Improvementss.
Year: 1899

page_text: ----Date of Application,-20th-Jan.,-1899...
Complete Specification Left, 19th Oct., 1899-Accepted, 20th Jan., 1900
I, ANDREW Cooк, of 24, Elliot Street, Cranstonhill, in the County of the City
of Glasgow, North Britain, Saw File Manufacturer do hereby declare the nature
of this invention to be as follows:-
This invention relates to improvements in and connected with guards or shields
for circular saws.
In carrying out my invention I provide a standard which is fixed to the bench.
Connected to this standard there is a bracket to which there is connected an arm
capable of being adjusted by means of a screw in the standard. This arm is held
in a rigid position by means of a slip pin, which passes through it and projecting
part of the bracket. The guard or shield is fixed to this arm in any suitable
manner. Connected to this guard or shield there is one end of a riving knife,
which is provided with a slot so that it is capable of being adjusted to suit any
diameter of saw, while the other end is connected to a sliding bar or rod by
means-of-a-thumb-screw-or-other-convenient-method-This-sliding-bar-or-rod-
works in a slot provided in a bar fixed to the underside of the bench, thereby not
only making it capable of being adjusted to suit any size of saw, but also ensuring
the guard being always in the centre of the saw.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow,
Applicant's Patent Agents."
Improvements in and connected with Guards or Shields for Circular
Saws.
I, ANDREW Cooк, of 24, Elliot Street, Cranstonhill, in the County of the City
of Glasgow, North Britain, Saw and File Manufacturer, 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 which relates to a safety guard or shield for circular saws has
for its object the construction of a device as hereafter to be described which will
prevent accidents to which the attendant or sawyer has hitherto been liable during
sawing operations.
The invention consists of certain novel features and combination of parts which

page_text: have not hitherto been known in the branch of mechanics to which my invention
belongs, and which in use offer no obstruction and cause no hindrance to the
sawyer whilst working.
In order that my invention may be properly understood and readily carried
into effect, I have hereunto appended sheets of drawings, of which,
Figure 1 is a perspective view looking at the side of the guard or shield,
embodying my invention shown in working position relatively with the circular
saw to which it is attached.
Figure 2 is also a perspective view showing the guard or shield swung out of
engagement with the circular saw.
Figure 3 is a plan of the swivelling arm only, illustrating in full line one
method of how it may be locked when in working position, and in dotted lines
its unlocked position, when it is free to be swung clear of the saw.
Figure 4 is a vertical transverse section of a pillar or standard illustrating
a method of how the swivelling arm may be raised and lowered and clamped to
any elevation in which it is intended to operate, and is an alternative method to
the screw device shown in Figures 1 and 2.
Figure 5 is a perspective view of a bracket intended to be fixed to the under
side of the bench, in which is carried a sliding bar, in order to adjust the riving
knife to suit various sizes of saws, and
Figure 6 is a similar view of a fixed bracket intended to be used with a
bench having a travelling top, and is fixed by one or two depending arms to cross
beams placed beneath or at the side of the bench. The four last named figures
are drawn to an enlarged scale. A is the pillar or standard in which is mounted
the vertical screw B, which is rotatably fixed at the top and bottom thereof. The
said screw B terminates with a square extension on which is fitted the cranked
handle C for operating it. A bifurcated nut D, working in suitable guide recesses
formed within the pillar A, is raised and lowered by the screw B. To this nut D
is pivoted the arm E, which may conveniently be bent as in Figures 1 and 2,
or made straight as in Figure 3.
The arm, which may be in the form of a rod, tube or bar, as shown in
Figure 1, is in its normal or working position, and is locked by either the bolt c,
or as in Figure 3 by the pivotal catch or locking device et engaging the T shaped
end of the bolt formed on the said arm E. When it is desired to swing the
guard out of position with the saw it is unlocked. by either withdrawing the
bolt e, or by raising the handle of the locking device el, when it is free to be
turned on its pivot E. The outer end of the arm is formed with a bush or
tubular hole F, in which is inserted a transverse arm G. The transverse arm G
is rendered slidable or telescopic within the bush F, in order to bring the
guard H, which is attached to its outer end, immediately over the saw I, and is
or may be clamped in position by the clamping screws g. The guard H proper,
consists of a curved central piece of channel formation and is provided with
suitable snugs h and h¹. By means of the said snugs h and the outer end
of the riving knife is adjustably supported. The outer end of the said riving
knife J terminates with a curved slot), through which pass, the screw studs or
bolts and, which clamp the knife to the aforesaid snugs and h¹. The said
snugs h and h are provided with slots in which the said bolts and work in
order to accommodate various sizes of saws.
The jointed extension or hood H₁ of the guard is adjustably attached to and
rendered detachable from the guard proper by means of a central snug ³, termin-
able curved slot and a screw stud or bolt. By virtue of a pivotal pin h³, the
guard extension or hood H¹ may be turned up and thrown back to rest upon the
guard proper, and be out of the way when in the sawing operation the full cut
of the saw is required.
The lower end of the riving knife J is formed with an open slot, as seen more
particularly in Figure 2. The end of the knife with its open slot aforesaid works
between two jaws of a slidable bar K, by which it is rendered attachable and

page_text: detachable by a clamping screw k. The sliding bar is supported in a fixed
bracket L attached to the underside of the bench, reference being had to Figures 1
and 5, and is capable of a longitudinal movement so as to accommodate the knife
to varying diameters of saws.
The sliding bar K illustrated in Figure 6 works within a slot of a fixed
bracket L' fixed by one, or as shown in the figure, to two depending arms and
to two transverse beams M and M formed beneath or constituting a part of the
bench, and is intended to be used with saw benches having travelling tops to which
it is specially applicable.
Referring to the arm E and in the means of raising it by means of a screw
and nut in lieu of this in Figure 4, I have shown a method by which the nut,
collar or sleeve can conveniently be raised by hand by moving the said collar
or sleeve D up and down the rod B. The rear end of the collar or sleeve D'
terminates with a screw extension which works in a vertical slot a, formed in the
fixed bracket A. The screw extension of the collar or sleeve D¹ is engaged by
a nut formed with a handle by which means the collar or sleeve D and with it the
arm E can be clamped in any desired elevation.
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 a safety guard or shield for saw benches the combination of a fixed pillar
or standard, carrying a vertical screw or bifurcated nut working on said vertical
screw, and a swivelling arm pivoted to said nut and a drop pin or bolt by which
said arm is locked or unlocked, the said arm carrying at the opposite end a
transverse telescopic tube bar or rod, to which is attached the guard or shield,
said swivelling arm capable of being moved out of its due engagement with the
saw when not in use substantially as set forth and shown on the annexed drawings.
2. In a safety guard or shield for saw benches the combination of a fixed pillar
or standard, carrying a vertical rod or spindle, a collar or sleeve to which is
pivoted a swivelling arm, said collar or sleeve slidably supported on said rod or
spindle and capable of being locked or jammed by a screw nut having a con-
trolling handle substantially as set forth and shown on the annexed drawings.
3. In saw benches a sliding bar for carrying the lower end of the riving knife
and capable of longitudinal movement within a fixed bracket attached to the
underside of a fixed saw bench, or a saw bench having a travelling top attached
to side beams independent or constituting a part of the bench in order to adjust
the riving knife to suit varying diameters of saws, substantially as set forth and
shown on the annexed drawings.
Toted th: 1041.
Otation 1900
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow,
Applicant's Patent Agents.