As two very important hardware fittings, the sliding brace and single point latch of doors and windows play a key role in the door and window system, but many people ignore its role.
Sliding brace
1. Self positioning force of sliding brace
The performance of the sliding brace used for the internal and external casement windows must be no less than 40n, otherwise the switch positioning ability of the window sash becomes unstable, which will make it difficult to open and close the window.
2. Window opening and closing force
The proportion of sliding brace for internal and external casement windows shall not exceed 40n. Within the opening range of 0-300mm window sash, the opening and closing force of sliding brace commonly used for external upper suspension windows shall not exceed 40n.
3. Door and window clearance
When the window sash is in the closed state, under the action of external force, the sealing gap transition value between the sash and frame at the window corner where the sliding brace is installed shall not exceed 0.5mm.
4. Rigidity of sliding brace
To judge the rigidity of the sliding brace, it is necessary to judge according to the test, that is, the window sash is subjected to different forces at three different parts to distinguish whether the performance of the sliding brace meets the requirements.
(1) After the window sash is subject to 300N resistance in the process of being enabled to a large opening range, it can still be enabled normally and still meet the requirements of excellent self positioning force, opening and closing force and window sash and window frame clearance.
(2) When the window sash is closed, it is subject to 300N friction resistance, the switch of the window sash can still be started normally, and the requirements for its own positioning force, opening and closing force, and the gap between the window sash and window frame are still excellent.
(3) Under the condition that the positioning equipment is opened to the positioning point, the window installed with positioning equipment can still meet the normal opening of the window and the requirements for the positioning force, opening and closing force of the window itself and the gap of the window sash and window frame after withstanding the external force of 300N.
5. Multiple opening and closing
The repeated opening of window sashes for 25000 times is an inevitable experiment for doors and windows. Only after 25000 times of repeated opening and closing, the opening and closing force of doors and windows should not exceed 80N, which is considered qualified.
6. Slip brace strength
After the window sash is opened, the sliding brace is used to bear the pressure of 1000N for 5 minutes. Under the condition that all parts of the sliding brace are intact, the sliding brace of the door and window is qualified.
Single point latch
1. Strength of locking parts
Before leaving the factory, the locking parts of the single point locking device need to pass the 400N pressure test for many times, and can only leave the factory after passing the test. When in normal use, the operating force of the single point locking device is less than 20n.
2. Multiple closure
After 15000 times of repeated tests, the single point locking device shall be opened andclosed in normal operation, which is considered as a qualified locking device.