The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 2024
Filed:
Sep. 06, 2023
Zhejiang University City College, Zhejiang, CN;
Xinjiang Wei, Zhejiang, CN;
Zeyu Cheng, Zhejiang, CN;
Hongshui Zhu, Zhejiang, CN;
Shiming Du, Zhejiang, CN;
Jun Zhao, Zhejiang, CN;
Yun Wang, Zhejiang, CN;
Hanhua Zhu, Zhejiang, CN;
Tongchun Han, Zhejiang, CN;
ZHEJIANG UNIVERSITY CITY COLLEGE, Hangzhou, CN;
Abstract
A telescopic device includes a first U-shaped connector with a plurality sets of adjustment slots defined in two sides thereof and arranged along an adjustment direction; a second U-shaped connector defining first through holes in two sides thereof, the second U-shaped connector being inserted into the first U-shaped connector with U-shaped openings thereof opposite to each other to define an accommodating space; a first spring located in the accommodating space and abutting against the first and second U-shaped connectors, respectively; an elastic pin with two ends thereof extending through the first through holes and engaging into one of the plurality sets of adjustment slots; and an initial fixing pin being detachably connected to the first and second U-shaped connectors. A telescopic annular tunnel steel arch includes an upper arch, two lower arches and two telescopic devices connecting two ends of the upper arch to the two lower arches, respectively.