Improved Means for Sharpening Saws.
Year: 1894

page_text: Date of Application, 12th Oct., 1894
Complete Specification Left; 12th July, 1895-Accepted, 17th Aug., 1895
PROVISIONAL SPECIFICATION.
Improved Means for Sharpening Saws.
WILLIAM ELI PLESTED' 13 Rose Cottage, Grover Road Watford Herts,
Joiner. I do hereby declare the nature of this invention to be as follows:-
My invention has for its object to provide a ready and efficient means, for
sharpening saws. In sharpening saws a great difficulty has always been found,
in keeping the teeth regular and of equal size. My invention will overcome this
difficulty enabling inexperienced persons to properly sharpen saws a process which
has hitherto required great skill and practice and in a much shorter time. A
sharpening machine constructed according to my invention consists essentially of a
worm or thread: The thread or worm is made of a size to correspond with the
size of tooth of saw to be sharpened it is then file cut & mounted so as to be
capable of being rotated, and of a suitable means, for holding the saw in position
whilst being sharpened.
L
.600.
Improved Means for Sharpening Saws..
I, WILLIAM ELI PLESTED late of 13 Rose Cottage, Grover Road and now
of 37, Grover Road, Watford, in the County of Herts, Joiner, 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 :-
1
My invention relates to sharpening saws of every description, the object being
to provide a ready and efficient means whereby such tools may be properly
sharpened in less time than at present and without any skill or previous practice
on the part of the operator. It also overcomes the difficulty which has hitherto
been experienced in keeping the teeth of the same perfectly regular and of
equal size.
According to this invention my machine or apparatus for sharpening saws consists
essentially of a spiral or helical thread or worm formed or fixed upon a spindle,
the said spindle being mounted in suitable standards or bearings and provided with
a handle, pulley, belt, strap or other equivalent mechanical means of imparting a
rotary motion to the said spindle.
The said thread or worm may consist either of steel, stone, emery or any
combination of materials suitable for grinding or sharpening purposes and may
be file-cut, serrated, roughed or otherwise suitably prepared so as to obtain the
"bite
required
" on the saw.
The spindle together with the spiral or helical file, handle and bearings are
mounted on a bed or base-plate, suitable means being provided for fixing the saw
in position during sharpening.
.

page_text: "
Referring to the accompanying drawings
1
Figure is a side elevation, Figure 2 a plan view of a machine constructed
according to my invention, and
Figure 3 two views of the helical file or grindstone which constitutes the essence
of my invention.
In the accompanying drawings a circular saw is shown in position ready to be
sharpeued. The saw a is placed over a conical bush or carrier b, which is itself
fixed to a guide pin e' capable of vertical adjustment in the slot in the guide
bracket c.
The saw is also capable of lateral adjustment by means of another
slotted guide bracket d similar to that shown at c.. The saw having been adjusted
and fixed over the helical file or grindstone at the latter is caused to revolve by
means of the handle e, and mitre-wheels e', e, and at the same time the helical
worm automatically causes the saw to travel, thus enabling the teeth of the latter
to be successively operated upon.
The file or grindstone a resembles a large screw, having a regular pitch to
correspond with the size and pitch required to be given to the teeth of the saw.
In sharpening an ordinary flat straight saw, such for instance as a tenon-saw,
the conical bush or carrier 6 and guide bracket c d may be dispensed with and the
Baw teeth find a resting place on the small rollers s, as shown in the drawings,
the position of the saw being indicated in dotted lines.
ווי
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim' is :-
1. A machine or apparatus for sharpening saws constructed and operated
substantially as herein described and set forth.
"
64
.or worm
" of
2. For sharpening saws the use of a spiral or helical "thread'
steel, stone, emery or any combination of materials suitable for grinding or
sharpening purposes which may be either file-cut, serrated, roughed or otherwise
suitably prepared substantially as herein set forth..
3. In the improved means herein before described for sharpening saws the
combination with the worm referred to in the previous claim of suitable apparatus
consisting of a spiral or helical worm or cutter, an axle, suitable mitre wheels,
cranked handles, and slotted brackets all for the purpose specified.
Dated this 12th day of July 1895.
For T. B. BROWNE, LIMITED,
Agents,
BENJ: T. KING,
Registered Patent Agent.