Improvements in Machines for Grinding, Bevelling, and Polishing Glass Plates and the like.
Year: 1896

page_text: Date of Application, 21st Dec., 1896-Accepted, 23rd Jan., 1897
COMPLETE SPECIFICATION.
Improvements in Machines for Grinding, Bevelling, and Polishing
Glass Plates and the like.
We HENRY BRECKNELL, Engineer, and EDWARD MAY MUNRO, Engineer, both
of 64 Lawrence Hill in the City and County of Bristol, 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 :-
Our invention is for an improved machine for grinding, bevelling, and polishing
glass plates and the like; and consists of a novel arrangement of parts whereby great
freedom for manipulation is obtained, and a nicety of speed adjustment in driving, or
starting and stopping the machine is effected; to the exclusion of toothed gearing and
belting.
The machine is driven from a line of shafting by the frictional contact of a pair
of wheels, and the steadiness of motion thereby produced is in favourable contrast
when compared with machines driven by toothed gearing or by pulleys and
belting.
Having reference to the accompanying drawings, Fig. 1 is a view of our improved
machine partly in section. A mill head or table a, is rigidly fitted to a vertical
spindle b, the said spindle rotative in a footstep bearing 6, and a journal 63, formed
in the rigid frame c. The said frame is provided with a flange d, to which is bolted
a trough d', suitably.
Another flange e, forms the base of the machine, and thereby the whole is rigidly
bolted to the floor.
A banger is bolted to the underside of the flange e, and the said hanger carries
the footstep bearing b. A stud f with adjustinent vertically, carries a steel ball,
upon which revolves the spindle b, and the said adjustment is effected by a lever f³,
having its fulcrum in the frame at f³.
The said lever is operated by a hand wheel and nut g, and a screwed rod g',
movably jointed to the lever at g³.
The friction disc h, is rigidly fitted to the spindle b, and motion is communicated
to the face of the said disc by a wheel ', at the circumference of the wheel.
The said wheel is mounted upon a sleeve i, the said sleeve partially split and rigidly
clamped upon the driving shaft j, by means of nuts k, k. The sleeve is provided
with keys 1, 1, engaging with grooves in the boss of the wheel h', and the said wheel
slides horizontally upon the said keys when necessary in order to vary the speed of
the spindle b.
The wheel his operated upon the sleeve by means of a forked lever m, hinged
at m', and by a slotted bar or striker n, adjustable and secured at n¹ in the frame.
The driving shaft j, is journalled in a bearing o on the hanger f, and one driving
shaft is arranged to drive a series of machines if desired.
In virtue of the clamped sleeve on the line shafting j, our machine can be moved
along the said shafting to any required position, as the said sleeve can be gripped
apon the shaft at any point that may be desired.
Fig. 2 is a partial elevation of the machine at the left of, and at right angles to
Fig. 1, and shows the striker n, forked lever m, disc h, wheel ¹, frame c, sleeve i,
feathers 1, 1, nuts k, k. Other parts are omitted to avoid confusion.

page_text: Fig. 3 is an elevation of the machine in line with the driving shaft, and with the
trough d' omitted.
A clear understanding is had by reference to the lettering, as the same parts are
similarly lettered in all the figures.
The machine is operated by motion from the shaft j, through the smooth wheel h',
which has frictional contact with the disc wheel h, upon the spindle.
The said spindle with the head or table a, rotate together, and the speed is varied
by operating the striker n and forked lever m to move the wheel ¹ upon the face
of the disc h. The machine is started and stopped by dropping or lifting the
spindle b, and disc h, into or out of contact with the wheel h, by means of the
stud f, lever f, and screwed rod g¹, by operating the hand wheel and nut 9.
The said hand wheel may be on any side of the machine conveniently.
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 glass grinding and bevelling machine; the combination with a rotating
head and spindle as described; of a friction disc rigidly fitted to the spindle, and
the spindle adjustable vertically in a footstep bearing for the purpose named.
2. In a glass grinding and bevelling machine, the combination with an adjustable
spindle and friction disc; of a friction wheel mounted on a clamped sleeve as
described; and adjustable horizontally as described, and for the purpose named.
3. In a glass grinding and bevelling machine; the combination with a spindle,
disc, wheel, and clamped sleeve, as described; of a hand wheel and lever for
adjusting the said spindle, disc, and wheel; for the purpose herein set forth, and
substantially as shown and described.
Dated this 15th day of December 1896
H. BRECKNELL.
E. M. MUNRO.