| 摘要 |
Disclosed is a jointed arm which has a rod with reinforced strength so that breakdowns during work and the danger of accidents is reduced and which looks good because wires or tubes are well arranged. The disclosed jointed arm comprises: a first rod of which one side end connects with a pillar by at least one first rod connection joint so that the other side end is able to rotate upwards and downwards; a second rod of which one side end connects with the other side end of the first rod by at least one second rod connection joint; a handpiece connecting with the other side end of the second rod by at least one handpiece connection joint; and a power supply line for supplying power to the handpiece, or a tube for supplying fluid to the handpiece. The first rod comprises: a pipe extending in a linear direction; and a reinforcing bar surrounding the pipe and extending along the extended direction of the pipe so as to reinforce the strength of the pipe. The power supply line or the tube is inserted into the reinforcing bar and penetrates the reinforcing bar in the length direction thereof to extend to the handpiece. |
