Hook seat tightening structure for ship covers

A hook seat tightening structure for ship covers primarily comprising a seat and a housing within which located two rollers, one turntable, one wheel, one lock bolt, and one lock member, wherein an access is located at a rear end of the seat, two rollers are latched at two sides of the access, an indentation is located at a central position in an interior of the seat With a hole in a center of the indentation, a central column is latched into the hole for positioning, and a projection piece is located a front end of the seat;

• an access located at a rear end of the housing, an indentation located at a central position in an interior of the housing, a hole located at a center of the indentation, a through-hole and a lock hole located on the housing, a tube section and a positioning column of the lock hole being protruded from a bottom surface of the housing, a notch located on the tube section of lock hole, a lock member being connected with the tube section of lock hole, the lock hole being provided with a hexagonal inner hole, a tenon, which can be rotated and moved in the notch of tube section, located at a side of the lock member, and a projection piece located at a front end of the housing;
• a through-hole located at a center of the turntable, a positioning hole located at a side of the through-hole, and ridges, which are radially extended, located at a periphery of the through-hole;
• a hollow part located at a top surface of the turntable, one-way ratchets located at a periphery of the hollow part, a central column having a through-hole and ridges which are radially extended located at a bottom surface, and a column head located at a side of the central column;
• a depressing piece and tenon located at two sides of the lock bolt respectively, a bore located at a top end of the lock bolt, a hole located on the tenon with an end of a spring inserted in the hole, and the other end of the spring hooked on the positioning column of the housing, the depressing piece pressed against the one-way ratchets of turntable, a latching place located on an exterior wall at a top end of the lock bolt, the lock bolt being rotated by a connection and control of a knob, and the lock member being provided with a key;
• the housing being covered on the seat, and a rivet being used to rivet the projection pieces of the housing and seat, so as to rivet the two casings to form an integral body, a rope entering from a side of the access at a bottom of the tightening device and reeved on the turntable and wheel, followed by passing out from another side of the access.