Patent ID: 7565704

Claim:
A safe protective sports helmet comprising a hat body which is provided with therein a circle of head encircling means, and is provided thereon with a rotatable adjusting button fixed on said hat body, said head encircling means and said rotatable adjusting button are movably connected; by rotating said rotatable adjusting button, said head encircling means is adjusted to fit head size of a user; wherein said hat body has a hole; said head encircling means is a belt member having respectively on its two ends two openings, said two openings have on one side of each a line of engaging teeth; said rotatable adjusting button has a central axle for extending into a disk, said disk has a gear protruding centrally out of it; when in assembling, said gear exactly engages with said engaging teeth of said two openings mutually aligned for connecting said two ends of said belt member; said central axle of said rotatable adjusting button then is extended through said two openings to make movable connection of said rotatable adjusting button with said belt member, hence when said rotatable adjusting button is rotated left or right, said gear of disk makes contracting and releasing of said belt member, said two openings on said two ends of said belt member are not separated for being restrained said central axle; and wherein said disk is provided at two sides of said gear each with a hook; root ends of said hooks are connected with said disk, while front ends of said hooks each form with said disk a gap; said hooks each has a protrusion on its outer side; said rotatable adjusting button is provided inside thereof with protruding posts for engaging said hooks of said disk, so that when said rotatable adjusting button is rotated, said disk is rotated by virtue that said hooks are moved by said protruding posts, said hole of said hat body is provided therein with a plurality of clockwise or counterclockwise spines; thereby, when said rotatable adjusting button is not rotated, said protrusions of said hooks exactly abut against said spines, hence said belt member is maintained in a fixed state; when said rotatable adjusting button is rotated clockwise or counterclockwise, said root ends of said hooks in connecting with said disk make said gaps reduced by moving of said protruding posts, and make said protrusions of said hooks forced to snap forwards, thus said disk is rotated; when said rotatable adjusting button is rotated to an opposite one to said direction (one of said directions being rotated clockwise and counterclockwise), said front ends of said hooks are moved by said protruding posts to reduce said gaps, thus said protrusions of said hooks are released from restraining of said clockwise or counterclockwise spines to allow said disk to rotate.