Enlarged, or Embossed Parts to Receive Stay Bolts.
Year: 1885

page_text: Enlarged, or Embossed Parts to Receive Stay Bolts.
I, ROBERT ANTHONY HARDCASTLE, of 30 Hyde Terrace, Leeds, in the County
of York, Engineer, do hereby declare the nature of this invention to be as
follows:-
My present invention has reference to an improved manufacture of metallic
plates with thickened, enlarged or embossed parts produced in manner and by
means hereinafter described, to receive stay bolts, for example, as set forth in my
specification N° 6625 A.D. 1885.
In the manufacture of such plates according to my present invention, two
punches are used in conjunction with a die, the arrangement being such that the
plate operated upon is pressed or squeezed between two punches so as to form at
each side thereof, a hole, these two holes having a common axial line, and the
displaced metal being forced into the die which surrounds the one punch.
I will for the sake of clearness call one punch A, the other B. The punch A, is
of the diameter of the required hole and the end of the punch as I prefer to make
it, is flat or nearly so. The punch B, has a slightly rounded or mitred end and is
fixed in the centre of the die, which is a cupped die of a form corresponding to the
required form of embossment, the face of this cupped die being approximately
level with or slightly below the end of the punch B, so that the die and punch
form an annular die.
These instruments are fixed in a suitable press with the punches strictly
concentric with each other, that is to say, in a common axial line. The plate to be
operated upon is placed between the above named punches and pressure is applied
thereto in such manner that the metallic plate is pressed between and is penetrated
at its respective sides by the two punches and the displaced material is caused to
flow into the annular die, thus effecting the embossing or thickening of the
metallic plate.
Any film or portion of metal remaining between the two punches on completion
of the just described embossing operation may be afterwards removed by ordinary
punching or drilling, or the punch B, may be made to recede within the die by
a superior pressure of the punch A, after the embossment has been substantially
A

page_text: formed and thus be caused to clear the hole from the film or portion of metal left
between the two punches.
The punch A, may be of a diameter corresponding to the required diameter of
the hole for a part of its length equal to the thickness of the plate to be treated,
this portion of the punch being succeeded by a non-penetrating portion of larger
diameter, or the punch carrier may be so arranged as to press upon the plate
around the embossed hole and thus flatten the plate around the embossment and
also at its opposite side, and the punch B, after the required embossment has been
formed by the squeezing action of the punches and dies.
According to a modification, a hole is drilled at the part to be embossed, and as
I prefer is countersunk at its edges so as to avoid distress to the metal by having
to remove sharp angles of the drilled hole, (which parts would be liable to fracture
on being bent towards the embossing die) a tapered punch of the required diameter
is applied to the hole and by pressure the lower edge of the metal around the hole
in the plate is forced towards and against the bottom of the cupped die thus
fullering or pressing it to the shape of the cupped die and producing the required
embossment. The hole in the plate is carefully made to size or proportioned so
that the punch shall not carry any of the metal into the hole that extends through
the cupped die. Care should be taken that the hole in the plate be not too large,
otherwise the boss will be smaller or wanting in proportion, and on the other hand,
if it be too small the punch will carry away some of the material into the hole
that extends through the cupped die and will wedge itself therein. The punches
and dies are made in suchwise that they may be applied either singly or otherwise
so as to produce either one or a series of holes and embossments at one operation.
DOLL
TOOK

page_text: .
Enlarged, or Embossed Parts to Receive Stay Bolts..
I, ROBERT ANTHONY HARDCASTLE of 30, Hyde Terrace, Leeds, in the County of
York, 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 present invention has reference to an improved manufacture of metallic plates
with thickened, enlarged or embossed parts produced in manner and by means
hereinafter described, to receive staybolts, for example, as set forth in my
Specification No 6625, A.D. 1885.
In the manufacture of such plates according to my present invention, two
punches are used in conjunction with a die, the arrangement being such that the
plate operated upon is pressed or squeezed between the two punches so as to form
a bole at each side thereof, these two holes having a common axial line, and the
displaced metal being forced into the die, which surrounds one of the punches.
These punches, as shewn in the annexed drawings are marked a, and b,
respectively in Figs. 1, 2.
The punch.a, is of the diameter of the required hole, and the end of this punch,
as I prefer to make it, is flat or nearly so.
The punch 6, has a slightly rounded or mitred end and may be fixed in the
centre of the die o, as shewn in section Fig. 1, but I prefer to make the punch b,
and die o, in one piece as shown in section Fig. 2.-The die o is cupped to a form
corresponding to the required form of embosament, the face of this cupped die being
approximately level with or slightly below, or occupying a backward position
in relation to the end of the punch b. The die c, and the punch b, form an
annular die.
These instruments are fixed in a suitably constructed hydraulic or other press,
with the punches strictly concentric with each other, that is to say;-in a common
axial line-The plate d, to be operated upon is placed between the abovenamed
punches to which pressure is applied in such manner that the metallic plate is
pressed between and is penetrated at its respective sides by the two punches, as
shown in section in Fig. 3, and the displaced material is caused to flow into the
annular die c, thus effecting the embossing and thickening of the metallic plate.
Any film or portion of metal such as d³, remaining between the two punches on
completion of the just described embossing operation may be afterwards removed
by ordinary punching or drilling, or the punch b, may be constructed as shewn in
Fig. 3, and be loaded or otherwise caused to penetrate the plate under treatment,
and to afterwards recede within the die c, by superior pressure applied to the
punch a, after the embossment has been substantially formed;-In this case the
punch a, is constructed and arranged to have a separate and additional forward
movement within its carrier a², for the purpose of clearing the hole of the film or
portion of metal d', between the two punches as shewn in the section of the plate d,
Fig. 3. Fig. 4, shews the plate d, with the film d, removed or punched out also.
position of the two punches a, and b, after this has been effected,
8

page_text: The punch a, Fig. 1, may be of a diameter corresponding to the required.
diameter of the hole for a part of its length, say equal or nearly so to the thickness
of the plate to be treated or to the depth of its intended penetration, this portion of
the punch being succeeded by a non-penetrating portion a', of larger diameter, or
the punch carrier a³, may be so arranged as to press against the plate around the
embossed hole and thus flatten the plate around it after the embossment at its
opposite side has been formed by the squeezing action of the punches and the
annular cupped die.
According to a modification shewn in Fig. 5, a hole d³, is drilled at the part of
the plate to be embossed and by preference is countersunk at its edge or edges so
as to avoid distress to the metal by having to remove the sharp angles of the drilled
hole, (which parts would be liable to fracture on being bent towards the embossing
die). A tapered punch a³, of the required diameter is applied to the hole and by
pressure the lower edge of the metal around the hole in the plate is forced towards
and into the cupped die c, thus fullering or pressing it into and to the shape of the 1
cupped die and producing the required embossment as shewn in Fig. 6.
Fig. 7, is a detached section of the plate d, after being embossed as just described.
The hole d', in the plate is carefully made to size or proportioned so that the punch
shall not carry any of the metal into the hole that extends through the cupped die.
Care should be taken that the hole in the plate be not too large, otherwise the boss
will be smaller or wanting in proportion, and on the other hand, if it be too small
the punch will carry away some of the material into the hole that extends through
the cupped die c¹, and will wedge itself therein.
The punches and dies are made in such manner that they may be applied either
singly or otherwise so as to produce either one or a series of holes and embossments
at one operation.
374
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1 The use in thickening enlarging or embossing parts of plates as herein s
described of two punches and an annular die or matrix surrounding one of them
whether the punch surrounded by the die or matrix be made in one therewith or
as a separate piece substantially as described and illustrated respectively in Figs. 1,
and 2, of the drawings annexed.
2 The use for the purpose mentioned in the preceding claim of apparatus such 3
as hereinbefore described with reference to Figs. 3. and 4. of the drawings.
Dated this 3rd day of July 1886.
Witness
THƠ E. CRAVEN, CE
Fel. Inst. Patent Agents,
ROBERT ANTHONY HARDCASTLE.
24, Victoria Chambers, Leeds.