| 摘要 |
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.
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