Bi-directional ratchet wrench

[0024]Please refer to FIGS. 4, 5 and 6 for an embodiment of the invention. The bi-directional ratchet wrench of the invention aims to tighten or loosen a bolt or nut. It includes a handle 10, a ratchet wheel 20, a switch element 30, a butting unit 40 and a sealing lid 50.

[0025]The handle 10 aims to be grasped by a user's hand for turning and has a front side expanded to become a round head 11 with a housing trough 12 formed inside. The housing trough 12 is circular at the front side and has a swivel space 15 at the rear side. The swivel space 15 has a retaining trough 16 respectively concaved on the left side and the right side directing rearwards. The housing trough 12 is surrounded annularly by a groove 13. The head 11 has an axial cavity 14 at the rear side with a front opening communicating to the swivel space 15.

[0026]The ratchet wheel 20 is hinged on the housing trough 12 and can rotate therein. It has a plurality of ratchet teeth 21 formed on the perimeter and a square knob stru