Year: 1897

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Law Officer of the 22nd day of August 1898.
I, HUGH JARDINE, of 21, George Street, in the Town and County of Ayr, Mason,
do hereby declare the nature of my invention to be as follows:-
This invention has reference to and comprises improvements in stone cutting
tools for hand use by masons which will render such tools more efficient and
durable than as commonly constructed, and these tools would be formed as hand
tools carrying separate and interchangable cutting bits.
As applied to stone cutting tools fitted with plain edged cutting bits the im-
provements consist in forming the handle part somewhat in the shape of an
ordinary broad edged chisel but the broadened end would be checked or stepped
and made as a plate only about one half the thickness. A rectangular plate would
be formed to fit the checked part and one or more longitudinal slots having bevelled
edges all round would be formed through this plate and corresponding slots
would also be formed through the fixed plate. The cutting bit would be
a rectangular plate pierced with holes to coincide with those in the two plates
and this bit being placed between the plates these would be tightly secured together
by small bolts and nuts, the heads and nuts fitting into the bevelled edges of the
slots. The loose plate may be slightly curved to give it a spring holding action
and it may have projections at its sides to enter recesses in the fixed plate to further
steady it in its position. This arrangement enables the cutting bit to be drawn
further out as it wears and also to be reversed when one side is worn out.
When cutting bits are used having multiple cutting edges these would be
formed not serrated but with a series of long parallel teeth having spaces between
for dust and small fragments to pass through when working, and these teeth
would be formed on each side of a plate and could be secured in the handle
part as described the securing bolts passing between the teeth. Preferably how-
ever they would be formed with a transverse bar across the centre of each side to
form a rest and be secured within a handle part formed with a fixed and loose plate
similar to the one described the outer edges of which may be checked to receive
and support the bit by its transverse bars.
The loose plate would preferably have its inner edge bevelled to enter an angled
recess in the fixed plate to which it would be secured in position to hold the cutting
bib by a screw by means of which they would be tightened up together.
Dated the 27th day of February 1897.

page_text: Improvements in Stone Cutting Tools.
I, HUGH JARDINE, of 21, George Street, in the Town and County of Ayr, Mason,
do hereby declare the nature of my invention and in what manner the same is w
be performed to be particularly described and ascertained, in and by the following
statement, that is to say:-
This invention has reference to and comprises improvements in stone cutting
tools for hand use by masons, which will render such tools more efficient and
durable than as commonly constructed, and these tools would be formed as hand
tools carrying separate and inter-changable cutting bits.
And in order that my invention may be properly understood, I have hereunto
appended a sheet of explanatory drawings in which various modifications are
illustrated.
Referring to Figures 1, 2, and 3 of the drawings which are respectively a front,
back, and edge view partly in section, illustrating my improvements as applied
to stone cutting tools fitted with plain edge cutting bits, these consist in forming
the handle part A somewhat in the shape of an ordinary broad edged chisel but
the broadened end is checked or stepped and made as a plate A* of only about one
half the thickness. A rectangular plate A¹ is formed to fit the checked part and one
or more longitudinal slots A³ having bevelled edges all round are formed through
this plate A and corresponding slots A³ are also formed through the fixed plate A*.
The cutting bit B is a rectangular plate pierced with holes B¹ to coincide with
those in the two plates A* and A' and this bit B is placed between the plates
which are tightly secured together by small bolts or screw nails C and nuts D
on each side, the heads of the bolts and the nuts fitting into the bevelled edges of
the slots A2, A3. The loose plate may be slightly curved to give it a spring holding
action and it may have projections A* as indicated, at its sides to enter recesses in
the fixed plate A to further steady it in its position. This arrangement enables
the cutting bit to be drawn further out as it wears and also to be reversed when
one side is worn out.
When cutting bits are used having multiple cutting edges or teeth these are formed
as shown in Figure 4, not serrated but with a series of long approximately parallel
teeth having spaces between for dust and small fragments to pass through when
working, and these teeth would be formed preferably on each side of a plate and
could be secured in the handle part as described the securing bolts C passing
between the teeth. Preferably however they are formed, as shown, with a trans-
verse bar across the centre of each side to form a rest and are secured within
a handle part A formed with fixed and loose plates A* and A¹ similar to the one
described all as shown in Figures 6 and 7 the outer edges of which may be checked
to receive and support the bit by its transverse bar b.
Otherwise the cutting bit may be formed with one set of teeth as shown in
Figure 5 and have the solid edge bevelled on both sides as at 61 to form a dove-
tailed joint with the handle part as shown broken away in Figure 8.
The loose plate A¹ preferably has its inner edge bevelled to enter an angled
recess in the fixed plate or handle part A to which it is secured in position to
.hold the cutting bit by a screw or screws C by means of which they are tightened
up together.
Cutting bits with plain cutting edges may be formed also with transverse bars b
in the same manner as the toothed varieties as shown in Figure 9.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed. I wish it to be understood
that I am aware that it has been previously proposed to use reversible cutting
bits with a transverse supporting bar or ridge on each side and cutting bits with
long and approximately parallel teeth, and to construct a stone dressing tool with
a fixed jaw and a removable plate or jaw for holding cutting bits and also to
secure cutting bits in holders by bolts and nuts and screws, and that I do not claim
these as my invention but: I declare that what I claim is :-
:-
First. In a stone cuting tool formed with fixed and moveable plates and cutting
bit all secured together by screws and nuts all substantially as herein described
and illustrated by Figures 1, 2, and 3 of the accompanying drawings, the use of
the slots with screws and nuts substantially as described and shown.
Second. In stone cutting tools formed with fixed and moveable plates and cutting
bits all secured together by screws all substantially as herein described and
illustrated by Figures 5 and 8 of the accompanying drawings, forming the cutter
dovetailed in section and the handle part to correspond substantially as described
and shown with reference to Figures 5 and 8.
The 20th Naomh 1007
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.