AN IMPROVED MACHINE FOR RIVETTING, PUNCHING, AND SHEARING METAL PLATES
Year: 1879

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 MACHINE FOR RIVETTING, PUNCHING, AND SHEARING METAL
PLATES." A communication from abroad by John Franklin Allen, of the City
and State of New York, United States of America.
Sealed the 16th March 1880, and dated the 26th September 1879.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 26th September 1879.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED MACHINE FOR RIVETTING,
PUNCHING, AND SHEARING METAL PLATES." [A communication from abroad by
John Franklin Allen, of the City and State of New York, United States of
America.]
This Invention relates to machinery for rivetting, punching, and shearing metal
plates, by which machinery when used for rivetting the rivet head is formed
through being compressed between suitable dies placed in the ends 'of hinged or
pivotted levers or arms, the said dies being replaced by suitable tools when the
machine is to be used for punching or shearing.
In carrying the said Invention into practice I provide two levers forming an
elbow or toggle joint between the hinged or pivotted arms and the power employed
for operating the same.
The two arms or levers for containing the dies or other tools are hinged or pivotted
together and turn on a centre. To one extremity of each of these arms or levers
when used for rivetting a suitable die is attached to form the desired head on the
rivet whenever these ends are forced together. A pressure cylinder is attached to
the joint pin on which the arms turn, which cylinder is provided with a suitable
valve for admitting the pressure employed either above or below the piston working
in said cylinder as may be required. This valve is operated by hand through
a lever.
To the end of the piston rod two rods or levers are attached, the other ends of
which are jointed to the projecting ends of the aforesaid pivotted arms or levers.
When pressure is admitted below the piston the outer end of the piston rod will

page_text: be moved to a certain point, and the outer ends of the said rods or levers attached
to the piston rod will be drawn inward, thereby bringing the outer or projecting
ends of the arms or levers which carry the dies so much nearer to each other, thus
causing the other ends of said arms to move a corresponding distance apart to
bring the dies clear of a rivet, and pass the same over and above the projecting
rivet to be headed.
When one of the dies has been placed over the end head of the rivet the pressure
is admitted into the said cylinder so as to force the cylinder piston down again
whereby the ends, of the rods will be forced outward, and consequently the ends
of the arms or levers which carry the dies, and to which these rods are attached,
will also be forced outward, whereby the lower ends of the arms containing the dies
will be forced together to act upon the rivet so as to form the desired head by
compressing or squeezing the metal into the properly shaped die.
When the machine is to be used for punching or shearing the suitable tools for
that purpose must be substituted in place of the said dies.
By means of this application of an elbow or toggle joint between the power and
the arms a very compact, light, and portable machine can be constructed as a
cylinder, of eight inches in diameter, and a pressure of from sixty to seventy
pounds on the square inch will be sufficient to form the head on a rivet one and a
quarter inches in diameter.
In some cases I so modify the construction and arrangement of the machine that
the distance from the centre of the joint pin to the centre of the dies, or the length
of that leverage is somewhat limited, in consequence of which the said dies or
other tools will act towards each other at the beginning of the operation when
moved toward each other at an angle or inclination, and which, particularly when
the machine is to be used for punching, may in some cases be objectionable.
The machine so modified has exactly the same parts, and operates on the same
principle as the machine first berein described, but is so arranged that the distance
from the centre of the joint pin to the centre of the dies, or the length of this
leverage, can be varied as desired without considerably increasing the size or weight
of the machine.
For this purpose the cylinder is hinged to a projecting part of one of the
pivotted arms. The outer end of the piston rod is connected through a rod with
this arm, and through another rod with the other pivotted arm.
By the outward motion of the piston rod the connecting rods will move the two
pivotted arms apart to allow the material to be operated upon to be moved
between the dies or tools. When the piston and piston rod are forced inward the
pivotted arms will be brought together, the connecting rods forming the elbow or
toggle-joint.
I provide projecting pieces, one on each side of the machine, and from which the
same is suspended and balanced.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
-
by the said William Robert Lake in the Great Seal Patent Office on the 25th
March 1880.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED MACHINE FOR RIVETTING,
PUNCHING, AND SHEARING METAL PLATES." A communication from abroad by
John Franklin Allen, of the City and State of New York, United States of
America.
This Invention relates to portable machinery for rivetting, punching, and
shearing metal plates, and consists in a combination of parts comprising two levers
forming an elbow or toggle joint between the power employed for operating the
machine, and hinged or pivotted arms which carry the dies or other tools employed
in the same.
In the accompanying Drawing,-
Figure 1 is a front view of a rivetting machine embodying my Invention.
Figure 2 is a side view of a similar machine with a different arrangement of the
several parts, and embodying the same principle.
A and B are two arms or levers hinged together and turning on the centre C.
To one extremity of these arms or levers suitable dies a, b, are attached to form
the desired head on the rivet whenever these ends are forced together.
In the arrangement illustrated in Figure 1 a pressure cylinder D is attached to
the joint-piece C, and is provided with a suitable valve for admitting the pressure
employed either above or below the piston working in the said cylinder as may be
required. This valve is operated by hand through the lever L.
To the end of the piston-rod at E two levers G and G¹ are attached, the other
ends of the said levers being jointed at F and H to the projecting ends of the arms
or levers B and A.
When the parts are in the position shewn in the Drawing, and pressure is
admitted below the aforesaid piston, the end E of the piston-rod will be moved to a
point E, and the outer ends of the rods or levers G and G' will move from F and
H to F and H, thereby moving the outer or projecting ends of the levers A and B
as much together, and causing the other ends of said arms, to which the dies a and
b are attached, to move a corresponding distance apart to move the dies over
and above the projecting part of the newly inserted rivet ready for heading the
same.
When one of the said dies has been placed over the end head of the rivet the
pressure is admitted into the cylinder D to force the cylinder piston down again,
whereby the ends of the rods G and G', and consequently the ends of the arms
A, B, to which these rods G, G', are attached, will be forced outward again, and
the lower ends of the said arms containing the dies a and b forced together to act
upon the rivet to form the desired head by compressing or squeezing the metal
into the properly shaped die.
When the machine to be used for punching or shearing suitable tools for
either of these purposes must be substituted in place of the said dies a and b.
By this application of an elbow or toggle-joint between the power and the arms
a very compact, light, and portable machine can be constructed, and a machine with
a cylinder of eight inches in diameter and a pressure of from 60 to 75 pounds per
square inch will be sufficient to form a head on a rivet one and a quarter inch in
diameter..
In the machine represented in Figure 2 the same parts are combined and
operate upon the same principle, but this arrangement allows the distance from the
centre of the joint pin C to the centre of the dies a and b, or the length of this
leverage to be varied as desired without greatly increasing the size or weight of
the machine.

page_text: In this Figure A and B are the two arms jointed together at C, and having on
their other ends the dies or other tools, as shewn at a and b. To a projecting part
B₁ of the arm B the cylinder D is hinged. The end of the piston-rod at E is
connected through a rod G with the arm B at F, and through the rods G¹ with the
arm A. at H. The parts being in the position shewn, the outward motion of the
piston rod (supposing the arm B and consequently the centre F to remain stationary)
will cause the rods G and G¹ to move into the position indicated by the dotted
lines whereby the arms A and B will be moved apart to permit the machine to be
moved over the rivet to be operated upon.
When one of the dies has been placed over the end-head of the rivet and the
piston and piston-rod are forced inward the arms A and B will be brought together
again, as the three centres E, F, and H, are brought in a straight line, or nearly so,
the rods G and G¹ forming the elbow or toggle-joint, and the dies will act upon the
rivet to form the desired head by compressing or squeezing the metal into the
properly shaped die.
The machines above described are suspended and balanced on pins J, one of
which projects at each side of the same.
Instead of using two levers turning on a centre I sometimes employ a solid jaw
Into the lower
with a suitable projecting arm to which the cylinder is attached.
part of this jaw a die similar to the die a is attached, while the upper die is capable
of sliding through a suitable hub or boss in the upper part of this jaw. The rods
G and G¹ in this case are arranged in a similar manner to that represented in
Figure 2, with the exception that the rods G' will be attached to the upper part of
the jaw, and the rod G to the upper end of the movable upper die which passes
through the hub or boss in the said jaw. The operation of these parts will be
similar to that of the machine represented in Figure 2, but by this arrangement
a perfect straight or parallel motion between the dies will be obtained.
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,-
In a rivetting, punching, or shearing machine the combination of the pressure
cylinder and piston, the piston-rod, the rods G and G¹ forming an elbow or toggle-
joint, and the hinged arms A and B, with suitable dies or other tools, arranged and
operating substantially in the manner and for the purpose set forth.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Twenty fifth day of March, in the year of our Lord
One thousand eight hundred and eighty.
TITM DADT TAZT