JPS586720Y2 - clip attachment device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for attaching a clip to a metal barrel or cap.

Conventionally, in a synthetic resin type writing instrument cap, a protrusion whose plane is approximately T-shaped is integrally provided on the outer circumferential surface of the upper end of the cap body, and clip legs are provided between both side edges of this protrusion and the outer circumferential surface of the cap body. A clip attachment device in which the clip attachment portion is inserted and locked from the axial direction is disclosed in Japanese Utility Model Application No. 52-5639, and a bulging protrusion is cut and raised in the clip attachment portion of the cap body of a metal writing instrument cap. A clip attachment device is also disclosed in Japanese Utility Model Application Publication No. 52-15936, in which bent edges on both sides of the flip leg are inserted and locked into the gap under the bulging protrusion. It has become a technology.

However, in the former clip attachment device, the T-shaped protrusion is molded integrally with the cap body, so in the case of a metal cap, the T-shaped protrusion must be made separately from the cap body and fixed by welding. There is a drawback that the processing cost is high, and this clip attachment device also has the drawback that the clip moves in the vertical direction.

In this respect, the latter clip attachment device does not have the above-mentioned problem, but two longitudinal strips are cut and formed in parallel to the longitudinal direction on the circumferential side of the circular tube body, and the loose pieces between the longitudinal strips are removed from the inside. Since the bulging protrusion of the clip mounting surface is formed by extending it out, when inserting and engaging the bent edge (sleeve piece) of the clip leg into the cut and raised gap of this bulging protrusion, the clip leg can be inserted and engaged. It has the disadvantage that it must be caulked from both sides, which takes time and effort to attach, and the attached clip also has the disadvantage that it moves in the left and right directions.

This invention was made to eliminate the above-mentioned conventional drawbacks, and its purpose was to cut and form a protrusion with a specially devised shape and configuration on the clip attachment part of the metal barrel or cap. A clip attachment device is provided in which a clip leg portion having a specially devised shape and structure is inserted into and engaged with this bulging protrusion so that the clip can be attached easily and reliably to prevent it from shifting in the vertical and horizontal directions. In order to provide the above-mentioned bulging protrusion, a special cutting plate part parallel to the tube axis having a clip insertion width and a connecting part at the upper and lower ends that stands up at an angle and having a width narrower than the width of the cutting plate part is used. The clip leg portion is inserted and locked from above between the bulging protrusion and the outer circumferential surface of the tube wall, and a bent edge in the shape of a rhinoceros is provided, and the upper and lower ends of the bent edge are The present invention is characterized in that it is formed in a special shape and structure in which a widthwise extending portion having a stopper step portion that engages with the inclined upright portion of the connecting portion is provided.

An embodiment of this invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a barrel of a knock-type mechanical pencil, which is composed of a small metal pipe with a diameter of about 5 mm, for example. A core membrane tube 3 that moves back and forth when operated to open and close a chuck mechanism (not shown) is fitted into the inner circumference of the shaft.

Reference numeral 4 denotes a bulging protrusion cut out and formed at the clip attachment part of the shaft tube 1 (for example, at the upper circumferential side position near the hook part 2) by punching out the tube wall from the inside, and has a clip insertion width a (for example, 2.5 mm). A cut-out plate part 5 parallel to the tube axis and having a width of about 100 mm, and upper and lower end connecting parts 6 and 7 of this cut-out plate part have a substantially T-shaped plane and an approximately ◇-shaped front surface. It is formed as a specially shaped bulging protrusion with a small side force f as shown in FIGS. 3 to 5.

Note that the width of the connecting portions 6 and 7 is the same as the cutout plate width a.
The width is set to be narrower (for example, about 1 mm), and both side edges 5a and 5b of the cutout plate portion 5 protrude on both left and right sides of the connecting portions 6 and 7 as shown in FIG.

The metal clips 10 attached to the shaft tube 1 are attached to both side edges 5a of the cut-out plate portion of the bulging projection 4.

A leg portion 13 having bent edges 11 and 12 which are inserted and locked from above between the outer peripheral surface of the tube wall of the shaft tube 1 is provided at the upper end, and an elastic portion is provided on the outer surface of the shaft tube 1 at the lower end. It has a structure as shown in FIGS. 6 to 8, which is provided with a contact portion 14 that comes into contact with the
The top surface of the leg portion 13 is open and the lower end surface is open, and the connecting portions 6 and 7 that stand up at an angle at the upper and lower ends of the bent edges 11 and 12 of the leg portions are bent in an abbreviated shape. 1st on the end face
Widthwise extending portions 11a, 11b, 12a, 12b having stopper step portions 16, 17 that engage as shown in the figure
are provided as shown in FIG.

Note that the ends of the lower extensions 11b and 12b opposite to the step are provided with insertion guide portions 11b' and 12 which are rounded and chamfered.
b' is provided.

The facing interval C between the extending portions 11b and 12b is set to be a little narrower than the width of the connecting portion 7,
When the clip is inserted into the bulging protrusion 4, the clip leg 13 elastically opens, and after insertion, the clip leg 13 returns to its original state due to its elasticity, and is prevented from being removed in the vertical direction by the stopper steps 16 and 17. It has become.

Therefore, the clip 10 has bent edges 11° and 12 of its leg portions.
The bent edges 11 and 5b of the cut-out plates are aligned so that they fit under the side edges 5a and 5b of the cut-out plates, and the bent edges 11, 12 is elastically inserted between the exploding surface of the shaft cylinder 1 and both side edges 5a, 5b of the cutout plate part 5, and the stopper step part 16.17 is inserted between the connecting parts 6, 7! It is engaged with both sides of the outer end surface and is securely inserted and fixed so that it will not come off in the vertical direction.

Although the above embodiment has been described as a clip attachment device for a metal barrel 1, it can also be applied as a clip attachment device for a metal writing instrument cap.

Since the clip attachment device of this invention is as explained above, when attaching the clip to the metal barrel or cap, the attachment part does not come out inside the barrel or the cap at all (the center is attached all the way around the inner circumference of the shaft). This is convenient because there are no obstructions when storing the storage tube 3), and it has the effect of making it easy and reliable.In particular, the bulge protrusion for inserting and fixing the clip leg is connected to the cutout plate and its upper and lower ends. It is formed by punching out the tube wall from the inside as a bulging protrusion consisting of a connecting part, and has a bent edge shaped like a clip leg and an extension part provided at the upper and lower ends of this bent edge. Since the clip is formed in such a structure, it is possible to reliably attach the clip without being displaced vertically or horizontally.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the main part of an embodiment of the clip attachment device of this invention in a state in which the clip is attached, and FIG. 2 is an I of FIG.
A sectional view taken along line I-II, Fig. 3 is a front view of the main part of the shaft cylinder to which the shoe is attached, Fig. 4 is a central vertical sectional view thereof, and Fig. 5
The figure is a plan view, Figure 6 is a vertical cross-sectional view of the clip, Figure 7 is a rear view of the clip leg portion, and Figure 8 is -■-v in Figure 7.
It is a sectional view of a line part. 1...Axis tube, 4...Bulging protrusion, 5...
... Cutout plate parts 5a, 5b...Both edges of the cutout plate parts, 6, 7...Connection part, 10...
...Clip, 11.12...Bent edge, ll
a, 12a, 11 b, 12 b... Widthwise extending portion of upper and lower ends of bent edge, 13... Clip leg portion, 16.17... Stopper edge .

Claims (1)

[Scope of utility model registration request] A cut-out plate part 5 parallel to the tube axis with a clip insertion width a is attached to the clip attachment part of a metal barrel or cap, and an inclined upper and lower end connection having a horizontal width narrower than the cut-out plate part width a. The bulging protrusion 4 consisting of the parts 6 and 7 is cut and formed by punching out the tube wall from the inside, and the clip 1
The upper end mounting leg portion 13 of 0 has a bent edge 11 that is inserted and locked from above between both side edges 5a and 5b of the cutout plate portion of the bulging projection 4 and the outer circumferential surface of the tube wall. . 12a,
11 b and 12 b are provided, and the leg bent edge 1
Insertion engagement with the bulging protrusion 4 of 1°12 and the bent edge extensions 11 a , 12 a , 11 b , 12 b
Stopper step 16,1 for bulging protrusion connection 6.7
7. A clip attachment device characterized in that the clip 10 is prevented from shifting in the left-right direction and the up-down direction by engagement of the clip 10.