Abstract: A locking device includes a locking pin mounting box, a locking pin, a locking spring, a handle and an unlocking tension spring. Respective ends of the locking pin pass through corresponding locking pin guide holes in lateral sides of the locking pin mounting box. A spring bearing boss is provided in a middle position of each locking pin. The locking spring surrounds the corresponding locking pin with one locking spring end in contact with one lateral side and another end in contact with the spring bearing boss. One end of the handle is hinged to a top side of the locking pin mounting box. The unlocking tension spring has one end connected to the handle and another end connected to an end of the locking pin that has passed through the first lateral side. In the locking device, the locking pin is inserted into a locking hole to achieve locking.

Abstract: A motor vehicle seat rotation mechanism includes a connecting plate connected to a seat, a moving plate, located below the connecting plate and connected to the connecting plate, and a fixed plate, located below the moving plate and connected to an upper slide rail in a seat slide rail assembly. An upper ball assembly is located between a press plate and the moving plate. A lower ball assembly is located between the moving plate and the fixed plate. A lower anti-detachment hook ring is located between the connecting plate and the fixed plate and fixed to the fixed plate. An annular lower anti-detachment hook is provided at an inner edge of the lower anti-detachment hook ring. An annular upper anti-detachment hook is provided at an outer edge of the moving plate. The lower anti-detachment hook and the upper anti-detachment hook are engaged with each other.

Abstract: A motor vehicle seat rotation mechanism includes a connecting plate connected to a seat, a moving plate, located below the connecting plate and connected to the connecting plate, and a fixed plate, located below the moving plate and connected to an upper slide rail in a seat slide rail assembly. An upper ball assembly is located between a press plate and the moving plate. A lower ball assembly is located between the moving plate and the fixed plate. A lower anti-detachment hook ring is located between the connecting plate and the fixed plate and fixed to the fixed plate. An annular lower anti-detachment hook is provided at an inner edge of the lower anti-detachment hook ring. An annular upper anti-detachment hook is provided at an outer edge of the moving plate. The lower anti-detachment hook and the upper anti-detachment hook are engaged with each other.

Abstract: A locking device includes a locking pin mounting box, a locking pin, a locking spring, a handle and an unlocking tension spring. Respective ends of the locking pin pass through corresponding locking pin guide holes in lateral sides of the locking pin mounting box. A spring bearing boss is provided in a middle position of each locking pin. The locking spring surrounds the corresponding locking pin with one locking spring end in contact with one lateral side and another end in contact with the spring bearing boss. One end of the handle is hinged to a top side of the locking pin mounting box. The unlocking tension spring has one end connected to the handle and another end connected to an end of the locking pin that has passed through the first lateral side. In the locking device, the locking pin is inserted into a locking hole to achieve locking.