| 摘要 |
The lack of adaptation of various models developed for satisfying an efficient safety system for door handle especially for children has been clearly assessed. In order to solve this problem, according to the invention and instead of using a low-safety and inconvenient lock, the handle is simply disassembled in order to replace the existing square with the advanced square (9) of the present invention. The square includes a threaded portion (11) and a tapped portion (10). One side of the door is secured, which is useful for cave-type parts, while the other side operates in a traditional manner. In order to actuate the bolt (2) the lever handle must first be raised in order to momentarily block the two portions of the square relative to each other. It is then possible to actuate the bolt by lowering the lever handle and unlocking the latter by applying, in a second time, a force having an amplitude higher than that required for the opening. |
