Патент USA US2412584код для вставки
Dec. 17, 1946. H. M. KIRSCHBAUM 2,412,584 EXHIBITING INSTRUMENT Filed Dec. 14, 1942 2 Sheets-Sheet 1 H61. FIG.2. INVENTOR. HARRY M. KIRSGHBAUM ATTORNEYS 13% 17, 1946- H. M. KIRSCHBAUM 2,412,584 EXHIIEBITING INSTRUMENT Filed Dec. 14, 1942 Flee; 2 Sheets-Sheet 2 FIG.4. INVENTOR. HARRY M.K|RSCHBAUM ATTORNEYS Patented Dec. 17, 1946 2,412,584 UNITED STATES PATENT OFFICE 2,412,584 EXHIBITING INSTRUMENT Harry M. Kirschbaum, Detroit, Mich. Application December 14, 1942, Serial No. 468,943 2 Claims. (Cl. 234--70) 1 The invention relates to exhibiting means de 2 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 follows. 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 recorder. 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 2,412,58é 3 4 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 HARRY M. KIRSCHBAUM.