JPH0423028Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to an improvement of the tail crown mounting structure of a notch-type writing instrument such as a sharp pencil or ballpoint pen.

[Conventional technology]

The tail cap of a conventional knot-type writing instrument has a stepped small-diameter annular portion at its front end, and a male threaded portion carved on the outer circumferential surface of this small-diameter annular portion is inscribed on the inner circumferential surface of the rear end of the outer cylinder. It has a mounting structure in which it is connected by screwing into the female threaded part provided. In addition, as other means, the tail crown was simply press-fitted or glued to the rear end of the outer cylinder.

[Problem that the invention attempts to solve]

In such a conventional tail crown mounting structure of a notch type writing instrument, the small diameter annular part of the tail crown which is the attachment part to the outer cylinder is very short, and the small diameter annular part is simply inserted into the rear end of the outer cylinder and connected. If only this was done, the tail crown would become loose, making its installation unstable, and there was a risk of it falling off. Therefore, the small-diameter annular portion of the tail crown is screwed into the rear end side of the outer cylinder. However, in the case of such screwing, it is necessary to perform thread cutting on each of the small-diameter annular portion of the tail crown and the outer cylinder, and the thread cutting requires precision, is very troublesome, and is expensive. It was bulky, and when attaching the tail crown, the tail crown had to be screwed into the outer cylinder, which was a time-consuming process. In addition, in the case of conventional writing instruments equipped with a rotating cam mechanism that moves the refill forward and backward by rotating intermittently by knob operation, the axial length of the tail cap is very short as mentioned above. However, the rotary cam mechanism must be provided separately, and the installation work becomes even more troublesome. This idea was made to solve the above problem, and it is possible to easily and reliably attach the tail crown with good stability by simply inserting the tail crown from the rear inside the rear end of the outer cylinder. To provide a tail crown mounting structure for a knob-type writing instrument, which allows the user to mount a rotary cam mechanism together with the tail crown.

[Means to solve the problem]

The tail crown mounting structure of this devised notsuku style writing instrument is
A locking means formed on the tail crown is inserted into the rear end side of the outer cylinder from behind and is locked in the outer cylinder.

[Effect]

In this device, the locking means formed on the tail crown is inserted into the rear end of the outer cylinder from behind, thereby inserting and fitting the locking means into the outer cylinder, thereby allowing the locking means to be inserted and fitted into the outer cylinder. The tail crown is securely and firmly attached to the rear end of the tube.

【Example】

This invention will be explained below based on the drawings. Fig. 1 is a sectional view of a ballpoint pen according to an embodiment of this invention, Fig. 2 is an enlarged sectional view of its tail cap attachment part, and Fig. 3 is a tail cap mount with the refill and its knob system removed from Fig. 2. FIG. 4 is a longitudinal sectional view of the outer cylinder, and FIG. 5 is a sectional view taken along the - line in FIG. 3. In the figure, reference numeral 1 denotes an outer cylinder of a ballpoint pen, and a tip 2 is removably attached to the tip of the outer cylinder by screwing means. A refil 3 is inserted into the outer cylinder 1 so as to be slidable in the axial direction. The refill 3 is urged in the backward direction by an elastic body 4 such as a spring interposed between a protrusion 3a integrally formed on the outer peripheral surface near the tip and a step 2a in the tip 2. There is. Further, a plurality of guide ribs 5 (see FIG. 4) are integrally formed on the inner peripheral surface of the outer cylinder 1 along the axial direction at regular intervals in the circumferential direction. A tail crown 6 is provided at the rear end of the outer cylinder 1. This tail crown 6 has a clip 7 integrally therein, and a joint cylinder portion 8 is coaxially and integrally connected to the front end of the tail crown 6. The joint cylindrical portion 8 is inserted into the outer cylinder 1 from the rear and is locked within the outer cylinder 1 by a locking means 9. In this embodiment, the locking means 9 is, for example, connected to the joint cylindrical portion 8 as shown enlarged in FIGS. 2 and 3.
It is formed of a locking piece that projects from the outer circumferential surface of the locking member and has a tapered claw shape whose front end side is gradually inclined toward the inner diameter direction. By press-fitting the tail crown 6 from the rear end of the outer cylinder 1, this locking means 9 crushes the guide rib 5 on the inner peripheral surface of the outer cylinder 1 as shown in FIG. is formed. Here, since the locking means 9 is formed into a predetermined tapered shape as described above, the guide rib 5 can be crushed and formed smoothly and reliably. In addition, the locking means 9 is not limited to the above-mentioned locking piece, and the locking means 9 is not limited to the locking piece described above.
Any means may be used as long as it can be secured to the inner circumferential surface of. Further, a rotary cam mechanism 10 for moving the reflex wheel 3 forward and backward by a knock operation is mounted and housed within the joint cylinder portion 8. As shown in FIG. 2, the rotary cam mechanism 10 includes a cylindrical rotary cam 11 that is housed in a joint cylinder portion 8 and into which the rear end side of the refil 3 is fitted and connected, and a cylindrical rotary cam 11 that is axially inserted into the shaft hole of the tail crown 6. It consists of a knock rod 14 which is slidably inserted into the cam 11, has a front end interlocked with the rear end of the rotary cam 11, and has a rear end directed outward to the rear of the tail crown 6. The rotating cam 11 has a guide rib 11a (see FIG. 2) provided along the axial direction on the outer peripheral surface, and a cam surface 11b formed on the rear end surface. The guide rib 11a is slidably engaged in the axial direction of cam grooves 12 and 13 (see FIGS. 3 and 4) formed on the inner circumferential surface of the joint cylindrical portion 8, and is engaged with the knock rod 14. It is designed to come off the cam grooves 12 and 13 at the forward position. Therefore, the joint cylinder portion 8 also serves as a cover for the rotary cam mechanism 10. On the other hand, a cam surface 14a is formed at the front end of the knock rod 14, and this front end cam surface 14a is removably engaged with the rear end cam surface 11b of the rotating cam 11. In this rotary cam mechanism 10, when the rotary cam 11 is advanced in the axial direction when the knock rod 14 is knocked in one step, and the guide rib 11a is disengaged from the cam grooves 12 and 13 in the advanced position as described above, the reflex 3 is moved forward.
The rotating cam 11 moves backward due to the backward biasing force, and during this retreat, the rear end cam surface 11b of the rotating cam 11 is guided by the front end cam surface 14a of the knock rod 14, the rotating cam 11 rotates, and the cam surfaces 11b, 14a rotate. By engaging with each other, the refill 3 is held in the knocking forward position, and the rotary cam 11 advances and retreats during two-step knocking, and the cam surface 11
The mutual meshing position of b and 14a is changed to the refill 3 storage position. A knock cap 15 is fitted onto the rear end of the knock rod 14. Next, the assembly and operation of the above embodiment will be explained. First, during assembly, by inserting the joint cylinder part 8 of the tail crown 6 from behind into the rear end side of the outer cylinder 1 into which the elastic body 4 and refil 3 are inserted, the rotation inside this joint cylinder part 8 is caused. Refile 3 in cam 11
When the rear end side is inserted, the locking means 9 of the joint cylinder portion 8 crushes and locks the guide rib 5 as shown in FIG. 5, and the tail crown 6 is fitted to the rear end of the outer cylinder 1. This completes the assembly of the ballpoint pen. When using this ballpoint pen, when the knock cap 15 is knocked from the retracted state of the refill 3, the rotary cam mechanism 10 is moved through the knock rod 14.
is operated as described above, and the refill 3 is kept in the forward position and in use. When the user clicks the button further from this state, the refill 3 is retracted by the operation of the rotary cam mechanism 10. FIG. 6 is a sectional view of a sharpening pencil according to another embodiment. In this embodiment, a core feeding mechanism 16 is disposed at the tip of a refill (core pipe) 3 that is slidably inserted into the outer cylinder 1 in the axial direction. The lead feeding mechanism 16 includes a lead chuck 17 connected to the tip of the refill 3, a chuck tightening ring 18 that tightens the lead chuck 17, and an elastic body 4 that biases the refill 3 in the backward direction. There is. Further, the rear end side of the refill 3 passes through the shaft hole of the tail cap 6, and an eraser holder 19 which also serves as a cap for supplying lead is removably inserted into the rear end of the refill 3. A cap 15 that covers the eraser 20 is fitted onto the holder 19. The tail cap 6 and its mounting structure in this embodiment are the same as those in the previous embodiment. Note that the locking means 9 may be a screw-in means.

[Effect of the idea]

As described above, according to this invention, by partially providing the guide ribs inside the outer cylinder, it is easy to insert and fit the locking means into the inner wall of the outer cylinder, so the workability is good, and Since it can be inserted and fitted easily, it is more stable and the outer cylinder does not deform. In particular, since the locking means crushes the guide rib,
Can be installed securely. Further, since a rotary cam mechanism for refeel feeding can be installed and housed in the joint cylinder, it is also possible to attach this rotary cam mechanism to the outer cylinder together with the tail crown.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a ballpoint pen according to an embodiment of this invention, Fig. 2 is an enlarged sectional view of its tail cap attachment part, and Fig. 3 is a tail cap mount with the refill and its knob system removed from Fig. 2. Figure 4 is a longitudinal cross-sectional view of the outer cylinder, and Figure 5 is an enlarged cross-sectional view of the outer cylinder.
A line sectional view, FIG. 6 is a sectional view of a sharpening pencil according to another embodiment. In the figure, 1 is an outer cylinder, 3 is a refill, 6 is a tail crown, 8 is a joint cylinder, and 9 is a locking means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In the tail crown mounting structure of the tail crown 6 which is fitted to the rear end of the outer cylinder 1 and which is inserted through the rear end side of the refil 3 housed in the outer cylinder 1, the joint cylinder part 8 of the tail crown 6 is fitted. A locking means 9 is formed, and the locking means 9 is inserted and fitted into the inner wall of the outer cylinder 1 in a state where the guide rib 5 partially provided inside the outer cylinder 1 is pressed and locked. The tail crown mounting structure of a notsuku-style writing instrument is characterized by: