US 12,239,586 B2
Mechanical wheelchair drive and wheelchair having such a mechanical wheelchair drive
Margit Gfoehler, Vienna (AT); Nithin Babu Rajendra Kurup, Vienna (AT); and Markus Puchinger, Vienna (AT)
Assigned to TECHNISCHE UNIVERSITAET WIEN, Vienna (AT)
Appl. No. 17/260,980
Filed by TECHNISCHE UNIVERSITAET WIEN, Vienna (AT)
PCT Filed Jul. 16, 2019, PCT No. PCT/AT2019/060235
§ 371(c)(1), (2) Date Jan. 15, 2021,
PCT Pub. No. WO2020/014720, PCT Pub. Date Jan. 23, 2020.
Claims priority of application No. A 50609/2018 (AT), filed on Jul. 16, 2018.
Prior Publication US 2021/0290458 A1, Sep. 23, 2021
Int. Cl. A61G 5/02 (2006.01); A61G 5/10 (2006.01); A61G 5/12 (2006.01); B62M 3/06 (2006.01)
CPC A61G 5/026 (2013.01) [A61G 5/027 (2013.01); A61G 5/1005 (2013.01); A61G 5/125 (2016.11)] 16 Claims
OG exemplary drawing
 
1. Mechanical wheelchair drive comprising a rotatably mounted lever, a handle fastened to the lever and a force transfer unit configured to transfer a rotational motion of the lever to a wheelchair wheel, wherein the lever has a variable length and can be guided along a closed guide of a guide plate, which guide deviates from the circular form, so that a length variation of the lever takes place during the rotational motion, wherein the guide corresponds to a droplet-shaped closed curve having a wide end curve region and a narrow end curve region, wherein the end curve regions each have a vertex point and the narrow end curve region of the closed curve in a mounted state of the wheelchair drive points in a direction towards a backrest of a wheelchair in a mounted state of the wheelchair drive, a longitudinal axis running between the vertex points of the wide end curve region and the narrow end curve region is inclined by at least 5° but no more than 30° with respect to the horizontal, and wherein the curve can be described by the following mathematical equations:

OG Complex Work Unit Math
wherein θ corresponds to an angle, the coordinates X and Y describe the course of the guide in a Cartesian coordinate system, the parameter β is specified between −20° and 30°, the parameters A and B are specified between 0.01 m and 0.25 m and the parameter n is specified between 0.2 and 0.9.