Improvements in Springs for Electrical Conductors.
Year: 1895

page_text: Date of Application, 22nd Mar., 1895--Accepted, 27th Apr.. 1895
[Communicated from abroad by Messrs. SIEMENS & HALSKE, of Berlin, in the
German Empire, Electrical Engineers.]
Improvements in Springs for Electrical Conductors.
We, SIEMENS BROS. & Co. LIMITED, of 12 Queen Anne's Gate, Westminster,
in the County of Middlesex, Electrical Engineers, 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 :-
Hitherto blade and spiral springs have been employed for flexibly connecting
two parts of an electrical conductor.
The blade spring, unless it be made of great length, can only be applied in cases
where the two connected parts have a small amount of motion relatively to each
other.
When it is attempted to obtain the requisite elasticity of the spring by reducing
its cross sectional area, there is great risk of producing irregular bends and kinks
by excessive bending. Moreover such a reduction of the cross sectional area is
not always permissible when the spring has also to conduct an electric current.
When, instead of a blade spring, an ordinary spiral spring is employed, it is
necessary to connect that end of the spring which is situated at the centre of the
spiral to a pin or stud fixed laterally to one of the two parts which are connected
together. But the space necessary for this purpose is not always available, as for
instance in applying the spring to the brush holders of dynamo machines, when it
is required to have a row of such brushes as close together as possible, so as to
cover the whole width of the commutator. Moreover a spring of this kind is not
suitable for conducting current, because it is more or less loose on the pin or stud
not making good contact.
For this reason the current must be conducted by means of a soft copper strip,
copper wire, or strand, whereby the connection loses a great portion of its flexibility.
The same drawback occurs when a spiral spring coiled in cylindrical form is
employed. The spiral spring forming the subject of this invention is free from
these defects; it is wound double from the centre, presenting both ends at the
periphery of the spiral. This spring combines the advantage of secure metallic
connection between the two connected parts which is given by the ordinary blade
spring, with the advantage of the great flexibility which is a feature of the spiral
spring. This new spring is therefore suitable for use in all cases in which two
parts that serve to conduct an electric current are required to be connected together
in a flexible and conductive manner.
Figs. 1 and 2 of the accompanying drawings illustrate an ordinary spiral spring
and its attachment to a lateral pin or stud.
Figs. 3 and 4 shew the construction of the new spiral spring.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:-
For electrically connecting two metallic parts, a spiral spring consisting of a
metallic strip coiled double from the centre, so that both ends of the coil are

page_text: presented et the periphery of the Spiral, substantially as and for the purpose set
forth.
Dated this 22nd day of March 1895.
79149
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