Improvements in exercising apparatus for therapeutic purposes / [Max Herz].

  • Max Markus Herz
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in exercising apparatus for therapeutic purposes / [Max Herz]. Source: Wellcome Collection.

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    Herz’s Improvements in Exercising Apparatus for Therapeutic Purposes. the radii of the cam a1 corresponding to the various angular positions of the forearm, are determined so that the effort always remains the same. Instead of a weighted lever (Figs. 1 and 2) weights e (1 ig. 3) such as metal discs may he employed, these being suspended m number corresponding to'the desired work, on i cord, chain, or rope fastened to the periphery of the cam a 5 Fig. 4 represents an arrangement m which the weights e are on a lack 6 wl is pressed by a spring or weight against the periphery of a toothed cam a . In the arrangement shewn in Fig. 5 the weight £ takes the form of a roller mounted on a lever f and pressing on the periphery of the cam a. In the form of the apparatus partly shewn m Fig. G, the cam w is a cylmdnca 10 drum a3 in which is cut a helical groove g of varying depth the loaded lever cl is connected by a cord h fastened in the groove. ,, i r i In order that when the drum a3 rotates the cord b notwithstanding the helical form of the groove may always remain vertical, the shaft a lias a screw thread a° of the same pitch working in the bearing a4, so that the shaft as it rotates moves 15 also lengthwise. Dated this 4th day of September 1897. ABEL & IMBAY, Agents for the Applicant. COMPLETE SPECIFICATION. Improvements in Exercising Apparatus for Therapeutic Purposes. 20 I, Dr. Max Herz, of IX Schwarzspanierstrasse 18, Vienna, in the Austrian Empire, Physician, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement: — 25 Mechanico therapeutical apparatus such that the patient has to perform a definite and measurable amount of work by overcoming resistances in certain movements, are objectionable-, because the intensity of this work does not vary during the prescribed movement in accordance with the variation of the capacity of the muscles for work, as the part of the body which exerts the power changes 30 its position by the movement. Thus the forearm which in one part of its movement is extended, in another part is bent inwards on the elbow joint and in other positions of the muscles and joint different exertions of power are required to effect like results. The laws according to which the actions of the joints and muscles vary in 35 exerting power have hitherto been based only hypothetically on theoretical con¬ siderations and experiments on animals, and mechanico-therapeutic, apparatus have been constructed in accordance with these laws. 1 lie improvements forming the subject of the present invention have for their object to avoid the objection above stated and to ensure that, in working with such 40 apparatus during the whole movement the muscles shall be exerted in accordance with their momentary tension or pulling force. The. inventor has determined empirically the actual variations of the pulling f<u ee in human beings, and the resistance in his apparatus can be altered exactly according to these variations. caused to act upon a kinematic intermediate link or member the movement of which due to the motion of that part of the body which is exerting power produces a compensating alteration leverage. Such intermediate members are 45
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