Chains for power transmission

A power transmission chain comprising:

• a plurality of links, each link having a pair of pin apertures connected to each other by at least one connecting pin inserted into each of the pin apertures, thereby forming a joint;
• and
• a bending-restraining mechanism comprising a wire extending substantially along a length of the chain and engaging at least three adjacent joints of the chain comprising an inner joint and a pair of outer joints;
• wherein the wire is formed such that:
• the wire elastically deforms when an inside link rotates around the inner joint in a first direction from the linearly extending state, the wire thereby applying a bending resistance to the inside link during articulation of the chain;
• and
• a predetermined bias due to a bending deformation of the wire is applied to the inside link when the chain is extended linearly.

A power transmission chain comprising:

• a plurality of links, each link having a pair of pin apertures connected to each other by at least one connecting pin inserted into each of the pin apertures, thereby forming a joint;
• and
• a bending-restraining mechanism comprising a wire extending in a lengthwise direction along the chain and engaging at least three adjacent joints of the chain comprising an inner joint and a pair of outer joints;
• wherein the wire is formed such that:
• the wire weaves alternatively over and under the joints;
• and
• the wire elastically deforms when an inside link rotates around the inner joint in a first direction from a linearly extending state, the wire thereby applying a bending resistance to the inside link during articulation of the chain.