Improvements in Machines for use in the Manufacture of Stone- cutting and other Chisels.
Year: 1890

page_text: Date of Application, 25th Feb., 1890-Accepted, 29th Mar., 1890
COMPLETE SPECIFICATION.
Improvements in Machines for use in the Manufacture of Stone-
cutting and other Chisels.
We, JOSEPH O'BRIEN, Master Blacksmith, of No. 56 Yeoman Street, and JEREMIAH
CAREW, Master Stone Cutter, of No. 23 Arcadia Street, and both of the City of
Boston, in the County of Suffolk and State of Massachusetts, United States of
America, do hereby declare the nature of our 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 relates to stone-cutting chisels particularly those technically known
as marteline chisels, and which have a toothed cutting edge and it pertains to a
machine for cutting the teeth of the tools. The machine of this invention, in
substance, is composed of a series of circular cutting ribs held on a common
horizontal shaft suitably supported and rotated and a stationary horizontal die-plate
held and supported at one side of and having, at its edge toward said rotating cutting
ribs, vertical ribs which enter into the open spaces between said cutting ribs and all
so that the chisel placed upon said die-plate with its edge to be toothed presented to
said rotating cutting ribs teeth will be cut in said edge by the operation of said
cutting ribs, substantially as hereafter described. Further than the above, the
invention consists in certain improvements in detail for the better adjustment of the
working parts of the machine and guidance or direction of the tool to be cut by its
operation, all substantially as hereafter described.
In the drawings, forming part of this specification, a machine (on a reduced scale)
of this invention is illustrated, having a series or setts of rotating tooth cutting ribs
and companion vertical ribbed die-plates entering into the spaces between the cutting
ribs of each sett.
Figure 1 is a plan view. Figure 2 is a central longitudinal vertical section..
Figure 3 is a transverse vertical section, line 3-3, figure 1. Figure 4 is a vertical
section in detail, line 4-4, figure 1. Figure 5 is a plan view of a die-plate of the
machine, enlarged. Figure 6 is a side face view of a tool, one balf full size.
In the drawings, the supporting frame-work of the machine consists essentially of
end-uprights and an intermediate upright A, A³, A³ and a horizontal table or
platform B which is supported by said uprights and along its central portion B' is
open. C is a horizontal shaft supported and turning in suitable bearings of the
uprights and located in the open central portion B' of the table B.
This shaft C, at each of its opposite end-portions and between the intermediate and
end-uprights carries two setts of circular steel ribs, in all four setts D, D³, D³, D*
which are severally held on the shaft C in any suitable manner so as to rotate
therewith. The several ribs of each sett of ribs are uniformly separated, and each rib
in cross section and at all points of its circumference is of V shape, with the apex
outermost and both the side and the apex faces of the V are indented similar to the
cutting or abrading faces of files and thereby each rib is made suitable to cut metal
as will hereafter appear in the description of the operation of the machine.
E is a pulley held on shaft C and to be belted (not shown) for driving the shaft.
F F, F, F are steel die-plates severally held on the table B, at one side of the
setts of cutting ribs D, D³ D³, D', and one at each sett. Each die-plate is horizontal
and is received in a way G of and is flush with the table B, running across the table
and at right angles to the axis of rotation of the cutting-ribs. Each die-plate has a
central slot G³ running lengthwise of the way G, and G is a headed screw threaded
bolt, passed through and engaged by its head with the slot G³ and thence through the
table to the under side thereof where it receives a screw threaded nut G, which being
screwed or set up against the under side of the table fastens the die-plate firmly to

page_text: the table in whatever position it may have been placed. Each die-plate at its vertical
edge toward the cutting ribs of the sett thereof to which it belongs, has a series of
vertical ribs H entering into the spaces between the separate cutting ribs of the
setts D, D2, D3, D*.
J is a guide or gauge having a lengthwise slot Jª and secured by screw threaded
bolts J and nuts J to the table. A guide is provided for each set of circular cutting
ribs and adjusted it serves as a side rest and bearing for the chisel to guide it in its
presentation to the cutting ribs to be cut as hereafter appears.
A chisel K having its edge K2 shown in figure 6 as having a series of teeth, uncut,
is placed upon a die-plate of the machine described with its edge K2 toward the
cutting ribs suitable for the size of teeth desired and at a bearing against the gauge J
belonging to said ribs, on which, the ribs being under rotation, the tool is moved
gradually toward the ribs, and thus said edge is by the abrading and cutting faces of
the ribs cut with a series of teeth corresponding substantially in size to the open
spaces between the ribs, and in depth either equal to or less than the depth of the
cutting ribs according to the distance which the tool is fed forward as described.
The die-plates attached as described can be readily adjusted in position and
removed and replaced with others when so desired. Again the cutting ribs, may be
separate disks or plates, bound in a sett together on the driving shaft C in any suitable
manner but they may be severally in one piece of metal.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
First. The combination of a series of circular ribs each having a V shaped edge.
with cutting or abrading faces and severally held on a common rotating and suitably
supported shaft and a stationary die-plate supported at one side of and having ribs
entering into the spaces between the cutting edges of said circular ribs, substantially
as described, for the purpose specified.
Second. The combination of a series of circular ribs each having a V shaped edge
with cutting or abrading faces and soverally held on a common rotating and suitably
supported shaft, a stationary die-plate supported at one side of and having ribs
entering into the spaces between the cutting edges of said circular ribs, a slot G³ of
said die-plate, a headed screw threaded bolt G³ entered through and engaged by its
head with said slot of the die-plate, and also passed through the die-plate support and
a screw-threaded nut G* screwed onto said bolt, to bind the die-plate to and release it
from its support, substantially as described, for the purposes specified.
Third. The combination of a series of circular ribs each having a V shaped edge
with cutting or abrading faces and severally held on a common rotating and suitably
supported shaft, and a stationary die-plate supported at one side of and having ribs
entering into the spaces between the cutting edges of said circular ribs, and an
adjustable gauge J held on the support for said die-plate, substantially as described,
for the purposes specified.
Dated this Ninth day of September A D 1889
JOSEPH O'BRIEN.
JEREMIAH CAREW.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicants.