Patent ID: 7533691

Claim:
A damper assembly, comprising: a support means defining an opening; a damper component comprising a rotation element pivotally connected to said support means; an adjustable locking means comprising a first portion mounted to the support means and a second portion mounted to the rotation element pivotally connected to said support means, said adjustable locking means being configured for releasable retention of said rotation element pivotally connected to said support means in one of a plurality of predetermined lock positions; wherein said first and second portions of said adjustable locking means are configured so that said rotation element pivotally connected to said support means can be rotated from one said predetermined lock position to another said predetermined lock position for adjusting air flow through said opening wherein said rotation element pivotally connected to said support means comprises a shaft member pivotally mounted to said support means for rotation of said rotation element, wherein said second portion is mounted to said shaft member, wherein said first portion comprises a female component comprising a plurality of notches, and wherein said second portion comprises a male member and a lock biasing element, said male member being releasably engageable in each of said notches for releasable locking engagement therewith and said lock biasing element being configured for biasing said male member into releasable locking engagement with a said notch, said first and second portions of said adjustable locking means being configured and disposed such that rotation of said shaft member is able to induce displacement of said male member from one said notch to another said notch.