The typical binder has two posts, which may either be self-locking or locked by caps or knurled thumb screws. In the so-called flexible chain post binder, the book is compressed by a link mechanism operated by a key or crank. It is also possible to construct post binders that cannot be tampered with. A lock in the back of the binder which must be opened with its own key is provided for this purpose.
Post binders use punched or slotted leaves, the latter allowing exchange of sheets without the binding having to be removed. A superior type of post binder has the top and bottom strips of metal, with the posts fastened to the bottom plate, the top plate sliding on them. The top plate has a lock which grips both posts, which can be released by turning a key or sliding a latch. Also called "transfer binder." (320 , 339 )
Timestamp: Saturday, 19-Nov-2011 13:18:43 PST
Retrieved: Tuesday, 21-May-2019 17:19:05 GMT