Switch-positioning device of a ratchet wrench

A ratchet wrench comprising:

• a head comprising a chamber, a pothole, a channel via which the chamber is in communication with the pothole, and a positioning dent made in a floor of the pothole, wherein the channel comprises two tapered sections and a broad section between the tapered sections;
• a toothed wheel located in the chamber;
• a pawl movable between the tapered sections of the channel via the broad section;
• an arched plate extending between a wall of the pothole and a switch and comprising two bores in communication with the pothole and a boss inserted in the positioning dent to prevent the arched plate from rotation relative to the head;
• and
• the switch being pivotable in the pothole and comprising:
• a tunnel with a first end in communication with the broad section of the channel and a second end in communication with the pothole;
• a detent comprising a first end connected to the pawl and a second end movable in the tunnel;
• a spring comprising a first end in contact with the second end of the detent and a second end;
• and
• a ball comprising a first portion in contact with the second end of the spring and a second portion insertable in a selected one of the bores when the detent moves the pawl to a corresponding one of the tapered sections of the channel.