Seidel, Gonda, Lavorgna & Monaco
Boring casing for boring machines
 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. 
Tao Nenryo Kogyo Kabushiki Kaisha
F B E B B E B B F F
F16C B29C E21B B29C B29C E21B B29L B29D F16L F16L
inventional inventional inventional inventional inventional inventional additional inventional inventional inventional
Naohiro Hiroyuki Akira
Ohori Yoshizawa Kobayashi