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

  • Herz, Max.
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. cams or their equivalents such as unround discs, unround wheels grooved cylinders and the like. In the drawings accompanying my Provisional Specification Figs. 1 and 2, are respectively a side and a front elevation of an apparatus according to my inven- 5 tion for mechanico therapeutical treatment of the arm. Figs. 3, 4, 5 and 6, shew modified arrangements of parts of the apparatus. A is a standard or frame on the upper portion of which a shaft a with crank handle c is mounted the shaft carrying the compensating kinematic intermediate member which is a cam a1 or unround disc capable of rotation. A lever d 10 pivotted on the frame A, and loaded by a weight e, is connected by a cord, chain, rope or strap b to the periphery of the cam a1. By shifting the weight e along the lever d the work performed by turning the crank handle cx can be varied as desired. If for instance the work consists in turning the crank cl in the direction of the arrow Fig. 1, so raising the weight e by moving the fore arm at the elbow joint, P* the radii of the cam a1 corresponding to the various angular positions of the forearm, are determined empirically so that the effort always remains the same. Instead of a weighted lever (Figs. 1 and 2) weights e1 (Fig. 3) such as metal discs may be employed, these being suspended in number corresponding to the desired work, on a cord, chain, or rope fastened to the periphery of the cam a1. 20 Fig. 4 represents an arrangement in which the weights e2 are on a rack bl which is pressed by a spring or weight against the periphery of a toothed cam a2. In the arrangement shewn in Fig. 5 the weight e3 takes the form of a roller mounted on a lever f and pressing on the periphery of the cam a1. In the form of the apparatus partly sliewp. in Fig. 6, the cam a1 is replaced by a 25 cylindrical drum a3 in which is cut a helical groove g of varying depth the loaded lever d is connected by a cord c fastened in the groove. 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 has a screw thread a5 of the same pitch working in the bearing a4, so that the shaft as it rotates moves 30 also lengtlrwise. Having now particularly described and ascertained the nature of this inven¬ tion and in what manner the same is to be performed, I declare that what I claim is: — Exercising apparatus for therapeutical purposes wherein an intermediate 35 kinematic member such as a cam or unround disc such as a1, or unround wheel such as <72, or a drum such as a3 with a groove of varying depth, is provided, upon which the resistance acts and by the movement of which the length of leverage of the load is so varied as to compensate for the empirically determined inequalities of muscular strain due to the varying positions of the part of the 40 body by which force is exerted, substantially as described. Dated this 17th day of May 1898. ABEL & I MR AY, Agents for the Applicant. Rcdhill : Printed for Her Majesty’s Stationery Office, by Malcomson & Co., Ltd.—1898