Year: 1887

page_text: Date of Application, 12th Dec., 1887
Complete Specification Left, 11th Sept., 1888
Complete Specification Accepted, 2nd Nov., 1888
1, CHARLES EMMET of 9, Highfield Terrace, Beeston Hill, Leeds, in the County of
York, Engineer, do hereby declare the nature of this invention to be as follows :-
To provide a machine, for grinding away the Gaits formed on the stoppers, in the
pressing process, and to effect this Grinding in such a manner, that the surface
operated upon, shall be ground spherically. With this object in view-I mount a
shaft in Bearings, and on this shaft I arrange a number of Emery Wheels. Above,
and at a suitable distance from the Emery Wheel, is fixed a Guide, for the reception
of the stoppers, during the Grinding process. I also provide Handles, to one end of
which, the stoppers can readily be attached, and which securely hold the stopper in
position, by means of a cup shaped recess formed of Rubber or Leather, or the
cupped recess may be made in two parts, and closed on the stopper by a spring,
along the central line of the Handle, a hole is formed for the reception of a rod,
which will eject the marble when ground. Means are also provided by which the
stoppers, on being fixed in the Handles shall have their Gait ends pointing in a
direction central with the Handles. A slowly revolving Shaft, carrying an Arm that
engages with the opposite end of the Handle than that to which the stopper is
attached, imparts to the handle a rotatory movement. A slide carried by the revolving
arm, and capable of traversing from the outer end to the centre of the arm, and vice
versa, will cause the end of the Handle to describe a Scroll like movement.
The Grinding operation is effected in the following manner. The attendant having
secured a stopper to the Handle, places the stopper in the Guide fixed above the
revolving Emery Wheel, the Gait end of the stopper projects through a hole in the
Guide, and in contact with the Emery Wheel. The Handles being weighted by
springs or weights, will feed the stopper to the Emery Wheel, as the Grinding is
effected, untill further Grinding is provented by reason of the stopper resting on a
seating formed in the Guide.
It will thus be seen, that by reason of the movement given to the loaded Handle
combined with the fixed Rest which keeps the stopper at a proper distance from the

page_text: Emery Wheel, will result in removing the Gait, and will leave the surface operated
upon truly spherical.
The marble rest or Guide is capable of adjustment, to allow for wear of the Emery
Wheel.
Or I may arrange an Emery Wheel to work horizontally, and at suitable distances
around its circumference are placed the marble Handles, which in this case will be
horizontal also. The wheel revolves in an open topped casing containing water.
Another arrangement consists in employing an Emery Wheel revolving under Water
and Horizontally. The stopper Handles and Guides being placed upon its upper
surface.
A reciprocating movement is given to the Emery Wheels that grind upon their
circumferential surface, and in the case of the Wheel, grinding upon its upper surface,
movement can be given to the stopper Handles, with the object of ensuring equal
wear, and preventing the Wheel being worn into groves.
The stopper handles may be dispensed with, and the stopper moved by hand in
the fixed guide or Rest. The whole surface of the stopper may be operated upon,
if after the stopper has had its Gait ground away, it is placed in a Guide similar to
the one described, and motion imparted to the stopper.
Dated this 10th day of December 1887.

page_text: I CHARLES EMMET of 194, Doncaster Road, Barnsley, in the County of York (and
late of 9, Highfield Terrace, Beeston Hill, Leeds, in the said County) Mechanical
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 :-
The object of this Invention is to provide a machine for grinding away the gaits
formed on the stopper in the pressing process, and to effect this grinding in such a
manner that the surface operated upon shall be ground spherically. With this object
in view I mount a shaft in bearings, and on this shaft I arrange a number of emery
wheels. Above and at a suitable distance from the emery wheel is fixed a guide for
the reception of the stoppers during the grinding process. I also provide handles, to
one end of which the stoppers can be readily attached and which securely hold the
stopper in position by means of a cup-shaped recess formed of rubber or leather, or
the cupped recess may be made in two parts and closed on the stopper by a spring.
Along the central line of the handle a hole is formed for the reception of a rod, which
will eject the marble when ground. Fixed above the emery wheel a slowly revolving
shaft (carrying an arm that engages with the opposite end of the handle to that to
which the stopper is attached) imparts to the handle a rotatory movement. A slide
carried by the revolving arm and capable of traversing from the outer end to the
centre of the arm and nice versa, will cause the end of the handle to describe a scroll-
like movement.
The grinding operation is effected in the following manner: The attendant, having
secured a stopper to the handle, places the stopper in the guide fixed above the
revolving emery wheel. The gait end of the stopper projects through a hole in the
guide and in contact with the emery wheel. The handles being weighted by springs
or weights will feed the stopper to the emery wheel as the grinding is effected, until
further grinding is prevented by reason of the stopper resting on a seating formed
in the guide. It will thus be seen that by reason of the movement given to the
loaded handle combined with the fixed rest which keeps the stopper at a proper
distance from the emery wheel, the gait will be removed and will leave the surface
operated upon truly spherical. The marble rest or guide is capable of adjustment to
allow for wear of the emery wheel; or I may arrange an emery wheel to work
horizontally, and at suitable distances around its circumference are placed the marble
handles which in this case will be horizontal also. The wheel revolves in an open
topped casing containing water. Another arrangement consists in employing an
emery wheel revolving under water and horizontally, the stopper handles and guides
being placed upon its upper surface.
A reciprocating movement is given to the emery wheels that grind upon their
circumferential surface, and in the case of the wheel grinding upon its upper surface
movement can be given to the stopper handles with the object of ensuring equal wear
and preventing the wheel being worn into grooves.
Referring to the drawings, Fig. 1 is an elevation partly in section. Fig. 2 is a side
elevation. Fig. 3 is a plan of cam wheel and bowl. Fig. 4 is a sectional and Fig. 5
an external view of marble holder. Fig. 6 shows in plan the frame carrying the
marble rests.
In Fig. 1 a is the annular grinding wheel driven by wheels b, c.
enclosed in a casing d; a frame e (Fig. 6) is carried by casing d, and
The wheel is
in this frame

page_text: the guides for the reception of the marbles are seated eccentrically with the centre
of the grinding wheel, so that the whole surface of the wheel may do an equal share
of work. The girder carries the two shafts hh, worm wheels ii, and slides jj;
kare carriages sliding on slides jj; 1 are fixed cams one of which is shown in
plan in Fig. 3; m m are bowls carried by studs n n, the studs being secured to the
sliding carriages kk; oo are spiral springs for the purpose of keeping the bowls m m
in contact with the exterior diameter of fixed cams 11; p is a frame somewhat similar
in profile to the one shown in Fig. 6.
Fig. 4 shows one of the marble holders in section, 9 being the stem provided with
jaws of suitable form for the reception of the marble; is a retaining ring closing
the jaws and holding the marble in position; ss is a piston armed with a cupped
head projection t; is a spiral spring, and a stop controlling the movement of the
piston s s. Fig. 4 also shows one of the marble guides threaded for insertion in the
frame ; the guides are furnished with wearing plates w formed with central hole a,
through which that portion of the marble containing the gait projects; y is the
surface of a portion of the annular grinding wheel. The attachment of the sliding
carriages to the frame p is effected by means of the return cranks z z and
studs 1. 1.
The action of the machine is as follows:-The movement given to the upper
frame p by means of fixed cam wheels, bowls m m, carriages kk, & worm wheels i i
will resemble in figure the contour of the fixed cam wheels and will impart to the
upper end of the marble holders a similar movement. The lower end of the holder
containing the marble to be ground being placed in the marble guide f and seated on
the wearing plate we will also partake of the above-mentioned movement, the fixed
cams being formed with three four or any convenient number of projections on their
circumferential edge. It follows that the movement of the holders will be (if the
fixed cam wheels have four projections) for one quarter of a revolution of the
bowls m m around the fixed cams, the holders will travel following a spiral track
from the vertical to the extrenie angular one, as shown by Fig. 1 at 2, 2; the quarter
revolution being accomplished the holders again assume the vertical position, having
attained which the former process is repeated and so on till the entire revolution
is effected.
It will thus be seen that as the marbles are supported on the wearing plates at the
proper distance from the grinding surface, the movement imparted to the holders will
result in that portion of the marble operated upon being ground truly spherical.
Provision is made by footstep 3 for raising the grinding wheel as wear takes place.
The marble holders may be arranged around the circumference of disc wheels
revolving vertically or horizontally, the marble rests, marble holders, and the means
for imparting movement to the marble holders remaining the same.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The marble rest, marble holders, annular grinding wheel, and the means for
imparting movement to the marble holders, substantially as described and illustrated,
or any mechanical equivalents therefor.
2. Grinding on the exterior diameter of disc wheels revolving vertically or
horizontally.
3. The arrangement and construction of the various parts substantially as described
and illustrated and any mere modifications thereof.
Dated this 10th day of September 1888.
CHARLES EMMET.