JP3729618B2 - Writing instrument tail crown and writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tail crown that is attached to the rear end portion of a shaft tube of a writing instrument, and in particular, a tail crown such as a side knock type writing tool that extends a core by pressing an operation member attached to a window on a side wall of the shaft cylinder, and It relates to a writing instrument to which the tail crown is attached.
[0002]
[Prior art]
Conventionally, in this type of writing instrument, various attachments of the tail crown to the rear end of the shaft cylinder have been proposed.
First, in the press-fitting method in which the tail crown is attached by press-fitting to the rear end of the shaft tube, the fitting is not sufficient because it simply press-fits the cylindrical leg portion of the tail crown. There were inconveniences such as rotation of the crown.
[0003]
In addition, in the adhesive system where the adhesive is applied to the outer periphery of the leg of the tail crown and attached to the shaft tube, the adhesive adheres to areas other than the part to be applied, or if the work takes time, the adhesive dries and the adhesive strength is increased There was a disadvantage that it was lowered and the bonding work could not be performed.
[0004]
Furthermore, in the doweling method in which an annular groove is formed on the inner periphery of the shaft cylinder and a so-called dowel which is an annular ridge of the tail crown is fitted into the annular groove, a portion where the annular groove of the shaft cylinder is formed is thin. Thus, the shaft tube part was easily broken by the press fitting of the tail crown.
[0005]
In addition, in the case of a tail cap with a clip, the orientation of the clip becomes a problem at the time of attachment to the shaft tube, and the assembly work is technically difficult and labor-intensive, resulting in high costs.
[0006]
In particular, in the side operation (side knock and side slide) type writing instrument, the operation member formed on the front side wall of the shaft tube and the clip integrated with the tail crown are arranged coaxially in a plane after assembly. Is desirable. However, the direction of the tail crown must be taken into consideration when assembling into the shaft cylinder, and if the fitting with the shaft cylinder is insufficient, the tail crown rotates after installation and the positional relationship with the operating member is There was a risk of slipping.
[0007]
Further, in the side knock type writing instrument, the direction of the slider with which the side knock member abuts and the fitting rib or the fitting groove on the inner wall of the shaft cylinder are specially required as a detent means. Further, since the side knock member is only locked to one end of the window of the shaft cylinder, when the tip is removed, the internal mechanism moves forward and the knock member moves forward, or the internal mechanism rattles during the knock operation. There was a fear.
[0008]
Therefore, the present invention eliminates the above-mentioned conventional drawbacks, and it is not necessary to consider the direction of the tail cap when it is incorporated into the shaft tube. In addition, the assembly is simplified with one touch and the workability is high and the cost is high. The purpose of the present invention is to provide a tail crown and a writing instrument in which the tail crown does not rotate after assembly.
[0009]
In particular, in a side operation type writing instrument, it is an object to provide a tail crown and a writing instrument that can securely arrange a side operation member and a clip of a tail crown on a plane coaxial line during assembly, and can prevent rattling of an internal mechanism. And
[0010]
Furthermore, it is an object of the present invention to provide a writing instrument in which the tail crown can be attached by a fitting portion of a shaft cylinder that also serves as a directivity and a detent for the slider with which the side knock member abuts.
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there is provided a tail cap having a fitting means for fitting with a fitting portion formed on an inner wall of a rear end portion of a shaft cylinder in which a writing instrument mechanism is housed. A tail cap of a writing instrument is obtained in which the fitting means is a fitting rib or fitting groove formed on the outer wall of the tubular body of the tail crown from the front end toward the rear.
[0011]
Further, according to the present invention, a shaft cylinder that accommodates the writing instrument mechanism and has a fitting portion formed in the longitudinal direction on the inner wall, and a longitudinal direction from the tip to the rear corresponding to the fitting portion of the shaft cylinder A writing instrument comprising a tail cap having a fitting means formed on the outer wall is obtained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a tail cap and a writing instrument according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a side knock type mechanical pencil according to an embodiment of the present invention, and FIG. 2 is a side view thereof.
[0013]
In the figure, a tip 2 is removably attached to the tip of the shaft tube 1 by screwing. In addition, a pair of guide ribs 1a (fitting portions) opposed to the front from the rear end are formed on the inner wall of the shaft tube 1, and a slider 3 as shown in FIGS. 3 to 5 is formed on the guide rib 1a. It is slidably provided. 6 to 10 are diagrams showing the details of the shaft cylinder 1. FIG.
[0014]
Then, the slider 3 is brought into contact with an inverted U-shaped knock member 4 (operation member) locked to one end of the operation window 1b formed on the side wall of the shaft tube 1 to advance the slider 3 forward. A slope portion 3a, a chuck joint portion 3b into which a chuck is press-fitted, a small diameter portion 3c adjacent to the slope portion 3a, a rear end receiving portion 3d following the small diameter portion 3c, and an outer wall of the slider 3 are formed in the longitudinal direction; A guide groove 1e formed on the inner wall of the shaft tube 1 is configured with a guide groove 3e into which the guide rib 1a is fitted and slid.
[0015]
Further, a chuck 5 in which a chuck ring is loosely fitted is press-fitted and fixed in a chuck joint portion 3b of the slider 3, and a chuck spring 6 that urges the chuck mechanism backward together with the slider 3 is a cushion sleeve. 7 is interposed between the inner flange portion at the tip of 7 and the tip of the slider 3.
[0016]
As shown in FIG. 11, the cushion sleeve 7 includes a cylindrical main body 7a and a spring portion 7b connected to the cylindrical main body 7a. The spring portion 7b has a long hole 7ba and a notch 7bb. Each is formed facing each other. The front end of the cushion sleeve 7 is in contact with and locked to a step formed on the inner peripheral wall of the tip 2.
[0017]
Further, a slider 8 having a tip 8 a at the tip is slidably provided in front of the chuck 5 so as to protrude from the opening of the tip 2. The slider 8 acts to hold the core so that the core does not fall off. In the figure, reference numeral 9 denotes a grip member made of an elastic material provided at the grip portion of the shaft tube 1.
[0018]
A tail cap 10 integrated with the clip 10a is fixedly attached to the rear end portion of the shaft cylinder 1. That is, as is apparent from FIG. 14, the tail cap 10 has a cylindrical receiver 10b, a large diameter portion 10c integral with the cylindrical receiver 10b, a clip 10a connected to the large diameter portion 10c, and an eraser holding portion 10f. It consists of.
[0019]
A fitting groove 10d is formed in the side wall of the cylindrical receiver 10b from the large diameter portion 10c forward, and the introduction gradually expands from the open end of the fitting groove 10d toward the tip of the cylindrical receiver 10b. A groove 10e is formed. As will be described later, the introduction groove 10e functions as introduction means for fitting the tail cap 10 with the guide rib 1a of the shaft tube 1. As is clear from FIG. 8, reference numeral 1 c is a restriction rib formed on the inner wall from the window 1 b of the shaft cylinder 1 toward the front in order to prevent rattling of the internal mechanism.
[0020]
As shown in FIG. 13, a safety cap 11 having a top portion having a plurality of holes 11a is attached to the eraser holding portion 10f. Further, a core insertion hole 10g for filling the replenishment core is formed in the center of the holding portion 10f of the tail crown 10.
[0021]
Note that the fitting groove 10d of the tail crown 10 is not limited to that shown in FIG. 14, and as shown in FIGS. 16 and 17, from the open end to the innermost part of the fitting groove 10d. If the groove width is narrowed stepwise, the groove width is gradually narrowed from the open end to the back, and the fitting fixing portion 10dd slightly narrower than the width of the rib 1a of the shaft tube 1 is formed at the innermost portion. There is an advantage that the fitting between the two becomes extremely strong after assembly.
[0022]
In order to better understand the above embodiment, the assembly order will be described below. First, a chuck spring 6 is wound around the outer periphery of the chuck joint 3b at the front of the slider 3, and then the cushion sleeve 7 is attached to the outside of the chuck 3 and the chuck 5 loosely fitted with the chuck ring is press-fitted and fixed to the chuck joint 3b. To do.
[0023]
These mechanical assemblies are set in a state of being fitted to the guide rib 1a of the shaft tube 1 from the rear end of the shaft tube 1. Thereafter, the tip 2 is screwed onto the shaft tube 1 and one end of the knock member 4 is locked to one end of the operation window 1b of the shaft tube 1, and the tail cap 10 is pushed into the rear end of the shaft tube 1 and set. To do. In this case, an introduction portion 10e is provided in which the open end of the fitting groove 10d of the tail crown 10 is the widest and gradually narrowed, and then the fitting is the same as or slightly narrower than the width of the guide rib 1a of the shaft tube 1. Since the joint fixing portion 10dd is formed, the tail cap 10 is smoothly fitted and fixed to the shaft tube 1 reliably. If necessary, an appropriate number of cores are inserted from the core insertion hole 10g of the tail crown 10, and then an eraser is attached to the tail crown 10 and the safety cap 11 is set.
[0024]
The operation of the side knock type mechanical pencil according to the above embodiment will be described below. First, in order to feed the lead from the tip of the tip 8, when one end of the knock member 4 is pressed, the lower end thereof is lowered along the inclined surface portion 3 a of the slider 3, and the slider 3 is against the biasing force of the chuck spring 6. You can move forward. In this advancement process, the chuck ring is brought into contact with and locked to the locking step portion of the tip 2 so that the chuck 5 is released and the lead is fed out.
[0025]
In this case, the drawn-out core is held by the slider 8 and is in a writable state. When the knock member 4 is released, the slider 3 is retracted by the backward biasing force of the chuck spring 6. When the lead is stored, the tip of the lead may be lightly pushed in with a fingertip or the like.
[0026]
In knocking operation, since the knock member 4 is restricted to the restricting rib 1c formed on the inner wall of the barrel 1 (FIG. 8), Bruno click member 4 is locked to one end of the window 1b of the barrel 1 However, there is an advantage that when the tip 8 is removed, the internal mechanism does not advance and the knock member does not advance, and the internal mechanism does not rattle during the knocking operation.
[0027]
In the above-described embodiment, the example in which the fitting portion on the shaft tube side is the fitting rib 1a and the fitting means on the tail crown side is the fitting groove 10d has been described, but it is not necessarily limited to this example. It is not something. In other words, the present invention includes a case where the fitting portion on the side of the shaft cylinder having the opposite concavo-convex relationship is a fitting groove and the fitting means on the tail crown side is a fitting rib.
[0028]
In the above embodiment, the side knock type mechanical pencil has been described. However, the present invention is not limited to the above embodiment, and can slide on the window 1b of the shaft tube 1 as shown in FIG. It is also suitable for a side slide type ballpoint pen that slides on the operation member 4 provided on the side and advances the refill 12, and is also applicable to a rear end knock type writing instrument.
[0029]
【The invention's effect】
The present invention is implemented in the form as described above, and has the effects described below.
[0030]
There is no inconvenience such as the tail crown falling off or rotating after being attached to the shaft tube, and there is no problem with the direction of the clip when attaching to the shaft tube. As long as they are combined, the workability is good and the attachment is extremely strong.
[0031]
In particular, in the side operation type (side knock and side slide type) writing instruments, the operation member formed on the front side wall of the shaft tube and the clip integrated with the tail crown are accurately arranged coaxially in a plane after assembly. It is not necessary to consider the direction of the tail crown when assembling the shaft cylinder, and since the fitting is reliable, the tail crown rotates after installation and the positional relationship between the operating member and the tail crown is shifted. There is no fear of it.
[0032]
Further, in the side knock type writing instrument, the directionality of the slider and the rotation prevention can be achieved by using the engaging portion of the shaft tube, and the side knock member is locked to one end of the window of the shaft tube. However, when the tip is removed, the internal mechanism moves forward and the knock member moves forward, and the internal mechanism does not rattle during the knocking operation.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a side knock type mechanical pencil using a tail crown according to an embodiment of the present invention.
FIG. 2 is a side view of the mechanical pencil of FIG.
FIG. 3 is a front view in which a part of the slider of FIG. 1 is cut away;
4 is a side view of the slider of FIG. 3. FIG.
FIG. 5 is a cross-sectional view taken along line AA of the slider of FIG.
6 is a side view of the shaft cylinder of FIG. 1. FIG.
7 is a longitudinal sectional view of the shaft tube of FIG. 6. FIG.
8 is a transverse cross-sectional view taken along the barrel of the line B-B in FIG.
9 is a transverse cross-sectional view of the shaft cylinder of FIG. 7 along the line CC.
10 is a transverse cross-sectional view of the shaft tube of FIG. 7 taken along the line DD.
11 is an enlarged front view of the cushion sleeve of FIG. 1. FIG.
12 is an enlarged bottom view of the knock member of FIG. 1. FIG.
13 is an enlarged plan view of the cap of FIG. 1. FIG.
14 is an enlarged front view of the tail cap of FIG. 1. FIG.
Is a side view of the tail crown of FIG. 15] FIG. 14.
FIG. 16 is a front view showing a modification of the tail crown of FIG. 14 ;
FIG. 17 is a front view showing another modified example of the tail crown of FIG. 14 ;
FIG. 18 is a longitudinal sectional view showing a side slide type ballpoint pen according to another embodiment of the present invention.
[Explanation of symbols]
1 Shaft cylinder 2 Tip 3 Slider 4 Knock member ( operation member )
5 Chuck 6 Chuck Spring 7 Cushion Sleeve 8 Slider 9 Grip Member 10 Tail Crown 11 Cap 12 Refill

Claims (4)

A tail crown having a fitting means for fitting with a fitting portion formed on the inner wall of the rear end portion of the shaft cylinder in which the writing instrument mechanism is housed, and the fitting means is provided on the outer wall of the tubular main body of the tail crown. It is a fitting groove formed from the front end toward the rear, and the fitting groove is composed of at least a front end introduction portion and a deepest fitting fixing portion. A shaft cylinder that houses the writing instrument mechanism and has a fitting portion formed in the longitudinal direction on the inner wall, and a fitting means that is formed in the longitudinal direction from the tip to the rear corresponding to the fitting portion of the shaft cylinder The fitting portion of the shaft cylinder is a fitting rib, and the fitting means of the tail crown is a fitting groove. The fitting groove is at least the leading end and the introduction portion. writing instrument characterized by comprising consist fit fixing part of the inner part. The writing instrument pushes a knock member provided on the side wall of the shaft cylinder provided with the tip to advance the slider, and the lead is fed out by a chuck mechanism including a chuck ring, a chuck spring, and a chuck. a to brush Symbol tool, the inclined surface portion allowed to advance the slider in contact said slider knock member those, a chuck joint portion in which the chuck is press-fitted, and a small diameter portion adjacent the inclined surface portion, after following the small-diameter portion and the end receiving portion is formed in the longitudinal direction on the outer wall of the slider and is composed of a guide groove for forming the detent means in a fitting means formed on an inner wall of the barrel comprising the second aspect of the brush Symbol Ingredients. The barrel forms a regulating rib to the barrel inner wall in front of the window to be mounted with the knock member composed claim 3, wherein the brush Kigu.

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