JP5509562B2 - Rotating and retracting writing instrument - Google Patents

Description

  The present invention is a rotary retractable writing instrument having a cam mechanism including a rotor and a cam cylinder, and the shaft cylinder is constituted by a front shaft and a rear shaft, and one of these shaft cylinders is the other shaft cylinder. The present invention relates to a rotary in / out type writing instrument that is covered with a brush.

As an example, the other end of the front shaft with respect to a front shaft or a connecting member fixedly attached to the front shaft having an opening at which the writing portion of the cursive body appears and disappears at the front end portion by the operation of the curving operation Rotating sliding-type writing instrument comprising a rear shaft fixedly attached in the axial direction by a suitable connecting means or a sliding member mounted integrally with the rear shaft so as to be rotatable. In the partial structure, there is a predetermined gap in the radial direction between the rear shaft or the sliding member attached integrally with the rear shaft and the connecting member fixedly attached to the front shaft or the front shaft. There is known a rotary feeding type writing instrument in which a sliding layer is formed with a grease layer formed by filling a highly viscous grease so as to be in contact with each other.
Patent No. 2700670

Conventionally, high-priced writing instruments use a metal material for a decorative ring that is integrally attached to the front shaft, the rear shaft, or the rear shaft, and give a high-class feeling due to its weight. The sliding member attached integrally with the front shaft is made of a metal material in consideration of strength and durability. In addition, the structure of the rotary sliding part of the high-priced rotary feeding type writing instrument is as described above as a means for smoothening the feeding operation and giving a predetermined sliding resistance to give a high-class feeling. Grease is interposed.
However, in the means for filling the gap with the grease, since the grease is fluid, the radial gap is not maintained constant, and as a result, the front shaft that is continuously provided in front of the grease filling portion. the axis and a rear axis eccentricity and / or inclination to the axis of, the by force, vibration and rattling has fallen occurred.
Here, the sliding portions may be brought into contact with each other without providing a gap, but not only the sliding resistance becomes large, but there is a risk that a metallic noise or the like is generated due to the contact. In particular, contact / sliding between metals tends to increase not only the sliding resistance, but also increase the metal sound.

The present invention is a rotary retractable writing instrument having a cam mechanism including a rotor having a cam groove and a cam cylinder, and the shaft cylinder includes a front shaft and a rear shaft, and any one of these shafts In the rotary projecting type writing instrument in which the cylinder is covered with the other shaft cylinder, one of the rotational sliding portions of the front shaft and the rear shaft is made of a metal material, and the other is made of a resin material. The rotary sliding part is point contact or intermittent line contact, and at least one member of the rotary sliding part is formed of a self-lubricating material, and the resin material is formed on a decorative ring . The gist is that the length of the resin material in the longitudinal direction is shorter than the length of the storage portion in the longitudinal direction.

The present invention is a rotary retractable writing instrument having a cam mechanism including a rotor having a cam groove and a cam cylinder, and the shaft cylinder includes a front shaft and a rear shaft, and any one of these shafts In the rotary projecting type writing instrument in which the cylinder is covered with the other shaft cylinder, one of the rotational sliding portions of the front shaft and the rear shaft is made of a metal material, and the other is made of a resin material. The rotary sliding part is point contact or intermittent line contact, and at least one member of the rotary sliding part is formed of a self-lubricating material, and the resin material is formed on a decorative ring . The length of the resin material in the longitudinal direction is shorter than the length in the longitudinal direction of the storage part, so there is no runout or rattling, and there is a suitable rotation resistance. An expression writing instrument can be provided.

Example 1
The rear shaft 1 is a cylindrical body made of a metal material, and a step portion 2 having a small diameter is formed on the rear side. On the upper surface of the stepped portion 2 (stepped portion upper surface 3), a stepped portion mounting hole 4 centering on the axis of the rear shaft 1 is opened. A head crown stopper 6 is inserted and attached to the stepped portion attachment hole 4. In the head crown stopper 6, a collar portion mounting surface 8 of the collar portion 7 abuts on the step bottom surface 5 of the step portion 2, and a head crown retaining screw portion 9 behind the head crown stopper 6 is a head of the head crown 11. It is fixed to the rear shaft 1 by screwing with the crown screw portion 12. Further, a clip 14 is disposed between the step 2 of the shaft 1 and the crown 11 so as to cover the step 2, and the clip 14 is attached to the collar portion of the crown stop 6. It is firmly fixed by being sandwiched between the face 8 and the crown surface 13 of the crown 11.
In this embodiment, a screwing structure is used as a fixing method of the head crown stopper 6 and the head crown 11. However, various fixing methods such as press-fitting, bonding, or a combination thereof may be used as appropriate.

A rotor 15 made of a resin material is attached to the head cap 6. More specifically, a mounting hole 16 is provided behind the rotor 15, and the knurled portion 10 provided in front of the head crown stopper 6 is press-fitted into the mounting hole 16. As a result, the rotor 15 is firmly fixed to the crown stopper 6. The rotor 15 is rotatably inserted into a cam cylinder 20 made of a resin material, but a slight rotation gap is provided between the cam cylinder 20 and the rotor 15 for smooth rotation. S is provided. In this embodiment, the rotation gap S is 0.05 mm.
A front end stopper 17 is formed in front of the rotor 15, and the front end stopper 17 engages with a storage hole 21 provided on the inner surface of the cam cylinder 20, thereby the rotor 15. Is prevented from falling off from the cam cylinder 20.
An intermediate pin 18 protrudes from the center of the rotor 15 and is rotatably fitted in a center hole 25 of a slider 24 made of a resin material. A split piece 27 is formed at the rear end portion of the slider 24 by providing a vertical split groove 26. By providing the longitudinal groove 26, it is possible to impart radial elasticity to the rear portion of the slider 24, and it is possible to press-fit the fitted middle pin 18 by the elasticity. A predetermined sliding resistance can be applied to the moving element 24.
In addition, a cam groove 19 is formed in front of the rotor 15, and an engaging projection 28 provided on the outer periphery of the slider 24 is engaged. Further, the engaging projection 28 is engaged with the longitudinal guide groove 22 provided in the cam cylinder 20, and the relative action between the slider 24 and the cam cylinder 20 is prevented by the engaging action. However, it can slide in the front-rear direction.

The refill 30 is biased rearward by the elastic force of the front spring 32, and the refill rear end face 31 is pressed against the slider front end face 29 of the slider 24.
A cam cylinder screw portion 23 is formed in front of the cam cylinder 20, and the cam cylinder screw portion 23 is screwed into a core screw portion 34 behind a metal core 33. A core press-fit portion 35 is formed in front of the core 33 and is press-fitted into a front shaft 37 made of a metal material, but is firmly fixed with an adhesive.
In this embodiment, as the method for fixing the core 33 and the front shaft 37, a press-fitting action and an adhesive are used in combination, but various fixing methods such as a combined use of a screwing structure and adhesion are used appropriately. Also good. Further, the screw structure of the cam cylinder screw 23 of the cam cylinder 20 and the core screw part 34 of the core 33 can be made detachable so that the refill 30 can be replaced. Yes.
With the configuration described above, when the front shaft 37 and the rear shaft 1 are relatively rotated, the cam cylinder 20 provided continuously with the front shaft 37 and the rotor provided continuous with the rear shaft 1. 15 is rotated relatively, and the slider 24 is advanced by the cam groove 19 of the rotor 15, and the refill 30 protrudes from the tip opening 38 of the front shaft 37. Further, the refill 30 is immersed by the urging force of the elastic member 32 by rotating in the direction opposite to the protrusion.

The decoration ring 39 is a cylindrical body made of a metal material, and a decoration ring press-fitting portion 40 is formed on the rear side. The decoration ring 39 is press-fitted and fixed to the rear shaft opening 46 of the rear shaft 1 together with an adhesive. In this embodiment, a press-fitting action and an adhesive are used in combination as a method for fixing the decorative ring 39 and the rear shaft 1. However, various fixing methods such as a combined use of a screwed structure and adhesion may be used as appropriate. good.
On the inner surface of the decorative ring 39, an enlarged storage portion 41 is formed, and an annular ring 44 made of a resin material is inserted and fitted into the storage portion 41. In addition, a retaining rib 42 is formed in front of the storage portion 41, and the inscribed circle diameter of the retaining rib 42 is smaller than the outer diameter of the ring 44. That is, the ring 44 is prevented from falling off from the front of the decorative ring 39 by the retaining rib 42.

In front of the inner surface of the ring 44, hemispherical ribs 45 are formed at equal intervals of 90 degrees at four locations on the circumference. Further, the distance between the opposing ribs 45, that is, the inscribed circle diameter of the rib 45, has a distance equivalent to the outer diameter of the core 33. Further, although the rib 45 is in point contact with the core 33 and the rib head portion T, it may be in surface contact with a fine area due to elastic deformation over time. That is, the contact portion between the rib head portion T and the outer periphery of the core 33 is a rotational sliding portion. Further, the ring 44 is brought into point contact with the core 33 by the rib head portion T, whereby the inner periphery of the decoration ring opening 43 of the decoration ring 39 made of metal and the attachment of the core 33 made of metal are attached. The core 33 is guided so as not to come into contact with the outer periphery of the flange portion 36.
In this embodiment, the ribs 45 are formed at equal intervals of 90 degrees at four locations. However, the number and arrangement interval of the ribs 45 are not limited to this, and the number and arrangement interval are determined by workability. Various combinations are preferably used in consideration of the accuracy of guidance and the like. Further, the shape of the rib 45 is not limited to a hemispherical cross section (see FIG. 4) in this embodiment. Various shapes are preferably used in consideration of releasability and the like. Even when a trapezoidal cross section is used, it is preferable to partially form a trapezoidal rib as in the previous example. That is, by forming partly, a gap is formed between the ribs, and the sliding resistance is reduced by the gap, and in the unlikely event that the top of the rib is deformed, the gap is deformed. It becomes the escape part of the part.

The resin ring 44 is formed of a self-lubricating material known for its low frictional resistance or a material containing a self-lubricating material. Known resin materials having self-lubricating properties include polyacetal, high-density polyethylene, tetrafluoroethylene resin, and nylon. Self-lubricating means include polypropylene, polyethylene, polycarbonate, acrylonitrile, butadiene, styrene resin, and other resin materials that do not have self-lubricating properties. A method of mixing and molding is known. The ring 44 can be obtained by molding the resin material self-lubricating material by cutting or injection molding. Incidentally, in this embodiment, polyacetal having good moldability and easy dimension management is selected, and the ring 44 is formed by injection molding.
Further, as a metal material having self-lubricating properties, a metal material and a solid lubricant powder are mixed and formed by means such as HIP (hot isostatic pressing), and the metal powder is known. There are powders such as iron, copper, brass, aluminum and titanium, and solid lubricant powders such as molybdenum disulfide MoS2, tungsten disulfide WS2, boron nitride BN, graphite, fluorinated graphite, lead oxide PbO, etc. And low melting point metals such as tin, polybutene, selenium, tellurium, bismuth, zinc and cadmium are known. Boron nitride BN can be used particularly suitably because of its low reactivity with metals and no decomposition at high temperatures of HIP treatment.
As described above, in this embodiment, the outer ring is formed of a self-lubricating resin material, and the inner core is formed of a metal material. However, the core is formed of a self-lubricating resin material. On the other hand, the ring located outside may be formed of a metal material. The ring made of the metal material may be a metal material having self-lubricating properties. That is, both the resin material and the metal material may be self-lubricating materials.

It is front sectional drawing of the Example of this invention plan. It is a disassembled perspective view of the cam cylinder, rotor, and slider of the Example of this invention plan. It is AA sectional drawing of FIG. It is a principal part enlarged view of FIG. It is a modification corresponding to FIG.

DESCRIPTION OF SYMBOLS 1 Rear shaft 2 Step part 3 Step part upper surface 4 Step part attachment hole 5 Step part bottom face 6 Head crown stopper 7 Head part 8 Head part attachment surface 9 Head crown set screw part 10 Knurl part 11 Head crown 12 Head crown screw part 13 Head Crown bottom surface 14 Clip 15 Rotor 16 Mounting hole 17 Tip stopper 18 Middle pin 19 Cam groove 20 Cam cylinder 21 Storage hole 22 Long longitudinal guide groove 23 Cam cylinder screw part 24 Slider 25 Center hole 26 Vertical split groove 27 Split piece 28 Engagement Joint protrusion 29 Slider front end face 30 Refill 31 Refill rear end face 32 Front spring 33 Core 34 Core screw part 35 Core press-fitting part 36 Mounting flange part 37 Front shaft 38 Tip opening part 39 Decoration ring 40 Decoration ring press-fitting part 41 Housing 42 Retaining rib 43 Decoration ring opening 44 Ring 45 Rib 46 Rear shaft opening S Turning gap T Rib head

Claims (3)

A rotary retractable writing instrument having a cam mechanism comprising a rotor having a cam groove and a cam cylinder, and the shaft cylinder is constituted by a front shaft and a rear shaft, and one of these shaft cylinders is the other In a rotary retractable writing instrument covered with a shaft cylinder, one of the front shaft and the rear shaft is made of a metal material, and the other is made of a resin material. Is a point contact or intermittent line contact, and at least one member of the rotating sliding part is formed of a self-lubricating material, and the resin material is formed in a decorative ring. A rotary retractable writing instrument in which the length of the resin material in the longitudinal direction is shorter than the length of the storage portion in the longitudinal direction while being inserted and fitted. 2. The rotary retractable type of claim 1, wherein the at least one member is formed of a resin material having self-lubricating property, the resin material is an annular ring member, and the ring member is fixed to the inner surface of the rear shaft. Writing instrument. 3. The ring member according to claim 2, wherein a plurality of hemispherical protrusions are radially formed on the inner surface of the ring member, the protrusions are brought into contact with the front shaft made of a metal material, and the contact part is used as the sliding part. A rotary writing tool.

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