Wheel with movable elements

A transport means comprising at least two wheels, wherein each wheel has a curvature radius, and comprises:

• a supporting frame, including a central portion having a center around which said wheel can turn, and at least one plurality of radial portions, extending from said central portion angularly displaced with each other, at least one housing seat being delimited between two adjacent radial portions;
• at least one movable element, housed in a respective housing seat and radially displaceable between a first working position, wherein the at least one movable element is located at a maximum distance with respect to said center, and a second working position, wherein the at least one movable element is located at a minimum distance with respect to said center of said central portion,
• said at least one plurality of radial portions and said at least one movable element having respective distal sections, with respect to said center, curved with a curvature radius corresponding to the curvature radius of said wheel and being flush with each other, when said at least one movable element is located in said first working position, thereby delimiting a circular perimeter of said wheel;
• a locking element for said at least one movable element, displaceable between one locking position, wherein the locking element abuts on said at least one movable element and prevents the radial displacement thereof, and one unlocking position, wherein the locking element allows the radial displacement of said at least one movable element toward said second working position;
• a returning element of said at least one movable element, disposed between said supporting frame and said at least one movable element, said returning element being configured to bring said at least one movable element back into said first working position;
• and
• a band made of an elastically deformable material, surrounding said distal sections of said at least one plurality of radial portions and said at least one movable element, at said circular perimeter of said wheel;
• wherein said transport means is one of:
• a wheelchair, a stretcher, a baby carriage, a stroller, a parallel wheeled scooter, a cart, and a robot having two wheels.