An assembly for releasably coupling a tool to a work machine, the tool being connected or connectable to a tool mounting body, the assembly including: a machine mounting body connected or connectable to the work machine, at least one first connector (33, 34), and at least one second connector; each of the first and second connectors being releasably engageable with the tool mounting body so that the first (33, 34) and second connectors together connect the tool mounting body in a mounted position in fixed relation to the machine mounting body; the second connector being movable relative to the machine mounting body between a release position and a lock position, wherein in the release position the second connector is configured to release the tool mounting body to allow the tool mounting body to be dismounted from the machine mounting body, and in the lock position the second connector is configured to retain the tool mounting body in the mounted position in fixed relation to the machine mounting body; wherein the second connector is reversibly movable: in a first stage of movement a crank arrangement provides that the second connector is slidably translatable with a single degree of freedom in a first direction from the release position to an engaged position, where in the release position the second connector is retracted in the carrier in the machine mounting body and in the engaged position the second connector extends from the carrier and the machine mounting body, and in a second stage of movement in a second, different direction from the engaged position to the lock position. the assembly including: a machine mounting body connected or connectable to the work machine, at least one first connector (33, 34), and at least one second connector; a machine mounting body connected or connectable to the work machine, at least one first connector (33, 34), and at least one second connector; each of the first and second connectors being releasably engageable with the tool mounting body so that the first (33, 34) and second connectors together connect the tool mounting body in a mounted position in fixed relation to the machine mounting body; the second connector being movable relative to the machine mounting body between a release position and a lock position, wherein in the release position the second connector is configured to release the tool mounting body to allow the tool mounting body to be dismounted from the machine mounting body, and in the lock position the second connector is configured to retain the tool mounting body in the mounted position in fixed relation to the machine mounting body; in the release position the second connector is configured to release the tool mounting body to allow the tool mounting body to be dismounted from the machine mounting body, and in the lock position the second connector is configured to retain the tool mounting body in the mounted position in fixed relation to the machine mounting body; wherein the second connector is reversibly movable: in a first stage of movement a crank arrangement provides that the second connector is slidably translatable with a single degree of freedom in a first direction from the release position to an engaged position, where in the release position the second connector is retracted in the carrier in the machine mounting body and in the engaged position the second connector extends from the carrier and the machine mounting body, and in a second stage of movement in a second, different direction from the engaged position to the lock position. in a first stage of movement a crank arrangement provides that the second connector is slidably translatable with a single degree of freedom in a first direction from the release position to an engaged position, where in the release position the second connector is retracted in the carrier in the machine mounting body and in the engaged position the second connector extends from the carrier and the machine mounting body, and in a second stage of movement in a second, different direction from the engaged position to the lock position.