Tractor installed rotatable arm

Abstract

The present invention provides a tractor with a rotatable articulated arm in which a rotating shaft is installed around a driver cab of the tractor, and the articulated arm is coupled to the rotating shaft so that the articulated arm can rotate around the rotating shaft within as large an angular range as possible, whereby an operating radius and working efficiency of an operating implement mounted to an end of the articulated arm can be markedly improved. In the present invention, the driver cab which is provided with a driver seat is disposed on a body frame at a position displaced to one side from a central portion of the body frame. The rotating shaft is installed around the driver cab. The articulated arm is installed on the rotating shaft so that the articulated arm can rotate around the rotating shaft.

1 . A tractor with a rotatable articulated arm,
 wherein a driver cab is provided with a driver seat and disposed on a body frame at a position displaced to one side from a central portion of the body frame, a rotating shaft is installed around the driver cab, and the articulated arm is installed on the rotating shaft so that the articulated arm can rotate around the rotating shaft.   
     
     
         2 . The tractor with the rotatable articulated arm of  claim 1 , wherein the articulated arm comprises: a rotating boom coupled to the rotating shaft; a first arm hinged to the rotating boom and vertically bent by a first hydraulic cylinder; a second arm hinged to the first arm and vertically bent by a second hydraulic cylinder, with an attachment provided on an end of the second arm. 
     
     
         3 . A tractor with a rotatable articulated arm,
 wherein a rotating shaft is installed around a driver cab, and the articulated arm is coupled to the rotating shaft so that the articulated arm can rotate around the rotating shaft, the articulated arm comprising: a rotating boom coupled to the rotating shaft; a first arm hinged to the rotating boom and vertically bent by a first hydraulic cylinder; a second arm hinged to the first arm and vertically bent by a second hydraulic cylinder, wherein the first arm and the second arm are folded, the first arm and the second arm form a Z shape along with the rotating boom.   
     
     
         4 . The tractor with the rotatable articulated arm of  claim 3 , wherein a bucket is mounted to the end of the second arm. 
     
     
         5 . The tractor with the rotatable articulated arm of  claim 3 , wherein the rotating boom is curved in an arc shape. 
     
     
         6 . The tractor with the rotatable articulated arm of  claim 3 , wherein when the first arm and the second arm are completely folded, the first arm and the second arm are in space defined between four wheels of the tractor. 
     
     
         7 . The tractor with the rotatable articulated arm of  claim 3 , wherein the first arm and the second arm are configured such that when the first arm and the second arm are folded, the first and second hydraulic cylinders are respectively inserted into the first arm and the second arm. 
     
     
         8 . The tractor with the rotatable articulated arm of  claim 3 , wherein the rotating shaft is provided with a sprocket, and a chain is coupled to the sprocket, the chain being connected to first ends of operating rods of a pair of third hydraulic cylinders, so that the rotating shaft is rotated by extension and contraction of the third hydraulic cylinders. 
     
     
         9 . The tractor with the rotatable articulated arm of  claim 8 , wherein the sprocket and the chain coupled to the sprocket form at least a double sprocket-chain structure. 
     
     
         10 . The tractor with the rotatable articulated arm of  claim 8 , wherein each of the third hydraulic cylinder includes a damping bushing provided on a second end of the operating rod, and a damping chamber formed in an end of the third hydraulic cylinder, the damping chamber forming a space into which the damping bushing is inserted, wherein the space has a size at which a fine gap is formed when the damping bushing is inserted into the damping chamber. 
     
     
         11 . The tractor with the rotatable articulated arm of  claim 3 , wherein the rotating shaft is disposed adjacent to a rear end of a side surface of the driver cab, so that the rotating boom can rotate around the rotating shaft within an angular range of 270°. 
     
     
         12 . The tractor with the rotatable articulated arm of  claim 3 , wherein the rotating shaft is fastened to the body frame or a rear axle. 
     
     
         13 . The tractor with the rotatable articulated arm of  claim 2 , wherein a bucket is mounted to the end of the second arm. 
     
     
         14 . The tractor with the rotatable articulated arm of  claim 2 , wherein the rotating boom is curved in an arc shape. 
     
     
         15 . The tractor with the rotatable articulated arm of  claim 2 , wherein when the first arm and the second arm are completely folded, the first arm and the second arm are in space defined between four wheels of the tractor. 
     
     
         16 . The tractor with the rotatable articulated arm of  claim 2 , wherein the first arm and the second arm are configured such that when the first arm and the second arm are folded, the first and second hydraulic cylinders are respectively inserted into the first arm and the second arm. 
     
     
         17 . The tractor with the rotatable articulated arm of  claim 2 , wherein the rotating shaft is provided with a sprocket, and a chain is coupled to the sprocket, the chain being connected to first ends of operating rods of a pair of third hydraulic cylinders, so that the rotating shaft is rotated by extension and contraction of the third hydraulic cylinders. 
     
     
         18 . The tractor with the rotatable articulated arm of  claim 17 , wherein the sprocket and the chain coupled to the sprocket form at least a double sprocket-chain structure. 
     
     
         19 . The tractor with the rotatable articulated arm of  claim 17 , wherein each of the third hydraulic cylinder includes a damping bushing provided on a second end of the operating rod, and a damping chamber formed in an end of the third hydraulic cylinder, the damping chamber forming a space into which the damping bushing is inserted, wherein the space has a size at which a fine gap is formed when the damping bushing is inserted into the damping chamber. 
     
     
         20 . The tractor with the rotatable articulated arm of  claim 2 , wherein the rotating shaft is disposed adjacent to a rear end of a side surface of the driver cab, so that the rotating boom can rotate around the rotating shaft within an angular range of 270°. 
     
     
         21 . The tractor with the rotatable articulated arm of  claim 2 , wherein the rotating shaft is fastened to the body frame or a rear axle.