IMPROVEMENTS IN MACHINERY, TOOLS. AND TOOL HOLDERS TO BE USED FOR CUTTING. STONE, SLATE, MARBLE, AND OTHER MATERIALS
Year: 1868

page_text: LETTERS PATENT to Archibald Munro, of Arbroath, in the County
of Forfar, North Britain, for the Invention of "IMPROVEMENTS IN
MACHINERY, TOOLS. AND TOOL HOLDERS TO BE USED FOR CUTTING. STONE,
SLATE, MARBLE, AND OTHER MATERIALS."
Sealed the 28th October 1868, and dated the 1st May 1868.
PROVISIONAL SPECIFICATION left by the said Archibald Munro at
the Office of the Commissioners of Patents, with his Petition, on
the 1st May 1868.
I, ARCHIBALD MUNRO, of Arbroath, in the County of Forfar, North
Britain, do hereby declare the nature of the said Invention of "IMPROVE.
MENTS IN MACHINERY, TOOLS, AND TOOL HOLDERS TO BE USED FOR CUTTING STONE,
SLATE, MARBLE, AND OTHER MATERIALS," to be as follows, that is to say :-
'This Invention relates, firstly, to certain improvements in the arrange-
ment of some parts of machinery employed for dressing the faces of
stone, slate, marble, and other similar materials.
The improvement consists in employing angular or A-shaped rails
and bearing rollers for the sliding table to travel upon, the under part
[Price Rd1

page_text: of the table being formed to correspond therewith, at the same time
to ensure greater steadiness and smoothness in working a second clip
guide rail is employed, which is fastened to the sides of the table and
catches under the projecting outer edge of the supporting rails. To still
further increase the steadiness of the machine and smoothness of travel
of the table one or more central carrying rollers are employed which
run upon a central rail.
The tables on which the stone to be dressed is placed instead of
being used in separate pieces as hitherto, are under the present
Invention firmly bolted together as one table, and the bar carrying the
nuts by which the travel of the table is produced through the
revolution of traversing screws is held to the table firmly by bolts or
studs, the traverse motion being actuated from the driving gear by a
driving belt and spur gearing so arranged that the rate of traverse may
be varied at will.
Another part of the Invention relates to improved modes for fixing
the discs which carry the dressing tool upon the revolving shaft of the
dressing machine. In place of the means hitherto employed for fixing
such discs under one arrangement the shaft is formed with one or more
dovetail slots in it, into which the dovetail head of one or more studs
or bolts fit, the outer end of the studs or bolts having a screw thread
formed on them and provided with nuts for tightening the discs when
they are placed in any required position on the shaft.
Another mode of fixing the discs consists in employing a key or
feather fitted into a groove in the boss of the disc, and one or more
cotters passing through the disc at right angles thereto, so that by
driving the cotters the key or feather is forced firmly against the shaft
and thus retains the discs firmly in any required position thereon, and in
place of using a simple cotter as last described one or more pairs of
gibs and cotters may be used.
In lieu however of fixing the discs by any of the foregoing arrange-
ments the boss of the disc may be formed to receive set screws on its
opposite sides, the points of which when tightened press upon keys,
feathers, strips, or pads.
Another part of the present Invention relates to improvements in the
holders by which the cutting tools are fixed to the discs of the machine.
Such tool holders may be varied much in form and in the relative size of

page_text: their parts, and they consist essentially of a sliding and wedging or
catching slip or jaw, which is fitted either into separate tool holders,
which holders themselves are fixed into the dressing discs, or the discs
themselves may be formed to receive the sliding jaw; or a lever is provided
with two pins in it, one of which passes into a hole in the holder or disc,
thus constituting a fulcrum, and the other passes into a hole in the
sliding jaw, so that by forcing the lever either to or from the disc or
holder the sliding jaw is moved inwards or outwards, and the tool fastened
or released at will.
In place of using a lever provided with two pins or studs, as last
set forth, the hole in the sliding jaw and fixed part of the holder may
be made of an elongated form, and a lever with an elongated projection
or stud may be applied thereto, which actuates the jaw in a similar
manner to that herein-before set forth. For the purpose of securing on
the table of the machine the stone or other material to be dressed
pinching blocks and bolts are employed.
Another part of the Invention relates to. machinery employed for
cutting stone or other material into such shape as is employed for
coping, string courses, pillars, and other generally similar purposes. The
machine itself in great part is similar to that herein-before set forth;
certain differences however do exist therein, and they consist in the
employment of a framework fitted with raising and lowering screws for
the purpose of elevating the bearings of the shaft or axle on which the
dressing rollers or discs are fixed; the raising and lowering screws, as
well as the shaft of the dressing rollers and discs, are driven by bevil
gearing from a vertical shaft placed at the side of the framework, and
the driving bevil pinion is arranged to slide upon the shaft so as to be
in constant gear in whatever position of its vertical travel the dressing
roller shaft may be. The tools are fitted to the dressing rollers by
moveable jaws in which one or more holes are formed so as to pass over
studs fixed into the roller; the studs are formed with holes. to receive
keys or wedges, by driving which into place the jaws are forced against
the roller, and the tools are retained in place by the grip thus produced
between the projecting part of the jaws and the radial face of the disc;
or in place of securing the tools in this manner sliding gripping jaws
may be used as in the tool holders herein-before referred to.
It is of course to be understood that this last-mentioned mode of
securing the tools may be used in connection with dressing rollers of

page_text: whatever form may be requisite according to the shape of the work to be
produced.
Another part of the Invention relates to a special construction of a
tool to be used for dressing and cutting stone, slate, marble, or other
materials; it consists in using blocks of steel or chilled cast iron in
section of the form known as an angle iron; one edge of the tool is
shaped into sharp projections which are used for taking off the rough
surfaces of stone, marble, or other material, while the other edge is
made smooth or plain and employed for producing the smooth and
finishing cnt; these tools are held in the dressing rollers by gripping
jaws held firm by screws, cotters, wedges, or otherwise, and their form is
such that they may be reversed in the recess made to contain them, so
that either cutting edge may be employed as required.
Another part of this Invention consists of an improved chuck for
cutting or dressing faces or beds of stone, marble, or other materials;
it consists of a boss fixed on the revolving shaft of the machine, from
which arms extend, and carry a bevilled circular or flat ring or periphery
into the face of which the tools are fitted by any of the modes herein-
before set forth, the advantage of a chuck so constructed being that it is
steadier than the discs hitherto employed.
Another part of the present Invention consists in the construction of
a diso in which the edge is serrated, each serrated plane constituting one
jaw of the tool holders, so that only one moveable or separate jaw is
employed, this being held in place so as to firmly grip the tool by means
of one or more bolts or studs or by a sliding wedge in any of the modes
herein-before set forth.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Archibald Munro in the Great Seal Patent
Office on the 31st October 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ARCHIBALD g
MUNRO, of Arbroath, in the County of Forfar, North Britain, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria. by Her

page_text: our Lord One thousand eight hundred and sixty-eight, in the thirty-
first year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Archibald Munro, Her special license
that I, the said Archibald Munro, my executors, administrators, and
assigns, or such others as I, the said Archibald Munro, my executors,
administrators, or assigns, should at any time agree with, and no
others, from time to time and all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend within the United Kingdom of Great Britain and Island, the
Chanuel Islands, and Isle of Man, au Invention for "IMPROVEMENTS IN
MACHINERY, TOOLS, AND TOOL HOLDERS TO BE USED FOR CUTTING STONE, SLATE,
MARBLE AND OTHER MATERIALS," upon the condition (amongst others)
that I, the said Archibald Munro, by an instrument in writing under
my hand and seal, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be per-
formed, an cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of
the said Letters Patent.
.
NOW KNOW YE, that I, the said Archibald Munro, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, reference being had to the accompany-
ing Drawings, and to the letters and figures marked thereon, that is
to say :-
My said Invention relates, firstly, to certain improvements in the
arrangement of some parts of machinery employed for dressing the
faces of stone, slate, marble, and other similar materials.
The improvements consists in employing augular or A-shaped rails
and bearing rollers for the sliding table to travel upon, the under part of
the table being formed to correspond therewith, at the same time to
ensure greater steadiness and smoothness in working a guide clip is
employed, which is fastened to the sides of the table, and catches under
the projecting outer edge of the supporting rails, and to still further
increase the steadiness of the machine and smoothness of travel of the
table one or more central carrying rollers are employed which run
upon a central rail.
The tables on which the stone to be dressed is placed, instead of
being used in separate pieces as hitherto, are under this present

page_text: Invention firmly bolted together as one table, and the bar carrying the
nuts by which the travel of the tables is produced through the revolution
of traversing screws is held to the table firmly by bolts or studs, the
traverse motion being actuated from the main driving gear by a driving
belt and spur gearing so arranged that the rate of traverse may be varied
at will..
Another part of this Invention relates to improved modes for fixing
the discs which carry the dressing tools upon the revolving shaft of the
dressing machine. In place of the means hitherto employed for fixing
such discs under one arrangement the shatt is formed with one or
more dovetail slots in it, into which the dovetail head of one or more
studs or bolts fit, the outer ends of the studs or bolts having a screw
thread formed on them, aud provided with nuts for tightening the discs
when they are placed in any required position on the shaft. Another
imode of fixing the discs consists in employing a key or feather fitted
into a groove in the boss of the disc, and one or more cutters passing
through the disc at right angles thereto, so that by driving the cutters
the key or feather is forced firmly against the shaft, and thus retains
the disc firmly in any required position thereon; and in place of using
a simple cotter as last described one or more pins or gibs and cotters
may be used.
In lieu however of fixing the discs by any of the foregoing arrange-
ments the boss of the disc may be formed to receive set screws in its
opposite side, the points of which when tightened press upon the keys,
feathers, or strips, or pads.
Another part of the present Invention relates to improvements in the
holders by which the cutting tools are fixed to the discs of the machine.
Such tool holders may be varied much in form and in the relative size
of the parts, and they consist essentially of a sliding and wedging or
catching slip or jaw, which is fitted either into separate tool holders,
which holders themselves are fixed into the dressing discs, or the discs
themselves may be formed to receive the sliding jaws. A lever is
provided with two pins in it, one of which passes into a hole in the
holder or disc, thus constituting a fulcrum, and the other passes into
a hole in the sliding jaw, so that by forcing the lever either to or from
the disc or holder the sliding jaw is moved inwards or outwards, and
the tool fastened or released at will. In place of using a lever pro-
vided with two pins or studs, as last set forth, the hole in the sliding

page_text: jaw and fixed part of the holder may be made of an elongated form,
and a lever with an elongated projection or stud may be applied thereto,
which actuates the jaw in a similar manner to that herein-before set
forth. For the purpose of securing on the table of the machine the
stone or other material to be dressed pinching blocks and bolts are
employed.
Another part of the Invention relates to machinery employed for
cutting stone or other material into such shape as is employed for
coping, string courses, pillars, and other generally similar purposes.
The machine itself is in great part similar to that herein-before set forth;
certain differences, however, do exist therein, and they consist in the
employment of a framework fitted with raising and lowering screws,
for the purpose of elevating the bearings of the shaft or axle on which
the dressing rollers or discs are fixed; the raising and lowering screws
as well as the shaft of the dressing rollers and discs, are driven by bevel
gearing from a vertical shaft placed at the side of the framework, and
the driving bevel pinion is arranged to slide upon the shaft so as to
be in constant gear in whatever position of its vertical travel the
dressing roller shaft may be. The tools are fitted to the dressing rollers
by moveable jaws in which one or more holes are formed so as to pass
over studs fixed into the roller; the studs are formed with holes to
receive keys or wedges, by driving which into place the jaws are forced
against the roller, and the tools are retained in place by the grip thus
produced between the projecting part of the jaws and the radial face
of the disc; or in place of securing the tools in this manner sliding
gripping jaws may be used as in the tool holder herein-before referred
to. It is of course to be understood that this last-mentioned mode of
securing the tools may be used in connection with dressing rollers of
whatever form may be requisite according to the shape of the work to
be produced.
Another part of this Invention relates to a special construction of a
tool to be used for dressing and cutting stone, slate, marble, or other
materials. In consists in using blocks of steel or chilled cast iron in
section of the form known as an angle iron; one edge of the tool is
shaped into sharp projections which are used for taking off the rough
surfaces of the stone, marble, or other material, while the other edge is
made smooth or plain, and employed for producing the smooth and
finishing cut. These tools are held in the dressing rollers by gripping

page_text: jaws held firm by screws, cotters, wedges, or otherwise, and their form
is such that they may be reversed in the recesses made to contain them,
so that either cutting edge may be employed as required.
It
Another part of this Invention consists of an improved chuck for
cutting or dressing faces or beds of stone, marble, or other materials.
consists of a boss fixed on the revolving shaft of the machine, from
which arms extend and carry a bevelled circular or flat ring or periphery,
into the face of which the tools are fitted by any of the modes herein-
before set forth, the advantage of a chuck so constructed being that it
is steadier than the discs hitherto employed.
Another part of the present Invention consists in the construction of
a disc in which the edge is serrated, each serrated plane constituting
one jaw of the tool holder, so that only one moveable or separate jaw
is employed, this being held in place so as to firmly grip the tool by
means of one or more bolts or studs, or by a sliding wedge in any of the
modes herein-before set forth, or instead of fixing separate tools into
such serrated discs the discs may be cast in chills, and the serrations
or teeth thus constitute cutting points; and straight plates with
serrated edges cast in chills, and fitted to a reciprocating or vibrating
frame may also be used as another form of the improved trols for
dressing stone, slate, marble, or other materials.
And in order that my said Invention may be properly understood
I now proceed more particularly to set forth the system, mode, or
manner in or under which the same is or may be used or practically
carried into effect, reference being had for the sake of more complete
elucidation to the accompanying Drawings and to the letters and figures
marked thereon, that is to say:-
On Sheet of the. Drawings Figure 1 is a plan; and Figure 2 an
elevation at the driving end of the improved stone dressing machine
constructed under this Invention. The other Figures on Sheet 1 are
details herein-after more fully referred to.
The table A on which the stone to be dressed is fastened down
travels longitudinally upon the V slides B, which are bolted to each
side of the bed plate C and is supported at the centre on the anti-
friction rollers D, which run upon the central rail E. The cutting
discs U are securely bolted to the collars U1 which are fixed on the
shaft supported in bearings on the standards W (which are
bolted to each side of the bed plate C) and the end on which part

page_text: of the gearing is carried is supported on the standard W. The first
motion shaft X is also supported on these standards and on it are
fitted the pulleys d, e, both of which are loose on the shaft X, but
the driving pulley d is keyed on a boss cast or fixed on the spur
pinion f, which gears into the spur wheel on the shaft V. The
wheel g is keyed on a
pinion runs loose on the shaft X and the
boss cast on the pinion h, which runs loose on the shaft. V and gears
into the wheel i, which is keyed on the shaft X and therefore rotates
it, and the pinion which is also keyed on the shaft X gears into
the wheel, which is keyed on the shaft V and actuates the cutting
discs U. The gearing for driving the table A is placed at one end
of the bed plate C, as shown in Figure 1, and is actuated by a variable
speed cone which is fixed to a disc m keyed on the boss of the
pinion p; a similar variable speed cone F is placed on the shaft G
and is driven by a strap from the cone L. The shaft G also carries
the toothed pinion H and wheel I, which are fixed to the boss Q and
are arranged to drive the shaft K in the following manner:-When
the table A requires to be travelled at a slow rate as would be necessary
when making a thick or heavy cut or when operating upon a hard
quality of stone, the driving belt is placed upon the largest part of
the speed cone F so as to drive the shaft G and pinion H at the
slowest speed. The pinion H by gearing into the toothed wheel I, actuates
the shaft K on which are placed the two tangent screws a and b shown
at Figure 2, these gearing into the worm wheels M and M' on the
screw shafts N and N¹ respectively cause the revolution of these screw
shafts which passing through corresponding nuts O and O¹ shown in
detail in plan at Figure 3, the nuts O and O' being again held in
the frame or bar P attached to the under side of the table, it is obvious
that when the screws N and N¹ revolve the table A is traversed. When the
cut on the piece or pieces or blocks of stone, slate, or marble operated
upon is completed it becomes necessary to reverse the action upon the
screws N and N for the purpose, of bringing back the table A into
position to commence the new cut; to do this in as short a time as
possible the pinion H is taken out of gear with the wheel L by
slackening the pinching screw. c in the boss Q, to which both it as
well as the wheel I are attached, and then sliding the boss together
with the wheel I and pinion along the shaft G until the wheel I comes
into gear with an intermediate wheel R not seen in Figure 1, but
indicated in the diagram of the reversing gearing at Figure 4. The

page_text: wheel R gears into the pinion S on the shaft K, so that as the wheel I
revolves it causes a rapid revolution of the shaft K and also the screws N
and N³ in a reverse direction, bringing the tables A into position to com-
mence a new cut, and as soon as the tables are brought back to that position
the pinching screw is again loosened and the pinion H
the wheel L, as shown in the plan Figure 1.
put into
gear with
In place of the screws N, N', racks or chains may be employed to
traverse the table A according to the class of stone operated upon.
At Figure 2 are shown on either side of the table A the clips T which
catch under the edge of the slides B and by which the tables are kept firmly
down upon the bed.
Figure 5 is a front view of a cutting disc showing the method of fixing
the same on the revolving shaft of the dressing machine. The shaft A is
formed with a dovetail slot in it into which the dovetail head of a stud or
bolt B fits, a screw thread is formed on it and provided with a nut as
shown by which the collar C is fixed tight on the shaft A in any required
position.
Figure 6 is a section, and Figure 7 a side elevation showing another
method of fixing the discs to the revolving shaft, it consists in fitting a key
or feather a into the shaft 6 and forming a corresponding groove in the
interior of the boss of the collar c, which slides over the feather a and is
fixed by means of a jib and cotter & which is driven tight between the boss
of the collar c and the feather a, as shown in Figure 7.
Figure represents another method of fixing the discs. In this
modification a feather a is fitted into the shaft b, and on it the collar c
is held by a pinching screw d tapped into the boss, diametrically opposite
to it another pinching screw e is tapped into the boss and is screwed tight
against the clamp f which is fitted into a recess in the boss so that it may
slide along the shaft with the boss when the position of the disc requires
to be shifted.
Figure 9 is a side view, and Figure 10 is a section of a cutting disc in
which the tool holders a are fixed round the face of the disc b instead of
round the edge as shown in Figure 5.
The method of fixing the tool holders into a disc of the construction
shown in Figures 9 and 10 is shown in Figure 11; a, a, are tool holders,
and b, the cutting tools which are formed with a projection on the
back which fits into a corresponding groove formed in the face of

page_text: the holder; c is a gripping piece by which the tools are armiy
wedged in and which slide upon the face of the disc, as shown in
Figure 3.
When the tools 6 require to be replaced the gripper c is forced out
by a lever such as shown in Figure 12, the pins d, d, being made to
fit into the holes e, e, in the tool holders a and gripping. piece c; a
slot fis formed in the gripping piece of sufficient length to allow of
the tool b being taken out by the notch g, and a pin h is fixed to the disc
to prevent the gripping piece falling out of position when the tools are
removed.
Figure 13 is a side elevation, and Figure 14 is an end elevation of a tool
holder which may be used in discs constructed according to Figure 5. a is
the holder, and 6 the tool; c is the gripping piece which fits into a check
taken out of the holder, the edges of the holder may be formed straight as
shown in firm lines, or a shoulder may be formed as shown in dotted lines,
which fits down upon the edge of the disc in which they are fitted; a semi-
circular hole d is cut in the bottom edge of the holder by which it may be
driven out of the disc.
Figure 15 shows another modification of tool holders in which the
gripping piece c fits in between the edge of the tool holder a and the
disc e.
Figure 16 is a side elevation of another modification in which the disc a
is formed to receive the tool 6 and the gripping piece c. In this case the
gripping piece is removed or fixed by a lever shown in Figure 17, on the
face of which there is fixed a pin or stud d of an elongated form which fits
into a corresponding hole formed half in the gripping piece c and half in
the disc a, as shown at e, Figure 16.
A form of tool holder is shown in Figure 18 in which two tools or
cutters may be fixed, as shown in Figure 19, which is a front elevation of
the holder. In this case the tools are placed in a check or notch in the
holder a and the gripping piece c by which they are held is hinged to a
stud d fixed in the holder a as shown, so that the gripping piece c acts as
a lever, the gripping power being obtained by means of a screw c which is
tapped into the gripping piece or lever c and acts against the face of the
holder a.
Figure 20 is a side elevation; and Figure 21 is a front elevation of a
holder for one tool; in this arrangement the tool b is held by a lever c
which is secured by a bolt d screwed into the holder a.

page_text: Figure 22 is a side elevation, Figure 23 is an end elevation, and
Figure 24 is a plan of a bracket by which the blocks of stone, slate,
or marble are held on the table of the cutting machine, the brackets
themselves being fixed on the table by means of a cruciform projection a
which fits into corresponding holes formed in the sliding table A,
Figure 1.
Figure 25 is a side view of a serrated disc or circular saw formed
of chilled cast iron used in shaping or dividing blocks of stone, slate,
marble, or other material, for which purpose it is fixed on a spindle
in the manner of wood-cutting circular saws, or it may be otherwise
fixed.
Figure 26 is a side view of a rectangular or straight saw formed of chilled
cast iron to be used in cutting rocks of a soft or friable quality, for which
purpose it is held in a reciprocating frame.
Figure 27 is a side view of part of a serrated disc, each serration a form-
ing one of the jaws of the tool holder, and the tool b is held by a gripper c
which is secured by a screw d.
On Sheet 2 of the Drawings Figure 1 is a side elevation, Figure 2, an
end elevation, and Figure 3 a plan of a machine to be employed for cutting
stone or other material into such shape as is employed for copes, string
courses, pillars, and other similar purposes.
The machine consists of a table A, which travels on antifriction
rollers B supported on the bed plate C. The table A is traversed by
screws D in the manner herein-before described in reference to the
machine shown in Figures 1 and 2, Sheet 1; the principal difference
between it and the machine shown on Sheet 2 consists in employing
two pedestals E, E, fitted with raising and lowering screws F for the
purpose of elevating or depressing the brackets G which carry the
shaft H, on which the dressing roller I, and the cutting discs J are
fixed. The screws F and the shaft H on which the dressing rollers
are fixed are driven from the vertical shaft K placed at one side of
the machine. On one end of the shaft H a bevel wheel L is keyed
which gears into a bevel pinion M placed on the vertical shaft K;
the pinion M is not keyed on the shaft K but slides upon a feather a
fitted into the shaft, and is supported by the bracket N which is
bolted to the sliding bracket G, so that as the shaft H is raised or
lowered by the screws F the pinion M slides upon the shaft K and
is kept in gear with the wheel L. On the upper end of the vertical

page_text: shaft K a toothed wheel O is fitted which gears into a toothed wheel O
fitted on the screw shaft F and revolves it, the screw on the opposite side
of the machine being actuated by the bevil pinions 6 fitted on the screw
shafts F and the cross shaft l'. When preparing the machine for work
and setting the drum shaft H to the proper height the screws F may be
thrown out of gear with the vertical shaft K by means of the clutch c and
operated quickly by the hand wheel Q which is fixed to the cross
shaft P.
The arrangement of gear for working the different parts of the
machine is as follows:-When the machine is to be used as a cutting
machine, for which purpose the saw R is used, S is the first motion
shaft on which the pulleys T, T', are fitted loose, but the driving
pulley T is keyed on the boss of the pinion U, which gears into the
toothed wheel U¹ keyed on the shaft V and rotates the clutch pinion W
gearing into the wheel W' keyed on the shaft S, which also carries
the bevil pinion X gearing into the wheel Y which actuates the
vertical shaft K and drives the drum shaft H in the manner herein-
before described. When the dressing drum or barrel 1 or the dressing
disc J is to be operated V is the first motion shaft and the driving
pulley which actuates it, the shaft S being rotated by the piuion W
gearing into the wheel W₁. The traversing screws D are actuated by
the bevil wheels c fitted on the end of the screw shafts D and on the
countershaft D which is rotated by the pinion d; on the shaft D³ gear
ing into the wheel on the shaft D¹ the other parts of the driving
and reversing gearing for traversing the table on the
same as herein-before described in reference to Figures and 2,
Sheet 1.
slow is the
After the block of stone or other material has been dressed by the
revolving drum it may be planed or smoothed by tools such as are shown
in Figures 4, 5, 6, and 7; these tools are carried in a tool holder f fitted
on the shaft g which is carried in the brackets 7', and may be lowered or
elevated by the screws shown dotted on Figure 1. The screws hare
operated by tangent screws i fixed on the cross shaft which gears into the
worm wheels k, the cross shaft j being rotated by the hand wheel l. As
a quicker feed is required when planing the shaft D¹ is driven direct
from the shaft V on which the pulleys m, m', are keyed, one of which
m operates the pulley n with an open belt and gives the forward
motion, and the other m² operates the pulley n¹ with a cross belt

page_text: and gives a reverse motion. The pulleys n, n¹, are provided with
clutches, by which they may be thrown out of and into gear as
required.
Figure 8 is a side view of a dressing barrel used in dressing door steps
or stair steps; Figure 9 is a transverse section through the barrel; and
Figure 10 is a end view of the same.
The part of the barrel employed in dressing the plain faces of
steps a, b, c, is built up longitudinally of separate discs or sections e,
as shown in Figure 8; the parts d which runs the "bottle bead" on
the front of the steps are formed by themselves, so that they may be taken
off and the body of the barrel lengthened by adding additional sections,
as it would be inconvenient to remove the drum shaft H from its bearings
to allow of the sections e being put on or taken off; this is effected by
forming the sections or discs e in halves, which are held together
by dovetail tongues f, as shown in Figure 10. The face of the roller
is grooved, as shown in Figure 9, to receive the tools which are held
by the gripping pieces or jaws g. If the steps are to be finished in
a better style of work than can be produced by the dressing barrel
they may be finished by planing. Figure 27 is a tool constructed for
planing the breast of the steps, and Figure 28 is a tool for planing the
"bottle bead."
The dressing barrel may also be arranged to work in a vertical position
as shown on Figure 11, on which a is the dressing barrel and b the block
of stone or other material to be dressed, which is carried upon a traversing
table c and fastened by holding brackets and pinching screws as shown
at d. The drum is driven by the toothed wheel e fixed on its axis, and
to prevent the chips from falling into the gearing a circular guard f is placed
over it.
Figure 12 is a side view, and Figure 13 an end view of a barrel for
dressing plain bevel" copes or copping stones. The tools are fitted into
the barrel in the manner herein-before described in reference to Figure 9,
and held by the jaws which pass over eye bolts or studs h fixed into the
barrel e and are secured by the wedge i. The dotted lines j, j, Figure 12,
show the circular planes which are generated by the revolution of the barrel
and the form of the "cope" produced.
Figure 14 is a side view of a barrel for dressing semicircular cope stones,
columns, or cylinders, plain or fluted, the details of which are the same as
the dressing barrels herein-before described.

page_text: Figure 15 is an end view, and Figure 16 is a side view of a dressing
barrel, in which tools a formed of blocks of steel or chilled cast iron
in section of the form known as "angle iron" are fixed; these tools
are shown in Figures 17, 18, and 19, and Figures 20, 21, and 22 are the
respective sections of the same. One edge of these tools are formed
into sharp projections a which are used for roughing out the blocks
of stone or other material, and the other edge 6 is made plain and
employed to produce a smooth or finished surface.
Figure 23 is an end elevation, and Figure 24 a side elevation of a
holding bracket for securing the blocks of stone or other material on
the traversing table of the dressing machine, and Figures 25 and 26
are views of a bracket for the same purpose.
Having now described the nature of my said Invention, and the manner
in or under which the same is or may be used or practically carried
into effect, I would observe in conclusion that what I consider novel
and original, and therefore claim as the Invention secured to me by
the herein-before in part recited Letters Patent is,―
First. The arrangement of feed gear shown at Figures 1 and 2,
Sheet 1 of the Drawings, by means of which one driving belt only is
requisite to drive the table A forward and to reverse it as herein-before
described.
Second. The arrangement and construction of discs with the cutting
tools mounted as shown at Figures 9 and 10, on Sheet 1 of the Drawings,
and as herein-before described also in another form and marked by
the letter J, Figure 2, Sheet 2.
Third. The several arrangements and constructions of holders in
which the tools are gripped or held by means of wedges, together
with the levers for actuating them, as shown at Figures 11, 13, 14, 15,
16, 19, 20, 21, and Figures 12 and 17 respectively on Sheet 1 as herein-
before described, or any mere inodification thereof.
Fourth. The construction of a disc with serrated edges as shown at
Figure 27, Sheet 1, and in which each serration constitutes one of
the jaws by which the tools are held in their place, as herein-before
described.
Fifth. The serrated disc or saw made of chilled iron and the straight
blade or saw also formed of chilled iron to be used for cutting stone,

page_text: slate, marble, or other material as shown in Figures 25 and 26, Sheet 1,
as herein-before described.
Sixth. The general arrangement of machinery or or apparatus for
cutting or dressing stone, slate, marble, or other material as shown at
Figures 1, 2, and 3, Sheet 2, and herein-before described.
Seventh. The arrangement and construction of barrels as shown
at Figures 8 to 16, Sheet 2, and the means by which the tools are
held therein, also the forming of the sections of such barrels in semi-
circular pieces, and the fixing of such pieces together by dovetail slips,
as herein-before described.
Eighth. The tools for dressing and cutting stone constructed of
chilled iron or steel as shown at Figures 17 to 22, Sheet 2 of the
accompanying Drawings, and as herein-before described.
In witness whereof, I, the said Archibald Munro, have hereunto
set my hand and seal, this Twenty-eighth day of October, One
thousand eight hundred and sixty-eight.
ARCHIBALD MUNRO. (L.S.)