US 12,419,205 B2
Tractor having mechanical linkage for selective draft control or depth control
Daisuke Nakayama, Sakai (JP); Hironobu Nogami, Sakai (JP); Norihide Iwata, Sakai (JP); Katsumi Yanagihara, Sakai (JP); Naoto Mantoku, Sakai (JP); and Keita Ono, Sakai (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Appl. No. 17/614,066
Filed by KUBOTA CORPORATION, Osaka (JP)
PCT Filed May 29, 2020, PCT No. PCT/JP2020/021264
§ 371(c)(1), (2) Date Nov. 24, 2021,
PCT Pub. No. WO2020/241811, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-100766 (JP), filed on May 29, 2019; and application No. 2019-100767 (JP), filed on May 29, 2019.
Prior Publication US 2022/0225556 A1, Jul. 21, 2022
Int. Cl. A01B 63/112 (2006.01); A01B 63/114 (2006.01)
CPC A01B 63/114 (2013.01) [A01B 63/112 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A tractor comprising:
a three-point linkage to which a tiller is mountable;
a hydraulic lifting/lowering driver to lift and lower the three-point linkage; and
a mechanical linkage to transmit a lifting/lowering operation amount of the three-point linkage to the lifting/lowering driver; wherein
the mechanical linkage includes:
a load detector to detect an amount of change in traction load via the three-point linkage;
a cable to interlock according to the amount of change in the traction load detected by the load detector; and
an intermediate linkage interlocked and connected to the cable and the lifting/lowering driver, the intermediate linkage being capable of transmitting the lifting/lowering operation amount according to the amount of change in the traction load to the lifting/lowering driver;
the cable includes:
a first connecting portion directly connected to the intermediate linkage;
a second connecting portion directly connected to the load detector; and
a portion extending from the second connecting portion toward a backward direction of the tractor;
one end of the cable is connected to the intermediate linkage toward a forward direction of the tractor;
another end of the cable is connected to the load detector toward the forward direction of the tractor;
the load detector includes:
a mounting portion to which the second connecting portion is mounted; and
a swing to swing back and forth according to a back and forth swing of the load detector;
the cable extends curvedly so that when the second connecting portion swings forward together with the swing, the first connecting portion is pulled backward, and when the second connecting portion swings backward together with the swing, the first connecting portion is pulled forward, in a side view of the tractor; and
the second connecting portion is mounted to the mounting portion at a position higher than the first connecting portion.