IMPROVEMENTS IN HYDRAULIC MACHINERY FOR PUNCHING, SHEARING, RIVETTING STAMPING OR SIMILAR PURPOSES communicated him
Year: 1883

page_text: LETTERS PATENT to William Robert Lake, of the firm of Haseltine, Lake
and Co, Patent Agents, Southampton Buildings, London, for an Invention
of "IMPROVEMENTS IN HYDRAULIC MACHINERY FOR PUNCHING, SHEARING,
RIVETTING STAMPING OR SIMILAR PURPOSES communicated to him from
abroad by Claudius Jouffray, of Vienne, France, Engineer,
"
1
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 24th February 1883.
WILLIAM ROBERT LAKE of the firm of Haseltine Lake and Patent Agents
Southampton Buildings London "IMPROVEMENTS IN HYDRAULIC MACHINERY FOR
PUNCHING, SHEARING, RIVETTING, STAMPING OR SIMILAR PURPOSES [A communi-
cation to him from abroad by Claudius Jouffray, of Vienne, France, Engineer,]
"
This invention relates to improvements in punching, shearing, rivetting or
stamping machines or other machines in which the tool has an alternative to-and-
fro motion.
I will describe the said improvements as applied to a punching machine. In
constructing such a machine I provide a frame having a cylinder fixed to, or forming
a part of, the same, in which cylinder is arranged a piston which is operated by
hydraulic power. This piston is provided with a rod having rack teeth engaging
with a toothed pinion at the extremity of a lever furnished at its other end with a
counterweight. Another lever is arranged to act upon a valve as hereinafter set
forth. The punch is fixed to the piston-rod and the counterpunch or die is placed
in the said frame, a hole being provided for the delivery of the pieces removed by
the punch. The stroke of the piston can be regulated according to the thickness of
the material to be punched.
The water is forced into the cylinder by a pump or an accumulator through a
pipe, this water enters by the cover of the cylinder and causes the leather or india-
rubber forming the joint of the cover, as well as of the piston, to stretch, and the

page_text: said leather or india-rubber is distended and forced against the sides of the cylinder
and against the piston, thus ensuring tightness of the joints.
One important characteristic of the improved machine is the automatic return of
the tool. The said valve is lifted by the lever through the medium of a rod resting
upon a spring plate fixed to another lever pivotted transversely to the first lever.
A spiral spring causes the descent of the said rod when the lever is released, and is
less powerful than the spring plate.
The result of this arrangement is that when the spring plate comes in contact
with the said rod of the valve, the latter being held down by the pressure, offers
resistance, the spring yields until it bears upon the second lever, then the valve is
forcibly raised, but as soon as it has opened, a slight passage for the water the
pressure being annulled, the spring-plate expands and at once causes the opening
necessary for the outlet. The said counterweight acts as soon to remove the
punch.
The regulation of the stroke of the piston according to the thickness of the
material to be punched is effected by means of the first lever which acts upon the
said valve, when an axle or rod fixed to the piston-rod meets a set screw which is
adjusted according to the thickness of the said material. The first lever is furnished
with a counterweight sufficient to overcome all the friction and to force back the
water into the discharge pipe as soon as the said valve is opened.
In order to arrest the tool, another valve is employed operated by means of a
screw-spindle actuated by a hand-wheel and opening a passage for the water under
pressure which can pass into the discharge pipe by a channel formed in the valve
casing
In the pressure conduit, at any point between the pump and the cylinder, is
placed a safety-valve with an adjustable weight to limit the pressure produced by
the pump. This arrangement is particularly useful in stamping machines in which,
after the contact of the matrices, the pressure might rise sufficiently to cause a
rupture of the parts of the machine_
These machines may be made portable or may be arranged upon a suitable
carriage for removal from place to place in a workshop or yard, or to run upon
rails. Moreover the pump or other device for producing pressure may be fitted
upon the machine if desired, and motion-is imparted to the pump either by a lever
or other suitable means

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
24th August 1883.
WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, and Co, Patent Agents,
Southampton Buildings, London "IMPROVEMENTS IN HYDRAULIC MACHINERY
" A com-
FOR PUNCHING, SHEARING, RIVETTING, STAMPING, OR SIMILAR PURPOSES
munication to me from abroad by Claudius Jouffray, of Vienne, France, Engineer,
This invention relates to hydraulic punching, shearing, rivetting or stamping
machines or other hydraulic machines in which the tool has an alternate to-and-fro
motion.
:
I will describe the said improvements as applied to a punching machine.
In the accompanying drawing
Figure 1 is a side elevation of a punching machine constructed according to this.
invention
The remaining Figures are views of details hereinafter described
Like letters indicate corresponding parts throughout the drawing
A indicates the frame of the machine having a cast iron cylinder B formed
integral therewith. Within this cylinder, is arranged a piston which is operated by
bydraulic power. This piston is provided with a rod c having a rack d engaging
with a toothed pinion D at the extremity of a lever E furnished at its other end
with a counterweight 2. Another lever H is arranged to act upon a valve as
hereinafter set forth. The punch F is fixed to the piston-rod c and the counter-
punch or die G is placed at a in the frame; a hole b is provided for the delivery of
the pieces removed by the punch
The stroke of the piston can be regulated according to the thickness of the
material to be punched.
The water is forced into the cylinder B by a pump o, or an accumulator sup-
plying several similar tools, through a pipe R; this water enters by the cover P of
the cylinder as shown in Figure 2. and causes the leather or india rubber Q forming
the joint of the cover P, as well as of the piston, to stretch, whereby the said
leather or india-rubber is distended and forced against the sides of the cylinder and
against the piston, thus ensuring perfect tightness of the joints.
One important characteristic of the improved machine is the automatic return of
the tool. The valve I is lifted by the lever H through the medium of a rod y
resting upon a spring-plate X fixed to the lever V pivotted transversely to the
lever H as shown in Figure 4. A spiral spring u causes the descent of the rod y
when the same is released by the said lever, and is less powerful than the
spring X
The result of this arrangement is that when the spring-plate X comes in contact
with the rod y of the valve I, the latter, being held down by the pressure, offers
resistance whereupon the spring X yields until it bears upon the lever V then the
valve is forcibly raised, but as soon as it has opened a slight passage for the water,
the pressure being annulled, the spring-plate X expands and at once causes the
opening necessary for the outlet of water, the counterweight z acting at once to
remove the punch
.
The regulation of the stroke of the piston according to the thickness of the
material to be punched is effected by means of the lever H which acts upon the
valve I and by the cock J. The lever H actuates the valve I when the projection
or pin L fixed to the piston rod c meets one of the set screws m which are adjusted
according to the thickness of the said material.

page_text: The lever E is furnished with a counterweight sufficient to overcome all
friction and to force the water into the discharge pipe as soon as the said valve is
opened.
In order to arrest the tool the cock J is employed and operated by means of a
screw spindle t actuated by the hand-wheel T and opening a passage for the water
under pressure which can pass into the discharge pipe by a channel S formed in
the shell of the cock
•
.
In the pressure conduit at any point between the pump and the cylinder is placed
a safety valve with an adjustable weight to limit the pressure produced by the
pump. This arrangement is particularly useful in stamping machines in which
after the contact of the matrices, the pressure might rise sufficiently to cause a
rupture of the parts of the machine
These machines may be made portable by being arranged upon a suitable
carriage for removal from place to place in a workshop or yard, or to run upon
rails
Moreover the pump or other device for producing pressure may be fitted upon
the machine if desired, and motion may be imparted to the pump either by a lever
-or other suitable means
--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
First. The hydraulic machine for punching, shearing, rivetting, stamping or
similar purposes, having means for automatically returning the tool to its normal
position, substantially as described
Second. The combination of the parts herein before described whereby the
automatic return of the tool is effected.
Third. The employment of a lever having an alternating movement and actuating,
by means of special springs, a valve for the return of water, substantially as
described.
In witness whereof I the said William Robert Lake have hereunto set my
hand and seal this Seventeenth day of August in the year of our Lord One
thousand eight hundred and eighty-three.
=
WM ROBT LAKE (L.S.)