ROTARY FORK DEVICE

PURPOSE: To improve the working efficiency by mounting a hydraulic motor on the lower bearing of a frame body fitted to the forward end of a work attachment and rotating a grapple about an axial center work the driving force of the motor. CONSTITUTION: Regarding a hydraulic shovel equipped with a fork device 7, a frame 15 formed out of an upper base frame 16 and a lower bearing 17 integrated with each other is fitted to the arm forward end of a work attachment and a front bracket 17 is jointed to the arm forward end with a pin. In addition, a hydraulic motor 21 is laid on the rear side of the frame 17 and the external joint of a swivel joint 22 is fitted to the front side thereof. A main shaft is inserted in the bearing 17 and connected to the motor 21. A long-sized cylinder 23 housing a fork cylinder 29 is jointed to the internal joint of the swivel joint 22. Furthermore, a frame body 24 is fixed to the cylinder 23 and a slide body 25 slidable on the operation of the fork cylinder 29 is provided therein. In this case, a pair of teeth 27 and 28 are opened and closed on the operation of the cylinder 29.