FR2520678A1 - TIP FOR STYLOS WITH BALL - Google Patents

Abstract

THE PRESENT INVENTION RELATES TO A TIP FOR BALLPOINT PENS. IT HAS A DRILLED SLEEVE 2 WITH WHICH ENGAGES ONE 3A OF THE ENDS OF A SMALL STEEL TUBE 3 ALSO PROVIDED WITH A LONGITUDINAL PASSAGE HOLE 9, THE OPPOSITE END 3B OF THIS SMALL TUBE EXTENDING THE SLEEVE 2 AND BEING PROVIDED WITH A STEEL BALL 4 HOUSED IN A CELL 10 INSIDE THIS SMALL TUBE 3 AND THE BUSH 2 EXTENDING A BRAID 5 OF TEXTURED POLYESTER FIBER WIRES 4, WHICH HAS THE ONE OF ITS ENDS 5B FIXED IN CORRESPONDENCE OF THE END 3B OF THE SMALL TUBE 3 PROVIDED WITH PUNCHES 11, WHILE ITS OTHER END 5B OVERFLOWS THE BUSH 2 AND IS FLOODED IN AN INK HOLDER 12 BEHIND THE BIT. APPLICATION TO FELT PENS IN PARTICULAR.

Description

The present invention relates to a mouthpiece for

pen.

  Ballpoint pens of the prior art consist of a brass tip of almost always conical shape which carries at its end a small ball of stainless steel; The tip is crossed by a plurality of small channels through which the ink reaches the small ball which, turning during writing, collects and distributes it

  on the paper At the back of this writing point

  re is connected a small tube also brass or a

  appropriate plastic material which contains the reserve of

cre.

  All of the above mentioned parties consis-

  title the part that is called in technical language

  i 15 "refill cartridge" The refill cartridge is

  introduced into a drum that can be indifferently

  of wood, metal or plastic.

  When these pens are to be made, the tip is first shaped in a cylindrical or conical shape and is obtained from a Brass Bar Detite, which point is then pierced to create the delivery channels.

  of ink, at this moment the small ball is applied.

  The tip thus prepared is united to the small tube

  which in turn is filled with ink The latter is normal

  an oily solution of dyes suitably thickened with resins, which should not contain suspended particles and which must be especially

  stable with regard to the dye.

  As an oily vehicle, oil is used

  vegetables (castor oil, etc.) fatty acids (a-

  oleic and ricinoleic acid, etc.), glycerin, etc. and as thickeners of natural and synthetic resins. Finally, it must be remembered that the ink must not flow from the metal point and must have a proper surface tension so that it evaporates in a few seconds.

  t There are also other types of pens called

  normally markers, by this term designating

  both the felt pencils themselves and the pencils-

  fibers. Felt pens include a plastic pen holder whose tip supports a thick wick (felt) that is used to write, This felt is extended

  inside the pen where it absorbs from a cartridge

che soaked ink to write.

  Writing more or less big depends on the

felt thickness.

  The pen holder is closed at its upper part by a plug and the tip is also closed and protected,

  when one does not use the pencil, by a hermetic cap

peak protection.

  The pencil-fiber, also called pointed pencil

  of nylon, basically has two inner parts

  res, namely: the pen or pen and the

see ink or stamp.

  The writing tip, formed of a beam of

  Nylon or acrylic fibers are obtained by a polymerization process. By this process, empty spaces are created between each individual fiber and those which are adjacent, through which the ink flows downwards uniformly, by capillarity. the technique of

  the formation of the pen provides, after the process of po-

  lymerization by which feathers of diameter four- to five-fold greater than that of use are produced, a next step in which, by the action of

  traction and removal, the feather is given its

  real terms of use; this for the sole purpose of

  -to achieve greater interdependence of said spaces

  empty and a greater number of ramifications.

  Depending on the type of tip, we distinguish between fine-writing pencils and drawing pencils Fine-writing pencils bear hard and compact tips,

  while those with drawings have soft spikes, gen-

  formed of bundles of polyester fibers treated

and polymerized.

  The tanks are small hollow cylinders

  polyvinyl chloride, preferably obtained by ex-

  trusion, filled with a bundle of acetate fibers

  lulose of varying density or polyester fiber, depending on

  whether the ink contains solvents or not Finally,

  are watery and contain additives

  improve the writing characteristics.

  'There is still one last type of pen today-

  on the market, this type comprising the assembly of a buffer or ink tank, a ball point and a

  capillary element (stick), of the polyes-

  ter, arranged between the buffer and the ball.

  È The operation of these pens, moreover iden -

  to the other pencils or pens so far men-

  except for traditional ballpoint pens

  is based on the principle of capillarity; The stick, in fact, having a significantly smaller diameter

  that of the buffer, by capillarity carries the ink close to

  of the ball which, by its rotation,

tribute on the writing paper.

-4 -

  However, although these pens bring together

  particular and specific characteristics

  of each of the pens mentioned above, they all-

  remarkable disadvantages Agglomerant which combines in a compact mass the fibers of the rod tends to reduce the intermediate voids necessary for capillarity and therefore, in order to restore the right flow of ink to the ball, it is necessary to However, this implies that the rod never comes into direct contact with the ball and that, therefore, with particular angular inclinations of the pen, the ink, of aqueous type, does not wet.

  The ball that can not write.

  Special means have been adopted to

  to overcome this disadvantage and thus allow a di-

  rect between the ball and the stick, such as for example the arrangement between the ball and the rod of specific elements cross or the like which however, because of their low capillarity, have not been able to

solve this problem.

  In addition these pens write properly only

  if the envelope containing the ball is made of steel;

  indeed, if it is of plastic material, what is

  very often, because of understandable work reasons, it is the outer edge of the envelope that writes

  and not the ball, resulting in burrs and writing.

ture qi is not very n

  The problem which is at the basis of the present

  The invention therefore is to use a tip for ballpoint pens which overcomes the disadvantages mentioned above, while at the same time allowing a clean, burr-free writing with any angular inclination.

of the writing tip.

  This problem is solved by the present invention.

  a ballpoint pen tip that is typical of

  in that it comprises a bushing, generally of

  a circular cross section of small diameter and, on the remaining part, a large diameter circular cross-section, in the area of section change

  creating an annular ring of abutment, with the-

  which engages one of the ends of a small tube of

  stainless steel, with a longitudinal through hole

  of small diameter, introduced, with tolerances of

  in said hole of circular cross-section

  re of large diameter, this small tube having its end

  opposite to that engaged with said annular ring

  wall, protruding forward of said bushing and further provided with a stainless steel ball disposed in a

  accommodation, by means of at least three long punchings

  longitudinal lines, corresponding to this second end of the small tube, a braid of textured polyester fiber threads being arranged inside this small tube and the hole of small diameter, this braid having one of its ends fixed in correspondence the end of the small tube provided with said at least three punchings

  longitudinal axis and its other end, brimming with

  the, embedded in an ink pad, of the type for example

  fiberglass or polyester fiber bundle, disposed behind said ferrule, said ferrule being further provided with an annular outer ring of abutment, arranged in correspondence of the end which

  carries the small steel tube, which, when the mouthpiece is

  -6- appeared in the outer casing (carcass) of the pen,

  abuts against the front part of the same carcass.

  Other characteristics and advantages

  more clearly from the detailed description of a

  a preferred but not exclusive embodiment of an end for ballpoint pens, hereinafter referred to

  in the annexed drawing, given by way of example only.

mitatif.

  Referring to the single figure, we have a global

  indicated in 1 a pen (partially illustrated) for-

  seen from the tip object of the present invention This tip

  consists of a socket 2, a small tube of stainless steel

  dable 3, also a steel ball 4 and a braid of textured polyester fiber yarns 5 (i.e.

made voluminous and elastic).

  i The socket 2 is provided with a through hole

  which, over a certain length, has a

  circular cross-section of small diameter 6 and on the remaining part has a circular cross-section

large diameter 7.

  In the zone of change of section there is thus the formation of an annular inner ring

  8, with which the end 3 a is engaged with

  tit tube 3 which is provided with a small passage hole

diameter 9.

  The small tube 3, which is introduced with

  force lances in the hole 7 of the sleeve 2, a

  its end 3b, opposite to the end 3a, which bu

  against the inner annular ring 8, protruding forward of the sleeve 2 In addition the end 3b carries the ball 4 which is housed with the possibility of rotation in a cell 10, obtained by means of at least three t -7 longitudinal punching> 11, formed behind the ball

4 on the small tube 3.

  The braiding of polyester fiber yarns 5, which extends inside the hole 9 of the small tube 3 and the hole 6 of the sleeve 2, has its end 5b stably fixed in correspondence with the zone of the small tube

  3 provided with the said punching 11.

  the direct and permanent contact of the points of the tres-

  of polyester fiber yarns 5 with ball 4.

  ; The opposite end 5a of the braid 5,

  of the sleeve 2, is embedded in an ink carrier 112 of the type, for example, with an acetate fiber bundle

  cellulose or polyester fibers, placed behind the

  end in a cylindrical housing 13 formed in the housing

  I loppe or carcass 14 of the pen 1.

  It should also be noted that bushing 2 is

  provided in correspondence of its end bearing the

  3, an outer annular ring 15 which, when the nozzle is assembled, abuts against the front surface 14 of the pregnant envelope 14 containing the

pen 1.

  In order to obtain an easy and secure assembly of the tip in the casing 14 of the pen 1 and to avoid any

  damage or folding-of the polyester fibers of the

  5a of the braid, the outer surface of the sleeve 2 has a conical development, as clearly visible in the figure, Due to the principle of capillarity on which is based the operation of these pens, the great advantage obtained by adopting this tip is due to the fact that the ink must pass through three stepped sections (buffer section, braided section in the hole 6, -8- braid section in correspondence of punching 11 of the small tube 3) before reaching the ball, this which gives rise to a remarkable increase in the capillarity of the whole; It follows that in this specific case the amount of ink that reaches the ball is much larger.

  only with the methods so far used.

  > It should not be forgotten that the extremes

  mites of the braids fixed in correspondence

  Punching of the small steel tube is always direc-

  in contact with the ball This always ensures, a-

  with any angular inclination of the tip to

  write, the flow of ink to the ball, which allows

  always put a clean and burr-free writing and, thing

  even more important, a homogeneous and continuous line.

  Of course, although the invention was described

  about a preferred embodiment, it is by no means limited-and changes may be

  brought to the end in question, without thereby becoming

  the basic principles of the invention itself, such as

  that they are set forth in the claims that follow.

AF.VNDTCATTONP

  1. Ballpoint pen tip characterized in that it comprises a bushing (2) generally made of plastic material, provided inside thereof with a longitudinal through hole which has, over a predetermined length, a circular cross section (6). of small diameter and, on the remaining part, a circular cross section (7) of large diameter in the zone of section change coming to form an annular ring of abutment (8), with which engages one (3 a ) ends of a small stainless steel tube (3), provided with a small diameter longitudinal through hole (9), introduced, with forcing tolerances, into said large diameter circular cross section hole, this small tube (3) having its end opposite to that engaged with said inner annular ring, protruding forward of said sleeve (2) and further provided with a ball (4) of stainless steel disposed in a housing (10). ), thanks to at least three longitudinal punchings (11), corresponding to this second end of the small tube, a braid of textured polyester fiber threads (5) being arranged inside this small tube (3) and the hole ( 9) of small diameter, this braid (5) having one (5b) of its ends fixed in correspondence of the end of the small tube provided with said at least three longitudinal punchings and its other end (Sa) overflowing the sleeve (2), embedded in an ink-carrying pad (12), of the type, for example, of cellulose acetate fiber bundle or polyester fibers, disposed behind said tip, this sleeve (2) being further provided with a crown annular outer ring (15) formed in correspondence of the end which carries the small steel tube, which, when the tip is assembled in the outer casing (14) of the pen abuts against the front part of the envelope (14). 2. Tip for ballpoint pens according to claim 1, characterized in that said sleeve (2) is provided with an outer surface conical development, a sharp change of conicity occurring in correspondence of a portion which corresponds roughly at the center line of the

same socket.