Patent ID: 7793599

Claim:
An apparatus for locking the relative position of first and second generally planar structures that are generally parallel to one another, the first and second generally planar structures having a collapsed condition in which they are spaced from one another by a first distance and a deployed condition in which they are spaced from one another by a second distance greater than the first distance, the apparatus comprising: an elongated frame member having first and second ends, said first end of said elongated frame member configured to be pivotally coupled to the first generally planar structure; and an elongated arm having a plurality of portions and first and second ends, said first end of said elongated arm being pivotally coupled to said elongated frame member and said second end of said elongated arm configured to be pivotally coupled to the second generally planar structure, wherein: said elongated frame member and said elongated arm are generally coaxial and transverse to the first and second generally planar structures in the deployed condition of the first and second generally planar structures, and the length of said elongated arm is adjustable by relative movement of said plurality of portions along the length of said elongated arm to thereby selectively lock and unlock said elongated frame member relative to the second generally planar structure.