Helmet having removable jaw guard

Abstract

A helmet having a removable jaw guard is disclosed. In the helmet having a removable jaw guard, the locking means comprises a pair of left and right locking brackets 510 attached symmetrically to both insides of the helmet body 1 and having locking bars 511 respectively, latches 520 on both the left and right sides engaged with the locking bars 511 of the locking brackets 510 , latch plates 530 on which the latches 520 are fitted rotatably at a predetermined angle by a pivot 522 , a return spring 540 of which one end is connected to the upper end of the latch 520 and the other end is connected to the latch plate 530 , a connecting bar 550 in which the extending portions 551 of both ends are connected to the ends of latches 520 , and an unlock lever 570 to pull the middle of the connecting bar 550 forward.

1 . A helmet having a removable jaw guard which is opened and closed by a hinge means for protecting the wearer by covering part of an opening of a helmet body, and which has a locking means for maintaining the locking condition, the locking means comprising: 
 a pair of left and right locking brackets  510  attached symmetrically to both insides of the helmet body  1  and having locking bars  511  respectively;    latches  520  on both the left and right sides engaged with the locking bars  511  of said locking brackets  510 ;    latch plates  530  on which said latches  520  are fitted rotatably at a predetermined angle by a pivot  522 ;    a return spring  540  of which one end is connected to the upper end of said latch  520  and the other end is connected to said latch plate  530  so as to return latches  520  to the original position when unlocked;    a connecting bar  550  in which the extending portions  551  of both ends are connected to the ends of latches  520  and are arranged in arc shape along the front inside of said jaw guard  4  in order to operate simultaneously said latches  520  on both the left and right sides; and    an unlock lever  570  which is crossed longitudinally to pull the middle of said connecting bar  550  forward, and of which the upper end is connected to the inside of said jaw guard  4  by a hinge lever  560  and the lower end is extended downward to be partly exposed below said jaw guard  4 .    
   
   
       2 . The helmet according to  claim 1 , wherein the hook  521  of said latch  520  rotates within a predetermined range of angle around said pivot  522 , and rotates upward in the direction of the rotation of the jaw guard  4  during unlocking.  
   
   
       3 . The helmet according to  claim 1 , wherein the hinge means comprising hinge holes  1   a  formed on the side of said helmet body  1  corresponding to the shaft holes  41  formed on the left and right extending portions  40  of said jaw guard  4 , hooking protuberances  42  formed on the inside of said shaft holes  41 , support holes  1   b  formed in said hinge holes  1   a , and a screw shaft  410  inserted into said hinge holes  1   a  to maintain open condition.