Improved Method of Perforating Solid Metal Blocks.
Year: 1899

page_text: Date of Application, 24th Oct., 1899
Complete Specification Left, 18th July, 1900-Accepted, 6th Oct., 1900
[Communicated from abroad by THE HERNADTHALER UNGARISCHE EISENIN-
DUSTRIE ACTIEN GESELLSCHAFT, of 8, Operngasse, Budapest, Hungary.]
Improved Method of Perforating Solid Metal Blocks.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
The object of the present invention is a punching apparatus in which without
using a matrix the presser, bar acts against a fixed swage so that the material to
be punched is thrust over the swage.
In this device, which is illustrated in the accompanying drawing, the
block of metal a is placed in a cylinder b, serving merely as its
guide. A swage c is fixed in front of the cylinder and placed axially with regard
to the latter. The metal block a is forced against the swage by means of a
presser d operating at the back of the metal block and guided in the cylinder b.
The swage, meeting the metal block, forces itself into the metal thus expanding
the metal in such a way that finally the solid block of metal a is transtormed
into a tube e (Figure 2) having a cylindrical hole, which tube envelops the
swage, without the use of a matrix in the usual manner to limit the sideways
motion of the metal or influence its outer form. It is preferable when the blocks
are worked hot, in order to prevent them cooling too quickly or unequally to
surround the swage with a cover f which prevents the access of air to the metal,
but this cover does not operate to give form. The tube e is then drawn off the
punch c and subjected to further operations as required.
The present invention is distinguished from others hitherto in use by great
simplicity in working and arrangement and ensures a symmetrical perforation of
the metal.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
[Price 8d.]

page_text: Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil 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 follow-
ing statement:-
The object of the present invention is a punching apparatus in which without
using a matrix the presser bar acts against a fixed swage so that the material to
be punched is thrust over the swage.
In this device which is illustrated in the drawing accompanying the Provisional
Specification, the block of metal a is placed in a cylinder b, serving merely as its
guide. A swage c is fixed in front of the cylinder and placed axially with regard
to the latter. The metal block a is forced against the swage by means of a
presser d operating at the back of the metal block and guided in the cylinder b.
The swage, meeting the metal block, forces itself into the metal thus expanding
the metal in such a way that finally the solid block of metal a is transformed
into a tube e (Figure 2) having a cylindrical hole, which tube envelops the
swage, without the use of a matrix in the usual manner to limit the sideways
motion of the metal or influence its outer form. It is preferable. when the blocks
are worked hot, in order to prevent them cooling too quickly or unequally to
surround the swage with a cover f which prevents the access of air to the metal,
but this cover does not operate to give form. The tube e is then drawn off the
punch c and subjected to further operations as required.
When the metal is worked cold the cover of may be dispensed with but is pre-
ferably retained. The part of the cover adjacent to the guide c for the metal
block and the piston d operates merely as a guide for the metal, and if the cover
is dispensed with this does not in any way interfere with the punching as in the
last stages of punching when the piston d is nearly driven home the mandrel c
reliably supports and guides the metal block.
The present invention is distinguished from others hitherto in use by great
simplicity in working and arrangement and ensures a symmetrical perforation of
the metal.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, as communicated
to me by my foreign correspondents, I declare that what I claim is:-
The improved process for perforating solid blocks without the use of a matrix
consisting in forcing said blocks through a cylinder against a concentrically placed
swage in such a way that the block is forced over the swage and can be with-
drawn when perforated substantially as described.
Dated the 10t
T1
1000
: