Improvements in Guards for Circular Saws.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Guards for Circular Saws.
I, LAWRENCE CARTWRIGHT, of Rosedale, Foleshill Road, Coventry, in the
County of Warwick, Saw Mill Manager, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in guards or shields for circular saws,
the object being to provide a guard or shields which while covering the saw to a
sufficient extent to prevent injury to anyone accidentally coming into contact with
it, will yet admit of varying sizes of timber being operated upon and will provide
for an automatic adjustment of the guard when the timber is passing through and
when it has left the saw bench.
I
In carrying my invention into effect I construct my shield or guard in the form
of a hinged pair of curved arms which are angle or channel shaped in section
so as to cover the front and the side or sides of the saw as may be desired.
provide a standard or upright pedestal which I attach to any convenient portion
of the saw bench or frame, and I arrange upon this upright pedestal a sliding
collar or sleeve which is formed upon or connected to a projecting arm or carrier.
I may make this sleeve to rise and fall by means of a screw and hand wheel or
by means of clipping clamps which bind on to the column or vertical stem of the
pedestal or bracket so as to enable the projecting arm to be placed in any position
suitable for the size of saw which is to be covered and protected, I make my
pedestal tubular, circular, or any other form which can be conveniently attached
to the frame of the particular saw bench to which my improvements are to be
applied, I also sometimes make it in such a manner that by the removal of a
bolt it can be made to swing free of saw for changing or sharpening the saw.
Upon the projecting arm or carrier I mount a sliding block or stem upon which
I pivot my circular shields or guards. The pins or pivots upon which the sleeves
hinge being arranged upon the lower portion of the sliding block. I secure the
sliding block in any desired position upon the projecting arm by means of a pin,
set screw or by other ordinary fastenings.
The shields or guards I form with quadrant like guide pieces which pass through
suitably shaped holes within the stem of the sliding block and I preferably arrange
a number of holes within each quadrant guide piece to receive a pin or bolt and
collar or clip to secure the bars or quadrants in any position to suit the height
above the level of the work bench necessary for varying thicknesses of timber.
I arrange my shields in such a manner that they form a moving cover or casing
to the back and front of the circular saw and while being automatic in respect to
covering the exposed portions of the saw may yet be easily raised by means of a
projection or handle knob formed upon or attached to the outer portion of the
shields. I make the shields of metal or other suitable material.
Dated this 10th day of August 1898
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.

page_text: Improvements in Guards for Circular Saws.
I, LAWRENCE CARTWRIGHT, of Rosedale, Foleshill. Road, Coventry, in the
County of Warwick, Saw Mill Manager, 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 shields for circular saws,
my object being to provide a guard or shield. which while covering the saw to a
sufficient extent to prevent injury to anyone accidentally coming into contact with
it, will yet admit of varying sizes of timber being operated upon and will provide
for an automatic adjustment of the guard when the timber is passing through and
when it has left the saw bench.
In the accompanying sheet of explanatory drawings to be hereinafter referred
to:-
Figure 1 is a side elevation and Figure 2 an end elevation of a circular saw
guard or shield constructed and arranged in accordance with my invention.
The same reference letters in the two views indicate the same parts.
In carrying my invention into effect I construct my shield or guard with a hinged
pair of curved arms as A A' preferably of aluminium and angle shaped in section
as shown at Figure 2. I provide a standard B which I attach to any convenient
portion of the saw bench or frame, and I arrange upon this upright pedestal or
standard a sliding collar or sleeve C which is formed upon or connected with a
projecting arm or carrier D. I make this sleeve to rise and fall preferably by
means of a screw and hand wheel E to enable the projecting arm D to be placed
in any position suitable for the size of saw which is to be covered and protected.
Upon the projecting arm or carrier D I fix one end of the rod or stem F and
at the opposite end of such rod or stem I mount the head or block G upon which
the arms AA for guarding the saw H are pivotted. I secure the rod or stem F
in the required position to the arm or carrier D to suit the saw, by means of a
pin, set screw, or by other ordinary fastening.
The shield or guard arms A A¹ have quadrant like guide pieces J J¹ which pass
through a slot in the head or block G. The said guide pieces are each slotted
and provided with an adjustable stop peg or clip bolt KK¹ by which they can
be secured, together with the arms A A¹, in any position to which they are
adjusted to suit the diameter of the saw.
My shields or guards form a protecting cover or casing for the saw, automati-
cally adjusting themselves by moving upon their pivots when the timber passes
under their lower or free ends.
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. In guards or shields for circular saws, the combination with adjustable sup-
ports of pivotted arms AA provided with guide pieces JJ', substantially as
described and illustrated.
!
2. An improved guard or shield for a circular saw bench comprised by the con-
struction and arrangement of parts substantially as described and as illustrated.
Dated this 27th day of April 1899
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and 25, Cross Street, Manchester,
Agents for Applicant.