An Improved Guard for Circular Saws and other similar Machinery.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
An Improved Guard for Circular Saws and other similar Machinery.
FREDERICK THOMAS GREENWOOD, Ivy Bank, Alexandra Road, St. Anne's-on-
the-Sea, in the County of Lancaster, Machinist, do hereby declare the nature
of this invention to be as follows:-
The object of my invention is to cover the saw teeth so that accidents by
pieces of wood being thrown forward from back of saw are prevented also to
prevent persons being injured by falling upon the saw teeth.
My invention consists of a bar, suitably fixed on an horizontal plane above
the saw bench. On this bar I arrange a series of slotted levers, shields & con-
necting rod at both front and back of saw in such a way that when the piece
of work to be operated upon comes in contact with one of the aforesaid levers it
lifts the front shield & presents the saw teeth to the work, & rests upon it
untill the work has gone through.
Afterwards automatically returning to its former position.
When the work comes in contact with the shield at the back of the saw the
pressure of the work raises the shield to the level of the work and to this shield
I attach an inclined slotted conecting rod which is also attached to the horizontal
bar to allow the shield to automatically slide into former position.
The whole of the guard or shielding aparatus is suitably fixed on an adjust-
able brackett which allows the guard to be turned up or swivelled so as to enable
the operator to change or sharpen the saw.
To the horizontal bar a riving knife may be attached if required.
COMPLETE SPECIFICATION.
An Improved Guard for Circular Saws and other similar Machinery.
I, FREDERICK THOMAS GREENWOOD, of Ivy Bank, Alexandra Road, St. Anne's-on-
the-Sea, in the County of Lancaster, Machinist, do hereby declare the nature
of this invention and in what manner the same is to be performed to be par-
ticularly described and ascertained in and by the following statement:-
This invention is applicable to circular saws and other similar revolving
cutters.
The objects of this invention are to cover or protect the saw teeth or cutters
so that accidents owing to pieces of wood being thrown forward from the back
of the saw or cutter are prevented, and also to prevent persons from being injured
by falling upon or otherwise coming into contact with the saw teeth or cutters.
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page_text: The manner in which my said invention is to be performed or carried into
practical effect will be readily understood on reference to the annexed sheet of
drawings and the following explanation thereof.
Fig. 1 on the drawings is an elevation and Fig. 2 a plan view of a circular
saw bench showing the application of my invention thereto, a being part of the
metal framing
the bench and c the circular saw.
My invention consists principally of a bar d suitably fixed in a horizontal
position above the bench 6 and slightly above and in front of the teeth of the
saw c.
Pivotted at their inner ends to about the centre of this bar I arrange two
slotted levers or shields e and f, the outer ends of which are supported by two
curved connecting rods g and h the upper ends of which are pivotted to pins i
adjustable in slots in the horizontal bar d.
When a piece of timber to be operated upon is pushed along the bench b in
the direction of the arrow it first comes into contact with the connecting lever h
pushing it forward and causing it to lift the front shield f and present the
teeth of the saw c to the work, the connecting lever h resting upon the latter
until it has passed through (see dotted lines on Fig. 1) after which it returns
automatically to its former position.
When the work comes into contact with the second lever or shield at the
back of the saw c it raises this shield to the level of the work, and to this shield
is attached the inclined or curved slotted rod g which is also connected to the
horizontal bar d to allow the shield e to automatically slide back again into
its former position.
The back shield e is made double (see Fig. 2) the inner half being provided
with a flange e which covers up to the off side edges of the saw teeth.
The whole of this guard or shielding apparatus is suitably fixed on an adjust-
able bracket which allows the horizontal bar d which supports the whole guard
to be raised or lowered by the hand wheel and screw and slided or swivelled
out of the way so as to allow the operator to change or sharpen the saw.
A riving knife may be attached to the horizontal bar d if required.
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:-
The improved guard for circular saws and other similar machinery consisting
principally of a horizontal bar suitably supported by an adjustable bracket above
a work bench and carrying two or more slotted levers or shields suspended there-
from and so arranged as to shield the teeth of the circular saw or cutter, and to
be raised up automatically by the work as it is passed along, and then to fall
back again behind the work into its former position, substantially as hereinbefore
described and illustrated by the drawings annexed.
Doted this 11th dor of Anni 1000
G. E. DAVIES & SON,
Agents for the Applicant, 4, St. Ann's Square, Manchester.