Safety helmet

Abstract

A safety helmet comprising an outer shell, a snap plug attached to or monolithic with a first side of the outer shell. The snap plug comprises a first aperture and a cam profile. Further, a screw element comprising a first portion that further comprises a plurality of threads, and a second portion of screw element comprises a protrusion. Further, a crown comprising a face shield. The crown comprises a second aperture. Further, a knob comprising a cavity having inner threads. Further, the first portion of the screw element is positioned within the first aperture of the snap plug, the second aperture of the crown, and the cavity of the knob. Further, protrusion engages with the cam profile such that upon rotation of the face shield, the protrusion moves from a first position to a second position of the cam profile.

What is claimed is: 
     
         1 . A safety helmet comprising:
 an outer shell;   a snap plug attached to or monolithic with a first side of the outer shell, wherein the snap plug comprises a first aperture and a cam profile;   a screw element comprising a first portion and a second portion, wherein the first portion comprises a plurality of threads and the second portion comprises a protrusion;   a crown comprising a face shield and coupled to the snap plug via the screw element, wherein the crown comprises a second aperture; and   a knob comprising a cavity, the knob comprising inner threads within the cavity,   wherein the first portion of the screw element is positioned within the first aperture of the snap plug, the second aperture of the crown, and the cavity of the knob, and   wherein the protrusion is configured to engage with the cam profile of the snap plug such that upon rotation of the face shield, the protrusion moves from a first position to a second position of the cam profile to change a position of the face shield.   
     
     
         2 . The safety helmet of  claim 1 , wherein the cam profile comprises one or more grooves configured to provide resistive movement to the protrusion of the screw element. 
     
     
         3 . The safety helmet of  claim 1 , wherein the second portion of the screw element further comprises a block element, wherein the block element is positioned within the second aperture of the crown. 
     
     
         4 . The safety helmet of  claim 3 , wherein the block element has a shape that corresponds to a shape of the second aperture of the crown. 
     
     
         5 . The safety helmet of  claim 1 , wherein when the protrusion is positioned in the first position of the cam profile, the face shield is in a stowed position, and wherein when the protrusion is positioned in the second position of the cam profile, the face shield is in a deployed position. 
     
     
         6 . The safety helmet of  claim 1 , wherein the crown further comprises a first end and a second end, wherein the first end is attached to the first side of the outer shell and the second end is attached to a second side of the outer shell. 
     
     
         7 . The safety helmet of  claim 6 , wherein at least one of the first end and the second end of the crown are detachably positioned between the snap plug and the knob. 
     
     
         8 . The safety helmet of  claim 1 , wherein the first portion of the screw element defines a diameter (D 1 ) of 6.35 mm and the inner threads of the knob defines a diameter (D 2 ) of 8 mm, wherein the diameter D 1  is smaller than the diameter D 2 . 
     
     
         9 . The safety helmet of  claim 1 , wherein the first aperture and the second aperture defines a diameter (D 3 ) of 10.5 mm and (D 4 ) of 10.5 mm respectively. 
     
     
         10 . The safety helmet of  claim 9 , wherein the diameter D 1  is smaller than the diameter D 3  of the first aperture and diameter D 4  of the second aperture. 
     
     
         11 . A method comprising:
 receiving, via a first aperture of a snap plug and a second aperture of a crown, a plurality of threads of a screw element within inner threads of a knob;   engaging, a protrusion of the screw element with a cam profile of the snap plug; and   moving, via a face shield installed with the crown, the protrusion from a first position to a second position of the cam profile to change a position of the face shield.   
     
     
         12 . The method of  claim 11 , further comprising attaching the snap plug at a first side of an outer shell. 
     
     
         13 . The method of  claim 11 , further comprising fabricating the plurality of threads at a first portion of the screw element and protrusion at a second portion of the screw element. 
     
     
         14 . The method of  claim 13 , wherein the second portion of the screw element further comprises a block element, wherein method further comprises positioning the block element within the second aperture of the crown. 
     
     
         15 . The method of  claim 14 , wherein the block element has a shape that corresponds to a shape of the second aperture of the crown. 
     
     
         16 . The method of  claim 11 , further comprising fabricating one or more grooves on the cam profile to provide resistive movement to the protrusion of the screw element. 
     
     
         17 . The method of  claim 11 , wherein when the protrusion is positioned in the first position of the cam profile, the face shield is in a stowed position, and wherein when the protrusion is positioned in the second position of the cam profile, the face shield is in a deployed position. 
     
     
         18 . The method of  claim 11 , wherein the crown further comprises a first end and a second end,
 wherein the first end is attached to the first side of the outer shell and the second end is attached to a second side of the outer shell.   
     
     
         19 . The method of  claim 11 , wherein at least one of the first end and the second end of the crown are detachably positioned between the snap plug and the knob. 
     
     
         20 . The method of  claim 11 , wherein the first portion of the screw element defines a diameter (D 1 ) of 6.35 mm and the inner threads of the knob defines a diameter (D 2 ) of 8 mm, wherein the diameter D 1  is smaller than the diameter D 2 .