JP2000079789A - Knocking type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an engaging projection from being hooked by the folded- back part of the end edge of a body to be pinched when a writing utensil is drawn out of a pocket after being inserted in the pocket having a sewn folded part or the like. SOLUTION: This knocking type writing utensil has a clip safety mechanism. By means of the safety mechanism, when a knocking rod is pressingly operated, an engaging projection 51 at the outer surface of a shaft tube 2 is moved forward, resulting in engaging with the engaging step part 42 on the inner surface at the tip of a clip 4. On the other hand, when the clip 4 is lifted up, an engaging state is released, resulting in moving the engaging projection 51 backwards. At the rear of the engaging projection 51, a radially outward projecting guide projection 52 is provided. The guide projection 52, between which and the engaging projection 51 a certain fixed interval is kept, is made movable back and forth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a knock-type writing instrument. In detail, the pen tip of the refill is projected from the tip of the barrel by knocking operation, and even if the writing implement is inserted into a pocket etc. with the pen tip protruding, the engaged state is released and the pen tip is The present invention relates to a knock-type writing instrument provided with a clip safety mechanism for preventing the article from being immersed in the interior and soiling clothes and the like.

In the present invention, "front" refers to the pen tip side,
“Rear” refers to the knocking operation side.

[0003]

2. Description of the Related Art Conventionally, Japanese Utility Model Publication No. 63-31987 discloses a writing body (equivalent to a refill of the present application) having a pressing element at the rear end of a shaft cylinder and being inserted into the shaft cylinder so as to be able to move back and forth. Is provided at the tip of the clip in a knock-type writing instrument in which the pressing element is urged against the pressing element, and a hole is formed in the shaft cylinder at a position facing the locking hole. Characterized in that an engaging portion 2b '(corresponding to a locking projection of the present application) interlocked with the pressing element is projected from the hole to engage and disengage with the locking hole 4a of the clip. Body access device. " (See Fig. 9)

[0004]

The above-mentioned conventional writing implement is
As shown in FIG. 9, the engaging surface of the locking projection 2b 'has a vertical surface shape (or hook shape) so as to securely engage with the locking step portion 4a of the clip. For this reason, after being inserted into the sewn clamped body 9 (for example, a cloth pocket such as clothes, or a leather insertion ring such as a binder notebook),
When the writing instrument is pulled out of the clamped body 9, the locking projection is easily hooked on the folded portion 91 (a sewn portion) at the edge of the clamped body 9, thereby possibly damaging the folded portion 91.

The present invention has been made to solve the above-mentioned conventional problems. When the writing instrument is pulled out of the clamped object after the clamp is inserted into a clamped object having a folded back portion, such as clothing.
The locking projection does not catch on the folded part (sewn point) of the edge of the held object, so it can be pulled out smoothly,
As a result, an object of the present invention is to provide a knock-type writing instrument in which damage to a held object is avoided.

[0006]

Means for Solving the Problems The present invention provides a locking projection that projects radially outward from the outer surface of a shaft cylinder 2 when a knock rod 7 projecting from the rear end of the barrel 2 is pressed forward in the axial direction. 5
1 moves forward with the forward movement of the refill 3 and engages with the locking step 42 on the inner surface of the front end of the clip 4. On the other hand, when the clip 4 is lifted, the engaged state is released and the rearward movement of the refill 3 A knock-type writing instrument 1 having a clip safety mechanism in which the locking projection 51 moves backward, and a guide projection 52 projecting radially outward is provided behind the locking projection 51. A requirement is that the movable member can be moved (interlocked) in the front-rear direction while maintaining a constant distance from the locking protrusion 51 (claim 1).

(Operation) The guide projection 52 located behind the locking projection 51 prevents the front end of the folded portion 91 of the clamped body 9 from being caught on the rear surface of the locking projection 51. Further, since the guide projections 52 and the locking projections 51 are interlocked while maintaining a fixed interval, the guide projections 52 are always positioned at a fixed interval behind the locking projections 51. I have. Therefore, the locking projection 51
Since the distance between the guide projection 52 and the guide projection 52 does not increase, it is difficult for the folded portion 91 of the held body 9 to enter between the locking projection 51 and the guide projection 52, and the front end of the folded portion 91 Hooking on the locking projection 51 can be further avoided. (See Fig. 2)

In the knock-type writing instrument 1 of the first aspect, it is preferable that the guide projection 52 protrude more radially outward than the locking projection 51 (Claim 2).

(Operation) The guide projection 52 is located behind the locking projection 51, and protrudes farther outward in the radial direction than the locking projection 51. For this reason, after the clip 4 is inserted into the clamped body 9 having the folded portion 91 sewn with clothes or the like, when the writing instrument 1 is pulled out from the clamped body 9, the locking projection 51 is locked by the guide projection 52. Folded portion 91 at 9 edges (more specifically, folded portion 91
(The front end of the writing instrument) can be suppressed, and the writing implement 1 can be more smoothly extracted. (See Fig. 2)

Further, in the knock-type writing instrument 1 according to claim 1 or 2, a holding projection 41 having a locking step 42 is provided on an inner surface of a front end of the clip 4 so as to protrude radially inward and has a locking step 42. It is preferable that the front surface of the guide protrusion 52 and the rear surface of the holding protrusion 41 be close to each other when the engagement protrusion 42 and the locking protrusion 51 are engaged (claim 3). (FIG. 3
And FIG. 6)

(Function) By bringing the front surface of the guide projection 52 and the rear surface of the holding projection 41 close to each other, the gap between the rear surface of the guide projection 52 and the front surface of the locking projection 51 is made as small as possible. Folded part 91 at the edge
Is difficult to enter between the locking projection 51 and the guide projection 52, and can smoothly move from the rear surface of the guide projection 52 to the front surface of the locking projection 51, jumping over the rear surface of the locking projection 51, and The front end is the locking projection 51
Is further avoided.

The gap L (the maximum dimension in the longitudinal direction) between the front surface of the guide projection 52 and the rear surface of the locking projection 51 is 1
The range of mm to 5 mm is preferred. The reason is that if the gap is smaller than 1 mm, the engagement between the locking projection 51 and the locking step portion 42 becomes unstable, while if the gap is larger than 5 mm, the folded portion of the clamped body 9 is formed. This is because the effect of preventing the hook 91 from being caught is insufficient.

The rear surface of the guide projection 52 is preferably an inclined surface or a curved surface. Thereby, the catch between the guide protrusion 52 and the front end of the folded portion 91 at the edge of the held body 9 can be further suppressed.

[0014]

Embodiments of the present invention will be described with reference to the drawings.

1 to 8 show one embodiment of the present invention. The knock-type writing instrument 1 according to the present embodiment includes a shaft cylinder 2, a refill 3 housed in the shaft cylinder 2, and a pen tip 31 of the refill 3, the tip end hole 22 of the shaft cylinder 2 (specifically, a shaft). A retractable mechanism is provided at the front end of the cylinder 2 so as to be freely retractable through a distal end hole 22) of the tip body 21 which is detachable by screwing. The retracting mechanism has a clip safety mechanism that releases the pen tip protruding state and penetrates the pen tip 31 into the barrel 2 when the clip 4 of the writing implement 1 is inserted into a pocket or the like with the pen tip protruding. .

The retracting mechanism is a knocking retracting mechanism using a rotating cam mechanism, and is associated with a cylindrical cam cylinder 5 disposed in the shaft cylinder 2 and a cam portion of the cam cylinder 5. A rotor 6 which is brought into contact with the rear end of the refill 3;
And a resilient body 8 (for example, a coil spring) housed in the barrel 2 and urging the refill 3 rearward. Also,
The retracting mechanism is of a double knock type in which both the pen tip projecting operation and the pen tip retracting operation press the knock bar 7 forward.

(Safety Mechanism) The safety mechanism comprises a cam cylinder 5 having an engaging projection 51 protruding from the outer surface of the shaft cylinder 2 on the outer surface thereof, and a locking step 4 engaging with the engaging projection 51.
2 with a clip 4 provided on the inner surface. The cam cylinder 5
Is accommodated in the shaft cylinder 2 so as to be movable back and forth. The clip 4 is fixed to the outer surface of the barrel 2.

(Clip) The clip 4 is specifically obtained by injection molding of a synthetic resin, and projects integrally from the outer surface of the barrel 2. On the inner surface near the front end of the clip 4, a holding projection 41 is integrally provided. The holding projection 4
1 has a curved front surface and a rear surface, and a locking step portion 42 is formed on an inner surface of a front portion thereof.

(Cam Cylinder) The cam cylinder 5 is a cylindrical body, and is slidably accommodated in the shaft cylinder 2 so as to be able to move forward and backward. A locking projection 51 and a guide projection 52 are integrally provided on the outer surface of the cam cylinder 5. Further, a slide hole 23 is provided through the side wall of the shaft cylinder 2 facing the radial inner surface of the clip 4, and the locking projection 51 and the guide projection 52 are passed through the slide hole 23 from the inner surface of the shaft cylinder 2. 2 It protrudes slidably on the outer surface.

The locking projection 51 has a hook shape and can be engaged with the locking step 42 of the clip 4. The guide projection 52 is located rearward of the locking projection 51, protrudes largely radially outward from the locking projection 51, and has a mountain shape having inclined surfaces on the front and rear surfaces and a curved surface on the top. .

(Operation of Safety Mechanism) As shown in FIG. 3 or FIG. 6, during normal writing operation (ie, when the safety mechanism is not operated), the locking projection 51 of the cam cylinder 5 and the locking of the clip 4 are performed. The step portion 42 is engaged. At this time, the front surface of the guide protrusion 52 and the rear surface of the holding protrusion 41 are close to each other.

When the clip 4 of the writing instrument 1 is inserted into the clamped body 9 from the state shown in FIG. 3 or 6, the clip 4 is lifted outward in the radial direction, so that the safety mechanism operates, and the locking mechanism is engaged. The engagement between the projection 51 and the locking step 42 is released, and the locking projection 51 and the guide projection 52 move along the inner surface of the slide hole 23 with the rearward movement of the cam cylinder 5 due to the rearward bias of the resilient member 8. Move backward. As a result, the pen tip 31 is immersed in the barrel 2.

(Operation of Guide Protrusion) When the folded portion 91 exists inside the edge of the stitched held body 9, FIG.
As shown in FIG. 5, even when the clip 4 of the writing instrument 1 is inserted into a pocket, the front end of the folded portion 91 slides smoothly forward with the rear face of the guide section when the writing instrument 1 is pulled out from the clamped body 9. Then, the writing implement 1 can be smoothly removed from the clamped body 9 without being caught on the rear surface of the locking projection 51.

A concave curved surface 43 is provided at the boundary between the inner surface of the clip 4 and the rear surface of the holding projection 41. This allows
If FIG. 2 (the clamped body having the folded portion 91 on the inner surface)
Conversely, when inserted into the clamped body 9 having the folded portion 91 on the outer surface, the folded portion 91 is
The writing tool 1 can be smoothly pulled out without the front end of the writing tool being caught.

(Cam Tube) As shown in FIGS. 7 and 5, the cam tube 5 has a cam portion on its inner surface with which the rotor 6 is engaged. The cam portion includes a plurality of saw-toothed cam teeth 53 protruding forward, and three vertical grooves 54 formed between the cam teeth 53.

(Rotator) As shown in FIG. 8B, the rotor 6 has three ridges 6 extending longitudinally on its outer surface.
1, the rear end portion 61a of the projecting ridge 61 having an inclined surface shape,
The side surfaces 61b of the projection 61 that extend in the longitudinal direction are engaged with the vertical grooves 54 of the cam cylinder 5 while being engaged with the cam teeth 53 of the cam cylinder 5. Further, the rotor 6 is urged rearward together with the refill 3 by an elastic body 8 in the shaft cylinder 2. A small-diameter portion 62 is provided behind the rear end 61 a of the ridge 61, and the small-diameter portion 62 is loosely inserted into the knock bar 7.

(Knock Bar) As shown in FIGS. 8 (a) and 2, the knock bar 7 is a cylindrical body with a bottom, and has a plurality of serrated cam teeth 71 at the front end. The cam teeth 71
At least during the knocking operation, the rotor 6 can be engaged with the inclined rear end 61 a of the ridge 61 of the rotor 6.

(Operation of the retracting mechanism) Projection operation When the pen tip 31 is changed from the retracted state (FIG. 6) to the projected state (FIG. 3), the rear end of the knock rod 7 projecting from the rear end of the barrel 2 is moved forward. Press the button. At this time, the cam teeth 71 at the front end of the knock rod 7 and the rear end 61a of the inclined surface of the ridge 61 formed on the rotor 6 that comes into contact with the rear end of the refill 3 engage. Therefore, simultaneously with the pressing operation, the rotor 6 is moved forward while sliding the side surface portion 61 b of the ridge 61 in the vertical groove 54 of the cam cylinder 5. afterwards,
The ridge 61 comes out of the vertical groove 54 forward, and the rotor 6 becomes free in the rotation direction. At this time, since the rotor 6 is slightly fed in the rotation direction by the engagement between the cam teeth 71 of the knock bar 7 and the rear end 61a of the rotor 6, the rear end 61a of the ridge 61 is Is locked with the cam teeth 53. With the forward movement of the rotor 6, the refill 3
The urging body 8 is pressed forward against the forward bias, and the pen tip 31 projects forward from the distal end hole 22 of the barrel 2. By the engagement between the rear end portion 61a of the ridge 61 and the cam teeth 53 of the cam cylinder 5, the pen tip protruding state is maintained.

Immersion Operation When the pen tip 31 is changed from the protruding state (FIG. 3) to the immersing state (FIG. 6), the rear end of the knock bar 7 protruding from the rear end of the barrel 2 is moved forward as in the above-described operation. Press operation. At this time, the cam teeth 7 at the front end of the knock bar 7
1 engages with the inclined rear end 61a of the ridge 61 formed on the rotor 6 that contacts the rear end of the refill 3. Therefore, simultaneously with the pressing operation, the rotor 6 is slightly fed in the rotation direction, and the engagement between the rear end portion 61a of the protrusion 61 and the cam teeth 53 of the cam cylinder 5 is released. Since the rotor 6 is urged backward by the resilient body 8 via the refill 3,
At the same time as the disengagement of the rear end portion 61a of the ridge 61 and the cam teeth 53 of the cam cylinder 5, the rotor 6 is moved rearward with the rearward movement of the ridge 61 along the vertical groove 54. That is, the refill 3 is moved backward, and the pen tip 31 projecting forward from the tip hole 22 is immersed in the barrel 2.

(Refill) The refill 3 is provided with a ball-point pen tip (for example, a ball-point pen tip holding a ball having an outer diameter of 0.3 mm) at the tip, and an oil-based ink or a water-based ink and an ink of the ink inside. This is a ballpoint pen cartridge containing a follower (for example, a high-viscosity fluid such as silicone oil) that moves forward with consumption. The refill 3 can be removed from the barrel 2 and replaced by removing the tip body 21 (a tapered tubular body having a front end hole 22 at the front end) screwed to the front end of the barrel 2. The step on the inner surface of the tip body 21 holds the resilient body 8 for urging the refill 3 forward.

In the present invention, the rear surface of the locking projection 51 may be, for example, a vertical surface in addition to the hook shape.

In the present invention, the locking step 42
In addition to the configuration provided on the holding projection 41, for example, a configuration in which a dent or a hole is simply provided on the inner surface of the clip 4 may be used.

In the present invention, in addition to the ballpoint pen body, the pen tip 31 may be a fiber pen body, a porous pen body, a plastic extruded pen body provided with an ink outlet in the axial direction, or a capillary pen body. Any of a plate-shaped pen body having a slit at the tip (a so-called fountain pen nib), a mechanical pencil, and the like may be used.

In the present invention, the material of the clip 4 may be metal instead of synthetic resin. The clip 4 may be formed integrally with the barrel 2, or may be formed by attaching a separate member independent of the barrel 2.

[0035]

According to the first aspect of the present invention, there is provided a knock-type writing instrument.
When the writing instrument is removed from the clamped body after being inserted into the clamped body having the folded back portion sewn, the guide projection prevents the locking projection from being hooked on the folded portion of the clamped body, and The writing instrument can be removed from the object to be clamped, and damage to the object to be clamped can be avoided.

According to the second aspect of the present invention, the knock-type writing instrument further prevents the front end of the folded portion of the object from being caught by the locking projection.

The knock-type writing instrument according to the present invention further suppresses the catch between the guide projection and the front end of the folded portion of the clamped body.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pen tip retracted state (a state after a safety mechanism is actuated / clip disengaged state) according to an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of an essential part for explaining the operation of FIG.

FIG. 3 is a longitudinal sectional view of the embodiment of FIG. 1 in a pen tip protruding state.

FIG. 4 is an enlarged sectional view taken along line AA of FIG. 3;

FIG. 5 is an enlarged sectional view taken along line BB of FIG. 3;

6 is a longitudinal sectional view of the embodiment of FIG. 1 in a pen tip retracted state (a state before a safety mechanism is actuated / clip engaged state).

FIG. 7 is an enlarged vertical sectional view of the cam cylinder of FIG.

FIG. 8A is an enlarged view of the knock bar of FIG. 1,
(B) is an enlarged view of the rotating body of FIG.

FIG. 9 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Knock-type writing instrument 2 Shaft cylinder 21 Tip body 22 Tip hole 23 Slide hole 3 Refill 31 Pen tip 4 Clip 41 Nipping projection 42 Locking step 43 Concave curved surface 5 Cam cylinder 51 Locking projection 52 Guide projection 53 Cam tooth 54 Vertical groove Reference Signs List 6 rotor 61 ridge 61a rear end 61b side surface 62 small diameter portion 7 knock bar 71 cam tooth 8 resilient body 9 clamped body 91 folded portion L gap

Claims (3)

[Claims] When a knock rod (7) projecting from the rear end of a barrel (2) is pressed forward in the axial direction, a locking projection (51) projecting radially outward from the outer surface of the barrel (2). ) Moves forward with the forward movement of the refill (3) and engages with the locking step (42) on the inner surface of the clip (4) front end. On the other hand, when the clip (4) is lifted, the engaged state is changed. The locking projection (5) is released with the rearward movement of the refill (3).
1) A knock-type writing instrument having a safety mechanism for moving backward, wherein a guide projection (52) projecting radially outward is provided behind the locking projection (51), and the guide projection (52) is provided. A knock-type writing instrument, which is movable in the front-rear direction while maintaining a constant distance from the locking projection (51). 2. A knock-type writing instrument according to claim 1, wherein said guide projection (52) protrudes radially outward more than said locking projection (51). 3. A clipping projection (41) provided on the inner surface of the front end of the clip (4) and having a locking step (42) projecting radially inward.
And the locking step (42) and the locking projection (51) are provided.
3. The knock-type writing instrument according to claim 1, wherein the front surface of the guide protrusion (52) and the rear surface of the holding protrusion (41) are close to each other when the members are in an engaged state.