Improved Automatic Guard or Shield for Circular Saws.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improved Automatic Guard or Shield for Circular Saws.
I, JABEZ NALL, of Spring Vale Saw Mills, Penistone, in the County of York,
Case Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to guards or shields for covering the teeth of circular
saws as a means of preventing accidents, and hereinafter is described a guard or
shield which not only covers the points of the teeth or periphery of the saw but
also covers and encloses a material part of the sides of the latter so that there
is no danger at either of the sides or faces of the saw, and further the improved
guard is automatic in its adjustment to the requirements on introduction and on
withdrawal of the wood or timber froni the saw.
According to this invention a semicircular guard is employed, the opposite
ends of the arc resting upon the saw bench. The said guard is made in two
halves or segments and the segments are hinged together and over a central
vertical line above the saw and are carried by a rod or arm (extending from a
bracket) which rod serves as a hinge pin for the segments. The guard has at both
faces of the saw, side pieces which enclose part of the opposite faces of the saw,
thereby effectually fencing in the teeth both as to periphery and sides.
The action is as follows:-The half or segment of the guard at the leading
end of the saw bench is provided with an angled lip or projection under which
the wood or timber to be sawn passes and thereby begins to raise the leading
end segment on its hinge, and as the wood or timber is passed forward it reaches
and raises the second segment of the guard, the saw being thus absolutely enclosed
by the guard and by the timber, and on the end of the timber being reached
the outer end of the leading segment slips over and falls onto the saw bench
thereby covering the front of the saw, and in like manner the second segment
falls and encloses the teeth of the saw automatically soon as the timber is clear of
the teeth. The guard made of a certain radius will be suitable for several different
diameters of saws.
Dated this 22-1
T
1000
Improved Automatic Guard or Shield for Circular Saws.
I, JABEZ NALL, of Spring Vale Saw Mills, Penistone, in the County of York,
5 Case Manufacturer, do hereby declare the nature of this invention and in what
[Price 8d.]

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement;
-
This invention relates to guards or shields for covering the teeth of eircular
saws as a means of preventing accidents, and hereinafter is described a guard or
shield which not only covers the points of the teeth or periphery of the saw, but
also covers and encloses a material part of the sides of the latter so that there is
no danger at either of the sides or faces of the saw; and further, the improved
guard is automatic in its adjustment to the requirements on introduction and
on withdrawal of the wood or timber from the saw. The invention is simple in
construction and efficient in its action and can be applied at very little cost.
Such being the nature and object of my said invention, the following is a com-
plete description of same, reference being had to the annexed drawings, in which ;-
Fig. 1 is a side elevation of a saw bench and saw fitted with the improved saw
guard.
Fig. 2 is a plan view of Fig. 1.
--
According to this invention a semi-circular guard 1 is employed, the opposite
ends 2,2 of the are resting upon the saw bench 3. The said guard 1 is made in
two halves or segments and the segments are hinged together at 4 over a central
vertical line above the saw 5 and are carried by a rod or arm 6 extending from a
bracket fixed to the bench 3 and the rod 6 serves as a hinge pin for the segments
forming the guard 1. The guard has at both faces of the saw 5 side pieces 7", 7"
which enclose part of the opposite faces of the saw, thereby effectually fencing
in the teeth both as to periphery and sides.
The action is as follows:-The half or segment 1" of the guard 1 at the leading
end of the saw bench 3 is provided with an angled lip or projection 9 under which
the wood or timber to be sawn passes and thereby begins to raise the leading end
segment 1" on its hinge 4 and as the wood or timber is passed forward it reaches
and raises the second segment 1 of the guard, the saw being thus absolutely
enclosed by the guard and by the timber, and on the end of the timber being
reached the outer end of the leading segment 1" slips over and falls onto the saw
bench thereby covering the front of the saw 5 and in like manner the second
segment falls and encloses the teeth of the saw 5 automatically soon as the timber
is clear of the teeth. A guard made in accordance with this invention is suitable
for several different diameters of saws.
The upper edges of the guard 1 are preferably left open at 10 (see Fig. 2) so
that the operative can see the teeth of the saw 5 whilst at the same time it is
securely fenced in: 11 is the ordinary saw fence.
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 general construction, arrangement, and combination of parts constitut-
ing the improved saw guard as herein described and substantially as illustrated
by the accompanying drawings.
(2) The segments 1, 1ª hinged to a rod or arm such as 6 directly above a circular
saw, all in combination as and for the purpose herein described and substantially
as illustrated by the annexed drawings.
Dated this 20th day of Varab 1900