A bi-directional ratchet wrench is constructed to include a wrench body having a box at one end, an annular ratchet wheel mounted in the box of the wrench body, a toothed stop member mounted in the box and meshed with the ratchet wheel, the ratchet wheel having an inside locating groove extended around...http://www.google.fr/patents/US6688195?utm_source=gb-gplus-shareBrevet US6688195 - Bi-directional ratchet wrench
