Books – strips – and leaves – Book – element thereof – or accessory therefor – Binding
Patent
1992-12-30
1995-08-15
Eley, Timothy V.
Books, strips, and leaves
Book, element thereof, or accessory therefor
Binding
412901, 402 79, 281 38, B42D 302
Patent
active
054413087
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a filing device comprising a front cover, a spine, and a rear cover, and by which documents, document pouches, photo-mounting sheets, postcards and all other types of sheet-like material can be detachably secured at their edges to the inner side of the spine.
2. Description of the Related Art
Known filing devices by which sheet-like materials such as documents are filed and stored include binders in which sheet-like materials having punched holes are received by binding elements or binding rings.
The above-mentioned binders retain the documents filed therein and are convenient for storage. However, they have drawbacks in that holes must be punched in each document to be filed, and that documents which cannot have holes punched therein can not be filed. In addition, since free space is required for the punched holes, documents having no such free space had to be photocopied to create such free space. Further, when documents are removed from the middle of the binder, and when they were re-inserted, the documents located in front of the documents to be removed also had to be removed and re-inserted, which makes removal and re-insertion of the documents bothersome.
A device which would not require punching holes in the documents could be realized by using adhesives or pressure-sensitive adhesives, and in fact filing devices have been proposed for securing sheet-like materials such as postcards by adhering front or rear edges or side edges thereof to the binder using adhesives or pressure-sensitive adhesives. However, once attached, these materials cannot be removed, and if they are forcibly removed, the bonded area peels off and remains on the adhesives, whereby the materials cannot be readhered or re-filed. There is also the problem that the adhesion diminishes due to a gradual hardening of the adhesive substance or to dust.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a filing device by which sheet-like materials can be detachably secured at their edges to the inner side of the spine in a reliable manner without the use of punched holes, and also to provide supplemental sheet-like materials to be used with the filing device.
Another object of the present invention is to provide a filing device which does not rely on conventional adhesives or pressure-sensitive adhesives but instead employs an adhesive substance which has an adhesive property sufficient to retain sheet-like materials at their edges, which does not peel the edges of the sheet-like materials and which is not transferred to the edges of the sheet-like materials when the sheet-like materials are detached therefrom. To achieve this object the invention employs a polyurethane elastomer as the adhesive substance.
Polyurethane elastomer is very versatile. The present invention employs a soft polyurethane elastomer having continuous high adhesion at room temperature, a non-staining property which means that the adhesion is not degraded by dust because dust adhered thereto can be easily removed by wiping the dust therefrom with a wet cloth, and relative pliability.
The desired adhesive strength of the polyurethane elastomer is 450 g/cm for a 180.degree. peeling force, and 115 g/cm for a 90.degree. peeling force. The pliability is preferred to be less than 10.degree. in hardness.
The adhesion of the polyurethane elastomer varies depending on the proportion of polyol and isocyanate. It is advisable to select the components and proportion thereof from reactive mixtures with excess polyol in order to obtain an adhesive property suitable for the purpose of this invention. Selection shall be made from the view points of not only adhesion, but also other factors such as non-likelihood of causing paper smears, transparency, non-yellowing, durability and so forth. In forming the polyurethane elastomer, the reaction may be accelerated by using curing agents and cross-linking agents and either a one-shot method or a pre-polymer method may
REFERENCES:
patent: 1769395 (1930-07-01), Selden
patent: 2277265 (1942-03-01), Zahniser
patent: 5011187 (1991-04-01), Hunder et al.
Eley Timothy V.
Maruni Kasei Kabushikigaisha
Nguyen K. V.
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