Patent ID: 7575403

Claim:
A fastener for securing a cargo container, comprising: a first fastener component including first and second fixed bodies, and a pair of rails bridging said first and second fixed bodies, said first fixed body having a screw hole; a mounting seat mounted slidably on said rails for sliding along said rails and having a central through-hole aligned with said screw hole in an axial direction, and a retaining recess in spatial communication with and extending in a tangential direction from said central through-hole; a second fastener component including a threaded shaft extending threadedly through said screw hole in said first fixed body toward said second fixed body, and a toothed part extending axially from said threaded shaft into said central through-hole in said mounting seat and formed with a plurality of angularly displaced teeth, each of which has a contact surface extending in said axial direction; and an engagement unit including an urging member that is mounted in said retaining recess in said mounting seat, and an engaging element that is mounted in said retaining recess in said mounting seat, that is urged by said urging member, and that has a free end portion extendable into said central through-hole in said mounting seat and in contact with at least one of said teeth upon relative rotation between said mounting seat and said second fastener component, said engaging element being movable in said tangential direction such that said free end portion can be retracted into said retaining recess in said mounting seat; wherein said free end portion of said engaging element has a flat contact surface that extends in said tangential direction and said axial direction, and that extends into said central through-hole in said mounting seat to abut against said contact surface of an adjacent one of said teeth of said toothed part in such a manner to arrest rotation of said mounting seat relative to said second fastener component in a first direction; and wherein said free end portion of said engaging element further has a curved contact surface that extends curvedly from said flat contact surface such that said curved contact surface is in sliding contact with said contact surfaces of said teeth of said toothed part one by one and that said free end portion of said engaging element is retracted into said retaining recess by pushing action of said teeth of said toothed part against urging action of said urging member during rotation of said mounting seat relative to said second fastener component in a second direction opposite to said first direction.