An Improved Process for Cutting Stone.
Year: 1890

page_text: Date of Application, 14th Jan., 1890-Accepted, 15th Feb., 1890
COMPLETE SPECIFICATION.
An Improved Process for Cutting Stone.
1, ALEXANDER MELVILLE CLARK of the firm of A. M. and Wm. Clark, of 53,
Chancery Lane in the County of Middlesex, Fellow of the Institute of Patent Agents,
do hereby declare the nature of this invention (a communication to me from abroad
by Emanuel Foerster of No. 403, East 108th Street in the City County and State of
New York United States of America, Manufacturer, 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 a process of dressing or cutting stone, according to which
I feed the stone to be cut, from behind the cutting tool or in the direction in which
the cutting tool moves to cut the stone.
In the accompanying drawings I have shewn means for carrying ont the process.
Figure 1 is a vertical longitudinal sectional elevation of a stone-cutting machine, and
figure 2 is a cross-sectional view of the reciprocating tools which I use.
In the drawing, the letter A represents the frame of the machine at the upper part
of which is suitably journaled a horizontal shaft B that is provided with an eccentric a.
The shaft B may be rotated in any suitable manner. D is a sliding reciprocating
tool-carrying plate that is guided in movable guides 6 carried by the frame A. The
reciprocating plate D is pivotally connected by straps with the eccentric a whereby,
when said eccentric rotates, the plate D will be reciprocated. e is an arm connected
with the strap d which arm is also pivotally connected by a link f with a sliding rod
whereby, when the rod g is moved, the reciprocating plate D will be swung or raised
and lowered.
g
E is a frame or track upon which a carriage F carrying the stone is adapted to
move. The frame E is adapted to be raised and lowered and is supported by screw
rods at the sides of the machine which are turned by suitable means so as to raise
and lower the track or frame E and thereby the stone-carriage F. i is a longitudinal
shaft that extends parallel with the track or frame E and is connected by gearing ;, l, m,
with the stone-carriage so that, as said shaft is rotated, the stone-carriage will be
moved longitudinally. The shaft i is connected by gearing n o p and q with the main
shaft B of the machine whereby the shaft i is driven.
The above construction and arrangement of parts is similar to that shewn in Letters
Patent of the United States of America, No. 392,601; granted to the said Emanuel
Foerster on November 13th 1888, and I therefore refer to such Patent for a more
particular and detailed description of the construction and operation of the before-
mentioned stone-cutting machine. But it is evident that the reciprocating plate D
may be actuated and the stone-carriage F raised and lowered and moved longitudinally
by means other than that shewn herein, if desired. G represents the cutting tool
which is carried by the reciprocating plate D in suitable manner.
In cutting the stone by this process and also in order that the tool will not chip or
break off the stone, as is done with stones that are fed toward the tool, I move the
stone from under the tool or, in other words, I move the stone in the direction in
which the cutting tool is moved to cut. For instance, supposing the cutting tool G to
be moved in the direction of the arrow in figure 1, to dress the stone, the stone is
moved in substantially the same direction, as indicated in said figure by the arrow a*.
When setting the stone to be cut, the stone is first placed under and behind the tool
and is then moved toward the tool in the direction of the arrow a or of the cutting
movement of the tool so that the edge of the stone will first be encountered by the
tool. As the tool is reciprocated and the stone is moved in the direction of the
arrow a', the tool will cut or dress the stone that is fed to it from beneath or behind,
thereby leaving a dressed edge on the stone in front of the tool, as shewn. As the

page_text: tool does not encounter a mass of stone in its front, but rather shaves the stone off
from behind, the stone will not be chipped or broken but an even cutting will be
effected. There being no part of the stone to be cut in front of the tool, there will be
no chipping of the stone.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
The process of dressing or cutting stone herein-described which consists in feeding
the stone to the reciprocating tool, in the direction of the cutting stroke of the said
reciprocating cutting tool, substantially as specified.
Dated this 14th day of Jenners 1000'
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.