Female part, retaining device and pin system for excavators and the like

1. A female part ( 10 ) for excavators, comprising a body with a cavity ( 11 ) comprising a bottom end ( 112 ), an open end, and walls ( 110 , 111 , 113 ), wherein at least one of said walls ( 110 ) is a side wall that has a first hole ( 12 ) that goes through the side wall and wherein said side wall ( 110 ) with the first hole ( 12 ) comprises a second hole ( 13 ) with a retention structure for attaching a retention device, the second hole is placed between the bottom end ( 112 ) of the cavity ( 11 ) and the first hole ( 12 ) and is separated from said first hole ( 12 ).

2. The female part, according to claim 1 , wherein the first hole ( 12 ) and the second hole ( 13 ) are located in a lowered surface ( 14 ) of the side wall ( 110 ), the lowered surface formed on an inside of the cavity ( 11 ).

3. The female part, according to claim 1 , comprising a groove ( 15 ) inside the cavity ( 11 ) placed in the side wall 110 between the open end of the cavity ( 11 ) and the first hole ( 12 ).

4. The female part, according to claim 1 , wherein a center of the first hole and a center of the second hole are placed on an axis that symmetrically divides the side wall.

5. The female part, according to claim 1 , wherein the second hole is T-shaped, with a first portion ( 131 ) of the T extending to the first hole of the female part and a second portion ( 132 ) of the T perpendicular to said first portion, the second hole further defining an intermediate surface ( 133 ) on each side of the first portion extending towards the first hole and between an inside surface and an exterior surface of the side wall ( 110 ).

6. The female part, according to claim 3 , wherein the first and second holes are placed within a lowered surface in the side wall inside the cavity and wherein the groove ( 15 ) comprises a slot within the side wall ( 110 ), the groove having a larger depth than a depth of the lowered surface ( 14 ).

7. The female part, according to claim 1 , comprising a retaining device ( 3 , 6 ) with one elongated element ( 30 , 60 ) determining a bent body with two arms ( 31 , 61 ) that extend from a first bent end ( 33 , 63 ) to a second end ( 39 , 69 ) opposite to the first bent end ( 33 , 63 ) and where each of the two arms has a free end ( 36 , 62 ) and wherein the retaining device comprises attaching means ( 36 , 64 ) on the second end ( 39 , 69 ) for coupling the retaining device ( 3 , 6 ) inside the cavity ( 11 ) of the female part ( 10 ).

8. The female part, according to claim 7 , wherein the attaching means ( 36 ) are determined by hook-shaped ends ( 38 ) shaped to engage surfaces of the second hole facing an outside of the cavity.

9. The female part, according to claim 8 , wherein the hook-shaped ends when engaged with the second hole are supported on respective intermediate surfaces ( 133 ) within the second hole ( 13 ) that extend toward the first hole and wherein the hook-shaped ends have an in intermediate portion extending through the second hole and having a length corresponding to a depth of the second hole defined by the inside surface of the wall 110 and the intermediate surfaces 133 .

10. The female part, according to claim 8 , wherein near the first bent end ( 33 ) of the device ( 3 ) each of the arms ( 31 ) has:

a first curve (c 1 ) towards the hook-shaped ends followed by a first arm section ( 32 ),

a second curve (c 2 ) after the first section ( 32 ), that is contrary to the first curve (c 1 ), and that is followed by a second arm section ( 35 ), and

a third curve (c 3 ) that determines the first bent end ( 33 ),

wherein each arm is substantially parallel to the other arm.

11. The female part, according to claim 8 , wherein the attaching means ( 64 , 65 ) comprise two components ( 64 , 65 ) detachable one from the other, wherein one of the components ( 64 ) is attached to the free ends ( 62 ) of the device ( 6 ) maintaining said free ends together.

12. The female part, according to claim 11 , wherein the two components ( 64 , 65 ) are threaded so as to be removably coupled to each other.

13. The female part, according to claim 8 , wherein the second end ( 39 , 69 ) of the retaining device ( 3 , 6 ) is attached to the second hole ( 12 ), and wherein a distance the two arms ( 31 , 61 ) of the retaining device ( 3 , 6 ) is smaller than a diameter of the first hole ( 12 ) of the female part ( 10 ).

14. The female part, according to claim 8 , wherein the first bent end of the retaining device is placed within a groove of the female part.

15. The female part, according to claim 14 , wherein the arms of the retaining device are substantially parallel when the retaining device is attached to the second hole.

16. The female part, according to claim 1 , wherein the second hole ( 13 ) is a through hole crossing the wall of the female element ( 10 ) containing the second hole.

17. The female part, according to claim 1 , wherein the second hole ( 230 ) is a blind hole.

18. A pin system for coupling a male part ( 20 ) and a female part ( 10 ) of excavators comprising:

a duct ( 22 ) in the male part ( 20 ),

a female part ( 10 ) according to claim 1 , and

a pin ( 40 ), crossing the first hole ( 12 ) on the wall ( 110 ) of the female part ( 10 ), and crossing the duct ( 22 ) of the male part ( 20 ).

19. A pin system for coupling a male part ( 20 ) and a female part ( 10 ) of excavators comprising:

a duct ( 22 ) in the male part ( 20 ),

a female part ( 10 ) according to claim 1 ,

a retaining device ( 3 , 6 ) having two arms, and

a pin ( 40 ), crossing the first hole ( 12 ) on the wall ( 110 ) of the female part ( 10 ), passing between the two arms ( 31 , 61 ) of the retaining device ( 3 , 6 ) and crossing the duct ( 22 ) of a male part ( 20 ), said pin comprising at least one slot ( 41 ) on a surface of the pin to receive one of the arms ( 31 , 61 ) of the retaining device ( 3 , 6 ).