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Volume 9, issue 2 | Copyright
Mech. Sci., 9, 359-371, 2018
https://doi.org/10.5194/ms-9-359-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 Nov 2018

Research article | 08 Nov 2018

A new manual wheelchair propulsion system with self-locking capability on ramps

Gaspar Rodríguez Jiménez1, David Rodríguez Salgado1, Francisco Javier Alonso1, and José María del Castillo2 Gaspar Rodríguez Jiménez et al.
  • 1Department of Mechanical Engineering, University of Extremadura, Badajoz, 06006, Spain
  • 2Department of Material Science and Transportation Engineering, University of Seville, Badajoz, 41092, Spain

Abstract. A wheelchair user faces many difficulties in their everyday attempts to use ramps, especially those of some length. The present work describes the design and build of a propulsion system for manual wheelchairs for use in ascending or descending long ramps. The design is characterized by a self-locking mechanism that activates automatically to brake the chair when the user stops pushing. The system consists of a planetary transmission with a self-locking capacity coupled to a push rim with which the user moves the system. Different transmission ratios are proposed, adapted to the slope and to the user's physical capacity (measured as the power the user can apply over ample time periods). The design is shown to be viable in terms of resistance, and approximate dimensions are established for the height and width of the propulsion system. Also, a prototype was built in order to test the self-locking system on ramps.

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The present work describes the design and build of a new completely mechanical propulsion system for manual wheelchairs for use in ascending or descending long ramps. The design is characterized by a self-locking mechanism that activates automatically to brake the chair when the user stops pushing. The main component of the propulsion system is a planetary gear train that can self-lock, this means that the user does not need to activate external brakes.
The present work describes the design and build of a new completely mechanical propulsion system...
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