Patent EA-004355-B1 (EA)
Title: Door lock with a hook bolt
Inventor: HAAANIEMI JOUNI
IPC: E05B63/12
Filed: 2001-08-16
Abstract: 1. A door lock, comprising a housing-like lock case (1) provided with a front plate (3) and including a hook bolt (4, 5, 6), which is movable between a locking and a releasing position by means of a key (9) of the lock or other force transmission element and comprises a linearly movable guiding part (5) and a separate hook part (6) turnably journalled on the end thereof and which is arranged in cooperation with a striking plate (14) in a door frame (13) so that in its locking position the hook part (6) of the hook bolt (4, 5, 6) is moved through an opening (14a) in the striking plate and is turned towards an inner surface (14b) in the striking plate, characterized in that the hook bolt (4, 5, 6) comprises a pivot arrangement by means of which the hook part (6) is movable with regard to the guiding part (5) in the longitudinal direction of the front plate (3), and in that the lock case (1) includes a guiding groove (8, 8a, 8b) for guiding the pivoting point of the hook part (6) both in the longitudinal direction of the front plate (3) and in the direction of movement of the guiding part (5). 2. A door lock according to claim 1, characterized in that the pivot arrangement of the hook part (6) is accomplished by means of a pivot pin (7), which is movably supported to a guiding groove (5a) arranged in the guiding part (5) and extending mainly in the longitudinal direction of the front plate (3). 3. A door lock according to claim 1 or 2, characterized in that the shape of the guiding groove (8, 8a, 8b) in the lock case is selected so that in the first phase of the movement of the hook bolt (4) out into the protruding position the pivoting point (7) of the hook part (6) is moved at the same time downwards with regard to the front plate (3). 4. A door lock according to any one of the preceding claims, characterized in that the shape of the guiding groove (8, 8a, 8b) in the lock case is selected so that when the hook part (6) is moved out from an opening (3a) for the bolt in the front plate the guiding groove (8, 8a, 8b) extends substantially only in the direction of the movement of the guiding part (5). 5. A door lock according to any one of the preceding claims, characterized in that the lock case includes a guiding surface (17) which, after the hook part (6) is moved through the opening (14a) for the bolt in the striking plate, is arranged to guide the hook part (6, 6b) so that it is turned with regard to its pivoting point (7) inside the striking plate (14) into its locking position. 6. A door lock according to any one of the preceding claims, characterized in that at the front plate (3) side end of the guiding groove (8, 8a, 8b) in the lock case at the position corresponding to the locking position of the hook part (6) there is an extension part (8c) in the guiding groove extending upwards in the longitudinal direction of the front plate (3) and separated from the guiding groove (8, 8a, 8b) by means of a connection piece (16), and in that said connection piece (16) is fixed to the lock case (1) through shallow parts (16a) which can be broken with said pivot pin (7). 7. A door lock according to claim 6, characterized in that the upper surface of the hook part (6) includes a recess (6a) which is arranged in cooperation with the upper edge of the opening (3a) for the bolt in the front plate to prevent moving of the hook bolt (4) inside the lock case after said connection piece (16) is broken by means of said pivot pin (7). 8. A door lock according to any one of the preceding claims, characterized in that the hook part (6) is so dimensioned that in its fully protruding locking position it fills the major part of the opening (14a) of the striking plate in the longitudinal direction of the front plate (3) preventing thereby moving of the door out from its hinges. 9. A door lock according to any one of the preceding claims, characterized in that the guiding part (5) of the hook bolt is continuously located inside of the lock case (1).