IMPROVE- MENTS APPLICABLE TO RIVETTING AND PUNCHING MACHINES
Year: 1877

page_text: LETTERS PATENT to George Goodwin, of Cornwall Road, Bayswater, in the
County of Middlesex, Mechanical Engineer, for the Invention of "IMPROVE-
MENTS APPLICABLE TO RIVETTING AND PUNCHING MACHINES."
PROVISIONAL SPECIFICATION left by the said George Goodwin at the Office
of the Commissioners of Patents on the 9th January 1877.
GEORGE GOODWIN, of Cornwall Road, Bayswater, in the County of Middlesex,
Mechanical Engineer
"IMPROVEMENTS APPLICABLE TO RIVETTING AND PUNCHING
MACHINES."
This Invention relates to improvements in rivetting and punching machines.
My improvements are mainly as follows:-A compound or double steam cylinder is
fastened to two side frames; these frames are made rigid to a bed plate, on the end
of which bed plate and directly opposite to the cylinder is a head or bolster, to the
top of which is attached the "dolly" which receives the force of the blow. Within
the cylinder is a double or differential area piston upon which the steam acts, first
upon one side, and then on the other.
The main valve I prefer to construct in either of the following ways:—
1st. A modification of the ordinary D valve so arranged that first, the space
behind the piston is in communication with the boiler while the front is opened to
the exhaust, then a communication is opened between the front and back of the
piston. This valve can be actuated either by a separate small cylinder and
piston, or directly by a small double ended piston, to which steam is admitted at
each end alternately, the inflow of which steam I regulate either by a hand lever or
a treadle.
2nd. Instead of the D valve a treble or quadruple piston valve may be used.
Or, 3rd. A three-way cock.
:
The mode of operating the machine is as follows:-The work to be operated upon
is placed with the rivet head against the recess in the "dolly," then the man in
charge by placing his foot on the treadle or moving the hand lever admits steam
upon the back of the double ended piston while the other end is opened to the
Price 6d 1

page_text: exhaust; this shuts or moves the main valve over so as to open the induction port,
through which the live steam enters, pushing the piston forward and operating on
the rivet. The space between the bottom of the enlarged part of the cylinder and
piston being always open to the exhaust, allows the escaped gases or even air to
come in, and so annul the vacuum that would otherwise be formed. By relieving
the treadle, same springs back to its former position, which action admits steam to
the front of the double ended piston and opens the back to the exhaust; this of
course pushes the main valve back to its former position, thus shutting the live
steam off, and opening a passage between the front and back of the cylinder. The
steam then entering the front, acting on a large area, overcomes the forward pressure,
so driving the piston back, the steam expanding, and so being utilized as much as
possible. While the piston is being driven back the air space in the cylinder
described above discharges itself through the exhaust port; the operations are then
repeated. The end of the piston rod carrying the striking punch may work in a
bracket fastened to the side framing. The steam cylinder I prefer should be
steam jacketted.
It is evident that the steam to the cylinder may be regulated by any of the
ordinary valve arrangements at present in use.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Goodwin in the Great Seal Patent Office on the 9th July
1877.
GEORGE GOODWIN, of Cornwall Road, Bayswater, in the County of Middlesex,
Mechanical Engineer. "IMPROVEMENTS APPLICABLE TO RIVETTING AND PUNCHING
MACHINES."
This Invention relates to improvements in rivetting and punching machines,
which improvements are as follows:-A compound or double steam cylinder is
fastened to two side frames; these frames are made rigid to a bed plate, on the end
of which bed plate and directly opposite to the cylinder is a head or bolster, to the
top of which is attached the "dolly," which receives the head of the rivet and the
force of the blow. Within the cylinder is a double or differential area piston upon
which the steam acts, first upon one side, and then on the other.
The main valve I prefer to construct in either of the following ways:―
1st. A modification of the ordinary D valve so arranged that first, the space
behind the piston is in communication with the boiler while the front is opened
to the exhaust, then a communication is opened between the front and back of the
piston, the exhaust being then closed. This valve can be actuated either by a
separate small cylinder and piston, or directly by a small double ended piston, which
is attached to the valve, to which steam is admitted at each end alternately, the
inflow of which steam I regulate either by a hand lever or a treadle.
2nd. Instead of the D valve a treble or quadruple piston valve may be used:
Or, 3rd. A three-way cock.
The mode of operating the machine is as follows:-The work to be operated upon
is placed with the rivet end against the recess in the "dolly," then the man in
charge by placing his foot on the treadle or moving the hand lever admits steam on
the back of the double ended piston while the other end is opened to the exhaust;
this moves the main valve over so as to open the induction port, through which the
live steam enters, pushing the piston forward and operating on the rivet. The space
between the bottom of the enlarged part of the cylinder. and piston being always
open to the exhaust, allows the escaped gases or even air to come in, and so annul
the vacuum that would otherwise be formed. By relieving the treadle, the same
springs back to its former position, which action admits steam to the front of the
double ended piston and opens the back to the exhaust; this of course pushes the

page_text: intimated in what manner, the same is to be performed or carried out in practice, I
will now, proceed, aided by the, accompanying Drawings, to further and particularly
describe and ascertain in what manner the same is to be performed or carried out
in practice, that is to say:-
(21)
27/QOOD
10
DESCRIPTION OF THE DRAWINGS,
which illustrate my Invention as applied to revetting. Fig. 1 is side elevation
of my improved arrangements (partly in section); Fig. 2, plan; Fig 3 is sectional
view of steam chest and port of cylinder (on line A, B; Fig. 1); Fig. 4, sectional
view of exhaust pipe, steam chest, and port of cylinder (on-line C, D, Fig. 1).
In these Figs. A, A, is compound or double steam cylinder; B, B, side frames, to
which cylinder A is fastened, said frames being rigid with the bed plate C, C; D, D,
head or bolster attached to and forming part of bed plate C. To the top of the
head or bolster D is attached the portion E which carries the dolly F; G is the double
or differential piston working in cylinder A. The piston rod (H) has at its end the
die I which forms the head of the rivet, which coming immediately opposite F
forms the rivet into shape; K is the inlet pipe; L, the exhaust pipe; M is the
treadle or lever, which by suitable rod and lever, as shewn, actuates the two-way
cock N, said cock regulating the supply of steam to the small cylinder o in which
works a small piston P, which by rod Q is attached to the main valve R (this main
valve in the Drawing being a three piston valve).
The action of my arrangements as illustrated by the Drawing is as follows:-
The work to be rivetted is placed between the "dolly" F and end or die (I) of piston
rod H. The man in charge actuates the treadle or lever M, which action turns the
two-way cock N, admitting steam from inlet pipe K by means of the small pipe k
through the cock N into the small cylinder o. The steam moving the valve R
admits the steam from K through the steam chest K' into the steam port S to the
back of the piston G, said steam driving the piston and rod forward, and with it
the die I, and so operating on the work between F and I. Upon relieving the
pressure on the rod M a spring m acting upon M brings the rod M back to its
former position, operating also in the same manner upon the two-way cock N, the
steam being then admitted to the other side of the small piston P draws back the
main valve R. This action shuts off the steam from inlet K to steam port S, and
at the same time opens a communication from the back to the front of the
differential area piston G, by means of the channel, groove, or recess r at the front
of the valve R. The pressure of the steam being now equalizeḍ on both sides of the
piston G, and owing to the front having a larger area overcomes the forward
pressure, thus driving the piston G back. In Fig. 1, the arrangements are shown
in position for admitting the live steam from inlet K to back of piston G, at the
same time the front end of cylinder A is open to the exhaust pipe L through
the port T. In some cases it might be advisable to admit live steam on both
sides of the differential piston. This, as is obvious, could be readily effected.
Also, the machines may be made double acting by carrying the piston rod H
through both ends of the cylinder A, and having duplicate bolster and "dolly” on

page_text: he other side of the bed plate C. The front portion or larger diameter of the
cylinder should in this case be of increased area.
Although I have shewn in the accompanying Drawings, and herein-before described
with reference thereto, my Invention as applied to rivetting it will be obvious how
it can be applied to punching.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed or put in practice, I
hereby declare that I claim the Invention of "Improvements Applicable to Rivetting
and Punching Machines," substantially as the same is herein-before set forth and
described, wherein the important and particular points or features are,-
1. The differential cylinder with piston working therein, substantially for the
purposes herein-before set forth and described.
2: The valve arrangements for working the said piston, substantially as described.
In witness whereof, I, the said George Goodwin, have hereunto set my hand
and seal, this Ninth day of July, in the year of our Lord One thousand
eigtht hundred and seventy-seven.
:
Witness,
T. MORGAN,
Secretary,
Inventors' Patent Right Ass"., Ld.,
21, Cockspur Street, S.W.
GEORGE GOODWIN. (L.S.)