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A device for adjusting the release position of an operation element of a brake includes an articulated rod hinged and rotationally connected to the operation element. The articulated rod has an adjustment end provided with a pin having a threaded adjustment hole at least partly threaded and engaged

A device for adjusting the release position of an operation element of a brake includes an articulated rod hinged and rotationally connected to the operation element. The articulated rod has an adjustment end provided with a pin having a threaded adjustment hole at least partly threaded and engaged with a threaded portion of a push rod, operatively connected to the operation element of the brake. The device comprises an anti-rotation device for preventing rotation of the push rod.

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1. Adjustment device for maintaining a standby or release position of an operation element of a brake of a vehicle, the operation element being hinged on a fulcrum so as to rotate thereon about a hinge axis,the device comprising an articulated rod hinged on said fulcrum at a hinging end, the articul

1. Adjustment device for maintaining a standby or release position of an operation element of a brake of a vehicle, the operation element being hinged on a fulcrum so as to rotate thereon about a hinge axis,the device comprising an articulated rod hinged on said fulcrum at a hinging end, the articulated rod being connected in rotation to the operation element,the articulated rod comprising an adjustment end, opposite the hinging end, provided with a pin having at least one adjustment hole at least partly threaded,the device comprising a push rod, operatively connected to operation means of the brake,the push rod having a threaded portion at least partly screwed into said adjustment hole of said articulated rod so as to mechanically connect said articulated rod and the operation element to the operation means of the brake, the screwing position between the push rod and the articulated rod being variable so as to change the angular released position of the operation element relative to the hinge axis,the device comprising anti-rotation means, suitable for locking the push rod against rotation, whereinsaid push rod comprises an operating portion suitable for rotating the push rod relative to an adjustment axis,said operating portion is arranged at a free end of the push rod, opposite a connection end of the push rod to the operation means and comprises a hexagonal section suitable for being rotated by a counter shaped wrench,wherein the anti-rotation means comprise a spring having a tab provided with a locking hole having a complementary section relative to said operating portion of the push rod so as to make the spring integral in rotation with the push rod. 2. Device according to claim 1, wherein the adjustment hole is directed along said adjustment axis substantially perpendicular to the hinge axis. 3. Device according to claim 1, wherein said push rod extends along said adjustment axis perpendicular to said hinge axis. 4. Device according to claim 1, wherein the push rod comprises at least one turning portion relative to the adjustment axis so as to rotate inside the adjustment hole and change the angular position of the articulated rod and of the operation element relative to the hinge axis. 5. Device according to claim 1, wherein said push rod is turnably connected to the operation means, so as to rotate about the adjustment axis while keeping the mechanical connection with the operation means. 6. Device according to claim 1, wherein the push rod comprises a spherical articulation coupling with the operation means, suitable for allowing a relative inclination between the push rod and the operation means and a relative rotation of the push rod relative to the operation means along said adjustment axis. 7. Device according to claim 1, wherein the locking hole and the operating portion have hexagonal section. 8. Device according to claim 1, wherein the spring comprises a body connected to the tab and suitable for obtaining a lock in rotation of the spring and of the push rod relative to the adjustment axis. 9. Device according to claim 8, wherein the body is arranged at least partly about the push rod so as to interfere in rotation, relative to the adjustment axis, with the articulated rod, performing the anti-rotation function. 10. Device according to claim 8, wherein the body comprises a reaction rod, connected to said tab, and an arc portion suitable for imparting elasticity to the spring relative to a direction parallel to the adjustment axis. 11. Device according to claim 10, wherein said arc portion comprises a stopping plate, arranged astride of the push rod, between the operation portion of the push rod and the threaded portion so as to prevent extraction of the spring from the push rod along said adjustment axis. 12. Device according to claim 11, wherein the stopping plate comprises a first passage hole provided with an opening, suitable for allowing passage of the operating portion of the push rod, and with a slit suitable for axially constraining the spring between the threaded portion and the connection end. 13. Device according to claim 12, wherein the push rod comprises a groove arranged between the threaded portion and the operating portion, said slit being suitable for associating to the groove. 14. Device according to claim 12, wherein said arc portion comprises a second passage hole suitable for allowing passage of the threaded portion. 15. Device according to claim 1, further comprising a stop suitable for preventing rotation of the spring relative to the adjustment axis. 16. Device according to claim 15, wherein said stop is obtained by a fork portion, at the adjustment end of the articulated rod, suitable for embracing the body and preventing the rotation thereof relative to the adjustment axis. 17. Device according to claim 1, wherein said operation element is a brake pedal. 18. Brake for a vehicle, comprising a device according to claim 1. 19. Brake for vehicle according to claim 18, wherein said operation means comprise stopping means suitable for fixing the release position of the connection end of the push rod with the operation means. 20. Brake for vehicle according to claim 19, wherein said stopping means comprise a washer suitable for receiving in abutment and stopping said connection end of the push rod in a release condition so as to define the release position of the operation element. 21. Brake for vehicle according to claim 18, wherein said operation means are of a hydraulic type. 22. Brake for vehicle according to claim 18, wherein said brake is a disc brake or a drum brake.