Improvements in Electric Metors.
Year: 1898

page_text: Date of Application, 9th Sept., 1898-Accepted, 2nd Sept., 1899
COMPLETE SPECIFICATION.
Improvements in Electric Metors.
I, CORNELIUS CANTÉ, of No. 10, Hofstrasse, Frankfort-on-Main, in the German
Empire, 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 electric meters, which are of simple construction and
very reliable and are arranged so that an armature continuously rotated by
clockwork is subjected to the influence of a double coil, through one winding of
which flows the current to be measured which has a weakening effect on a constant
current flowing through the other winding situated preferably in the shunt
circuit so that the retardation of an armature brake is reduced according to the
amount of current used and such increase of velocity of rotation of the brake
armature is transmitted to indicating devices.
In order that this invention may be the better understood, I now proceed to
describe the same reference being had to the accompanying drawings and to the
letters and figures marked thereon. Like letters refer to like parts in the various
figures.
Figure 1 is a side view of the electric meter.
Figures 2 and 3 shew details of the arrangement of the armature.
An armature a Figures 2 and 3, is exposed to the influence of a magnetic field
produced by coils b and c. The coil is preferably wound of thin wire which is
arranged in shunt circuit to the circuit carrying the working current. The outer
coil wound preferably of comparatively thick wire is inserted direct into the
working circuit and is arranged so that the current which passes through it has
the tendency to weaken the field produced by the coil b. Therefore the stronger
the current is which passes through the coil c the less will be the retarding action
of the coil on the armature a.
The armature a is connected to a clockwork which is conveniently operated
by a weight e Figure 1 which acts on a lever f, which engages by means of a
pawl g with a ratchet wheel Figures 1 and 2 thus rotating the gearing d and
the armature a. The axles of the gearing wheels are connected to pointers,
moving over corresponding dials. This movement of the pointers is influenced
by the retardation of the armature a and therefore by the working current which
flows through the coil c.
When the weight e has run down so far that the fore end of the lever f strikes
upon a spring previously overcome by the weight e comes into action and
causes the whole mechanism to swing out around the pivot k. The piece m
through which flows the working current to be measured then cuts off the latter.
The swinging out of the clock-work casing operates also the bell which thus
calls attention to the necessity of winding the clockwork by raising the weight e.
The clockwork may alternatively be operated by a spring.
As soon as the weight is suspended freely the spring / has again been over-
come, the whole mechanism is inclined to the left and places the connecting

page_text: piece m into action so that the working current can flow again through the
circuit. In order to ensure that the gearing mechanism shall act only when
current is being used the arrangement shewn in Figure 2 is provided.
A magneto attracts an armature q as long as current is used the armature q
presses a retarding spring out of the path of the vanes p operated by the clock-
work. When no current is used and thus the coil o does not carry any current a
spring connected to the armature 7 comes into the path of the vanes p the clock
work stands still without running down uselessly. Part of the mechanism is
fixed to a wall or board d of insulating material.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed 1 declare that what
I claim is:-
1st. An electric meter in which an armature a rotated continuously by a
clockwork is exposed to the magnetic influence of a double coil one of which c
carrying the current to be measured has a weakening effect on the other coil b
carrying a constant current so that the constant retardation of the armature a is
reduced according to the amount of current used and such increase of speed in
the revolving armature is transmitted to indicating devices.
2nd. A mode of construction of the electric meter claimed in Claim 1, in which
the whole clock-work with its casing can be rotated around a pink and is caused
to swing out when the clock work has run down by a spring set free thereby in
order to cut off the working current and to operate a signal to give notice
thereof.
3rd. A mode of construction of the electric meter claimed in Claim 1 in which
the clockwork is kept still and prevented from running down uselessly by the
arrest of vanes p until the electric current by a coil o and armature q sets free
the vanes p.
Doted this Oth date of Cantamhan 1000
FELL & JAMES,
Agents for the Applicant.