| 摘要 |
A pneumatic damper for a ladder with telescopically collapsible stile sections. The damper having a plug 14 for closing off the lower end of an upper stile section 10b in each pair of adjacent stile sections, and a seal 16 projecting radially from the plug so as to contact the inner wall of the lower stile section 10c of the pair. During collapse of the stile sections of the pair, the upper style section acts as a piston to compress air present within the lower section. The seal may be an annular skirt that is separate from the plug. The plug may have a circumferential groove (20, Fig. 3) and the skirt may have an inwardly extending flange (24, Fig. 2) at an upper end that is received in the groove. The seal may have a gap to allow air to pass between the skirt and the inner wall. |
