Latch device for vehicle seat

A latch device for a vehicle seat having a latch assembly for fixing, to a car body, a vehicle seat which is movably provided on the car body, said latch assembly comprising:

• a base plate having a striker groove for receiving a striker;
• a latch provided in the base plate and having a striker engaging groove to be engaged with the striker;
• a ratchet for regulating rotation of the latch in unlatch direction;
• wherein a looseness eliminating lever is attached to the latch by means of a pin moving around a latch shaft for mounting the latch on the base plate;
• wherein one end of the looseness eliminating lever is provided with a latch holding face and an unlatch face to contact with a post provided at a specified position;
• wherein the other end of the looseness eliminating lever is provided with a spring for biasing the latch holding face or the unlatch face to be always in contact with the post;
• wherein an apex as a dead center is formed between the latch holding face and the unlatch face;
• and
• wherein the latch holding face is formed in an arc-shaped inclined surface so as to be remoter from the pin from a start end to a terminal end.