Improvements in Fret-saws.
Year: 1888

page_text: Date of Application, 22nd Oct., 1888
Complete Specification Left, 20th July, 1889-Accepted, 24th Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in Fret-saws.
I, ALEXANDER BRADLEY, of 22, Marlborough Road, Hightown, near Manchester, in
the County of Lancaster, Warehouseman, do hereby declare the nature of this
invention to be as follows:-
:-
This invention relates to fret-saws used in the. sawing or cutting out of ornamental
patterns in wood, bone, ebonite or such like compositions.
Hitherto such saws have been made with only one cutting edge that is, with
teeth running down the edge of a piece of flat steel, and. in using these saws it has
been found inconvenient to turn the material operated upon.
The object of my invention is to provide a saw the use of which will enable the
operator to turn the material operated upon in any direction without straining, the
saw more than is necessary for the cutting of the material.
In carrying out my invention I select a piece of flat steel of the usual length and
width, and form on one edge thereof teeth, I then heat the steel and twist it, thereby
obtaining a saw whose teeth run spirally round the piece of steel, and by the use of
which the material being operated upon may be turned in any direction at the will
of the operator.. After twisting the saw, it is hardened and tempered in the usual
manner.
th d of October 1888
WM. P. THOMPSON & Co.,
Per William H. Taylor,
6, Bank Street, Manchester, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Fret-saws.
I, ALEXANDER BRADLEY, of 22 Marlborough Road, Hightown, near Manchester,
in the County of Lancaster, Warehouseman, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention relates to saws used in the sawing or cutting out of ornamental
patterns in wood, bone, ebonite, or other material.
Hitherto such saws have been made with one cutting edge, that is with the teeth
In use these saws will cut in
running down the edge of a thin piece of flat steel.
but one direction, and it is at times inconvenient to turn the material or to turn the
saw in the direction of the pattern, and such turning always causes more or less strain
upon the saw.
The object of my invention is to provide a saw which will cut in any direction,
and which in use the operator will not have to turn in following every curve of the
pattern, and any turning of the material required by the operator will be done
without twisting the saw or straining it more than is necessary for the cutting of the
material.
The invention consists essentially of a saw provided with cutting teeth on every
side, formed by cutting the teeth on a piece of saw steel in the usual way and the
twisting the same into a spiral.
The invention will be fully described by aid of the accompanying drawing, in which
a fret saw made in accordance with my invention is shown."
The
A is a piece of flat steel of the usual form, cut with teeth a, on one edge.
steel is prepared and the teeth cut in the usual manner, it is then heated and twisted

page_text: into the form shown, the teeth running spirally round the blade of steel.
hardened and tempered to the required degree.
16 15
The twisting may be done in any suitable machine in which the blade can be
clamped at both ends, one being slowly turned round while the other remains
stationary.
The saw shown in the drawing has the teeth cut upon one edge of the flat piece of
steel. In order to increase the number of teeth both edges may be cut with teeth so
that when completed the teeth would form a double spiral.
When in operation the saw will cut in either direction or the saw and the material
may either be turned relatively to the other without putting any torsional or twisting
strain upon the saw.
Such saws work more freely than those at present in use, they do not choke or stick
fast in turning an acute angle.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
-
1. A fret saw formed from a flat piece of steel cut with teeth on one or both edges
and twisted into a spiral, substantially as described.
2. A fret saw having the teeth running spirally round the blade of steel, substan
tially as described.
CA. 1990
Dated this
21st day of May
1880
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.