Coupling device for mounting a material handling machine on a civil engineering vehicle

A coupling device for mounting a material handling machine on a civil engineering vehicle comprising:

• a first bracket assembly secured to said vehicle and including a pair of brackets, each having a base plate member and a coupling plate member which protrudes at a right angle to said base plate member, each of said coupling plate members having an upper pin-receiving concave seat with an upwardly opening locking first slot of a first predetermined width continuous therewith, and a lower pin-receiving concave seat with an upwardly opening second slot of a second predetermined width continuous therewith, said second width being relatively greater than said first width, and said coupling plate members being spaced apart in a horizontal direction;
• a second bracket assembly secured to said material handling machine, said bracket assembly including a base plate member and pair of coupling means which protrude at a right angle from the base plate member, said coupling means each being bifurcated into two parts of coupling plate members which are disposed in horizontally spaced relation to each other, said coupling plate members each having upper and lower pin-attaching holes positioned in corresponding relation to said upper and lower pin-receiving concave seats, respectively, of said first bracket assembly;
• a pair of upper pins having recessed surface means formed thereon, thereby providing the pins with middle portions having reduced widths which are slightly smaller than the predetermined width of said locking slots, said upper pins being formed with handles and being adapted to be inserted through said upper pin-attaching holes in said coupling plate members of said second bracket assembly;
• and
• lower pins having circular cross sections throughout the entire lengths thereof and adapted to be inserted into said lower pin-attaching holes in said coupling plate members of said second bracket assembly.