Optical grade surfacing tool

1. An optical grade surfacing tool, comprising:

a rigid support having a transverse end surface;

an elastically compressible interface attached to the rigid support, the elastically compressible interface including a central part which is in line with the end surface of the rigid support, and a peripheral part that is disposed transversely beyond the end surface of the rigid support;

a flexible pad configured to be pressed against a surface to be worked, attached to the interface on the opposite side to the rigid support, the flexible pad including a central part that is in line with the end surface of the rigid support, and a peripheral part that is disposed transversely beyond the end surface of the rigid support; and

return spring means disposed between the rigid support and the peripheral part of the interface, the return spring means including a plurality of pairs of superposed elastically flexible blades that project transversely from the rigid support, a first of the blades having a distal portion cooperating in bearing engagement, through a first face, exclusively with the peripheral part of the interface, and a second of the blades cooperating in bearing engagement with the first blade exclusively via a second face of the distal portion on the opposite side to the first face,

wherein the combination of the peripheral part of the pad, the peripheral part of the interface, and the return spring means forming means for stabilizing the tool during surfacing, the tool being configured to perform surfacing essentially in the central part of the pad.

2. The tool according to claim 1 , wherein the distal portion of the first blade of each of the pairs is flat.

3. The tool according to claim 1 , wherein the second blade of each pair has a distal portion curved toward the associated first blade.

4. The tool according to claim 3 , wherein the distal portion of the second blade is curved in a rounded loop such that an end of the second blade is turned towards the rigid support.

5. The tool according to claim 1 , wherein the distal portion of the first blade and a distal portion of the second blade of each of the pairs are provided with longitudinal guide means.

6. The tool according to claim 1 , wherein the first blade of each of the pairs has a length such that the first blade extends transversely beyond the interface.

7. The tool according to claim 1 , wherein the return spring means are formed by a first star-shaped part and a second star-shaped part each of which include a central annular part from which a plurality of branches project radially, the branches of the first star-shaped part forming the first blades and the branches of the second star-shaped part forming the second blades.

8. The tool according to claim 7 , wherein the rigid support includes a body and a head, the central part of the first star-shaped part and the central part of the second star-shaped part being clamped between the body and the head.

9. The tool according to claim 1 , wherein the rigid support is part of a base including a flexible collar around the support, the elastically compressible interface being pressed against and covering an end surface of the collar located on the same side as the end surface.

10. The tool according to claim 9 , wherein the base includes a rigid core having a transverse end surface and a flexible backing plate pressed against and covering the end surface, the rigid support being formed by the rigid core and a central part of the backing plate located in line with the transverse end surface of the core, the collar being formed by a peripheral part of the backing plate extending transversely beyond the end surface of the rigid core.

11. The tool according to claim 2 , wherein the second blade of each pair has a distal portion curved toward the associated first blade.

12. The tool according to claim 2 , wherein the distal portion of the first blade and a distal portion of the second blade of each of the pairs are provided with longitudinal guide means.

13. The tool according to claim 2 , wherein the first blade of each of the pairs has a length such that the first blade extends transversely beyond the interface.

14. The tool according to claim 2 , wherein the return spring means are formed by a first star-shaped part and a second star-shaped part each of which include a central annular part from which a plurality of branches project radially, the branches of the first star-shaped part forming the first blades and the branches of the second star-shaped part forming the second blades.

15. The tool according to claim 2 , wherein the rigid support is part of a base including a flexible collar around the support, the elastically compressible interface being pressed against and covering an end surface of the collar located on the same side as the end surface.

16. The tool according to claim 1 , wherein the second blade cooperates in bearing engagement directly with the second face of the distal portion of the first blade.

17. The tool according to claim 16 , wherein an area of contact between the first blade and the second blade at the distal portion of the first blade is substantially in line with an area of contact between the first blade and the peripheral part of the interface.