Safety belt buckle

A seat belt buckle comprising:

• an inlet slot for receiving a tongue;
• a latch movable between lock and unlock positions, said latch including a latching surface for engagement with said tongue when said latch is in its lock position whereby said tongue is retained in said buckle, said latch including a lock bar receiving surface, said latch normally being disposed in its unlock position;
• a push button slidably disposed in said buckle;
• a push button spring biasing said push button to a forward position, said push button being movable against the bias of said spring to a rearward position at which said latch is moved to its unlock position to release said tongue;
• a lock bar slidably movable with said push button, said lock bar normally being spaced from said lock bar receiving surface of said latch, said lock bar being movable into engagement with said lock bar receiving surface of said latch upon insertion of said tongue into said buckle and movement of said latch to its lock position to retain said latch in said lock position, said lock bar being movable out of engagement with said lock bar receiving surface upon movement of said push button to its rearward position to release said latch from its lock position;
• and
• an ejection bar for ejecting said tongue from said buckle when said push button is moved to its rearward position;
• said latch comprising cam means engagable by said lock bar, said cam means comprising an upstanding element having a curved underside surface adjacent a slot, said slot defining said lock bar receiving surface, said lock bar being movable along said underside surface to move said latch into its lock position, and said lock bar being further movable along said underside surface into said slot, whereby said latch is retained in its lock position.