Dec 16, 2025

US12497813 - Protective apparatus and aerial work device

A protective apparatus and an aerial work device are disclosed. The protective apparatus comprises a bracket ( 1 ) and a cover ( 2 ); the upper side of the cover ( 2 ) is hinged to the upper side of the bracket ( 1 ); the protective apparatus further comprises a pull-down apparatus ( 4 ); the pull-down apparatus ( 4 ) comprises a fixed pulley ( 403 ), a movable pulley ( 404 ), a push rod ( 407 ) and a pull rope ( 401 ); the fixed pulley ( 403 ) is fixedly connected to the cover ( 2 ); the movable pulley ( 404 ) is located above the fixed pulley ( 403 ); the movable pulley ( 404 ) is slidingly connected to the cover ( 2 ); a fixed end of the pull rope ( 401 ) bypasses the movable pulley ( 404 ) and is connected to the fixed pulley ( 403 ); and an upper end of the push rod ( 407 ) is connected to the movable pulley ( 404 ). These and other embodiments and variations are more fully disclosed herein.

Assignee: Hunan Sinoboom Intelligent Equipment Co., Ltd
Inventors: Xiping Li, Guoliang Liu, Jiping Zheng
Filing date: 2021-12-03

This patent describes a protective apparatus featuring a bracket and a hinged cover, which incorporates a pull-down mechanism utilizing fixed and movable pulleys, a push rod, and a pull rope. The design allows for the cover to be lowered and raised through the action of gravity and mechanical movement, enhancing operational efficiency.

Claim 1

1 . A protective apparatus, comprising a bracket and a cover, the upper side of the cover is hinged with the upper side of the bracket, wherein the protective apparatus comprises a pull-down apparatus, the pull-down apparatus comprises a fixed pulley, a movable pulley, a push rod and a pull rope, the fixed pulley is fixed connected to the cover, the movable pulley is located above the fixed pulley, the movable pulley is sliding connected to the cover, the fixed end of the pull rope bypassing the movable pulley is connected to the fixed pulley, the upper end of the push rod is connected to the movable pulley , and the push rod and the movable pulley cause the handle end of the pull rope to hang down under the action of gravity, pull down the handle end of the pull rope to move the cover downwards, after the lower end of the push rod contact the bracket , and push the movable pulley upwards to drive the handle end of the pull rope upwards.

Google Patents

https://patents.google.com/patent/US12497813

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12497813