| 摘要 |
A ladder having a first fiberglass rail. The ladder having a second fiberglass rail. The ladder having a one-piece composite rung which is hollow and made of carbon fiber or glass. The rung has a middle and a first end and a second end. The ladder having rivets that extend through the first end and the second end of the rung to attach the rung to the first rail and the second rail. No portion of the rung penetrates any portion of the first or second rails. A method for producing a ladder. A method for forming a one-piece composite rung for a ladder. A method for using a ladder. |
