Improvements in Guards or Fences for Circular Saws.
Year: 1899

page_text: Date of Application, 17th June, 1899
Complete Specification Left, 19th Mar., 1900-Accepted, 28th Apr., 1900
Improvements in Guards or Fences for Circular Saws.
We, RICHARD WILLIAM TAYLER and JOHN TAYLER, both of Avenue Villa,
Fornham Road, Bury St. Edmunds, in the County of Suffolk, Engineers, do
hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in guards or fences for circular saws
and has for its object to provide an improved guard or fence for use with
circular saws of different diameters when such saws are used interchangeably
in one and the same saw bench.
To this end we provide segmental metal plates or shields of the kind described
in the Specification of former Patent No. 11388 of 1898, the said shields being
of a curvature corresponding to that of the largest saw for which the bench is
designed and being pivoted to a slide working in a fixed head mounted upon a
horizontal arm which is fitted to a vertical pillar or bar secured to the saw
bench.
The horizontal arm is attached to the upright bar or pillar in such a manner
that it can be adjusted at any angle in the horizontal plane and we preferably
provide clutch gear for permitting the said arm to move in one direction only
around the upright pillar. The other end of the horizontal arm is provided
with a head adapted to receive the above mentioned slide which can be secured
in any position therein by suitable means, the said slide carrying at its lower end
what we term boxes to which the two curved guards are secured, the rear guard
being fixed and the front guard being arranged to slide in its box so that its
position can be adjusted therein; each of the said boxes is provided with teeth
so that the two boxes gear together whereby the adjustment of one shield to
suit any particular size of saw also effects the adjustment of the other shield.
In practice the horizontal arm and the curved guards are so adjusted that
the latter lie in the plane of the saw and guard respectively the front and the
back of the saw, the back guard passing into a slot or guide in the saw bench
and the front guard being adjusted at sufficient height to allow of the wood
to be sawn being passed under it against the saw.
To protect the fingers of the attendant from the front of the saw we provide
an additional guard which is normally held, in front of the part of the saw
underneath the above mentioned front curved guard so that the whole of the
periphery of the projecting portion of the saw is protected. This additional
guard is curved and is carried by an arm pivoted at a point in the axis of the
saw; it is so mounted that its distance from the centre of the saw can be
adjusted to suit the size of saw used. This guard is normally held projecting
through the saw bench, so as to guard the front of the saw as above mentioned
by a spring or weight and means are provided whereby when the work is fed
forward against the saw the said guard is caused to descend through the saw
bench so as to leave the saw uncovered, the arrangement being such that on
the passage of the wood the guard automatically rises again to its normal position.
1

page_text: A suitable arrangement for this purpose comprises a pivoted arm and lever
having a counterweight and being connected with the curved guard and pivoted
to the underside of the saw bench in such a manner that the position of its
pivot can be adjusted relatively with the centre of the saw to suit the diameter
of saw used. This arm and lever are normally caused by the counterweight to
project above the surface of the saw bench and at the same time to hold the
curved guard also in its uppermost position. When the wood to be sawn,
however, is pressed against the said projecting lever it depresses it so as to
lower the curved guard and hold it in its lowermost position until the wood
has passed over the lever which is then raised by the counterweight and returns
the curved guard to its uppermost or normal position.
101
T
1000
"1
G. F. REDFERN & Co.,
4, South Street, Finsbury; London,
Agents for the Applicants.
Improvements in Guards or Fences for Circular Saws.
We, RICHARD WILLIAM TAYLER and JOHN TAYLER, both of Avenue Villa,
Fornham Road, Bury St. Edmunds, in the County of Suffolk, Engineers, 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 relates to improvements in guards or fences for circular saws
and has for its object to provide an improved guard or fence for use with
circular saws of different diameters when such saws are used interchangeably
in one and the same saw bench.
In the accompanying drawings:-
อ
Figure 1 is a sectional side elevation of a part of a circular saw-bench having
our improved guards applied thereto; and
Figure 2 is a horizontal section on the line 2-2 Figure 1.
a is the saw table and the circular saw, these parts being of ordinary con-
struction. c, dare segmental metal plates or shields of the kind described in
the Specification of former l'atent No. 11388 of 1898, the said shields c,
el being
of a curvature corresponding to that of the largest saw for which the bench is
designed and being pivoted to a slide d working in a fixed head mounted
upon a horizontal arin e which is fitted to a vertical pillar or bar f secured to
the saw bench a.
The horizontal arm e is attached to the upright bar or pillar f in such a
manner that it can be adjusted at any angle in the horizontal plane and we
preferably provide clutch gear for permitting the said arm to move in one
direction only around the upright pillar. The other end of the horizontal arm
is provided with the head adapted to receive the above mentioned slide d
which can be secured in any position therein by suitable means such as by. the
clamping screw, the said slide d carrying at its lower end what we. term
boxes to which the two curved guards c, el are secured, the rear guard c
being fixed and the front guard c¹ being arranged to slide in a guide fitted to
its box so that its position can be adjusted therein; each of the said boxes g,rg
is provided with a toothed segment g, gwhich gear with a rack g² working in
the slidė d so that by adjusting one shield to suit any particular size of saw
by turning it on its pivot the adjustment of the other shield is also effected. The
'

page_text: clamping screw also serves to lock the rack in the position to which it is
adjusted, the said rack being formed, with a slot through which the screw
passes.
In practice the horizontal arm and the curved guards are so adjusted that the
latter lie in the plane of the saw, and guard respectively the front and the back
of the saw,
the back guard c passing into a slot or guide a¹ in the saw bench and
the front guard being adjusted at sufficient height to allow of the wood A, to
be sawn being passed under it against the saw.
To protect the fingers of the attendant from the front of the saw we provide an
additional guard i which is normally held in front of the part of the saw under-
neath the above mentioned front curved guard so that the whole of the
periphery of the projecting portion of the saw is protected. This additional
guard i is curved and is carried by a socket 2¹ adjustably mounted on a lever or
arm pivoted at a point in the axis of the saw; by adjusting the socket. ¡¹
on the arm the distance of the guard i from the centre of the saw can be
adjusted to suit the size of saw used; is a set screw for clamping the socket
to the arm. The guard is normally held projecting through the saw bench,
so as to guard the front of the saw, as above mentioned, by a spring or weight
and means are provided whereby when the work is fed forward against the
saw the said guard i is caused to descend through the saw bench a so as to leave
the saw uncovered, the arrangement being such that on the passage of the
wood A the guard automatically rises again to its normal position.
which
A suitable arrangement for this purpose comprises an arm or tumbler
is pivoted upon the stud 1 secured to the socket or sleeve adjustably mounted
on the supporting bar fixed to the front of the, bench u. The tumbler j has
secured to it the curved lever or catch the free end of which embraces the
arm as clearly shewn. The tumbler j and guard are normally caused to
project above the surface of the saw bench a, that is to say, into the position
shewn in full lines in the drawings, by the weight which is hung on the
end of the arm forming an extension of the arm 2. When the wood to be
sawn, however, is pressed against the said projecting tumbler as it is fed
forward to the jaw it depresses it so as to lower the curved guard and hold it
in its lowermost position (shewn in broken lines) until the wood has passed
over the tumbler which is then raised by the weight and returns the curved
guard to its uppermost or normal position.
As above mentioned the guard i is adjustably mounted upon the arm and
the socket is also adjustably mounted upon the bar so that both these parts
can be adjusted in position to suit saws of different diameters.
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 having curved shields or guards the arrangement wherein
the said guards are rigidly or adjustably mounted in boxes pivoted to a slide
working in a fixed head, the said boxes having toothed sectors gearing with a
rack held in the slide, substantially as, and for the purpose, hereinbefore de-
scribed.
2. In a circular saw the employment of a front shield or guard normally held
in front of the saw and of means whereby the said guard is automatically
depressed as the work is fed forward to the saw and returned to cover the front
of the saw when the work has passed, substantially as herein before described.
3. In an arrangement of the kind described in Claim 2 mounting the guard
upon a pivoted counterweighted arm and employing in combination therewith
a pivoted tumbler normally projecting above the surface of the said bench and
having a curved lever or catch embracing the said pivoted arm substantially
as, and for the purpose, herein before described.
4. In a circular saw having a guard of the kind described in the preceding

page_text: claiming clause the described means for adjustably mounting the guard upon
its arm and the tumbler upon its support.
5. The combination and arrangement of parts forming the improved circular
saw guard herein before described and illustrated in the accompanying draw-
ings.
T
1 11
10.1. 1 Vanah 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.