Mechanical locking system for floor panels
Floor panels are shown, which are provided with a vertical locking system on short edges including a displaceable tongue that is displaced in one direction into a tongue groove during vertical displacement of two panels. Building panels provided with a locking system for vertical locking of a first and a second building panel by a vertical displacement of the panels relative each other, a displaceable tongue is in a sidewardly open displacement groove provided at an edge of a first panel, said tongue cooperates with a tongue groove provided at an adjacent edge of a second panel for locking the edge and the adjacent edge vertically.
1. Building panels, comprising
a first building panel,
a second building panel, and
a displaceable tongue arranged in a sidewardly open displacement groove provided at an edge of the first building panel,
wherein the displaceable tongue comprises a pulling extension configured to cooperate with a pulling protrusion formed at an adjacent edge of the second building panel such that the displaceable tongue is linearly pulled out from the sidewardly open displacement groove and into a tongue groove provided at the adjacent edge of the second building panel when the edge of the first building panel and the adjacent edge of the second building panel are displaced vertically relative to each other, and
wherein the displaceable tongue comprises a locking hook.
2. Building panels as claimed in claim 1 , wherein the locking hook is configured to serve as a friction connection.
3. Building panels as claimed in claim 1 , wherein the locking hook is configured to prevent the displaceable tongue from falling out from the displacement groove after locking of the first and second building panels.
4. Building panels as claimed in claim 1 , wherein the locking hook is configured to prevent the displaceable tongue from sliding back into the displacement groove after locking of the first and second building panels.
5. Building panels as claimed in claim 1 , wherein the locking hook is configured to lock against an upper part or lower part of the displacement groove.
6. Building panels as claimed in claim 1 , wherein the locking hook is configured to slide against a bevel formed at the displacement groove.
7. Building panels as claimed in claim 1 , wherein cavities are formed on the displaceable tongue.
8. Building panels as claimed in claim 7 , wherein the cavities are formed at a tongue section where locking hooks including the locking hook are formed.
9. Building panels as claimed in claim 1 , wherein the locking hook comprises a hook part that is configured to press the hook connection upwards by rails during insertion of the displaceable tongue into the displaceable groove.
10. Building panels as claimed in claim 1 , wherein the displaceable tongue is configured to cooperate with the tongue groove for locking the edge of the first building panel and the adjacent edge of the second building panel vertically.
11. Building panels as claimed claim 1 , further comprising a strip that protrudes:
below the displacement groove and outwardly beyond an upper part of the edge of the first building panel; or
below the tongue groove and outwardly beyond an upper part of the adjacent edge of the second building panel,
wherein a locking element provided on the strip is configured to cooperate with a locking groove of the second building panel for horizontal locking of the first and second building panels.
12. Building panels as claimed in claim 11 , wherein an upper part of the locking element of the first building panel is located vertically below a tongue-locking surface of the pulling extension in a locked state of the building panels.
13. Building panels as claimed in claim 1 , wherein the pulling extension is provided at an outer part of the displaceable tongue.
14. Building panels as claimed in claim 1 , wherein the displaceable tongue is separate from the panels.
15. Building panels as claimed in claim 1 , wherein the displaceable tongue is formed by injection moulding.
16. Building panels as claimed in claim 1 , wherein a part of said pulling protrusion forms a part wall of the tongue groove.
17. Building panels as claimed in claim 1 , wherein the pulling extension and the pulling protrusion are inclined in relation to a main horizontal plane of the first and second building panels.
18. Building panels as claimed in claim 1 , wherein the locking hook locks against an outer part of the sidewardly open displacement groove.
19. Building panels as claimed in claim 1 , wherein the first and second building panels are floor panels.
20. Building panels, comprising
a first building panel,
a second building panel, and
a displaceable tongue arranged in a sidewardly open displacement groove provided at an edge of the first building panel,
wherein the displaceable tongue comprises a pulling extension configured to cooperate with a pulling protrusion formed at an adjacent edge of the second building panel such that the displaceable tongue is pulled out from the sidewardly open displacement groove and the pulling extension is pulled into a tongue groove provided at the adjacent edge of the second building panel when the edge of the first building panel and the adjacent edge of the second building panel are displaced vertically relative to each other, and
wherein the displaceable tongue comprises a locking hook.
21. Building panels, comprising
a first building panel,
a second building panel, and
a displaceable tongue arranged in a sidewardly open displacement groove provided at an edge of the first building panel,
wherein the displaceable tongue comprises a pulling extension configured to cooperate with a pulling protrusion formed at an adjacent edge of the second building panel such that the displaceable tongue is pulled out from the sidewardly open displacement groove and into a tongue groove provided at the adjacent edge of the second building panel when the edge of the first building panel and the adjacent edge of the second building panel are displaced vertically relative to each other, and
wherein the displaceable tongue comprises a locking hook, and the locking hook is configured to be pulled out from the sidewardly open displacement groove, when the edge of the first building panel and the adjacent edge of the second building panel are displaced vertically relative to each other, into a locking position at which the locking hook locks against the first panel.