IMPROVEMENTS IN APPARATUS FOR GRINDING AND SMOOTHING PLATE GLASS
Year: 1879

page_text: LETTERS PATENT to William Windle Pilkington, of St. Helen's, in the County
of Lancaster, Glass Manufacturer, for the Invention of "IMPROVEMENTS IN
APPARATUS FOR GRINDING AND SMOOTHING PLATE GLASS."
HOW
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PROVISIONAL SPECIFICATION left by the said William Windle Pilkington
at the Office of the Commissioners of Patents on the 23rd September 1879.
WILLIAM WINDLE PILKINGTON, of St. Helen's, in the County of Lancaster, Glass
Manufacturer. "IMPROVEMENTS IN APPARATUS FOR GRINDING AND SMOOTHING
PLATE GLASS."
My Invention relates to apparatus or machinery for grinding and smoothing
glass, and consists mainly of a novel combination of parts for giving motion to and
controlling the motion of runners used for the purposes mentioned. Such apparatus
or machinery is applicable when the carrying bench is made to move, or is
stationary, and when runners have a simple rotative or similar motion given to
them; the essential object being to give motion to the runners in a true plane
without jerks or lateral movements.
To a runner of any ordinary or desired construction, usually of size sufficient to
cover the whole surface of the glass to be ground or smoothed, I connect at or near
the centre thereof by stud, pin, or other means a crank which serves as a driving
crank. Rotative motion is imparted thereto by gearing or couplings from any
convenient power. In addition to the said crank, called the driving crank, I also
connect to the runner a second crank called the controlling or guiding crank. This
latter has motion imparted to it, and moves in the same direction as the
former one.
In some cases, particularly for smoothing, where it may be desirable to give an
easy regular lateral sliding movement to the runner, I cause the pin of the con-.
trolling or guiding crank to fit into and move, when the apparatus is at work, in a
slot or groove carried by or formed in or on the runner.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Windle Pilkington in the Great Seal Patent Office on the
23rd March 1880.
WILLIAM WINDLE PILKINGTON, of St. Helen's, in the County of Lancaster, Glass
Manufacturer. "IMPROVEMENTS IN APPARATUS FOR GRINDING AND SMOOTHING
PLATE GLASS."
My Invention relates to apparatus or machinery for grinding and smoothing
glass, and consists mainly of a novel combination of parts for giving motion to and
controlling the motion of runners used for the purposes mentioned. Such apparatus
or machinery is applicable when the carrying bench is made to move, or is
stationary, and when runners have a simple rotative or similar motion given to
them; the essential object being to give motion to the runners in a true plane
without jerks or lateral movements.
To a runner of any ordinary or desired construction, usually of size sufficient to
cover the whole surface of the glass to be ground or smoothed, I connect at or
near the centre thereof by stud, pin, or other means a crank which serves as a
driving crank. Rotative motion is imparted thereto by gearing or couplings from
any convenient power. In addition to the said crank, called the driving crank,
I also connect to the runner a second crank called the controlling or driving crank.
This latter has motion imparted to it and moves in the same direction as the
former one.
In some cases, particularly for smoothing, where it may be desirable to give an
easy regular lateral sliding movement to the runner; I cause the pin of the
controlling or guiding crank to fit into and move, when the apparatus is at work,
in a slot or groove carried by or formed in or on the runner.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a side view of apparatus constructed under my Invention, and Fig. 2,
a plan view of the runner. a is the runner of ordinary construction and of size
eufficient to cover the whole surface of the glass to be ground or smoothed. A stud
or pin 6 which is firmly secured to the said runner at its centre fits into a bearing
in the driving crank c. Rotative motion is imparted to the crank c from the
shaft d driven by any convenient power through the spindle e and bevel gearing f;
g, controlling or grinding crank, receiving motion in the same direction as the
driving crank c through the toothed gearing h.
The said controlling crank g is shown fitted with a pin i working in a slot or
groovej in the piece k attached to the runner. This arrangement of parts gives
the runner an easy regular lateral sliding movement very suitable when it is
desired to smooth the glass. If the operation being performed is grinding, the
pin of the crank g is by preference caused to work in the bearing attached to
the opposite end of the runner, which is reversed in position for that purpose.
m, carrying framework; n, table; o, glass being ground or smoothed. Runners
are when desired constructed with the central pin and with the slot or groove j, or
bearing alone when it is desired to employ them for grinding or smoothing only.
Instead of the central pin being secured to the runner it is in some cases attached
to or formed with the crank and works in a bearing in the runner.
Having now described and ascertained the nature of my said Invention in such
manner that others will be enabled to carry my improvements into effect,
I claim,―
First. In combination with a runner, driving and controlling cranks moving
together, substantially as set forth.

page_text: Second. In combination with a runner driving and controlling cranks connected
together by gearing, and operating substantially as set forth.
Third. Constructing and combining apparatus for grinding and smoothing glass,
substantially as set forth.
:
In witness whereof, I, the said William Windle Pilkington, have hereunto
set my hand and seal, this 22nd day of March, in the year of our Lord
One thousand eight hundred and eighty.
Witness,
JOSEPH MATHER,
Book-keeper,
St. Helen's.
WILLIAM WINDLE PILKINGTON. (L.S.)