US Patent 9545941 Infant stroller apparatus

An infant stroller apparatus includes a stroller frame having a leg frame, a stand platform pivotally connected with the leg frame about a pivot axis, and a spring connected with the leg frame. The stand platform is connected with a caster assembly disposed rearward relative to the pivot axis. The spring is configured to bias the stand platform in a direction for displacing the caster assembly downward. In some embodiment, the infant stroller apparatus can include a brake assembly operable to lift the caster assembly of the stand platform in a braking state.