Improvements in Apparatus for Cutting Glass.
Year: 1890

page_text: Date of Application, 7th Nov., 1890
Complete Specification Left, 7th Aug, 1891-Accepted, 26th Sept., 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Cutting Glass.
I JAMES WILLIAM THOMAS CADETT of Ashstead Surrey Photographic Plate
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention more particularly relates to cutting glass for photographic
purposes and has for its object to facilitate the operation and to ensure greater
certainty therein, thus avoiding waste of material.
My improved cutting apparatus consists of a movable arm furnished with a
double hinge whereby it is attached tranversely to a cutting board. The hinge is
fitted with a coiled or other spring which imparts a spring motion to the arm.
Mounted on the latter is a sliding carriage furnished with a holder carrying a
diamond and also with an adjustable bracket. The holder has a vertical move-
ment and is fitted with a spring that keeps the movable arm clear of the glass
until it is depressed and when so depressed regulates the pressure of the diamond
on the plate. The bracket is furnished with a suitable stop and with a small
roller.
The glass having been placed in position the sliding carriage is drawn forward
until the stop comes against the glass thus arresting the movement of the carriage
which is then depressed, thereby depressing the bracket and bringing the roller in
contact with the glass. In so doing the bracket is raised and the stop carried
clear of the glass thus leaving the carriage free to be again moved forward. On
downward pressure being applied thereto the diamond comes in contact with the
glass thus raising the holder. By this means the downward pressure of the holder
spring is brought into play and on drawing the sliding carriage over the glass it is
severed.
To ensure dividing the plate exactly in half I fit the cutting board with two
slides which are connected by lazy tongs so arranged that the slides approach or
recede from each other at a uniform speed. The glass being placed between such
slides they are operated until they both clip the glass and hold it in position so
that the diamond on being drawn across it in the manner above described divides
the plate exactly in half. Such slides may however be dispensed with when such
accuracy of division is unnecessary.
L 15
Nam1000
ELT & Co.,
33, Southampton Buildings, Holborn, London,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Cutting Glass.
1, JAMES WILLIAM THOMAS CADETT of Ashstead, Surrey, Photographic
Plate 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 :-
This invention more particularly relates to cutting glass for photographic
purposes, and has for its object to facilitate the operation, and to ensure greater
certainty therein, thus avoiding waste. In the accompanying drawings
Figure 1. shews a plan, and Figures 2. and 3 end and front elevations of my
improved apparatus.
In Figs. 1 and 2 the movable cross bar presently described is shewn down;
while in Fig. 3 it is shewn raised and thrown back. Such apparatus consists of a

page_text: movable cross bar a, fastened by a double hinge b, to a block c, fixed at one side of
a cutting board d. This board is made in two halves, which are joined together
by cross ties d', so as to leave a central longitudinal opening 2 between them. Or
the board may be made in one piece and a central slot or groove formed therein.
Such opening or groove allows of two slides e, fitted with studs e' whereby they are
manipulated, and connected by lazy tongs working on a fixed central pivot f',
being operated to and fro, so as to grip or release the glass which is placed between
them to be cut, as required. A recessed bridge piece g, wherein the cross bar
rests when down. is fixed to the other side of the board opposite the hinge block c.
A spring action is imparted to the double hinge, and through it to the cross bar, by a
coiled spring mounted on a pin i which passes through a slot in the hinder hinge
and is fixed in the board in any convenient manner. Fitted to such cross bar is a
sliding carriage j furnished with a purchase k and holder 1, which latter carries a
glazier's diamond, the position whereof is regulated by means of an adjusting
screw m. Or such screw may be dispensed with and it may be regulated by hand.
The holder is hinged to a rod n pivoted in lugs o o', placed one on each side of the
sliding carriage, and is fitted with a regulating spring p. carried on a vertical rod q,
to regulate the pressure of the diamond on the glass. A crank arm r, (in my
Provisional Specification termed a bracket,) is mounted loose on a pin s, fixed to
an extension formed on the lug o. The inner bend of such arm carries a roller t,
and terminates in a curve which engages with a stop u, thus preventing the
free end of the crank arm dropping too low when the cross bar is down. The
outer bend carries a catch v which when the carriage is drawn forward comes
in contact with the edge of the glass thus arresting the carriage. The cross
bar is then depressed by means of the purchase & whereby the roller is brought
against the upper surface of the glass, thus raising the outer bend, and lifting the
catch a clear of the glass. The carriage is then free to move forward, and by
again depressing the cross bar the point of the diamond is brought against the
glass and kept there by the spring p, so that on drawing the carriage forward
the diamond cuts the glass. d³ is a finger hole in the cutting board, to allow of the
finger being inserted underneath the glass after it is cut, so as to readily remove the
same. c. is a support against which the cross bar rests when raised, thus pre-
venting its falling back too far. x is a guard string which is placed under the edge
of the glass while being cut so as to keep its under surface a sufficient distance
from the board to prevent any injury to the film. y is a guide groove cut in the
board to indicate the line of travel to which the diamond is to be adjusted. The
object of fitting the board with slides is to ensure dividing the plate exactly in half,
but when cutting glass to different gauges for ordinary purposes such slides may be
dispensed with, and the cross bar together with its sliding carriage, holder and
crank arm may be fitted to any suitable cutting board. I do not confine myself to
the precise details of construction hereinbefore described and shewn as they
admit of some modification without departing from the essential features of my
invention.
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:
1° The improved apparatus for cutting glass all substantially as hereinbefore
described, and shewn in the accompanying drawings.
2° Fitting any suitable board for cutting glass with a movable cross bar
carrying a sliding carriage, holder and crank arm, and otherwise constructed,
arranged, and fitted, all substantially as hereinbefore described and shewn.
1001
ROUT
Dated this Seventh day of August 18
ELT & Co.,
33, Southampton Buildings, Holborn, London,
Agents for Applicant.