JPS6150799B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a writing instrument that can be used both as a sharp pencil and as a ballpoint pen, in which the diameter of the barrel can be reduced.

Conventionally, dual-purpose writing instruments that can selectively eject two types of writing materials, sharp pencils and ballpoint pens, have a difficult structure because they require both a writing material ejection mechanism and a sharp pencil lead feeding mechanism. It is complicated, and therefore it is difficult to reduce the outer diameter of the shaft cylinder, which poses problems not only in terms of design but also inconvenience in portability.

Therefore, the present invention provides a dual-use writing instrument in which a rotary cam presses an actuator attached to the refill of a sharp pencil and a ballpoint pen to selectively protrude two types of writing. A cam for changing the position of the pin is provided, and the rear end of the actuating pin is engaged with this cam, so that its tip can press the rear end of the inner part of the sharpening pencil reflex when it is inserted into the internal hole of the actuator. This provides a dual-use writing instrument with a simple structure and a barrel with a small diameter.

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

The front barrel 1 is a cylindrical body having an opening through which the tips of the sharp pencil refill 2 and the ballpoint refill 3 can selectively protrude during writing, and the tip of the cylinder 4 is removably fitted into the rear end opening. ing. As shown in FIGS. 4 and 5, the cylinder 4 is provided with two opposing cut grooves 41 in the axial direction from its rear end, and a groove 41 for accommodating the core holding cylinder 11 movably in the axial direction. An inner hole 43 having a substantially figure-eight cross section is provided. An annular locking groove 42 having a substantially C-shaped cross section is carved perpendicularly to the axis on the outer circumferential surface near the rear end, with a portion remaining, and is adapted to engage with a protrusion 66 of the rotating cam 6, which will be described later. There is. It goes without saying that, contrary to the illustrated example, a locking groove may be provided on the inner surface of the rotary cam 6 and a protrusion may be provided on the outer surface of the cylinder 4 for engagement. The actuator 5 is slidably engaged with the two cut grooves 41 with the cam follower 51 protruding outward, and therefore the width of the cut groove 41 is larger than the width of the cam follower 51. It is longer than the stroke of actuator 5. The actuator 5 is a cylindrical body having an internal hole 52 and a cam follower 51 protruding from the side.The actuator 5 is a cylindrical body having an internal hole 52 and a cam follower 51 protruding from the side. A tension spring 12 is interposed between the rear end of the actuator 5 and the rear end of the cylinder 4, and the core holding cylinder 11 is urged to move backward with respect to the cylinder 4. There is. As shown in FIG. 7, the rotary cam 6 is cut obliquely from the tip of the cylindrical body to form a mountain shape, and both of these inclined surfaces serve as cam surfaces 61 and collide with the two cam followers 51 that protrude outside the cylinder 4. match.

The apex 67 where both cam surfaces 61 intersect at the tip has a flat shape or a notch shape cut at a gentle angle,
On the other hand, a groove-shaped notch 68 is provided at the portion where both cam surfaces 61 intersect at the rear, and when in the writing state, the cam follower of the actuator 5 is fixed to the lead holding cylinder 11 used for writing. 51 is locked to the apex 67, and at the same time the other cam follower 51 is locked to the notch 67.
8, but because the notch 68 is groove-shaped, it is firmly locked, and during writing, these locks are released and the rotating cam 6 unexpectedly rotates, causing the tips of the refills 2 and 3 to There is no fear that the front cylinder will sink into the front shaft cylinder 1. A protrusion 66 is provided on the rear inner surface of the rotary cam 6 to project inward, and this engages with the locking groove 42 to enable the rotary cam 6 to rotate by a predetermined angle with respect to the cylinder 4 and to move in the axial direction. Make it impossible. And at the rear end is an opening 6 for fitting a knob member 8.
2, and a protrusion 63 for preventing the knob member 8 from rotating protrudes from its inner peripheral surface. A rear shaft cylinder 7 is mounted on the rotating cam 6, and the rear end surface of the front shaft cylinder 1 and the front end surface of the rear shaft cylinder 7 abut each other. At this time, the rotary cam 6 and the rear shaft cylinder 7 are fixed by ordinary means such as adhesion or caulking, and when the rear shaft cylinder 7 is rotated, the rotary cam 6 is rotated. As shown in FIG. 7, the knob member 8 has a flange 81 on the outer peripheral surface, the front part is fitted into the opening 62 of the rotary cam 6, and the rear end head 82 is fitted into the rear end opening 71 of the rear shaft cylinder 7. A compression spring 13 is interposed between the rear end of the rotary cam 6 and the flange 81, and the flange 81 is normally in contact with the inner surface of the rear end of the rear shaft cylinder 7. A rotation stop groove 83 is carved in the axial direction of the outer peripheral surface, and a rotation stop protrusion 63 is formed in this groove.
are engaged with each other, so that the knob member 8 can move in the axial direction with respect to the rotating cam 6, but
Rotation is impossible, and when the rotating cam 6 rotates, the knob member 8 also rotates at the same time. Further, on the outer circumferential surface, a cam surface for changing the position of the actuating pin has an inclination angle equal to or greater than one cam surface 61 of the rotary cam 6, and a length equal to or greater than the stroke of the actuator 5. A recess 85 having a cam surface 84 is provided.
The lower end of the rotary cam 6 is located at the same phase point as the apex 67 of the rotary cam 6, and the cam surface 84 of that portion is perpendicular to the axis and constitutes a pressing portion 86. In addition, an eraser mounting hole may be provided in the head 82, an eraser may be mounted thereon, and a cap may be placed over the eraser mounting hole.
The operating pin 9 is made of a highly rigid wire steel material, and the rear end 1 is bent at a right angle and engages with the cam surface 84, serving as a cam follower. and,
The actuating pin 9 is inserted into the internal hole 52 of the actuator 5, and the tip 92 can press the rear end of the inner part of the sharpening pencil refill 2. The inside of the sharp pencil refill 2 has the same structure as a conventionally known knock-type mechanical pencil, but the refill outer cylinder 21 is connected to the lead holding cylinder 11,
A lid 23 is placed over the rear end of the core case 22 constituting the inner part, and the tip 92 of the actuating pin 9 presses against the surface of the lid 23, but since this surface is processed into a concave shape, it is always Can be pressed in the center. Note that the lid 23 is shaped like a disk and the operating pin 9 is
The core case 22 and the lid 23 are fixed to the tip 92 of the
and may be made free.

In the writing instrument configured as described above, which can be used both as a sharp pencil and a ballpoint pen, when writing with a ballpoint pen, first, the actuator 5 with the ballpoint pen refill 3 attached and fixed to the lead holding tube 11 is moved from the rear shaft tube 7. By rotating, the cam surface 61 of the rotary cam 6 is moved forward, and when the apex 67 of the cam surface 61 is engaged, the tip of the ballpoint pen reflector 3 protrudes from the tip opening of the front barrel 1. At this time, the actuator 5 for the sharp pencil refill 2 moves back and engages with the notch 68 of the rotary cam 6, but the rear end 91 of the actuating pin 9 also moves back along the cam surface 84 of the knob member 8. do. Next, when writing with a sharp pencil, when the rear barrel 7 is reversed, the actuator 5 for the sharp pencil refill 2 advances along the cam surface 61, and the actuator 5 for the ballpoint refill 3 moves forward. retreats along the other cam surface 61,
The apex 67 and notch 6 of the rotating cam 6 respectively
8, the tip of the sharpening pencil refill 2 protrudes from the tip opening of the front barrel 1. At this time, as the rear shaft cylinder 7 is reversed, the knob member 8 also rotates, but the rear end 91 of the operating pin 9 is pushed out by the cam surface 84, and the sharp pencil refill 2
move forward by the same stroke. Then, when the actuator 5 engages with the apex 67, the rear end portion 91 is engaged with the pressing portion 86 of the knob member 8 located in the same phase as the apex 67. Next, to feed out the lead, knock the head part 82 of the knock member 8, and the rear end part 9
1 is engaged with the pressing part 86 perpendicular to the axis, the special pin 9 moves forward, the tip part 92 presses the lid 23 and moves it forward, and the chuck (not shown) moves forward to release the core. Then, the core is drawn out. In addition, in order to load the lead into the lead case 22, it is sufficient to pull out the front barrel 1 from the cylinder 4, remove the outer barrel 21 from the lead holding barrel 11, and remove the lid 23.

As explained above, the present invention provides a cam surface for advancing and retracting the actuating pin on the knock member, and the actuating pin is linear and inserted into the internal hole of the actuator, and its tip presses the inner part of the sharp pencil. This means that the lead ejecting mechanism is housed inside the protruding mechanism of the writing body, and the outer diameter dimension is the same as that of the ejecting mechanism of a conventionally known two-color ballpoint pen. There is no increase in size due to the addition of features. Therefore, the thick barrel barrel, which was a drawback of dual-purpose writing instruments such as sharp pencils and ballpoint pens, has been eliminated, and the external shape is sleek and easy to write with.
You can get a dual-use writing instrument that is convenient to carry.
In addition, since the operating pin is straight, the notch is transmitted straight to the inner part of the sharpening pencil.
It becomes possible to draw out the lead easily. Furthermore, as mentioned above, in many conventional dual-use writing instruments, the writing pressure applied to the sharp pencil chuck was received by the core case, which is the inner tool, but in the present invention, the sharp pencil refill is attached to the refill holding tube. Therefore, the pressure of the pen is received by the outer barrel of the sharp pencil refill via the chuck ring.
Therefore, the more pressure is applied to the chuck, the more clamping force is applied to the chuck, which has the advantage that there is no risk of the lead tip slipping in even with strong writing pressure.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the dual-use writing instrument of the present invention, Fig. 2 is a longitudinal sectional view taken along the line of Fig. 1, and Fig. 3 is a longitudinal sectional view taken along the line of Fig. 1, Fig. 4 is a side view of the cylinder, and Fig. 5 is a longitudinal sectional view taken along the line of Fig. 1. 6 is a perspective view of the rotary cam, FIG. 7 is a perspective view of the knob member, and FIG. 8 is a developed view for explaining the operation. DESCRIPTION OF SYMBOLS 1... Front shaft cylinder, 2... Sharp pencil refill, 3... Ballpoint pen refill, 4... Cylinder, 5... Actuator, 51... Cam follower, 6... Rotating cam, 61... Cam surface, 7... Rear shaft cylinder, 8... Knock member, 84... Cam surface, 9...
...Operating pin, 11... Core holding cylinder, 12... Tension spring, 13... Compression spring.

Claims (1)

[Claims] 1. A front barrel, a rear barrel that is freely rotatable by a predetermined angle with respect to the front barrel, the tip of which is removably fitted to the rear end of the front barrel, and 2 axially extending from the rear end. A cylinder provided with book slots facing each other, and two lead holding cylinders which are housed movably in the axial direction within the cylinder and have a sharp pencil refill and a ballpoint refill attached to their tips, respectively; It is fixed to the rear end of this core holding cylinder,
A cam follower is slidably engaged with the cut groove and protrudes to the outside of the cylinder, an actuator, a spring that acts to move the core holding cylinder backward with respect to the cylinder, and a spring that extends from the tip to both sides. The receding inclined surface is used as a cam surface that abuts against the cam follower of the actuator, and a protrusion provided on either one of the inner surface and the outer surface of the cylinder engages with an annular locking groove provided on the other. A rotary cam is fitted to the cylinder so as to be rotatable by a predetermined angle and not movable in the axial direction, and is fixed to the rear barrel, and a rear end of the rear barrel that rotates together with the rotary cam. a knob member whose head is biased to protrude more and which has a cam surface on its outer surface that is sloped as much as or more than the cam surface of the rotary cam; and a rear end that engages with the cam surface of the knob member. A writing instrument for both a sharp pencil and a ballpoint pen, characterized in that the operating pin is inserted into an internal hole of the actuator and whose tip can press the rear end of the inner part of the sharp pencil refill.