Device for interlocking perforated writing material
US4175880A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1977 |
| Grant date | Nov 27, 1979 |
| Priority date | — |
| Expiry date | Sep 16, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42F13/34
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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 locking…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.