wedge fold / T- catch

The patented ‘Keilfalz’ – an exclusive Kneer-Südfenster safety mechanism

The patented ‘Keilfalz’ safety mechanism works on the principle of an interlocking groove on the hinge side of the door leaf and a matching groove along the adjoining frame. The grooves interlock on shutting making the door leverage-proof – in the process WK2 criteria are fulfilled.

The safety catch

It does not compromise the appearance of your front door, but offers large-scale additional safety and security. Your front door can only be opened to a small gap, facilitating “secure” contact with the visitor. It is impossible for the door to be pushed open from outside.