Helmet liner

Abstract

A helmet liner includes an outer protective layer, an inner protective layer and a plurality of breakable connecting members. The outer protective layer has a first base layer and a plurality of first bulges. The plural first bulges are provided on the first base layer and located at the inner side of the first base layer. The inner protective layer has a second base layer and a plurality of second bulges. The plural second bulges provided on the second base layer and located at the outer side of the second base layer. The plural connecting members are connected between the first bulges and the second bulges so as to endow the helmet liner with reliable impact-absorbing capacity and ensure safety of helmet wearers.

What is claimed is: 
     
         1 . A helmet liner, comprising:
 an outer protective layer, being made of thermoplastic, the outer protective layer having a first base layer and a plurality of first bulges, the first bulges being provided on the first base layer and located at an inner side of the first base layer;   an inner protective layer, being located at an inner side of the outer protective layer and separated from the outer protective layer by a predetermined distance, the inner protective layer being made of thermoplastic, the inner protective layer having a second base layer and a plurality of second bulges, the second bulges being provided on the second base layer and located at an outer side of the second base layer; and   a plurality of breakable connecting members, being made of thermoplastic, the connecting members having a predetermined length, the predetermined length being smaller than the predetermined distance, and the connecting members being connected between the first bulges and the second bulges;   wherein, when the outer protective layer receives an external inward force that is smaller than a predetermined pressure, the first base layer deforms and drives the first bulges to move from a first position to a second position with the connecting members remaining unbroken, and when the external force is greater than the predetermined pressure, the connecting members break.   
     
     
         2 . The helmet liner of  claim 1 , wherein the predetermined pressure is 1.1 Mpa. 
     
     
         3 . The helmet liner of  claim 1 , wherein each of the first bulges and each of the second bulges have their site projections overlapping each other. 
     
     
         4 . The helmet liner of  claim 1 , wherein each of the first bulges and each of the second bulges have their site projections not overlapping each other. 
     
     
         5 . The helmet liner of  claim 1 , wherein the connecting members are connected to tops of the first and second bulges. 
     
     
         6 . The helmet liner of  claim 1 , wherein the connecting members are arranged unidirectionally. 
     
     
         7 . The helmet liner of  claim 1 , wherein the connecting members are connected to the first and second bulges in a one-to-one or one-to-many manner. 
     
     
         8 . The helmet liner of  claim 1 , wherein in each of the first bulges a width at its end near the first base layer is greater than a width at its end far from the first base layer, and in each of the second bulges a width at its end near the second base layer is greater than a width at its end far from the second base layer. 
     
     
         9 . The helmet liner of  claim 1 , wherein the first bulges move from the first position to the second position in a manner that with the first bulge moving the earliest defined as a central bulge, the other first bulges move from the first position to the second position in an inside-out sequence against the central bulge. 
     
     
         10 . The helmet liner of  claim 1 , wherein when the external force is greater than the predetermined pressure, the first bulges moves from the second position to a third position, so that the first bulges abut against the second base layer and the second bulges abut against the first base layer. 
     
     
         11 . The helmet liner of  claim 1 , wherein when the external force is greater than the predetermined pressure, the first bulges moves from the second position to a third position, so that the first bulges do not abut against the second base layer and the second bulges abut against the first base layer. 
     
     
         12 . The helmet liner of  claim 1 , wherein when the external force is greater than the predetermined pressure, the first bulges moves from the second position to a third position, so that the first bulges abut against the second base layer and the second bulges do not abut against the first base layer.