Improvements in connection with Guards for Circular Saws.
Year: 1899

page_text: Date of Application, 9th May, 1899
Complete Specification Left, 1st Feb., 1900-Accepted, 17th Mar., 1900
Improvements in connection with Guards for Circular Saws.
We, ASA LEES AND COMPANY LIMITED, of Solo Iron Works, Oldham, in the
County of Lancaster, Machine Makers, and LUKE DUNKERLEY Junior, of the same
address, Foreman of Saw Mill, do hereby declare the nature of this invention
to be as follows:-
Our invention relates to improvements in connection with guards for circular
saws, and the chief object of our improvements is to protect the operative from
risk of accidental injury by the saw.
In carrying our improvements into effect we employ a suitable pillar secured
to the top of the saw bench, and to this pillar we secure an adjustable bracket
formed to cover the top and upper part of the side of the saw and capable of being
raised to any desired height and turned out of the way when not required.
To the front portion of this bracket is secured an adjustable arm to which is
pivoted a quadrant or other suitably shaped piece of wood, or wood and metal
or other suitable material, which is curved in front where it rests normally on
the top of the saw bench immediately in front of the saw blade. When a niece
of timber is fed up to the saw it first comes against and raises the front of the
quadrant which then rests upon the timber and remains there until the piece or
pieces of timber have passed the front of the saw when the quadrant falls imme-
diately and again covers the saw teeth and rests upon the bench until it is raised
by feeding another piece of timber to the saw.
The quadrant may be regulated in its movement for special requirements.
The riving knife is composed of a piece of sheet metal the lower portion being
curved to fit over the saw teeth, and the knife is secured in any convenient position
immediately behind the saw by an extension at its upper end in which several
holes are drilled one of these holes is placed over a stud in the bracket and the
riving knife is then secured adjustably by a bolt in a curved slot in the bracket
to suit various sizes of saws.
In a modification, particularly for sawing large timber, we may dispense with
the quadrant and in its place we hinge to the bracket a door or shutter which
opens outward and when in use rests upon the top or outer side of the timber being
cut.
The door might be hinged together in several parts so that when sawing thin
imber a small portion only at the bottom edge of the door need be turned up.
Dated this 8th day of May 1899
H. B. BARLOW & GILLETT,
Agents for Applicants.

page_text: Improvements in connection with Guards for Circular Saws.
We. ASA LEES AND COMPANY LIMITED, of Solo Iron Works, Oldham, in the
County of Lancaster, Machine Makers, and LUKE DUNKERLEY Junior, of the same
address, Foreman of Saw Mill, 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:-
Our invention relates to improvements in connection with guards for circular
saws, and the chief object of our improvements is to protect the operative from
risk of accidental injury by the saw
In carrying our improvements into effect we employ a suitable pillar secured
to the top of the saw bench, and to this pillar we secure an adjustable bracket
formed to cover the top and upper part of the side of the saw and capable of being
raised to any desired height and turned out of the way when not required.
To the front portion of this bracket is secured an adjustable arm to which is
pivoted a quadrant or other suitably shaped piece of wood, or wood and metal
or other suitable material, which is curved in front where it rests normally on
the top of the saw bench immediately in front of the saw blade. When a piece
of timber is fed up to the saw it first comes against and raises the front of the
quadrant which then rests upon the timber and remains there until the piece or
pieces of timber have passed the front of the saw when the quadrant falls imme-
diately and again covers the saw teeth and rests upon the bench until it is raised
by feeding another piece of timber to the saw.
The quadrant may be regulated in its movement for special requirements.
The riving knife is composed of a piece of sheet metal the lower portion being
curved to fit over the saw teeth, and the knife is secured in any convenient position
immediately behind the saw by an extension at its upper end in which several
holes are drilled; one of these holes is placed over a stud in the bracket and the
riving knife is then secured adjustably by a bolt in a curved slot in the bracket
to suit various sizes of saws.
In the accompanying six sheets of drawings-
Figure 1 is a side elevation of part of a saw bench and circular saw to which
our improvements are applied. Figures 2 and 3 are plan view and end view
respectively of the guard shown in Fig. 1.
Figures 4, 5 and 6 are similar views to Figs. 1, 2 and 3 illustrating an alternative
arrangement of the saw guard.
In the drawings,- designates part of the saw bench, the circular saw.
e a pillar secured to the top of the bench and keyed so that it cannot be turned:
in this pillar is secured a feather key which does not extend to its top, and
fitted on the pillar is a bracket e capable of being adjusted vertically to the
height required and then fixed by a set screw f: to the front portion of this
bracket is secured an, arm 9 and near the extremity of this arm is pivoted at g¹
a quadrant or curved piece of metal h. The quadrant is curved in front and covers
the teeth of the saw and near the lower end of the quadrant is preferably mounted
a conical anti-friction bowl i.
The quadrant is drilled with a number of holes, and a stud and bowl j is
placed in any hole in order to support the quadrant at any desired height, its
upward movement being facilitated by grooved howls carried upon the arm g.
To the front end of the bracket e is secured a bracket 7 slotted at its upper
end, and carrying an adjustable stud m: the riving knife is formed of a piece
of sheet metal, the lower portion being curved to fit over the teeth of the saw
and to rest in the slot in the bench top at the upper end of the knife are several
holes, one of which is passed over the stud m to suit the size of the saw, and when
adjusted, the knife is locked by a bolt o which passes through it and through
the slot in the bracket 1.

page_text: The alternative arrangement illustrated in Figs. 4, 5 and 6 is substantially the
same as that already described with reference to Figs. 1, 2 and 3 but we dispense
with the extension of the arm g for carrying the quadrant or, curved piece for
covering or guarding the front teeth of the circular saw, and we also dispense
with the corresponding portion of the quadrant and in this case the arm carries
four grooved bowls which form the guides for the curved piece has before
described.
In both of the constructions shown, it does not matter in what position the
bowl stands when a piece of timber is laid upon the bench and moved up toward
the saw to be cut, for as soon as the timber meets with the bowl i, it and the
curved piece h will be pushed backward and upward by the timber until the
bowl rests upon the top of the timber, thus at all times protecting the front of
the saw,
the top and part of the front of which is also protected by the bracket e
and arm g; as soon as the timber passes beyond the bowl the piece will fall
until supported by its bowl j on the arm or guide g. In the first arrangement
the curved piece h moves in the arc of a circle the centre of which is above the
timber and is the stud ; and in the second arrangement the curved piece h
moves through the same are guided by the bowls k.
The saw is in both arrangements always guarded whether cutting or not as the
curved piece h, which forms the front shield, only moves, upward sufficiently to
allow the timber to pass and consequently the part of the saw not buried in the
timber is protected by the said front shield which automatically moves downward
and resumes its lowest or safety position immediately after the timber has passed
and been cut.
To suit different sizes of saws the bracket e can be raised and lowered on the
pillar, and the arm can be adjusted horizontally by means of the bolts >>
which pass through holes in the bracket e and slots in the plate of the arm g:
and when it is desired to sharpen or change the saw the bracket e can be raised
to the top of the pillar above the key when it can be swung round with all
the parts attached entirely out of the way.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:
1. In a circular saw guard the arrangement use and application of a front shield
having its centre of movement above the timber to be cut on the saw bench
and so mounted that it will be automatically moved up in the arc of a circle
by the timber as it is traversed toward the saw sufficiently to allow the timber
to pass and will automatically resume its lowest or safety position after the
timber has passed and been cut substantially as herein set forth.
2. In a circular saw guard the combination with an adjustable bracket mounted
upon the saw bench and formed so as to protect the upper part of the saw and
also capable of being moved out of the way when not required, of a shield for
the front of the saw mounted arranged and moving automatically in the arc of
a circle in either of the ways substantially as and for the purposes herein described.
3. The general combination and arrangement of parts substantially as and for
purposes herein described and as illustrated by Figs. 1, 2 and 3.
the
4. The general combination and arrangement of parts substantially as and for
the purposes herein described and as illustrated by Figs. 4, 5 and 6.1
Deted this 914 d... of I
1000
H. B. BARLOW & GILLETT,
Agents for Applicants, 17, St. Ann's Square, Manchester.