AN IMPROVED MACHINE FOR SHEARING OR CLIPPING BOILER PLATES
Year: 1876

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "AN IMPROVED
MACHINE FOR SHEARING OR CLIPPING BOILER PLATES," A communication
from abroad by Ebenezer Fisher, of Kincardine, in the Province of Ontario,
and Dominion of Canada.
Sealed the 23rd June 1876, and dated the 25th January 1876.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark ab
the Office of the Commissioners of Patents on the 25th January 1876.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middle-
sex, Patent Agent. "AN IMPROVED MACHINE FOR STEARING OR CLIPPING BOILER
PLATES."
This Invention relates to a machine for shearing or clipping boiler plates, in
which an obliquely arranged stationary cutter is employed, and also to an adjustable
gauge for regulating the plates to the cutters.
According to this Invention the stationary shear is arranged in a plane so inclined
to the movable shear that the edge of the plate being cut is bevelled suitably for
caulking, the machine being at same time so inclined by means of a standard at the
rear end of the bed plate that the plate lays flat or horizontally on the stationary
cutter, whereby it can be operated to better advantage than it could be if the
machine stood upright. The standard is hinged to the bed plate in order to fold up
to pack the machine away conveniently. The cam which operates the lever to
which the movable cutter is connected is concaved in the back, so as to let the lever
fall back to raise the cutter as quickly as possible, and hold it up to afford as much
time as can be during each revolution to shift the plates. The gauge for regulating
the plates to the cutters is fixed adjustably on a fastening bolt, which holds it in
position, and is itself adjusted by a screw bolt, which supports it against the shocks
of the plates.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Melville Clark in the Great Seal Patent Office on the
23rd June 1876.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent. "AN IMPROVED MACHINE FOR SHEARING OR CLIPPING BOILER
LP 171

page_text: Figure 1 is a sectional view of the improved machine.
Figure 2 is a front elevation, and Figure 3 is a view partly in side elevation and
partly in section, showing details of gauge.
Similar letters of reference indicate corresponding parts in the three Figures.
A is the movable and B the stationary cutter; C, the lever; and D, the cam;
and E, a spring for raising the movable cutter. Cutter B is inclined, as shown, to
the other one to bevel the edges of the plates suitably for calking, and in order that
the plate and cutter B may have a horizontal position the machine is tilted up
at the rear end of the bed plate F by tho standard G, or can be manufactured so as
to have the bed plate F lie in a horizontal position by giving the head and face of
the machine the desired angle. The cam is convexed so as to let the lever travel
on it, and is so contrived as to let the lever fall back to raise cutter A as quick
as possible, and remain elevated to afford as much time as can be during cach
revolution to shift the plates. G₁, Figure 3, is a gauge to regulate the position of
the plates when presented to the cutters. It is formed with a slot, and shifts along
the screw H, which holds it in position, and is itself adjusted by the screw I, which
also supports it against the shocks of the plates.
The movable cutter A can also be made to work by eccentric gears, or any other
movements that may be desired or required.
Having described the nature of the said Invention and the inanner of performing
the same, I declare that what I claim as the Invention to be protected by the
herein-before in part recited Letters Patent is, the combination of movable cutter A,
obliquely arranged or inclined towards the stationary cutter B and the edge of the
stationary cutter B at an angle so inclined to the movable cutter A as to cause a
bevel edge to be cut thereby, and at same time to have stationary cutter B lie in a
horizontal position, so that the plate or bar to be clipped lies flat or horizontally on
cutter B, as shown, and for the purpose herein specified.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Twenty-third day of June, in the year of our Lord
One thousand eight hundred and seventy-six.
A. M. CLARK. (L.S.)