Fitted bottom bed sheet - is adaptable for three sizes of mattress and has cut out corners at acute angle and rounded adjacent sections

摘要

The tight-fitting bottom sheet for bedding can be used for three sizes of mattress. The corners of the fitted sheet are cut out and consist of an inner acute angle which, towards the outer edge, turns into a curve. The edges of the sheets are hemmed and an elastic cord threaded through the outside hem. The four corners of the (4) acute angles of the cut out sections are 190 cm apart in length (13) and 90 cm apart in width (2). The acute angles are less than 45 degrees whereas the curved parts adjacent to the acute angles form part of circle arcs with a radius of 165 mm. The chords of the partial circle arcs form an obtuse angle with an aperture of roughly one hundred and ten degrees. The sides of the acute angles are straight for 50 mm before curving.