IMPROVEMENTS IN MACHINERY FOR DRESSING OR CUTTING, SHAPING AND FINISHING STONE
Year: 1874

page_text: PROVISIONAL SPECIFICATION left by William Robert Lake at the
Office of the Commissioners of Patents, with his Petition, on the
21st March 1874.-A communication from abroad by Alonzo Stock-
bridge Gear, of Boston, Massachusetts, United States of America.
t
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lako̟, & Co.,
Patent Agents, Southampton Buildings, London, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN MACHINERY FOR DRESSING
OR CUTTING, SHAPING AND FINISHING STONE," a communication, to be as
follows:-
The said Invention relates to the general organization and to details of
construction of a machine for dressing, or cutting, shaping, and finishing
stone, the said machine using as the reducing agent a tool provided with
carbon points as cutters. This tool has a cutter head fixed on the end
of a horizontal shaft or arbor; the outer face of this head is flat or disc
shaped; the cutters extend peripherally and forward from such face; and
the carbon or cutting points are fixed in the ends of radial stocks,
I confine the said stocks in position by making each with a dovetail to
enter a dovetail mortice or groove in the back surface of a plate which

page_text: forms the face of the head, and a pin to enter a circular groove in the
adjacent surface of the 'head, the plate being, confined to the head by a
suitable screw and nut mechanism, and by its confinement holding the
cutters firmly in position both radially and laterally, while by loosening
the plate any stock may be readily removed or replaced. This method
of applying the cutter stocks to the head forms one part of the said
Invention.
The arbor of the cutter-head turns in bearings in a vertically
adjustable carriage moving on the vertical guide ways of a horizontally
travelling carriage moving on the main rails or ways of the bed. This
carriage is operated by a feed screw or screw shaft turning in stationary
bearings, and geared to a driving shaft upon which are fast reversing and
loose pulleys driven by suitable shifting belts. Around a pulley on the
shaft of the cutter head runs a long belt which extends around a guide
pulley turning in bearings on the cutter carriage, thence around a :
driving pulley on a shaft turning in stationary bearings at one end of the
bed, which bearings may be vertically adjustable, and around another
guide pulley journalled in the pendant arms of a weighted swinging
frame at the opposite end of the bed; this pulley is kept. in position to
hold the belt taut as the cutter carriage moves by the weight of the
frame in which the said pulley is journalled.
One part of the said Invention consists in the organization thus
generally described.
The cutter head is composed of a sleeve, at the front of which is a disc
or face plate, a. collar, and a nut, the cutter stocks being placed between a
the face plate and collar, and the collar and plate being clamped
together and against the cutter stocks. The inner face plate is slotted
with radial and flaring slots, and the cutter stocks are formed with dove-.
tail shanks to fit into these slots, while the face of the collar adjacent to
the slotted face of the plate is made with a circular slot, each cutter
stock having a pin which enters the said slot. I
I modify the above machine by making each cutter stock dovetailed
and setting it in a dovetail recess, which recess is made in the inner face
of a disc fixed on the end of the arbor or in a step formed on such face;,
an outer disc is bolted down over the stocks by bolts passing through the
said outer dise; and into or through bosses cast on the inner face of tho
first disc; the stocks have pins extending into an annular groove in the.
face of the disc..

page_text: In the first described construction the back of the cutter head acts as
a wedge to pry off the chip when the cutters sink into the stock behind
its face. The wedge is driven within the arbor, and it requires no
rotative movement for its breaking off action, but I may modify this
part of my Invention by using a stationary wedge separate from the
arbor, the edge of the wedge extending to the periphery. of the disc. The
wedge may encircle the head or extend only partially around it. I also
use a flexible pipe which extends axially into the arbor, the arbor being
made tubular and the pipe connecting with a head of water supply.
The arbor tube extends through the disc and supplies water under
pressure between the discs, the water being of course thrown out to the
cutters and to the face of the work.