AN IMPROVED METHOD OF GRINDING GLASS TUMBLERS, BEER MUGS OR SIMILAR ARTICLES
Year: 1883

page_text: LETTERS PATENT to William Robert Lake of the firm of Haseltine Lake
and Co, Patent Agents, Southampton Buildings, London for an Invention
of "AN IMPROVED METHOD OF GRINDING GLASS TUMBLERS, BEER MUGS OR
SIMILAR ARTICLES communicated to him from abroad by Orlando W.
Minard of Johnsville, Pennsylvania, United States of America.
"
PROVISIONAL SPECIFICATION left by the said William Robert Lake at
the Office of the Commissioners of Patents on the 10th July 1883.
WILLIAM ROBERT LAKE of the firm of Haseltine, Lake, & Co Patent Agents,
Southampton Buildings London "AN IMPROVED METHOD OF GRINDING GLASS
TUMBLERS, BEER MUGS OR SIMILAR ARTICLES "-[A communication to him from
abroad by Orlando W. Minard of Johnsville, Pennsylvania, United States of
America.]
This invention relates to an improved method of grinding the bases of glass
tumblers, beer mugs, and other like articles, the object of the said invention being
to ensure a uniform pressure of all parts of the base of the tumbler or other
article upon the grinding disc.
In carrying the said invention into practice I prefer to use a machine
substantially like that in common use for grinding the mouths of fruit jars
and other glass vessels wherein there is a rapidly revolving grinding disc
secured to a vertical shaft and a carrier secured to a slowly revolving vertical
shaft, to which is also secured a plate the carrier having a number of openings for
the reception of tumblers, the bases of which have to be ground. I secure to the
said plate a series of guiding brackets, one for each opening in the carrier, and
to each bracket I fit a sliding spindle, each spindle being situated centrally in
respect to one of the openings in the carrier. Each spindle carries a suitable
weight and has an enlargement preferably clothed with leather or tipped with
India rubber, said enlargement resting on the bottom of the tumbler in the inside
of the same.
A spiral spring may surround the spindle and press the tumbler
against the grinding surface, but this is not essential.
When a tumbler has been sufficiently ground at the base, it may be easily

page_text: removed from the carrier after first raising the spindle to make way for the
introduction of an unground tumbler into the opening of the said carrier from
which the ground tumbler is removed.
I am aware that in machines for grinding the bases of glass tumblers, it has
been proposed to use a spindle having a chuck adapted to the interior of the
tumbler, and serving to rotate the same and press the base against a grinding
wheel or disc, but in such cases the chuck must be adapted to the sides as well as
the bottom of the tumbler, and the parallelism of said tumbler with the spindle
depends upon the truth of its sides, so that any defect of the tumbler in this
respect will result in defective grinding of the base, whereas when the tumbler is
pressed against the grinding disc by means of a weight having an effective bearing
on the bottom only, of the tumbler, there must be a uniform pressure of all parts
of the base against the grinding disc, and the base being true as delivered by the
mould, there must necessarily be a true grinding of the base.
-
The pressure may, if desired, be imparted by a weight comprising a small bag
of shot resting on the bottom of the tumbler, such a weight being loose and
self levelling, so that the sides of the tumbler have no influence on its action.
Instead of the weight being within the tumbler or other article a loose weight
may rest on the top edge of the same, bearing theroon at intervals.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by,
the said William Robert Lake in the Patent Office on the 10th January
1884.
"
WILLIAM ROBERT LAKE of the firm of Haseltine, Lake and Co, Patent Agents,
Southampton Buildings, London. "AN IMPROVED METHOD OF GRINDING GLASS'
TUMBLERS, BEER MUGS, OR SIMILAR ARTICLES a communication to me from
abroad by Orlando W. Minard, of Johnsville, Pennsylvania, United States of
America.
This invention relates to an improved method of grinding the bases of glass
tumblers, beer mugs and other like articles, the object of the said invention being
to ensure an uniform pressure of all parts of the base of the tumbler or other
article upon the grinding disc.
In the accompanying drawing
Figure 1 represents a portion of a machine for grinding glass tumblers and the
like according to this invention
Figure 2 is a view drawn to an enlarged scale illustrating a modification
In carrying the said invention into practice I prefer to use a machine.
substantially like that in common use for grinding the mouths of fruit jars and
other glass vessels, a portion of such a machine with appliances for conducting
the process which constitutes this invention being illustrated in Figure 1, in
which B indicates a part of a rapidly revolving grinding disc secured to a vertical
shaft B.
A indicates a carrier secured to the slowly revolving vertical shaft H, to which
is also secured a plate G. The carrier A has a number of openings for the
reception of tumblers, the bases of which have to be ground.
I.secure to a plate G a series of guiding brackets F, one for each opening in
the carrier, and to each bracket I fit a sliding spindle E, each spindle being situated
centrally in respect to one of the openings in the carrier. Each spindle carries a
suitable weight and has an enlargement e preferably covered with leather or tipped
with India rubber, the said enlargement resting on the bottom of the tumbler W,
in the inside of the same. A spiral spring may surround the spindle and press the
tumbler against the grinding surface, but this is not essential.
When a tumbler has been sufficiently ground at the base, it may be easily
removed from the carrier, after first raising the spindle, to allow the introduction
of an unground tumbler into the opening of the said carrier from which the ground
tumbler is removed.
I am aware that in machines for grinding the bases of glass tumblers, it has
been proposed to use a spindle having a chuck adapted to the interior of the
tumbler, and serving to rotate the same and press the base against a grinding
wheel or disc, but in such cases the chuck must be adapted to the sides as well as
the bottom of the tumbler, and the parallelism of the said tumbler with the
spindle depends upon the truth of its sides, so that any defect of the tumbler in
this respect will result in defective grinding of the base, whereas when the
tumbler is pressed against the grinding disc by means of a weight having an
effective bearing on the bottom only of the tumbler, there must be an uniform
pressure of all parts of the base against the grinding disc, and the base being
true as delivered by the mould, there must necessarily be a true grinding of
the .base.
The pressure may, if desired, be imparted by a weight such as shown in Figure 2,
in which W' indicates a small bag of shot resting on the bottom of the tumbler.

page_text: Such a weight is loose and self levelling, so that the sides of the tumbler have no
influence on its action.
Instead of the weight being within the tumbler or other article a loose weight
may rest on the top edge of the same, bearing thereon at intervals.
Having thus fully described the said invention as communicated to me by my
Foreign Correspondent, and the manner of performing the same, I wish it
understood that I Claim!
'
The method herein before described of finishing or grinding the bases; of glass
tumblers, the said method consisting in forcing the base of the tumbler against
the grinding surface by means of a weight bearing on the bottom of the tumbler,
and uninfluenced in its action by the sides of the same, as set. forth.
In Witness whereof I the said William Robert Lake have hereunto set my hand
and seal this tenth day of January in the year of Our Lord one thousand eight
hundred and eighty four.