Push-pull wheeled luggage with swingable rear wheels and at least one fixed front wheel

Abstract

A wheeled luggage is configured to be pushed or pulled using a handle attached to the wheeled luggage. This “push-pull” wheeled luggage has a main luggage body with one or more swingable rear wheels at a rear edge of a lower portion of the main luggage body and one or more fixed front wheels in front of the one or more swingable rear wheels. Each front wheel has an elongated neck attached to a front lower portion of the main luggage body, which creates a backward tilt due to a higher ground clearance in the front lower portion. Each swingable rear wheel is configured to receive a directional force to steer the push-pull wheeled luggage. The backward tilt created by the elongated neck attached to the front lower portion of the main luggage body enables a user to push the push-pull wheeled luggage ergonomically by applying a forward-downward force to the handle.

1 . A push-pull wheeled luggage case configured to be pushed and pulled by a user using a handle attached to the push-pull wheeled luggage case, the push-pull 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;   a pair of swingable rear wheels located at a rear lower portion of the main luggage body, wherein each swingable rear wheel is configured to rotate around a vertical axis for a horizontally circular swinging motion based on a directional force applied by the user;   a fixed front wheel located in front of the pair of swingable rear wheels, wherein an elongated neck of the fixed front wheel attached to a front lower portion of the main luggage body provides the higher ground clearance in the front relative to the rear of the main luggage body, thereby tilting the main luggage body backward when the pair of swingable rear wheels and the fixed wheel are touching a flat surface.   
   
   
       2 . The push-pull wheeled luggage case of  claim 1 , wherein tilting the main luggage body backward means that the main luggage body is tilted towards the user standing behind the push-pull wheeled luggage case. 
   
   
       3 . The push-pull wheeled luggage case of  claim 1 , wherein the vertical axis for the horizontally circular swinging motion for each swingable rear wheel is provided by a swingable neck attached to the rear lower portion of the main luggage body. 
   
   
       4 . The push-pull wheeled luggage case of  claim 1 , wherein each swingable rear wheel of the pair of swingable rear wheels is located at each corner of the rear lower portion of the main luggage body. 
   
   
       5 . The push-pull wheeled luggage case of  claim 1 , wherein the pair of swingable rear wheels enables the user to push the push-pull wheeled luggage case to a desired direction by applying a diagonal forward-downward force on the handle of the push-pull wheeled luggage case and wherein the fixed front wheel located in front of the swingable rear wheels provides a straight-line stability. 
   
   
       6 . The push-pull wheeled luggage case of  claim 2 , wherein the push-pull wheeled luggage case can be pulled by the user by further tilting the main luggage body towards the user, thereby detaching the fixed front wheel from the flat surface and relying only on the pair of swingable rear wheels for pulling movement of the push-pull wheeled luggage case. 
   
   
       7 . A push-pull wheeled luggage case configured to be pushed and pulled by a user using a handle attached to the push-pull wheeled luggage case, the push-pull 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;   one or more swingable rear wheels located at a rear lower portion of the main luggage body, wherein each swingable rear wheel is configured to change its direction based on a user's directional force applied to the handle attached to the luggage case; and   one or more fixed front wheels located in front of the one or more swingable rear wheels, wherein an elongated neck for each fixed front wheel attached to a front lower portion of the main luggage body provides the higher ground clearance relative to the one or more swingable rear wheels at the rear lower portion of the main luggage body, thereby tilting the main luggage body backward when the one or more swingable rear wheels and the one or more fixed front wheels are touching a flat surface.   
   
   
       8 . The push-pull wheeled luggage case of  claim 7 , wherein tilting the main luggage body backward means that the main luggage body is tilted towards the user standing behind the push-pull wheeled luggage case. 
   
   
       9 . The push-pull wheeled luggage case of  claim 7 , wherein the one or more swingable rear wheels are located near at least one corner of the rear lower portion of the main luggage body. 
   
   
       10 . The push-pull wheeled luggage case of  claim 7 , wherein the one or more swingable rear wheels enable the user to push the push-pull wheeled luggage case to a desired direction by applying a diagonal forward-downward force on the handle of the push-pull wheeled luggage case and wherein the one or more fixed front wheels located in front of the swingable rear wheels provide a straight-line stability. 
   
   
       11 . The push-pull wheeled luggage case of  claim 8 , wherein the push-pull wheeled luggage case can be pulled by the user by further tilting the main luggage body towards the user, thereby detaching the one or more fixed front wheels from the flat surface and relying only on the one or more swingable rear wheels for pulling movement of the push-pull wheeled luggage case. 
   
   
       12 . A push-pull wheeled luggage case configured to be pushed and pulled by a user using a handle attached to the push-pull wheeled luggage case, the push-pull 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;   one or more swingable rear wheels located at a rear lower portion of the main luggage body, wherein each swingable rear wheel is configured to change its direction based on a user's directional force applied to the handle attached to the luggage case;   a plurality of fixed front wheels located in front of the one or more swingable rear wheels, wherein an axle going through the plurality of fixed front wheels provides a common axis of rotation for the plurality of fixed front wheels;   one or more elongated necks attached to the plurality of fixed front wheels and a front lower portion of the main luggage body, wherein the one or more elongated necks for the plurality of fixed front wheels provide a higher ground clearance relative to the one or more swingable rear wheels at the rear lower portion of the main luggage body, thereby tilting the main luggage body backward when the one or more swingable rear wheels and the plurality of fixed front wheels are touching a flat surface.   
   
   
       13 . The push-pull wheeled luggage case of  claim 12 , wherein tilting the main luggage body backward means that the main luggage body is tilted towards the user standing behind the push-pull wheeled luggage case. 
   
   
       14 . The push-pull wheeled luggage case of  claim 12 , wherein the one or more swingable rear wheels are located near at least one corner of the rear lower portion of the main luggage body. 
   
   
       15 . The push-pull wheeled luggage case of  claim 12 , wherein the one or more swingable rear wheels enable the user to push the push-pull wheeled luggage case to a desired direction by applying a diagonal forward-downward force on the handle of the push-pull wheeled luggage case and wherein the plurality of fixed front wheels located in front of the swingable rear wheels provide a straight-line stability. 
   
   
       16 . The push-pull wheeled luggage case of  claim 13 , wherein the push-pull wheeled luggage case can be pulled by the user by further tilting the main luggage body towards the user, thereby detaching the plurality of fixed front wheels from the flat surface and relying only on the one or more swingable rear wheels for pulling movement of the push-pull wheeled luggage case.