| 摘要 |
A strong, light-weight flexible bearing, particularly suitable for use in mounting a movable thrust nozzle to a rocket case, is made by stacking reinforced plastic shims, having the forms of concentric, spherical zones, alternately with layers of elastomer and bonding them together. A protective heat and flame barrier is formed by providing an especially refractory outer edge on each shim, which extends beyond the layers of elastomer. Each shim is made by: preparing a mold surface that forms a spherical zone of unique radius; filling a refractory cloth with a curable, liquid resin; placing segments of the cloth on the mold surface in an overlapping arrangement until the desired shim thickness is attained; preparing a second mold surface substantially parallel to the first: clamping this over the cloth segments on the first mold surface; and applying heat and pressure to the cloth segments until the resins are cured. The protective edge is formed on each shim by attaching an edging of resin-filled cloth, of especially refractory properties, to the outer edge of at least some of the segments before arranging them in the mold.
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