IMPROVEMENTS IN SAWS FOR CUTTING SLATE, STONE, IRON, OR OTHER METALS OR MATERIALS
Year: 1869

page_text: LETTERS PATENT to John Parry, Slate Quarry Manager, and Richard
Morris, Mechanic, both of Cambrian Slate Works, Llanberis, in
the County of Carnarvon, North Wales, for the Invention of
"IMPROVEMENTS IN SAWS FOR CUTTING SLATE, STONE, IRON, OR OTHER
METALS OR MATERIALS."
Sealed the 2nd October 1869, and dated the 10th April 1869.
PROVISIONAL SPECIFICATION left by the said John Parry and
Richard Morris at the Office of the Commissioners of Patents,
with their Petition, on the 10th April 1869.
We, JOHN PARRY, Slate Quarry Manager, and RICHARD MORRIS,
Mechanic, both of Cambrian Slate Works, Llanberis, in the County of
Carnarvon, North Wales, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN SAWS FOR CUTTING SLATE, STONE, IRON, OR
OTHER METALS OR MATERIALS," to be as follows:-
These improvements in saws for cutting slate, stone, iron, or other
metals or materials of ordinary thickness consist of three separate plates
of iron forming the saw disc, rivetted or otherwise fixed together, in

page_text: the middle plate of which grooves are cut for the purpose of fixing in the
steel cutters, and which are held tight in their proper position by springs
attached to the side of the saw or by other means of fixing the same.
There are also narrow grooves or channels in the centre for the escape
of a get of water to each tooth or cutter, which water is communicated to
the central hole of the saw through the saw shaft or spindle, which must be
hollow for that purpose. The water is intended for the purpose of clearing
away the dust, keeping the cutters cool and in proper temper. The saw disc
may also be otherwise formed than with the three plates, as by having
one plate the thickness of the two first, and recessing the mortices or
socket chambers in the solid plate, and then adding a second plate to
cover and form the last side of the teeth, mortices, and the water grooves,
and any other mode of construction in the way of conducting water up the
saw disc from the centre of the circumference. The said saw will work
in the ordinary saw tables now in use.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Parry and Richard Morris in the Great Seal
Patent Office on the 9th October 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
PARRY, Slate Quarry Manager, and RICHARD MORRIS, Mechanic, both
of Cambrian Slate Works, Llanberis, in the County of Carnarvon, North
Wales, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Tenth day of April, in the year of
our Lord One thousand eight hundred and sixty-nine, in the thirty-
second year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said John Parry and Richard Morris, Her
special licence that we, the said John Parry and Richard Morris, our
executors, administrators, and assigns, or such others as we, the said
John Parry and Richard Morris, our executors, administrators, and
assigns, should at any time agree with, and no others, from time to
time and at all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN SAWS FOR CUTTING

page_text: SLATE, STONE, IRON, OR OTHER METALS OR MATERIALS," upon the condition
(amongst others) that we, the said John Parry and Richard Morris,
our executors or administrators, by an instrument in writing under
our, or their, or one of their hands and seals, should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said John Parry and Richard Morris,
do hereby declare the nature of our said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, that is to say :-
These improvements in saws for cutting slate, stone, iron, or other
metals or materials of ordinary thickness consist of three separate
plates of iron forming the saw disc rivetted or otherwise fixed together,
in the middle plate of which grooves are cut for the purpose of fixing in
the steel cutters, and which are held tight in their proper position by
springs attached to the side of the saw or by other means of fixing the
same. There are also narrow grooves or channels in the centre for the
escape of a jet of water to each tooth or cutter, which water is com-
municated to the central hole of the saw through the saw shaft or
spindle, which must be hollow for that purpose. The water is intended
for the purpose of clearing away the dust, keeping the cutters cool and
in proper temper.
To make our Invention more fully understood we now describe it by
reference to the accompanying Drawings.
Figure 1 is a cross section of saw taken on line of water channel B, B, B,
Figure 3; Figure 2 is a part cross section taken through cutter on the
line A, A, A, Figure 3; Figure 3 is a side view of saw with one of the
outer plates partially removed.
In these Figures a, b, c, show respectively the three plates fixed
together by rivits x, x, and forming the disc of the saw, which is fixed
on its spindle or axis d by the nut e and clamp plates ff, the spindle
working in bearings attached to the saw bench in the usual manner, one
of which is partly shown at g, Figure 1. The two outer disc plates a, c,
are bored to fit on the spindle or axis d, but the central plate b has a
hole larger than the spindle, thus leaving the space h, Figures 1 and 3,

page_text: all round it. In the plate 6 are formed radiating water grooves i, i, running
from the space h to the periphery of the disc, and curved so that a jet
of water may be directed against the face of each cutter K, K. At the
periphery of the central plate 6 are formed mortices to receive the lower
end of each cutter K, which is thinned down to pass between the outer
plates a, c, the peripheries of these latter plates having also mortices
to take shoulders formed on the cutters K, K. The cutters are kept
in position by means of springs j, j, fitted into slots formed in the outer
plate c and fixed to the disc by the screws 1, 1. On each spring is
formed a projecting tooth m, Figure 2, which enters a suitable slot n
formed in the cutter K, the face of the tooth towards the centre of the
disc being flat so as to keep the cutter firmly in position, and the opposite
side of tooth rounded so as to allow the lower part of the cutter to push
the spring outwards when it is passed into its place, also to allow of
the tooth being withdrawn so that the cutters may be removed readily
from the disc for grinding or any other purpose.
Figure 1 also shows a mode of forming the water connection. The
end of the spindle d is screwed as shown at o to take a coupling piece q,
which connects the water supply pipe p with the said end. The hole r
is bored up the centre of the spindle till it meets a hole & bored across
it and communicating with the space h, whence the water is conducted
along the radiating and curved grooves i, i, to the face of each
cutter K, K.
Figures 4 and 5 show respectively an elevation and a plan of a saw as
before described fitted to an ordinary bench for cutting slate. S is the
saw fixed on spindle d working in bearing g and driven by steam or
other convenient power, and having the water connection to end of spindle
through the supply pipe p led from a convenient source; K, K, show
the cutters of the saw; T, the saw bench; V, the moveable table
carrying the block W to be cut which is fed up against the cutters K, K,
in the usual way. The saw disc may be otherwise formed than with the
three plates, as by having one plate the thickness of the two first and
recessing the mortices or socket chambers in the solid plate and then
adding a second plate to cover and form the last side of the teeth
mortices and the water groove, and any other mode of construction
in the way of conducting water up the saw disc for this and the above
fully described saw from the centre to the circumference can be
used.

page_text: Having now described and particularly ascertained the nature of
the said Invention, and the manner in which the same is or may be
carried into effect, we must observe that we do not restrict ourselves to
the precise details above described, as many variations may be made
therefrom without deviating from the main feature of the Invention;
but what we claim is, the three plates rivetted or otherwise fixed together
with water channels to allow of a jet of water to be directed on the face
of each cutter and mortices to receive the said cutters, and in the general
arrangement and construction of a saw, substantially in the manner and
for the purposes herein-before described and shewn in the accompanying
Drawings.
In witness whereof, I, the said John Parry, have hereunto set
my hand and seal, this Seventh day of October, in the year
of our Lord One thousand eight hundred and sixty-nine.