JP2007030279A - Structure for fitting knock to holder tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for fitting a knock to a holder tube which enables reliable fitting of the knock to the holder tube without causing a crack, plastic deformation or others in the knock. <P>SOLUTION: In this structure, the knock is fitted to the holder tube so that it is movable back and forth, while an elastically deformable engaging pawl for preventing falling-off from the holder tube is formed in the knock. On the other hand, a receiving part to be engaged with the engaging pawl is formed in the holder tube and an engaging part is formed in the knock, while an engagement receiving part to be engaged with the engaging part is formed in the holder tube. The engaging part and the engagement receiving part are so provided that they are not rotatable, but movable back and forth. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure for attaching a knock to a shaft cylinder.

As an example, “a sheath tube provided with a cam groove having a cam surface on the inner wall surface, a pressing member provided with a cam portion at the end on the writing body side and a pressing portion at the other end, and a cam portion of the pressing member. A rotating cam member that moves through the cam groove of the sheath cylinder by a pressing operation to the joint pushing member and engages / disengages with the cam surface, and is urged by the resilient member toward the opening of the rear end of the sheath cylinder and contacts the rotating cam member. In the writing body projecting and retracting mechanism composed of the cursive body in contact with the pressing member, the outer diameter of the cam member and the pressing portion is smaller than the inner diameter of the rear end opening of the sheath and the outer diameter of the cam portion Further, the outer diameter of the pressing part is formed to be larger, and the outer peripheral surface between the cam part and the pressing part is provided with a locking projection part that gives a resilient force in the radial direction. The pressing part is opened at the rear end of the sheath cylinder so that the member engages with the longitudinal groove extending in the longitudinal direction with the locking projection formed in the sheath cylinder and is movable in the long groove. Cursive infested mechanism is protruded outwardly from part characterized by being disposed within the sheath tube. "Is known. In other words, by forming the locking protrusion of the push member so as to be deformable in the radial direction, when the push member is assembled to the sheath tube, the locking protrusion can be deformed in the radial direction and inserted. Yes.
No. 7-53993.

The above prior art has the advantage that the outer diameter of the knock pressing portion can be increased because the knock can be inserted from the rear end opening of the sheath tube.
In recent years, it has been desired to produce a high-class feeling from a design point of view while being inexpensive, and the knock is formed of a resin material and is formed on the surface of the resinous knock. Gold, silver, chrome, etc. have been applied.
However, the plating treatment increases the rigidity of the locking protrusion formed on the knock as well as the knock itself, and as a result, the locking protrusion is less likely to elastically deform in the radial direction. It has become difficult to insert it into the sheath. Here, if the position of the locking projection and the long groove are not aligned, the locking protrusion is deformed during the alignment, and the locking projection There was a risk that cracks would occur in the protrusions or plastic deformation would occur, resulting in defective sliding.
Here, there is a method in which the part where the knock is inserted into the sheath and the pressing part are divided into two parts, and both are fixed by means such as screwing, but the number of parts increases and the assembly process also increases. So it is not realistic. Although it is conceivable to reduce the height of the locking projection of the knock and reduce the amount of elastic deformation in the radial direction of the locking projection, it is possible to prevent plastic deformation of the knock as much as possible. The locking projections are likely to be detached from the long groove in the rotational direction, and as a result, the knock is likely to fall off the sheath tube.

  The present invention is a structure for attaching a knock to a shaft cylinder, wherein the knock is attached to the shaft cylinder so as to be movable back and forth, and an elastically deformable locking claw that prevents the knock from dropping off from the shaft cylinder is formed. On the other hand, the shaft tube is formed with a receiving portion that engages with the engaging claw, and the knock tube is formed with an engaging portion, and the shaft tube is engaged with the engaging portion. The gist is that the engaging portion and the engagement receiving portion are provided so as to be capable of moving back and forth although they are not rotatable.

  The present invention relates to a structure for attaching a knock to a shaft cylinder, wherein the knock is attached to the shaft cylinder so as to be movable back and forth, and an elastically deformable locking claw that prevents the knock from falling off the shaft cylinder is formed. On the other hand, the shaft tube is formed with a receiving portion that engages with the engaging claw, and the knock tube is formed with an engaging portion, and the shaft tube is engaged with the engaging portion. Since the engagement part and the engagement receiving part are provided so as to be able to move back and forth while being non-rotatable, the knock is securely attached to the shaft cylinder without causing a crack or plastic deformation in the knock. Can do. Therefore, the secondary effect that the falling off the shaft cylinder can be prevented even when the height of the locking claw is formed low is also generated.

An embodiment of the present invention will be described in detail with reference to FIGS. The shaft cylinder 1 includes a front shaft 2 and a rear shaft 3, and the front shaft 2 and the rear shaft 3 are detachably fixed by means such as screwing. A grip member 4 made of a rubber-like elastic body or the like is mounted on the surface of the front shaft 2 to improve the anti-slip effect and reduce fatigue during writing. An anti-slip effect may be provided by forming fine irregularities.
The crown 5 is attached and fixed to the rear portion of the rear shaft 3 by means such as concave / convex fitting (fitting between an engagement hole 3a and an engagement 18a, which will be described later). 3 is exposed from the rear end. The crown 5 will be described in detail. A cylindrical portion 6 that fits into the rear shaft 3 is formed in the front portion of the crown 5 made of a translucent resin molded product, and the rear end portion has a larger diameter than the cylindrical portion 6. Although the collar part 7 which has is formed, the collar part 7 is formed in the state inclined toward one side part. The cylindrical portion 6 on the lower side of the flange portion 7 is formed with a fixing portion 8 protruding therefrom, and the fixing portion 8 has a groove portion 9 toward the longitudinal direction of the cylindrical portion 6. Are formed, but a minute protrusion 10 is formed on the bottom of the groove 9. Further, a decorative piece 11 is formed on the lower side of the flange 7 along the inclination of the flange 7 in a curved state, and is formed on the lower surface near the end of the decorative piece 11. A locking projection 12 is formed. A locking claw 13 projecting forward is formed at an end of the locking projection 12, and the locking projection 12 having an elliptical shape that is long in the lateral direction. However, it may be a perfect circle or a polygon such as a quadrangle or a pentagon.
Reference numerals 14 to 17 denote protrusions (reference numeral 17 is a protrusion on the opposite side to the protrusion 16) that prevents the head crown 5 from swinging and rattling when the crown 5 is attached to the rear shaft 3. , And 18 is an engagement protrusion that engages with the engagement hole 3a of the rear shaft 3 of the head crown 5 and prevents it from subsequently coming off from the shaft 3. It is inclined toward the inner diameter direction. In addition to being easy to mount on the rear shaft 3, the structure is difficult to come off after mounting.

  A through hole 19 is formed on the side surface of the intermediate portion of the head crown 5 at a position facing it. Further, an inner flange portion 20 is formed in an intermediate portion of the inner surface of the crown 5 and in contact with the upper end of the through-hole 19, and a notch portion (engagement receiving portion) is formed in a part of the inner flange portion 20. Part) 21 is formed. Further, a deep groove portion 22 and a shallow groove portion 23 are formed in front of the flange portion 20, and a rear end portion of the deep groove portion 22 reaches the inner surface flange portion 20.

A knock 24 is arranged on the crown 5 so as to be movable back and forth. The knock 24 will be described. A reduced diameter portion 25 is formed in front of the knock 24, and a projection (engaging portion) 26 that engages with the notch portion 21 formed in the crown 5 and moves back and forth at an intermediate portion thereof. Is formed. Further, the reduced diameter portion 25 is formed by notching it in a U-shape and is formed with a locking piece 27 that can be deformed in the radial direction at a facing position. A locking claw 28 protruding outward is formed at the rear portion of the locking piece 27. And this latching nail | claw 28 fits in the through-hole 19 formed in the said head crown 5, and can move back and forth now. Furthermore, a mountain-shaped inclined surface 29 is formed on the circumference of the front end surface of the reduced diameter portion 25.
A rotor 30 is disposed inside the head crown 5 and in front of the knock 24 so as to be movable back and forth and to be rotatable. A plurality of protrusions 31 are formed on the outer periphery of the rotor 30, and an inclined surface 32 is formed at the rear end of the protrusion 31. And the protrusion 31 is engaged so that the shallow groove part 22 currently formed in the crown 5 can move back and forth. On the other hand, the inclined surface 32 formed at the rear end portion of the protrusion 31 is in contact with the mountain-shaped inclined surface 29 formed in the knock 24. That is, when the knock 24 is pressed, the rotor 30 moving forward also follows and moves forward. In this example, a cam mechanism called a debit cam mechanism is configured by adopting the above-described configuration.

  A ballpoint refill 33 is disposed in the shaft cylinder 1 so as to be movable back and forth. An elastic member 34 made of a coil spring or the like is disposed in front of the ballpoint pen refill 33, and urges the ballpoint pen refill 33 rearward. The ballpoint pen refill 33 contains oil-based or water-based ink 35, and a backflow preventive agent 36 such as silicone grease and a backflow preventive agent 36 are embedded in the back of the ink 35 from a resin material. The float 37 is located, but this is not always necessary depending on the viscosity of the ink 35 used. The rear end portion 38 of the ballpoint pen refill 33 is in contact with the front end portion of the rotor 30. In other words, the ballpoint pen refill 33 is a retractable writing instrument that protrudes and retracts from the tip opening of the barrel 1 by the pressing operation of the knock 24.

Next, the clip main body 39 attached to the head crown 5 will be described. The clip body 39 is formed of a curved metal material, but may be formed of a resin molded product in the same manner as the head crown 5. An upright piece 40 is formed on the rear side surface of the clip main body 39, and an inclined portion 41 along the inclined surface of the flange portion 7 is formed at the rear end portion of the upright piece 40. Further, the standing piece 40 is formed with an engagement piece bent inwardly, and is fitted into a groove portion 9 formed in the fixing portion 8 of the crown 5.
Further, a through hole 42 is formed in front of the clip main body 39 into which the locking projection 12 of the decorative piece 11 formed integrally with the crown 5 is loosely inserted. Further, the length of the through hole 42 in the width (lateral) direction is substantially the same as the length of the locking projection 12 in the width direction, but the length of the through hole 42 in the vertical direction, that is, the clip body. The length of 39 in the longitudinal direction is longer than the length of the locking projection 12 in the vertical direction, but is shorter than the length of the locking claw 13. That is, the locking projection 12 can move back and forth with respect to the longitudinal direction of the through hole 42. In the state where the clip body 39 is assembled to the crown 5, a gap is formed in front of the through hole 42, that is, in front of the locking projection 12. Reference numeral 43 denotes a ball portion formed inside the vicinity of the front end of the clip body 19, but it may be formed of a separate member from the clip body and fixed to the clip body by means such as press fitting. In the present example, the decorative piece 11 has a thin plate shape, but may have a three-dimensional shape. Furthermore, when the decorative piece 11 is formed of a transparent material, the shape of the through hole 42 of the clip body 39 may be a star shape or a shape imitating a flower that is interesting, As described above, a gap is formed between the locking projection 12 and the through hole 42.

  Next, the operation will be described. When the knock 24 is assembled to the crown 5, first, the protrusion 26 of the knock 24 engages with the notch 21 of the flange 20. At this time, the positioning of the knock 24 with respect to the crown 5 is completed. Next, when the knock 24 is further pushed into the crown 5, the locking piece 27 is deformed in the inner diameter direction so as to get over the inner flange 20, and the locking claw 28 fits into the through-hole 19 at the moment when the locking piece 27 gets over. At the same time, the inward deformation of the locking piece 27 is restored, and the locking claw 28 engages with the through hole 19.

  A second example will be described with reference to FIGS. This is an example in which an engaging portion 45 is formed at an intermediate portion of the knock 44 and a sliding groove 46 is formed to engage with the engaging protrusion along the longitudinal direction of the inner surface of the crown 5. Of course, the engaging projection 45 and the sliding groove 46 are relatively non-rotatable but can be moved back and forth.

The external view which shows the 1st example of this invention. The longitudinal cross-sectional view of FIG. XX sectional drawing of FIG. The YY sectional view taken on the line of FIG. The principal part disassembled external view of FIG. FIG. 6 is an exploded cross-sectional view of a main part of FIG. 5. The principal part longitudinal cross-sectional view which shows a 2nd example. ZZ sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Front shaft 3 Rear shaft 4 Grip member 5 Head crown 6 Cylindrical part 7 Gutter part 8 Fixing part 9 Groove part 10 Smile protrusion 11 Decoration piece 12 Locking protrusion 13 Locking claw 14 Projection 15 Projection 16 Projection 17 Projection 18 Engaging projection 19 Through hole 20 Inner flange 21 Notch portion 22 Deep groove portion 23 Shallow groove portion 24 Knock 25 Reduced diameter portion 26 Projection 27 Locking piece 28 Locking claw 29 Inclined surface 30 Rotor 31 Protrusion 32 Inclined surface 33 Ballpoint pen refill 34 Ejection member 35 Ink 36 Backflow preventive agent 37 Float 38 Rear end portion 39 Clip body 40 Standing piece 41 Inclined portion 42 Through hole 43 Ball portion 44 Knock 45 Engagement portion 46 Sliding groove

Claims (3)

A structure for attaching the knock to the shaft cylinder, wherein the knock is attached to the shaft cylinder so as to be movable back and forth, and an elastically deformable locking claw that prevents the knock from falling off the shaft cylinder is formed, The shaft tube is formed with a receiving portion that engages with the engaging claw, the knock is formed with an engaging portion, and the shaft tube is formed with an engaging receiving portion that engages with the engaging portion. The structure for attaching the knock to the shaft cylinder is characterized in that the engagement portion and the engagement receiving portion are provided so as to be able to move back and forth although they cannot rotate. 2. The structure for attaching a knock to a barrel according to claim 1, wherein the surface of the knock is plated. The structure for attaching the knock to the shaft cylinder according to claim 1 or 2, wherein the knock is a part of a cam mechanism.