JPH0675781U - Ink tank exchangeable writing instrument - Google Patents

Abstract

(57) [Summary] [Purpose] Attach the ink tank securely and smoothly to the specified position on the writing instrument body. [Structure] A collar portion 62 is provided on the outer periphery of the rear portion of the ink tank 6. A locking protrusion 7 or a sliding contact locking portion 8 is provided in front of the collar portion 62. On the other hand, a sliding contact locking portion 8 or a locking projection 7 is provided on the inner circumference of the rear end opening of the shaft cylinder 1. When the ink tank 6 is mounted, the locking protrusion 7 and the sliding contact locking portion 8 are pressed and engaged with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ink tank exchangeable writing instrument. More specifically, a pen tip and an ink storage member are provided in the front part of the shaft cylinder, and a connection part to which an ink tank is detachably attached is provided in the shaft cylinder behind the ink storage member, and a rear end opening of the shaft cylinder is provided. The present invention relates to an ink tank replaceable writing instrument of a type in which an ink tank is inserted from the portion, and the ink tank is attached to the connecting portion and opened.

[0002]

[Prior art]

 Conventionally, an ink tank was inserted from the rear end opening of the barrel, the ink tank was attached to the joint and the plug was opened, and then the collar provided on the rear of the ink tank was brought into contact with the rear end of the barrel. A structure that completes the mounting of the ink tank is disclosed in, for example, Japanese Utility Model Laid-Open No. 1-153284.

[0003]

[Problems to be solved by the device]

 However, with the conventional structure, the ink tank is mounted on the inner wall of the shaft cylinder before it is attached to the joint, and further, the ink tank outer peripheral surface and the shaft cylinder are protected so that the ink tank does not move carelessly during storage and transportation. The inner peripheral surface was in a press-fit state with a relatively large fitting force. Further, in the press-fitting structure, the two are in surface contact with each other, and moreover, the contact area is increased as the ink tank is inserted. Therefore, when the inking tank is pressed against the writing instrument main body, a considerable amount of pressing force is required and smooth mounting is not possible, and there is a risk that the pressing operation may be stopped and the ink may leak during the completion of mounting. .

The present invention is to solve the above-mentioned conventional problems, and an ink tank exchangeable writing instrument that can securely and smoothly attach an ink tank to a predetermined position of a writing instrument body without imperfectly attaching the ink tank. Is intended to provide.

[0005]

[Means for Solving the Problems]

 According to the present invention, the pen tip 2 and the ink retaining member 3 are provided in the front portion of the barrel 1, and the ink tank 6 is detachably attached to the rear side of the ink retaining member 3 in the barrel 1. An ink tank 6 replaceable writing instrument of a type in which the ink tank 6 is inserted from the rear end opening of the shaft cylinder 1 and the ink tank 6 is attached to the connecting portion 41 and opened. A locking projection 7 is provided in front of the portion 62 and the collar portion 62, and on the other hand, an appropriate length is provided in the axial direction where the locking projection 7 comes into pressure contact with the inner periphery of the rear end opening of the barrel 1. The sliding contact locking portion 8 is provided, and when the ink tank 6 is mounted, the locking protrusion 7 and the sliding contact locking portion 8 start to engage before opening, and after opening, the collar portion 62 It is a requirement that the shaft contact the rear end of the barrel 1.

Alternatively, a locking projection 7 is provided on the inner periphery near the rear end opening of the shaft cylinder 1, while the flange 62 is provided on the outer periphery of the rear of the ink tank 6, and the engaging member is provided in front of the flange 62. A sliding contact locking portion 8 having an appropriate length in the axial direction with which the stop projection 7 is in pressure contact is provided, and when the ink tank 6 is mounted, the locking projection 7 and the sliding contact locking portion 8 are engaged before opening the stopper. It is a requirement that the collar portion 62 abuts on the rear end of the barrel 1 after the opening and the opening.

[0007]

[Action]

 When the ink tank 6 is attached, at the moment when the locking projection 7 and the sliding contact locking portion 8 start pressure contact, a resistance is given to the operator's hand to increase the pressing force. After that, the ink tank 6 is vigorously moved forward by the pressing force while smoothly making the locking projection 7 and the sliding contact locking portion 8 slidably contact with each other, and the ink tank 6 is attached to the connecting portion 41 and opened. Finally, the collar portion 62 is brought into contact with the rear end of the barrel 1. In other words, the ink tank 6 is swiftly moved from the start of engagement of the locking projection 7 to the sliding contact locking portion 8 to the mounting completion position where the collar portion 62 contacts the rear end of the shaft cylinder 1. . Therefore, the pressing operation is not stopped in the middle of the mounting process, and further, the response to the mounting to the joint portion 41 and the opening at the time of opening can be reduced, and the smooth mounting is possible.

[0008]

Embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment.

A pen tip 2 and an ink storage member 3 are attached to the front part of the shaft cylinder 1, and a relay member 4 is fixed to the inner wall of the shaft cylinder 1 behind the ink storage member 3. The relay member 4 is provided at its rear portion with a coupling portion 41 to which the ink tank 6 is connected. The ink storage member 3 is a conventionally known member having a function of temporarily holding the overflow ink due to a change in the internal pressure of the ink tank 6, and here, the ink storage portion is formed by a large number of comb grooves. The constituent members are adopted. The fountain pen nib 2 is used here as the pen nib 2, but in addition to this, a ballpoint pen, a small tube pen body, a plastic pen body, a fiber pen body, or the like is suitable.

On the inner peripheral wall in the vicinity of the rear end opening of the shaft cylinder 1, there are arranged sliding contact locking portions 8 composed of four vertical ribs at equal intervals. The surface of the vertical rib is flat, and the opening side of the barrel 1 is tapered.

The ink tank 6 is provided with a grip portion 61 at a rear end thereof, a flange portion 62 at a front end of the grip portion 61, and an annular locking projection 7 on an outer peripheral wall in front of the flange portion 62. ing. Further, a plug 5 is attached to the front part of the ink tank 6. Further, although not shown, ribs, protrusions, grooves, and uneven patterns may be provided on the peripheral surface of the grip portion 61 to prevent slippage.

Further, since the cross-sectional shape of the locking projection 7 is a circular arc, while the surface of the sliding contact locking portion 8 is flat, the locking projection 7 and the sliding contact locking portion 8 are It is in point contact at four locations (see Figure 3). As a result, the contact area between the locking protrusion 7 and the sliding contact locking portion 8 can be made small, and the contact area can be made constant without increasing during the mounting process, and the frictional resistance can be kept small. ing. In other words, the pressing operation is not stopped in the middle of the mounting process, and smooth mounting is possible. Further, even after the mounting is completed, since the locking projection 7 and the sliding contact locking portion 8 are in the pressure contact locking state, a large force is not required to remove them when replacing the ink tank 6.

The outer diameter of the locking projection 7 is set to be slightly larger than the inscribed circle diameter of the sliding contact locking portion 8 to enable pressure contact engagement. Further, the position of the locking projection 7, the axial length of the sliding contact locking portion 8 and the like are also set so that they are in pressure contact with each other when the mounting is completed.

At the time of mounting, the ink tank 6 is inserted from the rear end opening of the shaft cylinder 1, and at the moment when the locking projection 7 and the sliding contact locking portion 8 start to be engaged, the ink tank 6 is slightly touched by the operator. It gives a positive response and increases the pressing force. After that, the pressing force is accelerated at once and mounted on the connecting portion 41 and opened, and then the collar portion 62 is stopped at the rear end of the barrel 1 to complete the mounting operation. That is, since the movement of the ink tank 6 is accelerated before the cap is opened, it is possible to reduce the mounting feeling to the joint portion 41 and the response when the cap is opened.

Further, in the mounting process, the slidable contact of the locking projection 7 with the slidable contact locking portion 8 also prevents radial fluctuation of the ink tank 6.

FIG. 4 shows a second embodiment. A grip 61 is provided at the rear end of the ink tank 6, a flange 62 is provided at the front end of the grip 61, and a locking projection 7 is provided in front of the flange 62.

The locking projection 7 is composed of four spherical projections. On the other hand, the inner peripheral wall near the rear end opening of the shaft cylinder 1 is provided with a sliding contact locking portion 8 composed of a circumferential smooth surface and a tapered surface on the opening side. The locking projection 7 and the sliding contact locking portion 8 are pressure-contact engaged with each other in a point contact state. The other structure is the same as that of the first embodiment.

FIG. 5 shows a third embodiment. A grip portion 61 is provided at the rear end of the ink tank 6, a flange portion 62 is provided at the front end of the grip portion 61, and a sliding contact locking portion 8 is provided in front of the flange portion 62. The sliding contact locking portion 8 is composed of a plurality of (four in this case) vertical ribs. The sliding contact locking portion 8 (longitudinal rib) has a taper portion at the front end and bulges like a kamaboko at the rear.

On the other hand, on the inner peripheral wall near the rear end opening of the barrel 1, a locking projection 7 having an arcuate cross section is formed in an annular shape. The other structure and operation are similar to those of the first embodiment.

FIG. 6 shows a fourth embodiment. A grip portion 61 is provided at the rear end of the ink tank 6, a flange portion 62 is provided at the front end of the grip portion 61, and a sliding contact locking portion 8 is provided in front of the flange portion 62. The sliding contact locking portion 8 is composed of a large diameter portion having a smooth surface, and has a taper portion at the front end.

On the other hand, a plurality of (here, eight) spherical locking projections 7 are provided on the inner peripheral wall near the rear end opening of the barrel 1. The other structure and operation are similar to those of the first embodiment.

[0022]

[Effect of device]

 The present invention can prevent the ink tank from being imperfectly attached to the main body of the writing instrument due to the above-described configuration, and further, can reliably and smoothly attach the ink tank at a predetermined position.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged explanatory view of a main part of a second embodiment of the present invention.

FIG. 5 is an enlarged explanatory view of a main part of a third embodiment of the present invention.

FIG. 6 is an enlarged explanatory view of a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Pen tip 3 Ink storage member 4 Relay member 41 Connecting part 5 Plug body 6 Ink tank 61 Gripping part 62 Collar part 7 Locking protrusion 8 Sliding contact locking part

Claims (2)

[Scope of utility model registration request] 1. A pen tip (2) and an ink retaining member (3) are provided on a front portion of a barrel (1), and an ink tank is provided in the barrel (1) behind the ink retaining member (3). (6) is provided with a detachable coupling part (41), the ink tank (6) is inserted from the rear end opening of the barrel (1), and the ink tank (6) is attached to the coupling part (4) and opened. In an ink tank exchangeable writing instrument of a type to be plugged, a collar portion (62) is provided on the outer periphery of the rear portion of the ink tank (6), and a locking projection (7) is provided in front of the collar portion (62).
On the inner periphery of the rear end opening of the shaft tube (1), a sliding contact locking portion (8) having an appropriate length in the axial direction with which the locking projection (7) is pressed.
When the ink tank (6) is mounted, the locking protrusion (7) and the sliding contact locking portion (8) start to engage with each other before opening, and after opening, the collar (62). ) Is configured to abut on the rear end of the barrel (1), the ink tank exchangeable writing instrument. 2. A pen tip (2) and an ink retaining member (3) are provided on the front portion of the barrel (1), and an ink tank is provided in the barrel (1) behind the ink retaining member (3). (6) is provided with a detachable coupling part (41), the ink tank (6) is inserted from the rear end opening of the barrel (1), and the ink tank (6) is attached to the coupling part (4) and opened. In the ink tank exchangeable writing instrument of the type to be plugged, a locking projection (7) is provided on the inner circumference near the rear end opening of the shaft cylinder (1), while a collar ( 62) and a sliding contact locking part (8) of an appropriate length in the axial direction at which the locking projection (7) is in pressure contact with the front of the collar part (62).
When the ink tank (6) is mounted, the locking protrusion (7) and the sliding contact locking portion (8) start to engage with each other before opening, and after opening, the collar (62). ) Is configured so that it comes into contact with the rear end of the barrel (1).