Patent ID: 9333636
Filing Date: 2016-05-10
CPC Classification: A01D,B25F,F16C,F16D

Claim Text:
1. A work machine, comprising: a proximal end; a distal end; a main pole internally comprising a separable rotation shaft, the main pole extending in a longitudinal direction between the proximal end and the distal end, and the main pole comprising a first partial pole, a second partial pole and a joint member, the joint member having a through hole configured to accept insertion of the first partial pole from a first side of the through hole, wherein the first partial pole is configured to be removably inserted into the first side of the through hole, and the joint member being attached to the second partial pole at a second side of the through hole, the first partial pole having a positioning member configured to be biased by a biasing member toward the joint member, the joint member having a positioning hole configured to engage with the positioning member and a guide groove extending from the positioning hole toward the first side of the through hole and configured to guide the positioning member to the positioning hole, the guide groove penetrating an inner surface of the joint member, the guide groove comprising a first tapered section and a second tapered section adjacent to each other in the longitudinal direction, wherein the first tapered section has a different inclination than the second tapered section, and wherein a depth of the guide groove, as defined by the tapered sections, increases in a direction from the positioning hole toward the first side of the through hole, a tool unit located the distal end, the tool unit configured to hold a tool connected to the rotation shaft; and a power unit located at the proximal end, the power unit comprising a prime mover configured to drive the rotation shaft.