Improvements in Stone Dressing Machines.
Year: 1892

page_text: Date of Application, 23rd Feb., 1892
Complete Specification Left, 23rd Nov., 1892-Accepted, 23rd Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Stone Dressing Machines.
I FRANK TRIER Civil Engineer, 19 Great George Street Westminster London
S.W. do hereby declare the nature of this invention to be as follows:-
My improvements relate to the construction of machines & toolholders for
dressing stone with circular rotating cutters, the principal object being to dress
two (in some cases three) adjacent faces simultaneously & to produce good arrisses
whilst the cutters are moving at right angles to the arriss to be produced-instead
of in the line of the arriss as hitherto practised.
I employ two slides working at an angle-ordinarily at right angles—to one
another & attach to each slide a cutter-holder carrying one or more than one
cutter. If one cutter I use for plucky stones my system of one cutter step-cutting-
if more than one, the cutters can be arranged side by side or concentrically to effect
step cutting. I construct the cutterholder for concentric cutters so that the bolt
which fixes the outer cutter to its bush, is made hollow & serves as the bearing of
the bush of the inner cutter.
For wide stones I make the slide wide enough to carry two or more than two
cutters or groupes of cutters placed at suitable distances apart, so as to reduce the
length of their travel.
I give where necessary the skew to the cutters automatically in either direction.
I impart to these two slides a reciprocating motion from two cranks which are
geared together, but can be disconnected or 1 employ a system of levers or other
suitable mode of drivage, but prefer the crank action to any other.
The movements imparted to the two slides are so adjusted relatively the one to
the other, that tho' dressing the adjacent faces & conjointly, producing the arriss at
the line at which the two surfaces meet & where the tracks of the cutters cross each
other the latter do not clash or interfere with one another.
In some cases a third slide with cutters may be used for dressing a third face of
the stone simultaneously with the other two-or I may duplicate the two slides
named above on the other side of the machine-in which case two slides would
work vertically & the cutters on the other two slides would be in line each dressing
half way across the horizontal face.
1 often mount on the slides carrying the cross cutting cutters a cutter with its
axis at right angles to the direction of the travel of the stone & with the help of a
fast feed of the table in both directions I am able with these cutters (one on each
slide) to set in the arrisses & partially dress the 3rd & 4th faces of the stone in the
usual way.
The preservation of the arriss, whilst the cutters on the two slides mentioned
above are moving at right angles to the arriss they conjointly produce is owing to
the support of the uncut stone on the adjacent surfaces & which is removed by the
alternate cuts of the cutters.
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COMPLETE SPECIFICATION.
Improvements in Stone Dressing Machines.
I, FRANK TRIER of 19 Great George Street in the City of Westminster Civil
Engineer 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 :-
My improvements relates to the construction of machines for dressing stone with

page_text: circular rolling cutters, the principal object being to dress two (in some cases three)
adjacent faces simultaneously and to produce good arrisses whilst the cutters are
moving at right angles (or approximately so) to the arriss to be produced instead
of in the line of the arriss as hitherto practised. When dressing two adjacent faces
of the stone being operated upon I employ two slides working at an angle ordinarily
at right angles to one another and attach to each slide a cutter holder carrying a
cutter or two or more cutters. If one cutter be used I prefer for plucky stones my
system of one cutter step cutting that is a cutter rough cutting when moving in one
direction and then being moved to a lower level to make a finishing cut when
moving in the reverse direction. If more than one cutter be used they can be
arranged side by side or concentrically to effect stepcutting.
For wide stones I may make the slide wide enough to carry two or more than
two cutters or groups of cutters placed at suitable distances apart so as to reduce
the length of their travel 1 give where necessary the skew to the cutters auto-
matically in either direction."
I impart to these two slides, a reciprocating motion from two cranks which are
geared together but can be disconnected, or I employ a system of levers or other
suitable mode of driving but I generally prefer the crank action.
The movements imparted to the two slides are so adjusted relatively the one to
the other that though dressing the adjacent faces and conjointly producing the
arriss at the line at which the two surfaces meet and where the tracks of the cutters
would cross each other if they were working in the same plane, the cutters do not
clash or interfere with one another. In some cases a third slide with cutters may
be used for dressing a third face of the stone simultaneously with the operations of
the other two or I may duplicate the two slides named above on the other side of
the machine in which case two slides would work vertically and the cutters, on the
other two slides would be in line each dressing half way across the horizontal face.
The accompanying drawing shews in side elevation a machine arranged according
to my invention to simultaneously dress two adjacent faces of a stone from which
its other arrangements as herein before mentioned will also be understood. K
and L are standards connected by the horizontal cross slide I in which the slide U
is mounted so that it can be moved horizontally therealong, the said slide U carrying
the slide M transversely adjustable therein and carrying the tool holder or box Q
and tool or cutter O for operating on the top side of the stone. The slide U is
operated by means of the crank disc b to the crank pin 2 of which a rod e is secured
the other end of the said rod being connected to the slide U by a centre pin
carried by a block adjustable in a slot in the slide by a screw u² as shewn the other
end of the said 1od e being also adjustable by mounting the pin 2 in a block
adjustable and fixable in a radial slideway 3. The one end of the rod can be thus
adjusted on the crank disc to suit the extent of surface on which the cutters are to
act and the other end of the said rod can be adjusted in the slot in the slide U so
as to bring the cutters to their correct working position relatively to the arriss to
be formed by the two surfaces to be dressed. Carried by or adjacent to the
standard L are guides in which the slide V can be moved vertically by the crank
disc a and rod f connected to the slide and disc similarly to the rod e. The slide V
carries an adjusting slide N carrying the tool holder or box R and tool or cutter P
for working on the vertical face of the stone similarly to the working of the tool or
cutter O on the top face of the stone, the one end of the rod f being adjustable on
the disc a by the pin a² being carried in a block adjustable and fixable in a slide a
and the other end being connected by a pin adjustable in a slot in the slide V
similarly to and for the same purpose as the adjustments mentioned with regard to
the rod e. The slides are shewn as being arranged at right angles to each other in
the drawing but for dressing faces which are not at right angles the slides can of
course be arranged at corresponding angles. I may make the slideways and
consequently the slides so that they can be adjusted and fixed at various angles as
desired.
The crank discs a & b can be driven in any convenient way but are so geared

page_text: together that the slides with their cutters do not come into contact with each other.
The crank discs can however be disconnected when it is desired to dress one face
only. In the drawing I have shewn the drivage effected by a band passing
over a pulley on the axis of the disc b the said axis having on it a toothed
wheel which gears with a toothed wheel c which in turn gears with a toothed wheel
on the axis of the disc a. The stone S is secured to the table T which is traversed
on the bed B by a screw or other suitable means the feed being given preferably
when the cutters are off the stone that is at or near the ends of their strokes.
The tool holders are shewn as being mounted by trunnions &r to the
boxes Q&R the tool holders being provided with horns q² & 2 which abut against
one or other of the stops (93 & 3) on the boxes or R according to the direction
in which the tools are tilted they being tilted in one direction for the forward
stroke and in the other direction for the reverse stroke of the tools. This is
automatically effected by means of rods 9 & h connected at one end to the tool
holder and passing through slots in the guide brackets i & j the said rods being
provided with stops (&) which come against the said brackets i & j at the end
of each stroke and alternately reverse the skew of the cutters or tools by tilting
them so that alternately the one and the other stops (72 & 3) come into contact
with their opposed stops q³ & ³ I have shewn but one cutter in each tool holder
but I may use more than one; for instance, concentric cutters or cutters side by
side cutting simultaneously at different levels. When a surface to be dressed is
very wide or long I may use two or more tools and tool holders and their carrying
slides placed at some distance apart upon a slide common to both, or all so as to
reduce the distance to be travelled by the main slide and consequently the throw of
the operating crank. I may use a third slide for dressing a third face of the stone.
To effect this I can use an arrangement like that shewn at the side of the stone
(in connection with the tool P) for operating on the opposite side or I can duplicate
the two arrangements of slides and cutters shewn in the drawing placing an
arrangement like that shewn in connection with the tool P at each side of the stone
and employing for the upper face of the stone a duplication of the arrangement
shewn in connection with the cutter O but making the tools O so provided each
dress only half way across the top face of the stone so that they between them
dress the whole top face whilst the duplicated cutters P operate on the respective
side faces of the stone.
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 :-
1. A stone dressing machine having two or more cutters arranged to operate
simultaneously upon two or more faces of the stone substantially as hereinbefore
described.
2. The arrangement and combination of parts constituting a stone dressing
machine substantially as herein before described and illustrated by the accom-
panying drawings.
Dated the 23rd day of November 1892.