US Patent 10052756 Industrial robot

An industrial robot may include a main body; a hand; and an arm having a top end side and a root end side, the top end side being rotatably connected to the hand and the root end side being rotatably connected to the main body. The arm may include a first part having a top end side and a root end side; and a second arm part having a top end side. The hand may be rotatably connected to the top end side of the first arm part. The root end side of the first arm part may rotatably connected to the top end side of the second arm part. The top end side of the first arm part is a reducing-width part where a width gradually narrows in a direction from the root end side of the first top-end-side arm part to the top end side.