AN IMPROVED PUNCH OR PROJECTILE
Year: 1876

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake, & Co.,
Patent Agents, Southampton Buildings, London, for the Invention of "AN
IMPROVED PUNCH OR PROJECTILE." A communication from abroad by De-
Lancy Kennedy, Cornelius Henry Delamater, and George Hazard Robinson,
all of the City, County, and State of New York, United States of America.
led the 19th December 1876, and dated the 14th August 1876.
COMPLETE SPECIFICATION filed by the said William Robert Lake at the
Office of the Commissioners of Patents on the 14th August 1876.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED PUNCH OR PROJECTILE" A
communication from abroad by De Lancy Kennedy, Cornelius Henry Delamater,
and George Hazard Robinson, all of the City, County, and State of New York,
United States of America.
The object of this Invention is to so shape or form the end of a punch or projectile
as to effect a continuous shearing cut in the same manner that the blades of shears
perform the operation in a straight line, and it consists in giving to the ends of such
instruments a spirally inclined contour by which the continuous shearing cut is
effected as the instrument penetrates the substance to be punctured, whether the
latter be a single sheet of metal or a ship's armour plate, and the same applies
whether the instrument is cylindrical, oval, or polygonal. The shearing face of a
projectile constructed in this manner may be of any diameter less than the diameter
of its body portion that will effect the greatest penetration proportioned to its
diameter with a given charge of powder.
DESCRIPTION OF THE DRAWING.
Figure 1 is a face view of a punch or projectile constructed according to this
Invention; Figure 2 is a side view of a projectile the punch form of the front end
of which gives it great penetrating power; Figure 3 is a side view of a punch;
Figure 4 is another side view of the same showing the face of the chisel or perpen-
dicular cut from A, B, to the centre.
In Figures 2 and 3 the cutting edge is seen to descend from the point A, and
wind in a spiral or uniforın manner around the tool until it has performed its circuit
to the point B, and perpendicularly to the starting point A, the spiral cut extend-
ing to the centre of the tool or as nearly so as may be consistent with strength.
[Price 4d.]

page_text: From this it will be seen that only one side or portion of the cutting edge of the
tool is working at one time, and therefore the resistance of the metal or other
substance is reduced to the lowest possible point.
Having thus fully described the said Invention as communicated to ine by my
foreign correspondents, and the manner of carrying the same into operation, I claim
the herein-described punch or projectile constructed with a cutting edge extending
from the point A in a spiral direction to the point B, and from the salient point of
the spiral to the longitudinal centre, as and for the purpose set forth.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Fourteenth day of August, in the year of our Lord One
thousand eight hundred and seventy-six.