Why is 饰界 used to mean "hinges" in a 1908 book?
It means &quot;hinge&quot; in old Chengdu dialect.
The source is the same the one I mentioned in the other post, a 2006 research thesis from Waseda University Graduate School of Letters:
成都方言の文法研究 A study of Chengdu dialect grammar
The third file &quot;Honbun-4423.pdf&quot; from this download page is the paper I'm referring to.
Same as in the other post, in Appendix 4 you can see the following footnote in Japanese:

括弧内の文は現代成都方言の言い方である
The statements between brackets are in the modern Chengdu dialect

The at page 236 you can find an exact match of your example number 13 you posted here.

13． 門靠着飾界轉 （門靠倒飾界轉）
Men2 kao4 dzo2 si4 jien4 dzuan3

Between brackets, the modern version.