Improvements in Guards or Shields for Circular Saws.
Year: 1898

page_text: Date of Application, 7th July, 1898
Complete Specification Left, 22nd Feb., 1899-Accepted, 22nd Apr.,
1899
PROVISIONAL SPECIFICATION.
Improvements in Guards or Shields for Circular Saws.
1, ARTHUR SAMUEL FRANCIS ROBINSON, of the Vale of White Horse Iron
Works, Wantage, in the County of Berks, Engineer, do hereby declare the
nature of this invention to be as follows:--
This invention relates to improvements in guards or shields for circular saws
and has for object to provide guards or shields that shall be strong and simple
in construction, efficient in affording protection to the operator, and adapted
for receiving additional shields or cover plates or the like for preventing or
retarding the flying about of sawdust and for catching pieces of material that
may be picked up by the rotating saw.
A saw guard according to this invention comprises a frame or carrier hinged
or jointed at one side to an adjacent support or supports or to the saw bench and
adapted to be supported over the saw so as by itself or by suitable attachments
carried thereby, to guard the saw at both ends and also it may be at both sides
thereof, the arrangement being such that the guard can be easily and readily
turned over to one side when it is required to sharpen or remove the saw, and,
when in use, will not be liable to become fixed in place by saw-dust or pieces of
wood and will not interfere with the use of the ordinary saw bench sliding fence,
nor inconvenience the operator in any way.
The end
In one construction of saw guard according to this invention, the frame com-
prises two end bars (front and rear) each of which is pivotally mounted at one
end on a bracket or the like fixed to the saw bench or other suitable adjacent
support. A bolt passes through the two brackets and through one end of each
of the end bars and forms a hinge about which the guard frame may be turned
when required. At or near their lower hinged ends the end bars are bent up-
wards and so as to extend transversely over the saw bench, one of said bars being
arranged in front and the other at the rear of and at a suitable distance from the
saw. The lower pivoted ends of these bars are also formed as or provided with
suitable stops that are adapted to rest upon the table or support whereby the
frame is supported in position at a suitable distance above the saw.
bars are connected at the upper ends by longitudinal bars or rods arranged to
come one on each side of and above the saw when the guard is in position for use.
The pivoted frame is or may also be provided with a riving knife and with a
vertically movable bar or lip-guard these being arranged at opposite ends of
and near to the saw and in the plane thereof so as to effectually guard the same
Such riving-knife and tip guard
without interfering with the use of the saw.
may conveniently be carried by one of the longitudinal bars or rods connecting
the upper ends of the pivoted end bars of the frame, in which case such bar
To adapt the riving-knife and tip guard
is arranged over or nearly over the saw.
for different sizes of saw, they may be adjustably connected to the bar or part
that carries them. In some cases one of these guard parts may be used without
the other.
In another construction, the guard frame is pivoted to the upper ends of a pair

page_text: of uprights that may be permanently or removably attached to the side of the
saw bench, the said frame being provided with arms or stops adapted to abut
against the uprights, or parts carried thereby, so as to support the frame in
position for use. Other stops may be provided for suitably holding the frame
in the turned over or inoperative position. The frame, which is flat or may be
of stirrup shape, is provided with a longitudinal bar or rod to which is attached
a riving iron and tip bar, as in the example herein before described.
As a further means of obviating danger, hinged or pivoted frames such as
herein before described are or may be provided with plates of suitable material
such as sheet iron or wooden boards, at the top and depending from the sides
and ends. The depending plates may be hinged or adjustably or removably
connected to the frame, as by bolts and slots or the like, so as to enable them
to be readily moved out of the way or replaced by others to suit the size of work
to be sawn.
In some cases sheets of reticulated material or lattice work may
be used instead of metal or other plates. Additional guard plates may be pro-
vided when required. The additional protecting plates serve to prevent saw
dust from flying into the face of the operator, or about the room or place in
which the same is located, and the side ones are specially useful in protecting
passers by.
I, ARTHUR SAMUEL FRANCIS ROBINSON, of the Vale of White Horse Iron
Works, Wantage, in the County of Berks, Engineer, 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
and has for object to provide guards or shields that shall be strong and simple
in construction, efficient in affording protection to the operator, and adapted
for receiving additional shields or cover plates or the like for preventing or
retarding the flying about of sawdust and for catching pieces of material that
may be picked up by the rotating saw.
A saw guard according to this invention comprises a frame or carrier hinged
or jointed at one side to an adjacent support or supports or to the saw bench and
adapted to be supported over the saw so as by itself or by suitable attachments
carried thereby, to guard the saw at both ends and also it may be at both sides
thereof, the arrangement being such that the guard can be easily and readily
turned over to one side when it is required to sharpen or remove the saw, and,
when in use, will not be liable to become fixed in place by saw dust or pieces of
wood and will not interfere with the use of the ordinary saw bench sliding fence,
nor inconvenience the operator in any way.
Fig. 1 of the accompanying drawings is a perspective view showing one con-
struction of saw guard according to this invention applied to a saw bench. In
this construction, the frame or carrier comprises two end bars 1 and 2 (front and
rear) each of which is pivotally mounted at its lower rear end on a bracket 3 or

page_text: the like fixed to the saw bench 4 or other suitable adjacent support. A bolt 5
passes through the two brackets 3 and through one end of each of the end bars 1
and 2 and forms a pivot about which the guard frame can be turned when required
so as to bring it over the saw 6 or away therefrom, as may be desired. From a
point near their lower pivotted ends, the end bars 1 and 2 are bent upwards and
so as to extend transversely over the saw bench, as shown, one of said bars being
arranged in front and the other at the rear of and at a suitable distance from the
saw. The lower pivoted ends of the bars are so shaped, as shown, that they are
adapted to serve as stops to rest upon the saw bench or table 4 and support the
pivoted frame in position at a suitable distance above the saw.
Or the bars may,
for a like purpose, be provided with separate stops. The upper ends of the said
bars are connected together by longitudinal bars or rods and S arranged to
come one on each side of and above the saw when the guard is in position for use.
The pivoted frame is or may also be provided with a riving-knife 9 and with
a vertically movable bar or tip-guard 10, these being arranged at opposite ends of
and near to the saw and in the plane thereof as shown, so as to effectually guard
the same without interfering with the use thereof. Such riving-knife and tip-
guard, which are well known, may conveniently be carried by the longitudinal
bar or rod S, in which case such bar is arranged over or nearly over the saw.
To adapt the riving-knife and tip guard for different sizes of saw, they may be
adjustably connected to the bar or part that carries them. In some cases one
of these guard parts may be used without the other.
Figs. 2 and 3 are perspective views showing another construction, Fig. 2
showing the frame in its operative position and Fig. in its inoperative position.
In this case the movable frame is pivoted at 1", 2" to the upper ends of a
pair of
uprights 11 and 12 that may be permanently or removably attached to the side
of the saw bench 4, the said frame being provided with arms or stops 13, 14
adapted to abut against the uprights, or, as shown, against a rod 15 carried
thereby, so as to support the frame in position for use (Fig. 2). Other stops
may be provided if desired, for suitably holding the frame in the turned over or
inoperative position shown in Fig. 3, or the frame may be allowed to simply
hang over in its inoperative position. The frame, which is flat, or may be of
stirrup shape, as shown, is provided with a longitudinal bar or rod 8 to which is
attached the riving-iron 9 and tip-bar 10, as in the example hereinbefore
described.
Figs. 4, 5 and 6 show respectively in front elevation, end elevation and plan,
an arrangement similar to that illustrated in Figs. 2 and 3 but wherein the tip-
bar 10 is pivoted to a bar 10" fixed to the riving-iron 9 which is alone directly
connected to the movable frame. The latter is pivoted to a support 11-12
formed of a flat metal bar bent to a U shape and bolted to the top of the saw
bench, the upwardly extending parts of the support being connected by a cross
rod 15 that serves as a stop for the arms 13 and 14 of the pivoted frame as in
Figs. 3 and 4.
The support 11, 12 may however be formed of two separate flat
bars the lower end of each of which is twisted into a plane at right angles to that
of the upper portion to admit of its being bolted to the side of the saw bench
as shown in end elevation in Fig. 7. The support 11, 12 may be of less width
than the movable frame and be pivoted to the central portion of the latter, as
shown in Fig. 6, or to one end thereof, as shown in Fig. 8, as may be desired in
particular cases.
As a further means of obviating danger, hinged or pivoted frames such as
hereinbefore described are or may be provided with plates 16 of suitable material
such as sheet iron or wooden boards, these plates being supported at the top
so as to depend from the sides and ends of the movable frame as shown at 16 in
Fig. 9. The said depending plates 16 may be hinged or be adjustably or re-
movably connected to the movable frame as by bolts and slots or the like, so as
to admit of their being readily moved out of the way or replaced by others to
suit the size of the work to be sawn.
In some cases sheets of reticulated

page_text: material or lattice work may be used instead of metal or other plates. A sheet
of such material may be secured to the top of the pivoted frame as shown at 17
in Figs. 4, 6 and 8. Additional guard plates may be provided when required.
The additional protecting plates 11 at the ends of the movable frame serve to
prevent saw dust from flying into the face of the operator, or about the room or
place in which the saw bench is located, and the side ones are specially useful
in protecting passers by.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed I declare that what I
claim is:
1. A saw guard comprising a frame or carrier hinged or jointed at one side
to an adjacent support or supports or to the saw bench and adapted to be sup-
ported over the saw so as by itself or by attachments carried thereby to guard
the saw at both ends and also it may be at both sides thereof, the arrangement
being such that the frame or carrier can be readily turned over into a position
above the saw for use, or in the opposite direction into its inoperative position,
substantially as hereinbefore described with reference to the drawings annexed.
2. In a saw guard, the combination of the riving knife or tip guard or both,
with a pivoted frame or carrier whereby the said knife or tip guard or both can
be readily moved into a position in which it or they can be suspended in position
above the saw and saw bench and can be readily turned into an inoperative posi-
tion clear of the saw and saw bench, substantially as described.
3. The improved saw guards constructed, arranged and operating substan-
tially as herein before described with reference respectively to and shown in
Fig. 1 in Figs. 2 and 3, and in Figs. 4, 5 and of the drawings annexed, or
modified according to Fig. 7 or to Fig. 8 and whether the same be provided with
a riving-knife, or tip-guard, or both, or with additional protecting plates, as
set forth.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.