Improvements in Machinery for Dressing, Facing, Outting, or Shaping Stone, Marble, Granite, and the like.
Year: 1892

page_text: Date of Application, 14th Apr., 1892-Accepted, 4th June, 1892
COMPLETE SPECIFICATION.
Improvements in Machinery for Dressing, Facing, Outting, or
Shaping Stone, Marble, Granite, and the like.
I, WILLIAM HENRY COULTER, of Bankfoot Foundry, Batley, Yorkshire,
Machine Maker, 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 first part of this invention has reference to prior Letters Patent granted to
James Coulter and Herbert Harpin, dated February 8th, 1877 No. 548, which
invention related to the rocking table employed in such machinery.
According to that invention the stone or other mineral to be operated upon is
fixed upon the rocking table between a vice or pair of jaws, one of such jaws being
adjustable to suit the varying lengths of stones under operation. The moveable
jaw is forced against the stone by means of a screw passing through a nut called
the vice nut. The nut passes between "stops or recesses formed in an opening
within the rocking table, and in practice it is found that the stops break or become
worn or damaged by usage, necessitating the expense of a new rocking table.
"
To overcome this, I employ a steel rectangular box provided with the necessary
"stops," such box being inserted in a recess or opening within the rocking table.
If, therefore, the stops get destroyed, the steel box can be removed and another one
inserted in its place, thereby avoiding the expense and trouble of obtaining an
entirely new rocking table. The vice, and also the nut, are held in position by
cotters passing underneath the rocking table.
The rocking table is also improved in respect to its centre or fulcrum. In the
old machine the fulcrum of the rocking table was below the heavier portion of the
table, and when the stone was fixed upon the table the weight was considerably out
of centre of fulcrum which made it difficult to overturn the table in consequence
of the leverage or preponderance of weight when overbalancing the table. To
overcome this objection I make the top of the table about lineable with the centre
of the fulcrum, whereby the table is more evenly balanced and occupies less room.
I further improve the rocking table by forming annular grooves in the side brackets
instead of bolt holes as hitherto, for the purpose of adjusting the table, by which
means I can adjust it at any required position or angle which could not be done
when bolt holes were employed, as in that case the adjustment could only be effected
from one bolt hole to the next succeeding one.
In order that this part of my invention may be better understood I will make
reference to the accompanying sheet of drawings wherein
Fig. 1 is elevation of my improved rocking table and
Fig. 2 plan view of a portion of the said table, whilst
Fig. 3 is a cross section through the table.
The line A represents the top of the machine table which is made to traverse
backwards and forwards after the manner of an iron planing machine. Upon each
side of the table are fixed pedestals or brackets B for receiving the journals or
axles C of the rocking table D in one end of which is an aperture or opening in
which opening is inserted my new steel nut box E. Various means may be
employed for making the nut box secure in the aperture of the table, and I do not
limit myself to any one particular method, but I find a convenient one to consist of
chipping bits or facings formed on the inner sides of the aperture whilst a cotter F
may be driven in at the end of the said steel box to bind it tightly in the opening.
This steel nut box is made with stops or projections a leaving recesses b into any
one of which recesses, I place the shank Ġ of the nut G¹ The shank H of the
moveable vice H' is not inserted into a recess or between stops as is the case with

page_text: the shank of the nut, but it is placed in the longitudinal opening I of the box Eso
that the said vice may be slided and bound tightly against the stone J by means of
the screw K which is turned by a suitable form of key. The jaw or vice L at the
right hand end of the table is inserted into a slot such as M and it is between the
vice H' and L that the stone is held in position. The shanks of the vices and of
the nut Gare made secure by cotters N. The journal C of the table is provided
with a worm wheel O in gear with a worm P so that when it is required to overturn
the table, to present a fresh side to the cutting tools, the worm is operated by the
handle or swape. The table is made secure to the fixed bracket B by means of
bolts and nuts and in order to adjust the table to any required angle or position,
I form in the inner face of the brackets B an annular groove for the reception
of the heads of the bolts c whereby the table can be fixed in any position required.
The second part of my invention has reference to the crosshead which has
hitherto carried and supported one or two tool boxes on one screw, but according to
my invention propose to arrange the crosshead so that it will carry two tool
boxes capable of operating upon separate parts of one stone or on two different
stones and also so arranging the said tool boxes that they may work together or
separately.
-
This part of my invention is illustrated on Sheets 2 and 3 wherein
Fig. 4 is front elevation and Fig. 5 end elevation of a crosshead with two tool
boxes.
A represents the crosshead provided with two downwardly projecting arms B
having journals C upon which the crosshead oscillates as is well known in this
class of machine. D and E represent the tool boxes carrying the cutting tools or
chisels F made secure in the crosshead by cotters G. Each tool box is made with
a nut H through which passes a horizontal screw I for the purpose of adjusting the
tools horizontally to suit the position of the stone fixed upon the traversing table.
The screws are operated in either direction by the train of gearing J. The spur
wheels L on the end of the screws I are bound and made secure upon the conical
shaped boss as shewn in Fig. 4 which is done by the nut M but in Fig. 6 the spur
wheel L is made secure by a conical bush N forced in position by the nut O. When
either of the tool boxes are not required to be in use, the spur wheel L on the end
of the screw is loosened by slackening nuts M and O. It will be obvious from the
drawings that the tool boxes can be brought nearer together or further apart to
suit the exact position of the stone upon the travelling table.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what
I claim is :-
Firstly. In a rocking table of a stone dressing machine, the use and combination
therewith of a moveable steel or other metal nut box E employed for the purpose
and in the manner substantially as herein shewn and described.
Secondly. In a rocking table of a stone dressing machine, the arrangement of
the axis C to be about lineable with the top of the said table for purposes and in
manner described.
Thirdly. In a rocking table of a stone dressing machine, in the use of annular
groove or grooves for receiving bolt heads, whereby the table can be adjusted to
any required position substantially as required.
Fourthly. In a stone dressing machine, the combination of two tool boxes driven
by separate screws with one crosshead operated in the manner and for the purpose
substantially as herein shewn and described.
DL: 10th J CA 1000
TASKER & CROSSLEY,
Halifax, Agents..