During ascending a curb with a backward approach, when are the casters in contact with the upper surface?

During ascending a curb with a backward approach, when are the casters in contact with the upper surface?

• A. After rolling the whole wheelchair onto the sidewalk.
• B. After lifting the rear wheels and rolling backward until casters are on the upper surface.
• C. Immediately when the front casters touch the curb.
• D. Before lifting any wheels.

Answer: (B)

The key idea is sequencing for a stable transition onto the curb when using a backward approach. By backing up to the curb and then lifting the large rear wheels off the ground, you shift weight and control the climb so the front casters are the first part to contact and ride onto the upper surface as you roll backward. This timing helps keep the chair balanced, allows a smooth rise onto the sidewalk, and reduces the risk of tipping or losing control as you overcome the edge. If contact occurs too early or too late, stability is compromised.

The key idea is sequencing for a stable transition onto the curb when using a backward approach. By backing up to the curb and then lifting the large rear wheels off the ground, you shift weight and control the climb so the front casters are the first part to contact and ride onto the upper surface as you roll backward. This timing helps keep the chair balanced, allows a smooth rise onto the sidewalk, and reduces the risk of tipping or losing control as you overcome the edge. If contact occurs too early or too late, stability is compromised.