IMPROVED APPARATUS FOR PREPARING SAWS
Year: 1860

page_text: LETTERS PATENT to Edmund Hunt, of Glasgow, in the County of Lanark,
North Britain, Consulting Engineer and Patent Agent, for the
Invention of "IMPROVED APPARATUS FOR PREPARING SAWS."-A commu-
nication from abroad by Theodor Andreas Prale, residing at Hamburgh.
Sealed the 26th February 1861, and dated the 19th September 1860.
PROVISIONAL SPECIFICATION left by the said Edmund Hunt at the
Office of the Commissioners of Patents, with his Petition, on the 19th
September 1860.
I, EDMUND HUNT, of Glasgow, in the County of Lanark, North Britain,
Consulting Engineer and Patent Agent, do hereby declare the nature of the
said Invention for "IMPROVED APPARATUS FOR PREPARING SAWS," a communi-
cation to me from abroad by Theodor Andreas Prale, residing at Hamburgh
(to be as follows) :-
This Invention relates to the preparing of saw blades in such a way as
to reduce inequalities in the thickness, and obtain increased smoothness,
whereby the saw is rendered more efficient and less wasteful, particularly in
cutting veneers. This apparatus consists of a bench contrived to support and
guide a slide or carriage upon which the saw blade is stretched. At about
the middle of the bench, there is fixed an adjustable chisel holder, in which
a chisel is accurately adjusted and secured in a position to act on the upper
surface of the saw blade. The saw blade passes between the cutting edge

page_text: of this chisel and a narrow transverse steel bed piece, capable of adjustment
in height by a transverse movement in slightly inclined grooves. The saw
slide or carriage is provided with a rack on its under side, in gear with which
there is a pinion on a shaft with a handle, and by turning this last the saw
blade is drawn forcibly through between the steel bed piece and chisel, the
latter removing any excesses in the thickness. The chisel acts on a narrow
strip at a time and is shifted across between each stroke until the entire
width of saw blade is thus gauged.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Edmund Hunt in the Great Seal Patent Office on the 18th
March 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDMUND
HUNT, of Glasgow, in the County of Lanark, North Britain, Consulting En-
gineer and Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Nineteenth day of September, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-fourth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Edmund Hunt, Her special licence that I, the said Edmund Hunt,
my executors, administrators, and assigns, or such others as I, the said
Edmund Hunt, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 "IM-
PROVED APPARATUS FOR PREPARING SAWS," a communication to me, the said
Edmund Hunt, from abroad by Theodor Andreas Prale, residing at Hamburgh,
upon the condition (amongst others) that I, the said Edmund Hunt, my
executors or administrators, by an instrument in writing under my, 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 I, the said Edmund Hunt, do hereby declare the
nature of the said Invention, and in what manner the same is to be per-

page_text: formed, to be particularly described and ascertained in and by the following
statement in writing, reference being had to the accompanying Drawings, and
to the letters and figures marked thereon, that is to say:-
The said Invention relates to the preparing of saw blades in such a way
as to reduce inequalities in the thickness and obtain increased smoothness,
whereby the saw is rendered more efficient and less wasteful, particularly in
cutting veneers.
And in order that the said Invention may be properly understood and
carried into effect, I have hereunto appended a Sheet of explanatory Drawings,
representing an example of the improved apparatus.
Figure 1 is a side elevation, and Figure 2 is a transverse vertical section
of the apparatus, which in this example consists of a bench or massive wooden
frame comprising two end uprights or standards A, connected by a pair of
horizontal tie bars B, and supporting a pair of shears C, connected at intervals
by cross pieces D. Between the shears C there works a bar or stile E,
forming part of the frame upon which the saw blade F to be operated upon
is stretched. This bar E is on each side fitted with a projecting feather
or flange e, which feathers work in grooves formed for them in the inside
faces of the shears C, and the bar E is actuated by means of a rack 9, fixed
in a recess formed in its under side, there being in gear with this rack a
pinion G, fast on a spindle H, fitted with a handle I. The saw blade F is
stretched between a fixed crosshead J and an adjustable crosshead K, at the
opposite ends of the bar E, the lower ends of the crossheads being connected
by a tension rod L. At about the middle of the bench there is fixed
across the shears C a bed plate M, upon which a tool holder N can be
adjusted and fixed by means of screws, and in this tool holder N a chisel O
is accurately adjusted and secured in a position to act on the upper surface of
the saw F. The saw blade F passes between the cutting edge of the chisel O
and a narrow transverse steel bed piece P, capable of adjustment in height
to suit the gauge of the saw blade by a transverse movement in slightly
inclined grooves in the bed plate M, such adjustment being effected by means
of a screw. The several parts being adjusted the handle I is turned, whereby
the saw blade F is drawn forcibly through between the steel bed piece P
and the chisel O, the latter removing any excesses in the thickness. The
chisel acts on a narrow strip of the saw blade at a time, and is shifted across
between each stroke until the entire width of the saw blade is thus reduced
to a uniform gauge.
Having thus particularly described the said Invention, and the manner in
which the same is or may be used or carried into effect, I have to state that

page_text: I do not restrict myself to the precise details herein-before described or
delineated, but that what I claim as secured to me by the herein-before
in part recited Letters Patent is, the constructing or arranging of appa-
ratus for preparing or equalising saw blades, substantially as herein-before
described.
In witness whereof, I, the said Edmund Hunt, have hereunto set my
hand and seal, this Sixteenth day of March, in the year of our Lord
One thousand eight hundred and sixty-one.
EDMUND HUNT. (L.S.)