| 摘要 |
A numerical combination lock 1 has a turning knob 3, by means of which a cam plate 4 can be turned in order to operate a drop lever 5 that is hinged to a locking bolt 2 of the lock 1 and in this way to draw the locking bolt back to the open position. This can be done only by means of the correct selection of an opening combination which, also with the aid of the turning knob 3, has to be set through repeated turning. Following each setting, the turning knob 3 can be displaced in an axial direction in order to operate a switch 11 on a printed circuit board 35 each time in accordance with that particular setting value. In this way, an electric motor 12 is controlled that moves a coupling member 14 on a sliding bar 13 into the area of a first working surface 15 of the cam plate 4, if the correct opening combination has been entered. The sliding bar 13 has a fixed projection 20 that faces the cam plate 4, and the cam plate 4 has a second working surface 21, which comes into a working relationship with the projection 20 during the turning back of the cam plate 4 to close the locking bolt 2. The sliding bar 13 is thus forced back to its original position as a result of the turning of the cam plate 4 during the closing of the lock 1, even in the event that a resetting spring 22, which may be provided, malfunctions. As a result, after being closed, the lock 1 is always ready for its next opening procedure, even if a resetting spring 22 were to fail to move the sliding bar 13.
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