JPH0615733Y2 - Notch type writing instrument - Google Patents

Description

[Detailed Description of the Invention] "Industrial application field" The present invention relates to a writing instrument including an inner cylinder and an outer cylinder, in which an engaging portion provided on the outer cylinder is engaged with and disengaged from a locking portion of the inner cylinder. The present invention relates to an improvement of a knock-type writing instrument that is retracted from the front end opening of a cylinder.

“Problems to be Solved by the Prior Art and the Present Proposal” Conventionally, an engaging portion provided on a shaft cylinder, for example, a cursive body interlocking with an engaging portion of a clip member attached to the shaft cylinder is housed in the shaft cylinder, A writing instrument is widely known in which an engaging portion of a clip member is engaged with and disengaged from an engaging portion of a barrel to allow a writing body to project from and retract into an opening of the barrel.

However, although these are advantageous in terms of simplicity, they have drawbacks in smoothness of operation and durability.

Therefore, in order to solve these problems, the shaft cylinder is separated into an inner cylinder and an outer cylinder, and a clip member is attached to the outer cylinder.
Japanese Patent Application Laid-Open No. 63-16693, which realizes the smoothness of the operation of the clip member and the certainty of the operation of the writing body retracting mechanism by performing the retracting operation of the writing body by engaging and disengaging the clip member and the inner cylinder. No. (Actual Kaihei 1-212568
No. 9) has been devised, but since the shaft cylinder is separated into the inner cylinder and the outer cylinder, some problems occur in the relational structure between them.

To give an example of the problem, the end surface of the outer cylinder is always exposed as an exposed part with respect to the inner cylinder, which causes a problem that the writing instrument shaft cylinder becomes slender and the appearance is impaired. There is a tendency that it is not possible to sufficiently cope with the connection structure in which the cylinders are movable with respect to each other and the ease of assembly.

"Means for Solving Problems" The present invention has been made in view of these states of the prior art, and an engaging portion that meshes over a considerable length in the axial direction from the respective end surfaces of the inner cylinder and the outer cylinder. Is continuously formed on the outer peripheral surface of the shaft cylinder, and a ring member that abuts the inward locking stepped portion provided on the outer cylinder is fitted with the slit portion provided at the rear end of the inner cylinder having a reduced diameter. Means are used as means for solving problems.

[Operation] According to the present invention, since both end surfaces of the inner cylinder and the outer cylinder mesh with each other over a considerable length in the axial direction, the appearance of the exposed portion of the outer cylinder end surface with respect to the inner cylinder is completely eliminated. As a result, it is possible to easily obtain a slender writing instrument barrel and a beautiful appearance. Further, the connection between the inner cylinder and the outer cylinder can be easily realized by interposing a ring member fitted with the rear end portion of the inner cylinder having a reduced diameter.

[Example] Next, an example of the present invention will be described with reference to the drawings.

The shaft cylinder 1 is composed of an inner cylinder 2 and an outer cylinder 3. Both of them 2 and 3 are moved by the interposition of a ring member 5 fitted to the rear end portion 2b of the inner cylinder 2 by reducing the diameter thereof as described later. Connected as possible.

The inner cylinder 2 and the outer cylinder 3 have engaging portions 4 that mesh with each other from their respective end surfaces 2a, 3a over a suitable length in the axial direction thereof, and their outer peripheral surfaces are continuous with each other. Four
In the axial direction, when one is a convex portion 4a, the other is a concave portion 4b. For example, the inner cylinder 2 has the convex portion 4a.
In this case, the outer cylinder 3 is formed in the concave portion 4b.

It is important that the engaging portion 4 is formed on the outer peripheral surfaces of the inner cylinder 2 and the outer cylinder 3 so that the convex portions 4a and the concave portions 4b continuously and alternately mesh with each other. The shape and size of 4 may be appropriately determined. Furthermore, this engaging portion 4 that meshes
When looking at the convex portion 4a, for example, the convex portion 4a of the inner cylinder 2, the diameter in the radial direction from the center of the inner cylinder 2 is compared with the peripheral surface of the concave portion 4b, that is, the outer peripheral diameter of the outer cylinder 3. It is preferable that the diameters are the same or slightly smaller. It is advantageous that the convex portion 4a and the concave portion 4b of the engaging portion 4 are on the same surface, or that the convex portion 4a is recessed from the concave portion 4b, because it greatly contributes to the slimming of the writing instrument barrel. .

Of course, the present invention does not deny that the convex portion 4a protrudes from the peripheral surface of the concave portion 4b, and when the amount of protrusion is not extremely large, a pleasant feeling in a writing state is obtained. The added advantage is obtained.

As described above, the inner cylinder 2 and the outer cylinder 3 are connected to each other via the ring member 5. To describe this connection structure in more detail, the inner cylinder 2 has the outer diameter of the rear end portion 2b of the outer cylinder 3. The diameter is smaller than the inner diameter of the inward locking step portion 3b provided at the rear end portion 2b, and the rear end portion 2b is provided with a slit portion 6.

Further, a recess 7 is formed on the peripheral surface of the rear end portion 2b, and when the rear end portion 2b is located beyond the inward locking step portion 3b of the outer cylinder in the outer cylinder tail bottom portion 8 direction, A ring member 5 having a diameter larger than the outer diameter of the inner cylinder rear end portion 2b and capable of contacting the inward locking stepped portion 3b of the outer cylinder is formed by reducing the inner cylinder rear end portion 2b. Fit in place 7.

The ring member 5 fitted in the recess 7 is immovable in the axial direction of the shaft cylinder and abuts on the inward locking stepped portion 3b of the outer cylinder so that the inner cylinder 2 is axially moved relative to the outer cylinder 3. Detachment in the direction of the cylinder front end opening 2c is restricted. Of course, the outer diameter of the ring member 5 is smaller than the inner diameter of the outer cylinder 3.

In the inner cylinder 2, the cursive body 9 urged toward the outer cylinder rear end opening 3c by the elastic force of the coil spring S ₁ hooked between the inner cylinder step portion 2d and the writing body step portion 9a. It is housed in a loose fit, and its rear end portion 9b is in pressure contact with the tail bottom portion 8 attached to the outer cylinder 3.

In the figure, reference numeral 10 denotes a locking portion provided on the inner cylinder 2, and is capable of swinging on the clip member C provided on the outer cylinder 3, that is, specifically, on the tail bottom portion 8 attached to the outer cylinder rear end opening 3c. The engaging portion 11 of the provided clip member C disengages. As described above, the writing body 9 has its rear end portion 9b pressed against the outer cylinder tail bottom portion 8 by the elastic force of the coil spring S ₁ hooked between the inner cylinder step portion 2d and the writing body step portion a. , The relationship between the inner cylinder 2 and the outer cylinder 3 is
Due to the elastic force of the coil spring S _1, the coil spring S ₁ is pulled in mutually opposite directions, and the ring member 5 of the inner cylinder abuts on the inward engaging step 3 b of the outer cylinder, so
The connection relationship of 3 is surely maintained.

When the engaging portion 11 of the clip member engages with the locking portion 10 of the inner cylinder, that is, when the writing end 9c of the writing body 9 reaches a state where it is exposed from the front end opening 2c of the shaft cylinder (writing state), It goes without saying that the connection between the inner cylinder 2 and the outer cylinder 3 is maintained by the engagement state of the engagement portion 11 of the clip member and the inner cylinder engagement portion 10.

Further, in the figure, 8a is an elastic piece portion of the tail bottom portion 8, and
It is formed to have a diameter larger than the inner diameter of the rear end opening 3c, and an engaging portion 8a 'is provided at the end of the elastic piece 8a. As described above, the clip member C is attached to the tail bottom portion 8 so as to be swingable toward the center of the shaft cylinder, and the clip member C has the engaging portion 11 that engages and disengages with the inner cylinder locking portion 10. is there.

The tail bottom portion 8 provided with the clip member C is the outer cylinder rear end opening portion 3
The elastic piece portion 8a is reduced in diameter with respect to c and inserted into the rear end opening 3c, and the engaging portion 8a 'of the elastic piece portion is engaged with the locking portion 3d provided on the outer cylinder 3. It is integrated with the outer cylinder 3.

Although various structures are conceivable for the attachment structure of the clip member C to the outer cylinder 3, the clip member C is attached to the tail bottom portion 8 and the tail bottom portion 8 is reduced in its elastic piece portion 8a. The mounting structure in which the clip member C is mounted in advance in the outer cylinder 3 has the advantage that the clip member C can be mounted in advance, and the pressure contact of the cursive body 9 can be easily endured. , The tail bottom portion 8 to which the clip member C is attached in advance reduces the diameter of the elastic piece portion 8a and engages the engaging portion 8 thereof.
Since a'can be mounted on the outer cylinder 3 only by fitting it into the locking portion 3d of the outer cylinder, automatic assembly in the assembly process can be easily realized, and the effect to be achieved is great.

S ₂ in the figure is a coil spring as an elastic member mounted to apply a swinging force to the clip member C, and
P is a support rod for the clip member C, which serves as a fulcrum for swing operation,
Reference numeral 2'denotes a mouthpiece member detachably attached to the front end of the inner cylinder.

[Advantage of the Invention] The present invention is configured as described above, and the inner cylinder and the outer cylinder are easily maintained in their connection by the intervening action of the ring member fitted with the front end of the inner cylinder having a reduced diameter. In addition, since both cylinders are formed with engaging portions that mesh with each other alternately from their end faces, in the knock-type writing instrument of this type that presses the outer cylinder to achieve the writing state, the slender body of the barrel itself. It has advantages not seen in conventional products, such as a simple and easy-to-use appearance and a highly variable appearance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view for explaining the entire writing instrument implementing the present invention, FIG. 2 is an enlarged cross-sectional view of FIG. 1A-A, FIG. 3 is an enlarged cross-sectional view of FIG. 1B-B, and FIG. It is an exploded explanatory view showing the writing instrument concerning this part for every part. 1 ... Shaft cylinder, 2 ... Inner cylinder, 2 '... Mouth portion, 3 ... Outer cylinder, 2a, 3a ... End surface, 4 ... Engaging portion, 4a ... Convex portion, 4b ... Recessed portion Parts, 5 ... ring member, 6 ... splitting part, 7 ... recess, 8 ... tail bottom part, 8a ... elastic piece part, 8a '... engaging part, 2b ... inner cylinder rear end part, 3b ... Inward locking step of outer cylinder, 3d ... Outer cylinder locking part, 9 ... Writing body, 10 ... Inner cylinder locking part, 11 ... Clip member engaging part, C …… Clip member, S ₁ , S ₂ …… Coil spring.

Claims (3)

[Scope of utility model registration request] 1. A shaft cylinder is separated into an inner cylinder and an outer cylinder, which are movably connected to each other in the axial direction, and a rear end portion of the outer cylinder is pressed against a bottom portion of the outer cylinder to allow play in the inner cylinder. A knock-type writing instrument in which an engaging portion provided on an outer cylinder of a writing body housed in a fitting shape is engaged with and disengaged from a locking portion of an inner cylinder so that the writing body is projected and retracted from a front end opening of a shaft cylinder. Engaging portion 4 that engages with the cylinder 3 from its end faces 2a, 3a in the axial direction over a suitable length.
A knock-type writing instrument in which the outer peripheral surfaces of the inner cylinder 2 and the outer cylinder 3 are continuously provided. 2. The outer diameter of the rear end portion 2b of the inner cylinder 2 is formed to be smaller than the inner diameter of the inward locking step portion 3b provided in the outer cylinder 3, and the rear end portion 2b is provided with a slit portion 5. At the same time, a recess 7 is formed on the outer peripheral surface of the outer cylinder so that the inner cylinder rear end portion 2 extends in the direction of the tail bottom 8 of the outer cylinder.
At the position where b exceeds the inward locking step 3b of the outer cylinder,
A ring member 5 having an inner diameter smaller than the outer diameter of the inner cylinder rear end portion 2b and having an outer diameter capable of contacting the inward locking stepped portion 3b of the outer cylinder is formed by reducing the inner cylinder rear end portion 2b. The knock-type writing instrument according to claim 1, wherein the inner cylinder 2 and the outer cylinder 3 fitted in the recess 7 are connected so as to be movable in the axial direction. 3. A tail bottom portion 8 of an outer cylinder 3 against which a rear end portion 9b of a writing body 9 is pressed is formed separately from the outer cylinder 3, and the tail bottom portion 8 is engaged with and disengaged from a locking portion 10 of the inner cylinder 2. The clip member C provided with the engaging portion 11 is attached so as to be swingable toward the axial cylinder center in the axial cylinder front end opening 2c direction, and a part of the tail bottom portion 8 is elastic with a diameter larger than the inner diameter of the outer cylinder 3. The outer cylinder 3 is formed with a locking portion 3d with which the engaging portion 8a 'of the elastic piece portion 8a engages to reduce the diameter of the elastic piece portion 8a.
The knock-type writing instrument according to claim 1 or 2, wherein the engaging portion 8a 'is engaged with the locking portion 3d of the outer cylinder to integrate the tail bottom portion 8 and the outer cylinder 3.