IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GRINDING POLISHING OR FACING, STONE, GLASS, SLATE OR SUBSTANCES OTHER
Year: 1883

page_text: LETTERS PATENT to George Coates of Holmes shed Rawtenstall and Alfred
Coates of Love Clough near Rawtenstall both in the County of Lancaster
Engineers for an Invention of IMPROVEMENTS IN MACHINERY OR APPARATUS
FOR GRINDING POLISHING OR FACING, STONE, GLASS, SLATE OR
SUBSTANCES
OTHER
PROVISIONAL SPECIFICATION left by the said George Coates and Alfred
Coates at the Office of the Commissioners of Patents on the 25th January
1883.
GEORGE COATES of Holmes shed Rawtenstall and ALFRED COATES of Love
Clough near Rawtenstall both in the County of Lancaster Engineers " IMPROVE-
MENTS IN MACHINERY OR APPARATUS FOR GRINDING, POLISHING, OR FACING
STONE, GLASS, SLATE OR OTHER SUBSTANCES.”
The object of our invention is to economise time and to produce a truer surface
than by the methods at present in use.
In performing our Invention we make use of the ordinary bottom bed which is
laid with stones or other substances which are to be treated and an upright shaft or
spindle to which a revolving motion is given by gearing or in any convenient
manner. On this shaft and above the bottom bed we fix a key or frame with one
or more arms radiating from the centre: near the ends of these arms are vertical
shafts or studs to which at the bottom end are attached the frame or frames or
cramps or grapnels that carry the stone or other substances which compose the top
layer or bed.
The operation of the machine is as follows:-Motion is given to the upright
shaft and transferred from it to the fixings at the ends of the radial arm, (through
which the vertical studs or shafts slide on a feather key, or such studs may be
square or of other section when no key is required) by means of spur gearing,

page_text: worms and worm wheels or in any convenient manner.
The frames which carry
the top stones thus revolve upon or round the main upright shaft and simul-
taneously upon their axes at the ends of the radial arms thus describing a sun and
planet motion.
The studs to which the frames or cramps or grapnels are secured may be
supported eccentrically in the bearings at the ends of the arms, and when such
eccentrics are used an additional movement to and from the centre is given to the
frames with the top stones.
The top frames and substances may be carried round or revolved by the friction
of the substance to be ground on the lower bed instead of by gearing.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Coates and Alfred Coates in the Great Seal Patent Office
on the 25th July 1883.
GEORGE COATES, of Holmes-Shed, Rawtenstall and ALFRED COATES, of Love
Clough, near Rawtenstall, both in the County of Lancaster Engineers, " IMPROVE-
MENTS IN MACHINERY OR APPARATUS FOR GRINDING, POLISHING, OR FACING
STONE, GLASS, SLATE OR OTHER SUBSTANCES
"
The object of our Invention is to economise time and to produce a truer surface
than by the methods at present in use.
In performing our Invention we make use of the ordinary bottom bed which is
laid with stones or other substances which are to be treated and an upright shaft
or spindle to which a revolving motion is given by gearing or in any convenient
manner, On this shaft and above the bottom bed we fix or key a frame with one
or more arms radiating from the centre: near the ends of these arms are vertical
shafts or studs to which at the bottom end are attached the frame or frames or
cramps or grapnels that carry the stone or other substances which compose the top
layer or bed.
The operation of the machine is as follows:-Motion is given to the upright
shaft and transferred from it to the fixings at the ends of the radial arm (through
which the vertical studs or shafts slide on a feather key or such studs may be
square or of other section when no key is required) by means of spur gearing
worms and worm wheels or in any convenient manner. The frames which carry
the top stones thus revolve upon or round the main upright shaft and simul-
taneously upon their axes at the ends of the radial arms thus describing a sun and
planet motion.
The studs to which the frames or cramps or grapnels are secured may be
supported eccentrically in the bearings at the ends of the arms and when such
eccentrics are used an additional movement to and from the centre is given to the
frames with the top stones.
The top frames and substances may be carried round or revolved by the friction
of the substance to be ground on the lower bed instead of by gearing.
Aud in order that our Invention may be fully understood and readily carried
into effect we will proceed to describe the accompanying two Sheets of Drawings
reference being had to the figures and letters marked thereon.
Fig. 1 is a plan and Fig. 2 an elevation partly in section of a machine for
grinding, polishing or facing stone or other substances constructed according to our
Invention.
a is the ordinary bottom bed which is laid with stones b or other substances
which are to be treated and c is the upright shaft or spindle to which a revolving
motion is given by gearing c¹ or in any other convenient manner. The shaft c is
beld in a stationary bearing c² and supported at the bottom in a footstep c³: on
this shaft and above the bottom bed a we fix or key a frame with one or more
arms d (three are shown in the drawing) radiating from the centre: vertical studs
or shafts e are fitted in bushes f grooved on their outer circumference and held or
supported in corresponding bearings near the ends of the radial arms d. The spur
wheels e to which the frames, cramps or grapnels g are secured are made with or
keyed to the studs e and are formed with lugs or projections to which are secured
the cramps g which drag around the stones h or other substances which compose
the top layer or bed. The spur wheels e' gear with a spur wheel i secured to the
stationary bearing c and made of sufficient depth to allow for the adjustment of
the studs e, spur wheels el, cramps g and top substances h. The studs c may slide

page_text: on a feather key or may be made square or of other section when no key is
required but we prefer to secure them in the bushes which have grooves fl on
their outer circumference. Washers e² and eye bolts are secured to the studs e'
and in this manner the studs e, spur wheels e¹ and cramps g are all suspended from
the stationary bush f: or if preferred the whole weight of these parts may rest on
the top layer of substances h. One or more collars d' are made in each bearing at
the ends of the radial arms d and fit into the grooves f': caps d² hinged at d³ form
part of the bearings for the bush fand are made to open when required.
By opening the hinged caps d² and suspending the studs e on a crane by means
of the eye bolts e³, the studs e, spur wheels e¹ bushes f and cramps g can all be
raised or lowered and retained in position by the collars d¹ and grooves fl and so
adjusted in height to suit different thicknesses of substances on the bottom bed a.
When motion is given to the upright shaft c by means of the gearing c¹, the
radial arms d revolve and carry the cramps g and thus drag around the upper layer
of substances h.
The spur wheel i being secured to the stationary bearing c² of the shaft d does
not revolve and consequently causes the spur wheels e¹ which gear into it and to
which the cramps g are attached to revolve on their own axes when the radial
arms dare revolving with the shaft c thus the cramps g with the top layer of
substances h describe a sun and planet motion.
If the studs e and spur wheels e' were secured to the cramps g eccentrically
instead of concentrically as shown in the drawings, a scouring or to and fro motion
would be imparted to the cramps g and thus to the top layer of substances / in
addition to the sun and planet motion previously described.
The cramps g and substances h may be carried round or revolved by the friction
of the substances b to be ground on the lower bed a instead of by gearing.
Having stated the nature of our Invention and described the manner of
performing the same
We declare that we claim
1. The combination or arrangement of parts forming the improved machinery or
apparatus for grinding, polishing or facing stone, glass, slate or other substances,
substantially as herein shown and described.
2. In a machine for grinding, polishing, or facing stone glass slate or other
substances imparting a sun and planet motion to the top layer of substances either
with or without a scouring or to and fro' motion substantially in the manner
herein shown and described.
In witness whereof I the said George Coates for myself and on behalf of the
said Alfred Coates have hereunto set uy hand and seal this twenty fourth day of
July One thousand eight hundred and eighty three.
GEORGE COATES (L.S.)