| 摘要 |
A folding fire-escape ladder with safety belt, made of two U-shaped channels (A,S), which form the side rails, and rungs (W) of square tubing. The rungs are attached to the side rails by articulated joints. The ladder has a burglar proofing device on the top (J,K). One or more separate release points at escape stations can be installed by sawing through the outer rail (A) to form at least two sections thereof and by fixing a release bracket (O) to a section of the outer rail (A) above the cut. The release bracket (O) has a collar (R) which replaces the material removed by the saw. Joining the upper and lower sections of the outer rail (A) at the release point/escape station is achieved by a locking plug (K) which is fitted through axially aligned holes in the outer rail (A) and the release bracket (O). A safety belt (E) is attached to the outer rail (A) by a locking bracket (B) which is threaded onto the outer rail (A) either from the top, or through a threading slot (G) at the escape station which corresponds to the width of the locking bracket (B). The widest locking bracket (B) is placed at the top escape station and the threading slots (G) become sequentially narrower at lower escape stations to enable the locking bracket (B) to slide over the threading slots therebelow. The rungs (W) lock against unfolding beyond 90 DEG since their ends engage against the walls of the side rail sections (A,S). Wall fixing brackets (P) are shaped to fit the inner rail (S) and are fixed thereto by the same bolt fixtures connecting the rungs (W) to the side rails (A,S), to thereby stabilize the ladder against lateral movement.
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