Wrench

A wrench for turning a polygonal fastener, the fastener having a plurality of opposing parallel sides and where adjacent sides meet at respective corners, said wrench comprising:

• an opening with an open end;
• a throat opposite said open end for forming a closed end to said opening;
• and
• a pair of opposing jaws with opposing fastener-engaging surfaces extending from said throat toward said open end, said jaws defining sides of said opening, said fastener-engaging surfaces being provided for gripping opposing parallel sides of the fastener within said opening, the gripped sides of the fastener having rear portions proximal said throat and front side corners proximal said open end, said fastener-engaging surfaces comprising:
• a pair of opposing planar sections positioned to extend past the front side corners of the polygonal fastener fully seated within said opening, said opposing planar sections being substantially parallel to each other for engaging the forward corners of a polygonal fastener fully seated in said opening, said planar sections each having a rear end portion proximal said throat and being devoid of relief regions at the corners of a gripped polygonal fastener;
• and
• a pair of opposing diverging sections each having a forward end and a rearward end, said diverging sections including fastener-engaging irregularities and being disposed between said respective opposing parallel planar sections and said throat on each of said opposing jaws, said diverging sections diverging continuously from the respective forward ends thereof towards said throat for contacting at least one of the gripped sides of a polygonal fastener when said wrench turns about an axis of a fastener received in said opening.

A symmetrical open-end wrench for receiving fasteners having polygonal heads, said wrench having a front portion, a rear portion, a cavity and an axis of symmetry, said wrench comprising:

• a throat;
• a pair of spaced apart jaws on opposite sides of said axis of symmetry and connected to said throat, said jaws including:
• front ends spaced apart with respect to the axis of symmetry to define an opening to the cavity of said wrench, said spaced apart front ends defining a forward open end;
• planar sections extending rearwardly from the respective front ends, said planar sections being spaced apart with respect to the axis of symmetry and being parallel to each other;
• rounded rear corners at the rearward portion of each of said diverging sections;
• outwardly diverging sections being disposed between said respective planar sections and said rounded rear corners, said diverging sections diverging continuously from the rearward ends of said respective planar sections and extending rearwardly and merging with the forward ends of said respective rounded rear corners in a smooth transition without any abrupt changes between said respective diverging sections and said respective rounded corners, said diverging sections having irregularities for engaging respective sides of a fastener received in the cavity of said wrench;
• and
• said throat being rounded and interconnecting said rounded rear corners, and planar sections each having a length extending beyond the front side corners of a fastener received in the cavity of said wrench with a corner of the fastener-engaging said throat.