Patent ID: 8109180

Claim:
A ratchet wrench comprising, in combination: a body including a head and a handle interconnected to the head, with the head including first and second sides spaced along a rotating axis, with the head further including a compartment extending from the first side through the second side, with a pawl groove defined in an inner periphery of the compartment, with the second side of the head including an end wall defining a hole in communication with the compartment, with the end wall including an inner face facing the compartment, a drive member rotatably received in the compartment about the rotating axis, with the drive member including first and second ends spaced along the rotating axis, with the second end of the drive member including an end face, with a gap formed between the end face and the inner face along the rotating axis, with one of the end face and the inner face defining a first abutment face, with the other of the end face and the inner face including an annular groove, with the annular groove having a bottom wall defining a second abutment face, with a spacing defined between the first and second abutment faces along the rotating axis, with the first end of the drive member adapted to drive an object, with the drive member further including an outer periphery extending between the first and second ends, with a plurality of teeth formed in the outer periphery of the drive member; a pawl slideably received in the pawl groove and including a side having a plurality of teeth engaged with the plurality of teeth of the drive member; and a dustproof ring mounted and compressed in the annular groove, with the dust ring pressing against the first and second abutment faces, with the dustproof ring in an uncompressed state having a natural maximum height along the rotating axis larger than the spacing, with the dustproof ring including first, second, and third sealing units, with the third sealing unit radially outwards of the first sealing unit in a radial direction perpendicular to the rotating axis, with the second sealing unit interconnected to and intermediate the first and third sealing units in the radial direction, with the first sealing unit including a first thickness along a first axis parallel to and spaced from the rotating axis, with the second sealing unit including a second thickness along a second axis parallel to and spaced from the rotating axis and the first axis, with the third sealing unit including a third thickness along a third axis parallel to and spaced from the rotating axis and the first and second axes, with the second axis intermediate the first and third axes in the radial direction, with each of the first, second, and third thicknesses smaller than the spacing, with a buffering space formed between the first and third sealing units, with the buffering space receiving deformed portions of the dustproof ring received in the annular groove.