Patent ID: 7540033

Claim:
A device for opening-closing sun visor of a helmet comprising; a helmet body provided in front with an opening portion for the face and having a pair of hinge shafts protruding from the helmet body on left and light sides thereof; a sun visor having a visor portion alignable with the opening portion of said helmet body, extending portions extended to the left and right sides of the visor portion and hinge slots formed at the ends of the extending portions; and an opening-closing mechanism connected to a top center of the visor portion of said sun visor for enabling or facilitating forward and backward movements thereof; wherein the opening-closing mechanism comprises: a slider having a front end connected to the top center of the visor portion of said sun visor and a rear end provided with a knob; a guide rail which is attached to the ceiling or upper side of the helmet body for guiding forward and backward movements of the slider; a guide holder which is attached lengthwise to the top center of the helmet body for guiding the sliding of the slider; a lock for releasably maintaining the slider in a forward or advanced position; and an attaching-detaching means which detachably installs said sun visor on said slider, the lock including a locking slot formed on a surface of the slider and a locking stopper or latch pivotably mounted to the guide holder by a hinge pin and elastically supported by a spring, wherein a bottom end of the locking stopper or latch catches in the locking slot; the slider being provided with a return spring for quickly returning to an original position from the forward or advanced position, one end of the return spring being connected to a protuberance formed on the front end of the slider and another end of the return spring being connected to a pin inserted into one end of the guide holder, said attaching-detaching means including a hook formed in the center of the visor portion of the sun visor and a hook holder formed on the front end of the slider into which the hook is inserted, said attaching-detaching means being assembled pivotably to the sun visor by inserting the pair of hinge shafts of the helmet body into the hinge slots, wherein each of the hinge slots is a U-shaped slot of open form.