US Patent 11673594 Swing caster dolly

A wheel dolly is disclosed that includes a first and a second swing caster assembly. Each swing caster assembly includes a stationary frame supporting a swing axle and a lift bar channel, a swing frame constructed to rotate about the swing axle, thus defining a swing plane, and a swivel caster connected to the swing frame. A lift bar with a first longitudinal member extending orthogonally away from a second longitudinal member is connected to both swing caster assemblies through the lift bar channel. The swing plane of the first swing caster assembly is orthogonal to the swing plane of the second swing caster assembly, when the assemblies are mounted to the lift arm.