Patent ID: 8656566

Claim:
A buckle of a seat belt comprising: a seat belt buckle body having an end; a side; a body space formed in the seat belt buckle body; a buckle opening formed in the end of the seat belt buckle body and communicating with the body space; and a button opening formed in the side of the seat belt buckle body and communicating with the body space; a releasing button module pivotally mounted in the body space, partially projecting from the button opening and having a spring recess formed in the releasing button module and facing the buckle opening; an abutted portion mounted in the releasing button module and located between the spring recess and the buckle opening; and a hooking portion protruding from the releasing button module; a spring module having a button spring mounted in the body space at a position opposite to the button opening and abutting between the seat belt buckle body and the releasing button module; a buckle spring mounted in the spring recess and an end of the buckle spring abutting on a bottom of the releasing button module; and a buckle spring block mounted on an end of the buckle spring at a position opposite to the bottom of the releasing button module, and located between the buckle spring and the abutted portion; and a buckle module inserted in the body space, engaging the releasing button module, and abutting on the buckle spring block at a position opposite to the buckle spring, wherein the buckle spring block has an elongated block portion abutting on the buckle module and having a middle segment corresponding to and selectively abutting the abutted portion at that position; and the buckle module comprises a first buckle element selectively abutting the buckle spring block and having an inserting plate inserted in the body space and having a hooked end abutting the buckle spring block; and a positioning slot is formed in the hooked end of the inserting plate and accommodating a part of the abutted portion; and a second buckle element selectively abutting the first buckle element and having an inserting plate inserted in the body space; a hooking portion formed on a side of the inserting plate of the second buckle element at a position opposite to the inserting plate of the first buckle element and engaging the hooking portion of the releasing button module; and a positioning slot formed in the inserting plate and the hooking portion of the second buckle element and accommodating a part of the abutted portion.