Patent ID: 8857297

Claim:
A C-shaped elastic steel block structure, wherein the C-shaped elastic steel block structure is assembled in a ratchet wrench and includes: a C-shaped elastic steel block, wherein the C-shaped elastic steel block is formed by a thermal treatment as an one-piece, and has an opening for providing space for elastic deformation of the C-shaped elastic steel block; a ratchet portion encircling an outer side of the C-shaped elastic steel block and being engaged with the ratchet wrench, so as to make the C-shaped elastic steel block be only rotated unidirectionally in relation to the ratchet wrench; and a female joint portion arranged at an inner side of the C-shaped elastic steel block for receiving and being joined with a work piece, wherein the female joint portion has a plurality of curves, and each of the curves has a concave arc for decreasing stress born by each of the curves; wherein the C-shaped elastic steel block includes: a plurality of deformed regions for elastic deformation of the C-shaped elastic steel block; and a plurality of supporting regions used to keep structural strength of the C-shaped elastic steel block, wherein a width of the supporting regions is greater than a width of the deformed regions, each of the supporting regions extends between a pair of adjacent deformed regions, the deformed regions and the supporting regions cooperate to define the female joint portion, and the deformed regions respectively form concave arcs in the female joint portion; wherein the opening of the C-shaped elastic steel block is defined by a pair of spaced-apart substantially parallel walls, each of the walls extending straight a predetermined distance then curving outwardly in a direction away from the other one of the walls.