Improvements in Guards for Circular Saws.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Guards for Circular Saws.
I, THOMAS DUNCAN, of 305, Manchester Street, Oldham, in the County of Lan-
caster, Mechanical Engineer, do hereby declare the nature of this invention to
be as follows:
I propose using the ordinary fence as at present fitted on for circular saw
use, I propose
benches, and in the case of circular saw benches, already in
fitting said fence with a bracket, in whatever manner, it is most convenient to
be fixed for the holding of said guards: said bracket to be made with a boss, on
the top end of said bracket, said boss to be set square from the face of circular
saw, fence, in every way and I propose boring a hole, in the centre of said boss,
parallel with the top of saw bench, and square with said saw, fence: said boss
to be fitted with a set screw, a straight pin going down one side of hole in
boss, projecting only in part in the inside of hole. In the case of new saw
benches I propose casting the above on, in connection with the fence for said
circular saw.
And, I propose, making guard proper, in the following way; first, I get a
shaft, and fits it into boss, on the top of saw fence: said shalf to have grooves,
turned into it, corresponding with the pin fitted in the side of hole in said boss,
and arranged so that the shaft can be shifted out, or in, according to the distance
of fence from saw; by taking out the said pin, and shifting said shaft, either
backwards or forwards, as may be required; placing pin in hole to keep shaft in
position, and at liberty to move in a circular direction as required: the other
end of shaft is flattened so that the guard proper, can be bolted to the end of said
shaft, so that it can have an easy motion, up or down, according to the thickness
of the material that is being operated on, and I propose bending guard to the
circle of saw that it has to protect, the one end fastened to the flattened end of
shaft that works in boss on the top of saw fence, and the other end of bent guard,
to rest free on top, of saw bench, and I propose toothing the extreme end, that
rests on the saw bench at the back of the saw, so that it will prevent anything,
being pushed along the saw, from coming back, and getting in contact with the
saw from behind. In cases where different diameters of circular saws have to
be used, I propose making holes in guard, at different distances, the same as holes
for saw guard at extreme end so that it can be shifted out or in, to suit different
sizes of saws, and I also propose providing brackets on back of guard proper, with
slots so that said guard can be lowered or raised according to the different sizes
of saws in use.
1
1000

page_text: improvements in Guards for Circular Saws.
THOMAS DUNCAN, 305, Manchester Street, Oldham, Lancashire, Mechanical
Engineer, 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:-
I propose making guard for circular saws of wood, A 2, or iron, mounted with
two brackets, one bracket for holding cleaving knife, the other for holding guard
as shown in drawings.
B, B, represents circular saw in saw bench A, Figs. 1 & 3, represents circular
cleaving knife, made wedge-shaped, which is fitted with a shaft for it to revolve
on; the one end of shaft has a link, fastened to it, which moves up and down,
with circular cleaving knife, and is used for fastening same to bracket, attached
to back end of guard marked C behind saw.
D represents guard with a bracket fixed on top, of guard, as shown, having
an oblong hole in it, and fits on to an angled bracket H, the one end of which
is used for carrying guard, and guard can be moved in or out, or removed
altogether by loosening set screw K in bracket for fastening said guard.
Back view of said guard shows cleaving knife, marked A, Fig. 2, and way of
adjusting it. This cleaving knife shown in back view, can be turned up or down,
and the end of cleaving knife can be fastened (by means of an oblong hole in
slotted end of cleaving knife) to a bracket, attached either to saw bench, or saw
bench pocket, on to the bottom side, and removed to whatever position required.
B, shows circular saw, C shows saw guard in an elevated position, E, shows bracket
as attached to saw fence for holding one end of angled iron bracket, which
has an oblong hole in it, to admit of guard being fixed at any height required,
and is fixed with set screw same as shown on bracket on top of guard.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
-
1st. The improved apparatus, consisting and combined substantially as described
with reference to the accompanying drawings, and operating as and for the
purpose above specified.
2nd. A circular saw guard made of wood and mounted as shown and described.
3rd. Attaching saw guard to common fence for circular saws.
Date : 31
1000