An Improved Means for Grinding or Abrading Marble, Stone, and the like.
Year: 1894

page_text: Date of Application, 2nd Apr., 1894
Complete Specification Left, 29th Dec., 1894-Accepted, 30th Mar., 1895
PROVISIONAL SPECIFICATION.
An Improved Means for Grinding or Abrading Marble, Stone, and
the like.
I, FRANK SALES RECHTSTEINER of Brown Street, Dayton, Ohio, United
States of America, Monumental Dealer, do hereby declare the nature of this
invention to be as follows:-
This invention has for object to grind marble, stone and the like to any desirable
diameter and to a concave, convex or serpentine surface. For this purpose the
marble or stone is placed in a lathe so as to rotate in a trough supplied with an
abrasive material such as crushed steel coarse grained to commence with and
afterwards fine grained crushed steel or emery or sandstone, etcetera.
The trough
is carried in a carriage that may be slid along, and transversely to, the lathe bed
and may be moved from side to side by means of a pivotted hand lever. The
trough may be adjusted vertically in the carriage by means of one or more screws
and nuts. The upper part of the carriage carries a grinding plate adjustable
relatively to the object to be ground by means of screws.
In addition to the
abrasive material water is supplied to the trough. The trough may be constructed
with longitudinal ribs.
Dated this 2nd day of April 1894.
THOMAS R. SHILLITO,
89, Chancery Lane, London, W.C., Agent for the Inventor.
An Improved Means for Grinding or Abrading Marble, Stone, and
the like.
I, FRANK SALES RECHTSTEINER of Brown Street, Dayton, Ohio, United
States of America, Monumental Dealer, 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 has for object to provide means for grinding marble, stone and
the like to any desirable diameter and to a concave or convex surface.
In the drawing
Fig. 1 is an end view of a lathe with the attachment or device of this
invention.
Figs. 2 and 3 are end views of columns of marble or stone previous to being
operated upon.
Figs. 4, 5 and 6 are ends views of different forms of the attachment.
Fig. 7 is a side view of a lathe with the attachment applied thereto.
Fig. 8 a part sectional plan of the under framing.
B¹ the
Fig. 9 an end view of the attachment for grinding hollow or concave surfaces.
A is the lathe provided with a chuck B having two or more prongs b.
C a plate having a central recess for the back centre to take into
and provided also with two or more prongs e. Da column of marble, the dotted
back centre.
Price 871

page_text: lines (Fig. 1) shewing a column made up of four sections. D', D₁, (Figs. 2, 3) are
solid columns. d cavities for the reception of prongs 6 or c to hold the column
when rotated in the lathe. E head stock. E tail stock. e driving pulley. F an
adjustable trough of any suitable length and shape as F', F", F, in Figs. 4, 5, 6.
This trough may be constructed of any material of sufficient strength and hardness,
or it may be constructed of a series of steel ribs f (Fig. 5) embedded in iron at any
suitable distance apart. I prefer the use of chilled iron or steel in this construction.
G is the trough support. a guide strip or feather for the trough. H a screw for
raising and lowering the trough. Ha screwed locking lever which tightens
against the support G and holds screw H locked. J is a hand lever which when
laterally reciprocated, shifts through rods, the support, and consequently the
trough to the right and left an operation which prevents slush forming in ridges
round the rotating column. K is a plate on which is pivotted at the lever J.
M (Fig. 1) is a longitudinal grinding plate of any metal having sufficient strength
and durability and of a length corresponding to the trough and adjustable by means
of two or more screws N relatively to the rotating column. O is an inclined
extension of the trough support. P represents a quantity of slush in lodgement in,
around and between the trough F and the marble or stone column D. This slush
is formed by particles of crushed steel or any other abrasive material commingled
with water, and the dust or grindings of the marble when the same is being rotated
in the trough centred between the chuck and back centre of a lathe, the said slush
constantly and symmetrically reducing by abrasion the column until the sinallest
diameter desirable is obtained. I prefer crushed steels in various degrees of fineness
as the abrasive material to be used in a trough coming in frictional contact with a
rotated column of stone, marble or like material but do not confine myself to
crushed steel alone as other abrasive materials may be employed both for grinding
and polishing, a high degree of polish being attained by the use of pumice stone.
By sharply reciprocating the trough F spiral, chased or serpentine lines may be
formed upon the column under treatment of greater or less smoothness according to
the nature of the grinding material. By slowly reciprocating the trough a smooth
surface is obtained.
In Fig. 9 a block R roughly hewn to a concave surface is shewn held upon a
carriage P, supporting clamping plates P adjustably secured thereon by screws S,
the ends of the carriage being supported on adjusting screws S¹ carried upon a bed
plate T which moves upon guides of the lathe bed A A trough y resting upon
the block R to be ground holds the grinding material and a revolving cylinder Q
carried between the centres of the lathe together with the abrading material or
slush grinds out a concave surface in the block R.
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. In an attachment to lathes for the purpose referred to, a trough having
removable extension, consisting of a longitudinal plate attached thereto, in
combination with supporting pieces having adjusting screws and a lever whereby
the trough may be moved backward and forward in a longitudinal direction,
substantially as described and shewn.
2. An attachinent for lathes consisting of a trough adapted to hold an abrasive
substance and to be adjusted both vertically and laterally beneath a rotated column
of stone secured between the centres of a lathe, substantially as described and
shewn.
3. The trough F provided with the extension O and the adjustable grinding
plate M said trough being adapted to hold a loose abrading material and to be
adjustable vertically and laterally, substantially as described and shewn.
4. The combination with the table or support G, of a trough provided with
longitudinal ribs f and adapted to hold a loose abrading material that may be kept
in close proximity to a rotating column of stone or the like by means for adjusting