Clamping collar with retaining fingers

1. A clamping system for connecting a first and a second tube whose opposite ends have clamping surfaces protruding from a cylindrical outer surface of said tubes, the clamping system comprising a collar which comprises a belt able to be clamped around said clamping surfaces, the belt having a first and a second flank between which an internal recess able to receive the clamping surfaces is delimited, the collar carrying at least one retaining finger, which has a free end portion protruding axially beyond an edge of the first flank, said free end portion having a retaining edge configured to be retained outside the belt by a radially protruding element, wherein the clamping system comprises centering surfaces located axially outside the edge of the first flank.

2. The clamping system according to claim 1 , wherein the centering surfaces comprise at least one centering surface formed on the retaining finger.

3. The clamping system according to claim 1 , wherein the collar carries at least one centering finger protruding axially beyond the edge of the first flank and wherein the centering surfaces comprise at least one centering surface formed on the centering finger.

4. The clamping system according to claim 3 , wherein the centering finger has a ramp at an end of a free end portion thereof.

5. The clamping system according to claim 3 , wherein the centering finger has at least one reinforcing rib.

6. The clamping system according to claim 3 , comprising a washer supported by the collar, the washer comprising an annular part disposed inside the belt and carrying the retaining finger and at least one centering finger protruding axially beyond the edge of the first flank and wherein the centering surfaces comprise at least one centering surface formed on the centering finger.

7. The clamping system according to claim 1 , wherein the retaining finger has a ramp at an end of the free end portion thereof.

8. The clamping system according to claim 1 , wherein the retaining finger has at least one reinforcing rib.

9. The clamping system according to claim 1 , comprising a washer supported by the collar, the washer comprising an annular part disposed inside the belt and carrying the retaining finger.

10. The clamping system according to claim 1 , wherein the retaining edge is formed on a pin cut out in the retaining finger and deformed radially.

11. An assembly comprising a clamping system and a first tube, the first tube presenting a clamping surface arranged in a vicinity of a free end thereof and protruding from a cylindrical outer surface of the first tube, and the first tube further having a retaining protrusion located on the other side of the clamping surface relative to the free end, the clamping system comprising a collar which comprises a belt able to be clamped around the clamping surface, the belt having a first and a second flank between which an internal recess able to receive the clamping surface is delimited, the collar carrying at least one retaining finger, which has a free end portion protruding axially beyond an edge of the first flank, said free end portion having a retaining edge configured to be retained outside the belt by the retaining protrusion in a condition in which the first tube is fitted into the collar, wherein the retaining protrusion is formed on a transverse blade which has a fastening portion through which it is fastened to the first tube, and two retaining portions straightened radially relative to the fastening portion, and wherein the collar carries two retaining fingers configured to cooperate with said retaining portions.

12. The assembly according to claim 11 , wherein the retaining protrusion is configured to define an angular wedging of the clamping system relative to the first tube.

13. The assembly according to claim 12 , wherein the transverse blade has two shoulders forming a radial stop for the retaining fingers carried by the collar and configured to cooperate with said retaining portions.

14. A clamping system for connecting a first and a second tube whose opposite ends have clamping surfaces protruding from a cylindrical outer surface of said tubes, the clamping system comprising a collar which comprises a belt able to be clamped around said clamping surfaces, the belt having a first and a second flank between which an internal recess able to receive the clamping surfaces is delimited, the collar carrying at least one retaining finger, which has a free end portion protruding axially beyond an edge of the first flank, said free end portion having a retaining edge configured to be retained outside the belt by a radially protruding element, the retaining edge being formed on a pin cut out in the retaining finger and deformed radially.

15. An assembly comprising a clamping system and a first tube, the first tube presenting a clamping surface arranged in a vicinity of a free end thereof and protruding from a cylindrical outer surface of the first tube, and the first tube further having a retaining protrusion located on the other side of the clamping surface relative to the free end, the clamping system comprising a collar which comprises a belt able to be clamped around the clamping surface, the belt having a first and a second flank between which an internal recess able to receive the clamping surface is delimited, the collar carrying at least two retaining fingers, which have free end portions protruding axially beyond an edge of the first flank, the retaining protrusion having two shoulders forming respective radial stops for the retaining fingers collar and configured to cooperate with respective retaining edges formed on the free end portions of the retaining fingers in a condition in which the first tube is fitted into the collar.