US2110155A - Writing board - Google Patents

Description

March 8, i938. R, lBENDORFF 2,10A,155

WRITING BOARD Filed Jan, z, 193e Patented Mar. 8, 1938 UNITED STATES PATENT OFFICE Application January 3, 1936, Serial No. 57,356 In Germany December 12, 1933 4 Claims.

This invention relates to a board for writing, painting and modelling purposes and of the kind wherein one or both sides are provided with a writing or like surface composed of a powder mixed with a pigment and a binding material.

Known boards of this kind have a support which is either rigid or pliable but which is not absorptive, so that it cannot enter into intimate connection with the material forming the writ- 0 ing or like surface. The board is therefore either incapable of bending or liable, if bent, to cause cracking and scaling of the writing surface.

The object of the present invention is to obviate this defect, and the invention consists essentially in the provision of a support composed of impregnated felt or equivalent material, the said felt or the like being impregnated with any suitable material which will serve to stiften it without wholly depriving it of its absorptive properties.

Fig. 1 of the accompanying drawing, represents a sectional view of a writing or like board constructed according to the invention.

Fig. 2 is a perspective View of the framed board, and

Figs. 3 and 4 are fragmentary sections showing diierent modifications of the board mounting.

The board comprises a support I of felt or the like impregnated with any suitable material which will serve to stiifen it without wholly depriving it of its absorptive properties and provided with a facing 2 of mealy consistency obtained from charcoal, soot, graphite, pumice stone, ground slate or the like mixed withpigments, resin or other binding material, the material being applied to the felt surface .and left to dry. 'I'he facing has approximately the same mechanical properties as the felt support and will therefore enter into intimate connection with the latter. At the same time it is pliable enough to prevent cracking and scaling of the facing.

'I'he board may be mounted on a base 3 of sheet metal the edges 4 of which are folded over the 5 edges of the board, as shown in Fig. 3. However, it is sufficient to fit the board, as shown in Fig. 5, in a metal frame 5 which only covers the edges. In the latter instance the back of the board may 5o be coated with a suitable lacquer. It is also possible to provide both sides of the board with a writing or like surface.

The surface may have any suitable colour. The binding material may advantageously consist of a mixture containing fat and resin or a 5 colourless matt lacquer.

For modelling purposes the facing may consist entirely of such binding material alone, or a composition known under the trade-mark of Plasticine.

I claim:

1. A board for Writing, painting and modelling purposes, comprising a felt support impregnated with a material which serves to stiifen it without Wholly depriving it of its absorptive properties, 15 and a facing to the said support composed of a fine-granular pulverulent material and a binding agent adapted together to form a pliable writing or modelling surface on and intimately combining with the said support.

2. A board for writing, painting and modelling purposes, comprising a felt support impregnated with a material which serves to stiifen it without wholly depriving it of its absorptive properties, a facing to the said'support composed of a ne- 25 granular pulverulent material and a binding agent adapted together to form a pliable writing or modelling surface, and a matt lacquer coating on the said facing.

3. A board for writing, painting and modelling 30 purposes, comprising a felt support impregnated with a material which serves to stiifen it without wholly depriving it of its absorptive properties, and a facing to the said support composed of one or more of the following materials: charcoal, soot, 35 graphite, pumice stone, ground slate in combination with a binding agent to form a pliable writing or modelling surface on and intimately combining with the said support.

4. A board for writing, painting and modelling 40 purposes, comprising a felt support impregnated with a material which serves to stiffen it without wholly depriving it of its absorptive properties, and a facing to the said support composed of one or more of the following materials: charcoal, soot, graphite, pumice stone, ground slate and a resin acting as binding agent, the said facing intimately combining with the said support.

RUDOLF IBENDORFF.

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