A hatch cover lock comprises a front member including a pair of flanges, a rear member positioned between the pair of flanges; a gap defined between front member and the rear member; a clamp defining a J-shaped cross-section in a plane normal to a length thereof, the clamp having one leg thereof disposed in the gap and having another leg thereof disposed parallel to an outer surface of the rear member and at a distance therefrom, a handle, a first pivotal connection between the handle and the front member, a gravity lock, a second pivotal connection between the gravity lock and the handle, and a weld-free connection between the main portion of the rear member and the main portion of the front member.

The lock catch structure comprises a first lock catch main body and a second lock catch main body. The first lock catch main body comprises a first base and a first main body rotationally connected to the first base; The second lock catch structure comprises a second base, a second main body rotationally connected to the second base, a handle hinged at the base and a draw-off locking member pivoted with the handle through a pivot shaft; one end of the draw-off locking member is limited in the groove, and the handle rotates around the pivot shaft as the support point, so that the draw-off locking member drives the first lock catch main body to move towards the second lock catch main body until the first inclined surface is pressed against the second inclined main surface.

The present application discloses a waterproof bait box, including: a box body provided with an opening at a top; a cover body rotatably connected with one side of the box body and covering the opening; and a locking piece including a connecting piece and a locking plate, wherein one side of the connecting piece is rotatably connected with one side of the locking plate; the other side of the connecting piece is rotatably connected with the box body; the other side of the locking plate is capable of being connected with the cover body in a buckling manner; and when the other side of the locking plate is connected with the cover body in the buckling manner, one side of the locking plate and one side of the connecting piece can rotate towards the box body and be buckled to lock the box body and the cover body.