FR2487181A1 - COSMETIC PENCIL - Google Patents

Abstract

THE INVENTION RELATES TO A PENCIL, IN PARTICULAR TO A PENCIL FOR COSMETIC USE, IN WHICH THE MINE 3 OF THE PENCIL IS PRODUCED BY CASTING OF THE MATERIAL OF THE MINE IN CAVITY 2 OF THE PENCIL 1 OF THE PENCIL. IN ORDER TO AVOID THAT, DURING THE CASTING, AN INCLUSION OF AIR BETWEEN THE CASTING MOLD AND THE MINE, IN THE REGION WHERE THE PENCIL TIP COMES OUT OF THE PENCIL, THE CAVITY OF THIS BARREL LEAKS INTO THE MINE POINT 3 REGION, TOWARDS THIS POINT.

Description

The invention relates to a pencil for cosmetic use comprising a lead

held inside

  the cavity of a pencil barrel made of a material

  Before being cut into a point (machinable by removing chips), the lead being firmly surrounded by this fnt and being obtained by casting the lead mass in the

  cavity by forming a point of free lead. Such a cra-

  yon is also described in the deomrande d (le) patent (Jo la

  Federal Republic of Germany DijOS 27 18 957.

  1 (In the manufacture of the known pencil, it can sometimes form during the casting of air inclusions between the tip of the mine and the casting mold at the junction between the barrel of the pencil and the tip of the mine, this due to the blunt shape

  from the front end (frustoconical) of the fnt. These include

  damage the appearance of the tip surface

  mine and, therefore, to the appearance of the whole cra-

  yon. If, in order to avoid these air inclusions,

  knows the wall at the front end of the barrel so that it

  hold a sharp edge but keeping the already known shape of the barrel cavity, which is cylindrical from one end to the other, we would obtain a significant thinning of the material at the front end of the f t. The fnt would

  then very subject to mechanical stresses at its

  moth before and could easily burst or break.

  The invention aims to improve the pencil of the

  genre cited at the beginning of this memoir thanks to a

  more rational figuration in the region of the point of the pencil, so as to remove the difficulties which one experienced to give a correct configuration to this point. For this, according to the invention, at its end closest to the free point of the mine, the cavity of the barrel which receives the mass of the mine flares in the direction directed towards this end. In this way, the radial width of the front surface of the front end of the f t is greatly reduced or, in a form

24 8 7181

  preferred embodiment of the invention, in the case of a sharp-edged configuration of the extr4r: ity before the barrel, this radial width is entirely canceled and the causes of the formation of air inclusions between the i: asse casting. fluffing the tip of the mine and the mold

thus removed.

  The invention advantageously finds applica-

  tion in cases where the outer surface of the end

  front of the fit has a conical outline. Thanks to the eva-

  At the end of the ftt cavity, the internal surface of the fat which forms the recess of the evasion can join

  the outer (conical) surface so that at the rear

  where the two surfaces meet, a much larger angle is formed than in the case where the internal surface of the front end is cylindrical in shape as in the rest of the cavity. The enlargement of the angle gives; galew. Have a greater solidity to

1 'e'x'. Front mound of the rft.

  The configuration given according to the invention at the front end of the fat and the configuration of the tip of the mine, which adapts obligatorily; ent to that of the end of the fot, also lead to a more

  high degree of demouldability of the pencil after coating

  mine line. i, effect, where r: ine emerges

  of f t and where its external surface presents a discontinuity

  tee (an edge) the flaring of the internal surface of the fot makes it possible to form a much greater angle than in the case of the manufacture of the known pencil, where the coating by the mass dc of the mine of the frontal surface whose

  presence is due to the frustoconical configuration of the ex-

  front trity of the fft gives rise to a shoulder (at right angles) in the region of the tip of the mine

  Thanks to this larger angle, the tip of the mine pre-

  feels greater mechanical resistance at said point of discontinuity, so that the risk of cracking or tearing of the mine occurs there at the time of

  The unwinding of the pencil is at least greatly reduced. Follow-

  in front of another prfr.ee characteristic of the invention, which acts in the sound mr.no, the flaring of the cavity of the fMt which is provided at the end before this flt has a trumpet-shaped sound so that the transition between the cylindrical region and the flared region of the cavity is progressive. for the rest, it is possible to apply in the present invention all the characteristics of the

  of the patent application of the Federal Republic of Germany-

  i.agne D -CS 27 59 610, provided they are compatible

  with the invention. This observation is valid, for example-

  solid, also for the configuration of a sphere cap at the tip of the mine, as well as for materials that can be machined by removing shavings (which can be cut into a point), for example wood or plastic,

whose ffit ebt úait.

  Others, features and benefits of the in-

  vention will be better understood on reading the description

  tion which will follow from a realization and in, su

  '-, from the Arnloeé drawing which represents the pencil in color.

longitudinal eg.

  The minine 3 is poured into the cavity 2 of the f't 1 by forming a free free tip 3 'which is.

  its e-xtl.'itè of an arxrondi 311 in the shape of a sphere cap-

  2. re. The cavity; or, more precisely, the wall (of this cavity is terl: ine in the region of the front end of the

  ftt by a flare; :: have a trumpet (a flare progresses-

  sif). The internal surface of the fft which forms this king-size flare against the surface: dull conical 1 'of 1 tranity

  ) before the ft at the level of the edge 4. The angle formed at the

  calf c1e art 4 by surfaces 1 'and 2 "is manifested

  grow larger than the cylindrical wall of the cavity

  te 2 extended to the outside before the fat. The drawing, on which the region of the pencil configuration which is of interest to the invention is embossed by a corcle in mixed lines, again shows the perforated annulus, i tendroit oi la!., Ine emer-, e de 1 the length of the front of the CNT (at the point of discontinuity) is clearly greater than 900 and, consequently, greater LCand clue if it forms a 6) also on the external surface of the mine at the level of front end due to configuration

  frustoconical, so that the angle would only be cde c00.

  J the rear end, the FO.t 1 has a section ex-

  reduced reduction for per, -: be the reassembly of a cap

enveloping and decorative.

  5-ien entenldu, di-rerses rodifications could be brought -.r the holmme of art to the device which comes cdlttr'c (.icrijt only: slow to ti; re of e. Example not

  limiting without cola going beyond the scope of the invention.

R V EI N DI C A T IO N S

  1 - Pencil, in particular for cosmetic use, comprising a lead held inside the cavity of a pencil fit made of a material that can be sharpened (machinable by removal of shavings), the lead being formally surrounded by this fCt and being obtained by casting the lead mass in the cavity by forming a free point, this pencil being characterized in that, in its extreme region closest to the free point (3 ') of the mine, the cavity ( 2) fCt (1)

  flares towards this point.

  2 - Pencil according to claim 1, charac-

  terized in that the flare (2) has a trumpet shape.

  3 - Pencil according to one of claims

  1 and 2, characterized in that the external surface (1 ')

  of the front end of the fQt is conical.

  4 - Pencil according to any one of the res-

  dications 1 to 3, characterized in that the external surface (1 ') and the flared internal surface (2') of the end

  before the flt meet in an clay (4).

  - Pencil according to any one of claims 1 to 4, characterized in that the end of the tip (3 ') of the mine, which preferably has a

  conical shape, is rounded with a cap shape.