Device for providing multi-directional movement

1. A device for providing multi-directional movement comprising:

a housing having at least one main roller located therein, the housing having a first end defining an opening through which a part of the main roller extends, and a tapering second end, wherein the second end and a generally vertical inner wall portion of the housing define a cavity in which the main roller is located, the second end comprising a second-end wall portion which is inclined relative to the generally vertical inner wall portion of the housing;

at least one bearing means comprising an annular member with a plurality of openings in which support rollers are located for contacting a surface part of the or each main roller, the surface part being a surface part of the roller oriented towards the second end of the housing, and wherein at least some of the support rollers are seated in the openings so that parts of their surfaces protrude further towards the first end of the housing than does the annular member in which they are located;

a recessed circular region, provided in the inclined second-end wall portion, for accommodating the support rollers, the recessed circular region being spaced apart inwardly from, and having a substantially smaller diameter than, the generally vertical inner wall portion of the housing;

a centring mechanism for preventing contact between the main roller and the inner wall portion of the housing and comprising a plurality of centring rollers for contacting a peripheral portion of the or each main roller;

retainer for retaining the centring mechanism in position in the housing around the or each main roller; and

brake for providing resistance to rotation of at least one main roller.

2. The device as claimed in claim 1 wherein the or each annular member is located between the or each main roller and the second end of the housing.

3. The device as claimed in claim 1 wherein all the support rollers are seated so that parts of their surfaces protrude further towards the first end of the housing than does the annular member in which they are located.

4. The device as claimed in claim 1 wherein at least some of the support rollers are seated so that parts of their surfaces protrude further towards the second end of the housing than does the annular member in which they are located.

5. The device as claimed in claim 4 wherein the brake comprises a brake pad located above the bearing means and configured to contact a top surface of at least one main roller.

6. The device as claimed in claim 5 wherein the brake is able to be forced by an urging means mechanism through the annular member into contact with the main roller.

7. The device as claimed in claim 1 wherein the openings each comprise a hole through the annular member which has a diameter which varies in the direction of thickness of the annular member and which has a minimum diameter which is less than the diameter of the support roller located therein.

8. The device as claimed in claim 1 wherein the retainer is screwed into the bottom of the housing.

9. The device as claimed in claim 8 wherein the centring mechanism comprises a peripheral race with the plurality of centring rollers located therein to contact the peripheral portion of the or each main roller.

10. The device as claimed in claim 9 wherein the retainer comprises a skirting device which is able to be screwed into the bottom of the housing.

11. The device as claimed in claim 9 wherein the retainer comprises a circlip.

12. The device as claimed in claim 1 wherein the centring housed in a circular recessed region of the housing located approximately at the equatorial region of the one or more main rollers.

13. The device as claimed in claim 12 , wherein the main roller is a spherical ball.

14. The device as claimed in claim 1 wherein the brake comprises a braking member which is configured to be urged into contact with at least one main roller.

15. The device as claimed in claim 1 wherein the main roller is able to move in any direction.