Improvements in Tools for Working Stone, Slate, and Marble, and in Holders for the same.
Year: 1888

page_text: Date of Application, 2nd Oct., 1888
Complete Specification Left, 17th June, 1889-Accepted, 20th July, 1889.
PROVISIONAL SPECIFICATION.
Improvements in Tools for Working Stone, Slate, and Marble, and
in Holders for the same.
I, LUCIEN PICHERY, of Combrée, in the Republic of France, Director of Quarries,
do hereby declare the nature of this invention to be as follows :-
This invention relates to tools used for cutting and dressing stone, slate, or
marble, and especially such materials of irregular hardness such as schistose slate in
which very hard sulphurets are often found.
For this purpose a revolving tool is used carrying a sufficient number of cutting
instruments of suitable shape, so. arranged that they can be easily removed and
replaced, whilst they are very firmly held with little flexibility or spring.
The cutting tools are mounted in a holder and vary more or less in shape according
to their number and the character of the work which they have to do. The wear
of each is less as their number increases, and there may be from two to ten of them
according to the size of the holder which itself depends upon the character of the
work to be done.
Their circumferential speed for schistose slates should be about 12 centimètres
per second, which may be increased or diminished according to the character of the
material operated upon.
The machine to which the improved cutters and holders are applied may be of any
of the usual kinds, in which the revolving cutter spindle is carried by a moveable
carriage and can be raised or lowered by means of a screw to alter its cut.
The tool holder is made capable of revolving either horizontally or vertically so
as to do all kinds of work, and the cutting edges of the tools may be made of any
desired shape.
The holder consists of a strong disc or block of metal fixed upon or forming
part of the revolving spindle and having two or more holes through it, preferably
square, into which the tools are fitted and are firmly fixed by set screws,
straight tools being used for horizontal work, and bent or cranked tools for vertical
work.
For cutting mouldings the edges of the tools are formed to the desired shape of
the moulding.
By the arrangement described the same holder can be used for all kinds of
work
•
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Inventor.
COMPLETE SPECIFICATION.
Improvements in Tools for Working Stone, Slate, and Marble, and
in Holders for the same.
1, LUCIEN PICHERY, of Combrée, in the Republic of France, Director of Quarries,
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be particularly described and ascertained in and by the following
statement and accompanying drawings (that is to say):-
:-
This invention relates to tools used for cutting. and dressing stone, slate, or marble,
and especially such materials of irregular hardness such as schistose slate in which
very hard sulphurets are often found.

page_text: For this purpose a revolving tool is used carrying a sufficient number of cutting
instruments of suitable shape, so arranged that they can be easily removed and
replaced, whilst they are very firmly held.
In order that the tools may operate effectually in treating and dressing stone of
varying hardness they should act by gradually chipping the stone away, and the
circular movement given to them is most effective for the purpose.
The tools should be. somewhat reduced in thickness towards their points, and
should project sufficiently from the holder to allow them to have a very slight
flexibility.
The cutting tools are mounted in a holder and vary more or less in shape
according to their number and the character of the work which they have to do.
The wear of each is less as their number increases, and there may be from two to
ten of them according to the size of the holder which itself depends upon the
character of the work to be done. Their circumferential speed for schistose slates
should be about 12 centimêtres per second, which may be increased or diminished
according to the character of the material operated on.
The machine to which the improved cutters and holders are applied may be of
any of the usual kinds such for instance as that where two carriages at right
angles to each other are used, the revolving cutter spindle being carried upon
one of them and being capable of being raised or lowered by means of a screw
to alter its cut.
The tool holder (as illustrated in figures 1 and 2 of the accompanying drawings)
may be made capable of revolving either horizontally or vertically so as to do all
kinds of work and the cutting edges of the tools (B B¹C C¹D) may be made of
any desired shape.
The holder consists of a strong disc or block of metal A. fixed upon or forming
part of the revolving spindle and having two or more holes through it,
preferably square, into which the tools are fitted and are firmly fixed by set
screws, straight tools being used for horizontal work, and bent or cranked tools
for vertical work.
For cutting mouldings the edges of the tools are formed to the desired shape of the
moulding (as illustrated in figure 5).
By the arrangement described the same holder can be used for all kinds of work,
the tools B, B', working horizontally, and the tools C, C, vertically.
The tools are carefully adjusted so that their cutting edges or points work
in the same plane, and they are preferably sharpened in a machine suitable for
the purpose.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
The tools for cutting stone, made, arranged, and used, substantially as described
and shewn in the drawing.
1
e drawing.
17th day of June 1889.
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Inventor.