US1904435A - Indicator device - Google Patents

Description

April 1933- H. A. FLAMMER 0 INDICATOR DEVICE Filed Sept. 9, 1930 INVENTOR By HAFLAMMER J? %(de 250mg ATTORNEK Patented Apr. 1 8, 1933 "UNITED STATES PATENT OFFICE HOWARD A. FLAMMER, 0E NEWARK, NEW JERsEY, ASSIGNOR T0 BELL TELEPHONE LABORATORIES, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK INDICATOR DEVICE Application filed September 9, 1930. Serial No. 480,651.

This invention relates to an indicator device for use in artificial respiration producing apparatus of the type disclosed in a copending application to J. S. Waterman, filed July 19, 1930, Serial No. 462,158.- In that machine the patient is placed on an inclined base with his arm pits resting on movable supporting members. A reciprocating handle operating member is provided for imparting movements to the movable supports and to a pair of bars disposed in lines parallel to the inclined surface of the base. These bars carry a belt arranged to secure pads in close contact with the body of the patient, the arm pit supporting members and the belt being actuated in such a sequence of operation as to induce artificial respiration in the manner of the so-called Schaefi'er method of resuscitation.

In such a machine, however, it is necessary that the handle operating member be actuated'at a constant number'of strokes per unit of time in order to secure the desired effect.

The object of this invention is to provide a device which will indicate therate of movement of the operating member of the machine in a simple and positive manner.

In accordance with this invention a pressure gauge of the Bourdon type is operated by air pressure built up in an expansion chamber by the movement of a piston in a cylinder. This piston is actuated by the movement of the reciprocating handle memher and a system of valves controls the pressure in the chamber, the gauge being graduated in a manner to translate the pressure in the chamber in terms of the number of strokes of the handle per unit of time.

In the drawing,

Fig. 1 is a perspective assembly view of the artificial respiration producing machine showing the indicator mounted thereon;

Fig. 2 is a view of the indicator with a number of operating parts in section and Fig. 3 is another sectional view of the indicator.

In more detail the artificial respiration producing machine to which this indicator device may be used generally consists of a base 10 having an inclined top surface provided with a pad or mattress 14 upon which the patients chest is supported. A head rest 15 is adjustably mounted on brackets 17 and 18 which are in turn secured at the lower endsto the base 10. A pair of supporting plates 19 andQO fit the patients arm pits andare hinged to the base 10. These'plates are arranged to be actuated to and from each other by the movement of a hand operating member 26, through respective connecting rods such as 24. to opposite sides ofthe base 10 on pivots 26, one of them being shown in Fig. 1. To the opposite sides of base 10 are pivotally mounted as at 39, the bell crank leverslO. The ends of these levers are connected to the operating handle lever members as at 41- and to a pair of parallelly disposed movable bars 35 to which the belt portions 27 and 28 are attached and arranged to be secured in close contact with the body'of the patient. Each of these bars are pivoted at their other ends on links 38 in order to impart to the-belt 27'28, during each stroke, movements in directions substantially at right angles'toeach other, the combined actions of the supporting plates 19 and 20 and the belt 27-28 on the patient being better known as the Schaefi'er method of resuscitation.

One of the bell-crank levers 4.0 is provided The handle lever is pivoted with an arm 50 towhich a rod 51 is con nected. This rod carries a piston 52 arranged to be reciprocated in a cylinder 53 for pumping air in a pressure chamber 54 under control of a valve G0 which consists of a. ball 68 and a spring 67 holding this ball against the seat of this valve. 3T0 chamber 54: is connected a gauge '55 through the medium of a pipe 56. The inlet valve IN consists, of a cylinder 159 having an aperture 59 and a piston'57 having an aperture 58 arranged to register with. the aperture 7 is actuated through the movement of piston 57 in turn under control of piston 52, a screw 66 being provided for changing the areaof openin'g68 for controlling the air pressure in the chamber 54 during the return stroke of piston 52 and thereby preventing the immediate fall of the pressure in the. chamber 54 and too great variations in the fluctuation 0 the gauge.

In a typical example of operation the movement of the operating handle member 26. in a downward direction is effective to actuate the bars and the belt 27-28 carried thereby through the bell crank levers 40 and the supporting plates .19 and 20 through the connecting rods 24. The movement of one of the bell crank levers 40 through its armis eifective to impart movement to the piston '52 from position shown in Fig. 2 to position shown in Fig. 3 for pumping air in chamber 54 against the resistance, of thespring 67 holding the ball 68 against the valve seat. The resistance of spring 67 causes the operation of piston 57 position shown in Fig. 2 to position shown in Fig. 3 for closing the opening 59 and simultaneously causes the opening of valve 0U which opening is effected through the medium of spring .65 upon the release of the bell-shaped member 64 byarm 61. The continued movement of piston 52 is efiective to build up an air I pressure in the expansion chamber 54 which pressure is indicated by the gauge 55. But it is to be noted that the opening of outlet 63 is so adjusted as to preventthe building of a too high pressure in the chamber 54 and thus prevents a too great oscillation of the gauge pointer. Upon the beginning of thereturn or intake movement of piston 52 to normal the spring 67 forces the ball 68 against its seat and the continued movement of this piston is efiective to cause a vacuum in the cylinder 53 which vacuum causes the piston 57 to move from position shown in Fig. 3 to position as shown in Fig. 2 wherein the opening 58 of piston 57 registers with opening 59 of cylinder 159 and thus permitting the return stroke of the piston 52 to normal. The downward movement of the piston 57 and the arm 61 carried thereby is effective to operate the bell-shaped member 64 to partially close the opening 63 of the which would otherwise occur if this valve remained entirely open during this lapse of time. The flow of air through the opening the expansion chamber 54 which pressure would be indicated by the gauge pointer. Similarly, the uniform movement of the handle operating lever will be efiective to maintain the pressure in the pressure chamber 54 substantially constant for any pressure value and this condition will be indicated by the gauge pointer thus giving a positive indicationof the movement of the handle operating member.

4 What is claimed is:

1. In an indicator for a machine for mechanically inducing .artificial respiration, said indicator comprising a cylinder, a piston movable in said cylinder and actuated by said machine, an air inlet valve connecting with said cylinder and actuated upon a movement of said piston in said cylinder, a pressure chamber, a valve operable under the action of said piston upon both movements of the latter for admitting and retaining the air in said chamber, a two-way movable valve actuated one Way by the first mentioned valve for closing it and the other way automatically for controlling the pressure in said chamber and a gauge for indicating such a pressure.

2. In an indicator, a cylinder, a piston movable in said cylinder, an air inlet valve and an air outlet valve actuated according to the movement of said piston in said cylinder, a pressure chamber connected to the air outlet valve, another valve connected to said chamber, means carried by the air inlet valve for closing the last mentioned valve and automatically operable means for opening it upon .a certain operation of said piston in said cylinder for controlling the pressure in said chamber and a gauge connected to said chamber for indicating such a pressure.

In witness whereof, I hereunto subscribe my name, this 5th day of September, 1930.

HOWARD A. FLAMMER.

valve OU in order to maintain the air pressure in chamber 54 within a small pressure difference during the return stroke of the handle operating member 26 and the piston 52 connected thereto in order to prevent too violent oscillations of the gauge pointer

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