Ratchet structure

Abstract

A ratchet structure is provided. The ratchet structure comprises a housing having at least one pair of racks slidably overlapped with each other. Further, a cover coupled to the housing, having a cavity. Further, a ratchet gear detachably secured within the cavity, and comprising a plurality of elastic ribs having one or more grooves. Further, a knob having a plurality of driving ribs configured to be received within the one or more grooves of the plurality of elastic ribs. Therefore, the plurality of driving ribs facilitates the movement of the plurality of elastic ribs of the ratchet gear to slide the at least one pair of racks.

What is claimed is: 
     
         1 . A ratchet structure comprising:
 a housing having at least one pair of racks slidably overlapped with each other;   a cover coupled to the housing, having as cavity;   a ratchet gear detachably secured within the cavity, wherein the ratchet gear comprising a plurality of elastic ribs having one or more grooves; and   a knob having a plurality of driving ribs configured to be received within the one or more grooves of the plurality of elastic ribs,   wherein the plurality of driving ribs facilitates the movement of the plurality of elastic ribs of the ratchet gear to slide the at least one pair of racks.   
     
     
         2 . The ratchet structure of  claim 1 , wherein a rod is attached to the housing that radially extends through the cover and the ratchet gear. 
     
     
         3 . The ratchet structure of  claim 1 , wherein the cavity is fabricated with a first set of snaps and the ratchet gear is fabricated with a second set of snaps. 
     
     
         4 . The ratchet structure of  claim 3 , wherein the first set of snaps engages with the plurality of elastic ribs and the second set of snaps engages with the at least one pair of racks, for the adjustment of the ratchet gear. 
     
     
         5 . The ratchet structure of  claim 3 , wherein the first set of snaps engages with the second set of snaps to interlock with each other and restrict movement of the ratchet gear, that in turn locks the movement of the at least one pair of racks. 
     
     
         6 . The ratchet structure of  claim 3 , wherein the at least one pair of racks is fabricated with a notched track that engages with the second set of snaps for the adjustment of the ratchet gear. 
     
     
         7 . The ratchet structure of  claim 3 , wherein the plurality of elastic ribs is fabricated with at least one protruded section that deforms while making contact with the second set of snaps of the ratchet gear. 
     
     
         8 . The ratchet structure of  claim 1 , wherein the knob having one or more recess for proper holding of the knob. 
     
     
         9 . The ratchet structure of  claim 1 , wherein the knob includes a plurality of clips configured to couple the knob to the cover. 
     
     
         10 . The ratchet structure of  claim 1 , wherein the ratchet gear having at least one location column, for providing support to the plurality of elastic ribs. 
     
     
         11 . A helmet ratchet structure comprising:
 a housing attached to a helmet via at least one pair of racks slidably overlapped with each other;   a cover coupled to the housing, having a cavity fabricated with a first set of snaps;   a ratchet gear detachably secured within the cavity, wherein the ratchet gear comprising a second set of snaps and a plurality of elastic ribs with one or more grooves; and   a knob having a plurality of driving ribs configured to be received within the one or more grooves,   wherein the plurality of driving ribs facilitates movement of the plurality of elastic ribs of the ratchet gear to slide the at least one pair of racks and the second set of snaps engages with the first set of snaps, to restrict movement of the ratchet gear, that in turn locks the movement of the at least one pair of racks to fasten the helmet.   
     
     
         12 . The helmet ratchet structure of  claim 11 , wherein a rod is attached to the housing that radially extends through the cover and the ratchet gear. 
     
     
         13 . The helmet ratchet structure of  claim 11 , wherein the first set of snaps engages with the plurality of elastic ribs and the second set of snaps engages with the at least one pair of racks, for the adjustment of the ratchet gear. 
     
     
         14 . The helmet ratchet structure of  claim 11 , wherein the at least one pair of racks is fabricated with a notched track that engages with the second set of snaps for the adjustment of the ratchet gear. 
     
     
         15 . The helmet ratchet structure of  claim 11 , wherein the plurality of elastic ribs is fabricated with at least one protruded section that deforms while making contact with the second set of snaps of the ratchet gear. 
     
     
         16 . The helmet ratchet structure of  claim 11 , wherein the knob having one or more recess for proper holding of the knob. 
     
     
         17 . The helmet ratchet structure of  claim 11 , wherein the knob includes a plurality of clips configured to couple the knob to the cover. 
     
     
         18 . The helmet ratchet structure of  claim 11 , wherein the ratchet gear having at least one location column, for providing support to the plurality of elastic ribs.