Structure for safety helmet

Abstract

A structure for a safety helmet comprising an extendable/retractable visor. The visor is connected on each side by a connective part to a slotted moveable seat having a saw-tooth shaped position-limiting slot engaging a protrusion to control the position of the visor. The moveable seat is connected to a connective portion having a shaft with one or more protrusions engaging a connective hole with one or more indentations on the moveable seat. A seating unit having one or more engagement elements for affixation to the helmet is connected via a slot to a protrusion on the inside of a push seat. The protrusion has a threaded hole which engages the connective hole of the connective portion and is fastened thereto, e.g. by a screw. Upon assembly and fixation to the helmet, the visor may be extended or retracted by pushing on the push seat.

1 . A structure for a safety helmet, comprising:
 a visor having a connective part disposed on each side thereof and a protruding connective element disposed on each connective part;   two moveable seats, each corresponding to one of the connective parts of the visor, a slot being disposed on the front side of each moveable seat to engage the corresponding connective part of the visor, a hole being provided adjacent to said slot to mate with the protruding connective element of the corresponding connective part, a position-limiting slot whose inner part has a saw-toothed shape disposed on the outer side of each of the two moveable seats, a connective hole having at least one indentation disposed at a position posterior to the position-limiting slot, and a hole disposed on the rear part of each of the two moveable seats;   a connective portion having a shaft disposed on the inner side thereof for engagement with the corresponding hole of the moveable seat, at least one protrusion disposed on said shaft, and a connective hole disposed at the posterior end of the connective portion;   a seating unit having at least one fastening protrusion disposed on the inner side thereof and a slot disposed on a central part of the seating unit, wherein the at least one fastening protrusion is for affixing the said seating unit to the helmet; and   a push seat having a protrusion disposed on a central part of the inner side thereof to engage with the slot of the seating unit, a threaded hole provided on an end of the protrusion, at least one engagement element disposed near the end of the protrusion to press against the slot of the seating element to connect the push seat with the seating unit, the end part of the protrusion being inserted into the connective hole of the connective portion, and a fastener for affixing the push seat to the connective portion by means of the threaded hole.   
   
   
       2 . The safety helmet structure of  claim 1 , wherein the at least one fastening protrusion is fitted to a safety helmet so as to allow the upward and downward motions of the visor. 
   
   
       3 . The safety helmet structure of  claim 1 , wherein a position-limiting protrusion of a helmet is affixed inside the position-limiting slot. 
   
   
       4 . The safety helmet structure of  claim 1  wherein a plurality of indentations are provided on the connective hole and a plurality of protrusions are provided on the shaft of the connective portion so that the plurality of indentations of the connective hole are respectively engaged with the plurality of the protrusions of the shaft. 
   
   
       5 . The safety helmet structure of  claim 1  wherein the fastener is a screw.