Year: 1888

page_text: 1, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, and Co., Patent Agents,
Southampton Buildings, in the County of Middlesex 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:-
The main feature of my invention is a double armature composed of two cores each
with its coil, both cores and both coils being arranged on a single axis, as shown clearly
in Figure 4, in order to form an armature adapted for use as a double revolving
armature, as more fully described below.
In the accompanying drawings
Figure 1 is a plan of my apparatus, in a box or case.
Figure 2 is an end view, and
Figure 3 a side view of the armature.
Figure 4 is a cross section showing the armature and the pole pieces of the
magnet.
Figure 5 is a diagram for explanation.
In the drawings A, A1 A2 A3, represent four magnets whose eight poles are arranged
together to form two north poles and two south poles.
When arranged as shown in Figure 1, the pole piece a presents a north pole to the
armatures B, B¹; the pole piece a¹ a south pole, a² a north pole, and a³ a south pole ;
and when the armatures are in the position shown in the diagram, Figure 5, the current
in both armature coils is in the same direction as shown by the arrows; that is the
current leaves the coil of B, and also leaves the coil of B at N, and enters the coil
of B, and of B¹ at S. It will be seen that the wire b, which extends from the N and
of B coil to the N end of B¹ coil, is in electrical connection by wire with the half
ring d; while wire 62 which connects the S end of B coil to the S end of B' coil is in
electrical connection by wire 63 with the half ring d'; consequently the brush f is one
DQ77

page_text: pole and the brush f¹ the other pole of the apparatus; and the wire ₤2 joining these
poles represents the line wire. When the armatures are in the position shown in
Figure 5, the polarity of the half ring d, will obviously depend upon the way in which
the coils are wound; but when the N end of B' leaves the pole piece a³ and the S end
of B¹ the pole piece a² (and simultaneously the N of B leaves pole a' and S of B pole
picce a), the current is reversed; consequently there are two currents in one direction
and two currents in the opposite direction for each revolution of the armatures B, B¹.
The polarity of the half ring d, is always opposed to that of the half ring d¹, and these
rings are electrically insulated, one from the other; but one is in electrical connection
with one end of the line wire, and the other with the other end of the line wire by
means of the brushes ff. It will also be clear that two entire rings may be used
instead of the two half rings d d¹; and in that case the brush will be in contact with
one of the rings, and the brush f¹ with the other; the two rings being insulated one
from the other, and each ring being alternately plus and minus.
The armatures B B¹ are connected by discs g, g¹ and are separated by wooden or
other non-magnetic bars 92, these bars being merely for convenience as the cores of
the armatures are sufficiently held apart by the discs.
The disc g supports the journal h and the disc g' the journal ', and these journals
enter boxes in bridge pieces one on each side of the apparatus. The pinion j, meshes
with the driving gear j', to the shaft of which the handle is attached.
The magnets are held together in any suitable way as will be plain to all skilled in
the art.
Each pole piece a a¹ &c. is arranged in a mould in its proper place, that is, each is
at the proper distance from the other; and melted non-magnetic metal is poured in,
such as brass, lead, or the like. The non-magnetic metal enters holes in the
pole pieces, or flows around non-magnetic bolts o so that the four pole pieces
are firmly held together and adapted to receive the magnets and also the armatures.
In Figures 4 and 5, the non-magnetic metal at is held mainly by the bolts o by which
the pole pieces are held together.
In Figure 5, the half ring d is plus and the half ring d' minus when the armatures
are as shown in that Figure. The current through the line is from f¹ to f, but when
the armatures are moved through 90° the half ring & becomes minus and d¹ plus, but
as the brushes ff have changed contact with the half rings, that is, f is in contact
with d and f¹ with d¹, the current over the line is as before, that is, from f¹ to f.
On the next quarter of the revolution, that is, when the armatures have been moved
the second 90° (or 180° from their position shown in Figure 5), the half-ring d will
be plus and the half-ring d¹ will be minus, but the current will be from f to fl
because is then in contact with d, and f¹ with d¹. On the next quarter of the
revolution, the half-rings d d again change their polarity, & being minus and d¹ plus,
but the current is the same as before, for f is then in contact with d' and with d.
In this way there are two pairs of currents in the opposite directions, sent through
wire at each revolution of the armatures; and one purpose of this arrangement of
the half-rings d d and brushes ff¹ is to cause a bell hammer arranged between two
bells, and actuated by the currents generated by my device, to strike two blows upon
one bell, then two upon the other for each revolution of the armatures B B¹. Other
uses will suggest themselves to all familiar with the art.
When simple alternate currents are required the half rings d, d¹ are not necessary;
but this arrangement whereby I get currents in pairs, is an important feature of my
invention.
One of the chief advantages of my new apparatus is that multiplying gear can be
dispensed with; for although I have shown such gear in Figure 1, that is solely
because I wished to indicate the medical use of my apparatus, but with my double
armature each revolution will give for example four currents with a four pole magnet,
eight currents with an eight pole magnet, and so on, for each revolution of the
arinature; and consequently no multiplying gear is needed for many uses of my
apparatus. This is a practical matter of considerable consequence, as it greatly lessens
the expense of construction.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed as communicated to me
by my foreign correspondent I declare that what I claim is :-
First. The double armature above described composed of the two cores and the two
coils, the cores being held together back to back, but magnetically insulated,
substantially as shown."
Second. In combination, the double armature B B¹ and its two coils, the
magnets A A¹ &c., and the electrodes d d¹ and ff¹, whereby the currents are sent
in pairs over the line as set forth.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.