A safety belt coupling device includes a buckle having a hollow body provided with a front tongue receiving opening and an upwardly projecting latch member having an inclined front face. A coupling tongue having a front latch opening is slideable through the tongue receiving opening over the latch member to bring the latch opening into engagement with the latch member. A transverse lock bar is longitudinally movable between a lock position overlying the free end of the latched tongue to prevent the raising thereof and an unlock position rearward of the tongue free end to permit unlatching of the tongue and is biased to its unlock position. The lock bar lies in the path of the raised tongue free end and a finger actuated release member upon depression retracts the bar to its unlock position, and in one form includes a member rockable about a transverse axis and having cam slots engaging the lock bar, and in another form includes a longitudinally slideable push member lost motion coupled to the lock bar.
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