Dishwasher rack assembly with adjustable tines

A dishwasher appliance, comprising:

• a tub;
• and
• a rack assembly positioned within said tub, said rack assembly comprising:
• a bottom wall formed of spaced apart lateral rods crossed by spaced apart longitudinal rods to define an open lattice structure;
• a plurality of fixed vertical tines extending upward from said bottom wall, said fixed vertical tines arranged in pairs along a longitudinal or lateral aspect of said bottom wall with a defined space between adjacent ones of the fixed vertical tines of said pairs of fixed vertical tines;
• a rectangular member having a size so as to slide along said bottom wall between the fixed vertical tines of said pairs of fixed vertical tines, said rectangular member having longitudinal legs, said rectangular member having a width such that the longitudinal legs lie directly adjacent the fixed vertical tines of respective ones of said pairs of fixed vertical tines;
• a plurality of vertical tines extending upward from said rectangular member and arranged in pairs along said rectangular member, said plurality of vertical tines spaced apart along the longitudinal legs with a spacing corresponding to said defined space between said pairs of fixed vertical tines;
• and
• a securement mechanism configured between said rectangular member and said bottom wall, said securement mechanism accommodating relative movement and anchoring between said rectangular member and said bottom wall for variable positioning of the plurality of vertical tines relative to said pairs of fixed vertical tines, said rectangular member adjustable between a first anchored position wherein the plurality of vertical tines are spaced mid-way between said pairs of fixed vertical tines and a second anchored position wherein the plurality of vertical tines member are aligned with said fixed vertical tines.