| 摘要 |
Several embodiments of ladder construction, fabricated by a filament winding process are shown, wherein a continuous glass filament is wound at a controlled helical angle on suitable mandrels and bonded with an epoxy or polyester resin system. Circular, elliptical or rectangular cross-section members can be developed for the rungs and rails and glass fabric or longitudinal fiber members may be combined therewith for additional strength. The rungs and rails are machined and joined with a resin bonding agent and the assembly cured in single section, extension ladder, or section ladder configurations. In the latter, reinforcement of the notched ends is made with plies of resin impregnated glass strips filling the rail cavity in conformity with the notch.
|
