US2704533A

US2704533A - Writing instruments

Info

Publication number: US2704533A
Authority: US
Publication date: 1955-03-22
Anticipated expiration: 1972-03-22

Description

22, 1955 J. P. SPALLINI 2,704,533

WRITING INSTRUMENTS Filed Sept. 18, 1952 United States Patent O WRITING INSTRUMENTS Jos Paulo Spallini, Sao Carlos, Sao Paulo, Brazil, as-

signor to Lapis Johann Faber Ltda., Sao Carlos, Sao Paulo, Brazil Application September 18, 1952, Serial No. 310,159

Claims. (Cl. 1Z0-42.4)

The present invention relates to a new type of writing instrument and a method of manufacturing the same.

Writing instruments are already known which have a metal tip with a small ball which glides on the surface of the paper and which are provided with ink reservoirs separate from the body or casing itself of the instrument, said reservoirs being made of metal, plastic material, rubber or other suitable material. Apart from these instruments, there are others in existence the body or casing of which forms the ink reservoir, which, however, is made of plastic material.

The present invention has for its object to provide an improved and novel form of writing instrument and method of manufacture thereof of the type known as spherographical or ball point pens, so called because their writing points are formed by a small ball housed in a metal body.

The invention is described below and illustrated in the accompanying drawing wherein:

Figure 1 is a sectional view of a writing instrument embodying the invention;

Figure 2 is a fragmentary perspective view of a board or piece of wood showing channels or grooves of semicircular section, illustrating a step in the method of manufacture;

Figure 3 is a fragmentary perspective view of two like boards as shown in Figure 2, joined together and showing inside each channel or groove a round wire of smaller diameter;

Figure 4 is a view in the direction of the arrow IV with the original casing shown in dash-dot lines and the ends of individual Writing instruments shown in full lines; and

Fig. 5 is a cross-section taken along the plane V--V of Fi 1.

its can be clearly seen from Figures 1 and 5 of the drawings, the writing instrument in accordance with the invention, comprises a body or casing generally denoted by of wood in the form of a pencil. The casing 10 includes an upper half 12 and a lower half 14. The

halves

12 and 14 are provided on the inside thereof with

semi-cylindrical grooves

16 and 18, forming an ink reservoir protected by

coatings

20, 22. A hole 24 is provided in a metal part 26 arranged at one of its ends for the entry of air. A metal tip or point 28 with the usual small writing ball 30 is secured at the other end of the writing instrument.

Figures 2, 3 and 4 illustrate the manufacture of the writing instrument, which comprises the following steps.

(1) Impregnating a wood plate such as 32 with a substance which is not soluble in the ink of the writing instrument, such as, for example, a solution of Bakelite, of a cellulose ester or one of the plastic materials group;

(2) Forming the

protective coatings

20, 22 on the walls of the

semi-cylindrical grooves

16, 18, which process comprises essentially the following details. Channels or

grooves

16, 18 of semi-circular section are first cut in boards or pieces of wood such as 32 of suitable dimensions (Figure 2). To the grooved side of the board 32 there is then applied a thick layer or coating 34 of glue Patented Mar. 22, 1955 ICS which cannot be dissolved by the ink of the writing instrument and round wires 36 are next introduced into each of the grooves or

channels

16, 18 or only into one (Figure 3), said Wires having a smaller diameter than the channel or

grooves

16, 18. Two

similar boards

32, 38 are thereafter joined together at the grooved and glue-covered sides and the two

boards

32, 38, which form a whole, are subjected to strong pressure for the purpose of obtaining a perfect joint. After the glue has dried, the wires 36 which, before being introduced, may be passed through a substance which prevents sticking, are withdrawn. The double board 40 thus obtained, with the channels 42 already completely prepared and protected (Figure 4) are passed through a planer or cutter, which separates the cylindrical bodies or casings, there thus being obtained a number of wooden writing instrument casings containing the channel 42 comprising the two grooves 16, 18 (Figure 1) serving as the ink reservoir, which is protected by the

coatings

20, 22 of glue. Finally, the metal tip or point 28 with the small ball 30 is applied.

The protective layer or coating formed by the

glue coatings

20, 22 may be reinforced by another thin layer from among materials insoluble in the ink of the writing instrument, namely, Bakelite, cellulose esters or plastic materials, or animal or vegetable glues.

The application of this layer may be effected by either of the following methods:

(a) Painting the channel by means of a small round brush with a suitable solution of one of said materials; or

(b) Filling the channel with a solution of one of the materials mentioned above, and allowing the surplus to run off. A certain quantity adheres to the walls of the channel and, after the solvent has evaporated, forms the protective layer.

What I claim is:

l. An ink operated spherographic writing instrument, comprising, in combination, a wooden casing including two grooved halves having surfaces abutting against one another, a glue material insoluble in the ink operating the spherographic writing instrument, said glue material joining said abutting surfaces of said halves of said casing so as to form a body having a central channel for the reception of the ink, a metal tip arranged at one end of said body, a writing ball arranged at one end of said metal tip so as to close one end of said channel, and a protective coating arranged on the inner wall of said channel of said body, said protective coating being insoluble in ink.

2. A writing instrument as claimed in claim l, and a thin layer consisting of a material insoluble in ink, said thin layer covering said protective coating on the side thereof turning opposite to said body.

3. A writing instrument as claimed in claim 2, said thin layer consisting of Bakelite.

4. A writing instrument as claimed in claim 2, said thin layer consisting of a cellulose ester.

5. A writing instrument as claimed in claim 2, said thin layer consisting of a plastic material.

References Cited in the tile of this patent UNITED STATES PATENTS 646,070 Goldsmith Mar. 27, 1900 2,303,916 De Samsonow Dec. l, 1942 2,452,200 Kvalnes et al. Oct. 26, 1948 2,455,427 Loughborough Dec. 7, 1948 2,494,412 Simkins Jan. 10, 1950 2,557,409 Brenson .Tune 19, 1951 2,591,771 Bergey Apr. 8, 1952 2,606,529 Wagner Aug. l2, 1952