Patent ID: 9046152
Filing Date: 2015-06-02
Classification: F16G

Abstract:
1. A chain connection link comprising: a pair of U-shaped links of a U-shaped configuration in a front view, each of the U-shaped links having a first arm and a second arm, the first arm being disposed at a first side of each of the U-shaped links, and the second arm being disposed at a second side of each of the U-shaped links; a first connection arm portion provided at an end portion of the first arm of a first one of the U-shaped links, and a second connection arm portion provided at an end portion of the first arm of a second one of the pair of U-shaped links; a first connection groove-shaped arm portion provided at an end portion of the second arm of the first one of the U-shaped links, and a second connection groove-shaped arm portion provided at an end portion of the second arm of the second one of the pair of U-shaped links; and through-holes provided for passing a connection shaft in the first and second connection arm portions and the first and second connection groove-shaped arm portions, wherein the first connection groove-shaped arm portion has a first groove, and the second connection groove-shaped arm portion has a second groove, wherein the first connection groove-shaped arm portion is formed by a first outer arm portion and a first inner arm portion, the first outer arm portion being disposed on a first side of the first groove, and the first inner arm portion being disposed on a second side of the first groove, wherein the second connection groove-shaped arm portion is formed by a second outer arm portion and a second inner arm portion, the second outer arm portion being disposed on a first side of the second groove, and the second inner arm portion being disposed on a second side of the second groove, wherein the first connection arm portion is fit-engaged with the second connection groove-shaped arm portion, the connection shaft being passed through the through-holes to connect the pair of U-shaped links, wherein an outer diameter of each of the first and second connection groove-shaped arm portions is larger than an outer diameter of each of the first and second connection arm portions such that the first and second connection arm portions do not come into contact with or collide with a suspended cargo, and wherein a relationship among (i) a thickness of each of the first and second outer arm portions, (ii) a thickness of each of the first and second inner arm portions, and (iii) a thickness of each of the first and second connection arm portions in a direction in which the through-holes extend is as follows: the thickness of each of the first and second connection arm portions>the thickness of each of the first and second outer arm portions>the thickness of each of the first and second inner arm portions.