Improvements in Electricity Meters.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Electricity Meters.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, in the County of London, Consulting Engineer and Chartered Patent
Agent, do hereby declare the nature of this invention (as communicated to me
from abroad by Société Anonyme Continentale Pour la Fabrication des Compteurs
a Gaz et Autres Appareils, of 9, Rue Pétrelle, Paris, France) to be as follows:-
This invention relates to electricity meters in which a motor, actuated by
the current to be measured or part thereof is connected by gearing to a counter
which registers the number of its revolutions, the motor being retarded by a
magnetic brake. It is on the construction and arrangement of such brake that
the present invention chiefly bears, but it bears also on improvements in details
of the motor itself.
The motor consists of an armature mounted on a vertical axis and revolving
in a magnetic field.
The ends of the axis are pointed and revolve in sliding jewel bearings.
pressed, the one downwards the other upwards by light springs, either or both
being adjustable. In order that the meter may be moved about without injury
to the bearings of the axis, the socket holding the upper jewel can be pressed
down until collars on the axis meet the sockets which contain the jewels, the
axis being thus held firmly between the sockets while the strain on its pivot
points is only that of the springs which bear on the jewels.
The magnetic brake is arranged as follows:-
From the lower part of the axis project arms which carry a light cylindrical
shell, preferably of copper. Around the axis below this shell are fixed, circularly
arranged, a number of U shaped permanent magnets, between the upright
limbs of which the shell revolves, so that it is retarded by the Foucault currents
generated in it. The magnets are carried on a frame which can be raised or
lowered so as to engage the shell to a greater or less depth between their limbs,
and so to increase or diminish the brake power.
It is convenient to mark on
the shell a graduated scale shewing the depth to which it is engaged between
the magnet limbs.
Mid thin 51ại Jar of Sil 1800
ABEL & IMRAY,
Agents for the Applicant.
Improvements in Electricity Meters.
I, Charles DexTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, in the County of London, Consulting Engineer and Chartered Patent

page_text: Agent, do hereby declare the nature of this invention (as communicated to me
from abroad by Société Anonyme Continentale Pour la Fabrication des Compteurs
à Gaz et Autres Appareils, of 9, Rue Pétrelle, Paris, France), 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 electricity meters in which a motor, actuated by
the current to be measured or part thereof is connected by gearing to a counter
which registers the number of its revolutions, the motor being retarded by a
magnetic brake. It is on the construction and arrangement of such brake that
the present invention chiefly bears, but it bears also on improvements in details
of the motor itself, as I shall describe referring to the accompanying drawings.
Fig. is a front view, partly in section and Fig. 2 is a side view partly in
section of an electricity meter according to this invention.
The motor, which may be of various forms, is shewn as consisting of a circular
coil A of large wire, and a bobbin B of fine wire fixed on a vertical spindle on
the upper part of which is a worm V gearing with the driving wheel of a
counter G.
The armature spindle has at each end a V point centred in jewels pressed
towards each other by adjustable springs the lower of which is marked R. In
order to save the spindle points from damage during transport, a setting screw
being loosened, the sleeve E is pressed down till the conical shoulders con
the spindle bear against the seatings d, whereupon the screw is again tightened,
the spindle being thus firmly held during transport.
The brake comprises a copper cylindrical shell or ring C connected by light
spokes to the spindle, and revolving between the limbs of a number of horse shoe
permanent magnets a carried on spokes projecting from a sleeve m fitted as
a nut on the upright F which is externally screw threaded, so that on turning
the nut m the magnets a can be raised or lowered. On the ring C a scale is
marked, so that the depth to which it enters between the limbs of the magnet
can be readily seen and adjusted.
Having thus particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what
I claim is:-
1. An electricity meter constructed and operating substantially as described
with reference to the drawings.
2. The herein described means of securing the motor spindle during transport.
3. The brake consisting of a copper ring revolving between the limbs of a
number of horse shoe magnets, substantially as described.
4. The mounting of the magnets on a nut which can be screwed up or down
a central upright, so as to regulate the depth to which the copper ring enters
between their limbs, substantially as described.
Dated this 5th day of December 1899.
ABEL & IMRAY,
Agents for the Applicant.