Multi-wheel system for luggage

A wheel system comprising:

• a leading wheel having a first diameter and a first focus,
• a central wheel having a second diameter and a second focus,
• a trailing wheel having a third diameter and a third focus,
• a rotating arm,
• a leading axle,
• a central axle,
• a trailing axle,
• wherein:
• the first diameter greater than the second diameter;
• the second diameter is greater than the third diameter;
• the rotating arm comprises a leading end and a trailing end;
• the leading axle rotatably couples the leading wheel to the leading end of the rotating arm;
• the trailing axle rotatably couples the trailing wheel to the trailing end of the rotating arm;
• the central wheel is rotatably coupled about the central axle;
• the rotating arm is rotatably coupled about the central axle;
• the central axle is located between the leading end and the trailing end;
• the central wheel is located on a first side of the rotating arm;
• the leading wheel and the trailing wheel are located on a second side of the rotating arm, opposite the first side;
• the wheel system defines a contact plane tangent to the leading wheel, the central wheel, and the trailing wheel;
• the rotating arm defines a reference plane extending through the first focus, the second focus, and the third focus;
• the first focus comprises a first focus height, the second focus comprises a second focus height, and the third focus comprises a third focus height;
• the first focus height, the second focus height, and the third focus height are measured as perpendicular distances between the contact plane and the first focus, the second focus, and the third focus, respectively;
• the first focus height is between 1.75 inches and 2.25 inches;
• the second focus height is between 1.25 inches and 1.75 inches;
• and
• the third focus height is between 0.75 inches and 1.25 inches.

A luggage bag comprising:

• a luggage body, a wheel well, a central axle, and a wheel system coupled to the luggage body by the central axle and housed within the wheel well;
• the wheel system comprising:
• a leading wheel having a first diameter and a first focus,
• a central wheel having a second diameter and a second focus,
• a trailing wheel having a third diameter and a third focus,
• a rotating arm,
• a leading axle,
• a trailing axle,
• wherein:
• the rotating arm is rotatably couple about the central axle;
• the central wheel is rotatably coupled about the central axle;
• the rotating arm comprises a leading end forward of the central axle and a trailing end rearward of the central axle;
• the leading axle rotatably couples the leading wheel to the leading end of the rotating arm;
• the trailing axle rotatably couples the trailing wheel to the trailing end of the rotating arm;
• the central wheel is located on a first side of the rotating arm;
• the leading wheel and the trailing wheel are located on a second side of the rotating arm, opposite the first side;
• the first diameter is greater than the second diameter;
• the second diameter is greater than the third diameter;
• the rotating arm defines a reference plane extending through the first focus, the second focus, and the third focus;
• the wheel system defines a contact plane tangent to the leading wheel, the central wheel, and the trailing wheel;
• the reference plane and the contact plane form an acute angle.