement to be better understood, I will proceed
to describe the same by the accompanying Drawing, in which Figure 1 is an eleva-
tion of my improved mortising tool, shewing the projecting end A, and the inclina-
tion of the twist by the lines B, B. The end a cuts a narrow space in the timber,
which is a means of preventing the tool springing whilst mortising; C is the cutting
edge, and in travelling the timber cuts the same and leaves the sides of the mortised
hole clean and smooth; the portion D is cylindrical, and the end marked E is for
securing the tool in the end of the revolving shaft; Figure 2 is a section through
the line a, b, which shows the recesses in the tool formed by the twist of the same
for the purpose of clearing the timber cuttings away out of the hole.
Having thus described my said Invention, and the manner in which the same is
or may be performed, I have to state that I do not restrict myself to the precise
form of the projection at the point and the curve of the twist of the tool herein
described and shown in the Drawing, but that what I believe to be novel and
original and claim as the Invention secured to me by the herein-before in part
recited Letters Patent is the arranging of a revolving tool for mortising and boring
the centre part of the cutting end of the tool projecting and. the tool twisted, sub-
stantially in the manner described and shewn on the Drawing.
In witness whereof, I, the said George Wrigglesworth, have hereto set my
hand and seal, this Thirty-first day of August, in the year of our Lord One
thousand eight hundred and seventy-seven.