Abstract: A side release buckle is disclosed to have a center lock formed of a hooked portion at the free end of the center bar of the male buckle member and a hook hole in the bottom wall of the female buckle member to reinforce the strength of the connection between the locking bars of the male buckle member and the respective side notches of the female buckle member. The locking bars each have a wedge block for lifting the free end of the center bar to unlock the center lock when the user squeezed the locking bars inwards to disengage the locking bars from the side notches of the female buckle member.

Abstract: A safety buckle is disclosed to include two female buckle members respectively fastened to the two distal ends of a belt, each buckle member having a receiving open chamber and recessed engagement portions at top and bottom sides inside the receiving open chamber, and a male buckle member for joining the female buckle members, the male buckle member having two plug units for insertion into the receiving open chambers of the female buckle members respectively, each plug unit having raised engagement portions at the top and bottom sides thereof for engaging the recessed engagement portions of the respective female buckle member.