Expansible spring-loaded retention clamp for books or other objects

摘要: A dual element, spring-biased clamping device such as a bookend is proposed in which the pressure exerted by elements can be varied while maintaining relative separation of elements. One element comprises polygonal wall to tethering cord attached, being spring-mountedly held within another element. In use, successive walls brought bear against retained objects an over-center relationship with edge portions disposed between adjacent walls, causing snap tightly into place books.