JP2005088319A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing utensil, in the tail crown of which no crack develops due to the change of environmental conditions and consequently the tail crown can be surely held under the condition that the tail crown to be mounted to the barrel of a writing utensil main body, the outer tube of a cap or the tail end opening of the barrel or of the outer tube is made of natural material such as ivory or wood. <P>SOLUTION: The tail crown is pinchingly held through cushioning materials 5 by a holding member 4 arranged within the barrel 1 or the outer tube 2 formed of ivory, wood or the like and at the same time, a clearance for absorbing the radial deformation of the barrel or of the outer tube is formed between the barrel and the holding member or between the outer tube and the holding member. The tail crown 3 is pinchingly held through the cushioning materials by a pinching member 6 and a clearance is provided between the outer peripheral surface of the tail crown and the pinching member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a writing instrument in which a shaft cylinder, an outer cylinder of a cap, and the like are formed of a natural material such as wood or ivory.

  Writing instruments are products in which design elements such as appearance shape and material texture are regarded as important in addition to the original writing function. In particular, the fountain pen is sometimes emphasized in luxury, but as one of the methods to emphasize the luxury, the shaft cylinder of the writing instrument body and the outer cylinder of the cap, which are usually formed of plastic or stainless steel, are used as wood or Sometimes molded from natural materials such as ivory. Further, when the outer cylinder of the shaft cylinder or the cap is formed from a natural material such as wood or ivory, the tail cap attached to the tail end opening of the shaft cylinder or the outer cylinder may be formed from the same natural material. In particular, if these members are molded with expensive ivory, the writing instrument can be given a very high-class feeling.

  Shaft cylinders and outer cylinders made of plastic or stainless steel, which are industrial products, do not deform very much due to environmental changes, but natural materials such as wood and ivory may deform greatly when environmental conditions such as temperature and humidity change. There is. In the case of a ivory molded into a cylindrical shape, the amount of deformation in the longitudinal direction is not very large. However, for example, in the case of a cylindrical body having an outer diameter of φ15 mm, when the environmental conditions such as temperature and humidity change, the radial direction becomes 0. 0 mm. It was found that the film contracted by about 3 to 0.4 mm.

Since ivory and wood are more fragile than plastic and stainless steel, a screw tube is directly formed in the shaft tube or outer tube made of ivory or wood and screwed into another member or fixed to another member by press-fitting. It is difficult. Therefore, in many cases, a holding member formed into a cylindrical shape with a metal plate is disposed in a shaft cylinder or an outer cylinder, and the shaft cylinder or the outer cylinder is held by this holding member and fixed to another member. At this time, in order to increase the internal volume, the cylindrical fixing member is disposed in contact with the inner peripheral surface of the shaft cylinder or the outer cylinder. Therefore, when the shaft tube or the outer tube contracts in the radial direction due to a change in environmental conditions, the holding member is strongly pressed to receive a large stress. In addition, although the amount of deformation in the longitudinal direction is small, if both end edges of the shaft tube and the outer tube are clamped and held by the holding member, a large stress is applied when deformed in the longitudinal direction. If left in this state, cracks may occur in ivory and wood during drying.
The situation is the same when the tail cap formed of ivory or wood is attached to the tail end opening of the outer tube of the shaft tube or cap.

  Therefore, the present invention is based on a change in environmental conditions when the outer cylinder of the writing instrument body, the outer cylinder of the cap, or the tail cap attached to the tail end opening of the axial cylinder or the outer cylinder is molded from a natural material such as ivory or wood. An object of the present invention is to provide a writing instrument that can be reliably held without cracks.

  In order to achieve this object, the invention of claim 1 is a writing instrument in which the shaft cylinder of the writing instrument body and / or the outer cylinder of the cap is formed of a natural material such as wood or ivory. A cylindrical holding member having clamping parts at both ends is arranged inside, and both end edges of the shaft cylinder or / and the outer cylinder are clamped and held by the clamping parts via a cushion material, and the shaft cylinder or / and outside A gap is formed between the inner peripheral surface of the cylinder and the outer peripheral surface of the holding member to absorb the radial deformation of the shaft cylinder and / or the outer cylinder.

    The invention of claim 2 is a writing instrument in which a tail crown formed of a natural material such as wood or ivory is attached to a tail end opening of a shaft cylinder of a writing instrument body and / or an outer cylinder of a cap. Is held by a pinching member via a cushion material, and a gap for absorbing the radial deformation of the tail crown is formed between the outer peripheral surface of the tail crown and the inner peripheral surface of the pinching member.

  Since both end edges of the shaft cylinder and / or outer cylinder are held by the clamping portion via the cushion material, the deformation amount can be absorbed by the cushion material even if it is deformed in the longitudinal direction. Alternatively, a gap is formed between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the holding member so as to absorb the amount of deformation in the radial direction of the shaft cylinder or / and the outer cylinder. Since it does not press strongly and is not subjected to stress, the occurrence of cracks can be prevented and it can be reliably held. Further, the situation is the same in the case of the tail cap attached to the tail end opening of the shaft tube or the outer tube, so that cracks do not occur and can be reliably held.

  Cracks may occur due to changes in environmental conditions when the barrel of the writing instrument, the outer cylinder of the cap, and the tail cap attached to the tail end opening of the barrel or outer cylinder are molded from natural materials such as ivory or wood. The purpose of providing a writing instrument that can be securely held is held by a holding member disposed inside the shaft tube or the outer tube with a cushioning material, and the inner periphery of the shaft tube or the outer tube. A gap is formed between the surface and the outer peripheral surface of the holding member to absorb the amount of deformation in the radial direction of the shaft tube, the outer tube, and the tail crown, and the peripheral portion of the tail crown is sandwiched by a pinching member via a cushioning material. This was realized by holding the pressure and forming the same gap between the outer peripheral surface of the tail crown and the pinching member.

  FIG. 1 shows an example in which the shaft cylinder of the main body of the fountain pen and the tail cap attached to the tail end opening of the shaft cylinder are formed of ivory, but the members with extremely small width are omitted from the oblique lines indicating the sectional view. In FIG. 1, the holding member 4 is arrange | positioned inside the axial cylinder 1 shape | molded by the ivory at the cylinder shape. The holding member 4 is screwed to the flange portion 42 by a tube portion 41, a flange portion 42 connected to the tail end side of the tube portion 41, and a bolt 49, and a tail end-side clamping portion 45 is integrally formed. The distal end member 43 is connected to the distal end side of the cylindrical portion 41, and includes a distal end member 44 to which a tip 7 having a pen tip 71 and a pen core 72 is attached, and a pinching portion 46 on the distal end side.

Next, the assembly method will be described. The tail end edge of the shaft tube 1 is covered with the pinching portion 45 on the tail end side via the cushion material 5, while the tip end edge of the shaft tube 1 is also interposed via the cushion material 5. The pinching part 46 on the tip side is covered. Then, when the tube portion 41 having the tail end member 43 and the tip member 44 connected to both ends is inserted into the shaft tube 1 and the tail end member 43 and the flange portion 42 are connected by the bolt 49, the exposed portion 44a of the tip member 44 is obtained. Presses the pinching portion 46 on the distal end side, and the axial cylinder 1 is pinched and held by the pinching portion 45 on the tail end side and the pinching portion 46 on the distal end side by the pressing force and the reaction force. That is, the shaft cylinder 1 formed of ivory is held by the holding member 4 via the cushion material 5. Here, a gap of about 0.5 mm is formed between the inner peripheral surface of the shaft cylinder 1 and the outer peripheral surface of the cylindrical portion 41 of the holding member 4. The dimension of the gap is a dimension that does not press strongly against the holding member 4 even when the shaft cylinder 1 contracts in the radial direction due to a change in environmental conditions or the like.
When the shaft cylinder 1 is held by the holding member 4, the tip 7 is attached to the exposed portion 44 a of the tip member 44. Thereby, the axial cylinder 1 and the tip 7 are connected.

  The tail crown 3 formed of ivory is also held by the clamping member 6 including the outer clamping member 61 and the inner clamping member 62. That is, an inner clamping member 62 is integrally provided on the tail end side pressing portion 45, and the tail crown 3 is placed on the tail end pressing portion 45 through the cushion material 5. When the outer pinching member 61 is screwed into the inner pinching member 62, the peripheral edge of the tail crown 3 is pinched and held by the pinching member 6. The tail crown 3 has a gap of about 0.5 mm between the inner peripheral surfaces of the cushions. The size of the gap is also a size that does not press strongly against the pinching member 6 even if the tail crown 3 contracts in the radial direction due to changes in environmental conditions.

  In this manner, the shaft cylinder 1 and the tail crown 3 are nipped and held via the cushion material 5, and the inner peripheral surface thereof is provided with a gap between the holding member 4 and the nipping member 6. Even if the shaft tube 1 or the tail cap 3 is deformed in the hand direction, the amount of deformation can be absorbed by the cushion material, and the holding member 4 or the pinch can be sandwiched when the environmental condition is changed and deformed in the radial direction. Since it does not press strongly against the pressure member 6 and is not subjected to stress, the occurrence of cracks can be prevented, and the pressure member 6 can be held by the holding member 4 or the pinching member 6.

  FIG. 2 shows an example in which the outer shaft of the fountain pen cap and the tail cap attached to the tail end opening of the outer shaft are formed of ivory. In FIG. 2, the holding member 4 is arrange | positioned inside the outer cylinder 2 shape | molded by ivory. The holding member 4 includes a tail end member 43 in which a collar portion 41a on the tail end side and an abutment portion 41b on the tip end side are integrated, and a tail end member 43 in which the pinching portion 45 on the tail end side is integrated, and a pinch on the tip end side. It consists of a pressure part 46, and the collar part 41 a and the tail end member 43 are connected by a bolt 49.

  Next, the assembly method will be described. The tail end edge of the outer cylinder 2 is covered with the pinching portion 45 on the tail end side via the cushion material 5, while the tip edge of the outer cylinder 2 is also interposed via the cushion material 5. The pinching part 46 on the tip side is covered. Then, when the tube portion 41 is inserted into the outer tube 2 and the tail end member 43 and the flange portion 41a of the tube portion 41 are connected by the bolt 49, the joint portion 41b is connected to the front-end side pinching portion 46 via the decorative ring 8. The outer cylinder 2 is pinched and held by the pinching portion 45 on the tail end side and the pinching portion 46 on the tip end side by the pressing force and the reaction force. That is, the outer cylinder 2 formed of ivory is held by the holding member 4 via the cushion material 5. Here, a gap of about 0.5 mm is formed between the inner peripheral surface of the outer cylinder 2 and the outer peripheral surface of the cylindrical portion 41 of the holding member 4 as in the case of FIG. The dimension of the gap is a dimension that does not press strongly against the holding member 4 even when the shaft cylinder 1 contracts in the radial direction due to a change in environmental conditions or the like. And the inner cylinder 9 is arrange | positioned in the cylinder part 41. FIG. In addition, a tail cap 3 made of ivory is attached to the tail end opening of the outer cylinder 2, but the attachment structure is the same as the example shown in FIG.

  As described above, the outer cylinder 2 is sandwiched and held via the cushion material 5 and the inner peripheral surface is provided with a gap between the holding member 4 and the outer cylinder 2 is deformed in the hand direction. Also, the amount of deformation can be absorbed by the cushion material 5, and when the environmental condition changes, the holding member 4 is not pressed strongly when deformed in the radial direction, and cracks are not generated because it is not stressed. While being able to prevent, the outer cylinder 2 can be reliably hold | maintained by the holding member 4. FIG.

1 is a cross-sectional view of Example 1. FIG. 6 is a cross-sectional view of Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Outer cylinder 3 Tail crown 4 Holding member 45 Clamping part on the tail end side 46 Clamping part on the tip side 5 Cushion material 6 Clamping member 7 Front end 8 Decoration ring 9 Inner cylinder

Claims (2)

In a writing instrument in which the shaft cylinder of the writing instrument body and / or the outer cylinder of the cap is formed of a natural material such as wood or ivory,
A cylindrical holding member having clamping parts at both ends is arranged inside the shaft cylinder and / or outer cylinder, and both end edges of the shaft cylinder and / or outer cylinder are clamped by the clamping parts via a cushioning material. A gap is formed between the inner peripheral surface of the shaft cylinder and / or the outer cylinder and the outer peripheral surface of the holding member so as to absorb the amount of deformation in the radial direction of the shaft cylinder or / and the outer cylinder. Writing instrument to do. In a writing instrument in which a tail crown formed of a natural material such as wood or ivory is attached to the tail end opening of the outer cylinder of the writing instrument body or / and the cap,
The clearance between the outer peripheral surface of the tail crown and the inner peripheral surface of the pinching member is absorbed between the outer peripheral surface of the tail crown and the peripheral portion of the surface of the tail crown. Writing instrument characterized by the fact that is formed.

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