Patent ID: 7007400

Claim:
A strengthened blade tape measure, comprising: a tape casing having a receiving cavity and a guider opening communicating with said receiving cavity; a retraction unit supported in said receiving cavity; and a ruler blade, having an inner end attached to said retraction unit and an outer end stopped at said guider opening, adapted to slidably fold between a storage position and a measuring position, wherein at said storage position, said ruler blade is retracted to receive in said receiving cavity in a coil flattened configuration manner via said retraction unit, and at said measuring position, said outer end of said ruler blade is slidably pulled to extend said ruler blade in a concave-convex configuration out of said receiving cavity through said guider opening, said ruler blade having a width in said flattened configuration thereof having a dimension within a range of 40–42 mm, a height in said concave-convex configuration thereof having a dimension within a range of 9–12 mm, and a thickness thereof having a dimension at least 0.115 mm or more, such that said ruler blade is capable of standing out from said tape casing with a measuring length at least 10 feet in a self-sustaining manner so as to prevent said ruler blade from buckling by its own weight.