Device for interlocking perforated writing material

Abstract

Device for interlocking a stack of writing material having perforations formed therein along a margin thereof, the perforations formed in the writing material being aligned in the stack thereof so as to form respective through-bores extending from opposite marginal surfaces of the stack that are disposed adjacent to and on both sides of a back surface of the stack, includes two binding strips of identical construction, each of the binding strips having a first portion engageable with the back of the writing-material stack for covering at least part thereof, and a second portion engageable with and covering a respective one of the opposite marginal surfaces of the stack, each of the binding strips further having stringing rods and sleeves extending from the respective second portion thereof, the rods and sleeves being disposed in mutually alternating sequence and having a mutual spacing corresponding to the spacing of the aligned holes formed in the stack of writing material, the rods being formed with outer detents along the length thereof and the sleeves being formed with corresponding inner detents along the length thereof, the rods of each of the two binding strips being lockingly engageable in the sleeves of the other of the two binding strips by the detents thereof within the respective through-bores formed in the stack of writing material.

Dependencies are inferred from the claim text.