FIELD: transport.
SUBSTANCE: step 1 consists of sides 5 made by deep drawing from thin steel sheets, floor element 22 and under-step element 24 made by deep drawing. Arc B01 of said under-step element 24 features first radius R1 and second radius R2 at top and bottom zones, respectively. Note here that second radius R2 is a bit smaller than first radius R1. Arc B01 of said under-step element 24 smoothly changes in line U2 from one radius to another. Both said radii R1, R2 make interstep clearance between element 22 and element 24 does not depend upon under-step clearance. Said interstep clearance is always very small, for example, smaller than 2.8 mm.
EFFECT: reduced risks of jamming elements of clothes, sharp articles, kids' fingers or other articles.
11 cl, 9 dwg
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