JPH0872479A - Knock type writing implement - Google Patents

Abstract

PURPOSE: To provide an inexpensive writing implement which makes the exchange of writing bodies simple by the operation of a knock rod, eliminates the anxiety about defective knocking due to wear, etc., and is simple in assembly. CONSTITUTION: A writing body 3 is received in a shaft cylinder 1 while being energized backward by a return spring 4, and a knock rod 2 having two bonding parts which is interlocked with the writing body 3 in the axial direction is placed at the rear end of the writing body 3. When the writing body 3 is in a retreat position, a bonding part 12 for fixing is bonded on the rear end surface of a slit which is formed inside the clip fixing base part 30 of the shaft cylinder 1 to prevent the knock rod 2 and the writing body 3 from falling from the shaft cylinder. In this process, since the bonding is carried out in the bonding part 12, no load is applied to the working bonding part so that there is no anxiety about wear, etc. When an elastic piece 17 is pushed and deformed, the bonding part 12 is released from the bonding surface of the slit of the shaft cylinder so that the writing body 3 can be taken out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a so-called knock type ball-point pen in which a writing body such as a ball-point pen can be projected and retracted from a tip end of a barrel.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional writing instrument which is composed of a shaft cylinder, a knock rod, a writing body, and a return spring. is there. However, when replacing the writing body of this writing instrument, as shown in FIG.
For example, by pressing the locking portion of the knock bar with the tip of a ballpoint pen to release it from the locking surface of the barrel and remove the knock rod to replace the cursive body, or as shown in FIG. The writing body and the return spring are housed in the rear axle as two parts, and the rear axle is detachably screwed to the front axle, and the writing body is replaced by attaching and detaching the front axle. Therefore, since the one locking portion of the knock bar locks at the forward movement position and the backward movement position, a heavy load is applied to the locking portion at the time of impactingly abutting and locking the backward movement position, which is called durability. I am worried about the point.

[0003]

By the way, in the conventional writing instrument shown in FIGS. 1 and 2, it is difficult to replace the writing instrument because an auxiliary tool is required for exchanging the writing instrument. FIG.
In the writing instrument of the conventional example shown in (1), there is a problem that the cost of materials and assembling costs increase due to the increase in the number of parts. or,
In the above-mentioned structure, a load is constantly applied to the locking portion of the knock bar regardless of the appearance of the writing body, the locking portion and the arm are easily bent, and the knock mechanism may not operate normally. An object of the present invention is to solve such a problem.

[0004]

A knock-type writing instrument of the present invention devised to solve the above-mentioned problems is provided with two locking portions on a knock rod, and one writing portion is provided with a writing body as an axis. It has a cam function that allows it to slide to either the position protruding from the tip or the position retracted into the shaft, and the fixed locking action when the writing body projects from the tip of the shaft, while writing on the other locking part. It is possible to prevent the body from being detached from the barrel when the body is housed in the shaft, and to remove the knock bar when the locking portion is released from the locking surface of the barrel to replace the writing body. Also,
By providing two locking parts for the knocking rod, one for fixing the writing body in the forward position and the other for fixing it in the retracted position, when the writing body is in the retracted position, the load is applied to the locking part with the cam action. It is characterized in that it is configured so that it will not be applied.

[0005]

FIG. 4 to FIG. 8 show an embodiment of the present invention. First, as shown in FIGS. 4 and 5, the writing body 3 is housed in the barrel 1 in a state of being biased rearward by the return spring 4 and is locked at two positions interlocking with the writing body 3 in the axial direction. The knock bar 2 having the above is arranged at the rear end of the writing body 3.
The cursive body 3 has a check ball 6 housed therein and a ball-point pen tip 8 and an ink storage tube 9 are press-fitted into a joint 7 having a function of preventing backflow of ink. The ink containing tube 9 has low viscosity or basically has low viscosity, but statically has high viscosity, and the viscosity can be lowered by the rotation of the tip ball at the time of writing to allow the ink to flow out. The ink having the shear thinning property is filled, and the trailing end of the ink is also filled with a grease-like follower that can move in contact with and follow the ink surface as the ink is consumed. Further, a resin-made follower rod 10 is enclosed in the follower so that the center portion of the follower having fluidity is not deformed due to the impact or the like. A transparent PP resin molded product or the like is used for the ink containing tube.

Further, the knock rod 2 also has a cam mechanism for knocking operation, and is provided with a mechanism for exchanging the first actuating locking portion 11 for locking at the forward position and the cursive body, and at the backward position. The second fixed locking portion 12 for locking is provided with two locking portions. The operation locking portion 11 is located at the tip of the arm 13 which is perpendicular to the axis and has elasticity in the guide window direction. Further, as shown in the figure, the elastic portion 14a provided by forming a thin cut-out portion near the front end of the base portion 14 can be appropriately swung in the direction perpendicular to the axis line, so that the displacement of the arm 13 is smoothed. can do. Here, in order to increase the restoring force of the arm 13, the contact portion 15 of the arm 13 with the writing body 3 is slightly angled with respect to the writing body 3. Contact part 1 of arm 13 with cursive body 3
When the writing body 5 is pressed by the cursive body 3, a moment is generated and the actuating locking portion 11 on the arm 13 exerts a force to return to the original position. The strength of the moment can be adjusted by appropriately determining the size and position setting of the elastic portion 14a.
The protrusion 16 is for increasing the elastic force of the arm 13 in the guide window direction, and by applying the elastic force to the arm 13, it is possible to prevent an uncertain operation of the operation locking portion 11. In FIG. 4, the protrusion 16 is provided on the opposite side of the arm 13, but the protrusion 16 can be provided on the arm 13 itself. Further, adjusting the elastic force of the arm 13 by making the protrusion itself elastic is also an effective means for reliable operation. The fixed locking portion 12 is connected to the free end of the elastic piece 17 and can swing in the direction perpendicular to the axis. The flat surface 32 is provided so as not to interfere with the inclined surface 20 provided inside the barrel 1. The guide 33 is for the knock rod to slide inside the barrel parallel to the axis. It is desirable in terms of cost to integrally form each part of the knock rod 2 with a resin molded product having excellent elasticity.

7 and 8 show each part of the guide window with respect to the actuating locking part 11. An upper guide window and a lower guide window are provided in the barrel 1. Further, a groove 18 and a groove 19 for moving the operation locking portion 11 from one guide window to the other guide window.
Is provided on the inner surface of the barrel 1. Groove 1 on the inner surface of barrel 1
An inclined surface 20 is formed between the groove 8 and the groove 19.

[0008]

The operation will be described below based on the above embodiment.
The arrow in FIG. 7 indicates the movement path locus of the operation locking portion 11. First, when the cursive body 3 is in the retracted position, the knock bar 2
Is locked to the rear end surface of the slit 31 by the fixed locking portion 12. When the knock rod 2 is pushed from this position, the engagement portion guide surface 21 of the actuating engagement portion 11 becomes the shaft tube guide surface 23 of the shaft tube 1.
Along to the stop wall 24. From here, the actuating locking portion 11 moves under the action of the actuating portion inclined surface 22 into the shaft cylinder and moves to the lower guide window through the groove 18 provided on the inner surface of the shaft cylinder. While the operation locking portion 11 moves in this manner, the arm 13 remains bent in the circumferential direction by the elastic body 14. When the operating locking portion 11 enters the lower guide window, the operating locking portion opens radially outward due to the elastic force of the arm. Further, the elastic locking force stored in the elastic body causes the operation locking portion 11 to contact the receiving surface.
Here, when the pushing of the knock bar 2 is stopped, the operation locking portion 11
Moves along the receiving surface 25, contacts the guide window end surface 26, and is locked by the locking surface 27.

Further, when the writing stick 3 is in this forward position, when the knock rod 2 is pushed, the operating portion inclined surface 2 of the operating locking portion 11 is pushed.
2 moves toward the unlocking surface 28, and the operation locking portion 11 is pushed inward in the radial direction. The operation locking portion 11 has a guide window end surface 26.
It is further disengaged, moves in the circumferential direction, restores its natural state, and moves until the locking portion stop surface 29 contacts the side surface of the groove 19. The movement of the operation locking portion 11 to this position is facilitated by the inclined surface 20 formed between the groove 18 and the groove 19 on the inner surface of the barrel.
When the operation locking portion 11 is in this position, the arm is elastically deformed radially inward. Here, when the load on the knock bar is released, the operation locking portion passes through the groove 19 and opens radially outward by the elastic force of the arm 14 to enter the upper guide window. At this time, the fixing locking portion 12 is the clip mounting base portion 30 of the shaft cylinder 1.
It is locked by the rear end surface of the slit 31 provided on the opposite side to prevent the knock bar 2 and the writing body 3 from falling off the barrel. This slit 31 is provided parallel to the axis,
When the knocking operation is performed, the fixing locking portion 12 can move only in the direction parallel to the axis line, so that the knocking rod can be prevented from rotating even with a round shaft cylinder.

When the cursive body 3 is in the retracted position, it is locked by the shaft cylinder 1 and pushes the elastic piece 17 to deform it, the fixed locking portion 12 is released from the locking surface of the slit of the shaft cylinder, and the cursive body 3 is removed. It is possible to take it out. Operation locking part 11 of knock bar
A groove is provided on the inner surface of the shaft cylinder of the clip mounting portion so that the clip can be taken out without interfering with the inner surface of the shaft cylinder 1.

[0011]

As described above, the present invention is as described above. When the writing body is in the stored state, when the knock rod is pinched and the elastic body is deformed, the fixing engagement portion is released from the engagement surface of the slit of the barrel. You can take out the cursive with the knock stick. Further, when the cursive body is in the stored state, it is locked by the locking part for fixing, so that the operation locking part of the knock bar, which is the main part of the knocking mechanism, is not burdened at all, and the member may fall. Since there is no knock, the knocking does not make writing impossible. Further, since the writing portion can be projected and retracted only by pressing the knock, it is easy to use and the structure is simple, so that the assembly is easy and it can be provided at a low cost. Further, since the cursive body appears and disappears by repeatedly pressing the knock bar, the finger is always in contact with the knock bar, and it is possible to reduce the impact on the cursive body, and the ink inside the cursive body is There is no need to worry about moving due to shock and disabling writing.

[Brief description of drawings]

FIG. 1 is an external perspective view of a conventional knock-type writing instrument, showing a component structure of the writing instrument.

FIG. 2 shows a method of exchanging a writing body in a state where a writing knocking tip portion of a conventional knock-type writing implement is immersed in a barrel from a tip end of a barrel.

FIG. 3 is an external perspective view of another conventional knock-type writing instrument, showing a component structure of the writing instrument.

FIG. 4 is a vertical cross-sectional view showing the entire ball-point pen that is an embodiment of the present invention, showing a state in which the writing tip is immersed.

FIG. 5 is a cross-sectional view of a main part seen through from above, which is the clip side in FIG.

FIG. 6 is an external perspective view of a knock rod used in the embodiment.

FIG. 7 is an explanatory view showing a state in which the operation locking portion of the knock rod is operated and locked with respect to the guide window portion of the shaft cylinder.

8 is a cross-sectional view taken along the line AA of the shaft cylinder portion of FIG.

[Explanation of symbols]

 1 shaft cylinder 2 knock rod 3 cursive body 4 return spring 5 clip 6 check ball 7 joint 8 tip 9 ink storage tube 10 follower rod 11 actuating locking portion 12 fixing locking portion 13 arm 14 base portion 14a elastic portion 15 contact portion 16 Protrusions 17 Elastic Pieces 18 Grooves 19 Grooves 20 Sloping Surfaces 21 Locking Part Guide Surfaces 22 Actuating Part Slopes 23 Shaft Cylinder Guide Surfaces 24 Stop Walls 25 Receiving Surfaces 26 Guide Window End Surfaces 27 Stop Surfaces 28 Lock Release Surfaces 29 Locking Parts Stop surface 30 Clip mounting base 31 Slit 32 Flat surface 33 Guide

Claims (4)

[Claims] 1. A member for accommodating a writing body in a shaft cylinder having a guide window provided on a side surface of a rear end thereof in a state of being biased rearward by a return spring and for interlocking with the writing body in an axial direction. A knock rod having a stop is arranged at the rear end of the writing body, and the rear end of the knock rod protruding from the rear end of the barrel is knocked to advance the writing body and guide the locking portion of the knock rod. Move along the edge of the window and make the locking part dive into the barrel from the end of the window,
When it is advanced further, the locking part projects from the front window and becomes locked to the edge of the guide window, the writing tip is projected from the shaft tip opening, and when the knock bar is further pressed from that state, the locking part is re-engaged. In a knock-type writing instrument in which the writing body is retracted and the writing tip is housed in the shaft while simultaneously sliding in the shaft cylinder and sliding laterally to release the locked state, the knock rod is the shaft cylinder. The first locking portion having flexibility for locking the writing body at the forward position by locking the edge of the guide window formed on one side surface of the guide tube is different from the guide window provided on the barrel. Rear end portions of the knock rods that are provided integrally with second flexible locking portions that are fitted into the slits and that prevent the knock rods from coming off from the shaft cylinders in the retracted position, and that protrude toward the rear end of the shaft cylinders. By narrowing the portion, the second locking portion is released and the knock rod is disengaged from the shaft cylinder. Knock-type writing instrument, wherein the conversion is configured to be. 2. To ensure the operation, a protrusion for increasing the elastic force toward the guide window is provided at the elastic portion of the knock rod at an angle outward to the axis, and the knock rod is pressed to activate the operation locking portion. 2. The knock according to claim 1, wherein the force applied to the actuating locking portion when moving along the guide surface of the guide window of the axial cylinder has a larger radial force than a circumferential force. Writing instrument. 3. The cursive body has a tip of a ballpoint pen at the tip and an ink containing tube at the rear, and the ink containing tube has low viscosity ink or basically low viscosity, but statically high viscosity. In addition, the ink has a so-called shear thinning viscosity in which the viscosity is reduced by the rotation of the tip ball during writing and the ink flows out, and a follower is provided at the rear end of the ink to follow the consumption of the ink. The knock-type writing instrument according to claim 1, wherein: 4. The cursive body is provided with a ball valve for preventing backflow of ink, and the follower is formed into a grease shape,
The knock-type writing instrument according to claim 3, wherein a resin-made follower rod having substantially the same specific gravity is immersed in the follower.