Seat sliding apparatus

A seat sliding apparatus, comprising:

• a pair of right and left lower rails (20, 20) each having lock teeth (22, 22) formed thereon;
• a first and a second upper rails (30A, 30B) being arranged as a pair of right and left upper rails, the first and second upper rails (30A, 30B) being slidably mounted to the pair of right and left lower rails (20, 20) respectively, the first upper rail (30A) positioned at a seat belt anchorage plate attachment side, the second upper rail (30B) positioned opposite to the seat belt anchorage plate attachment side;
• first and second lock plates (40A, 40B) wherein portions of bases of the lock plates (40A, 40B) rotatably provided on side surfaces of the first and second upper rails (30A, 30B) by pivot portions (41, 41) respectively, lock holes (42a, 42a) engaged with the lock teeth (22, 22) formed on the pair of right and left lower rails (20, 20) being formed on free ends of the first and second lock plates (40A, 40B), respectively;
• lock springs (50, 50) provided at the first and second upper rails (30A, 30B) respectively, urging forces of the lock spring (50, 50) causing the lock holes (42a, 42a) to be engaged with the lock teeth (22, 22) respectively, the engagement of the lock holes with the lock teeth preventing a longitudinal movement of a seat main body (60) to be provided on the first and second upper rails (30A, 30B);
• and
• an operation lever (70) attached to the first and second lock plates (40A, 40B), the first and second lock plates (40A, 40B) simultaneously rotated and the engagement of the lock holes (42a, 42a) with the lock teeth (22, 22) released by operating the operation lever (70), the release of the engagement permitting the longitudinal movement of the seat main body (60), wherein
• the first end portion (70a) of the operation lever (70) is attached to a portion of the pivot portion (41) of the first lock plate (40A);
• and
• an operation lever attachment member (45) for attaching a second end portion (70b) of the operation lever (70) to a portion of the pivot portion (41) of the second lock plate (40B) is provided to be rotatable and freely up and down.