JP5330862B2 - Thin writing instrument - Google Patents

Description

  The present invention relates to a thin writing instrument.

  Conventionally, there has been known a thin writing instrument in which the cross-sectional shape of the main body is formed in a substantially flat shape whose thickness direction is thin with respect to the width direction (see, for example, Patent Document 1), but when manufacturing such a thin writing instrument, There were various problems in structure. For example, as shown in FIG. 5 (A), if the thickness of the main body 32 is increased in order to increase the weight and strength of the thin writing instrument 31, there is a problem that sinks or warpage occurs due to the characteristics of the resin at the time of manufacture, and the molding is performed correctly. There were many things that could not be done (for example, FIG. 5B). If the thickness of the main body 33 is made thin as a whole so as not to cause such a defect (for example, FIG. 5C), sufficient strength cannot be obtained, and as shown in FIG. If a separate reinforcing member 34 is incorporated in the interior of the housing, the number of parts increases, which cannot be obtained economically.

Japanese Utility Model Publication No. 6-64967 (FIG. 1)

  The problem to be solved by the present invention is a thin writing instrument in which the main body is formed in a thin and substantially flat shape. To provide a thin writing instrument that can be obtained economically with a small number of parts.

According to the present invention, in a thin writing instrument comprising a main body that is formed in a substantially flat shape with a thin thickness direction with respect to the width direction and extends in the longitudinal direction, the main body has a main body base portion extending from the front end to the rear end, and the main body base. An outer layer portion formed by two-color molding or insert molding on the outer periphery of the portion, the main body base portion opening at the front end of the main body and extending rearward, and a housing portion for storing the refill and the main body and projecting in the width direction is ridge extending in the longitudinal direction is formed, the outer layer is provided with a flat-screen writing instrument, characterized by coating the outer projecting strip portion, the problems are solved.

  The present invention provides a thin writing instrument having a main body that is configured as described above and that is formed in a substantially flat shape with a thin thickness direction with respect to the width direction and that extends in the longitudinal direction. The main body base extends from the front end to the rear end. And an outer layer portion formed by two-color molding or insert molding on the outer periphery of the main body base portion, and a housing portion in which the refill is accommodated in the main body base portion, opening at the front end of the main body and extending rearward And a protrusion extending in the width direction of the main body and extending in the longitudinal direction, and the protrusion is covered with the outer layer part, so that the wall thickness of the main body is the same between the protrusion part and the outer layer part. Since the total thickness is obtained and the main body itself does not have to be formed thick, there is no risk of sink marks or warping during molding. In addition, by providing the protrusions along the longitudinal direction, the strength of the main body is increased, there is no risk of bending or bending at the time of writing, and it is not necessary to incorporate a separate reinforcing member, The number of parts is reduced, which can be obtained economically.

It is a top view which shows one Example of this invention. It is a side view. It is a longitudinal cross-sectional view and sectional drawing of each part of thickness direction. It is explanatory drawing which shows the state which moved the refill to the writing position. The main body of the conventional thin writing instrument is shown, (A) is sectional drawing of the design stage at the time of trying to provide a main body with thickness, (B) is sectional drawing at the time of manufacturing the structure of (A), (C) Is a cross-sectional view when the whole is thinly provided, and (D) is a cross-sectional view of a state in which a reinforcing member is incorporated in the thin main body.

  Although the present invention can be applied to a mechanical pencil and other various writing instruments, the drawing shows an embodiment applied to a knock-type ballpoint pen. 1 to 3, the main body 2 of the thin writing instrument 1 is formed in a substantially flat shape with a thickness T direction being thin with respect to the width W direction and extending in the longitudinal direction, and its cross-sectional shape is substantially oval. It is provided to become. The cross-sectional shape of the main body can be formed into a substantially oval shape, a substantially elliptical shape, a substantially rectangular shape, or other appropriate shape. The main body 2 is composed of a main body base portion 3 extending from the front end to the rear end, and an outer layer portion 4 formed on the outer periphery of the main body base portion 3 by two-color molding or insert molding.

  The main body base portion 3 is formed of a plastic material, and as shown in FIG. 3, the main body base portion 3 extends rearward from an opening 5 provided at the tip, and stores a ballpoint pen refill 6. It has the protrusion part 8 which protrudes and extends in a longitudinal direction. The protruding portion 8 can be provided over the entire length of the main body, but in the illustrated case, the protruding portion 8 is provided from the vicinity of the opening 5 of the storage portion 7 to slightly behind the intermediate portion, and the wall thickness thereof is 7 is formed to a thickness approximately the same as the thickness of the wall 9 that forms the wall 7. Further, the protruding portion is not provided in the rear portion from the middle portion of the main body base portion 3 and extends in the width direction, and a knock storage portion 11 for storing the knock member 12 is formed as will be described later. However, since this knock storage part 11 is provided as a void, there is no problem of sink or warp even if it is formed thick.

  As described above, the outer layer portion 4 is provided on the outer periphery of the main body base portion 3 by a known two-color molding or insert molding procedure. At this time, the storage portion 7 and the ridge portion 8 of the main body base portion 3 are provided. The entire circumference may be covered, but it is formed so as to cover at least the protrusion 8. The outer layer portion can be provided in various other modes. For example, as shown in the drawing, a window portion 10 is provided in the outer layer portion 4 so that a part of the main body base portion 3 can be visually recognized. The main body base portion 3 is projected so that the wall body 9 appears on the outer peripheral surface and the periphery thereof is surrounded by the outer layer portion 4, so that the main body base portion 3 is formed in substantially the same surface, or the main body base portion 3 is recessed and covered with the outer layer portion 4. If the outer layer part 4 and the main body base part 3 are formed of a resin having a different color or texture, or a resin having a different hardness, for example, the outer layer part is formed of a soft resin, a variety of changes can be obtained. can get.

  As described above, a knock storage portion 11 that communicates with the storage portion 7 and opens at the rear end is provided behind the main body base portion 3, and the ball pen refill 6 is operated in the knock storage portion 11. The knock member 12 to be stored is housed. A receiving hole 13 is formed at the rear end of the knock member 12, and a clip 14 is inserted and fixed.

  The ball pen refill feeding mechanism can have various configurations. In the embodiment shown in the figure, the rear end of the ball pen refill 6 is held by the knock member 12, and the The knock member 12 is urged rearward with a spring 15 interposed therebetween. A locking claw 17 is provided at the end of the elastic piece 16 formed on one side of the knock member 12, and the locking claw 17 is locked in the locking hole 18 or the locking hole 19 of the main body 2. Thus, the ball-point pen refill 6 can be held in the housed state (FIGS. 1 to 3) or the writing state (FIG. 4). In the written state, a substantially mountain-shaped protrusion 20 formed at the tip of the knock member 12 is fitted into a substantially mountain-shaped recess 21 formed at the rear end of the main body 2, whereby the ball-point pen fill The rear end of 6 can be stably held. The knocking member, the feeding mechanism, and the internal structure of the main body base portion that accommodates the knocking member and the feeding mechanism can have other appropriate configurations depending on the type of writing instrument.

  With the above configuration, even when the main body is formed thick, the main body is configured by the main body base portion and the outer layer portion, so there is no risk of sink marks or warping, and the main body can be used for writing. Since the base part is reinforced by the ridge part, it is rigid and does not bend, so it is easy to write and hard to break.

DESCRIPTION OF SYMBOLS 1 Thin writing instrument 2 Main body 3 Main body base part 4 Outer layer part 7 Storage part 8 Projection part 9 Wall body 12 Knock member W Width T Thickness

Claims (3)

In a thin writing instrument having a main body that is formed in a substantially flat shape with a thin thickness direction with respect to the width direction and that extends in the longitudinal direction, the main body has two colors on the main body base portion extending from the front end to the rear end and on the outer periphery of the main body base portion. It has an outer layer portion formed by molding or insert molding, and the main body base portion opens at the front end of the main body and extends rearward, and stores a refill and protrudes in the width direction of the main body and is long. ridge extending direction are formed, thin writing instrument, wherein said outer layer portion covering the outer side of the projecting strip portion.   The thin writing instrument according to claim 1, wherein a window portion is formed on the outer layer portion so that a part of the main body base portion can be visually recognized.   The thin writing instrument according to claim 1, wherein the outer layer portion surrounds the main body base portion that appears on the outer peripheral surface.

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