Improvements in Guards for Circular Saws and the like.
Year: 1898

page_text: Date of Application, 30th Aug., 1898-Accepted, 5th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in Guards for Circular Saws and the like.
I, GEORGE COUZENS of 14, Tudor Street, Cardiff, Builder, 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 for improvements in guards for circular saws and the like has
for its object an improved arrangement whereby the guard is automatically re-
moved from the saw as the work is approached thereto, so that while actually
cutting the saw is protected, the guard returning to its protecting position after
the work has passed, and consists essentially in forming the guard in several por-
tions pivoted on a suitable stand over the saw, the said portions being so connected
one with the other that as the work is approached to the saw, the said portions
of the guard are raised sufficiently to allow the work to pass as the saw cuts
through it, the portions of the guard afterwards falling back into their protecting
positions.
In order more clearly to describe this invention reference is had to the accom-
panying sheet of illustrative drawings in which Fig. 1 is an elevation showing
part of a circular saw bench fitted with a guard according to this invention and
Fig. 2 is a plan of the same. Fig. 3 shows a slightly modified arrangement.
The guard is formed of several portions ABC pivoted at ab upon a support or
stand D. The portion A of the guard is formed somewhat as shown in order to
protect the edge of the saw in the working position and is provided with a pin a¹
which works in a slot 6' formed in the portion B of the guard. This portion B is
pivoted so as to protect the upper portion of the saw, and fits partly within the
portion A of the guard. The third portion C of the guard is also pivoted at b
and protects the rear portion of the saw. The support or stand D is mounted on
the table E and is provided with arms D1 D2 at the ends of which the pivots a b
are arranged.
As
Normally the parts are in the position shown in full lines on the drawing so that
the saw is protected for almost the whole of its periphery above the table E.
When, however, the work to be cut is slid along the table E towards the saw, it
first comes in contact with the lower end of the portion A of the guard and pushes
it forward until the saw edge is exposed and begins to cut into the wood.
the saw makes its way through the wood, the portion A is pushed further back-
wards and upwards to allow the work to pass. During this movement the pin a¹
slides in the slot b¹ and causes the portion B to rise also. It will thus be seen
that as the work is moved forward the portions A and B of the guard are moved
out of the way an amount depending on the thickness and size of the work the
saw edge only being unprotected while cutting and the removing of the guard
being effected by the work itself. When the work has passed, the portions A and

page_text: B fall back to their normal positions by their own weight or springs may be
fitted to effect this, if such should prove to be necessary. If the work is suffi-
ciently large to necessitate the removal of the rear portion of the guard, the por-
tion is also lifted out of the way and then falls back by its own weight to the
protecting position.
On the drawings the positions occupied by the several portions of the guard
when raised by the work are indicated by broken lines.
By this arrangement the portions ABC of the guard can be raised to such a
height that the whole of the saw can be used for cutting purposes. If however
it is desired that the portion A be moved some distance before the portion B is
raised, slots may be formed in the portion A with which a pin on the portion
gears so that the portion B B is not acted on until the pin comes in contact with
the end of the slot. Similarly, slots may be formed in the portion. B within
which the pivot 6 slides.
A riving bar may also be provided at the rear of the saw under the portion C
of the guard.
In order to allow for variously sized saws, the arms D1 D2 carrying the pivots a b
are not rigidly mounted on the support or stand D, but are secured thereto by
means of the screwed portion d' sliding in the groove d and the nut d³. The
height of the arms D¹² can therefore be varied according to the size of saw in
use.
"
In the modified arrangement shown in Fig. 3 the general arrangement is sub-
stantially the same as that described above, but the portion B of the guard instead
of being pivoted at 6 is pivoted at + to the portion A and is formed with a hook-
shaped end 2 adapted to engage over the pivot pin b. It is also formed with a'
curved edge b which slides on the pivot pin b. As the work is approached
to the saw, the portion. A is caused to rise and the portion B is also caused to rise,
the edge 63 sliding on the pivot pin b until it assumes the position indicated in
broken lines. After the work has passed the portion A returns to its normal
position and the portion B also returns until the hook shaped end 62 again engages
over the pivot pin b.
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:-
(1) A guard for circular saws and the like, consisting of several pivoted por-
tions protecting different parts of the saw, the said portions of the guard being
connected one with the other, so that as the work is approached to the saw they
are moved sufficiently to allow it to pass as the saw cuts through it and afterwards
return to their protecting positions, substantially as described.
(2) A guard for circular saws and the like, consisting of the portion A pivoted
at a and adapted to protect the working portion of the saw, the portion B pivoted
at 6 and adapted to protect the upper portion of the saw, the said portion B
having a groove b₁ with which a pin al on the portion A engages, and the por-
tion pivoted at b and adapted to protect the rear portion of the saw, the said
portions A B C being so arranged that as the work is approached to the saw they
are raised sufficiently to allow it to pass as the saw cuts through it and afterwards
return to their protecting positions substantially as described with reference to
Figs. 1 and 2 of the drawings.
(3) A guard for circular saws and the like, consisting of the portion A pivoted
at a and adapted to protect the working portion of the saw, the portion B pivoted
to the portion A at b and adapted to protect the upper portion of the saw, the
said portion B having a hook shaped end 62 which engages with the pivot pin b,
and a curved edge 63 which slides on the said pivot pin b, and the portion C
pivoted at band adapted to protect the rear portion of the saw,
the said por-
tions A B C being so arranged that as the work is approached to the saw they are

page_text: aised sufficiently to allow it to pass as the saw cuts through it and afterwards
return to their protecting position substantially as described, with reference to
Fig 3 of the drawings.
1 1.
1
J
1900
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.