Improvements in or applicable to Hydraulic and other Presses for Punching, Drawing, and otherwise Forming Metal Articles.
Year: 1892

page_text: Date of Application, 26th May, 1892
Complete Specification Left, 27th Mar., 1893-Accepted, 13th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Hydraulic and other Presses for
Punching, Drawing, and otherwise Forming Metal Articles.
I, HENRY AUGUSTUS SCHLUND, of The British Munitions Company Limited,
Northumberland Works, Millwall in the County of London; Engineer do hereby
declare the nature of this invention to be as follows:-
:―
My invention relates to hydraulic and other presses of the kind used for punching,
for drawing or for otherwise forming metal articles, the object of my invention
being to provide improved means for effecting the removal of the article being
operated upon from the punch, die or other tool.
In carrying out my invention I arrange upon the plate or plunger carrying the
tool a device which I term a “knocker-off" which is adapted to slide upon the tool
in such a manner that when operated it will serve to push off the tool any article
thereon. The movement of my "knocker-off" is effected by means of hydraulic
plungers working in small cylinders or cylindrical recesses in the plunger or plate
carrying the tool, the said small plungers being attached to or adapted to act upon
the back of the "knocker-off."
In practice when applying my invention to a hydraulic press I find it
advantageous to make the plate or holder carrying the tool independent of the ram
for operating the same, the said plate sliding upon guides, an independent ram being
advantageously employed for returning the tool plate or holder to its normal
position which in rising carries with it the main ram.
DAL
es of Mar 1900
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant. ·
.
COMPLETE SPECIFICATION.
Improvements in or applicable to Hydraulic and other Presses for
Punching, Drawing, and otherwise Forming Metal Articles.
1, HENRY AUGUSTUS SCHLUND, of The British Munitions Company, Limited,.
of Northumberland Works, Millwall, in the County of London, Engineer, do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement :-
My invention relates to hydraulic and other presses of the kind used for
punching, for drawing or for otherwise forming metal articles, the object of my
invention being to provide improved means for effecting the removal of the article
being operated upon from the punch, die or other tool.
In carrying out my invention I arrange upon the plate or plunger carrying the
tool a device which I term a "knocker off" or stripping plate adapted to slide upon
the tool in such a manner that when operated it will serve to push from off the
tool any article thereon. The movement of my "knocker off" is effected by means
of hydraulic plungers working in small cylinders or cylindrical recesses in the
plunger or plate carrying the tool, the said small plungers being attached to or
adapted to act upon the back of the "knocker off."
In practice when applying my invention to a hydraulic press I find it
advantageous to make the plate or holder carrying the tool independent of the
ram for operating the same, the said plate sliding upon guides, an independent ram
D

page_text: or rams being advantageously employed for returning the tool plate or holder to its
normal position which in rising carries with it the main ram.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which :-
Figure 1 is a sectional front elevation of the upper part of a hydraulic press
provided with iny improvements; and,
Figure 2 is a side elevation of the same.
a, a are the ordinary guide-rods of a hydraulic press, which rods at their lower
ends are secured to the base-plate and at their upper ends carry the cross-head b.
c is the tool-holding plate or plunger which slides upon the rods a, a aud which is
operated by the hydraulic ram d sliding in a cylindrical recess e in the cross-head b.
This ram d is not connected with the plate c but only operates against the same to
depress it, the upward movement of the said plate c being effected by the upwardly
moving rams f,sliding in cylinders g, g in the cross-head b and carrying at their
upper ends cross-bars h, from which the plate c is suspended by the rods i, i, as
shewn most clearly in Figure 2.
jis my "knocker off" or stripping plate which as hereinbefore stated slides upon
the tool. This platej has connected to it two plungers k, k working in cylinders 1,1
in the tool-carrying plate c in such a manner that, when water is introduced into the
said cylinders, 1 above the plungers, the said stripping plate will be moved down to
push from off the punch m any article thereon. As shewn in the drawing the punch
is of a shape which is employed for manufacturing hollow shells or projectiles and the
stripping platej carries a ring or collar n which surrounds the said punch and directly
acts against the article thereon to push it off when the stripping plate j is moved
relatively with the tool-holding plate c. In order that the stripping platej may be
raised after the article has been pushed off the punch I provide for introducing
water below the pistons k, k. o, o are studs or stops screwed into the stripping
plate and serving to limit the downward movement of the said plate.
p is the pipe through which the fluid pressure is introduced into the cylinder e of
the main ram, and q is the pipe through which fluid pressure is introduced into the
cylinders g, 9 for raising the tool-plate c and with it the ram d.
}'
r is the pipe through which the fluid pressure for operating the stripping plate j
to remove an article from the punch is introduced into the cylinders 1, 7 on the
upper sides of the pistons k, k, and s is the pipe through which the fluid pressure
introduced into the cylinders 1, 1 below the pistons k, k for lifting the stripping plate.
As during the time that the ram d is moving downwardly the stripping plate j
must be held against the tool plate the fluid pressure may be supplied through the
pipes and s by means of a common valve and, as during the time that the tool-
plate c with the ram d is being lifted the stripping plate requires to be moved
downwards to push the article off the punch, the pipes y and r may also be
connected with a common valve. As, however, the pipes and s connected to the
plate c move relatively with the pipes p, q it is necessary to provide a movable
connection between the pipes p and r, and and s, for instance as shewn in Figure 1,
where t represents a barrel to which the pipe is permanently connected and
which slides upon the end of the pipe y during the movement of the plate c, the
said barrel also sliding upon the main pipe u through which the water flows. In
the same manner the piper is connected to a barrel v which slides upon the pipe p
and upon the supply pipe w.
Although I have described my invention as applied to a press in which the tool-
holding plate is operated by hydraulic rams or plungers, it is to be understood that
"knocker off" or stripping plate is also applicable to a press in which the
tool-holding plate is operated by a screw or other mechanical device.
my
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. In a hydraulic or other press the combination with the movable tool-holding

page_text: plate or die of a "knocker off" or stripping plate adapted to be moved relatively
therewith by means of hydraulic rams, the hydraulic cylinders for the said rams
being formed within or carried by the said tool-holding plate, substantially as, and
for the purpose, described.
2. In a press the combination with the tool-holding plate provided with a
"knocker off" or stripping plate of the kind hereinbefore described and which is
operated by a hydraulic ram disconnected from the said tool-holding plate, of
hydraulic plungers such as from which the said tool-holding plate is suspended,
substantially as, and for the purpose, described.
Dated this 27th day of March 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant..