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Патент USA US2112994

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April 5, 1938»
c. G. MULLER.
2,112,994
GENERATOR BRUSH GRINDER
Filed May 14, 1937
Inventor
C.
Mu/Zfer
, ‘By?m
,4 itorneys
2,112,994
Patented Apr. 5, 1938
UNITED STATES PATENT OFFICE
2,112,994
GENERATOR BRUSH GRINDER
Christian G. Muller, Somerset, Mass.
Application May 14, 1937, Serial No. 142,701
1 Claim.
(Cl. 51-241)
This invention relates to a grinder device for
brushes of generators, the general object of the
invention being to provide a band of resilient
material and having an abrasive outer face so
5 that when the band is placed on the commutator
with the brushes engaging the abrasive face and
the parts rocked, said abrasive face will grind or
cut the ends of the brushes whereby said brushes
will properly contact the commutator when the
ll)
band is removed and the generator is in operation.
This invention also consists in certain other
features of construction and in the combination
and arrangement of several parts, to be herein
after fully described, illustrated in the accom
panying drawing and speci?cally pointed out in
the appended claim.
In describing the invention in detail, reference
will be had to the accompanying drawing wherein
like characters denote like or corresponding parts
throughout the several views, and in which:—
Figure l is an end view showing the invention
in use, the parts of the generator being shown in
dotted lines.
Figure 2 is a top plan view of the device.
Figure 3 is an end View.
Figure 4 is a section on the line 4—4 of Figure 3.
In this drawing the numeral 1 indicates the
band or ring formed of thin spring metal or the
like and of split construction. The outer face or
O: O
so as to prevent the ring or band slipping‘ on
the commutator.
The device is expansib-le due to its spring con
struction and can be placed on commutators of
different sizes.
It will, of course, be understood that the gen
erator must be disassembled sufficiently to- permit
the device to be put in place with the brushes
engaging the outer circumference thereof as
shown in dotted lines in Figure 1. Then the parts
are rocked to cause the abrasive face of the band
to engage the ends of the brushes. The brushes
are quickly serviced by the device in a uniform
manner and after the brushes have been ground
to the proper contour the armature is slipped out H Co
of the brush end from the generator, the grinder
removed and the generator reassembled.
that the advantages and novel features of the in
vention will be readily apparent.
It is to be understood that changes may be
made in the construction and in the combine;
tion and arrangement of the several parts, pro
vided that such changes fall within the scope
of the appended claim.
What is claimed is:
A grinding device for the brushes of a generator
which includes a commutator having spaced
notches therein, comprising a split ring of spring
circumference of the band or ring is roughened as’ ~metal adapted to ?t over the commutator, trans
shown at 2 to form a cutting or abrading face. versely extending lugs‘ on the inner circumference
Instead of roughening the outer circumference of the ring and spaced apart substantially the
sand paper or the like may be suitably attached
to said face. Lugs 3 are formed on the inner
09 Cl circumference of the band for engaging the
notches in the commutator, shown in Figure 1,
'
It is thought from the foregoing description
same distances as the notches are spaced apart,
said lugs engaging the notches and said ring hav
ing an abrasive outer circumference.
CHRISTIAN G. MULLER.
20
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