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Патент USA US2412584

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Dec. 17, 1946.
Filed Dec. 14, 1942
2 Sheets-Sheet 1
13% 17, 1946-
Filed Dec. 14, 1942
2 Sheets-Sheet 2
Patented Dec. 17, 1946
Harry M. Kirschbaum, Detroit, Mich.
Application December 14, 1942, Serial No. 468,943
2 Claims. (Cl. 234--70)
The invention relates to exhibiting means de
Such an instrument while very sensitive to elec
signed for use in connection with various meas
trical changes is also affected by mechanical
uring instruments and of that type in which the
movements and vibrations so as to be unsuitable
for use on a traveling vehicle. I avoid such de
feet by the use of electromagnetic means and
connected mechanism which is non-sensitive to
record is a line or graph formed on a traveling
strip by means actuated by a variable electric
current. My improved recorder is more particu
larly intended for recording the oxygen content
of the blood as, for instance, that of an aviator
during ?ight at high altitudes, and may be used
in connection with such an instrument as that 10
forming the subject matter of my copending ap
plication for patent, Serial No. 449,489, ?led July
2, 1942. However, the device will be equally use
mechanical movements but will respond to elec
trical changes, the speci?c construction being as
A is a permanent magnet which has a central
pole member B and a surrounding annular pole
member C of unlike polarity. The members B
and C are connected at one end by the plate D
ful for other purposes.
so as to form in effect a return bent or horseshoe
It is the object of the invention to obtain a 15 cross section with the opposite ends of the mem
construction adapted for successful operation on
bers B and C constituting the poles. Mounted
a traveling vehicle or in other places where sub
in front of the poles is a member E preferably of
ject to jars, vibration-s or other disturbing con
ditions. To this end the invention consists, ?rst,
dielectric material. On this member is mounted
an armature F in the form of a lever which is
in a recording instrument which is unaffected 20 fulcrumed at one end on a pivot G. H is a re
silient member preferably a helical spring which
ther in the peculiar construction as hereinafter
is placed in a housing I secured to the member
set forth.
E. One end. of the spring H bears against the
In the drawings:
armature F to resiliently oppose its movement
Fig. 1 is a plan view of a portion of the record
toward the poles by the magnetic attraction
ing instrument on one side of a supporting plate,
thereof. The tension of this spring may be ad
its enclosing casing being omitted;
justed by a screw J which forms an abutment for
Fig. 2 is a perspective View of the electro
its opposite end. The member E is mounted on
magnetic actuated controlling means on the op
a suitable supporting base plate K through the
by mechanical movements of its support and fur
posite side of the supporting plate;
Fig. 3 is a section through this controlling
means substantially on line 3—-3, Fig. 2;
Fig. 4 is a section partly in elevation on line
4-4, Fig. 1;
Fig. 5 is a section on line 5——5, Fig. l; and
Fig. 6 is an elevation of a portion of the re
cording strip.
medium of posts K’.
On the opposite side of the plate K is mounted
a tubular housing L containing an electric lamp
or other source of light and in alignment with
this housing is a revoluble drum M. Passing
around this drum is a light sensitive strip N
which is supplied from a reel 0 and is advanced
by a winding reel P rotatable by any suitable
While the instrument for measuring the oxygen
means (not shown) such as a spring. Between
content of the blood is not a part of the instant
the drum M and the housing L is an oscillatory
invention and is not illustrated, it may be gen 40 member Q which passes through an aperture in
erally described as including a photo-electric cell
the plate K and through a guide bearing R. The
which is placed adjacent to tissue of the body as,
end of this member Q is pivotally connected at
for instance, the lobe of an ear and is subjected
S2 to one end of a lever S pivotally fulcrumed
to light which is transmitted through this tissue.
at S’ in a bracket T which is supported from the
Blood that is de?cient in oxygen is more opaque
member E. The opposite end of the lever S bears
to light than oxygenated blood and, consequently,
against the free end portion of the armature F
the blood circulating through the capillaries of
so that any movement of said armature is trans
the tissue where it changes in oxygen content
mitted through said lever to the member Q. A
will vary the quantity of light transmitted to the
spring U actuates the lever Q in the opposite di
photo cell. ' This, in turn, in connection with
rection from that imparted by the armature F.
suitable amplifying means will produce a Variable
The member Q is in the nature of a diaphragm
electric current which is used for operating the
or shield which obstructs the light from the
source within the housing L but which is pro
Many instruments heretofore made use a gal
vided with a transversely extending narrow slit
vanometer as the recording or indicator means. 55 Q’ for the passage of light. A second diaphragm
or light shield V is placed adjacent to the mem
ber Q and has a slit V‘ therethrough which ex
tends transversely to the direction of the slit Q’.
The combined effect of these two slits is to per
mit only a pencil of light to pass therethrough
passing through these apertures will trace a
series of parallel lines which together with the
graph line will appear upon the development of
the strip.
As above stated, my improved recording in
and to produce a light spot on the sensitive strip
passing over the drum M. Any movement of
the member Q in the bearing R will cause this
strument is not a?‘ected by vibrations or other
a variable current in a coil or helix W which is
tially unaffected by mechanical vibrations. Also,
located to surround the pole portion B and to lie
as the armature is of comparatively small mass,
the inertial force thereof is relatively small.
mechanical movements of the instrument. This
is for the reason, ?rst, that the member Q is
light spot to move transverselyof the-strip N
held by- the bearing R from any movement other
while the‘ advancement of this strip will‘ cause a 10 than the longitudinal movement thereof. Sec
relative longitudinal movement of the light spot.
ond, the armature F is held in ?xed position
Consequently, in operation the traveling of the
whenever the magnetic force is constant and is
light spot over the sensitive strip will produce a
balanced by the opposed force of the spring H.
line thereon.
This is for the reason that these opposed forces
The movement of the armature'F'is caused by
are of *su?icient magnitude to remain substan
between the same and the annular pole'portion
C. This coil has passed therethrough. The elec
What I claim as my invention is:
trical current which is supplied from the meas 20
1. An actuating mechanism for exhibiting
uring instrument and any variation in the volume
means adapted to eliminate inaccuracies due to
of .this current will produce a corresponding var
vibration when carried by a moving vehicle com
iation in the attractive magnetic force exerted on
prising a permanent magnet having a central
pole and a surrounding annular pole_ a helix
the armature F. It is, therefore, apparent that
where the magnetic attraction is increased the
within the space between said poles'for the pas
armature will be movedtowards the poles B and
sage of a variable electric current to correspond
C. This, however, by compressing the spring H
ingly vary the magnetic intensity, an armature
will increase its resistance until the two forces
extending across'and spaced from said poles, re
are brought into. balance. The movement of the
silient means for variably opposing the variable
armature is transmitted through the step-up ~ magnetic pole on said armature to counterbal
lever S to the member Q shifting the latter to a
ance the same in di?erent positions of the latter,
different position. In the same way any decrease
exhibiting means, and a connection between said
in the current volume passed through the coil W
armature and exhibiting means.
will diminish the magnetic attraction and permit
the spring H to move the armature F away from
2. An actuating mechanism for exhibiting
means adapted to eliminate inaccuracies due to
the pole and correspondingly movethe member
vibration when carried by a moving vehicle com
Q, This will produce a line or graph on the strip
prising a permanent magnet having a central
N which corresponds to variations in strength of
pole and a surrounding annular pole, a helix
the electrical current which, in turn, al‘eprO
within the space between said poles for the pas
duced by variations in.light impinging on the it) sage of a variable electric current to correspond
photo-electric cell caused by variations in the
ingly vary the magnetic intensity, an armature
oxygen content of the blood.
extending across and spaced from said poles, re
To facilitate the interpretation or measure
silient means for variably opposing the-variable
ment of the graph, it is advantageous to have
magnetic pole on said armature to counterbal
parallel lines equally spaced andrunning longi
ance the same in different positions of the latter,
tudinally of the strip N. These may be pro
exhibiting means, a member connecting said
duced by a member X which contains an electric
armature with said exhibiting means, and a bear
lamp X3 or other source of light’and which has a
ing with which said member is slida-bly engaged
curved guide way X’ over which the strip N is
cooperating with said armature and resilient
passed with a series of ,equispaced minute aper- -' means to resist movement thereof by other force.
tures vX2 through this guide way. 'Thus,ilight
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