Safety lock catch

A safety lock catch, is characterized by containing:

• a lock body, the said lock body comprises a mounting portion and a hook portion, the said hook portion has a first end and a second end, the said first end is connected with the said mounting portion, the said second end is bent toward the said mounting portion and there is a gap between the said second end and the said mounting portion, and a chamber is provided in the said mounting portion;
• a lock bolt, one end of the said lock bolt is inserted into the said chamber, and the said lock bolt has a first position and a second position;
• in the said first position, the said gap is blocked by the said lock bolt, and a closed ring is formed by the said hook portion and a part of the said lock bolt;
• in the second position, the said lock bolt is separated from the said hook portion;
• a force component, the said force component is used to keep the said lock bolt in the said first position under normal conditions;
• the said force component is a press spring or a torsion spring;
• a thumb wheel, the said thumb wheel is pivotally connected with the said mounting portion, the said thumb wheel is engaged with the said lock bolt, and the said lock bolt can be moved from the said first position to the said second position by drive the said thumb wheel;
• a plurality of slots are provided by the said lock bolt, the plurality of slots are spaced along the length direction of the said mounting portion, a plurality of gear teeth are provided by the said thumb wheel, and the said gear teeth cooperate with the said slots to achieve the engagement of the said thumb wheel and the said lock bolt;
• two lugs are provided by the side of the said mounting portion, and the said thumb wheel is arranged between the two said lugs;
• the said safety lock catch also contains a pin shaft, a pin hole is provided by the said thumb wheel, the said pin shaft is inserted into the said pin hole, and the two ends of the said pin shaft are respectively connected with the two said lugs;
• the plurality of the said gear teeth are distributed in an annular array with the said pin hole as the center, an anti slip surface is arranged on the peripheral wall of the said thumb wheel, an anti slip rib is provided by the said anti slip surface, and the pin hole is arranged between the said gear teeth and the said anti slip surface;
• the said anti slip surface is a curved surface with the said pin hole as the center, and the diameter of the said anti slip surface is greater than the diameter of the top circle of the gear teeth.