Buckle strap adjustment assembly for safety helmets

Abstract

A buckle strap adjustment assembly for safety helmets is adapted for being installed in a safety helmet with a buckle strap. The buckle strap adjustment assembly includes two positioning elements and a fixing element. One end of each positioning element is fixed in the safety helmet and the fixing element is detachably combined with the other end of each positioning element. The fixing element has a body portion which has first through-holes in each of two sides thereof for the buckle strap passing through. Basing on the above structure, the present invention can effectively avoid that the safety helmet slips up and down.

1 . A buckle strap adjustment assembly for safety helmets which is installed in a safety helmet with a buckle strap, comprising:
 two positioning elements, one end of each positioning element fixed in the safety helmet; and   a fixing element, detachably combined with the other end of each positioning element, having a body portion which has two left-to-right adjacent first through-holes in each of two sides thereof to pass through the buckle strap.   
   
   
       2 . The buckle strap adjustment assembly as claimed in  claim 1 , wherein the buckle strap has at least one rear strap which passes through the first through-holes of the fixing element. 
   
   
       3 . The buckle strap adjustment assembly as claimed in  claim 2 , wherein each positioning element has a sheet portion, an embedded portion protruding out of an end portion of the sheet portion and a first fastening portion formed in the other end portion of the sheet portion, relative to the embedded portion, the embedded portion being embedded in the safety helmet; and the fixing element having two second fastening portions engaging with the first fastening portions of the two positioning elements. 
   
   
       4 . The buckle strap adjustment assembly as claimed in  claim 3 , wherein the fixing element has two protruding pieces extending out of a lateral edge of the body portion, each of which has one of the second fastening portions formed thereon. 
   
   
       5 . The buckle strap adjustment assembly as claimed in  claim 3 , wherein each first fastening portion includes a plurality of fastening holes and each second fastening portion includes a plurality fastening pins. 
   
   
       6 . The buckle strap adjustment assembly as claimed in  claim 3 , further comprising:
 an annular strap, mounted in the safety helmet and having two end portions, each end portion having a slot formed in an extremity thereof and each slot having a serrated portion on one of its inner walls; and   a lacing and locking mechanism comprising:   a base, having a circular groove, a second through-hole and two openings connected with the circular groove, wherein a plurality of locking teeth protrude from a side wall of the circular groove and a pivot pin protrudes out of a bottom wall of the circular groove, the second through-hole extends through the pivot pin and the base, and the two end portions of the annular strap pass through the two openings of the base, and the pivot pin passes through each slot of the annular strap;   a driven element, having a main body, a gear protruding out of an end surface of the main body, a plurality of elastic arms respectively extending from lateral edges of the main body and a plurality of locking portions respectively formed on outside edges of the elastic arms, wherein an end of each elastic arm is bent and extended towards the main body  421  to form a blocking arm, the driven element further has a pivot hole extending through the main body and the gear, the pivot pin of the base pivotally engages with the pivot hole, the gear engages with the serrated portions of the annular strap, and each locking portion abuts against a locking tooth of the base;   an adjustment wheel, having a shaft portion and a plurality of guiding pins which protrude from the adjustment wheel, wherein the shaft portion has a locking hole and is pivotally inserted in the second through-hole of the base, and each guiding pin is inserted in a corresponding space defined by an corresponding elastic arm, a corresponding blocking arm and the main body;   a connecting board, located on the body portion of the fixing element, having a third through-hole; and   a fixing assembly, passing through the third through-hole of the connecting board and the second through-hole of the base, further extending into the locking hole of the adjustment wheel for locating the adjustment wheel and mounting the base on an outside edge of the connecting board.   
   
   
       7 . The buckle strap adjustment assembly as claimed in  claim 6 , wherein the connecting board is integrally connected with the body portion of the fixing element. 
   
   
       8 . The buckle strap adjustment assembly as claimed in  claim 6 , wherein the connecting board and the fixing element are separate components, and the connecting board is joint on the body portion of the fixing element.