Theftproof quick-release type clamping assembly for mounting bicycle part

Claim 1

A theft proof quick-release type clamping assembly for mounting a bicycle part comprising: a tie rod having one end screwed to an end nut, said rod being provided at the other end with an enlarged head which is formed with a cam hole extending therethrough transversely of said rod, a hollow presser member fitted around said enlarged head and movable relative thereto axially of said rod toward and away from said and nut, a lever mounted to said presser member and pivotable about a pivotal axis between a clamping position and a releasing position, said lever having a cam portion received within said cam hole and eccentric relative to said pivotal axis for moving said presser member by said cam portion relative to said enlarged head axially of said rod in response to pivotal movement of said lever, lock means provided separately from said lever and operable for limiting axial movement of said presser member away from said end nut when said lever is pivoted to said clamping position, and removal facilitating means for allowing removal of said lever from said presser member without using any tool when said lock means is operated to limit axial movement of said presser member away from said nut, wherein said lever has a shaft portion formed with an annular flange rotatably fitted in a shaft receiving hole of said presser member, said removal facilitating means comprising an annular engaging member rotatably fitted around said presser member, said engaging member being formed with a lever passage opening which engages said flange of said shaft portion in one rotational position of said engaging member but allowing passage of said flange in another rotational position of said engaging member.