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US 5,288,270 AGranted
Flexible shaft having element wire groups and lubricant therebetween
AssigneeTaisei Kohzai Kabushiki Kaisha
InventorYoshiaki Ishikawa
Life of this patent
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Abstract
A flexible shaft has an inner shaft with a steel core wire and element wire groups which are formed by closely adhering a plurality of steel element wires into band shapes wound around the steel core wire by turns in reverse directions relative to each other. The plurality of element wire groups are formed in layers and in concentric sections. Lubricant is impregnated in clearances between the plurality of steel element wires.
Claims3
A flexible shaft, comprising:
- an inner shaft having a steel core wire and element wire groups which are formed by closely adhering a plurality of steel element wires into band shapes wound around the steel core wire by turns in reverse directions relative to each other and the plurality of element wire groups being formed in layers and in concentric sections;
- and
- vacuum-impregnated lubricant impregnated within clearances between the plurality of steel element wires, wherein said vacuum-impregnated lubricant substantially surrounds the periphery of said steel core wire and each of inner ones of said plurality of steel element wires, and said vacuum-impregnated lubricant substantially fills up spaces between said steel element wires, wherein the lubricant is impregnated at a temperature higher than a normal temperature of the flexible shaft when in use.
Dependencies are inferred from the claim text.