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鑰匙圈.
鑰匙圈又稱鑰匙扣、鎖匙扣,是一個用來扣住鑰匙和其他東西的環(一般材質是金屬或者塑膠),有時候會與鑰匙链連在一起。有的鑰匙圈是用皮革,木頭,或者橡膠做成的。
最常見的鑰匙圈是一片頭尾有重疊的金屬環。兩端都可以撬開來讓鑰匙能滑入環中,直到鑰匙完全進入環的內部。另外也有的鑰匙圈會加上很多裝飾物來作為辨識,這些有裝飾物的鑰匙圈也常會被人掛在袋子上作為裝飾。
有的鑰匙圈會使用沒有重疊部份的金屬或塑膠環,但是利用其它機制(像是卡榫之類)來讓這個環可以適當地打開與關閉。
物理結構
鑰匙圈包含一個一般來說是鋼製的金屬環。這裡的鋼通常會鍍上鉻來避免生鏽。金屬鑰匙圈會使用高強度的鋼並且讓這個環的形狀能給予自身壓力,以維持自身的剛性。同類型的金屬也被使用在一些老式的汽車懸吊系統上,利用其剛性來避免汽車瓦解。
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