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Патент USA US2406262

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> Aug. 20, 1946.. '
L. H. STAUFFER
2,406,262
CURRENT COLLECTOR
Filed Oct. 8, 1943
Inventor:
Lynn H.Stauff‘er','
by x/
ml
Himtorneg.
Patented Aug.20, 1946
2,406,262
UNITED STATES PATENT OFFICE
2,406,262
CURRENT COLLECTOR
Lynn H. Staliffer, Pattersonville, N. Y., assignor
to General Electric Company, a corporation of
New York
Application October 8, 1943, Serial No. 505,447
6 Claims.
(01. 1'71--320)
1
2
My invention relates to current collectors and
_
particularly to current collecting devices such as
Metal (percentages)
are used with dynamoelectric machines and are
adapted to be contacted by a brush.
Alloy No.
Copper
Zinc
Lead
Tin
An object of my invention is to provide an im~ 5
proved current collector made of a copper base
so
as. 5
0. 7s
0. 7(5)
alloy.
s4
is
'o
l
69
30
0
l
Further objects and advantages of my inven
tion will become apparent and my invention will
be better understood from the following descrip- 1;,‘ While I have mush-med and described partic
tion referring to the accompanying drawing, and
may embodiments of my invention, modi?cations
the features of novelty which characterize my
invention will be pointed out with particularity
in the claims annexed to and forming part of
this Speci?cation.
theregf W111 occur to those skilled in the art. I
desire it to be understood, therefore, that my in_
Vention is not to be hmited to the particular and
15 rangements disclosed, and I intend in the append
rI‘he drawing shows a brush and a fragmentary
ed Claims to cover an modi?cations which do not
View of a commutator embodying my invention.
depart from the spirit and scope of my invention.
Referring to the drawing, I have Shown a 0111“
What I claim as new and desire to secure by
rent collector in the form of a commutator inLetters Patent of the United States, is:
cllldi'rlg a plurality of commutator bars l0 adapt- :20
1. A current collector member adapted to be
ed to be contacted by a brush ll made of any
contacted by a brush and for a dynamoelectric
suitable material, such as carbon, and provided
machine formed of a copper base alloy including
with a conventional pigtail conductor for profrom 60% to 85% copper and 40% to 15% zinc.
viding an electrical connection between the brush
2. A current collector member adapted to be
H and a conventional brush holder terminal. It 25 contacted by a brush and formed of a copper
has been found that when current collectors oDbase alloy including from 60% to 85% copper and
crate in dry and rare?ed atmospheric conditions,
40% to 15% zinc, with from 0.5% to 4% lead,
a carbon or graphite base brush tends to Wear
away very rapidly when the current collector
which the brush contacts is formed of copper,
and ‘0.5% to 2% tin.
3. A current collector member adapted to be
contacted by a brush and formed of a copper
as in the conventional construction. Ihave found
that if the current collector member is formed
base alloy including substantially 60% copper,
substantially 38.5% zinc, 0.75% lead, and 0.75%
of a copper base alloy including from 60% to 85%
copper and 40% to 15% zinc, the life of the com
tin
4. A current collector member adapted to be
tact brush is greatly increased. In addition, I 3” contacted by a brush and Emma of a copper
have found that if such a current collector alloy
base alloy mcludmg ,Substantlany 615% copper’
also is provided with a small percentage of lead
or tin or both lead and tin, similarly greatly in-
substantla’ny 354% Zmc’ and 3'1% lead‘
5' A current cotlector member adapted m be
creased brush life may be expected. More spe-
contacted ‘b-y 9’ bush and fol-“med of a copper
ci?cally, the lead content should preferably be 40 ggggtaaéiggnglnféléglgicslggsgainél?g 84% copper’
from 05% to 4% and the tin content from 05%
6. A current collector member adapted to be
to 2%. The following four compositions ‘ of this
contacted by a brush and formed of a copper
type alloy have been found to be particularly
base alloy including substantially 69% copper,
bene?cial in increasing brush life when used in 45 substantially 30% zinc, and 1% tin.
making commutators or collector rings;
LYNN H. STAUFFER.
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