JPH0397598A - Shake-out type propelling pencil - Google Patents

Abstract

PURPOSE:To obtain the title propelling pencil capable of performing writing by simple operation by moving a lead guide to the foremost advance position by the inertial force due to the shaking of a shaft cylinder to open a chuck. CONSTITUTION:A lead guide 10 has a wt. possible to advance when a shaft cylinder 7 is shaken and, when the lead guide 10 is pressed to a paper surface, the lead guide 10 and lead 5 recede slightly and a lead following pipe 13 becomes a state separated from the inner stage 1A of a chuck 1 and the chuck 1 is energized rearwardly by a spring 3 to obstruct the retraction of the lead 5. In this state, writing is performed and the lead guide 10 recedes with the abrasion of the lead 3 and the lead guide 10 advances by the inertial force of its wt. by shaking the shaft cylinder 7 when the lead 5 is abraded by definite quantity but the lead 5 held by a lead holder 11 also advance. When the lead guide 10 moves to the foremost advance position, the lead following pipe 13 comes into contact with the inner stage 1A of the chuck 1 to open the chuck 1 and, when the lead 5 becomes short during use, the next lead 5 is allowed to follow under its own wt.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is a knock-type mechanical pencil whose lead is drawn out by pressing the knob. This invention relates to the knob shape of a knock-type mechanical pencil with an outer rim.

[Conventional technology]

A swing-out mechanical pencil in which the lead moves backwards and the inertia caused by swinging the shaft advances the lead guide to feed out the lead, and when the lead guide is at the frontmost position, the chuck is expanded to follow the next lead one after another. Regarding.

[Conventional technology]

Conventionally, the lead was automatically fed out by the amount of wear on the lead, and
As for a mechanical pencil in which the next lead can automatically follow when the lead of a book becomes short, there is a previously filed application by the present applicant in Japanese Utility Model Application No. 62-73984. This is because the lead guide is urged forward by the spring, and when the lead guide is pressed against the paper, it retreats as the lead wears out, and when the lead guide is separated from the paper, the elastic force of the spring causes the lead guide to move forward and remove the lead. This is an automatic lead-feeding mechanical pencil that expands the chuck when the lead guide is positioned forward and follows the next lead in sequence.

[Problem to be solved by the invention]

However, in the above-described method, the chuck opens every time the lead guide is separated from the paper surface, so that when the lead and the lead guide are pressed against the paper surface, a slight retraction occurs, making it extremely difficult to write.

[Means to solve the problem]

The present invention eliminates the spring that biases the core guide forward, and normally the core guide retreats as the core wears.
When the core guide retreats by a certain amount, by shaking the barrel, the core guide is moved to the most advanced position by the inertia force generated by the gravity of the core guide itself or the gravity of the weight body, and the chuck is expanded.

〔Example〕

The present invention will be explained based on the drawings. First, the embodiment shown in FIG. 1 will be described. Two halves are put together to form a chuck 1, and a ball 2 is rotatably attached to the concave portion of the chuck 1. The chuck 1 is urged backward by the spring 3 and presses the ball 2 against the tapered surface of the fastener 4, and the wedge action of the ball 2 and the fastener 4 closes the chuck 1, allowing the core 5 to move forward but not backward. 4i1 precepts for blocking core holding devices. The fastener 4 of this core holding device is installed inside the connecting tool 6, and the connecting tool 6 is fixed to the shaft tube 7. A core guide tube 9 urged rearward by a front spring 8 is provided in the front portion of the connector 6 and pressed against the front end of the chuck 1. A front part 1 protrudes from the front part of the shaft cylinder 1 and protects the core 5.
0A and the core storage chamber 7 of the shaft tube 7 located behind the core holding device.
A rear portion 10B that guides the core 5 in A into the core holding device is connected by an intermediate portion 10C to form a core guide 10.

Moreover, as shown in FIG.
A through window 10D is formed extending in the longitudinal direction of C, and the protrusion i16A of the connector 6 is inserted through the through window 10D, so that the core guide 10 can be slid within the shaft cylinder 7 as appropriate. has been done. A lead holder 11 that holds the lead 5 with an appropriate force is built into the front part 10A of the lead guide IO, and the rear part of the inner vibe 12 provided in the lead holder 11 is inserted into the front part 9A of the lead guide tube 9. It has been inserted. Incidentally, the lead holder does not necessarily have to be constructed separately from the lead guide, and there is no problem if it is formed integrally with a part of the lead guide made of synthetic resin, as is conventionally known. Furthermore, a core follower tube 13 is fixed to the rear of the core guide 10 so as to protrude forward, and the core follower tube 13 is inserted into the chuck 1 from the rear. Moreover, when the core guide 10 is located at the frontmost position as shown in FIG. 1, the core follower tube 13 contacts the inner stage IA of the chuck 1 and expands the chuck 1 appropriately. Moreover, the core guide 10 is the shaft cylinder 7.
It is constructed with an appropriate weight so that it can move forward when swung. The rear part of the shaft tube 7 is opened so that the lead 5 can be inserted therein, but normally the eraser 1 is inserted into the opening 7B.
4 is attached and further covers the eraser 14.
5 is removably attached to the rear of the shaft tube 7 to constitute a swing-type mechanical pencil.

Next, to explain the writing operation with the swing-out mechanical pencil shown in Figure 1, first, in the state shown in Figure 1, the lead guide 1
0 is pressed against the paper surface, the core guide 10 and the core 5 move back slightly. Then, after core guide 10! The core follower tube ■3, which is shaped by liE10B, is separated from the inner stage IA of the chuck 1 and becomes the state shown in Fig. 3, and the chuck 1 is urged backward by the spring 3, and a wedge action acts to prevent the core 5 from retreating. prevent. Writing is performed in this state, and as the lead 3 wears out, the lead guide 10 retreats. When the core 5 wears out a certain amount, by shaking the shaft cylinder 7, the core guide I
O moves forward due to inertia generated by its own weight. At this time, the lead 5 held by the lead holder 2 also moves forward together with the lead guide 10. When the core guide 10 moves to the most advanced position, the core follower tube 13 of the core guide 10 comes into contact with the inner stage IA of the chuck 1, and the chuck 1 is expanded to return to the state shown in FIG. If the lead 5 in use becomes shorter at this time,
The next core 5 is followed inside the chuck 1 by its own weight.

FIG. 4 shows another embodiment of the present invention, in which a weight body 16 is slidable within a shaft cylinder 107 by a certain distance in the longitudinal direction.
is fitted loosely so that the weight body 16 can come into contact with the rear part 10B of the core guide IO. Incidentally, since the core guide tube and the inner vibrator described in the embodiment of FIG. 1 are not necessarily required, this embodiment has been described with the structure omitted.

In the case of FIG. 4, when the core guide 10 retreats a certain distance, the weight body 16 moves forward in the longitudinal direction by shaking the shaft cylinder 107, and the weight body 16 moves to the rear part 10B of the core guide 10. The core guide 10 is moved forward by the inertial force of the weight body 16.

In addition, as shown in FIG. 5, the inner stage 107C of the shaft cylinder 107
A return string 17 is stretched between the outer stage 116A of the weight body 116 and the normal weight body 116 is urged rearward. Therefore, in this case, unnecessary movement of the weight body 1l6 can be prevented even if vibration occurs when the device is carried.

Next, an embodiment of a configuration for reliably stopping the core guide at the most advanced position will be described.

FIG. 6 shows an elastic body inside the barrel 207 of a swing-out mechanical pencil in which the lead guide moves forward by its own inertia.
8 is attached, and the elastic body 18 and the core guide 10 are frictionally connected with a force stronger than the elastic force of the spring 3 which urges the chuck 1 backward.

FIG. 7 shows a swing-out mechanical pencil in which the lead guide 10 is advanced by the inertia of a weight body 16 that is slidably built in the barrel 107 in the longitudinal direction, and an elastic body l8 is attached inside the barrel 107. The elastic body 18 and the core guide 10 are frictionally connected with each other with a force stronger than the elastic force of the spring 3 which urges the chuck l backward.

FIG. 8 shows an elastic O in the rear groove 110E of the core guide 110.
Fit the ring 19 on the outside, and attach the elastic ring 19 to the shaft cylinder 307.
It is frictionally connected to the inner surface 307D of the chuck 1 with a force stronger than the elastic force of the spring 3 which urges the chuck 1 backward.

FIG. 9 shows that an elastic body 118 having a groove 118A is attached to the inside of the shaft tube 407, and a protrusion 210F is formed on the rear part 210B of the core guide 210, so that when the core guide 210 is located at the frontmost position, the core The protrusion 210F of the guide 210 is engaged with the groove 118A of the elastic body 118 with a force stronger than the elastic force of the spring 3 that biases the chuck 1 backward.

In the embodiment shown in FIG. 9, the connector 106 built into the shaft tube 407 is biased forward by the writing pressure spring 20, which is set to be stronger than the writing pressure, and the lead 5 and the lead guide 210 are subjected to unnecessary pressure. A core breakage prevention mechanism is added that allows the core 5 to retreat when force is applied, but this mechanism can be added to any of the embodiments to provide the same effect.

In the embodiments shown in FIGS. 6 to 9 described above, since the chuck is always expanded when the lead guide is positioned at the frontmost position, there is an advantage that the next lead can be reliably followed.

In each of the embodiments described above, two pieces are combined to form a chuck, and the inner thigh of the chuck is brought into contact with the core follower tube and expanded, but as shown in FIG. 1
The front end 101B of the core guide tube 109 is shaped like a tapered tapered rearward in the longitudinal direction, and the rear end 109B of the core guide tube 109 that is in contact with the front end 101B of the chuck 101 is connected to the chuck 101.
Like the front end 101B of the chuck 101, the chuck 101 may have a tapered shape narrowing backward in the longitudinal direction, or may be constructed so that it can expand when the chuck 101 moves forward, or, although not shown, the chuck piece may have elasticity. Then, when the chuck moves forward and the wedge action is released, the chuck pieces may expand due to their own elasticity.

Further, the chuck is not limited to one that moves forward by coming into contact with the core guide from the rear, but as shown in FIG. By bringing the inner flange 310G of the core guide 310 into contact with the inner flange 310G of the core guide 310 and moving the chuck 201 forward, there will be no problem in changing the design even if the chuck 201 is expanded.

Moreover, the chuck is not limited to the shape of two pieces; the core holding part of the chuck may be divided into two pieces by providing a plurality of grooves in the longitudinal direction, or the chuck and the fastener The ball provided at the head of the chuck is not necessarily necessary if the wedge action allows the lead to advance but prevents it from retreating.

Furthermore, in order to indicate that the core guide has retreated a certain distance, a circular line 10H is printed on the surface of the core guide 10 as shown in FIG. 12, and when the core guide 10 has retreated a certain amount,
As shown in FIG.
E, it is also possible to provide a step 410I on the surface of the core guide 410 as shown in FIG. 14, or to cut a groove on the surface of the core guide (not shown). It is.

In the case of this embodiment, when the display of the annular line 10H and the step 401I is hidden behind the front end 7E of the shaft tube 7, the shaft tube 7 is shaken to move the core guide to the most advanced position. The last retracted position can be visually confirmed.

〔Effect of the invention〕

The present invention described above moves the core guide forward by shaking the shaft cylinder, and is configured so that the chuck of the core holding device can be expanded when the core guide is fully advanced.
When writing, the lead guide retreats as the lead wears out, allowing you to write. By shaking the barrel, the lead guide moves forward and the lead can be fed out. When the lead guide is at its most forward position, the chuck is expanded and the next It is capable of following the lead, and has the effect of allowing you to write with extremely simple operations.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the dispenser type mechanical pencil of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a writing state in the embodiment of FIG. 1. 4, 5, 6, 7, and 9 are longitudinal sectional views showing other embodiments of the present invention, and FIGS. 8, 10, and 11 are longitudinal sectional views, respectively. Main FiBs each illustrating other embodiments of the invention
1!1 sectional view, and FIGS. 12, 13, and 14 are plan views of main parts showing other embodiments of the present invention, respectively. l・101・201... Chuck 3... Spring 4... Fastener 5... Core 6... Connector?・1 (17, 207, 307, 407... shaft cylinder 10
・110・210・310・410... Core guide l1... Core holder 16/116... Weight body

Claims (1)

[Claims] In knock-type mechanical pencils that feed out leads one by one by moving the lead tank forward, the metal knob manufactured by press processing is formed into a cylindrical shape with a closed top. The knob shape of a knock-type mechanical pencil is characterized in that an outer flange is formed, the knob is removably fitted to the rear part of a lead tank, and the top part of the knob appropriately protrudes from the rear part of the barrel.