Patent ID: 7014385

Claim:
An attachment coupling device for connecting an attachment to an arm and a push link of heavy machinery, said attachment coupling device comprising: a pair of mounting brackets spaced apart from each other and fixedly secured to the attachment, each of the mounting brackets having first and second hooks that are aligned on an identical vertical plane; and a coupler including a pair of fixed plates secured to the arm and the push link, a pair of fixed coupling pins protruding outwardly from the fixed plates in a manner that the fixed coupling pins can be caught by the first hooks of the mounting brackets, a pair of movable coupling pins fitted to the fixed plates for linear movement between a release position and a coupling position in which the movable coupling pins come into engagement with the second hooks of the mounting brackets, and an actuator for causing the linear movement of the movable coupling pins; wherein said coupler further comprises a lock for locking the movable coupling pins at the coupling position, said lock including a rotary body rotatable about a hinge shaft between a locked position and a release position, a pair of stoppers extending from opposite sides of the rotary body to restrict movement of the movable coupling pins at the locked position, a lever adapted to cause the rotary body to rotate, and a torsion spring for resiliently urging the rotary body toward the locked position.