Undertaking
Patent
1982-04-12
1984-06-05
Hafer, Robert A.
Undertaking
272129, 310 75B, A63B 2124, H02K 710
Patent
active
044524455
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a loading or stress-inducing device for physiological examinations, which device has a shaft driven by the person to be examined, a drive with a free wheel, a transmission gear, a fly wheel mass which is coupled with the acceleration side of the transmission gear, a follower electric motor in brake operation and to which are connected externally electrical control and loading circuits.
In a physician's practice increasingly examination methods are used in which not only static but also dynamic values are determined under load. The dynamic values play an important role in the prophylatic and rehabilitation diagnostics, as well as in general, sports related or work related medical diagnostics. The load or stress is advantageously produced by pedaling or bicycling which subjects old or young or experienced as well as inexperienced patients to the same load. The bicycling can be accomplished either lying down or standing up.
The general demands made upon loading or stress-inducing systems are: variable loading, no harmful effects, interruption at random and, they must be physiological and reproducible.
A special advantage is a feedback if the loading system can be controlled by the functional parameters, such as breathing, EKG, blood pressure, etc. On the basis of present knowledge the following technical solutions are used for producing the load: eddy current brake, electric motor in brake operation, a dynamo-motor-tachometer system, scale motor, mechanical braking, etc. The disadvantages of the above mentioned variations are; a sturdy structure, high production cost, large basic friction, force or restraining systems due to the characteristics of rotational machines, high current consumption, and loading that is dependent on the number of revolutions.
Of several known physiological loading units those distributed by MEDICOR-WERKE (unit KE21) should be mentioned. In this unit via a pedal drive and by means of a free wheel, a fly wheel mass and finally an electric motor of a specific structure is driven in brake operation. The electro-motor is connected to external control and loading circuits by means of which the desired load is adjusted, that is, the compensation for internal friction is accomplished, which may amount to 40 to 50 watts. The heretofore known devices are, although they perform their basic function, disadvantageous in that they are too heavy so that their handling and transport is made difficult and in that for compensating for the interior friction extensive solutions are required whose accuracy is not always sufficient.
It is, therefore, an object of the present invention to produce a physiological loading unit of the type mentioned above which is simple in structure and has a small inner friction.
The physiological loading unit according to the present invention comprises a shaft driven by the person to be examined, said shaft being provided with a free wheel, a transmission gear, a fly wheel mass which is coupled to the acceleration side of the transmission gear or with an electro motor in brake operation. External electrical control and loading circuits are connected to the electro motor. Furthermore, the drive shaft is connected via a free wheel to a drum wheel with internal gearing and the interior of which is provided with several intermediate gears of equal size and with equal number of teeth and which are evenly distributed along a circle. The intermediate gears are coupled to a pinion which is arranged on the drive shaft. The rotor of the electro motor is arranged on the internal shaft so that it simultaneously forms the fly wheel mass. The stator of the electro motor is located next to the drum wheel with interior gearing and carries a polyphase winding which is connected to the electric loading circuit. Furthermore, the rotor windings are connected to the external control circuit by means of sliding contacts. In order to achieve a better utilization of space the rotor is designed such that the iron core consists of two overlapping halves which are bent tow
REFERENCES:
patent: 2195328 (1940-03-01), Eaton
patent: 4084810 (1978-04-01), Forsman
Hafer Robert A.
Handal Anthony H.
Kramer Arnold W.
Medicor Muvek
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