Method of and Means for Manufacturing Toothed Wheels, Spoke or Diso Wheels, and similar Articles of Wrought Iron or Steel,
Year: 1898

page_text: Date of Application, 28th Dec., 188
Complete Specification Left, 18th Sept., 1899-Accepted, 4th Nov.,
1899
PROVISIONAL SPECIFICATION.
Method of and Means for Manufacturing Toothed Wheels, Spoke or
Diso Wheels, and similar Articles of Wrought Iron or Steel,
I, HEINRICH EHRHARDT, of 20, Reichstrasse, Dusseldorf, Germany, Civil
Engineer, do hereby declare the nature of this invention to be as follows.-
My invention relates to an improved method of manufacturing toothed wheels,
spoke or disc wheels and similar articles which I will describe with reference to
the accompanying drawings.
In carrying out my invention I first prepare a blank such as of the form shewn
at a Fig. 3, which is then subjected to pressure in a mould by means of a
divided die of the construction shewn in vertical section and plan at Figs. 1 and 2
The mould has the configuration of the finished article, while the die d 18
divided into separate sectors which can be moved in a radial direction like the
claws of a universal lathe chuck On first operating on the blank the sectors
are situated close together as shewn, so that the die can then form the nave of
the wheel and make the part of the disc surrounding the nave of the requisite
thickness. By this operation the blank will become considerably enlarged in
diameter and will assume the shape shewn in the cross section at Fig. 4.
Simultaneously with this operation, the central hole may be formed in the nave
by means of a die P¹ Fig 1, forced up from below
The farther expansion of the partly formed article is then effected by the
expanding die in such manner that before each pressing operation the die sectors
are moved a certain distance apart, whereby the article is gradually expanded
and made to assume the desired shape
At the same time, after each pressing either the matrix or mould together
with the article, or the die has a slight partial rotation imparted to it, in order
that the wheel may be subject to a uniform pressing action over its whole sur-
face, which 18 thus rendered uniform and smooth.
The outward movement of the die sectors can be effected either by hand or
automatically either by means of screw spindles as at s, s, Figs 1 and 2, or by
a spiral cam groove, or by inclines or excentrics, this being effected either in
combination with the rotating motion or independently thereof.
When pressing spoke wheels, the operation is the same as above described,
the matrix or mould being formed with recesses or grooves corresponding to the
spokes, into which the metal of the article is gradually forced by the successive
pressures of the die
After the first pressure, when the die sectors are closed
together and form the nave and the contiguous parts of the spokes, the sectors
are moved gradually more and more apart before each succeeding pressure, by
which means the material in being gradually expanded 18 at the same time
pressed into the grooves for the spokes and the rim."
Figs 1, 2 and 5 shew the construction of wheels with disc centres, the radial
movement of the die sectors 18 in this case effected by means of sciew
spindless which are simultaneously rotated by means of a toothed ring and
nmions.

page_text: Figs 1 and 2 shew the first pressing operation with closed up die sectors, and
Fig. 5 shews the die sectors in their extreme outward position, shewing the
finished wheel
Figs 6 and 7 shew a simular arrangement for forming a spoke wheel.
Figs. 8 and 9 shew a vertical section and plan of an arrangement in which the
grooves or recesses for the spokes are formed in the die sectors d
In this case the expanded wheel has to be subjected to a second pressure by
means of another die, as with this construction the parts cannot be turned round
in the manner above described while operating with the die d
It will be obvious that articles of any desued configuration besides the circulai
form can be subjected to the above described process.
Dated this 28th day of December 1898.
ABEL & IMRAY,
Agents for the Applicant
Method of and Means for Manufacturing Toothed Wheels, Spoke or
Disc Wheels, and suınılar Articles of Wrought Iron or Steel,
I, HEINRICH EHRHARDT, of 20, Reichstrasse, Dusseldorf, Germany, Civil
Engineer, do hereby declare the nature of this invention and in what manner the
same 18 to be performed, to be particularly described and ascertained in and by
the following statement:-
My invention relates to an improved method of manufacturing toothed wheels,
spoke or disc wheels and similar articles which I will describe with reference to
the drawings accompanying my Piovisional Specification.
In carrying out my invention I first prepare a blank such as of the form shewn
at a Fig 3, which is then subjected to pressure in a mould by means of a
divided die of the construction shewn in vertical section and plan at Figs 1 and 2.
The mould has the configuration of the finished article, while the die d is
divided into separate sectors which can be moved in a radial direction like the
claws of a universal lathe chuck On fist operating on the blank the sectors
are situated close together as shewn, so that the die can then form the nave of
the wheel and make the part of the disc surrounding the nave of the requisite
thickness. By this operation the blank will become considerably enlarged in
diameter and will assume the shape shewn in the cross section a' at Fig 4.
Simultaneously with this operation, the cential hole may be formed in the nave
by means of a die P₁ Fig 1, forced up from below. The farther expansion of
the partly formed article is then effected by the expanding die in such manneı
that before each pressing operation the die sectors are moved a certain distance
apart, whereby the article 18 gradually expanded and made to assume the desired
shape.
At the same time, after each pressing either the matrix or mould together
with the article, or the die has a slight partial rotation imparted to it, in order
that the wheel may he subject to a uniform pressing action over its whole sur-
face, which is thus rendered uniform and smooth.
The outward movement of the die sectors can be effected either by hand or
automatically either by means of screw spindles as at s, Figs 1 and 2, or by
a spiral cam groove, or by inclines or excentrics, this being effected either in
combination with the rotating motion or independently thereof
When pressing spoke wheels, the operation is the same as above described,
the matrix or mould being formed with recesses or grooves corresponding to the

page_text: spokes, into which the metal of the article is gradually forced by the successive
pressures of the die. After the fist piessure, when the die sectors are closed
together and form the nave and the contiguous parts of the spokes, the sectors
are moved gradually more and more apart before each succeeding pressure, by
which means the material in being gradually expanded 18 at the same time
pressed into the grooves for the spokes and the rim.
Figs. 1, 2 and 5 shew the construction of wheels with disc centres, the radial
movement of the die sectors
18 in this case effected by means of screw
spindless which are simultaneously rotated by means of a toothed ing and
pinions
Figs. 1 and 2 shew the first pressing operation with closed up die sectors and
Fig 5 shews the die sectors in then extreme outward position, shewing the
finished wheel.
Figs 6 and 7 shew a similar arrangement for forming a spoke wheel
Figs. 8 and 9 shew a vertical section and plan of an airangement in which the
grooves or recesses for the spokes are formed in the die sectors d
In this case the expanded wheel has to be subjected to a second pressure by
means of another die, as with this construction the parts cannot be tuined round
in the manner above described while operating with the die d
It will be obvious that articles of any desued configuration besides the circular
form can be subjected to the above described process
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is.—
1 Method of manufacturing toothed wheels, spoke or disc wheels and similar
articles of cucular, rectangular or other form, by means of a pressing die which
can be contracted or expanded either by hand or other wise in a similar manner
to the universal chuck of a lathe, which expanding die is made to operate upon
a block of metal in a mould in such manner, that the said die is first made to act
upon the block of metal in the contracted position so as to effect the preliminary
nioulding thereof, after which the die is gradually expanded during successive
pressing operations so as to gradually expand the moulded object until it has
assumed the complete configuration of the mould, substantially as described
2. The construction of moulding machines with expanding pressing dies
arianged and operating as heiem described with reference to the diawings
Dated this 18th day of September 1899.