Year: 1894

page_text: Date of Application, 3rd Jan., 1894
Complete Specification Left, 2nd Oct., 1894-Accepted, 29th Dec., 1894
I, NATHANIEL SHEPARD KEITH, of 711 Jones Street, in the City and County
of San Francisco, State of California, United States of America, Electrical
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to a method of constructing the frames and field magnets
of dynamos.
The bed plate preferably consists of a hollow casting to which are bolted two or
more standards carrying the bearings of the armature shaft.
The field magnets consist of a number of laminæ of iron insulated from each
other and held between two thick end plates of iron bolted to the bed plate
between the standards.
The end plates and laminæ are of similar shape each consisting of a circular
or polygonal plate with a central hole to receive the armature and having four or
other number of internal projections forming the pole pieces. The projections
however of the end plates are not of the full thickness of the plate and are not
rectangular in cross section for whilst one face is flat and lies in the same plane as
the face of the plate the other face is rounded and lies within the two sides of the
plate.
The coils forming the winding of the pole pieces surround the projections both
of the lamina and of the end plates the rounded surfaces of the latter obviating
the necessity of there being any sharp bends at the ends of the coils.
At the bases of the more or less triangular spaces between the coils lugs project
from the end plates so that the latter can be connected by bolts passing through
the lugs which bolts do not touch the laminæ or coils; in this manner the lamina
and their projecting poles are very firmly held together and to the bed plate.
Dated this 3rd day of January 1894.
I, NATHANIEL SHEPARD KEITH, of 711 Jones Street, in the City and County
of San Francisco, State of California, United States of America, Electrical
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
following statement :-
This invention relates to a method of constructing the frames and field magnets
of dynamos.
Figure 1 is a side elevation of a dynamo constructed according to this invention
Figure 2 is a front elevation of one of the lamina.
Figure 3 is a front elevation of one of the end plates, and
Figure 4 is a section of the same to a larger scale.

page_text: The bed plate a preferably consists of a hollow casting to which are bolted two
or more standards 66 carrying the bearings of the armature shaft c.
The field magnets consist of a number of laminæ d of iron insulated from each
other and held between two thick end plates of iron bolted to the bed plate
between the standards.
The end plates e and laminæ d are of similar shape each consisting of a circular
or polygonal plate with a central hole to receive the armature and having four or
other number of internal projections d'e' forming the pole pieces. The projections e¹
however of the end plates are not of the full thickness of the plate and are not
rectangular in cross section for whilst one face is flat and lies in the same plane as
the face of the plate the other face is rounded and lies within the two sides of the
plate as is clearly shown at Figure 4.
The coils (not shown in the drawings) forming the winding of the pole pieces
surround the projections d' of the lamina d and el of the end plates e the rounded
surfaces of the latter obviating the necessity of there being any sharp bends at
the ends of the coils.
At the bases of the more or less triangular spaces between the coils, lugs f
project from the end plates e so that the latter can be connected by bolts g
(Figure 4) passing through the lugs which bolts do not touch the lamina or coils;
in this manner the lamina and their projecting poles are very firmly held together
and to the bed plate.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
:―
1. Connecting the end plates by means of bolts in the spaces between the coils
substantially as described.
2. Making the coils surround projections on the end plates as well as on the
laminæ substantially as described.
3. The projections e¹ on the end plates substantially as described.
4. Dynamos substantially as described and shown in the drawings.
Dated this 25th 1
J
1004
N. S. KEITH.