Patent ID: 9744652
Date: 2017-08-29
CPC Classifications: B25B

Claim:
1. A ratchet wrench comprising: a head having a through hole defined through a top and a bottom thereof, a first recess defined in an inner periphery of the through hole, a center of the first recess being located within the through hole, the first recess including a closed portion formed at the bottom of the head, a second recess defined in an inner periphery of the first recess and having at least one open end; a ratchet member rotatably located in the through hole and having first teeth defined in an outside thereof, a first groove defined in a first end of the ratchet member and an enlarged disk formed on a second end of the ratchet member, the disk exposed from the head and contacting the bottom of the head, a circular hole defined through an inner periphery of the first groove, the first groove and the hole being exposed from the top of the head, the ratchet member having a non-circular mounting portion with which the first groove and the circular hole communicate; a pawl movably located in the first recess, the pawl having second teeth defined in a front side thereof and a recessed portion defined in a rear side thereof, the second teeth engaged with the first teeth, the recessed portion having a first curved face and two second curved face which are located symmetrically on two ends of the first curved face; a control unit located in the second recess so as to control a movement of the pawl in the first recess and a rotational direction of the ratchet member, the control unit having a control member, an engaging member and a resilient member, the control member having a cylindrical rod which is rotatably located in the second recess, a slot defined axially in a distal end thereof, the slot radially defined through the cylindrical rod, a notch defined in an outer periphery of the cylindrical rod and communicating with the slot, a diameter of the notch being larger than a width of the slot, two curved areas defined in the outer periphery of the cylindrical rod and separated by the slot, the two curved areas located symmetrically relative to the slot, the control member having a lever which extends beyond the second recess, the engaging member engaged with the slot and having a length the same as that of the slot, the engaging member having a receiving recess defined centrally in a rear side thereof, a gap between two sidewalls of the receiving recess being the same of the diameter of the notch, the engaging member having two contact areas and a recessed section on a front side thereof, the recessed section located between the two contact areas, the resilient member located in the receiving recess and the notch, a diameter of the resilient member being the same as that of the diameter of the notch, a first end of the engaging member contacting the closed portion which restricts the engaging member, the engaging member restricting the resilient member which restricts the cylindrical rod so that the control member is not disengaged from the second recess, when the control member rotates, the engaging member moves the pawl in the first recess, when the two contact areas are biased by the resilient member and contact the one of the second curved faces, the second teeth of the pawl are engaged with the first teeth of the ratchet member, the rear side of the pawl is engaged with one of the curved areas; a cover covering the first and second recesses, the cover having a hole through which the first end of the ratchet member extends; a clip engaged with the head and exposed beyond the head and contacting the cover, the clip having a hook extending inward from one of two ends thereof, the hook extending through the circular hole of the ratchet member and reaching into the mounting portion; an end piece sealing the mounting portion, and a locking ring connected to one end of the mounting portion and having a hole with which the end piece is engaged to seal the mounting portion.