Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
  • B43K—IMPLEMENTS FOR WRITING OR DRAWING
  • B43K1/00—Nibs; Writing-points
  • B43K1/003—Capillary nibs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
  • B43K—IMPLEMENTS FOR WRITING OR DRAWING
  • B43K8/00—Pens with writing-points other than nibs or balls
  • B43K8/003—Pen barrels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
  • B43K—IMPLEMENTS FOR WRITING OR DRAWING
  • B43K8/00—Pens with writing-points other than nibs or balls
  • B43K8/02—Pens with writing-points other than nibs or balls with writing-points comprising fibres, felt, or similar porous or capillary material
  • B43K8/026—Pens with writing-points other than nibs or balls with writing-points comprising fibres, felt, or similar porous or capillary material with writing-points comprising capillary material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
  • B43K—IMPLEMENTS FOR WRITING OR DRAWING
  • B43K8/00—Pens with writing-points other than nibs or balls
  • B43K8/02—Pens with writing-points other than nibs or balls with writing-points comprising fibres, felt, or similar porous or capillary material
  • B43K8/04—Arrangements for feeding ink to writing-points

Definitions

• the present invention relates to a writing instrument having a capillary writing tip, comprising: a shaft extending along a central axis and having a liquid reservoir compartment, - a tubular head located at the front of the barrel with a front part which has an opening opening of lower inner section to the inner section of the barrel, and having inner longitudinal ribs each having a vertex, the vertices being adapted to maintain a capillary connector extending from the writing tip to the compartment tank substantially along the central axis, these ribs extending rearwardly from the front opening of the head, an abutment member adapted to prevent axial displacement of the capillary connector rearwardly.
• a writing instrument of this type is known from US6474887 and is partially reproduced in Figures 7 and 8 attached.
• the instrument 100 comprises a barrel 110, a head 102, a capillary connector 103, and a reservoir compartment 105 into which is introduced a buffer 106 of fibrous material impregnated with liquid.
• a radial shoulder 131 of the writing tip abuts the forward end of the head 102 to prevent axial displacement of the connector 103 backward in the event of an impact on the tip, particularly if the front of the tip 'instrument 100 hits a surface quickly.
• Four inner longitudinal ribs 120 extend maintain the connector 103 allow an air passage between the front end of the head and the reservoir compartment 105.
• Such a writing instrument has various disadvantages.
• the radial shoulder 131 bears only on the front ends of the ribs 120.
• the bearing surface is relatively small and does not guarantee a good axial abutment of the tip if the tip undergoes a shock.
• the solutions of respectively increasing the diameter of this radial shoulder 131 and / or increasing the number of ribs 120 would have the disadvantage of reducing the cross-section passage of air between tip 103 and head 102.
• the object of the invention is to eliminate these drawbacks by proposing a writing instrument of the liquid applicator type which allows a firm hold in axial abutment of the writing tip in the event of impact or excessive pressure on this tip.
• the subject of the invention is a writing instrument of the liquid applicator type as defined in the introduction, characterized in that a ring substantially coaxial with the central axis and situated at a distance from the front opening of the head is integrally connected to the barrel by the longitudinal ribs and forms the abutment member cooperating with the capillary connector, these ribs extending radially between the ring and the barrel, and in that the barrel, the head, the ribs and the ring are made in one molded piece.
• the stop member By placing the stop member away from the front opening of the head, there is more space to form an air passage around this member.
• the stop member in the form of a ring allows the capillary connector to press axially on an extended solid surface.
• the one-piece construction avoids any risk of disassembly and therefore guarantees the strength of the stop member.
• such an embodiment in one piece has advantages in terms of simplicity of the manufacturing process which can represent a significant cost reduction for a production in very large series.
• the ring has a longitudinal front face inscribed in the section of the front opening of the head, and the radially inner wall of the head has a taper facing rearwardly.
• a first pin defines at least the opening of the head, the top portion of each rib, and the longitudinal front face of the ring, and may have the shape of a cylindrical bar of the same diameter as the outer diameter of the ring. Longitudinal grooves are then provided in the cylindrical wall of this pin to form the ribs.
• a second pin defines at least the inner wall of the barrel and most of the head, the base of the ribs, the rear longitudinal face of the ring, and preferably the outer radial wall of the ring.
• the inner radial wall of the ring can be defined by one or the other of the two pins. The fact that the radially inner wall of the head has a rearward taper makes it easier to remove the second pin.
• the ring is substantially circular and is coaxial with the central axis
• the outer radius of the ring is equal to the radius of the radially inner wall of the front part of the head, - the outer radius of the ring is between one-half and three-quarters of the inside radius of the barrel at the the ring,
• the longitudinal ribs are extended in the tank compartment by secondary ribs whose height is less than a quarter of the inner radius of the barrel, - the writing instrument has three longitudinal ribs distributed at 120 °.
• FIG. 1 schematically represents a partial view in longitudinal section of the front part of a d writing according to the invention.
• FIG. 2 schematically represents a cut-away perspective view of the part of the writing instrument shown in FIG. 1.
• FIG. 3 schematically represents a cross-sectional view of the writing instrument of FIG. 1 according to the plane. III-III.
• FIG. 4 schematically represents a cross-sectional view of the writing instrument of FIG. 1 along plane IV-IV.
• FIG. 5 schematically represents a cross-sectional view of the writing instrument of FIG. 1 along the V-V plane.
• Figure 6 shows schematically a cross-sectional view of the writing instrument of Figure 1 along the plane Vl-Vl.
• FIGs 7 and 8 schematically show a writing instrument known from US Patent 6,474,887.
• FIG. 1 shows the same part of the writing instrument and are described together.
• the writing instrument 1 comprises a drum 10 and a head 2 made in one molded piece.
• the barrel 10 comprises a reservoir compartment 5 which contains an ink or an eraser liquid.
• the ink is for example retained by capillarity in a buffer 6.
• the writing tip of the instrument is constituted by the front end of a substantially cylindrical capillary connector 3 which is held along the central axis A by means of longitudinal ribs 20 molded in the head 2. It is understood that the connector 3 could be formed by several capillary pieces placed end to end.
• the ribs 20 allow an air passage between the front end of the head 2 and the reservoir compartment 5, and extend rearwardly from the front opening of the head 2.
• Most of the connector 3 consists of a substantially cylindrical main portion 30, this main portion having a diameter slightly greater than the diameter of a rear portion 32 of the connector 3 so as to create a radial shoulder 31 remote from the tip of the connector. writing.
• Each rib 20 preferably has at its front end a flared shape to facilitate the introduction of the connector 3 during assembly.
• a ring 4 has an inside diameter which corresponds to the diameter of the rear portion 32 of the connector to surround with contact a portion of this rear portion 32 and form a stop member cooperating with the connector. The radial shoulder 31 of the connector can thus axially support an extended solid surface.
• the ribs 20 solidly connect the barrel 10 to the ring 4 extending radially between the ring and the barrel. Furthermore, these ribs 20 extend longitudinally up to the level of the rear longitudinal face of the ring, and it is possible to extend longitudinally rearward a relatively low height of each rib to form secondary ribs as explained ci -after.
• the ring 4, the ribs 20, the head 2 and the barrel 10 are made in one molded piece.
• the mounting of the writing instrument essentially consists in installing the connector 3 in the head of the writing instrument and in introducing the ink pad 6 into the rear opening of the drum, not shown.
• the longitudinal ribs 20 may be extended in this compartment by secondary ribs 21 whose height e is less than a quarter of the inner radius of the barrel. It can be expected that this height e decreases progressively rearwardly over all or part of the length of the secondary ribs 21.
• Another advantage of these secondary ribs 21 is to allow stall the ink pad 6 in the tank compartment 5 while leaving a certain air passage between the buffer and the inner wall of the barrel, which prevents an air depression that would impede the flow of ink from the buffer to the connector is created at the rear of the tank compartment 5.
• the head 2 has a substantially tubular front portion 2A provided to receive a cap.
• the empty space between the connector 3 and the inner wall of the head 2 becomes larger, as can be seen in FIG. 3 compared with FIG. empty compartment 7 open at its two axial ends is thus created between each pair of ribs 20, and three empty compartments 7 are distributed around the main portion 30 of the connector 3.
• the radially inner wall of the head 2 at each compartment 7 has a conicity oriented rearward, so that it does not form against undercut for demolding.
• the ring 4 has a longitudinal front face 4A inscribed in the section of the front opening. of the head.
• the outer radius R4 of the ring is equal to the inner radius of the front portion 2A of the head. This allows a sufficiently thick ring for the strength of the stop member, with a smaller diameter sufficient to not compromise the passage section of the ink by the rear portion 32 of the connector. Moreover, because of its radial thickness, the ring 4 contributes to the maintenance of the fibrous material of the buffer 6 in the reservoir compartment 5 and avoids to a certain extent that part of this fibrous material moves forward and enters the compartments 7 if the instrument 1 hits a surface, which is advantageous compared to the known device of FIG. 7.
• FIG. 4 The cross-sectional view of FIG. 4 along the plane IV-IV of FIG. 1 illustrates an advantageous embodiment in which the outer radius R4 of the ring 4 is between half and three quarters of the inner radius R1 of the barrel 10 measured at the level of the ring.
• This choice is advantageous for reconciling both a satisfactory maintenance of the buffer 6 in the event of impact and a sufficient air passage section between the compartments 7 and the reservoir compartment 5.
• This radius R4 is also equal to the inner radius of the front portion 2A of the head as shown in Figure 6.
• FIG. 5 illustrates the fact that the height e of the secondary ribs 21 is less than a quarter of the inside radius of the drum, to leave a sufficient air passage between the buffer and the inner wall of the drum without, however, excessively reducing the diameter of the buffer relative to the inside diameter of the barrel.
• each longitudinal rib 20 is relatively small relative to the radius R4 of the main portion 30 of the connector, and the thickness a rib is also relatively weak.
• the height and thickness dimensions of a rib are provided to ensure a sufficient air passage section in the front portion 2A of the head without compromising the stiffness of the ribs for a firm radial retention of the connector.

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• Pens And Brushes (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=37594920

Family Applications (1)

Country Status (8)

Families Citing this family (4)

Family Cites Families (9)

• 2006
  • 2006-05-12 FR FR0604265A patent/FR2900868B1/fr active Active
• 2007
  • 2007-05-11 CA CA002652004A patent/CA2652004A1/fr not_active Abandoned
  • 2007-05-11 EP EP07766031A patent/EP2024191B1/de active Active
  • 2007-05-11 BR BRPI0711603-9A patent/BRPI0711603B1/pt active IP Right Grant
  • 2007-05-11 MX MX2008014487A patent/MX2008014487A/es active IP Right Grant
  • 2007-05-11 WO PCT/FR2007/051253 patent/WO2007132115A2/fr active Application Filing
  • 2007-05-11 AT AT07766031T patent/ATE546298T1/de active
  • 2007-05-11 US US12/300,582 patent/US8177448B2/en active Active

Non-Patent Citations (1)

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