Push-pull wheeled luggage

Abstract

A wheeled luggage is configured to be pushed or pulled using a handle attached to the wheeled luggage. The wheeled luggage has a main luggage body with a plurality of fixed wheels and one or more swingable wheels in front of the plurality of fixed wheels. Each swingable wheel has an elongated neck attached to a front lower portion of the main luggage body, with a backward tilt due to a higher ground clearance in the front lower portion. This backward tilt enables a user to push the wheeled luggage ergonomically by applying force to the handle.

1 . A three-wheeled luggage case configured to be pushed and pulled by a user using a handle attached to the three-wheeled luggage case, the three-wheeled luggage case comprising:
 a main luggage body with a higher ground clearance in front relative to rear of the main luggage body, wherein the main luggage body is configured to contain items inside and the main luggage body is tilted backward by an elongated neck attached to a lower portion of the main luggage body and a swingable wheel;   a pair of fixed wheels located at a rear edge of the lower portion of the main luggage body, wherein each fixed wheel of the pair of fixed wheels stabilizes a straight path movement and a portion of each fixed wheel is configured to roll inside a corresponding wheel well carved into the main luggage body;   the swingable wheel located in front of the pair of fixed wheels, wherein the swingable wheel is equidistant from the pair of fixed wheels and the swingable wheel is configured to swing around an axis of rotation; and   the elongated neck comprising a triangular neck portion and an additional neck portion, wherein the triangular neck portion forms a perpendicular angle between the axis of rotation for the swingable wheel and a flat surface, and wherein the perpendicular angle between the axis of rotation for the swingable wheel and the flat surface is specifically used to optimize rotating forces to the swingable wheel for easy-swinging motions.   
   
   
       2 . The three-wheeled luggage case of  claim 1 , wherein the main luggage body tilted backward means that the main luggage body is tilted towards the user standing behind the three-wheeled luggage case because of the higher ground clearance in front due to the elongated neck attached to the lower portion of the main luggage body and the swingable wheel. 
   
   
       3 . The three-wheeled luggage case of  claim 1 , wherein the swingable wheel located in front of the pair of fixed wheels is configured to change its direction freely around the axis of rotation of the swingable wheel depending on a direction of a force applied by the user. 
   
   
       4 . The three-wheeled luggage case of  claim 1 , wherein each fixed wheel of the pair of fixed wheels is located partially inside the corresponding wheel well at each corner of the rear edge of the lower portion of the main luggage body. 
   
   
       5 . The three-wheeled luggage case of  claim 1 , wherein the swingable wheel enables the user to push the three-wheeled luggage case forward in any direction by applying a diagonal forward-downward force on the handle of the three-wheeled luggage case and wherein the pair of fixed wheels located at the rear edge of the lower portion of the main luggage body provides a straight-line stability. 
   
   
       6 . The three-wheeled luggage case of  claim 1 , wherein the three-wheeled luggage case can be pulled by the user by substantially tilting the main luggage body towards the user, thereby detaching the swingable wheel from the flat surface and relying only on the pair of fixed wheels for pulling movement of the wheeled luggage case. 
   
   
       7 . (canceled) 
   
   
       8 . The three-wheeled luggage case of  claim 1 , wherein the perpendicular angle between the axis of rotation of the swingable wheel and the flat surface accommodates smoother operation of the three-wheeled luggage case when the user applies a diagonal forward-downward force on the handle of the three-wheeled luggage case. 
   
   
       9 . A wheeled luggage case configured to be pushed and pulled by a user using a handle attached to the wheeled luggage case, the wheeled luggage case comprising:
 a main luggage body with a higher ground clearance in front relative to rear of the main luggage body, wherein the main luggage body is configured to contain items inside and the main luggage body is tilted backward by a plurality of elongated necks attached to a lower portion of the main luggage body and a plurality of swingable wheels;   a plurality of fixed wheels located at a rear bottom portion of the main luggage body, wherein each fixed wheel of the plurality of fixed wheels stabilizes a straight path movement and a portion of each fixed wheel configured to roll inside a corresponding wheel well carved into the main luggage body;   a plurality of swingable wheels located in front of the plurality of fixed wheels; wherein each of the plurality of swingable wheels is configured to swing around an axis of rotation; and   the plurality of elongated necks, each comprising a triangular neck portion and an additional neck portion, wherein the triangular neck portion forms a perpendicular angle between the axis of rotation for each of the plurality of swingable wheels and a flat surface, and wherein the perpendicular angle between the axis of rotation for each of the plurality of swingable wheels and the flat surface is specifically used to optimize rotating forces to each of the plurality of swingable wheels for easy-swinging motions.   
   
   
       10 . The wheeled luggage case of  claim 9 , wherein the main luggage body tilted backward means that the main luggage body is tilted towards the user standing behind the wheeled luggage case because of the higher ground clearance in front due to the plurality of elongated necks attached to the lower portion of the main luggage body and the plurality of swingable wheels. 
   
   
       11 . The wheeled luggage case of  claim 9 , wherein each of the plurality of swingable wheels located in front of the plurality of fixed wheels is configured to change its direction freely around the axis of rotation for each of the plurality of swingable wheels depending on a direction of a force applied by the user. 
   
   
       12 . The wheeled luggage case of  claim 9 , wherein each fixed wheel of the plurality of fixed wheels is located partially inside the corresponding wheel well at the rear bottom portion of the main luggage body. 
   
   
       13 . The wheeled luggage case of  claim 9 , wherein the plurality of swingable wheels enables the user to push the wheeled luggage case forward in any direction by applying a diagonal forward-downward force on the handle of the wheeled luggage, and wherein the plurality of fixed wheels located at the rear bottom portion of the main luggage body provides a straight-line stability. 
   
   
       14 . The wheeled luggage case of  claim 9 , wherein the wheeled luggage case can be pulled by the user by substantially tilting the main luggage body towards the user, thereby detaching the plurality of swingable wheels from the flat surface and relying only on the plurality of fixed wheels for pulling movement of the wheeled luggage case. 
   
   
       15 . (canceled) 
   
   
       16 . The wheeled luggage case of  claim 9 , wherein the perpendicular angle between each axis of rotation of the plurality of swingable wheels and the flat surface accommodates smoother operation of the wheeled luggage case when the user applies a diagonal forward-downward force on the handle of the wheeled luggage case. 
   
   
       17 . An elongated neck for a swingable wheel located at a lower front portion of a tilted wheeled luggage, the elongated neck comprising:
 a separate triangular neck portion for each swingable wheel, wherein a top surface of the separate triangular neck portion is attached to a bottom surface of the titled wheeled luggage and wherein the separate triangular neck portion enables an axis of rotation for the swingable wheel to make a perpendicular angle with a flat surface for the tilted wheeled luggage, and wherein the perpendicular angle between the axis of rotation for the swingable wheel and the flat surface is specifically used to optimize rotating forces to each of the plurality of swingable wheels for easy-swinging motions; and   an additional neck portion attached to a bottom surface of the triangular neck portion, wherein the additional neck portion configured to provide sufficient height to the tilted wheeled luggage for a higher front ground clearance than a rear ground clearance.   
   
   
       18 . (canceled) 
   
   
       19 . (canceled)