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有些具隱藏式鑰匙孔之古
鎖的裝置十分巧妙，鎖體的兩
個端面上各裝有一個輪形花樣
摘子，呈對稱狀，其中一面的
摘子是固定的，另一面的摘子
則是活動的，按滑活動摘子才
可移動鎖樑，才能打開蓋板，
才得見鑰匙孔。這類鎖具，由
於開鎖須分四次進行，因此稱
為「四開鎖」；再者，由於必
須打開多重機關才能找到鑰匙
孔，因此又稱為「機關鎖」。
有些古鎖的鑰匙孔隱藏在底面，
其上蓋有鏤成花樣的銅蓋板，
必須滑動銅蓋板才會顯露出鑰
匙孔，此類鎖具稱為「花邊
鎖」。有些古鎖之鑰匙孔為鎖
體與鎖栓間的縫隙，鑰匙為一
薄片金屬，用以從縫中插入開
鎖，此類鎖具稱為「暗門鎖」。
Some l ocks wi t h h i dden
k e yho l e s a r e v e r y d e l i c a t e l y
designed. Both side-ends of the
lock-body have an attached wheel-
shaped button. One is fixed and
the other is movable. When the
movable one is slid upon, the sliding
bolt could then be moved to enable
the covering plate to be opened
and the keyhole is then revealed.
Such locks are named "four-open
locks", since they take four actions
to open the locks. Such locks are
also named "puzzle locks", since the
keyholes are hidden so well such
that many puzzles have to be solved
before finding the keyholes. Some
locks have their keyholes hidden
behind the bottom side and covered
by etched copper plates. The plate
has to be slid aside to reveal the
keyhole. Such locks with hidden
keyholes are named "pattern-side
locks". Some locks with hidden
keyholes are named "hidden-door
locks"; the keyhole of such a lock is
actually a seam between the lock-
body and the sliding bolt that can be
inserted and unlocked by a key with
the shape of a thin piece of metal.