An Improvement in Bobbins for Dynamo Electric Machines.
Year: 1891

page_text: Date of Application, 8th Sept., 1891
Complete Specification Lelt, 9th May, 1892-Accepted, 18th June,
1892
PROVISIONAL SPECIFICATION.
An Improvement in Bobbins for Dynamo Electric Machines.
We SIEMENS BROTHERS & Co. LIMITED of 12 Queen Annes Gate, West-
minster, in the County of Middlesex, and FRANCIS HIRD of 2 Mount Terrace,
Charlton in the County of Kent, Electrical Engineers, do hereby declare the
nature of this invention to be as follows :—
This invention relates to a construction of bobbins for dynamo electric machines,
more particularly those which are of the alternating current kind, such, for instance,
as are described in the Specification No. 3134 of 1878.
The object of the invention is to obtain means of securely fixing such bobbins to
the rapidly revolving armatures which carry them, without the use of metallic
cores, or of any considerable body of metal in that part of the core which has to
pass through the magnetic fields of the machine.
Fig. 1 of the accompanying drawings is a front view and Fig. 2 is an edge view
of a bobbin, constructed according to the present invention, of a form suitable for
one of the well known types of alternate current machines described in the
Specification above referred to. A, the main body of the core, is made of hard
wood which may be saturated with paraffin. At its end, beyond that part of it
which passes through the magnetic fields, is a piece B of gun metal or other strong
non magnetic metal, fixed to the wooden core by a strap S of steel or other suitable
metal, which is of width equivalent to the thickness of the core and, while under
tension, is fixed to the core A and piece B by screws. At the upper end of the
core, a space T is left between the two ends of the strap S. On the core thus
formed the coil C of wire or strip is wound, and, if desired, the winding may be
secured sideways by cheeks indicated by the dotted lines D. Through the metal
piece B are passed the bolts by which the bobbin is fixed on the armature.
Although the drawings represent a form of bobbin suitable for a particular
machine, it is to be understood that a similar construction is applicable to bobbins
of like type though differing in form.
Dated this 8th day of September 1891.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
An Improvement in Bobbins for Dynamo Electric Machines.
We, SIEMENS BROTHERS & Co. LIMITED, of 12 Queen Annes Gate, West-
minster, in the County of Middlesex, and FRANCIS HIRD, of 2 Mount Terrace,
Charlton, in the County of Kent, 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:—
This invention relates to a construction of bobbins for dynamo electric machines,
more particularly those which are of the alternating current kind, such, for instance,
as are described in the Specification No. 3134* of 1878.
The object of the invention is to obtain means of securely fixing such bobbins to
the rapidly revolving armatures which carry them, without the use of metallic
cores, or of any considerable body of metal in that part of the core which has to
pass through the magnetic fields of the machine.
Fig. 1 of the drawings, accompanying the Provisional Specification is a front
view and Fig. 2 is an edge view of a bobbin, constructed according to the present
Pine 87

page_text: invention, of a form suitable for one of the well known types of alternate current
machines described in the Specification above referred to.
A, the main body of the core, is made of hard wood which may be saturated
with paraffin. At its end, beyond that part of it which passes through the magnetic
fields is a piece B of gun metal or other strong non-magnetic metal, fixed to the
wooden core by a strap S of steel or other suitable metal, which is of width
equivalent to the thickness of the core and, while under tension, is fixed to the
core A and piece B by screws.
At the upper end of the core, a space T is left between the two ends of the
strap S. On the core thus formed the coil C of wire or strip is wound, and, if
desired, the winding may be secured sideways by cheeks indicated by the dotted
lines D. Through the metal piece B are passed the bolts by which the bobbin is
fixed on the armature.
Although the drawings represent a form of bobbin suitable for a particular
machine, it is to be understood that a similar construction is applicable to bobbins
of like type though differing in form.
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:—
A bobbin for a dynamo electric machine having for its core a wooden body, with a
metallic piece for fixing it to the armature, attached to the wood by a strap screwed
to the edge of the core, substantially as described.
Dated this 9th day of May 1899