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APl'a 1, 1947-
A. HUNGERBUHLER EI'AL
2,413,251
PERMANENT BRAKE MAGNET FOR ELECTRICITY METERS
'
Filed July 31, 1945
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Patented Apr. 1, 1947
2,418,261
UNITED STATES: PATENT OFFICE
2,418,261
PERMANENT BRAKE MAGNET FOR
ELECTRICITY METERS
August Hungerbiihler, Zug, and Waldemar Lab
‘
hardt, Zurich, Switzerland, assignors to Landis
& Gyr, A. G., Zug, Switzerland, a body corporate
of Switzerland
Application July 31, 1943, Serial No. 496,970
In Switzerland November 30, 1942
3 Claims‘.- (014717-34)
1
2
It is commonly known to provide permanent ‘
brake magnets for electricity meters with a device
for rendering ineffective the in?uence of tem
perature ?uctuations on the operation of the
‘cure-sensitive magnetic material constitutes a
common thermal alloy whose permeability de
creases with rising temperature.
The small block (2 is pressed ?rmly to the one
narrow side of the pole a2 by a bail-shaped clamp
or tensioning piece e, i. e. in such a way that‘ the
clamping bail e clasps the other narrow side of
the pole a,2 and is connected with the ?ange Z1
through a tension screw 1‘. To prevent a dis—
meter, that is to say by balancing out errors thus _
caused in the indications of electricity meters by
altering the torque or brake moment in such a
way that the rotations of the driving disk of the
meters invariably remain proportional to the load.
For this purpose material sensitive to changes of
temperature has been employed which, for in
stance, is arranged on a bail connected in parallel
to one pole of the brake magnet in order to be
placement, the ?ange b at the pole a2 is together
with the small block cl secured to the magnet
body by means of a pin 0 being set into the flange
1); said pin protrudes an opening (11 of the small
block at and engages a corresponding cavity or
able to make full use of the pole surfaces (area A)
respectively of the magnet mouth. This ball was 15 recess on the magnet body a. On the other con
attached by one of its endslto the magnet body
and its free end was laid round the correspond
tact leg of the magnet a, the ?ange b is retained
in its place by the engagement of a boss ‘g-—
pressed out of the ?ange-with a corresponding
ing pole of the magnet and carried at the front
recess on the magnet body.
1
of the magnet the temperature-sensitive material.
The disposition round about the magnet pole of 20 Due to the fact that the ?ange laterally pro
vided on the magnet body as shunt and holder of
the bail end bearing the temperature-sensitive
the temperature-sensitive material and that this
material was in itself unsatisfactory as it did not
positively ensure a close contact of the tempera
ture-sensitive material on the magnet body, and
?ange acts upon said material by means of a
ten-sioning piece, the ?xture of this material be
even more unfavourable was the manner of the 25 comes independent from that of the magnet in
the meter, that is to say the positioning of the
only one sided attachment of the bail to the mag
temperature-sensitive material adjacent to the
net body, particularly the use of the means em
magnet pole does not depend on the procedure of
ployed for fastening the magnet to its support
fastening the magnet in the meter, which means
in the meter, i. e. a screw for simultaneously hold
30 that when the magnet is ?xed in the meter it is
ing the bail on the magnet.
not necessary to see that the temperature-sensi
The object of the invention is to provide an
tive material gets well into contact with the mag
improvement on brake magnets of the above men
net pole. By this method of fastening also an
tioned kind and according to it the material con
invariably good contact of the temperature
nected in parallel to the pole forms a bridge ‘over
two leg parts lengthwise to the magnet body and 35 sensitive material with the magnet pole is
achieved, as by means of the clamp c and the
keeps the temperature-sensitive material under
connecting screw 1 the ?ange b is stressed to
mechanical tension adjacent to the magnet body.
bending, thus pressing the material under ten
The accompanying drawing illustrates but one
sion against the pole.
form of embodiment incorporating the invention.
The small block d representing the tempera
Fig. 1 is a perspective view showing a typical 40
ture-sensitive material could also be disposed on
and illustrative embodiment of the invention; and
the middle leg of the magnet instead of at a
Fig. 2 is likewise a perspective view of the parts
pole of the magnet, i. e. there, where according
allocated to the magnet by the compensating
to the example of embodiment the boss g is lo
device. '
Referring more particularly to the drawing, the 45 cated, or there could be another block out of
temperature-sensitive material besides that block
letter a designates a brake magnet with an open
d close to the pole a2.
ing a1 for its attachment to the support of an
Instead of only one ?ange b with block d, there
electricity meter. b denotes a ?ange made of
could be arranged such a ?ange with a block
magnetically conducting material extending
lengthways to the magnet body between two leg 50 of temperature-sensitive material on either side
of the magnet body, whereby a screw connecting
parts thereof thus forming a bridge, whereby the
the ?anges through the space between the legs
one leg-part is identical with the one pole a2 of
the magnet. On this pole a2 the ?ange b is
of the magnet body would give to the ?anges the
pressed against a temperature-sensitive material
tensioning ensuring the good contact of the
in the shape of a small block d. This tempera
55 blocks with the magnet body.v Also in this case
3
2,418,261
the blocks made out of temperature-sensitive
central portion of the magnet at one side thereof
and one end of said strap is spaced from the
magnet by said material, a bail partially sur
alloy blocks could be provided at both places.
rounding said pole piece, and a tensioning member
The cavities or recesses on the magnet body
connecting the bail toan intermediate portion
may be created with the manufacture of the mag
of said strap to ?rmly press one end of the strap
net body, for instance, in a die. Thereby the
against the magnet and the other end against
recesses may be designed with inward taper and
said material whereby it is securely contacted
the pin 0 may be arranged with driving ?t placed
backward in the ?ange b. If the ?ange b is 10 with the magnet.
2. A permanent brake magnet as claimed in
?tted to the magnet body, the pin 0 is placed
claim 1 in which said tensioning member is a screw
forward in the ?ange what may be accomplished
threaded into said magnetically conducting strap
by pressure or impact action. Thereby the pin,
between its-ends for tightening the clamp and
which engages the recess already when the ?ange
is attached to the magnet body, is guided by the 15 pressing, the :bridge portion ends against the
magnet.
‘
wall of the recess thus centering the ?ange with
3.
A
permanent
brake
magnet as claimed in
the alloy block d upon the cavity.
claim 1 in which said magnetically conducting
The loosening of the ?xture of the tempera
strap includes fastening means passing through
ture-sensitive material from the ?xture of the
magnet in the meter offers a further advantage 20 the said strap into the magnet for additionally
securing the bridge portion to the magnet.
in that the magnet with the temperature com
pensating device can be kept in stock mounted
AUGUST HUNGERBiiHLER.
material may be ?tted to one pole leg as well
as to the middle leg of the magnet a, or such
as a whole, so that when a meter is ?nished-as
WOLDEMAR. LABHARDT.
‘
far as regards the brake magnet-only the regu
lating of the brake magnet to the running of the 25
REFERENCES CITED
meter is required in spite of the temperature
The
following
references are of record in the
compensating device.
file of this patent:
_It will be understood that the embodiment
UNITED STATES PATENTS
hereinbefore described about the brake magnet
‘under review has been given only by way of exam so Number
Name
Date
ple and that the details thereof may be modi?ed
1,702,457
Wall _____________ __ Feb. 19, 1929
without departing beyond the scope of the in
2,196,898
F‘aus _____________ __ Apr. 9, 1940
vention and set forth in the appended claims.
What we claim is:
1. A permanent brake magnet for electricity 35
2,309,414
1,737,506
meters with temperature sensitive material sup
ported on the magnet in which a magnetically
conducting strap extends from a pole piece to a
_
Number
385,723
Nobbs ____________ __ Jan. 26, 1943
McCraiken _______ __ Nov. 26, 1929
FOREIGN. PATENTS
Country
Date
British ___________ __ 'Jan. 5, 1933
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