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Youblob · CC0
Elastic Cord: Cotton Braided over a Stretched Rubber Strand (Blakesley 1889)
Braid cotton round a rubber strand while the rubber is stretched, and the cord springs back when it is let go. Gilbert Blakesley of Bristol, Connecticut set the stretch so that the braid stops the cord before the rubber is pulled past the point it fully recovers from, and so that at rest the rubber carries no tension at all. The braid protects the rubber and it lasts.
Source: G. H. Blakesley, US 411,416 (1889). The rubber strand is our rubber thread blueprint; the tools are ours. Picture drawn by Youblob.
中级
2 hours
说明
1
1
Feed the rubber under tension
Feed the rubber under tension
Pass a long rubber strand, or several, under tension through a braiding machine. Round or flat, one strand or more: Blakesley says it does not matter.
此步骤所需材料：
橡胶丝1 as required所需工具：
编织机2
2
Braid on a cotton cover
Braid on a cotton cover
Let the machine braid a covering of cotton thread over the stretched rubber with a rapid feed.
此步骤所需材料：
棉线1 as required所需工具：
编织机3
3
Set tension against feed
Set tension against feed
Adjust the rubber tension and the braider feed so that, when the cord is pulled, the braid reaches its full length before the rubber reaches its safe stretch, the stretch it fully recovers from without risk of breaking. At rest, the rubber should be under no tension at all.
所需工具：
编织机
直尺4
4
Optional soft second cover
Optional soft second cover
For a softer cord, pass it again, under tension, through a braider that lays a loose second covering of soft thread such as silk or wool.
此步骤所需材料：
丝线1 as required所需工具：
编织机5
5
Reel it
Reel it
Wind the cord on a reel as it leaves the braider.
所需工具：
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