Rack adjustment mechanism for an article cleaning apparatus

1 . A dishwasher having an adjustable article rack comprising:

a pair of horizontal slide assemblies attached to opposed sidewalls in the dishwasher;

a vertically extending member attached to each slide assembly;

a vertically movable member attached to each extending member, said vertically movable member and said extending member cooperating to form a self correcting ratchet mechanism; and

a rack for holding articles in the dishwasher, the rack being fixed to said vertically movable members, and vertically adjustable as said vertically movable member are moved vertically.

2 . The dishwasher of claim 1 wherein said rack is formed from a plurality of interconnected horizontal and vertical wire segments.

3 . The dishwasher of claim 2 wherein said movable members are attached to horizontal wire segments.

4 . The dishwasher of claim 3 wherein each said vertically extending member is T shaped with a base and a leg, the base being attached to said slide assembly and the leg extending upward from said slide assembly.

5 . The dishwasher of claim 4 wherein said vertically movable member comprises an inner and an outer housing connected to said T shaped member.

6 . The dishwasher of claim 5 wherein said T shaped member includes a plurality of vertically extending ratchet indentation members, a pawl engageable with said ratchet indentations, and a spring to provide torque to said pawl.

7 . The dishwasher of claim 6 wherein the leg portion of said T shaped member further includes upper and lower reset openings formed above and below said ratchet indentations.

8 . The dishwasher of claim 6 wherein said ratchet indentation member is recessed below the surface of said T-shaped member.

9 . The dishwasher of claim 5 wherein said T shaped member includes a vertically extending rack portion formed in the leg portion of said T shaped member facing said inner housing and said inner housing includes a projection holding an indicator wheel and gear in mesh with said rack portion.

10 . The dishwasher of claim 9 wherein said gear rotates as said rack is raised and lowered and indicia of the rack position formed in said indicator wheel are visible through an opening in said projection.

11 . The dishwasher of claim 5 wherein said T shaped member includes a elongated vertical slot in the leg portion facing said inner housing and said inner housing includes a projection inserted into said vertical slot for limiting the travel of said inner housing to the length of said elongated slot.

12 . The dishwasher of claim 1 wherein said slide assemblies move in and out of the dishwasher for loading and unloading of the articles.

13 . A method for adjusting the position of a rack in a dishwasher comprising:

fixing a horizontal slide assembly to opposed interior walls of said dishwasher;

mounting a self-correcting ratchet mechanism to the rack;

attaching a fixed portion of said self-correcting ratchet mechanism to said horizontal slide assemblies;

vertically moving said rack relative to said horizontal slide assemblies by activating said self-correcting ratchet mechanism; and

automatically resetting said self-correcting ratchet mechanism at the top and bottom of the range of adjustment of said rack.

14 . The method of claim 13 wherein said self-correcting ratchet mechanism includes a spring loaded pawl member and wherein the step of automatically resetting said self-correcting ratchet mechanism includes:

rotating said pawl into a reset opening at the top and bottom of a range of adjustment of said rack.

15 . The method of claim 13 further including measuring and indicating the vertical position of said rack.

16 . The method of claim 15 wherein measuring and indicating the vertical position of said rack includes:

moving a gear member as a function of vertical position of said self-correcting ratchet mechanism; and

driving a rack position indicia with said gear member.