Work device

A work device, comprising:

• a body comprising an attachment arrangement for arranging the work device at an end of a set of booms of a work machine;
• a pair of jaws fitted to the body and arranged to form a grab, of which one of the jaws of the pair of jaws is a fixed jaw fitted permanently and immovably fixed to the body and the other of the jaws of the pair of jaws is a rotatable jaw arranged separately from the attachment arrangement;
• and pivoted rotatably to the body to open and close the grab, the rotatable jaw comprising a base part at one end thereof, the base part comprising a rotation pivot;
• claws fitted to each of the fixed and rotatable jaws in which the claws of the rotatable jaw are arranged to intermesh with the claws of the fixed jaw for bringing the rotatable jaw out of way of the fixed jaw;
• a hydraulic actuator having one end attached to the body of the work device and comprising a linearly moveable operating element arranged to act on the rotatable jaw to open and close the grab;
• and
• a wide-angle pivot setup arranged to the work device between the moveable operating element of the hydraulic actuator and the rotatable jaw to open and close the grab by using only the rotatable jaw, wherein the wide-angle pivot setup comprises an arm mechanism that includes:
• a jaw arm having two pivots fitted on the jaw arm, wherein one of the two pivots is connected to the movable operating element of the hydraulic actuator, and the other of the two pivots are connected to the base part comprising the rotation pivot of the rotatable jaw;
• and
• a rotatable lever arm arranged between the jaw arm and a first pivoting in the body;
• wherein the arm mechanism is arranged to rotate the moveable jaw by converting the linear movement of the movable operating element of the hydraulic actuator into a rotational movement of the rotatable jaw;
• wherein a rotation angle of the movement of the rotatable jaw by the wide-angle pivot setup has a magnitude of more than 120°;
• and
• wherein the other of the two pivots in the jaw arm of the arm mechanism is further from the moveable operating element of the hydraulic actuator than the one pivot, and, in a closed extreme position of the rotatable jaw, is arranged by the wide-angle pivot setup behind the rotation pivot of the rotatable jaw, relative to the moveable operating element of the hydraulic actuator.

A work device, comprising:

• a body comprising an attachment arrangement for arranging the work device at an end of a set of booms of a work machine;
• a pair of jaws fitted to the body and arranged to form a grab, of which one of the jaws of the pair of jaws is a fixed jaw fitted permanently and immovably fixed to the body and the other of the jaws of the pair of jaws is a rotatable jaw arranged separately from the attachment arrangement and pivoted rotatably to the body to open and close the grab, the rotatable jaw comprising a base part at one end thereof, the base part comprising a rotation pivot;
• claws fitted to each of the fixed and rotatable jaws in which the claws of the rotatable jaw are arranged to intermesh with the claws of the fixed jaw for bringing the rotatable jaw out of way of the fixed jaw;
• a hydraulic actuator having one end attached to the body of the work device and comprising a linearly moveable operating element arranged to act on the rotatable jaw to open and close the grab;
• and
• a wide-angle pivot setup arranged to the work device between the moveable operating element of the hydraulic actuator and the rotatable jaw to open and close the grab by using only the rotatable jaw, wherein the wide-angle pivot setup comprises an arm mechanism that includes:
• a jaw arm having two pivots fitted on the jaw arm, wherein one of the two pivots is connected to the movable operating element of the hydraulic actuator, and the other of the two pivots are connected to the base part comprising the rotation pivot of the rotatable jaw;
• and
• a rotatable lever arm arranged between the jaw arm and a first pivoting in the body, wherein the rotatable lever arm comprises a second pivoting fitted to the moveable operating element of the hydraulic actuator;
• and
• wherein the arm mechanism is arranged to rotate the moveable jaw by converting the linear movement of the movable operating element of the hydraulic actuator into a rotational movement of the rotatable jaw;
• wherein a rotation angle of the movement of the rotatable jaw by the wide-angle pivot setup has a magnitude of more than 120°.