Device for cutting, mobile working machine, method and gripping member

A cutting device (1) of a mobile working machine, for cutting elongated objects (2), in particular piles (2), and for being connected to a mobile working machine, comprising

• a first gripping member (101) and a second gripping member (102), which gripping members (101,102) are pivotal around the same pivot axis (X), said gripping members (101,102) having gripping faces (101a,102a) delimiting from opposite sides a gripping gap (G) as viewed in direction of said pivot axis (X), the gripping members (101,102) being movable towards each other by pivoting around said pivot axis (X) for gripping by their gripping faces (101a,102a) an elongated object (2) placed in the gripping gap (G) from opposite sides, and away from each other for releasing the elongated object (2) from the grip;
• and
• moving means (103) actuatable to move the gripping members (101,102) towards and away from each other;
• and
• cutting means (104) including a cutting unit (1040) for cutting an elongated object (2) placed in the gripping gap (G);
• wherein the gripping face (101a,102a) of each gripping member (101,102) is shaped to have a gripping recess (R) for receiving a side of the elongated object (2) placed in the gripping gap (G), the gripping recess (R) comprising:
• a bottom point (C0) via which a circle (Y1) passes, which circle (Y1) has said pivot axis (X) as centre;
• and
• a first flank portion (Pa) having a profile curved towards the bottom point (C0) from the outer side of the circle (Y1);
• and
• a second flank portion (Pb) having a profile curved towards the bottom point (C0) from the inner side of the circle (Y1),
• wherein
• the profile of each of said first and second flank portion (Pa,Pb) as viewed in direction of said pivot axis (X) follows a curve approaching the circle (Y1) which has pivot axis (X) as centre from the outer and inner side of the circle (Y1), respectively;
• and
• each said curve is defined by plurality of successive points (A1-A4;
• B1-B4), wherein the end point (I1-I4) of a normal vector (nA1-nA4) of each point (A1-A4) of the first flank portion (Pa) is an end point of a same length normal vector (nB1-nB4) of a point (B1-B4) of the second flank portion (Pb), the end points (I1-I4) of all said normal vectors (nA1-nA4, nA1-nA4) being points of said circle (Y1) and thereby at same distance (D) from the pivot axis (X).