Lock device of vehicle seat

A lock device for locking a seat of a vehicle relative to a striker fixed to a vehicle body, comprising:

• a base plate having a striker receiving recess for receiving therein the striker;
• a latch plate rotatably connected to the base plate through a first shaft and having a striker catching recess for catching the striker, the latch plate being rotatable between a latch position to cause the striker catching recess to catch the striker and an unlatch position to cause the striker catching recess to release the striker;
• a lock plate rotatably connected to the base plate through a second shaft and rotatable between a lock position to cause the latch plate to be locked at the latch position and an unlock position to cause the latch plate to be unlocked;
• a cover member having a U-shaped flange formed thereon, the cover member covering one major surface of the base plate having the U-shaped flange neatly disposed on a peripheral edge of the striker receiving recess;
• pawls provided by the base plate, the pawls being depressed toward the cover member;
• recesses provided by the cover member for receiving the pawls respectively;
• stoppers provided by respective walls of the recesses for preventing the pawls from being disengaged from the recesses;
• openings provided by the base plate;
• ribs provided by the cover member, the ribs being inserted into the openings respectively for achieving a relative positioning between the base plate and the cover member;
• a first spring for biasing the latch plate to turn toward the unlatch position, one end of the first spring being connected to a part of the latch plate;
• a second spring for biasing the lock plate to turn toward the lock position;
• a pressing cam rotatably connected to the base plate through the second shaft, the pressing cam having a projection for catching the other end of the first spring and an engaging arm that is engageable with a part of the lock plate, so that the rotation of the lock plate toward the unlock position is made against the force of the first spring;
• and
• a holding plate that holds one end of the first shaft and one end of the second shaft, the holding plate being detachably connected to the cover member while holding therebetween the base plate, the latch plate, the lock plate and the pressing cam.