An Improvement in Electro-magnets.
Year: 1899

page_text: An Improvement in Electro-magnets.
I, ADRIEN LOUIS AUGUSTIN CHARLES D'ARLINCOURT, of 39, Rue de Berri, Paris
France, Student, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improvement in electro-magnets and consists essen-
tially in such construction of the armature as to permit of a much greater extent of
movement being obtained than is possible with the ordinary form of armature and
the same intensity of current.
My invention consists essentially in dividing the armature into several members in
planes parallel to the lines of force, these members being disposed at successively
increasing distances from the electro-magnet cores, the arrangement being such that
the members will be successively attracted and each will carry along with it the next
in succession so that the members at too great a distance to be directly attracted are
thus brought within range. The electro-magnet cores may each be made in one
piece or be divided into as many elements as there are members in the armature for
the purpose of obtaining a more uniform attraction of the different members consti-
tuting the armature.
My improvements are illustrated by way of example in the accompanying drawings
in which
Figures 2 and 3 respectively shew a face view, plan, and side view of the electro-
magnet.
Figure 4 shews a side view of a modification in which the electro-magnet cores are
divided into as many elements as there are members in the armature.
The same letters of reference denote like parts in all the figures.
The armature of the electro-magnet comprises five strips or members a¹, a², a³, as, a³,
pivoted respectively upon axes 61, 62, 63, 64, 65, the members being disposed one above
the other at different distances from the cores c of the electro-magnet so that the
attractive force will only be exerted upon a single element at a time. The armature
members a¹ to at each carry an adjustable abutment d¹, d2, d³, d, the abutment
carried by each member serving to cause said member to carry along with it the
member next in succession. These abutinents may for example consist of set screws
mounted in brackets affixed to the armature members or may be otherwise con-
structed.
The action of the electro-magnet is as follows. Supposing the extremity of the
member a nearest to the cores c to be at a distance of 3 millimetres therefrom, that
of a² at a distance of 6 millimetres, that of a³ at a distance of 9 millimetres, and so
on and that for a given current intensity the attractive force of the electro-magnet
On the current passing through
cannot be exerted beyond a range of 3 millimetres.
the electro-magnet the member a being attracted is moved up to the cores c and by
means of the abutment carries along with it in this movement the member a
which in turn carries along it with the member a³, the member a³ similarly carrying
with it the member at, and the member a carrying with it the member a5. In this
way the member a² will be brought up to a distance of 3 millimetres from the core c,
the member as to a distance of 6 millimetres therefrom, and in short all the members
will be advanced towards the cores to the extent of 3 millimetres. The member a²
being thus brought within range is now attracted in turn against the cores c of the

page_text: electro-magnet and carries with it the member a³, the remaining members being
again advanced to the extent of 3 millimetres, the members being thus brought
successively within range until the last member as is directly attracted by the electro-
magnet, these several attractions being effected in such rapid succession that the
entire armature appears to move as one piece.
By this construction a much greater extent of movement of the armature is obtain-
able than is usually possible, as in the example described the stroke of the armature
is increased from 3 to 15 millimetres, but it is to be understood that these distances
are only cited as examples by way of illustration and that the number and dimen-
sions of the members of which the armature is composed may be varied according
to the power of the electro-magnet and the extent of the movement desired.
In order to obtain a more uniform attraction of the different members of the arma-
ture, the cores c may be divided into as many parts as there are members in said
armature, as shewn in Figure 4.
My improvement, by reason of the large extent of movement of the armature
obtainable and the low intensity of current required, is susceptible of numerous appli-
cations and is capable of being adapted to all kinds of electro-magnets either for
obtaining an angular motion of the armature, as in the example given, or a parallel
movement of translation of the armature.
Dated this 18th day of April 1800
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
I, ADRIEN LOUIS AUGUSTIN CHARLES D'ARLINCOURT, of 39, Rue de Berri, Paris,
France, Student, 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 an improvement in electro-magnets and consists
essentially in such a construction of the armature as to permit of a much greater
extent of movement being obtained than is possible with the ordinary form of
armature and the same intensity of current.
My invention consists essentially in dividing the armature into several members in
planes parallel to the lines of force, these members being disposed at successively
increasing distances from the electro-magnet cores, the arrangement being such that
the members will be successively attracted and each will carry along with it the next
in succession so that the members at too great a distance to be directly attracted are
thus brought within range. The electro-magnet cores may each be made in one
piece or be divided into as many elements as there are members in the armature for
the purpose of obtaining a more uniform attraction of the different members
constituting the armature.
My improvements are illustrated by way of example in the drawings accompanying
my Provisional Specification in which Figures 1, 2 and 3 respectively shew a face
view, plan, and side view of the electro-magnet. Figure 4 shews a side view of a
modification in which the electro-magnet cores are divided into as many elements as
there are members in the armature. The same letters of reference denote like parts
in all the figures.
The armature of the electro-magnet comprises five strips or members a¹, a², a³, a³, a³,
pivoted respectively upon axes 61, 62, 63, 64, 65, the members being disposed one above
the other at different distances from the cores c of the electro-magnet so that the
attractive force will only be exerted upon a single element at a time. The armature

page_text: members a¹ and at each carry an adjustable abutment, d², d³, d, the abutment
carried by each member serving to cause said member to carry along with it the
member next in succession. These abutments may for example consist of set
screws mounted in brackets affixed to the armature members or may be otherwise
constructed.
The action of the electro-magnet is as follows:-Supposing the extremity of the
member a nearest to the cores c to be at a distance of 3 millimetres therefrom, that
of a2 at a distance of 6 millimetres, that of a³ at a distance of 9 millimetres, and
so on and that for a given current intensity the attractive force of the electro-
magnet cannot be exerted beyond a range of 3 millimetres. On the current passing
through the electro-magnet the member at being attracted is moved up to the cores c
and by means of the abutment d¹ carries along with it in this inovement the
member a which in turn by means of abutment de carries along with it the
member a³, the member a³ similarly carrying with it the member a with the aid
of abutment d³, and the member at carrying with it the member as by means of
abutinent d'. In this way the member a² will be brought up to a distance of
3 millimetres from the core c, the member a³ to a distance of 6 millimetres there-
from, and in short all the members will be advanced towards the cores to the extent
of 3 millimetres. The member a² being thus brought within range is now attracted
in turn against the cores c of the electro-magnet and carries with it the member a³,
the remaining members being again advanced to the extent of 3 millimetres, the
members being thus brought successively within range until the last member a³ is
directly attracted by the electro-magnet, these several attractions being effected in
such rapid succession that the entire armature appears to move as one piece.
By this construction a much greater extent of movement of the armature is
obtainable than is usually possible, as in the example described the stroke of the
armature is increased from 3 to 15 millimetres, but it is to be understood that these
distances are only cited as examples by way of illustration and that the number and
dimensions of the members of which the armature is composed may be varied
according to the power of the electro-magnet and the extent of the movement
desired.
In order to obtain a more uniform attraction of the different members of the
armature, the cores c may be divided into as many parts as there are members in said
armature, as shewn in Figure 4.
My improvement by reason of the large extent of movement of the armature
obtainable and the low intensity of current required, is susceptible of numerous
applications and is capable of being adapted to all kinds of electro-magnets either
for obtaining an angular motion of the armature, as in the example given, or a
parallel movement of translation of the armature.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. An electro-magnet provided with an armature divided in planes parallel to
the lines of force, into several members disposed at successively increasing
distances from the electro-magnet cores, and provided with means whereby each
member as it is successively attracted will carry along with it the next member so
that those members which are too distant to be directly attracted will be brought into
range substantially as herein before specified.
2. An electro-magnet provided with an armature of the kind specified and having
its cores divided into as many portions as there are members of the armature as and
for the purpose specified.
T