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Патент USA US2403513

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July 9, 1946‘
Filed‘Sept'. 21,, 1-943
2 Sheets-Sheet 1
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W/ 711/566‘:
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July 9,1946.
‘ 2,403,513 _
Filed Sept‘. 21, 1943
2 ‘Sheets-Sheet 2
(Jil n
Patented July 9, 1946
ErikAugust Forsberg, Nockeby, Sweden, assignor
to Aktiebolaget Separator, Stockholm, Sweden,
a corporation of Sweden
‘Application September 21, 1943, Serial No. 503,209
In Sweden October .8, 1942
2 Claims.
.For various purposes, for instance in the bal
ancing ofrapidly rotating bodies, it is important
(Cl. 73-—66)
any other point of the body I or ofyany part
rotatable therewith.
to be able .to determine, with regard to their mag
The magnitude of the de?ection is calculated
nitude and preferably also to their position, the
in' linear measure from the middle position;
deviations which, during rotation, are carried. out 5 the position of the de?ection in angular measure
by'the. body from its position of equilibrium, or
from any ?xed point of the body I,
what is called the deflection of the body. The
For determining the magnitude of the de?ec
present invention has for its object to enable a
tion a radially displaceable organ provided with
quick and exact measuring of such de?ections.
a measuring device, for instance a micrometer
Fig. 1 is a diagrammatic side view of a body 10 screw II, is used. The body I and the measuring
mounted on a spindle associated withde?ection
element II are spaced from each other andeach
determining means.
connected to one of the poles of an electricity
Fig. 2 is .a detail sectional View through shaft
source I2,_suitably for direct current. At the
~2,- showing a top view of elements I5 and I‘!
measuring the element llyislmoved radially in
of Fig. 1, with contact I5 on element I7.
15 wards towards the body I until these parts come
‘Fig. 3 is .a vertical section of an element to be
into contact with each other at that moment
balanced, mounted for de?ection in any direction
when the deviation of the body I is directed
and showing auxiliary elements useful in deter
towards the element I I. In the electric circuit
mining the de?ection.
a series of short impulses will then occur, which
Fig. 4 is a vertical section similar to Fig. 3 20 should be observed in any suitable way; For
of an alternative arrangement.
this purpose a telephone receiver may be used,
Figs. 5 and 6 show alternative methods for
producing a tone ofa frequency equal to the
determining the amplitude of de?ection.
number of revolutions of the body, or advantage
The body I may be assumed to be secured to
ously a galvanometer I3. In any case it may
a shaft 2, which can swing about the point 3. 25 be of‘ advantage to amplify the current impulses
If the body I is a centrifugal bowl, the shaft,
in a manner known per se by means of an ampli
between the body and the point 3, may be sup
?er I4.
ported by a radially elastic bearing, which is
The position of the measuring element I I at
not shown, since it is well known in the art.
a de?ection equal to 0, i. c. with a body standing
If there are no disturbing forces and if the body
still in the middle position or with an exactly
I is mass-symmetric about the shaft 2, the latter
balanced body, is determined and advanta
will lie still in space and take up the position
geously set to 0. The position of the element II
3-4. The body will then occupy the position
relative to this zero-position at the moment when
shown, in full lines and no de?ections will take
place. 0n the contrary, if the body is not mass- I’ current impulses at ?rst occur, obviously indi
cates the magnitude of the de?ection. The point
symmetric about the shaft 2, the latter will de
of the element II should be made of a hard
scribe a conic surface having’ its pointed end at
material not readily oxidable in order to prevent
the point 3 and will thus take up the positions
rapid change of the zero-position by wear. It
5 and 6 at intervals of half a turn, the body I
may also be suitable to make the point elastic
thereby occupying the positions 1 and 8. At the
to a certain degree.
top-side of the body I there will then be the
For determining the position of the de?ection
de?ection 9 and at its bottom side a de?ection
a special device is used for connecting the electric
Ill. The de?ection may also be referred to the
line to the rotating system. The current is led
shaft or any other part connected to the body
in series through a stationary ring 22, a ring
or the shaft. It should be observed that the 45 23 supported thereby and revoluble therein, an
arm 24 and a lever 25, to a piece I5, which, by
manner in which the body is maintained in ro-v
movement of lever 25, may be made to contact
tation and the way in which the shaft is sup
or clear an element I6 taking part in the rota
ported is of no importance, since while these
tion. In order to avoid vibrations at the con
factors may have an in?uence on the interpreta
50 tacting surface, this is advantageously formed
tion of the de?ections, they do not affect the
as a sector of a sphere having the point 3 as
determination of the same, which latter is the
its centre. The element I ii is electrically con
sole object of this invention.
ductive and electrically connected to the rest of
Thus the purpose is to determine the de?ection
the rotating system, but is provided with an in—
9 and/or the deflection II), or the de?ection at 55 sulated section I‘! as indicated in Fig. 2. The
the shaft 2 and the body I are maintained in
said element should be connected for rotation in
synchronism with the body I and always in
unchangeable position relative to each other.
such a way that thesection I1 has a known
body I with special measuring elements which
position relative to the ?xed point of the body
to which the position of the de?ection is re
ferred; the section I1 and the ?xed point should
advantageously be arranged in the same radial
It is in many cases preferable to provide the
are placed on the body I in such a manner
that their symmetry-axis coincides with the axis
whose de?ection is to be measured.
If, as is often the case with separator bowls,
plane. The contacting piece I5 is supported in
the body I is provided with a central hole, meas
such a way that it can be turned around the 10 uring elements I9, 20 as shown in Fig. 3, could
shaft 2 and that its position can be read off.
be inserted in the hole at one or both ends. Or
One of the rings 22 and 23 may be provided
the body may be placed in a casing 2|, Fig. 4,
with a pointer and the other with a graduated
concentric with the body I, and against which
scale. If, at the moment when the body I is
the measuring is carried out.
contacting with the element II, the piece I5
Such measuring elements (and perhaps in par
contacts with the element I6 at a point other
ticular cases the body I itself) may be so ar
than the insulated section H, the circuit is closed
ranged that automatic adjustment to zero is
and a current that de?ects the galvanometer
obtained. Fig. 5 shows the principle hereof. I
?ows. If the contacting piece I5 is now turned
assume that a measuring element 22 has been
around the shaft 2 until it touches the section
placed on the body in one way or other. The
I‘! at the contacting moment, no current can pass
element is in the .form of a ring, concentric
and the deflection of the pointer ceases. Thus,
with the axis of the body. (If any part of the
the position of the contacting piece I5 when the
body itself is shaped in this way and in other
de?ection of the pointer ceases shows the posi_
respects suitable for measuring according to this
tion of the de?ection. If the device is so ad
method, the measuring element 22 could of
justed that the section I1 and the fixed point 25 course be dispensed with.) The measuring ele
lie-at the same axial plane, and the de?ection
ment III] is here double-sided, so that the meas
of the galvanometer pointer ceases when the
uring can be carried out by moving it either
contacting piece I5 occupies the position shown
inwards or outwards. When the measuring is
in Fig. 2, it is obvious that the de?ection of the
made, the element III] is ?rst moved in the one
body I amounts to the angle a from the ?xed
direction, for instance inwards, until it contacts
point, reckoned in the direction of the move
with auxiliary element 22. The position of the
element III] is observed; for the sake of con
It may, however, happen incidentally that the
venience the scale may here be adjusted to zero.‘
contacting piece I5 is in the right position al
Then the measuring element III) is pushed in
ready at the beginning. No deflection of the 35 the opposite direction until it contacts again.
galvanometer pointer I3 will then take place, and
there is thus a risk that the measuring element
II is screwed too far inwards and may get
damaged by too heavy blows against the-body
I. To avoid this the contact between the ele
ments I5 and It may be coupled in parallel
with a switch I8, which in the ?gure is shown
connected to the point 3, .but it will be under
stood that it may be coupled to any other point
of the rotating system, for instance to the lower
side of the element I6. At the beginning of the
measuring the switch I8 is kept closed, and con
If the displacement required, which is indicated
by the measuring element III], is s, the distance
between the two contacting surfaces of the
measuring element III! is a, and the thickness
of the ring 22 is b, the magnitude of the de?ec
tion is obviously =1/2 (a-b-s).
The deviation is thus determined without hav
ing to carry out adjustment relative to the body
I in its position of rest.
The same principle may be used with the shaft
itself, or with an auxiliary measuring element
placed centrally as shown in Fig. 3-—or even with
sequently the current can pass thru as soon
the body itself—-by measuring on both sides, as
as the body I and measuring element II con 50 indicated in Fig. 6. If the diameter of the aux
tact, even if at that moment the contacting
iliary element (the shaft or the body) is d, then
piece I5 happens to be at the section I'I. As
the de?ection is =1/2 (a—d—-s) .
soon as the pointer of the galvanometer I3 de
What I claim and desire to protect by Letters
?ects, the switch is opened and-if required
the contacting piece is turned until the de?ection 55
of the pointer ceases.
The measuring is now
Patent is:
1. Means for measuring the deflection of a
rotating body supported on the outer end of a
shaft, a radially adjustable element adapted to
It is also possible ‘to make the element It
be adjusted radially with relation to the rotat
insulated and to have the section I‘! in electric
ing body to make electrical contact with the
connection with the rotating system. In such 60 rotating body after de?ection, an element rotat
a case the de?ection of the galvanometer pointer
able with thebody having an electrical contact
will usually cease when the switch I8 is opened,
portion and an insulated portion, an electrical
and will appear again when the contacting piece
contact member adapted to engage the element
I '5 stands in the right position.
rotating with the body, said electrical contact
If it is desirable to carry out the measuring 65 member being adapted to be shifted about the
at different axial heights, either two or more
axis of the shaft over the face of said rotating
measuring elements II may be used, or the ele
element, and an electric circuit having in series
ment I I may be axially adjustable.
a source of current,jthe body, the element ro
It has been assumed above that the measur
tatable therewith, the electric contact member,
ing is carried out against the body I itself. The
the radially adjustable element and an indicating
body I is, however, often by reason of its shape 70
or the nature of its surface unsuitable for this
2. Means for \measuringthe de?ection of a
purpose, and there may also be other reasons
rotating body supported on the outerend of
for effecting the measuring otherwise. The
a vertical shaft which can be swung about the
simplest way is then to measure against'the
end thereof, a radially. adjustable element
shaft 2 which, however, can be done only if 75
adapted to be adjusted radially with relation to
the rotating body to make electrical contact with
the rotating body after de?ection, an element
being adapted to be shifted about the axis of
the shaft over the face of said rotating element,
rotatable with the body formed as a sector of a
of current, the body, the element rotatable there
sphere having an electrical contact portion and
an insulated portion Whose center is located at
the other end of the shaft, an electrical contact
member adapted to engage the element rotating
with the body, said electrical contact member
and an electric circuit having in series a source
with, the electric contact member, the, radially
adjustable element and an indicating instru
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