Quick-release fastener device formed of two connection parts, for attaching a tool to the end of the arm of a machine

Abstract

Quick-release fastener including a first connection part for attaching to a tool and a second connection part for attaching to an arm of a machine, the first part including a base plate with a front and rear edge, a coupling pin or hook protruding from the lower face of, and a locking hook protruding from the upper face of, the base plate. The second part includes a hook or pin to couple to the coupling pin or hook of the first part, and a slidably mounted locking plate, the locking hook of the first part passing through a through-opening formed in the slidable locking plate of the second part to hook to an edge of the opening once the locking plate has slid to lock the quick-release fastener device. The front edge of the base plate of the first part defines a notch, in particular in a flared shape.

1 . A quick-release fastener device for attaching a tool such as a bucket to the end of the arm of a machine such as a hydraulic shovel or the like, comprising a first connection part ( 1 ) intended to be attached to the bucket and a second connection part ( 2 ) intended to be attached to the arm, the first part ( 1 ) comprising a base plate ( 3 ) having a front edge ( 11 ) and a rear edge ( 10 ), a coupling hook ( 4 ,  5 ) or pin protruding from the lower face of the base plate ( 3 ) on the rear side, and a locking hook ( 6 ) protruding from the upper face of the base plate ( 3 ), the second part ( 2 ) comprising a pin ( 9 ) or hook intended to be coupled to the coupling hook ( 4 ,  5 ) or pin, as the case may be, of the first part ( 1 ), and a slidably mounted locking plate ( 32 ) biased by spring means, the locking hook ( 6 ) of the first part ( 1 ) being intended to pass through a through-opening formed in the slidable locking plate ( 32 ) of the second part ( 2 ) in order to be hooked to an edge of the opening once the locking plate ( 32 ) has slid in order to ensure the locking of the quick-release fastener device, characterised in that the front edge ( 11 ) of the base plate ( 3 ) of the first part ( 1 ) defines a notch ( 15 ), in particular in a flared shape. 
     
     
         2 . The device according to  claim 1 , characterised in that the locking hook ( 6 ) has a shank part ( 7 ) and a head part ( 8 ) which projects laterally from the shank part ( 7 ) in the forward direction, and the notch ( 15 ) extends so far as to be vertically in line with the head part ( 8 ) of the locking hook ( 6 ), in particular as far as the shank part ( 7 ). 
     
     
         3 . The device according to  claim 1 , characterised in that the first connection part ( 1 ) comprises at least one rear tab ( 4 ,  5 ), in particular two rear tabs ( 4 ,  5 ), one left and one right, in the form of coupling hooks intended to be coupled to a pin ( 9 ) of the second connection part ( 2 ). 
     
     
         4 . The device according to  claim 1 , characterised in that the front edge ( 11 ) is notched in that it comprises a central portion ( 12 ) and two portions, one right ( 13 ) and one left ( 14 ), which are tilted with respect to the central portion ( 12 ), in particular by an angle of between 30° and 60°, in particular of 45°, so as to form the notch ( 15 ). 
     
     
         5 . The device according to  claim 1 , characterised in that the front edge defines two front prominences ( 16 ,  17 ), one left and one right, on either side of the notch when viewed in a longitudinal section from back to front, each prominence comprising an upper end portion that is curved, in particular in the form of a circular arc, having its concavity facing downwards. 
     
     
         6 . The device according to  claim 5 , characterised in that the two prominences, one left and one right, end in two protuberances, one right and one left, respectively. 
     
     
         7 . The device according to  claim 6 , characterised in that, when viewed in a longitudinal section from back to front, each protuberance comprises, starting from the lower surface of the base plate ( 3 ), a curved upper end portion ( 18 ) having its concavity facing downwards, which is preceded by an intermediate curved portion ( 19 ) having its concavity facing upwards, which in turn is preceded by a rectilinear portion ( 20 ) that is vertical or substantially vertical, for example forming an angle of 5° to 10° with the vertical, and extends up to the upper face of the base plate ( 3 ). 
     
     
         8 . The device according to  claim 1 , characterised in that, in the upper surface of the base plate ( 3 ) of the first part, left-hand and right-hand side shoulders ( 21 ) are formed which define respective left-hand and right-hand flow channels which extend between the rear edge ( 11 ) and the front edge ( 10 ) and through which water and/or soil and/or other waste products can flow. 
     
     
         9 . The device according to  claim 7 , characterised in that, when viewed from above, inner side walls of the shoulders each comprise a rear portion ( 25 ), an intermediate portion ( 26 ) and a front portion ( 27 ), front ends of the intermediate portions being closer to the longitudinal central axis of the base plate ( 3 ) than the rear ends are. 
     
     
         10 . The device according to  claim 8 , characterised in that upper surfaces of the shoulders ( 21 ) are sloped downwards from the outside inwards. 
     
     
         11 . The device according to  claim 1 , characterised in that at a front end of the second connection part ( 2 ), two abutments ( 52 ,  53 ), one left and one right, project from the lower face of the base plate ( 30 ). 
     
     
         12 . The device according to  claim 11 , characterised in that the front edge defines two front prominences ( 16 ,  17 ), one left and one right, on either side of the notch when viewed in a longitudinal section from back to front, each prominence comprising an upper end portion that is curved, in particular in the form of a circular arc, having its concavity facing downwards,
 further characterised in that upper surfaces of the shoulders ( 21 ) are sloped downwards from the outside inwards,   further characterised in that, in the upper surface of the base plate ( 3 ) of the first part, left-hand and right-hand side shoulders ( 21 ) are formed which define respective left-hand and right-hand flow channels which extend between the rear edge ( 11 ) and the front edge ( 10 ) and through which water and/or soil and/or other waste products can flow, and   further characterised in that there is formed in each abutment ( 52 ,  53 ) a respective region ( 50 ,  51 ) having a surface whose shape is complementary to the upper end surface of the prominences ( 16 ,  17 ) of the first part ( 1 ) such that said prominences ( 16 ,  17 ) are in surface contact with said regions ( 50 ,  51 ) when the device is in the locking position.   
     
     
         13 . The device according to  claim 1 , characterised in that two protrusions ( 40 ), one left and one right, project from the lower face of the base plate ( 30 ) of the second part in the region of the rear edge. 
     
     
         14 . The device according to  claim 13 , characterised in that each protrusion ( 40 ) comprises a central, concave region, the concavity of which faces downwards and is of a complementary shape to the upper, convex face ( 42 ) of the two hook-shaped tabs ( 4 ,  5 ), one left and one right, of the first part ( 1 ) such that the two protrusions ( 40 ) come into surface contact with the two hook-shaped tabs ( 4 ,  5 ) when the device is in the locking position. 
     
     
         15 . A first connection part ( 1 ) intended to be part of a quick-release fastener device for attaching a tool such as a bucket to the end of the arm of a machine such as a hydraulic shovel or the like, said device comprising the first connection part ( 1 ) intended to be attached to the bucket and a second connection part ( 2 ) intended to be attached to the arm, the first part ( 1 ) comprising a base plate ( 3 ) having a front edge ( 11 ) and a rear edge ( 10 ), a coupling hook ( 4 ,  5 ) or pin protruding from the lower face of the base plate ( 3 ), and a locking hook ( 6 ) protruding from the upper face of the base plate ( 3 ), the second part ( 2 ) comprising a pin ( 9 ) or hook intended to be coupled to the coupling hook ( 4 ,  5 ) or pin, as the case may be, of the first part ( 1 ), and a slidably mounted locking plate ( 32 ) biased by spring means, the locking hook ( 6 ) of the first part ( 1 ) being intended to pass through a through-opening formed in the slidable locking plate ( 32 ) of the second part ( 2 ) in order to be hooked to an edge of the opening once the locking plate ( 32 ) has slid in order to ensure the locking of the quick-release fastener device, characterised in that the front edge ( 11 ) of the base plate ( 3 ) of the first part ( 1 ) defines a notch ( 15 ), in particular in a flared shape.