LOCK BOLTHEAD Russian patent published in 2001 - IPC

FIELD: locksmith's work. SUBSTANCE: the lock bolt-head has at least one rotary working boss (1) for the lock latch, the first blocking system (2) formed by blocking sleeve (7) with a bottom (5), having on the outer side at least one of the working bosses (1) and in its body at least one hole (8) with an expansible member (9) installed in it, as well as the second blocking system (10) for a radial contact with the key, provision is made for an axial transfer cavity (6) for a non-rotary insertion of the front end of the key made in the bottom (5) of the blocking sleeve (7), and the second blocking system (10) is formed by a hollow non-rotary sleeve (11), which is coaxially closed at least on the outer side of the block sleeve (7). Hole (8) in the body of the blocking system for the expansible member (9) is made radial, the second blocking system (10) has lifting means (12) for each expansible member (9) made for radial slipping, and the radial holes (8) for the expansible members (9) are positioned in the blocking sleeve (7) at least in one spiral, the arrangement of the spiral coincides with the arrangement of the lifting means in the larger cylindrical ring (111) and in the smaller cylindrical ring (112) of the hollow non-rotary sleeve (11) that can slip in the radial direction. EFFECT: enhanced resistance to breaking in. 4 dwg