Strap buckle with self-locking function

A strap buckle with self-locking function, incorporating a frame shaped holder (15) with a shaft (11) provided between the opposite inner long sides of the frame, about which shaft is pivotably supported a double-armed locking member (12), which is adapted to cooperate with one end gable (21) of the frame, thereby locking a part (19) of a strap situated between the locking member (12) and said end gable, and which locking member under actuation of an external force (A) is pivotable about the shaft against the action of a resilient member, characterized therein,

• that both arms (20,22) of the two-armed locking member (12) are situated inside the outer frame (18,21) of the holder (15),
• that the locking member (12) is provided with a transverse groove (13) arranged between its arms (20,22) and having a non-round, oblong cross-section,
• that the shaft (11) is designed with a non-round, elongated cross-sectional shape mainly corresponding to that of the groove (13),
• that the resilient member is an integral part of the locking member (12), whereby the portions (25) about the groove (13) are elastically resilient, and that the holder (15) as well as the locking member (12) are manufactured from plastic material and are held together solely by that the locking member with its groove (13) is fixed by being snapped upon the shaft (11) of the holder.