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

2018 ◽  
Vol 9 (2) ◽  
pp. 359-371
Author(s):  
Gaspar Rodríguez Jiménez ◽  
David Rodríguez Salgado ◽  
Francisco Javier Alonso ◽  
José María del Castillo
Keyword(s):  
Physical Capacity ◽  
Propulsion System ◽  
The Self ◽  
Wheelchair Propulsion ◽  
Wheelchair User ◽  
Manual Wheelchair ◽  
Locking Mechanism ◽  
Time Periods ◽  
Manual Wheelchairs ◽  
Planetary Transmission

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.

General Uncertainty Analysis for Manual Wheelchair Propulsion Dynamics and Development of an Instrumented Wheel

2006 ◽  
Vol 1 (2) ◽  
pp. 140-150
Author(s):  
M. Mallakzadeh ◽  
F. Sassani
Keyword(s):  
Uncertainty Analysis ◽  
Angular Position ◽  
Three Dimensional ◽  
Published Data ◽  
Wheelchair Propulsion ◽  
Wheelchair User ◽  
Wheelchair Users ◽  
Manual Wheelchair ◽  
Taylor Series Expansions ◽  
Propulsion Phase

Manual wheelchair propulsion (MWP) is an inefficient and physically straining process. A reliably fabricated and instrumented wheel can help researchers to accurately calculate the forces and moments exerted by the wheelchair users and propose strategies to improve MWP. In this study, an instrumented wheel is designed, fabricated, and validated by using general uncertainty analysis. A six-component transducer is used to measure three-dimensional forces and moments applied by the wheelchair user on the handrim. The output of the transducer are forces and moments, which are directly transmitted to a PC using a USB port. By developing the transformation equations, the actual forces and moments on the hand of the wheelchair user are calculated. The angular position of the hand on the handrim is calculated from the kinetic data obtained through the instrumented wheel, and the derived equations. The general uncertainty analysis method is used to calculate the uncertainty values for the variables of interest with the Taylor series expansions. An analysis of the results shows that it is possible to obtain reliable information for MWP by using the instrumented wheel. Most of the data have uncertainties under 5% during much of the propulsion phase, and the patterns and overall behavior of the results are comparable to published data.

Effect of increased load on scapular kinematics during manual wheelchair propulsion in individuals with paraplegia and tetraplegia

2012 ◽  
Vol 31 (2) ◽  
pp. 397-407 ◽  
Author(s):  
Shashank Raina ◽  
Jill L. McNitt-Gray ◽  
Sara Mulroy ◽  
Philip S. Requejo
Keyword(s):  
Wheelchair Propulsion ◽  
Manual Wheelchair ◽  
Scapular Kinematics

Biomechanics of Manual Wheelchair Propulsion in Elderly

2002 ◽  
Vol 81 (2) ◽  
pp. 94-100 ◽  
Author(s):  
Rachid Aissaoui ◽  
Hossein Arabi ◽  
Michèle Lacoste ◽  
Vincent Zalzal ◽  
Jean Dansereau
Keyword(s):  
Wheelchair Propulsion ◽  
Manual Wheelchair

scholarly journals Accelerometer output and its association with energy expenditure during manual wheelchair propulsion

Spinal Cord ◽  
2015 ◽  
Vol 54 (2) ◽  
pp. 110-114 ◽  
Author(s):  
Y C Learmonth ◽  
D Kinnett-Hopkins ◽  
I M Rice ◽  
J L Dysterheft ◽  
R W Motl
Keyword(s):  
Energy Expenditure ◽  
Wheelchair Propulsion ◽  
Manual Wheelchair
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