Surface water drainage system
A surface water drainage system according to the present invention includes a structure that can be installed in the ground, and a cover that can be laid onto an upper edge of the structure. Fixation devices that are attached to the cover include a locking system in a form of elastic hook elements fixed to edges of the cover that can be brought into snap-on engagement with other locking system on the structure in order to retain the cover on the structure.
1. Surface water drainage system, comprising:
a structure installed in the ground and having an upper edge with a frame thereon, said frame including a notch;
a cover having edges forming undercut sections with U-shaped profiles; and
a fixation device having a U-shaped portion and a portion with a nose, said U-shaped portion fitting within one of said undercut sections to lock said fixation device to said cover, said nose fitting within said notch to lock said cover to said structure.
2. Surface water drainage system according to claim 1 , wherein said cover comprises a cast metal grating.
3. Surface water drainage system, comprising:
a structure installed in the ground and having an upper edge with a frame thereon;
a cover having edges forming undercut sections with U-shaped profiles; and
a fixation device with first means for locking said fixation device on said cover to said frame on said structure and with second means for locking said fixation device to one of said undercut sections of said cover.
4. Surface water drainage system according to claim 3 , wherein said second locking means detachably fixes said fixation device to the cover.
5. Surface water drainage system according to claim 3 , wherein said second locking means fixes said fixation device to the cover without use of tools.
6. Surface water drainage system according to claim 3 , wherein said second locking means comprise flexible elements adapted such that less force is required to change a shape of the elements during mounting to the cover than during detachment from the cover.
7. Surface water drainage system according to claim 3 , wherein said second locking means comprise tensioning devices that press the first locking means against the cover to ensure fixation without play.
8. Surface water drainage system according to claim 3 , wherein said fixation device is constructed as a spring from a bent strip of material.
9. Surface water drainage system according to claim 8 , wherein said fixation device is fixed within said undercut sections of the cover by means of a tab that has been bent outward from the strip of material.
10. Surface water drainage system according to claim 9 , wherein the cover in the region of each of said undercut sections defines an aperture to engage the tab.
11. Surface water drainage system according to claim 3 , wherein said second locking means comprise elastomer bodies.