Year: 1887

page_text: месцас.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E. 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
This invention relates to mechanism for making metal articles, spherical, cylindrical
or other contour having circular cross sectional area.
Referring to the accompanying drawings:
Figure 1 is a perspective view of the front end of a machine embodying this
invertion.
Fig. 2 is a plan view of the die supporting platens the dotted lines indicate the
position which the dies are to occupy when placed in position upon the platens.
Fig. 3 is a plan view of one die.
To facilitate the proper understanding of this invention it should be observed that
the dies are intended to be used in pairs and moved in opposite directions to compress
and shape the articles of metal or other suitable material rolled on their axis between
them and it is partly the object of this invention to prevent the article from slipping or
sliding out of position between the dies while being crowded and compressed into
shape.
The platens A are mounted upon suitable brackets B which brackets are attached to
It is
the framework of the machine as represented in figure 1 of the drawings.
desirable to have the platens adjustable toward and from each other to permit dies of
This desired adjustment
different thickness to be introduced into the same machine.

page_text: of the platens is accomplished in the machine represented by making the bracket which
supports the platen movable on its supporting and staying pins but it will be evident
that other constructions and forms of mechanism may be employed as well.
The
platens are located one above the other and are pivotally connected to their supporting
brackets by suitable pins or studs on which they may be turned or oscillated
sufficiently to carry the forming dies past each other in opposite directions. In the
machine represented a rack and pinion mechanism is made use of the construction,
arrangement and operation of which is deemed obvious from the drawings, for giving
movement to the platens but other mechanisms may be employed as well, the essential
feature being to move the dies in opposite directions, simultaneously and with equal
speed.
The curvilinear face 6 of the die commences at the vanishing point a and gradually
deepens until it terminates at the opposite end of the die on line e. This is the forming
surface of the die. It commences its work at the point a and ends it at the line e.
The maximum depth of the surface bon line e is about equal to one half the largest
diamater of the article which it is intended to make between the two (2) dies, and the
general conformation or contour of this surface line e will correspond with the lateral
contour of the completed article as it appears on the plane which bisects the article.
The spreading and reducing surface hh, commencing at the point a rise gradually
from the surface of the die block until they terminate at the line e at which point they
are elevated to one half the diameter of the intended articles. The dies which are
preferably composed of steel are made by first planing or milling in the grooves which
constitute the forming surface e and then cross planing the raised surfaces to a
vanishing point as stated. The outer or spreading surfaces are preferably rounded
and corrugated or chased to the end that they may better lay hold of the metal bar and
rotate it while the article is being formed.
The curvature of either die is made similar to the curvature of its cooperative
member and the dies are positioned upon their respective platens so that their forming
faces overlap each other and their corresponding cross sectional faces register with
each other in a plane that bisects the platen pivotal pins. On either side of this plane
the forming surfaces diverge according to the lateral curvature of the dies and are
therefor ron-registrant. In the machine represented the registering line is intermediate
the pivotal bearings of the platens and as the dies move past each other in opposite
directions the forming surfaces converge as they approach and diverge as they depart
from the registering plane. In operation the platens are first moved so as to bring
the vanishing point of each die into the registering plane. The metal bar is then
placed in position between the dies and the platens begin to move in opposite directions
as indicated.
The dies lay hold upon opposite sides of the metal bar and in moving past each
other compress reduce and shape the intended article which article drops from the metal
bar a completed thing when the dies complete their passage. It is always in the
registrative plane that shape and form are imparted to the intended article and the
lateral divergment of the forming surfaces of the dies immediately before and after the
registering plane prevents the article from slipping and sliding out of position while
being formed.
The dies represented in the drawings are sections of arcs of similar
circles and are mounted upon platens which turn about fixed axis and my
correspondent is persuaded to believe that such is the simplest and most economical
mechanism and arrangement to be employed in carrying out this invention though he
is aware that other mechanisms could be devised for operating the dies and carrying
them through the required paths or movements and effect the result desired.
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondent and in what manner the same is
to be performed I declare that what I claim is :-
1. In a machine for making metal articles as described the combination or
employment of curved dies mounted on platens and working in curved paths,
substantially as set forth.

page_text: 2. Curved dies substantially as described.
3. Two (2) dies having forming surfaces substantially as set forth the dies being
arranged with their forming surface opposed and registering with each other in a cross
sectional plane and divergment and non-registering on both sides of said plane combined
with mechanisms for moving the dies in opposite directions and bringing the successive
cross sectional surfaces of the dies into the registering plane simultaneously
substantially as and for the purposes described.
4. The combination of the curved dies their supporting platens and the described
rack and pinion mechanisms for moving the dies substantially as described.
Dated this 2nd day of August 1887.