Improvements in Apparatus for Dressing Stone.
Year: 1892

page_text: Date of Application, 28th Mar., 1892
Complete Specification Left, 28th Dec., 1892-Accepted, 18th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Dressing Stone.
1, ALBERT TAYLOR of Town Gate, Hipperholme in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to apparatus for dressing stone, such as door steps, window
heads stair landings and the like.
Such apparatus according to this invention comprises two sets of planing tools,
arranged opposite each other and between which the stone to be dressed is placed.
The planing tools are carried in heavy sliding holders and are caused to advance
and recede from each other by means of eccentrics cams or equivalent mechanism.
The tools of one set come opposite the spaces between those of the opposite set.
Each set of tools strikes the stone at the same time and travels from the edge
inwards cutting a little beyond the middle of the face to be dressed. By this means
the edges of the stone are not snapped off as would be the case if one set of tools
were employed travelling the whole width of the face.
The stone to be dressed is carried by a girder frame provided with adjustable
clamping screws whereby it is clamped centrally between the planing tools.
Suitable means, such as a toothed rack and pinion, operated by a ratchet wheel
and pawl, or screw gearing is or may be employed for feeding or imparting an
intermittent motion to the stone. The stone may also conveniently be supported
and carried on suitable trucks guided on rails that may be varied in height to suit
the size of stone to be treated. The rails for the trucks may for this purpose be
supported on cross beams the ends of which are provided with screw-threaded lugs
or fixed nuts into which take vertical screw-threaded spindles, provided with
suitable gear such as worm wheels for rotating them simultaneously.
The cutting mechanism is supported by base plates secured opposite each other
to the foundation, and if necessary tied or braced together. On each of the base
plates a heavy tool holder is caused to slide to and fro by means of rods connected
to suitable eccentrics or cams. The tool holder is constructed to carry two or.
more tools, say for example six, and is provided with arrangements for turning
each of the tools over a half revolution, when it has reached the end of its
backward stroke. The tools are held in tubular carriers each provided with a
pinion arranged so that the pinion of one engages with that of the next tool carrier.
The carriers are automatically turned by another wheel that gears with a ratchet
wheel driven by a pawl and connecting rod.
The tubular tool carrier near one end has a slotted hole formed therein into
which takes a cotter or cross piece that rests on the end of the cutting tool; the
cross piece and tool are set in position by screw nuts at the outer part of the
tubular tool-carrier. The cutting tool may thus be quickly taken out by removing
the cotter.
The eccentrics or cams are so set on the driving shaft that the tools in each of
the sliding tool holders advance towards each other simultaneously, each set
travelling as stated a little past the middle of the stone. The tools striking each
edge of the stone simultaneously in opposite directions have a tendency to retain
the stone centrally.
When one edge of the stone requires more removing than the other adjustable
holding up bars are provided for guiding the clamping frame.
Suitable driving gear and shafting is provided for rotating the eccentric or cam
shaft and the gearing for raising and lowering the guide rails.
'The clamping 'frame may consist of two 'girders 'having right and left hand

page_text: screwed spindles for moving them to grip the stone, and may be provided with a
toothed rack or other suitable gear for feeding the stone forward.
Dated this 28th day of March 1892.
ALBERT TAYLOR,
By L. W., per F. B.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Dressing Stone.
I, ALBERT TAYLOR of Town Gate, Hipperholme in the County of: York,
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 :-
This invention relates to apparatus for dressing stones such as door steps, window
heads, stair landings and the like.
Such apparatus according to this invention comprises two sets of planing tools,
arranged opposite each other and between which the stone to be dressed is placed.
The planing tools are carried in heavy sliding holders and are caused to advance
towards and recede from each other by means of eccentrics, cams or equivalent
mechanism.
The tools of one set come opposite spaces between those of the opposite set.
Each set of tools strikes the stone at the same time and travels from the edge
inwards cutting a little beyond the middle of the face to be dressed. By this means
the edges of the stone are not snapped off as would be the case if one set of tools
were employed travelling the whole width of the face.
The stone to be dressed is held in position by a girder frame provided with
adjustable clamping screws whereby it is clamped centrally between the planing
tools. Suitable means, such as a toothed rack and pinion, operated by a ratchet
wheel and pawl, or screw gearing is or may be employed for feeding or imparting
an intermittent lateral motion to the stone. The stone may conveniently be
supported and carried on suitable trucks guided on rails that may be varied in
height to suit the size of stone to be treated. The rails for the trucks may for this
purpose be supported on cross beams the ends of which are provided with screw-
threaded lugs or fixed nuts into which take vertical screw-threaded spindles,
provided with suitable gear such as worm wheels for rotating them simultaneously.
The cutting mechanism supported by base plates secured opposite each other
to the foundation, and if necessary tied or braced together. On each of the base
plates a heavy tool holder is caused to slide to and fro by means of rods and suitable
eccentrics or cams. The tool holders are each constructed to carry a number of tools,
and are provided with arrangements for turning each tool a half revolution, when
it has reached the end of its backward stroke. The tools are held in tubular carriers
each provided with a pinion arranged so that the pinion of one engages with that of
the next tool carrier. The carriers are automatically turned by a wheel driven by
means of a ratchet wheel, a pawl and connecting rod, or other suitable mechanism.
The tubular tool carrier has near one end a slotted hole formed therein into which
takes a cross piece that rests on the end of the cutting tool; the cross piece and
tool are set in position by screw nuts at the outer part of the tubular tool
carrier. The cutting tool may thus be quickly taken out by removing the cross
piece.
The eccentrics or cams are so set on the driving shaft that the tools in each of
the sliding tool holders advance towards each other simultaneously, each set
travelling, as above stated, a little past the middle of the stone. The tools striking
each edge of the stone simultaneously in opposite directions have a tendency to
retain the stone in a central position.
When more of one edge of the stone requires removing than the other adjustable
holding up bars are provided for guiding the clamping frame.

page_text: Suitable driving gear and shafting are provided for rotating the eccentric or cam
haft and the gearing for raising and lowering the guide rails.
The clamping frame may consist of two girders having right and left hand
screwed spindles for moving them to grip the stone, and may be provided with a
toothed rack or other suitable gear for feeding the stone forward.
The apparatus may be arranged entirely above ground, or partly above ground
and partly below.
Referring to the accompanying drawings which illustrate apparatus according to
this invention the mechanism for supporting the stone being shewn within a pit
or well;
13+
1
1
1
sake of clearness.
Fig. 2. a plan.
Fig. 3 a section on the line 11, 12, of Fig. 2.
Fig. 4. is a section on the line 13, 12 Fig. 2. drawn to a larger scale.
Fig. 5. is a plan partly in section shewing the tools at the end of their forward
stroke.
Fig. 6. is an end elevation partly in section.
Fig. 7. is a similar view shewing the gear for feeding or traversing the clamping
frame.
Fig. 8. is an inverted plan of the clamping frame.
Figs. 9. and 10. are detail views of a tubular tool carrier in elevation and section
respectively.
Similar letters refer to like parts throughout the drawings.
The stone A. to be dressed is placed midway between two sets of planing tools A'
and A'; it is firmly gripped by a clamping frame comprising girders B. B', they
are provided with two sets of right and left hand clamping screws B² B³ and a
steadying pin and socket arrangement B3 Figs. 2 and 8. The girders B. B' are
supported on angle iron bars B that extend to each end of the machine foundation
and are secured to fixings B as shewn in Figs. 1. 2 3 & 4. C is a rack secured to
the girder B. and about the same length, into it gears a shrouded pinion C¹ secured
to the shaft C which is intermittently rotated in any suitable manner and thus
causes the lateral movement of the frame and stone.
The arrangement which I prefer to employ for this purpose is illustrated in
Figs. 4, 6 & 7. Referring to these figures C is a weighted lever carrying_a
pawl C that takes into a ratchet wheel C secured to the shaft C*. A cam D.
mounted on the eccentric shaft. E, so arranged that each time the tool holders
assume the position shewn in Figs. 2, 3 and 4 it forces down the pivotted cross
lever D¹ one end of which is connected by a link D2 to the weighted lever C³ thus
turning the shaft C and with it the pinion C¹. The link D' is provided with
universal joints at its ends, so as to permit of the shaft C2 moving slightly in a
longitudinal direction together with the clamping girder B. and rack C to suit
stones of various thicknesses to be dressed.
The stone A. is supported according to its size on one or more trucks F. on
rails F F that are fixed upon cross beans F F which are provided with screw
threaded nuts or lugs at their ends in which vertical screw spindles G G work.
They are guided at their upper ends in the bearings G' and terminate in the
footstep fixings F³ as shewn in Figs. 3 and 4. The screw spindles & can when
desired be simultaneously rotated by means of worm wheels G' keyed to their
upper ends and worms Gs mounted on the two longitudinal shafts H H which are
driven by a train of toothed wheels H' from the driving shaft H³ which is rotated
in either direction by belts, passing round the pulleys H³.
The base plates J J¹ of the cutting mechanism are in the example illustrated
secured to the foundation of the apparatus and are tied together by stay bars K.
Figs. 2, 3 & 4. They are also provided with recesses into which take adjustable
holding up bars Land regulating tail screws L' for guiding and taking the strain
on the clamping frame girders B. or B when the tools A³ or A' have a heavier

page_text: cut to take than those on the opposite side of the stone to be dressed. They are
not intended to grip the clamping girders tightly but to act as centering holding
up bars through which the clamping frame slides between.
The tool holders M. M' are caused to slide in the base plates J. J alternately
advancing towards and receding from each other simultaneously by means of
rods N. N which are actuated by eccentrics P. keyed on a shaft E that is mounted
in bearings on a pedestal secured to the base plate J.
The shaft E. is driven from the driving shaft Q. upon which is fixed a strap
pulley by means of toothed wheels R indicated (Figs. 1 & 2). In the example
illustrated each tool holder is constructed to carry six tools which are held in
tubular carriers S (Figs. 4, 8 & 10) that take into the tool holders M. M: Each
carrier is provided with a pinion S¹; the pinions of adjacent carriers gearing with
each other.
For automatically and simultaneously turning each of the tools A' A² a toothed
wheel S gears with one of the pinions S¹; the toothed wheel S2 is rotated by a
pair of bevel wheels S³ actuated by a ratchet wheel S and pawl connected by a
tappet rod T. and tappets T' T' which catch against any suitable part of the
opposite tool holder such as the ratchet wheel shaft S as shewn in Figs. 2, 3 & 4
the arrangement being such that the tools after leaving the stone A. are rotated at
the end of the backward stroke, the pawl being moved into engagement with the
next tooth on the ratchet wheel S during the forward stroke.
By causing the tool to turn over the cutting point or edge is worn evenly on its
two sides thus it requires less sharpening than would be the case if it did
not turn.
The tubular tool carriers S. are slotted and into the slot holes S take cross
pieces or cross bars S7 that take the thrust of the tools. The cross bars are fixed
in position by nuts S8 screwed onto the carrier as shewn in Figs. 4, 9 & 10 a set
screw S prevents the cutting tools from dropping out. By releasing the set screw
and withdrawing the cross bar S' the tool can be quickly removed through the
upper end of the carrier S. The tools can be so adjusted that the first set of tools
roughs down the stone and the remaining ones finish off the same.
The eccentrics P. are so arranged on the shaft E. that the sets of tools A'
and A² commence to advance or to recede simultaneously, and the throw of the
eccentrics is such that the cutting points of the tools A' A slightly overlap at the
end of the advance stroke at about the middle of the face of the stone to be
dressed. The tools thus strike the stone in opposite directions at the same time
thus tending to retain the stone in its central position except when one set of tools
are required to take off more than the other, in which case the holding up bars L.
alone retain the clamping girders B. B' central.
It will thus be understood that I do not confine myself to the exact details shewn
in the drawings as they can be variously modified according to requirements.
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. Apparatus for dressing stones in which oppositely arranged sets of tools are
caused to alteruately advance towards and recede from each other by means of
eccentrics or the like, the tools of one set being arranged opposite spaces between
the tools of the other set so as to permit the points of the tools to overlap, and the
stone is maintained in such a position that the tools act upon the face of the stone
to be dressed substantially as described.
2. In apparatus for dressing stones of the kind referred to in Claim 1, a clamping
frame for holding the stone to be dressed in position between the tools,. said
clamping frame being guided and retained in position by adjustable holding up bars,
and being provided with means whereby it is intermittently moved for the purpose
of laterally feeding the stone substantially as described.
3. In apparatus for dressing stones a clamping frame of the kind referred to in

page_text: the preceding claim and adjustable means for supporting the stone comprising a
truck or trucks running on rails supported on cross beams provided with screw
threaded lugs or nuts in which work screw threaded spindles provided with means
for simultaneously rotating the same substantially as described.
4. In apparatus for dressing stone, tool holders provided with tubular tool
carriers so arranged and operated as to impart partial rotary movement to the tools
at each stroke thereof substantially as described.
5. In apparatus for dressing stones tool holders having rotatable slotted tubular
tool carriers, provided with nuts and cross pieces whereby the tools can be adjusted,
substantially as described.
6. The hereinbefore described apparatus for dressing stones constructed
arranged and operating substantially as described and shewn in the drawings
annexed.
Dated this 28th day of December 1892
ALBERT TAYLOR,
By L. W., per F. B.