IMPROVEMENTS IN MACHINERY FOR CUTTING OR DRESSING STONE, AND IN APPARATUS CONNECTED THEREWITH
Year: 1880

page_text: LETTERS PATENT to Marshall Jones Brooks, of Sunnyside, Rawtenstall, in the
County of Lancaster, for an Invention of "IMPROVEMENTS IN MACHINERY
FOR CUTTING OR DRESSING STONE, AND IN APPARATUS CONNECTED
THEREWITH,"
"
PROVISIONAL SPECIFICATION left by the said Marshall Jones Brooks
at the Office of the Commissioners of Patents on the 6th February 1880.
MARSHALL JONES BROOKS, of Sunnyside, Rawtenstall, in the County of Lancaster.
IMPROVEMENTS IN MACHINERY FOR CUTTING OR DRESSING STONE AND IN
APPARATUS CONNECTED THEREWITH."
My Invention consists in improvements on the Patent granted to C. Coates,
No. 3354, November 27th 1867.
In performing my Invention I fix the stone to be operated upon on a table to
which a to and fro motion is given by steam or other power, or the stone may be
stationary and the cutters with their frame traversed. The cutters cut in both
directions as they are put in motion by contact with the stone. The cutter blocks
or cutters are held in one or more carriages which slide on ways parallel to the table
on which the stone is held.
The cutters are discs mounted on studs or shafts, and so set that they project one
beyond the other, so that each successive cutter disc removes an extra cut from the
face of the stone under operation, or the cutters may be of the same diameter.
The cutter block or blocks are traversed across the face of the stone by a self-
acting motion or otherwise.
The cutters when at work are placed perpendicular to or at an angle with the
stone.
One or more cutter blocks may be used on the same slide, and if necessary more
than one slide for cutters may be used.
The slides on which the cutters are mounted are provided with a motion to raise
and lower them for the purpose of bringing the cutters into' contact with the
stone.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Marshall Jones Brooks in the Great Seal Patent Office on the
5th August 1880.
MARSHALL JONES BROOKS, of Sunnyside, Rawtenstall, in the County of Lancaster.
"IMPROVEMENTS IN MACHINERY FOR CUTTING OR DRESSING STONE, AND IN
APPARATUS CONNECTED THEREWITH."
My Invention consists in improvements on the Patent granted to C. Coates,
No. 3354, November 27th 1867.
In performing my Invention I fix the stone to be operated upon on a table to
which a to and fro motion is given by steam or other power, or the stone may be
stationary and the cutters with their frame traversed. The cutters cut in both
directions as they are put in motion by contact with the stone. The cutter
blocks or cutters are held in one or more carriages which slide on ways parallel
to the table on which the stone is held. The cutters are discs mounted on
studs or shafts, and so set that they project one beyond the other, so that each
successive cutter disc removes an extra cut from the face of the stone under
operation, or the cutters may be of the same diameter. The cutter block or
blocks are traversed across the face of the stone by a self acting motion, or otherwise.
The cutters when at work are placed perpendicular to or at an angle with the stone.
One or more cutter blocks may be used on the same slide, and if necessary more
than one slide for cutters may be used. The slides on which the cutters are mounted
are provided with a motion to raise and lower them for the purpose of bringing
the cutters into contact with the stone.
And in order that my Invention may be fully understood and readily carried
into effect, I will describe the accompanying two Sheets of Drawings, reference being
had to the figures and letters marked thereon.
On Sheet 1, Fig. 1 is a side elevation, and Fig. 2 is a front elevation of a stone
dressing machine to which my Invention is applied. a is the frame; b is the
carriage on which the stone c is secured by the clamps d; e is the cross frame on
which is bolted the bracket e¹, carrying the worm which actuates the sector; the
bosses are cast with e, and they carry the cross shaft e³, on which the arms et
swing. All these parts are, or may be, made as usual; e³ is the lower cross shaft
fixed in the arms e¹; f is a tool box or cutter block which is made to slide on the
shafts and e, and it is traversed by the screw g. On the tool box f is formed a
bearing for the cutter shaft f¹, on which are fixed the circular cutters f, the cutters
are placed at an angle of about 45° or any other angle to suit the hardness and
quality of the stone to be dressed. The front part of the tool box f, in which is the
bearing for the shaft f', is adjustable in order to vary the angle of the cutters f
when required. At one end of the screw g is the pinion g¹, into which gears the
spur wheel g², working loose on the shaft e; to the spur wheel g² is fixed the ratchet
wheel g³, actuated by a catch on the lever g' which is connected by a link to the
elbow lever g³, to one arm of which are attached a weight and spring; keyed on to
the same shaft as the elbow lever g³ is the lever ge; a pin g7 on the carriage b strikes
the lever go at each inward run of the carriage, thus communicating motion to the
screw g, and traversing the tool box f, and with it the cutters f² and h², the
requisite distance for a fresh cut. On the side of the tool box f is fixed a bracket h,
in which is the shaft h'; on the lower end of this shaft are formed a pair of jaws
which carry the cutters h² fixed on a short shaft which revolves in bearings in the
jaws. The shaft h¹ is raised or lowered by the screw h³ to bring the cutters h² to
the surface of the stone to be dressed. The cutters are placed vertical to the
surface of the stone, and work after the cutters f' in order to give a finishing cut to
the stone. m is a sliding wedge made of any suitable material, actuated by a

page_text: screw and nut to raise the stone to be dressed to the level required for the cutters
to operate upon it.
Fig. 3 shews my improved arrangement of vertical cutters revolving on the
shaft e, and held between jaws moved by the screw g, which traverses the cutters
along the shaft eª.
Fig. 4 shews a similar arrangement, but with the cutters fixed on a bush on the
shaft e".
Fig. 5 shews my improved arrangement of vertical cutters held in jaws carried by
a tool box or cutter block sliding on the shafts e³, and e³.
On Sheet 2, Fig. 6 is a side elevation, and Fig. 7 is a front view of a machine to
which the second part of my Invention is applied. i is the tool box; ¹ are the
cutters which rest at an angle on the stone c, and 2 are the vertical cutters similar
to those shewn on Figs. 1 and 2, but set transversely instead of parallel to the
table of the machine. 3 and are shafts fixed in bosses; on the frames j¹; these
frames are raised and lowered on the slides by the screws ³, which are actuated
by a hand wheel and bevil gears. To the tool box i is attached the link or
connecting rod k, which is actuated by a steam engine or other motor, and
communicates a transverse motion to the tool box and cutters, the cutters being
moved rapidly across the surface of the stone c on the table of the machine. The
cutters cut in both directions as they are caused to revolve by contact with the
stone. The table carrying the stone is fed forward by a rack and pinion after each
operation of the cutters. The tool box i may work on V slides or otherwise, instead
of on shafts as shown.
Although I have shewn cutters of different diameters on one shaft, so that
each cutter may take a deeper cut than the one preceding it, the same object may
be effected by placing cutters of the same or different diameters on different
shafts.
Having thus stated the nature of my Invention, and described the manner of
performing the same, I wish it to be understood that I do not limit myself
to the details given, as they may be varied or modified, but what I claim is,-
First. The arrangement of circular cutters, either at an angle or vertical to the
stone being dressed, so that each successive cutter shall take a deeper cut than the
one preceding it, as shewn and described.
Second. The combination of cutters set at an angle with vertical cutters,
substantially as shewn and described.
Third. The combination of circular cutters of different diameters with circular
cutters of the same diameter working on the same shaft or bush, as shewn and
described in reference to Figs. 3 and 4.
Fourth. The improved tool box or cutter block for carrying the cutters, and the
mechanism for actuating the screw for traversing the same, as shewn and described
in reference to Figs. 1 and 2.
Fifth. The wedges actuated by screws for raising the stone to the level required
for the cutters to operate upon it, as shewn and described in reference to
Figs. 1 and 2.
In witness whereof, I, the said Marshall Jones Brooks, have hereunto set
my hand and seal, this Tbird day of August. One thousand eight hundred
M. J. BROOKS. (L.S.)