Rotating-lever-position-holding device

A position holding device for a rotating lever, comprising:

• a base member having a support portion;
• a rotating lever rotatably supported by the base member;
• a first stopper member configured to abut against the rotating lever when the rotating lever rotates in a first direction, to thereby hold the rotating lever at a first position;
• a second stopper member configured to abut against the rotating lever when the rotating lever rotates in a second direction opposite to the first direction, to thereby hold the rotating lever at a second position;
• and
• a torsion spring interposed between the rotating lever and the base member, the torsion spring being configured to urge the rotating lever in the first direction when the rotating lever is located at the first position, and to urge the rotating lever in the second direction when the rotating lever is located at the second position,
• the torsion spring comprising:
• a coiled part mounted so as to be rotatable about the support portion;
• and
• a first arm part and a second arm part each extending from the coiled part so as to sandwich an engagement portion formed on the rotating lever from both sides thereof,
• the first arm part comprising a mountain portion formed into a shape that is convex toward the second arm part,
• the mountain portion comprising:
• a peak portion onto which the engagement portion climbs when the rotating lever is located at a neutral position between the first position and the second position;
• a first inclined portion configured to urge the rotating lever in the first direction when the rotating lever is located at a rotational position between the neutral position and the first position;
• and
• a second inclined portion configured to urge the rotating lever in the second direction when the rotating lever is located at a rotational position between the neutral position and the second position,
• the second arm part comprising a reversely urging portion formed thereon, the reversely urging portion being configured to engage with the engagement portion when the rotating lever is located at the rotational position between the neutral position and the first position, to thereby urge the rotating lever in the second direction with a force smaller than a force for urging the rotating lever in the first direction by the first inclined portion,
• the base member comprising a regulating member configured to abut against the first arm part when the rotating lever rotates toward the first position through the neutral position.