Ratchet-type wrench

A ratchet-type wrench for driving a component having a head defining a hexagonal driving profile, said wrench comprising:

• a handle;
• and
• a one-piece pair of jaws connected to an end of said handle, said pair of jaws including, with respect to a driving direction of said pair of jaws, a front jaw, a rear jaw, and a connecting bow connecting said front and rear jaws,
• said front jaw comprising a first protrusion adapted to cooperate with a forward portion of a front face of the hexagonal driving profile in a first driving position of the wrench,
• said rear jaw comprising a first protrusion adapted to cooperate with a forward portion of a rear face of the hexagonal driving profile in the first driving position of the wrench, wherein the front and rear faces are in opposite positions on the hexagonal driving profile of the head,
• said connecting bow defining a first protrusion adapted to bear on, in the absence of torque and during application of a driving torque, a bearing point of an intermediate face of the hexagonal driving profile, the intermediate face lying immediately forward of the rear face of the hexagonal driving profile with respect to the drive direction of said pair of jaws, the bearing point of the intermediate face being located in a forward half of the intermediate face,
• said connecting bow being spaced away from the head at every point other than at the bearing point in the absence of torque and during application of a driving torque, wherein:
• said front jaw further comprises a second protrusion adapted to cooperate with a front face of the hexagonal profile in a second driving position of the wrench;
• said rear jaw further comprises a second protrusion adapted to cooperate with a rear face of the hexagonal profile in the second driving position of the wrench;
• said connecting bow further comprises a second protrusion adapted to bear on a bearing point of an intermediate face of the hexagonal profile in the second driving position in the absence of torque and during application of a driving torque, the bearing point of the second protrusion of the connecting bow being located in a forward half of the intermediate face, wherein said connecting bow is completely spaced away from the hexagonal head at every point other than at the bearing point, in the second driving position, in the absence of torque and during application of a driving torque;
• and
• the points of contact in the first driving position, which is defined by contact of said first protrusions with the hexagonal driving profile of the head, are offset by an angle A that is substantially 24 to 28° relative to the points of contact in the second driving position, which is defined by contact of said second protrusions with the hexagonal driving profile of the head, so that a change from the first driving position to the second driving position is achieved by rotating the wrench backward through the angle A, and a change from the second driving position to the first driving position is achieved by rotating the wrench backward through an angle that is equal to 60° minus the angle A.