Improvements in or relating to Apparatus for Sawing and Outting Stone, Slate, or like Materials.
Year: 1896

page_text: Date of Application, 15th July. 1896-Accepted, 14th Nov., 1896
COMPLETE SPECIFICATION.
Improvements in or relating to Apparatus for Sawing and Outting
Stone, Slate, or like Materials.
I, LUCIEN LÉONCE PICHERY of Avrillé par Angers, in the Republic of France, 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 :-
The object of the present invention is an apparatus for sawing or cutting stone,
slate or like materials more especially for use in slate quarries in order to obtain
regular blocks and to avoid waste as much as possible.
In the accompanying drawing.
Figs. 1, 2 and 3 represent such a sawing apparatus, partly diagramatically;
Figs. 4 and 5 show the saw itself and the method of fixing it to the apparatus..
The apparatus enables the saw to be used in three directions perpendicular to each
other, and consists of a frame XX which has two lateral longitudinal pieces A. On
the inner surface of the latter are fixed toothed racks ZZ, with which engage two
pinions, simultaneously driven by a toothed wheel R, itself driven by a motor, and
which cause lateral movement of a slide B. In the latter slides at right angles to the
longitudinal axis of the frame, a second slide (adjustable by hand and carrying
the saw fixed to the shaft E.
On the slide B is mounted a motor of any suitable kind (preferably an electric
motor) which works the whole apparatus. As the form, nature and size of the motor
does not matter, it is not represented on the drawing for the sake of simplicity. This
motor drives the shaft a; by means of the shaft band toothed or worm wheels F G H I
the saw D is caused to rotate, worm wheels K L M driving at the same time the
wheel R which as before mentioned moves the slide B parallel to the longitudinal axis of
the frame by means of the pinions and racks.ZZ. The motor causes therefore
simultaneous rotation of the saw and lateral movement of the slide B. But it must be
remarked, that the slide is caused to move preferably in such a manner as to be able
to he stopped without necessitating stoppage of the motor or of the saw driven by it.
This is effected for instance by the worm K not being fixed to the shaft b but being
caused to rotate simply by friction on that shaft. Such arrangement not only allows
the slide B to be stopped by hand, but it also works automatically (that is to say lateral
movement of the slide stops) as soon as the saw meets with too great a resistance.
The slide C is moved forward or backwards by hand by means of a screw d and a
wheel N (Fig. 1). On its front end the slide carries a vertical shaft E, to which is
secured the saw D; as this shaft E is provided at its upper end with a screw thread,
it and consequently the saw can be raised or lowered simply by turning a nut O.
The worm wheel I is of course so mounted on the shaft E, that the latter is free to
rise or to descend without altering the position of the wheel 1.
The same remark applies to the toothed wheel F, which can slide on the shaft b
when the slide C moves relatively to the slide B.
Figs. 4 and 5 show the shape of the saw D and the manner in which it is fixed.
It is provided in the middle with a sufficiently strong boss in order to prevent the
nut fixing the saw to the shaft E from projecting beyond the outer surface of the
former. This manner of fixing is very simple and strong and allows the quarry
to be worked without any chippings.
From Figs. 2 and 3 it is clear how the saw thus fixed comes to lie flat against the
stone.