Wrench with rotatable driving head

A wrench comprising:

• a body having a Y-shaped arm connected to a first end thereof and a handle extending from a second end of the body, a recessed area defined in an inner end of the Y-shaped arm and a recess defined in an inner end of the recessed area, a slit defined in the body and communicating with and a slot defined in the handle and co-axially communicating with the slit, a width of the slit being larger than that of the slot, a locking hole defined transversely through the body and communicating with the recess;
• a push member located in the recess and having a guide hole defined in a mediate portion thereof, the push member having an axial hole defined in a first end thereof and a radial hole defined in an outer surface of the push member and located close to the first end, the guide hole located corresponding to the locking hole and the radial hole located corresponding to the slot, the axial hole communicating with the radial hole and the guide hole, a second end of the push member inserted into the axial hole, the push member having two first push pieces and each first push piece having an extension inserted into the slit and a distal portion extending out from the slit;
• two second push pieces located corresponding to the two first push pieces, each second push piece having a connection ring inserted into the radial hole;
• a push unit having a push rod located in the axial hole and the an end of the push rod extending out from the axial hole and through the two respective connection rings to position the second push pieces in the radial hole, when the two second push pieces are moved in the radial hole, the push rod moves in the axial hole;
• a spring member located in the recess and providing a force to move the push member toward the first end of the body, when the second push pieces are moved toward the second end of the body, the push member compresses the spring member and the push member is moved to open the recessed area;
• a positioning pin extending through the locking hole and the guide hole to restrict the push rod to be moved within the recess;
• a sleeve mounted to the handle to seal the slot, and
• a driving head pivotably connected to the Y-shaped arm by two pivots and multiple positioning holes defined in an outer surface of the driving head, at least one engaging protrusion extending from at least one end of driving head, each positioning hole having an axis that extends toward an axes of the pivots, the push rod being engaged with one of the positioning holes, the engaging protrusion having a through hole defined axially therethrough and a reception hole defined radially in the driving engaging protrusion and communicating with the through hole, a bead engaged with the reception hole, a control rod located in the through hole and having a stepped recess defined radially in a first end thereof, the stepped recess located corresponding to the reception hole of the engaging protrusion, a notch defined in a second end of the control rod and the push rod engaged with the notch, a second spring mounted to the control rod to provide a force to move the control rod in the through hole, the bead engaged with the stepped recess and movable within the reception hole along with a movement of the control rod.