Chair Wheel Caster

Chair Wheel Caster
Why is a caster’s fork bent?

On a wheelchair, usually casters are placed in front so the wheel chair can turn.
If you look closely, the front caster’s fork are bent not straight.
Can anyone scientifically explain why it is designed this way?
Thanks for the answer. Do you think center of gravity has to do anything with the design?

This bending of the fork causes the caster to trail behind its swivel axis when the chair is pushed, meaning that the caster wheel automatically falls into line with the desired direction of motion and rolls easily and smoothly since the wheel is aligned in the direction of the push!

D’you need a deeper explanation?

Mesh Task Chair