IMPROVEMENTS IN THE MANUFACTURE OF FIRMER CHISELS AND GOUGES
Year: 1884

page_text: ⚫ ], JAMES FREDERICK GILL of 35 Harold Street, Sheffield in the County of York
Teapot Handle Maker do hereby declare the nature of my said invention for
IMPROVEMENTS IN THE MANUFACTURE OF FIRMER CHISELS AND GOUGES, to be as
follows:-
My invention relates to improvements in the manufacture of firmer chisels, the
object being to reduce the cost of manufacture. In carrying out my invention
which refers more particularly to the method of securing the bolsters of such
chisels, I cut or punch from steel or steel faced iron, (which may be rolled to the
desired taper for the blade and tang ;) a mood or blank of the chisel, and upon the
tang in the position or place where the bolster is to be fixed, I form an indentation
on one or both sides.
I form the bolster by punching it out to the desired shape, and with a centre
hole to fit over the tang.
I then heat the bolster to a suitable degree, and pass it on to the tang up to the
indentations before named; I now place it between a pair of top and bottom tools
known as "prints "-which may be used in a stamp, steam hammer, or be worked
by any similar means, and 1 compress the heated bolster into the indentations
formed in the tang, and at the same time "print" or shape the bolster into the
finished pattern.
The cooling of the bolster causes it also to contract, thus firmly securing it in the
desired position.
The bolster may be secured either before the chisel is drawn out, or after.
Although I have described the mood or blank as being punched out, my,
invention of attaching the bolsters may be applied to forged chisels or gouges.

page_text: COMPLETE SPECIFICATION.
I, JAMES FREDERICK GILL of 35 Harold Street, Sheffield in the County of York
Teapot handle maker do hereby declare the nature of my invention for IMPROVE-
MENTS IN THE MANUFACTURE OF FIRMER CHISELS AND GOUGES, and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement, that is to say :-
My improvements in the manufacture of Firmer Chisels and Gouges, have
reference to reducing the cost of manufacture.
It refers more particularly to the method of bolstering such tools, in which
portion of the tool the principal cost of manufacture lies.
In carrying out my invention, I make the bolsters separately, either by casting,
forging or other process, and with a centre hole to fit over the tang.
I forge, or punch out of steel or steel faced iron (which may have been previously
rolled to the desired tapers for the blade and tang) the blank or "mood" of the
Chisel or gouge, and either at the same time, or by a separate process I form
indentations on each side of the tang where the bolstor is to be fixed, of any
desired form.
I then heat the bolster to a suitable degree and pass it on the tang, over or on
to the said indentations, I now place it between a pair of swages or “prints"-
either worked in a steam hammer, eccentric press, or by any other suitable means,
and compress the bolster while hot into the indentations, at the same time
printing" the bolster into the desired shape. The contraction of the bolster when
cooling gives it additional security.
"1
In the smaller class of chisels and gouges the indentations may not be necessary,
in which case I drive the bolster down the tapered shank to the required position
by suitable tools, such as a hollow drift.
In the accompanying sheet of drawings Fig. 1, is a Chisel A is the tang, B B are
the indentations. Fig. 2, is the bolster. Fig. 3. shows the smaller class of chisel
with a boster attached.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
The method of bolstering Chisels and Gouges substantially as hereinbefore
described and illustrated.