US Patent 7124510 Knife with double-ended rotatable blade

A long blade of a knife has first and second working end portions disposed at opposite sides of the blade central portion. The central portion of the blade is pivotally attached to a handle such that, in a first position, the first working end portion is exposed for use and the second working end portion extends along the handle, and in a second position, the second end portion of the blade is exposed for use and the first end portion of the blade extends along the handle. A spring biased locking mechanism is provided to retain the blade in either of the first or second positions.