JPH0123833Y2 - - Google Patents

Description

[Detailed description of the invention] This invention accommodates two cursive writing instruments, a sharp pencil and a ballpoint pen, in one shaft, and selectively moves the tip of each cursive into the tip of the tip by switching operations as necessary. This relates to a double writing instrument that can appear and appear at will. Conventional dual-action writing instruments of this type have a method of removing the eraser placed at the rear of the lead pipe and inserting the lead when refilling the sharp pencil with refills, as disclosed in Japanese Patent Application Laid-Open No. 160886/1986 and Japanese Patent Application Laid-Open No. 55/1989. −137997
It has become publicly known through publications such as No.

By the way, if the eraser is arranged on the rear extension line of the lead pipe as in this known example, when the sharp pencil passes the ballpoint pen and moves backward, the front end of the refill located in front of the eraser will be grasped by the chuck. If the refill comes into contact with the rear end of the writing refill, the refill will be caught between the receding writing receptacle and the eraser, causing problems such as breakage of the refill. Therefore, in order to allow the refill to escape even if the writing lead held in the chuck comes into contact with the refill when the sharp pencil retreats, the structure of the above-mentioned known example requires measures such as making the shaft length sufficiently long. However, there was a problem in that the external design and usability were impaired.

Therefore, the present invention has a structure in which the refill can be refilled from the rear into the lead pipe, so that even if the refill comes into contact with the writing lead held in the chuck when the sharp pencil passes the ballpoint pen and retreats, there is no place for the refill to escape. The purpose of the present invention is to provide a compound writing instrument that does not necessarily have a lead that breaks and does not require sacrificing external design or usability by increasing the shaft length.

In order to achieve the above object, the double-action writing instrument of the present invention has a sharp pencil and a ballpoint pen, each having a fixed sliding piece, slidably fitted into an axial groove provided in a guide tube that fixes the pen to the tip. , a cylindrical cam having a circumferential cam slope is attached to the outer circumference of the guide tube so as to be rotatable and movable in the axial direction with respect to the guide tube, and the cap and the cylindrical cam are connected in the rotational direction at the inner diameter of the cap. The cam slope of the cylindrical cam is integrally brought into contact with the sliding piece so that when the cap, that is, the cylindrical cam, is rotated, the sliding piece is moved on the cam slope. A hole slightly larger than the outside diameter of the core pipe is provided at the rear of the groove in which the sharp pencil is fitted in the rear part of the guide tube, and the rear end of the core pipe is opened and protrudes backward from the sliding piece. By fitting into the hole, the rear end of the core pipe can be slid within the hole when the sliding piece moves back and forth,
Furthermore, a funnel is provided at the rear end of the guide tube, and the funnel has a large diameter section for accommodating the eraser and a small diameter section next to it that communicates with the hole. be.

Embodiments of the present invention will be described below with reference to the drawings.

The basic structure and functions of the sharpening pencil are the same as those of a regular sharpening pencil, so the explanation will be omitted.

First, the sharpening pencil 1 is attached to the guide tube 2 which is fixed to the tip shaft 27 as described later.
It is slidably fitted into one of the two grooves. A core pipe 3 is integrally connected to the rear end of the sharpening pencil 1, and a flange-shaped locking part 5 is provided on the outer periphery of the rear part of the core pipe 3, and the front end of the sliding piece 4 comes into contact with it and is fixed. has been done. The core pipe 3 passes through the inner diameter part of the sliding piece 4 and protrudes rearward for a long time. A step 8 is provided at the rear end of the groove of the guide tube 2 on which the sliding piece 4 slides, and a hole 9 slightly larger than the diameter of the core pipe 3 is formed behind the step 8.
The rear end of the aforementioned lead pipe 3 is slightly fitted into the hole 9 when the tip of the sharpening pencil 1 protrudes from the tip end opening of the tip as shown in the figure.
When the tip of the sharpening pencil 1 is inserted into the tip of the tip shaft, the lead pipe 3 moves backward together with the sliding piece 4 until the rear end of the sliding piece 4 comes into contact with the step 8 of the guide tube. The rear end of the guide tube 2 fits into the hole 9 of the guide tube 2. A return spring 6 is interposed between the locking portion 5 of the core pipe 3 and a spring receiver 81 that is in contact with the step at the front end of the groove of the guide tube 2 so as to bias the sharp pencil 1 backward. There is. In addition, a ballpoint pen 18 having a receiving pipe 15 fitted to the rear end with a sliding piece 14 fixed to the rear end is also slidably fitted into the other groove of the guide tube 2. It is also biased rearward by a return spring 16 interposed between the front surface and a spring receiver 82 that abuts the step at the front end of the groove of the guide cylinder. Note that a ballpoint pen impact buffer spring 17 is housed inside the receiving pipe 15. The rear end of the sliding piece 14 of the ballpoint pen 18 is positioned in contact with the rear end wall of the groove of the guide cylinder 2. A cylindrical cam 22 having a relatively steep inclined surface 21 circumferentially provided on the front surface of the cylindrical body is fitted into the rear outer circumferential portion of the guide cylinder 2 . A notch (not shown) is provided at the tip of the cylindrical cam 22, and a protrusion (not shown) having a slope with the same slope as the slope 21 of the cylindrical cam 22 is provided at the rear of the sliding pieces 4, 14.
The guide cylinder 2 is fixed and the cylindrical cam 2 is
When rotating the sliding pieces 4 and 14, the cylindrical cam 2
The sharp pencil 1 and the ballpoint pen 18 alternately move forward or backward by sliding on the slopes of the two.

A collar (not shown) is provided on the inner surface of the cylindrical cam 22, and a groove is provided in the circumferential direction on the outer surface of the rear end of the guide cylinder 2, and the collar fits into the groove. The groove of this guide cylinder 2 is provided with a circumferential length (not shown) so that the collar, that is, the cylindrical cam 22 can rotate within a range of approximately 180 degrees. 1 base 26 is the tip shaft 2
The tip of the ballpoint pen 18 protrudes from the tip opening of the ballpoint pen 18 at the limit of left rotation. Furthermore, the guide cylinder 2 is provided with a groove in the axial direction perpendicular to the groove in the circumferential direction when the sharp pencil 1 is projected, that is, at the right rotation limit position. By clicking the crown 76, it can be moved back and forth. In the illustrated state, the sharpening pencil 1 is in a protruding state, and the sliding piece 4 is engaged with the notch of the cylindrical cam 22.
When the crown 76 for the knock cover is knocked in this state, the cylindrical cam 22 moves forward as described above, and the sharp pencil 1 also moves forward via the sliding piece 4. After it comes into contact with the inner step of the core and is prevented from moving in that state, the internal chuck mechanism (not shown) moves to feed out the core. When the knob pressure on the crown 76 for the knob cover is released, the sharp pencil 1 is released from the payout spring 28 and the return spring 6.
It returns to its original state due to its restoring power. In other words, by repeating the above operations, the lead is gradually drawn out. Next, when the cylindrical cam 22 is rotated to the left rotation limit, the ballpoint pen 18 will protrude.At this time, the collar of the cylindrical cam 22 will be prevented from moving in the axial direction with respect to the guide tube 2, so let's knock the crown 76 for the knock cover. However, it is still in a locked state. By the way, a locking pipe 30 is inserted into the rear end of the cylindrical cam 22, and a locking projection 3 provided on the locking pipe 30 is inserted into the rear end of the cylindrical cam 22.
1 is fitted and locked into a window 32 provided on the cylindrical cam 22. The rear end portion of the guide tube 2 is located inside the knob pipe 30. A funnel portion 33 is integrally formed at the rear end of the guide tube behind the hole 9 described above. The funnel portion 33 is formed in such a manner that a large diameter portion 38 and a small diameter portion 39 intersect, and the large diameter portion 3
When the eraser 37 is attached to the guide tube 8, the small diameter portion 39 becomes approximately half-moon shaped and is configured to communicate with the hole 9 of the guide tube 2. The rear end of the funnel part 33 protrudes from the rear end of the knock pipe 30, and
A knock cover 41 having a crown 76 for the knock cover attached to the rear end is removably fitted onto the outer periphery of the knob pipe 30, and its front end is connected to the rear end of the cylindrical cam 22 via a rigid washer 42 and an elastic body 43 such as rubber. are in contact. A funnel cover 46 is fitted to the rear end of the funnel portion 33 of the guide tube 2, and the large diameter portion 3
The rear end of the funnel part 33 is closed except for the hole provided at the rear end position of the funnel part 8. That is, the small diameter part 3 of the funnel part
The rear end of 9 is closed. Large diameter part 38 in funnel part 33
The reason for providing the small diameter portion 39 is as follows. In order for the mechanical pencil 1 and the ballpoint pen 18 to appear and disappear alternately, each writing body moves back and forth, but in the case of the mechanical pencil 1 in particular, a spare refill is provided behind the writing lead held in the chuck. When the writing lead and the refill are located in a straight line, in that case, when the sharp pencil 1 moves back to switch with the ballpoint pen 18, the rear end of the writing lead hits the front end of the refill. In this case, if the eraser is arranged at the rear of the refill as in the above-mentioned known example, there is no place for the refill to escape, and the refill will be pushed backwards. To prevent this, in the structure of the above-mentioned known example, there is a space in front of the eraser that is sufficiently long so that the refill will not be pinched even if the writing lead is retracted. It was necessary to provide a
In order to solve this problem, a large diameter part 38 and a small diameter part 39 are provided so that even if there is an eraser, the refill can escape to the side. Next, guide tube 2
The fixing structure of the front shaft 27 is as follows. That is,
As shown in the figure, the guide tube 2 has a protruding collar 83 on the side surface of the front portion, and this collar 83 forms a notch provided at the rear end edge of the joint tube 58 located on the outer periphery of the front end of the guide tube 2. While fitting with 84, the joint cylinder 5
The washer 52, which is positioned in contact with the front end of the cap inner cylinder 53, is in contact with the rear end of the collar 83, and the washer 51 and the spring washer 5 are in contact with the front end of the collar 83.
Further, the rear end of the decorative ring 55 press-fitted into the inner surface of the front end of the cap 56 contacts the front end of the spring washer 54 to restrict the axial position of the guide tube 2 relative to the cap 56. The connecting cylinder 58 and the guide cylinder 2 are inserted into the decoration ring 55, the spring washer 54, and the washer 51, and the notch 84 of the connecting cylinder 56 located on the outer periphery of the front end of the guide cylinder 2 fits into the collar 83, thereby connecting the connecting cylinder 58 and the guide cylinder 2.
The rotation in the circumferential direction of the joint tube 5 is integrated, and the
The locking protrusion 86 provided on the guide tube 2 fits into the locking hole 85 provided in the guide tube 8 , and the guide tube 2 becomes unable to move in the axial direction with respect to the joint tube 58 .
and a joint cylinder 58 are integrally fixed, and this joint cylinder 5
8 is inserted into the tip shaft 27 and the rib 59 provided on the joint tube 58 presses against the inner surface of the tip shaft 27 with moderate friction, so that the guide tube 2 is attached to the tip shaft 27 via the joint tube 58. It is removably fixed. Next, the cap 56 has an axially long fitting protrusion 60 protruding from its inner surface, and this fitting protrusion 60 fits into the inside of the cap through a cutout (not shown) provided in the cap inner cylinder 53. Cap inner cylinder 53
At the same time, the cylindrical cam 2 is fitted into the axially long fitting groove 61 provided on the cylindrical cam 22.
2 is free to move in the axial direction with respect to the cap 56, but rotation in the circumferential direction is unified. Therefore, when the cap 56 is rotated, the cylindrical cam 22 is also rotated integrally to switch between the sharp pencil 1 and the ballpoint pen 18, and with the tip of the sharp pencil 1 protruding from the shaft tip opening, the crown 76 for the knob cover is opened. When the cylindrical cam 22 is knocked forward, the cylindrical cam 22 moves forward relative to the cap 56 and the lead is fed out. When refilling refills from the rear, remove the eraser 37 together with the eraser stopper 80 from the funnel cover 46 of the funnel portion 33 of the guide tube 2.
The bottom surface of the large diameter portion 38 is tapered, as the name suggests, to facilitate insertion of the refill.

In the figure, 71 is a pipe relay part, 72 is a sharp shock buffer spring, 73 is a core guide piece, and 74 is a pipe relay part.
75 is a crown for a cap, 76 is a crown for a knock cover, 77 is a clip, and 78 is a clip fixing ring.

As mentioned above, the present invention has a hole in the rear part of the guide tube, in which the core pipe can freely slide, at a position behind the groove in which the sharp pencil is fitted, and a funnel part provided at the rear end of the guide tube. It is characterized by having a large diameter part that accommodates the eraser and a small diameter part that communicates with the hole next to the large diameter part, so that when the sharp pencil is switched to a ballpoint pen and retreats, even if the writing lead is held in the chuck. Even if the eraser comes into contact with the refill, there is a small diameter part where the refill can escape, so there is no need to worry about the lead breaking.Also, this small diameter part is provided next to the large diameter part that accommodates the eraser, so the axial length can be extended. This is unnecessary and has the effect of eliminating disadvantages such as impairing the external design and usability.

[Brief explanation of drawings]

The figure is a sectional view of an embodiment of the dual-action writing instrument of the present invention. 1...Sharp pencil, 2...Guide tube, 3
... Core pipe, 4 ... Sliding piece, 5 ... Locking part,
6...Return spring, 8...Guide tube stepped portion, 9...Guide tube hole portion, 14...Sliding piece, 1
5... Reception pipe, 16... Return spring, 17... Ballpoint pen impact buffer spring, 1
8... Ballpoint pen, 21... Slope, 22... Cylindrical cam, 26... Base, 27... Lead shaft, 28... Feeding spring, 30... Knot pipe, 31
... Locking protrusion, 32 ... Window section, 33 ... Guide tube funnel section, 37 ... Eraser, 38 ... Large diameter section, 39
... Small diameter part, 41 ... Knot cover, 42 ... Rigid washer, 43 ... Elastic body, 46 ... Funnel cover, 51 ... Washer, 52 ... Washer, 53 ... Cap inner cylinder, 54 ... Spring washer Yar, 55... Decorative ring, 56... Cap, 58... Tip shaft joint tube, 59... Rib, 6
0... Fitting protrusion, 61... Fitting groove, 71... Pipe relay part, 72... Sharp impact buffer spring, 73... Core guide piece, 74... Mounting part, 7
5... Crown for cap, 76... Crown for knob cover, 77... Clip, 78... Clip fixing ring, 80... Eraser stopper, 81, 82...
... Spring receiver, 83 ... Flange, 84 ... Notch, 85 ... Locking hole, 86 ... Locking protrusion.

Claims (1)

[Scope of utility model registration request] A sharp pencil and a ballpoint pen, each having a fixed sliding piece, are slidably fitted into an axial groove provided in a guide tube that fixes the pen to the tip, and a cam slope is provided on the outer periphery of the guide tube. A cylindrical cam is attached to the guide cylinder so that it can rotate and move in the axial direction, and the cap and the cylindrical cam are integrated in the rotational direction at the inner diameter of the cap, and the cam slope of the cylindrical cam is attached to the sliding piece. When the cap or cylindrical cam is brought into contact and rotated, the sliding piece is configured to move on the cam slope, and the rear end of the core pipe of the sharp pencil is opened to protrude long rearward from the sliding piece, and the above-mentioned guide A hole slightly larger than the outer diameter of the core pipe is provided at the rear of the groove in which the sharp pencil is fitted in the rear part of the cylinder, and the rear end of the core pipe is inserted into the hole to allow the sliding piece to move back and forth. At this time, the rear end of the core pipe is made slidable within the hole, and a funnel portion is provided at the rear end of the guide tube, and the funnel portion has a large diameter portion for accommodating the eraser and communicates with the hole portion next to the large diameter portion. A double writing instrument characterized by having a small diameter section.