Patent ID: 7028590

Claim:
A retractable open-end wrench, comprising: a. a web formed with a lower channel having a major arc cross-section containing an arc exceeding a semi-circle; b. a stationary jaw projecting from a side of said web, c. a movable jaw in operative engagement with said lower channel and forming an open end of a predetermined gap with said stationary jaw, said moveable jaw having, (i) an upper channel proximate said web, said upper channel having a minor arc cross-section containing an arc beneath a semi-circle, said minor arc having a radius slightly greater than a radius of said major arc, said upper channel and said lower channel jointly constructing a receiving hole, (ii) a post projecting from said movable jaw at a location proximate said upper channel, said post having a cross-section corresponding to said cross-section of said lower channel to allow linear movement along said lower channel, and d. a spring received in said receiving hole, said spring subjecting said moveable jaw post to normally urge against said web and allowing linear movement of said movable jaw with respect to said web to thereby increase said predetermined gap.