Wear or protection system for a tool of a machine for moving earth and corresponding pin

A wear or protection system for a tool of an earth moving machine, comprising a wear element (1), a support (3) supporting said wear element (1), and a pin (7), where when said wear element (1) is mounted on said support (3) there is defined between both a housing (5) in the form of a through hole suitable for housing said pin (7), where said pin (7) has a lower surface (17) and as upper surface (19) and elastic means (13) such that the distance between the lower surface (17) and the upper surface (19) is variable depending on the value of a compressive force applied on said upper surface (19), where said housing (5) has a base surface (27) facing said lower surface (17) when said pin (7) is in said housing (5), and a compression surface (29) facing said upper surface (19) when said pin (7) is in said housing (5),

• said base surface (27) and a first portion (31) of said compression surface (29) belong to one of said wear element (1) and support (3), and the distance between said base surface (27) and said first portion (31) has a fixed value Df, whereas a second portion (33) of said compression surface (29) belongs to the other one of said wear element (1) and support (3), where the distance between said base surface (27) and said second portion (33) is variable depending on the wear of said wear element (1) and said support (3), having a minimum value Dmin when said wear element (1) and said support (3) are new and increasing as said wear element (1) and said support (3) become worn, where Dmin is less than Df,
• where said pin (7), in the compressed state, has a height H equal to said minimum value Dmin, and as said wear element (1) and said support (3) become worn, said elastic means (13) increase said height H until reaching the value Df, and
• where said pin (7) comprises a projection or a recess (23) in one of said lower or upper surfaces, and there is a recess or a projection (25), respectively, suitable for housing said projection or said recess (23) of said pin (7), in said base surface (27) or said first portion (31), respectively, so that as said elastic means (13) gradually increase said height H, the projection or recess (23) of said pin (7) goes further into the recess or projection (25) of said base surface (27) or said first portion (31) and the locking capacity that is obtained as a result of this effect gradually increases.

A pin (7) for a wear or protection system for a tool of an earth moving machine, comprising a wear element (1), a support (3) supporting said wear element (1), and said pin (7), where when said wear element (1) is mounted on said support (3) there is defined between both a housing (5) in the form of a through hole suitable for housing said pin (7), where said pin (7) has a lower surface (17) and an upper surface (19) and elastic means (13) such that the distance between the lower surface (17) and the upper surface (19) is variable depending on the value of a compressive force applied on said upper surface (19),

• a shell (9), a retainer (11) and elastic means (13), where:
• [a] said shell (9) is elongated, defining a longitudinal axis, and has a lower surface which is said lower surface (17) of the pin (7) and a longitudinal bole (35), parallel to said longitudinal axis, having a closed front end (37) and an open rear end (39), where said longitudinal hole (35) has an upper opening (15), opposite said lower surface of the shell (9), extending to the rear end (39), where said opening (15) has a width, measured in a transverse direction with respect to said longitudinal axis, less than the maximum width, measured in said transverse direction, of said hole (35),
• [b] said retainer (11) is housed in said hole (35) and has an upper surface, which is said upper surface (19) of the pin (7), and projects through said opening (15), and a lower surface (47), where said retainer (11) has an upper segment (21) with a width, measured in a transverse direction with respect to said longitudinal axis, less than the width of said opening (15) and a lower segment (45) with a width, measured in a transverse direction with respect to said longitudinal axis, greater than the width of said opening (15),
• [c] said elastic means (13) are arranged between a lower surface (41) of the hole (35) and said lower surface (47) of the retainer (11).