Improvements in Machinery for Polishing or Surfacing Glass for Various Purposes.
Year: 1888

page_text: Date of Application, 1st Dec., 1888
Complete Specification Left, 28th Aug., 1889-Accepted, 26th Oct., 1889
PROVISIONAL SPECIFICATION
Improvements in Machinery for Polishing or Surfacing Glass for
Various Purposes.
I, JOEL CADBURY of the firm of Green Cadbury and Company, of Great Hampton
treet, Birmingham, in the County of Warwick, Manufacturer, do hereby declare
he nature of this invention to be as follows:-
Ordinary sheet glass of commerce, is often fogged or clouded upon its surface, thus
endering it valueless for certain purposes, and especially when such surface is required
o be silvered.
My invention has for its object, the removal of the said clouded or fogged parts,
which are usually disposed in irregular patches over the surface of the said glass as
foresaid.
Usually, these said patches are removed by manual labour.
In carrying out my invention, I employ machinery as herein-after described.
Mounted upon a bed, and working within suitable bearings, I arrange a drum or
roller, surfaced or faced with cross grained felt, or otherwise. I take a series of cut-
out felt rings, and string them upon a drum, with clamping plates at its ends, so that
the said felt rings can be drawn or pressed closely together, by a screw, clamping or
other device.
The outer surfaces of the rings, present the cross grain of the felt, and when closely
clamped together, they form a compact polishing surface.
This faced drum, is driven by a band or other gear, from the driving or supplementary
shaft, while the bed of the machine, which is at a lower elevation than the periphery
of the drum, carries a slide with a rack upon its underside, with which a toothed
wheel engages. The axis of this said toothed wheel, is provided with a winch handle
for reciprocating the slide under the drum, when a plate is being polished.
The top face of the slide has a rib stop near its front end, against which, the front
edge of a plate of glass to be polished or operated upon, comes, when the same is made
to traverse under, and in contact with, the surface of the polishing drum.
Disposed at the rear of the polishing drum, is a guard or roller, kept up to its
work, or in position, by a spring, and is adapted for preventing the rising or tilting of
the plate of glass, when the same has nearly completed its traverse.
The bearings or bearing blocks of the polishing drum, are made yielding, by
disposing them between spring supports or springs, which allow the drum to accomodate
itself to any sized plate, to be surfaced or operated upon.
Instead of employing springs for bringing the polishing roller to the surface of the
plate, weights or their equivalents may be employed; and instead of the polishing
5 roller accomodating itself to the plate, the bed or slide, which is only a plate carrier
may be made to yield.
To surface a plate, place it upon the slide, which is moved forward under the drum
by a winch handle or power, during the rapid rotary motion given to the polishing
drum, and immediately the slide proceeds further than the said drum, the plate upor
0 it, comes under the secondary and yielding roller, which thereby prevents it from
rising.
The reciprocation of the plate under the polishing roller, (by the aid of a powder o
rouge) removes the fogged parts from the surface thus presented, and also polishes it
…………. ninth day of November 1888.
T
TARI CADBURY

page_text: COMPLETE SPECIFICATION.
Improvements in Machinery for Polishing or Surfacing Glass for
Various Purposes.
I JOEL CADBURY of the firm of Green Cadbury and Company of Great Hampton
Street, Birmingham in the County of Warwick, Manufacturer, 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 :-
Ordinary sheet glass of commerce, is often fogged or clouded upon its surface, thus
rendering it valueless until removed for certain purposes, and more particularly when
such glass surfaces are to be silvered or otherwise embelished.
This invention has for its object, the removal of the said fogged parts, usually found
in irregular patches.
Heretofore the said patches have been removed by hand labour, whilst in my
invention, I employ machinery, and means, as hereinafter described.
Mounted upon a bed, and working within suitable bearings, I arrange a mop-bob,
or a drum faced with cross grained felt.
The aforesaid bob or drum, is driven by a band or other gear, from a driving or
supplementary shaft, while the bed of the machine, which is at a lower elevation than
the periphery of the drum, has a plate carrying slide, worked by a rack and toothed
wheel, and winch handle for reciprocating the said slide under the bob or drum.
The top face of the slide, has a stop near its front end, against which, the front edge
of a plate of glass to be polished or operated upon, comes, when the same is made to
traverse under, and in contact with, the polishing bob or drum.
Disposed at the rear of the polishing drum, is a guard or roller, kept up to its work,
or in position, by a spring, and is adapted for preventing the rising or tilting of the
plate of glass, when the same has nearly completed its traverse.
The bearings, or bearing blocks of the polishing bob or drum, are made yielding,
by disposing them between spring supports or springs, thus admitting of the bob or
drum, accomodating itself to any thickness plate, operated upon.
Instead of employing springs for bringing the polishing roller to the surface of the
plate, weights or other equivalents may be employed; and instead of the polishing
roller accomodating itself to the plate, the bed or slide which is only a plate carrier,
may be made to yield.
Figure 1 of the accompanying drawing, represents partly in vertical section, and
partly in elevation, a glass polishing or surfacing machine, constructed, arranged and
worked, according to my invention.
Figure 2 represents a mop-bob, employed, and figure 3 shows an end view of the
same.
a is the frame of the machine, a² is a fixed bed thereof, b is a reciprocating table or
glass carrier, with a stop 62, on the top side of its inner end; c is a mop-bob, its
working within yielding bearings, carried by upright brackets, or framings d, on the
two opposite sides of the machine.
The bearing block c², has interposed between its top and bottom sides, and the top
and bottom ends of the slot of the bracket framings, springs d², for keeping the mop-
bob up to its work, and regulating the same.
e is a pulley on the bob axis, and f is an adjusting screw for determining the
position of the said bob axis, on plates of different thicknesses being operated upon.
g is a rubber faced roller, for keeping the glass plates h flat upon the table b, and
for preventing their ends next to the stop, from curling or rising consequent upon
the position of the plate with respect to the bob, and the heat generated during
bobbing.
The roller g, works at the end of an arm g², pivoted at g³, to the framing, and
between the outer end of said arm and framing, is a coiled spring g', for keeping the
roller constantly pressed upon the plate.
The underside of the bed b, has a rack 63, which gears with a pinion i, made fast

page_text: upon an axis 2, to which a lever or arm j, is connected, which on being moved, or
rocked to and fro, gives a reciprocation to the table b.
The mop-bob is driven by a band k, from off a driven pulley 1, on the same shaft as
carries the fast and loose pulleys m.
To operate or surface a plate of glass, place the same on the table b, and with its
four edge against the stop 62, then slowly move the lever j, from right to left, and
from left to right, when the table b, will be reciprocated, and the surface of the glass
presented to the rapidly rotating bob, operated upon.
Rouge or other polishing powder constitutes the polishing medium employed, and is
preferably employed in a moistened state.
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,
First A glass surfacing machine, the combination with a reciprocating table or
glass carrier, of a mop bob, supported within yielding and spring bearings, substantially
as set forth.
Secondly Supporting the bearings of surfacing bobs, of glass polishing or
surfacing machines, by yielding connections, consisting of springs, interposed between
the said bearings, and the supporting framings, as set forth.
Thirdly-Preventing the operated upon sheets of glass, from rising or curling,
by a roller g, kept down by means, substantially as set forth.
Fourthly In a glass surfacing or polishing machine, consisting of a reciprocating
table b, fixed bed a, roller g, and the other accessory parts, substantially as described
and set forth in figure 1.
Dated this 20th day of August 1889.
JOEL CADBURY.
By Henry Skerrett,
Agent for Applicant.