Improvements in or relating to Guards for Circular Saws.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Guards for Circular Saws.
I, THOMAS LONGMORE, of 75, Darlington Street (E), Wigan, Lancashire, Sawyer,
do hereby declare the nature of this invention to be as follows;
-
This invention has for its object a guard which can be applied to a circular saw
bench so that it will act as a guide for any saw that may be fixed in the bench.
The guard itself consists of two steel blades working on a centre which is adjust-
able so as to be brought down to immediately above the saw. The two blades are
connected together by a nut and bolt through a hole near their bottom.
A second
nut and bolt passes through a slot above this hole in each blade and an adjustable
stop can be placed at the back so as to only allow the bolt to travel to a given point
in the slots or the bolt can be tightened very tight in the slots and thus all move-
ment prevented. One of the blades is exactly over the saw and bends down at the
back of the saw to the table or below the table or nearly down to the table. The
other blade is placed a trifle in front of the saw and bends down as far as desir-
able, but has to end at a point considerably above the table in order to allow the
blocks of wood to pass beneath it. The bolts before mentioned preferably pass
through a bracket at the end of a vertical spindle and this spindle passes through
a bracket at the end of a horizontal spindle. This spindle passes again through
a socket on a vertical standard on the saw frame. By means of these horizontal
and perpendicular bars the ends of which pass through sockets and are secured
by set screws the two blades can be lowered or raised so as to come exactly &
immediately above the saw and their distance horizontally from the standard can
also be arranged. Further even if the saw were moved in the frame sideways
the socket could swivel on the standard and thus they could be placed in any posi-
tion that may be required and fastened with set screws.
Dated the 26th day of October 1898,
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
Improvements in
I, THOMAS LONGMORE, of 75, Darlington Street (E), Wigan, Lancashire, Sawyer,
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 follow-
ing statement:-
This invention has for its object a guard which can be applied to a circular saw
bench, so that it will act as a guide for any saw that may be fixed in the bench.

page_text: The invention will be understood from the following description, reference
being had to the accompanying drawings, in which,
Figure 1 is a view of the guard in use.
Figure 2, the same guard turned aside out of the way of the circular saw;
Figure 3, a slight modification.
The guard itself consists of two steel blades A and B, working on a centre C
which is adjustable so as to be brought down to immediately above the saw D.
The two blades A & B are connected together by a bolt and nut through a hole C.
A second nut and bolt passes through a segmental circular slot E above this hole
in each blade, and the ends of this slot form a stop so as to only allow the bolt to
travel to a given point and the bolt can be tightened very tight in the slots E and
thus all movement prevented. The back blade A or riving knife is exactly over
the saw D in a vertical plane therewith, and curves down at the rear edge of the
saw to the table For below the table or nearly down to the table. The other
blade B is placed a trifle in front of the face of the saw D and bends down as
far as desirable, but has to end at a point considerably above the table F in order
to allow the timber G to pass under it. The bolts before mentioned are prefer-
ably supported by a frame or bracket comprising a vertical spindle H through
the end of which the bolts pass, and this spindle H passes through a socket at the
end of the horizontal spindle I. This spindle I by means of a socket is secured on
the vertical standard Jon the saw frame. By means of these horizontal and per-
pendicular bars, the ends of which pass through the sockets and are secured by set
screws, the blades A and B can be lowered or raised, so as to come exactly and
immediately in proximity to the saw D, and their distance horizontally from the
standard can also be adjusted. Even if the saw were moved in the frame sideways,
the socket could swivel on the standard J, and thus the blades can be placed in
any position that may be required and fastened by set screws, or they can be
turned completely out of the way, as shown in Figure 2, when it is required to
repair the saw teeth. Further the slot E enables the blades to be adjusted to suit
any given diameter of saw. The arm I preferably fits into a square socket, which
prevents the arm or the guard from twisting or getting the least degree out of
their places. The spindle H to which the guard is attached is also in a square
socket which prevents the guard from swivelling across the saw, and is kept lin-
able for any diameter of saw.
In Figure 3 the arrangement is similar, but both blades A and B are placed
a trifle in front of the saw face and both blades, ending at a point considerably
above the table in order to allow the timber to pass beneath them, act purely as
a guard for the protection of the workman. The blade A is however furnished
with a riving knife K or adjustable tail piece which curves down to the surface of
the table, its office being to enter the kerf and spread the boards cut by the saw.
In Figure 1 however the blade A, has the double office of acting as a guard and as
a riving knife.
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. The improvement in circular saw guards which consists in forming them of
two metallic blades mounted on a centre and held in immediate proximity to the
cutting edge of the saw so as to act as a shield, in combination with means for
binding and clamping the two blades together in any required position, substan-
tially as described.
2. The improved appliances or fittings for use in connection with circular saws
to protect the workmen from accident, consisting of a pair of metallic blades or
shields mounted on an adjustable centre one of which blades is held in a vertical
plane to that of the saw, and curves down at the rear to the saw table in such
manner as to serve as a riving blade as well as a shield, while the other acting
purely as a shield is placed a trifle in front of the saw face, and projecting down

page_text: in the opposite direction, ends at a point considerably above the table in order to
allow of the timber passing under it, substantially as described.
3. In a circular saw guard, the combination of two metallic blades or shields
mounted on a centre a trifle in front of the saw face, and ending at a point con-
siderably above the saw table so as to allow the timber to pass beneath, and a
riving knife or tail piece such as K secured to the rear blade for entering the keri
and spreading the boards cut by the saw substantially as described.
4. In a circular saw guard, the combination with two metallic blades or shields
mounted on a centre and held in proximity to the cutting edge of the saw, of a
bracket or frame to which said blades are secured, the said bracket being so
arranged as to enable the blades to be adjusted into any required position rela-
tively to the saw, or shifted out of the way altogether, substantially as described.
Dated this 21st day of June 1899.
WM. P. THOMPSON & Co.,
Patent Agents,
Of Liverpool, Manchester, Birmingham, and London.