Improvements in Machines for Grinding and Polishing Stone.
Year: 1889

page_text: Date of Application, 24th June, 1889
Complete Specification Left, 13th Mar., 1890-Accepted, 19th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Machines for Grinding and Polishing Stone.
We, JOHN MENERNEY, Stone Polisher and WILLIAM HENRY DEMOREST, Hotel
Keeper, both of 25, Catherine Slip, in the City, County, and State of New York,
United States of America, do hereby declare the nature of this invention to be as
follows:-
Our Invention relates to machines for grinding and polishing stone.
The Invention relates more particularly to the grinding discs of which any suitable
In
number may be employed according to the size of the stone to be operated on.
the case of a pair of discs, they would be mounted horizontally side by side, so as to
leave a small space between their adjacent peripheries, on vertical shafts the lower
ends of which are stepped in bearings and which are supported in a T-shaped stand.
Each grinding disc is mounted upon, and secured to, the upper side of a smaller disc
so that the upper surface of the two shall be uniform. The under side of each lower
or supporting disc is provided with a boss having a socket on its under side and the
upper end of each shaft is rigidly seated in one of the sockets. Each grinding disc
consists of a series of segmental plates which are firmly held by bolts to the lower
disc.
The head of each bolt is embedded in a grinding plate the upper side of each
plate being countersunk for the reception of the bolt, the countersunk part then being
filled flush with the surface with lead or other suitable material. The side edges of
said plates are bevelled and when in place one edge of one plate overlaps but does not
touch the juxtaposed edge of the adjacent plate, thus leaving an inclined opening
between them. The inner ends of said plates are given a concave contour so that
when assembled a circular recess is formed at the centre of the discs, the floor of said
recess being the upper face of the supporting disc.
The operation is as follows; Power is imparted from a driving shaft to the vertical
shafts through the medium of pulleys and belts and the grinding discs and connected
parts are rotated, the discs being operated in unison while the granite or stone to be
ground or polished is carried back and forth over the upper surfaces of the grinding
discs by any suitable means. The sand or chilled iron that is used for grinding, finds
its way into the spaces between the plates of the upper disc until said spaces become
filled. The grinding action then carries and distributes the substance from one space
to another in a manner so as not to produce a perceptible accumulation on the upper
faces of the grinding discs, and at the same time permit a sufficient quantity of the
material on said faces to effect the desired results. The discs move in the same direction,
so as to produce but little wear on the joints of the lapped plates.
The object in cutting away the central part of the grinding plates is to retain only
those portions which have a comparatively rapid movement so as to prevent as nearly
as practicable a slow movement on one part of the stone and a more rapid movement
on another part.
Dated this 94th day of June 1889

page_text: COMPLETE SPECIFICATION.
Improvements in. Machines for Grinding and Polishing Stone.
We, JOHN MCENERNEY,. of. 25 Catherine Slip, in the City of New York, in the
County of New York, and State of New York, in the United States of America,
Stone Polisher, and WILLIAM HENRY DEMOREST; of the same place, Hotel Keeper,
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 machines for grinding and polishing stone, particularly to
the grinding-disks thereof; and it consists in a grinding-disk.constructed as herein-
after particularly described and claimed.
Reference is to be had to the accompanying drawings, forming a part of this
specification, in which similar letters of reference indicate corresponding parts in
both the figures.
Figure 1, is a partial plan view of a stone grinding and polishing machine
having my invention applied, and Figure 2, is a side elevation of the same, partly
in section.
A, B, represent two disks horizontally mounted, side by side, so as to leave a
small space between their adjacent peripheries, the upper faces of said disks
being of uniform height. C, D, are two, aligning, vertical shafts, the lower ends
of which are stepped in bearings C₁, D', respectively, and each shaft is provided
with a pulley E. F, F, represent a T-shaped stand, each end of the horizontal
part thereof being provided with an opening, in which freely turns one of the
vertical shafts aforesaid.
Each grinding-disk is mounted upon and secured to the upper side of a smaller
disk G. The under side of each disk G is provided with a boss.g, having a socket g
on its under side. The upper end of each vertical shaft is rigidly seated in one of the
sockets g². Each grinding-disk consists of a series of segmental plates e, eight plates
being shown in the drawings. These plates are firmly held by bolts H to the lower
disk G. The head of each bolt is embedded in a grinding-plate, the upper side of.
cach plate being countersunk for the reception of the bolt, the countersunk part. then
being filled flush with the surface with lead or other suitable material. The side
edges of said plates are beveled, and when in place on the disk G one edge of one
plate overlaps but does not touch the juxtaposed edge of the adjacent plate, thus
leaving an inclined opening between them, as best. shown at the upper left hand.in.
Figure 2 of the drawings. The inner ends of. said plates are given a concave contour,
so that when assembled upon. the disk G a circular recess. J is formed. at. the centre
of the disks A, B, as shown in Figure 1 of the drawings, the floor. of said recess
being the upper face. of the disk G, as shown at the upper right hand in. Figure 2. of
the drawings.
K, represents a driving-shaft provided with loose and fixed: pulleys K', K*,,and two
driving-pulleys L, L'.
M, M, represent belts which connect the driving-pulleys with the pulleya. an. the
vertical shafts.
The operation is as follows: Power is imparted to the driving-shaft by any suitable
means. Said shaft in turn imparts power to the vertical shafts through the medium
of the pulleys-and belts, as shown. The rotary motion of the vertical shafts rotates
the grinding-disks and connected parts, the disks being operated in unison. The
granite or stone to be ground or polished is carried back and forth over the upper
surfaces of the grinding-disks by any suitable means. In practice a crane is preferably
employed for carrying the stone. The sand or chilled iron that is used for grinding
finds its way into the spaces between the plates of the upper disk until said spaces
become filled. The grinding action then carries and distributes the substance from
one space to another in a manner so as not to produce a perceptible' accumulation on
the upper faces of the grinding-disks, and at the same time permit a sufficient quantity
L

page_text: of the material on said faces to effect the desired results. The disks move in the
direction of the arrows, so as to produce but little wear on the joints of the lapped
plates.
.
The object in cutting away the central part of the grinding-plates is to retain only
those portions which have a comparatively rapid movement, so as to prevent as nearly
as practicable a slow movement on one part of the stone and a more rapid movement
on another part.
Although we have shown and described but two rotary disks, more than two may
be employed when desired for larger stone.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
1. In a machine for grinding and polishing stone, a grinding-disk consisting of a
series of spaced segmental plates having beveled side edges, substantially as shown
and described.
2. In a machine for grinding and polishing stone, a grinding-disk consisting of a
series of segmental plates having beveled side edges, one edge of one plate overlapping
but not touching the juxtaposed edge of the adjacent plate, substantially as shown and
described.
3. In a machine for grinding and polishing stone, the combination, with two
aligning vertical shafts mounted to turn in suitable bearings, and each provided
with a belt-pulley, and disks rigidly mounted upon the upper ends of said shafts,
of grinding-disks fixed to said rigidly mounted disks, and consisting of a series
of segmental plates having beveled side edges, one edge of one plate overlapping but
not touching the juxtaposed edge of the adjacent plate, and means for rotating said
shafts and disks, substantially as shown and described.
Dated this 25th day of February 1890.
JOHN M'ENERNEY.
WILLIAM HENRY DEMOREST.