JP5142391B2 - Writing instrument cap - Google Patents

Description

  The present invention relates to a writing instrument cap, and more particularly to a writing instrument cap in which an interior cap is arranged in an exterior cap for maintaining an airtight state inside the cap when the cap is mounted on a writing instrument body.

  Conventionally, caps for fountain pens such as fountain pens that use water-based inks are installed inside the exterior cap so that the ink can be attached to the fountain pen in an airtight state in order to prevent the ink from evaporating from the pen tip and drying and solidifying Many writing instrument caps with caps have been proposed.

  By the way, in the cap attached to the fountain pen body, when the cap is removed, the space volume in the cap increases by the volume part of the front barrel with the pen tip of the fountain pen body pulled out from the cap. Therefore, the ink contained in the fountain pen body is drawn out from the nib and flows into the interior cap, and the pen tip and front shaft cylinder of the fountain pen body as well as the interior cap are soiled with ink and used. In some cases, a finger touches the front shaft cylinder that is soiled with ink and the finger is soiled with ink, or the ink accumulated on the pen tip drops on the paper surface and stains the paper surface with ink.

  In order to solve these problems, in the writing instrument cap, the interior cap with a vent hole at the tip can be moved inside the exterior cap by urging the interior cap backward by a spring placed in the exterior cap. The packing member that can close the vent hole is arranged in the exterior cap, and when the writing instrument cap is mounted on the writing instrument body, the inner cap moves forward and the vent hole is blocked by the packing member. A writing instrument cap having a structure in which the inner cap is retracted when the writing instrument main body is detached to close the ventilation hole of the packing member and the ventilation hole is opened, is disclosed in Japanese Utility Model Publication No. 59-5587, No. -120087 and Japanese Patent Application Laid-Open No. 2007-144907.

Wherein in the real Sho 59-5587 JP technique disclosed, urging force in the backward for interior cap ₂₆₁ when detached from the barrel 40 ₁ of the cap is retracted, the mounting cap to the barrel 40 ₁ It is dependent on the elastic force due to the compression of the packing 20 ₁ at the time of death. Generally, as disclosed in Japanese Utility Model Laid-Open No. 4-120087, Japanese Patent Application Laid-Open No. 2007-144907, etc., the biasing force to the rear of the interior cap uses a spring means, and the spring is used. When is in that it does not it is advantageous to reduce and become the manufacturing cost of the parts, the resilient force packing 20 ₁ is or degraded been contaminated by natural deterioration and ink is lowered, the interior cap 26 ₁ retraction is not performed smoothly, the space volume of the interior cap ₂₆₁ is increased becomes depressurized, ink there is a possibility that flows out to drawn out from the pen tip within the interior cap _261, released from the barrel cap The inventors of the present invention have found that a spring-based structure is better for the rearward biasing force for the interior cap to retreat.

By the way, in the conventional structure as described above, in the exterior cap provided at the front end of the spring or the interior cap for applying a rearward biasing force for the interior cap to retreat when the cap is detached from the writing instrument body. The packing member that opens and closes the communicating hole is generally provided in a space portion in front of the interior cap. In other words, it is necessary to provide such a space, the shaft diameter becomes thick at the tip of the cap, the outer diameter of the writing tool cap into which the writing instrument body is inserted, and the tip side where the packing member is arranged There is a problem that the shape of the outer diameter is not so different and the design is restricted.
Japanese Utility Model Publication No.59-5587 Japanese Utility Model Publication No. 4-120087 JP 2007-144907 A

  The present invention provides a case where a writing instrument cap in which an inner cap provided with a vent hole at the tip is urged rearward by a spring and mounted so as to be movable is attached to or removed from the writing instrument body. In a writing instrument cap that has a structure in which the interior cap moves back and forth and the ventilation hole is closed or opened by the packing member disposed in the exterior cap, the interior cap moves smoothly back and forth with respect to the exterior cap, and the passage provided in the interior cap Proposes a structure that can securely close or release the pores with the packing member arranged in the exterior cap, and can reduce the outer diameter around the tip side portion of the writing instrument cap with the packing member arranged It is. In other words, even in a writing instrument cap whose tip side portion is tapered, a writing instrument in which an interior cap provided with a vent hole in the tip is urged backward by a spring and is movably mounted in the exterior cap. When the cap is attached to or removed from the writing instrument main body, the inner cap moves back and forth, and the air hole is closed or opened by the packing member arranged in the outer cap. It is what.

The present invention
"1. When a writing instrument cap that is movably attached to the exterior cap by urging the interior cap with a vent hole at the front end by a spring is attached to the writing instrument body or removed from the writing instrument body, A cap for a writing instrument having a structure in which an interior cap moves back and forth, and a ventilation hole is closed or opened by a packing member disposed in the exterior cap, and the packing member is formed in an inner cylindrical shape having at least one end opened. The other end is fixed to the exterior cap or a member mounted in the exterior cap or is fixed to the front end of the interior cap in a sealed state, and a spring for urging the interior cap rearward is provided inside the packing member. One end of the packing member is placed at the tip of the interior cap or inside the exterior cap or the exterior cap by the back and forth movement of the interior cap. Contact with or spaced a writing instrument cap comprising a member mounted.
2. 2. The writing instrument cap according to claim 1, wherein one end portion of the packing member is provided as an expanded portion having an outer diameter and an inner diameter expanded outward. "
It is.

  In the present invention, in order to fix the other end of the packing member to the exterior cap or a member mounted in the exterior cap in a sealed state, for example, in the shape where the other end of the packing member is closed, the other end A recess is formed on the inner wall surface of the outer cap that fixes the end portion or on the outer wall surface of the member mounted in the outer cap, or on the inner wall surface of the outer cap or on the outer wall surface of the member mounted in the outer cap. Forming a recess, forming a recess into which the other end closed by the projection can be fitted, and fixing the other end into the recess and adhering with an adhesive. However, the structure in which the protrusions are provided to form the recesses has a problem in that the total axial length of the cap becomes long, and the total axial length of the shaft cylinder and the total axial length of the cap Considering the balance, it is not so preferable.

  In addition, even if the other end of the packing member is open, the method for fixing the other end to the exterior cap or the member mounted in the exterior cap is the same as described above, and a recess is formed in the other end. However, the end surface of the other end is in close contact with the bottom surface of the recess, or the outer surface of the packing member and the inner surface of the recess are in close contact with each other and adhered with an adhesive or the like. It needs to be airtight.

  In the present invention, the other end of the packing member may be fixed to the tip of the interior cap. In that case, a concave groove is formed in the front end portion of the interior cap so that the air hole is present, or a protruding portion protruding forward in the axial direction is formed to provide the concave groove, and the other side of the packing member is provided. The end portion is fixed by being closely fitted into the groove and adhered.

  In the present invention, in order to fix one end of the spring that urges the interior cap rearward to the distal end portion of the interior cap, a projection is formed so that a vent hole is present in the distal end portion of the interior cap, and the projection is There are a method of fitting to the inner diameter of the spring, a method of forming a recess communicating with the vent hole at the tip of the interior cap, and inserting and fixing the spring so that the outer diameter of the spring is pressed against the recess. There is no particular limitation. .

  In the present invention, the spring force is used to urge the interior cap backward, so that when the interior cap is detached from the writing instrument body, the interior cap is smoothly retracted with respect to the exterior cap, The vent hole closed by the member can be opened reliably, and therefore, the ink does not enter the pen tip because the space volume in the interior cap does not increase when the interior cap is detached from the writing instrument body. It is not drawn out and flows into the interior cap, and the writing instrument body is not stained with ink or the fingers are stained with the discharged ink. Moreover, since the spring is arranged inside the packing member, it is not necessary to make the space volume in the outer cap necessary for arranging the packing member and the spring larger than that of the conventional structure, and the tip of the outer cap The outer diameter around the part can be reduced.

  With the invention according to claim 2, the expanding portion expands outwardly to the tip of the interior cap that contacts one end of the packing member or the exterior cap or the member mounted in the exterior cap. Since it contacts, the contacted part will be in a close contact state reliably. In addition, even if the packing member is deteriorated and the elastic force is slightly reduced, there is also an advantage that the expanded portion can be expanded and contacted to the outside and can maintain a close state. Furthermore, when one end abuts, one end does not deform inward, so it abuts against the spring for biasing the interior cap backward, and the spring is attached to the rear. Since the force is not hindered, the inner cap can be always retracted smoothly with respect to the outer cap when the inner cap is detached from the writing instrument body.

  In the present invention, a spring for urging the interior cap rearward is inserted and disposed inside a packing member for closing a vent hole provided at the tip of the interior cap.

  Embodiments of the present invention will be described with reference to the drawings. Although this embodiment will be described as a writing instrument cap in a fountain pen, the present invention is not limited to a fountain pen cap. When the same member and the same part are shown, the same code | symbol is attached | subjected.

  1 to 3 show a fountain pen cap 1 according to a first embodiment of the present invention. The metal exterior cap 2 has a tapered shape at the front end side (left side in FIG. 1), has a collar portion 3 projecting inward at the front end, and a ring shape on the inner wall surface of the opened rear end portion 2b. The concave groove 4 is provided. The resin-made interior cap 5 is formed in a cylindrical shape having a tapered shape with a closed front end portion 5a and an open rear end portion 5b. A plurality of locking projections 6 arranged in a circumferential shape are provided on the outer peripheral surface of the rear end portion 5b of the inner cap facing the concave groove 4 of the outer cap 2. The interior cap 5 is inserted into the exterior cap 2 and the locking projection 6 is retained in the concave groove 4 so that the interior cap 5 does not leave the exterior cap 2 and moves forward (leftward in FIG. 1). It is inserted so that it can move. The concave groove 4 is provided longer than the width in the axial direction of the locking projection 6 in the axial direction, and the inner cap 5 is inserted into the outer cap 2 so as to be movable forward (to the left in the figure). A gap is formed between the exterior cap 2 and the interior cap 5, and the front space portion 7 of the interior cap 5 is between the clearance between the exterior cap 2 and the interior cap 5 and the locking projection 6. It communicates with the outside through the gap.

  A connecting screw member 8 composed of a main body portion 8a and an abutting portion 8b having an outer diameter larger than that of the main body portion 8a is connected to the distal end portion 2a of the outer cap 2, and the abutting portion 8b is connected to the outer cap 2 of the outer cap 2. The main body 8 a is in contact with the flange 3 and is mounted so as to protrude forward from the locking hole 9 provided at the tip of the exterior cap 2. The main body portion 8a is formed with an engaging recess 10 opened forward (left side in FIG. 1), and a male screw portion 11 is provided on the outer periphery of the main body portion 8a.

  In the inside of the crown tube 14 having the clip 12 formed integrally and having the conical recess 13 at the tip, it is U-shaped, and the male screw part of the connecting screw member 8 is connected to the male screw part 11 on the inner peripheral surface. A head screw 20a and a screw part 20b are formed in a through-hole 19 penetrating an inside formed in the hollow part 13 with a screw member 18 having a female screw part 15 that can be screw-fitted and having a hole 17 in the bottom part 16. The male screw portion 20b of the head screw 20 constituted by the above is inserted from the recess 13 side, the screw portion 20b is inserted into the hole 17 of the connected screw member 18, and the connected screw member 18 is interposed inside the head screw. The nut 21 is fixed in the crown tube 14 by screwing the nut 21. A concave portion 20c is formed in the head 20a of the head screw 20, and a head crown ornament 22 is bonded to the concave portion 20c. (See Figure 2)

  The crown tube 14 is connected to the distal end of the exterior cap 2 by screwing the female screw portion 15 of the connected screw member 18 into the male screw portion 11 of the connecting screw member 8.

   A part of the rear end of the screw part 20b of the head screw 20 and the head screw nut 21 is inserted into the engaging recess 10 formed at the front end of the main body part 8a of the connecting screw member 8, so The total length in the direction of the heart is not increased. A coil spring recess 24 is provided behind the engagement recess 10 of the main body 8 a via a partition wall 23. A packing recess 25 having a large inner diameter is formed behind the coil spring recess 24. A fitting protrusion 26 protruding inward in a ring shape is provided on the inner peripheral surface of the packing recess 25, and a ring-like fitting groove formed on the outer periphery corresponding to the fitting protrusion 26. A cylindrical packing member 28 having a widened portion 29 having an outer diameter and an inner diameter that are widened in a trumpet shape at one end 28a that is open on the rear side (interior cap side). The packing member 28 is fixed to the connecting screw member 8 by fitting the portion 26 into the fitting concave groove 27.

  As described above, the interior cap 5 is inserted into the exterior cap 2 so as to be able to move forward (to the left in the figure) with respect to the exterior cap 2. A penetrating vent hole 30 is provided. Further, the tip 5a is provided with a coil spring fitting recess 31 that communicates with the vent hole 30 and is larger than the inner diameter of the vent hole 30, and one end of the coil spring 32 is inserted into the coil spring fitting recess 31 in a press-fit state. It is fixed. The coil spring 32 is loosely fitted inside the packing member 28, and the other end is in contact with the partition wall 23 that forms the bottom 24 a of the coil spring recess 24 of the connecting screw member 8.

  As shown in FIG. 3, when the writing instrument cap 1 is attached to a fountain pen body 103 having a cylindrical pen 102 integrally formed at the tip of a metal front shaft cylinder 101, the interior cap 5 is pressed against the front cylinder 101. Then, the expanded portion 29 of the packing member 28 fixed to the connecting screw member 8 comes into contact with the front end portion 5 a of the interior cap 5. Thereby, the space formed by the inside of the packing member 28, the packing recess 25 of the connecting screw member 8, the coil spring recess 24, the coil spring fitting recess 31 formed in the front end portion 5 a of the interior cap 5, and the vent hole 30. Part: A and the space part: B excluding the front shaft cylinder 101 in the interior cap 5 are in a sealed state.

    FIG. 4 shows the cap 41 of the second embodiment. In the packing member 28 of the first embodiment, the packing member 42 of the present embodiment has the same structure as that of the first embodiment except that the shape has a bottom portion 43. The other end of the coil spring 32, which is inserted and fixed in a press-fitted state in the coil spring fitting recess 31 provided, is in contact with the bottom 43 of the packing member.

  Although not shown, when the writing instrument cap 41 of this embodiment is attached to the fountain pen body as in the first embodiment, the interior cap 5 is pushed forward by the front barrel and fixed to the connecting screw member 8. The expanded portion 44 of the packing member 42 is in contact with the front end portion 5 a of the interior cap 5, and is formed by the coil spring fitting recess 31 and the vent hole 30 formed inside the packing member 42 and the front end portion 5 a of the interior cap 5. The space portion of the interior cap 5 excluding the front shaft cylinder is sealed.

  FIG. 5 shows a cap 51 according to a third embodiment of the present invention. Similar to the connection screw member 8 in the first embodiment, the connection screw member 52 screw-fitted to the connected screw member 17 is similar to the connection screw member 8 in the first embodiment. The contact portion 52b has an outer diameter larger than that of the main body portion 52a. The main body 52a and the contact portion 52b are provided with a coil spring recess 53 similar to that of the first embodiment, and no packing recess is provided unlike the connecting screw member 8 of the first embodiment.

  A vent hole 30 is provided in the front end portion 5a of the interior cap 5 that is formed in the same manner as the interior cap 5 in the first embodiment and arranged in the same manner as in the first embodiment. A coil spring fitting recess 32 having a diameter larger than the inner diameter of the vent hole 30 is provided in front of the coil hole, and one end of the coil spring 32 is inserted into the coil spring fitting recess 31 in a press-fit state and fixed. is there. The other end of the coil spring 32 is a partition wall between the engagement recess 54 provided in front of the main body 52a (left side in FIG. 1) and the coil spring recess 53, which is the bottom of the coil spring recess 53 of the connecting screw member 52. 54 abuts.

  A ring-shaped packing groove 56 is formed outside the coil spring fitting recess 31 provided at the tip 5a, and one open end 57a on the front side (left side in FIG. 4) is a trumpet shape. A cylindrical packing member 57 having an expanded portion 58 having an outer diameter and an inner diameter expanded to the other end portion 57b of the packing member 57 is inserted into the packing concave groove 56 and bonded and fixed. It is. The coil spring 32 is positioned inside the packing member 57.

  Although not shown, when the writing instrument cap 51 is attached to the front barrel of the fountain pen body, as in the first embodiment, the interior cap 5 is pushed forward by the front barrel and attached to the interior cap 5. The expanded portion 58 of the packing member 57 is in contact with the rear end surface 59 of the connection screw member 52, and the coil spring is formed in the packing member 57 and in the coil spring recess 53 of the connection screw member 52 and the front end portion 5a of the interior cap 5. The space part formed by the fitting recess 31 and the vent hole 30 and the space part of the interior cap 5 excluding the front barrel are sealed.

  The present invention is applicable to a writing instrument cap in which an interior cap having a vent hole is arranged in an exterior cap, and the vent hole is closed and opened by a packing member by attaching / detaching the interior cap to / from the shaft cylinder. It is.

It is an end elevation of the side of a cap showing the 1st example concerning the present invention. It is an enlarged view of the principal part in FIG. In FIG. 1, it is the figure which used the part of the side surface which shows the state which mounted | wore the fountain pen main body to the cap. It is an end elevation of the side of a cap showing the 2nd example concerning the present invention. It is an end elevation of the side of a cap showing the 3rd example concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 41, 51 Writing instrument cap 2 Exterior cap 5 Interior cap 8, 52 Connecting screw member 24 Coil spring recess 24a Bottom 28, 42, 57 Packing member 29, 44, 58 Expanded portion 30 Vent hole 32 Coil spring

Claims (2)

  When the writing instrument cap is attached to the writing instrument body or detached from the writing instrument body, the inner cap is attached to the writing instrument body. A writing instrument cap having a structure that moves back and forth and closes or opens a vent hole by a packing member disposed in an outer cap, wherein the packing member is formed in an inner cylindrical shape having at least one end opened. The end of the outer cap is fixed to the outer cap or a member mounted in the outer cap or is fixed to the tip of the inner cap in a sealed state, and a spring that biases the inner cap rearward is inserted into the packing member. One end of the packing member is attached to the front end of the interior cap or the exterior cap or the exterior cap by the back and forth movement of the interior cap Contact with or spaced a writing instrument cap comprising a member.   2. The writing instrument cap according to claim 1, wherein one end of the packing member is provided as an expanded portion having an outer diameter and an inner diameter expanded outward.

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