2.3.1 A Attachment
An A attachment is most commonly used. It has a bent link plate that extends out on one side of the chain, forming an L-shape. It comes with one or two bolt holes, which are referenced A-1 or A-2, respectively (Figure 2.16). The attachment interval can vary (for example, on each chain link, every five links, or two attachments in a series with intervals every four links, etc.). Generally two strands of chains with slats are used (Figure 2.17).
Figure 2.16 A-2 Attachment
Figure 2.17 A-2 Attachment with Slat
Attachments are subjected to bending force. If they convey heavy objects, have long jigs installed, or receive side loads, twisting force is added to the bending force. Depending on the application, make sure you consider these forces in your calculations.
The shape of the attachment influences the design of the equipment. If slats do not cover the chain rollers, guide rails may be used to support the chain rollers on the return side.