Connection device for detachable Backhoe

A connection device for a detachable backhoe for attaching and detaching a backhoe (2) to and from a tractor (1), the connection device comprising:

• a fixing bracket (100) mounted to the tractor (1) in such a manner that a first plate (110) and a second plate (120) are installed to face each other so that an insertion space (130) is formed between the first and second plates (110) and (120), first coupling holes (111) and (121) are formed to face each other in upper portions of the first and second plates (110) and (120), respectively, second coupling holes (112) and (122) are formed to face each other in lower portions of the first and second plates (110) and (120), respectively, an upper pin (140) is coupled to the first coupling holes (111) and (121), and a lower pin (150) is coupled to the second coupling holes (112) and (122);
• a rotating plate (200) mounted to the backhoe (2) and having a rotation recess (210) formed on a lower portion thereof inserted into the insertion space (130) so that the rotation recess (210) is fitted over the lower pin (150) to rotate about the lower pin (150), with first, second, and third hinge parts (220), (230), and (240) being formed on an upper portion of the rotating plate (200) by protruding therefrom;
• first and second locking members (300) and (400) installed on a first hinge part (220) and a second hinge part (230), respectively, so as to rotate in place toward the upper pin (140)while being elastically supported by first and second springs (310) and (410), respectively, wherein the first and second locking members (300) and (400) have first and second holding recesses (320) and (420), respectively, formed on surfaces thereof facing each other, and move over upper and lower portions of the upper pin (140), respectively, when the rotating plate (200) rotates and the upper pin (140) is fitted into the first and second holding recesses (320) and (420) so that the first and second locking members (300) and (400) are fixed by being held by the upper pin (140);
• and
• a third locking member (500) that is installed on the third hinge part (240) to rotate in place together with a handle member (510) and fixes the first and second locking members (300) and (400) so that the first and second locking members (300) and (400) are prevented from being rotated further when the first and second locking members (300) and (400) are rotated by the handle member (510)with the first and second locking members (300) and (400) fixed to the upper pin (140).