New key system DU

Experience, ingenuity and customer empathy still lead to innovative and comprehensive security solutions in the field of mechanical locking cylinders. One case in point is the market launch of the new DU key section series that CES now presents for upscale commercial and industrial buildings. The CES key system DU is the outcome of a consistent innovation strategy which focuses and fosters the know-how of all employees of the company. The letters "DU" refer to the most important innovation that offers protection against unauthorized duplication of keys: the "Double Undercut" on the sides of the new key section. The resulting three-dimensionally shaped groove cannot be reproduced with the current key-copying techniques as they are only effective in two dimensions. By the way: also the manufacturing process developed by CES for the lateral profiling of the key in a single CNC operation has been granted patent protection.

The key system enjoys patent protection until 2030 and can be adapted in several steps to match the widest range of tendering requirements. Depending on its equipment, it satisfies the highest requirements of DIN 18252, DIN EN 1303 and VdS guidelines. The CES key itself impresses with its high-quality look and pleasant feel and the easy transmission of the key torque. It goes without saying that the DU key system can always be combined with electronic locking and access control solutions available from CEStronics. Special designs such as sea-water resistant and wear-resistant versions of the cylinder and the suitability for fire doors extend the range of applications of the DU system.  

The complete security package of the new CES key system DU offers a maximum of burglar protection and – thanks to the double undercut – also full protection against unauthorized duplication of the key. The specific security features include:

Spring-loaded swivelling levers – safe locking against rotation

The new DU locking cylinder has two swivelling levers on one side that perform a double security scan along the key section and thus also protect against picking with bump keys. Both swivelling levers are held in their initial position by a pressure spring. The solid locking bar arranged behind them is pressed by a spring into a groove of the hull and thus effectively secures the plug against rotation. An authorized key has two undercuts of a defined depth and position on the side of the key. They serve to put the grooves of the swivelling levers  in exactly the correct position. Now the projections on the locking bar can latch and the blockage is cleared. However, when an unauthorized key is inserted, the swivelling levers remain in their initial position, the projections on the locking bar are prevented from latching, the locking bar cannot move into the plug and the cylinder plug cannot be rotated.  

Lateral coding – visible added security

On the side opposite to the swivelling levers, up to five horizontal control pins that can be variably inserted are integrated in the DU cylinder as additional security elements. Unauthorized keys do not have the corresponding dimples, and when such a key is inserted, the control pins are pressed out into the hull groove and the cylinder plug cannot be rotated. When an authorized key is inserted, however, the control pins are pressed towards the cylinder plug, which is thus freed for rotation. This lateral coding is an added security feature that is readily apparent to the user and gives the key a high-quality and particularly secure appeal.

Spring-loaded anti-drilling and anti-pulling protection "BZ3" –  additional blocking function by undercut scanning

Apart from the standard anti-drilling and anti-pulling protection with anti-drilling plate and hard metal pins, the new CES cylinders has a spring-loaded locking element made of hardened special steel that engages the groove of the cylinder hull and thus blocks the plug against rotation. This locking element performs a contour-controlled security scan along the key section. If the key has the copy-protected rib with the undercut, this rib will pull the locking element back into the cylinder plug which can then be rotated.