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A reversible locking device 1 for a tensioner 100 of a timing chain 20 includes a locking device body 3, integral with the tensioner 100 and protruding with respect to the body of the tensioner 100, which has a shaped slot 2. A perforated protrusion 4 is integral with the shoe 5 carried by the pisto

A reversible locking device 1 for a tensioner 100 of a timing chain 20 includes a locking device body 3, integral with the tensioner 100 and protruding with respect to the body of the tensioner 100, which has a shaped slot 2. A perforated protrusion 4 is integral with the shoe 5 carried by the piston 6 and protrudes with respect to the shoe 5 so that its hole is aligned with the shaped slot. A rod 7 has a first part 8 with a shape complementary to that of the shaped slot 2 and a second part 9 bearing at one end a conical portion 10 adapted to couple it irreversibly to the perforated protrusion 4 integral with the shoe 5.

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What is claimed is: 1. A reversible locking device (1) for a tensioner (100) including a tensioner body, a shoe (5), and a tensioner piston (6), the reversible locking device comprising: a locking device body (3) having a shaped slot (2), wherein the locking device body (3) is integral with the ten

What is claimed is: 1. A reversible locking device (1) for a tensioner (100) including a tensioner body, a shoe (5), and a tensioner piston (6), the reversible locking device comprising: a locking device body (3) having a shaped slot (2), wherein the locking device body (3) is integral with the tensioner (100) and protrudes with respect to the tensioner body; a perforated protrusion (4) defining a hole, formed integrally with the shoe (5) carried by the tensioner piston (6) and protruding with respect to the shoe (5) such that the hole of the perforated protrusion is aligned with the shaped slot (2) of the locking device body; and a rod (7) having a first part (8) with a shape complementary to that of the shaped slot (2) and a second part (9) with a first end coupled with the perforated protrusion (4); wherein the locking device is reversibly lockable; and wherein the locking device is retained on the tensioner when the tensioner is locked by the locking device and when the locking device is disabled, wherein the rod extends through the shaped slot of the locking device body and through the hole of the perforated protrusion when the tensioner is locked by the locking device and when the locking device is disabled. 2. The reversible locking device of claim 1, wherein the rod (7) is made of a plastic material. 3. The reversible locking device of claim 1, wherein the perforated protrusion (4) is made of a plastic material that is the same as a plastic material used to make or to coat the shoe (5). 4. The reversible locking device of claim 1, wherein the locking device body (3) is made in one piece with the tensioner body. 5. The reversible locking device of claim 1, wherein the locking device body (3) is made of a plastic material and applied to the tensioner (100). 6. The reversible locking device of claim 1, wherein the second part (9) of the rod (7) includes a conical portion (10). 7. The reversible locking device of claim 6, wherein a joining surface (12) between the first part (8) and the second part of the rod (7) contacts the locking device body (3) and the conical portion contacts the perforated protrusion to limit a stroke of the piston when the tensioner (100) is locked. 8. The reversible locking device of claim 6, wherein the first part (8) of the rod (7) comprises a pair of protrusions (11). 9. The reversible locking device of claim 8, wherein the protrusions are diametrically opposed and of a greater length than a major axis of the shaped slot (2), and a stroke of the first part (8) of the rod in the shaped slot (2) when the reversible locking device is disabled is limited by the protrusions (11) and the conical portion and is greater than a stroke of the piston (6) when the chain (20) is slack. 10. The reversible locking device of claim 8, wherein a stroke of the piston (6) is limited by the protrusions (11) resting on the locking device body (3) and by the conical portion (10) contacting the perforated protrusion (4) when the locking device is disabled. 11. The reversible locking device of claim 1, wherein the locking device is disabled by rotating the rod (7) and allowing the second part (9) of the rod (7) to pass through the shaped slot (2). 12. The reversible locking device of claim 1, wherein the locking device (1) is formed such that exerting traction on the end of the first part (8) of the rod (7) such that the first part (8) leaves the shaped slot (2) and rotating the rod (7) such that a joining surface (12) of the rod (7) rests against the body (3) locks the locking device. 13. A reversible locking device (1) for a tensioner (100) including a tensioner body, a shoe (5), and a tensioner piston (6), the reversible locking device comprising: a locking device body (3) having a shaped slot, wherein the locking device body is integral with the shoe (5) carried by the tensioner piston (6) and protrudes with respect to the shoe (5); a perforated protrusion (4) defining a hole, formed integrally with the tensioner body and protruding with respect to the tensioner body such that the hole of the perforated protrusion is aligned with the shaped slot (2) of the locking device body; a rod (7) having a first part (8) with a shape complementary to that of the shaped slot (2) and a second part (9) with a first end coupled with the perforated protrusion (4); wherein the locking device is reversibly lockable; and wherein the locking device is retained on the tensioner when the tensioner is locked by the locking device and when the locking device is disabled, wherein the rod extends through the shaped slot of the locking device body and through the hole of the perforated protrusion when the tensioner is locked by the locking device and when the locking device is disabled. 14. The reversible locking device of claim 13, wherein the tensioner is used in a timing chain. 15. The reversible locking device of claim 13, wherein the rod (7) is made of a plastic material and the locking device body (3) is made of the plastic material used to make or to coat the shoe (5). 16. The reversible locking device of claim 13, wherein the second part (9) of the rod (7) includes a conical portion (10). 17. The reversible locking device of claim 16, wherein a joining surface (12) between the first part (8) and the second part of the rod (7) contacts the locking device body (3) and the conical portion contacts the perforated protrusion to limit a stroke of the piston when the tensioner (100) is locked. 18. The reversible locking device of claim 16, wherein the first part (8) of the rod (7) comprises a pair of protrusions (11). 19. The reversible locking device of claim 18, wherein the protrusions are diametrically opposed and of a greater length than a major axis of the shaped slot (2), and a stroke of the first part (8) of the rod in the shaped slot (2) when the reversible locking device is disabled is limited by the protrusions (11) and the conical portion and is greater than a stroke of the piston (6) when the chain (20) is slack. 20. The reversible locking device of claim 18, wherein a stroke of the piston (6) is limited by the protrusions (11) resting on the locking device body (3) and by the conical portion (10) contacting the perforated protrusion (4) when the locking device is disabled. 21. The reversible locking device of claim 13, wherein the locking device is disabled by rotating the rod (7) and allowing the second part (9) of the rod (7) to pass through the shaped slot (2). 22. The reversible locking device of claim 13, wherein the locking device (1) is formed such that exerting traction on the end of the first part (8) of the rod (7) such that the first part (8) leaves the shaped slot (2) and rotating the rod (7) such that a joining surface (12) of the rod (7) rests against the body (3) locks the locking device.