Patent ID: 8291792
Filing Date: 2012-10-23
Classification: B25B

Abstract:
1. A ratchet wrench comprising: a main body having a handle at one end and a function end at the other, the function end having a round first housing opened in its middle, on the wall of the first housing being sunk a curved second housing, the center of the second housing being located inside the first housing, and both the top and the bottom portions of the second housing being confined; a ratchet wheel being rotatably mounted in the first housing, the outer periphery of the ratchet wheel having a plurality of ratchet teeth annularly arranged at its middle portion, and the center of the ratchet wheel having a couple portion; a pawl lodged in the second housing having a plurality of first retaining cogs, a plurality of curved second retaining cogs and a first concave surface successively arranged on its front side and distributed along a first arc which has the same diameter as the first housing, the first retaining cogs and the second retaining cogs being defined to engage with the ratchet teeth, the tips of the first retaining cogs distributing on a third arc and the tips of the second retaining cogs distributing on a fourth arc, at least two teeth of the first retaining cogs passing a bisector of the first arc and being followed by the second retaining cogs as the pawl and the ratchet wheel being effectively engaged together, the central angle of the second retaining cogs extended along the first arc being less than or equal to 20 degrees, on the rear side of the pawl being a first convex surface which has a first end and a second end defined in opposite directions, the first end extending a second convex surface towards the front side of the pawl and the second end extending a recess, the second convex surface spanning a central angle N an elastic element having a first end and a second end, the outer diameter of the first end being greater than or equal to the vertical depth of the second housing in order for the first end to be held against the second housing and for the second end to be held within the recess, and the elastic element pushing the pawl so that the second convex surface being forced to abut against the wall of the second housing and the first retaining cogs of the pawl being engaged with the ratchet teeth.