A prosthetic hand structure (100) comprises at least one mechanical finger (110a-e) comprising in turn a metacarpal support (111) and a proximal stiff link (112) connected to the metacarpal, support (111) by a proximal cylindrical joint (113). The proximal stiff link (112) is arranged to carry out a rotation of predetermined amplitude (φ) with respect to the metacarpal support (111) about an axis (113') of the proximal cylindrical joint (113). The mechanical finger (110a-e) also comprises a transmission member (116, 117) connected to the proximal stiff link (112). The transmission member (116, 117) is adapted to actuate the proximal stiff link (112) for causing the above described rotation of predetermined amplitude (φ). In particular, the transmission member (116, 117) comprises a worm screw (116) integral to the proximal stiff link (112) and is arranged for carrying out a rotation about a longitudinal axis (116') of the worm screw (116). The transmission member (116, 117) comprises also a flexible rack (117) having a first end portion (117a), pivotally connected to the metacarpal support (111), and a second end portion (117b) arranged to engage with the threaded profile of the worm screw (116) at an engagement zone (P) of the flexible rack (117). It is provided an actuator (118) mounted to the mechanical finger (110a-110e) and to actuate the worm screw (116), causing it to rotate about its rotation axis (116' ), in such a way that, when the actuator (118) moves the worm screw (116), there is a moving away/approaching movement of the engagement zone (P) away from/towards the first end (117a), with subsequent rotation of predetermined amplitude (φ), in a direction of rotation, or in the opposite direction, of the proximal stiff link (112) about its axis (113'), corresponding to the extension/flexion movement of the mechanical finger (110a-110e).


    Access

    Download


    Export, share and cite



    Title :

    Prosthetic hand system



    Publication date :

    2015-01-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English , French , German


    Classification :

    DDC:    629



    Prosthetic hand system

    LEONARD BRADEN WILLIAM THOMAS / REYES MANUEL / MOY JR DAVID THOMAS | European Patent Office | 2021

    Free access

    Compact prosthetic hand

    Mann, W. A. / Wiker, G. A. | NTRS | 1977


    Rotationally Actuated Prosthetic Hand

    Norton, William E. / Belcher, Jewell G., Jr. / Carden, James R. et al. | NTRS | 1991


    Prosthetic Hand Lifts Heavy Loads

    Carden, James R. / Norton, William / Belcher, Jewell G. et al. | NTRS | 1991