jack ladder

基本解释

Annie and Jack started up the rope ladder .
安妮和杰克抓住绳梯，开始向上爬。
The emergency escape device for high rise building consists of jack ladder, guide track, chain wheel, speed varying mechanism, hydraulic speed regulating controller, etc.
本发明是一种高层建筑遇险时紧急逃生装置，也是一种理想的消防设施。该装置主要由链梯、导轨基架、链轮、变速机构、液压调速式控制器等组成。
ip.com
The invention relates to an apparatus used for maintaining a transmission facility, in particular to a jack ladder grapnel suitable for double-cracking type and four-cracking type divided conductors.
本发明涉及一种输电线维护用器具，尤其是一种适用于双分裂、四分裂式分裂导线软梯头抓钩。
ip.com