Mechanical system comprising a device for connection between a wearing part and the support thereof, heavy-construction machine bucket, and method for implementing said system

Abstract

A mechanical system includes a support, a wearing part and a device for interconnecting them. The support includes two openings on either side of a housing for receiving the device. The device includes a threaded key, a nut, and an elastic sheath having a wall adjustable by deformation. Each opening includes a first part centered on a central axis of the housing and radially extending by a maximum of 180° around the central axis, and a second part connected to the first part and radially staggered in relation to the central axis. In the insertion configuration, the device passes through the second part and does not exert any locking force on the wearing part. In the locking configuration, the axis of the key is essentially aligned with the central axis, the sheath wall is adjusted in the housing and the device exerts locking forces on the wearing part.

1 - 10 . (canceled) 
     
     
         11 . A mechanical system ( 1 ) comprising a support ( 10 ), a wearing part ( 20 ) and a connection device ( 30 ) between the wearing part ( 20 ) and its support ( 10 ), in particular between a bucket tooth ( 20 ) and its support ( 10 ) that belong to a heavy-construction machine (G), the support ( 10 ) comprising two orifices ( 16 ) emerging on either side of a housing ( 14 ) for receiving the connection device ( 30 ), the connection device ( 30 ) comprising:
 a key ( 50 ) including a body ( 53 ) that is elongated along the key axis (X50) between a threaded foot ( 52 ) and a head ( 51 ),   a nut ( 60 ) capable of being screwed on the threaded foot ( 52 ) of the key ( 50 ), and   a sheath ( 40 ) made from an elastically deformable material, arranged around the body ( 53 ), provided with a first end ( 41 ) pressed against the head ( 51 ), a second end ( 42 ) pressed against the nut ( 60 ), and a wall ( 43 ) adjustable by deformation in a housing ( 14 ) of the support ( 10 ), by screwing (R1) between the threaded foot ( 52 ) of the key ( 50 ) and the nut ( 60 ), between an insertion configuration (A) and a locked configuration (B) of the connection device ( 30 ),   wherein each through orifice ( 16 ) of the housing ( 14 ) includes:   a first part ( 17 ) centered on a central axis (X14) of the housing ( 14 ) and extending radially over more than 180° around that central axis (X14), and   a second part ( 18 ) connected to the first part ( 17 ) and radially offset relative to the central axis (X14),   
       wherein in the insertion configuration (A), the connection device ( 30 ) passes through the second part ( 18 ) of the orifices ( 16 ) and does not exert a locking force on the wearing part ( 20 ), and 
       wherein in the locked configuration (B), the key axis (X50) is substantially aligned with the central axis (X14) of the housing ( 14 ), the wall ( 43 ) of the sheath ( 40 ) is adjusted in the housing ( 14 ), and the connection device ( 30 ) exerts locking forces (F30) on the wearing part ( 20 ). 
     
     
         12 . The mechanical system ( 1 ) according to  claim 11 , wherein the central axis (X14) is transverse to a fitting direction (D1) of the wearing part ( 20 ) on the support ( 10 ). 
     
     
         13 . The mechanical system ( 1 ) according to  claim 11 , wherein the second part ( 18 ) is centered on a secondary axis (X18) offset parallel and radially relative to the central axis (X14), the secondary axis (X18) preferably being offset relative to the central axis (X14) in a direction (D2) parallel to and opposite a fitting direction (D1) of the wearing part ( 20 ) on the support ( 10 ). 
     
     
         14 . The mechanical system ( 1 ) according to  claim 11 , wherein the wearing part ( 20 ) comprises two bearing orifices ( 24 ) that, when the wearing part ( 20 ) is fitted on the support ( 10 ), are each positioned across from the second part ( 18 ) of one of the through orifices ( 16 ) of the housing ( 14 ) of the support ( 10 ), and in the locked configuration (B), the connection device ( 30 ) exerts locking forces (F30) in the bearing orifices ( 24 ). 
     
     
         15 . The mechanical system ( 1 ) according to  claim 14 , wherein each bearing orifice ( 24 ) includes a recess ( 25 ) in which either the head ( 51 ) or the nut ( 60 ) is partially housed in the locked configuration (B). 
     
     
         16 . The mechanical system ( 1 ) according to  claim 11 , wherein in the locked configuration (B), the head ( 51 ) and the nut ( 60 ) are partially framed, radially to the central axis (X14) of the housing ( 14 ), by the first parts ( 17 ) of the orifices ( 16 ). 
     
     
         17 . The mechanical system ( 1 ) according to  claim 11 , wherein a flat ( 64 ) is formed on the nut ( 60 ), said flat ( 64 ) being suitable for being housed, at least in the insertion configuration (A), in the wearing part ( 20 ). 
     
     
         18 . The mechanical system ( 1 ) according to  claim 11 , wherein the key ( 50 ) has a center of gravity situated on the key axis (X50). 
     
     
         19 . A heavy-construction machine bucket (G), comprising at least one mechanical system ( 1 ) according to  claim 11 . 
     
     
         20 . A method for implementing a mechanical system ( 1 ) according to  claim 11 , comprising the following steps:
 positioning the sheath ( 40 ) around the body ( 53 ) of the key ( 50 );   positioning the nut ( 60 ) on the threaded foot ( 52 ) of the key ( 50 );   positioning the wearing part ( 20 ) on the support ( 10 );   positioning the connection device ( 30 ) in the housing ( 14 ) of the support ( 10 ), in the insertion configuration (A) where the connection device ( 30 ) passes through the second part ( 18 ) of the orifices ( 16 ) and does not exert any locking force on the wearing part ( 20 );   deforming the sheath ( 40 ) in the housing ( 14 ) by screwing (R1) the threaded foot ( 52 ) of the key ( 50 ) into the nut ( 60 ); and   stopping the screwing (R1) in the locked configuration (B) where the axis of the key (X50) is substantially aligned with the central axis (X14) of the housing ( 14 ), the wall ( 43 ) of the sheath ( 40 ) is adjusted in the housing ( 14 ) and the connection device ( 30 ) exerts locking forces (F30) on the wearing part ( 20 ).