Boring casing for boring machines
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United States of America Patent
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Aug 17, 1993
Issued Date -
N/A
app pub date -
Aug 24, 1992
filing date -
Jun 24, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A bar-like molding made of fiber-reinforced plastic materials of the type which can be extended by connecting pieces thereof, comprises a fiber-reinforced plastic covering layer formed by laminating a plurality of fiber-reinforced plastic layers and short length metal pipes for connection arranged at the ends of the fiber-reinforced plastic covering layer, the fiber-reinforced plastic covering layer including an inner fiber-reinforced plastic covering layer composed of a plurality of fiber-reinforced plastic layers and abutting at its ends against the respective inner end surfaces of the short length metal pipes for connection, and an outer fiber-reinforced plastic covering layer composed of a plurality of fiber-reinforced plastic layers and formed in such a manner as to cover the outer peripheries of said inner fiber-reinforced plastic covering layer and the short length metal pipes for connection, the reinforcing fibers of at least one of the plurality of fiber-reinforced plastic layers of at least one of the outer reinforced plastic covering layer and the inner reinforced plastic covering layer being arranged in the axial direction of the bar-like molding. Preferably, at least the outermost layer of the outer fiber-reinforced plastic covering layer is formed as a layer whose reinforcing fibers are arranged 90.degree. to the axial direction.
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