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2. Anti-slip grating - Wikipedia

   en.wikipedia.org/wiki/Anti-slip_grating

   Anti-slip steel grating (also known as slip-resistant grating) is a type of bar grating designed to prevent slippage. Steel bar grating is manufactured in a variety of methods. Welded bar grating consists of load bars electrically fuse welded to cross bars. Pressure-locked bar grating, or swaged grating, is where steel rods are forced through ...

3. Continuous track - Wikipedia

   en.wikipedia.org/wiki/Continuous_track

   An agricultural tractor with rubber tracks, mitigating soil compaction. A Russian tracked vehicle designed to operate on snow and swamps. A British Army Challenger 1 tank. Continuous track or tracked treads are a system of vehicle propulsion used in tracked vehicles, running on a continuous band of treads or track plates driven by two or more ...

4. Stair nosing - Wikipedia

   en.wikipedia.org/wiki/Stair_nosing

   Tread nosing. The horizontal projection to the front of a tread where most foot traffic frequently occurs. The nosing is the protrusion beyond the riser when vertical risers are used, or beyond the back of the tread below, when angled risers or no risers are used. Anti-slip strips or nosings may be applied. These stair parts can be manufactured ...

5. Escalator - Wikipedia

   en.wikipedia.org/wiki/Escalator

   Escalator. For the album by Sam Gopal, see Escalator (album). An escalator is a moving staircase which carries people between floors of a building or structure. It consists of a motor -driven chain of individually linked steps on a track which cycle on a pair of tracks which keep the step tread horizontal.

6. Stair tread - Wikipedia

   en.wikipedia.org/wiki/Stair_tread

   Stair tread. A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations.

7. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   These stairs often (including this example) illustrate the mathematical principle of glide plane symmetry: the mirror image with respect to the vertical center plane corresponds to a shift by one step. Alternating tread stairs are sometimes referred to as "witches stairs", in the supposed belief that they were created during an earlier era as ...