Cavity door rollers

1. A wheel carriage assembly including at least a pair of laterally spaced wheels mounted to opposed ends of a first common shaft, said first common shaft being supported intermediate said opposed ends by a first bearing mounted in a support structure of said wheel carriage assembly whereby said laterally spaced wheels rotate with said first common shaft relative to said support structure, at least one of said pair of laterally spaced wheels having a bore through which said first common shaft passes, one of either said bore or said first common shaft having a first projecting formation received within a first recessed zone formed in the other of either said bore or said first common shaft, said first recessed zone having a first axial length, said first projecting formation having an axial length less than the first axial length of the first recessed zone whereby the at least one of said pair of laterally spaced wheels has limited axial movement relative to said first common shaft, said limited axial movement being restrained by said projecting formation engaging axial ends of said first recessed zone.

2. A wheel carriage assembly according to claim 1 further including connector means enabling the support structure to be connected, in use, to a sliding door or other sliding panel.

3. A wheel carriage assembly according to claim 1 wherein both said wheels of said pair of spaced wheels and said first common shaft include said first projecting formation and said first recessed zone so that both said wheels have limited axial movement relative to said first common shaft.

4. A wheel carriage assembly according to claim 1 further including a further pair of laterally spaced wheels mounted to opposed ends of a second common shaft spaced from said first common shaft, said second common shaft being supported at an intermediate location by a second bearing mounted in said support structure, said further pair of laterally spaced wheels being rotatable with said second common shaft relative to said support structure, each said wheel of said further pair of wheels is axially fixed relative to said second common shaft.

5. A wheel carriage assembly according to claim 1 further including a further pair of laterally spaced wheels mounted to opposed ends of a second common shaft spaced from said first common shaft, said second common shaft being supported at an intermediate location by a second bearing mounted in said support structure, said further pair of laterally spaced wheels being rotatable with said second common shaft relative to said support structure, one only of said further pair of wheels is mounted to said second common shaft whereby said one wheel has limited axial movement relative to said second common shaft.

6. A wheel carriage assembly according to claim 1 further including a further pair of laterally spaced wheels mounted to opposed ends of a second common shaft spaced from said first common shaft, said second common shaft being supported at an intermediate location by a second bearing mounted in said support structure, said further pair of laterally spaced wheels being rotatable with said second common shaft relative to said support structure, both said wheels of said further pair of wheels have limited axial movement relative to said second common shaft.

7. A wheel carriage assembly according to claim 1 wherein said first projecting formation extends inwardly from a surface of said bore and said first recessed zone is formed in said first common shaft.

8. A wheel carriage assembly according to claim 7 wherein said first recessed zone is a circumferential groove formed in said first common shaft.

9. A wheel carriage assembly according to claim 8 wherein a second one of said wheels mounted to opposed ends of said first common shaft has a bore through which said first common shaft passes, the bore of said second one of said wheels having an inwardly extending second projecting formation received within a second recessed zone formed in said first common shaft, said second recessed zone having a second axial length, said second projecting formation having an axial length less than said second axial length of said second recessed zone whereby said second one of said wheels has limited axial movement relative to said first common shaft.

10. A wheel carriage assembly according to claim 9 wherein said second recessed zone is formed as a circumferential groove in said first common shaft.

11. A wheel carriage assembly according to claim 1 wherein a first recessed zone is formed in a surface of said bore with said first projecting formation extending outwardly from said first common shaft, said first recessed zone having a first axial length, said first outwardly directed formation having an axial length less than the first axial length of the first recessed zone in said bore.

12. A wheel carriage assembly according to claim 11 wherein said first recessed zone in said bore is a circumferential groove in said bore.

13. A wheel carriage assembly according to claim 11 wherein a second one of said wheels mounted to opposed ends of said first common shaft has a bore within which said first common shaft is positioned, said bore having an axially extending second recessed zone having a second axial length, said first common shaft having a second projecting formation extending outwardly and received in said second recessed zone, said second projecting formation having an axial length less than the second axial length of the second recessed zone in said bore.

14. A wheel carriage assembly according to claim 13 wherein said second recessed zone in said bore is a circumferential groove.