Wrench adjustable in head angle

A wrench adjustable in head angle comprising:

• a pull lever having one end formed with an end face, said end face provided with two opposite lugs, said two lugs formed with a first opening therebetween, said end face of said pull lever axially provided with an accommodating groove, said two lugs respectively and symmetrically provided with a pivot joint portion, said pull lever having another end formed with a holding portion;
• a spring received in said accommodating groove;
• a resisting pin positioned in said accommodating groove, said resisting pin having one end resisting against said spring, said resisting pin having another end formed with an engaging portion, said resisting pin provided with a first push portion;
• a push member consisting of a positioning plate located at said first opening, said positioning plate bored with a positioning hole corresponding with said resist pin for said resisting pin to be inserted therethrough, said positioning plate formed with a second push portion corresponding to said first push portion of said resist pin, said first push portion elastically pushed by said spring to resist against said second push portion, said positioning plate having at least one side edge protruding out of said first opening and extending axially along said pull lever to form a push plate, said push plate closely stuck to said pull lever, a space formed between said positioning plate and said end face of said pull lever to allow said push member to move toward said end face;
• and
• a driving head formed with a pivot turning portion, said pivot turning portion provided with a second pivot joint portion corresponding with said first pivot joint portion for said driving head and said pull lever to be pivotally connected with each other, said pivot turning portion of said driving head provided thereon with a ratchet surface corresponding with said engaging portion of said resisting pin, said ratchet surface able to be engaged with said engaging portion of said resisting pin;
• Thus, said push plate pushed toward said holding portion, said push member actuating said resisting pin to press said spring to let said resisting pin disengaged from said driving head for adjusting an angle of said driving head, said push plate released to have said resisting pin elastically pushed by said spring and engaged with said driving head for fixing said driving head in position.