Lock for safety belt

A lock for a safety belt, comprising:

• a buckle housing of generally parallelepiped construction, said buckle housing having a top wall, a bottom wall, a pair of transversely spaced apart side walls, a front wall and a back wall;
• an insertion opening formed in said front wall and an access opening formed in said top wall;
• a generally U-shaped latch member having a pair of parallel limbs interconnected by a bight section, each limb of said parallel limbs having a base integrally formed with said bight section, said U-shaped latch member being disposed within said buckle housing;
• a transversely extending pivot pin extending through said side walls of said buckle housing and through said U-shaped latch member to pivotally mount said U-shaped latch member with respect to said buckle housing;
• a latch dog being formed on a first limb of said pair of parallel limbs;
• a bias means disposed between said pair of limbs, a first end of said bias means being supported by said bight section;
• a first lock tongue sized to enter into said buckle housing through said insertion opening formed in said front wall of said buckle housing, said first lock tongue having a leading edge that compresses said bias means and causes said U-shaped latch member to pivot about said pivot pin upon introduction of said first lock tongue into said buckle housing;
• said first lock tongue having a hook for engaging said latch dog when said first lock tongue is fully inserted into said buckle housing, said engagement maintaining said first lock tongue within said buckle housing;
• said first lock tongue hook being disengaged from said latch dog by an externally imparted force that pivots said U-shaped latch member away from said first lock tongue so that said hook and latch dog disengage so that said first lock tongue may be withdrawn from said buckle housing, said externally imparted force being applied to said U-shaped latch member through said access opening formed in said top wall of said buckle housing.