JPH0353908Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to writing instruments such as sharp pencils and ballpoint pens, and in particular, the present invention is related to writing instruments such as sharp pencils and ballpoint pens. This writing instrument relates to a double-knock writing instrument which can be pushed out from the tip of a cylinder and retracted by the second knock operated against a retraction spring.

[Conventional technology]

The double-knock mechanism of this type of conventional writing instrument has a structure as shown in FIGS. 6 and 7a and 7b, for example.

In FIGS. 6 and 7a and 7b, 3 is a writing shaft housed within the outer cylinder 2. Reference numeral 14 denotes a cylindrical cam fitted or formed on the inner surface of the rear end of the outer cylinder 2. This cylindrical cam 14 has, for example, three axial protrusions 15 formed at equal angles on the inner periphery of the rear part, and each of the protrusions A shallow groove 16a is formed in the strip 15, and a valley 17 is provided at the tip of each protruding strip 15.

Reference numeral 4 denotes a knock portion consisting of a knock cam 18 and a knock rod 19. The knock cam 18 is provided with six axial protrusions 20 on the outer periphery of the cylinder, which are fitted into the deep grooves 16b formed between the shallow grooves 16a and the protrusions 15 of the cylindrical cam 14, and the ends of the protrusions 20 on the cylindrical end. Peaks 21 and valleys 22 are alternately formed so that the peaks become peaks, and the knock rod 19 protrudes from the rear end of the outer cylinder 2.

23 is a rotating cam fitted to the rear end of the writing shaft 3, and this rotating cam 23 has a cylindrical cam 14 on the outer periphery of the cylinder.
An axial protrusion 24 is provided to be fitted into each of the deep grooves 16b, and ridges 25 and valleys 26 are alternately formed at the rear end of the cylinder so that the end of each protrusion 24 forms a peak.

When the knock rod 19 is retracted and knocked against the spring (see Fig. 1), the rotating cam 23 and the writing shaft 3, which are slightly shifted from the slopes of the ridges 21 of the knock cam 18 and contact the slopes of the ridges 25, are moved. Pushed against the retraction spring, each protrusion 24 of the rotary cam 23 separates from each deep groove 16b of the cylindrical cam 14 from the state shown in FIG. 7a. At this time, since the slopes of the respective peaks 25 of the rotating cam 23 are in pressure contact with the slopes of the respective peaks 21 of the knock cam 18 due to the spring force of the retraction spring, the rotating cam 23
rotates, and the peaks and valleys of both sides engage. Next, the slopes of each peak 25 of the rotating cam 23 are pressed against the slopes of each valley 17 of the cylindrical cam 14, and the rotating cam 23 further rotates, so that each peak 25 of the rotating cam 23 contacts the cylindrical cam as shown in FIG. 7b. 14, each valley 17 is engaged. The tip of the writing shaft 3 is thereby held in a state where it is pushed out from the tip of the outer cylinder 2.

When the knock rod 19 is retracted and knocked against the spring in the state shown in FIG. 7b, the knock cam 1
The rotating cam 23 and the writing shaft body 3 which are in contact with the slopes of the respective peaks 25 with a slight deviation from the slopes of the respective peaks 21 of 8 are pushed against the retraction spring, and the respective peaks 25 of the rotating cam 23 are pushed against the retraction spring.
The rotary cam 23 is rotated by separating from each valley 17 of the cylindrical cam, and the rotating cam 23 and each peak and valley of the knock cam 18 are engaged with each other. Next, the rotating cam 23
The rotating cam 23 rotates as the slopes of the ridges 25 press against the slopes of the valleys 17 of the cylindrical cam 14 due to the spring force of the retracting spring, and the protrusions 24 of the rotating cam 23 rotate as shown in FIG. 7a. The knock rod 1 having the knock cam 18 is pushed into each deep groove 16b of the cylindrical cam 14 as shown in FIG.
9 is pushed back and the tip of the writing shaft 3 is retracted from the tip of the outer cylinder 2.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional writing instruments, a cylindrical cam with a complicated shape is used as a double knock mechanism.
4. Since a mechanism consisting of a knock rod 19 having a knock cam 18 and a rotary cam 23 is used, there are problems such as the structure is complicated, it is not easy to assemble, it is expensive, and it is easy to break down.

[Means for solving problems]

In order to solve the above problems, the writing instrument of this invention
As shown in the first and fourth figures, the writing shaft 3 is inserted into the outer cylinder 2, and the notch part 4 protruding from the rear end of the outer cylinder 2 is pulled in and knocked against the spring 5. Push out the tip 6 of the writing shaft body 3 from the tip of the outer cylinder and hold it, and then knock the notch part 4 again against the retraction spring 5, so that the tip 6 of the writing shaft body 3 is pushed out by the spring force of the retraction spring 5. In a retractable double-knock writing instrument, a ratchet gear 8 is pivotally installed inside the outer cylinder 2 or within the lateral protrusion 7 of the outer cylinder 2 so that the tips of the teeth protrude into the outer cylinder 2, and each time the ratchet gear is clicked, First spring pawls 10 and 1 rotate the ratchet gear 8 a predetermined number of times each time the ratchet gear 8 is rotated.
A second spring claw 11 that engages with the ratchet gear 8 at the end of the second notching is provided on the writing shaft 3 or the notch portion 4 so that the claw tips thereof face each other, and a blocking claw 12 is provided to prevent the ratchet gear 8 from rotating in the opposite direction. The tooth 8 has an inclined tooth surface 13 so as not to mesh with the second spring pawl 11 every time the second knock is completed.

[Effect]

When the knob 4 is pushed against the retraction spring 5 and the push is started, the writing shaft 3 and the first and second spring claws 11 and 12 are moved. At this time, the second spring pawl 11 does not mesh with the ratchet gear 8, but is tilted down and passes under the ratchet gear 8 as shown in FIG. 5b.

When pressed further, the first spring claw 10 moves to the fifth
As shown in FIG. 5C, it comes into engagement with the ratchet gear 8, rotates the ratchet gear 8 by a predetermined angle, and then passes under the ratchet gear 8 as shown in FIG. 5D.

When the push button is loosened, the spring force of the retraction spring 5 causes the writing shaft 3, the first and second spring claws 10, 1
1 and the notch portion 4 are pushed back, and the second spring pawl 11 hits and engages with the ratchet gear 8 as shown in FIG. Rotate ratchet gear 8
is fixed and cannot be rotated.

As a result, the writing shaft 3 and the knob portion 4 are stopped with the ratchet gear 8 and the second spring pawl 11 engaged, and the tip 6 of the writing shaft 3 is pushed out from the tip of the outer cylinder 2. Retained.

When retracting the tip 6 of the writing shaft 3, push the knob portion 4 again against the retraction spring 5, and the writing shaft 3 and the first and second spring claws 10,
11 is moved, and the first spring claw 10 is moved as shown in FIG.
After hitting and engaging the ratchet gear 8 as shown and rotating the ratchet gear 8 by a predetermined angle,
It passes under the ratchet gear 8 as shown in FIG. 5g.

When the push button is loosened, the spring force of the retraction spring 5 causes the writing shaft 3, the first and second spring claws 10, 1
1 and the notch portion 4 are pushed back, and the second spring pawl 11 hits the ratchet gear 8, causing the gear 8 to
However, the blocking pawl 12 prevents the ratchet gear 8 from rotating in the reverse direction, and the second spring pawl 11 prevents the ratchet gear 8 from rotating as shown in FIG. 5h.
It slides on the inclined tooth surface 13 of and passes under it.

As a result, the writing shaft body 3, the first and second spring claws 1
0, 11 and the notch portion 4 are pushed back by the spring force of the retraction spring 5 as shown in FIG. Become.

〔Example〕

FIG. 1 is a longitudinal sectional view showing one embodiment of the writing instrument of the present invention, and shows an example of a sharp pencil. Figure 2a,
b is a front view of a ratchet gear and a perspective view of a pipe having first and second spring claws used in the present invention, and FIG. 3 is a perspective view of a clip in which the ratchet gear and blocking claw are assembled, respectively.

First, the structure of this mechanical pencil will be explained.

In FIG. 1, reference numeral 2 denotes an outer cylinder, which has a clip 1 at its rear end. 3 is a writing shaft inserted into this outer cylinder 2. In the case of this sharp pencil, the writing shaft 3 moves the lead tank 27 in the axial direction against the knob spring 28 or by the force of the spring. The chuck 30 fitted to the chuck ring 29 is opened and closed, the lead in the lead tank 27 is fed out from the chuck 30 by a predetermined length, and the lead is fed out by a predetermined length from the tip 6 of the tip 31a of the inner cylinder 31. It's summery.

Reference numeral 4 designates a notch portion fitted to the outer periphery of the rear end of the lead tank 27 constituting the writing shaft 3, and protrudes from the rear end of the outer cylinder 2. 32 is an eraser fitted on the inner periphery of the rear end of the lead tank 27, and 5 is a retraction spring that restricts the writing shaft 3 to the rear of the outer cylinder 2.

A ratchet gear 8 is disposed within the base end space 7 of the clip 1, and is pivotally supported by a gear shaft 9 on both side walls. Reference numeral 12 denotes a blocking claw that prevents reverse rotation of the ratchet gear 8, and its base end is fixed to the inner surface of the clip 1 by spot welding or the like.

A clip attachment hole 33 is formed on the rear end side of the outer cylinder 2, and both side walls of the proximal end of the clip 1 with the ratchet gear 8 and blocking pawl 12 assembled therein are attached to the clip attachment hole 33. During the installation, one of the mounting pieces 34a and 34b formed at the front and back of the lower part of both side walls of the clip 1
4a, insert both side walls of the clip 1 into the clip mounting hole 33, and then attach the mounting piece 34a.
By unbending the clip mounting hole 33
Attach to. Attachment of the clip 1 may also be achieved by other means.

10 turns the ratchet gear 8 every time you knock.
The first spring pawl 11 rotates by 45 degrees and is the second spring pawl that engages with the ratchet gear 8 when the first notching is completed. provided. For example, the pipe 35 is cut and raised so that the toes thereof face each other to form both claws 10 and 11, and the pipe 35 is fitted into the lead tank 27 of the writing shaft 3.

The ratchet gear 8 has a total of 8 teeth arranged at 45° intervals, and every other tooth has an inclined tooth surface 1 so as not to mesh with the second spring pawl 11 at the end of the second notch.
3.

FIG. 4 is a vertical sectional view showing another embodiment of the writing instrument of the present invention, and shows an example of a ballpoint pen.

In the case of this ballpoint pen, the writing shaft 3 is a refill. A ball 3 is attached to the tip 6 of this writing shaft body 3.
6 is rotatably held, and the writing shaft 3 has the same structure except that ink is stored in the writing shaft 3.

Next, the operation of the writing instrument of the present invention will be explained for a sharp pencil and a ballpoint pen.

FIG. 5a shows a state in which the tip 6 of the writing shaft 3 is retracted from the tip of the outer cylinder 2.

In this state, when the knob portion 4 is pushed against the retraction spring 5 and the push is started, the writing shaft 3 and the first and second spring claws 11 and 12 are moved. At this time, the second spring pawl 11 does not mesh with the ratchet gear 8, but is tilted down and passes under the ratchet gear 8 as shown in FIG. 5b.

When pressed further, the first spring claw 10 moves to the fifth
As shown in FIG. 5C, it comes into contact with the ratchet gear 8, and after rotating the ratchet gear 8 by 45 degrees, it passes under the ratchet gear 8, as shown in FIG. 5D.

When the push button is loosened, the spring force of the retraction spring 5 causes the writing shaft 3, the first and second spring claws 10, 1
1 and the notch portion 4 are pushed back, and the second spring pawl 11 hits and engages with the ratchet gear 8 as shown in FIG. Rotate ratchet gear 8
is fixed and cannot be rotated.

As a result, the writing shaft 3 and the knob portion 4 are stopped with the ratchet gear 8 and the second spring pawl 11 engaged, and the tip 6 of the writing shaft 3 is pushed out from the tip of the outer cylinder 2. Retained.

If you use a ballpoint pen, you can write in this state.

In the case of a sharp pencil, when the notching operation of the notching part 4 is performed in this state, the lead tank 27 of the writing shaft 3 moves in the axial direction against the notching spring 28 or by its spring force, and the chuck ring 29 moves in the axial direction.
The chuck 30 fitted to the core tank 27 opens and closes.
Feed out the inner core by a predetermined length from the chuck 30,
The lead can be sent out by a predetermined length from the tip 6 of the writing shaft body 3.

When retracting the lead, the chuck 30 is brought into an open state by keeping the knock part 4 in the knocked state against the knock spring 28, so that the lead can be retracted by pushing the tip.

When retracting the tip 6 of the writing shaft body 3, the fifth
In the state shown in Figure e, when the knob part 4 is retracted and pushed against the spring 5, the writing shaft body 3 and the first and second spring claws 10, 11 are moved, and the first
The spring pawl 10 hits and engages with the ratchet gear 8 as shown in FIG.
After rotating by 45 degrees, it passes under the ratchet gear 8 as shown in Figure 5g.

When the push button is loosened, the spring force of the retraction spring 5 causes the writing shaft 3, the first and second spring claws 10, 1
1 and the notch portion 4 are pushed back, and the second spring pawl 11 hits the ratchet gear 8, causing the gear 8 to
However, the blocking pawl 12 prevents the ratchet gear 8 from rotating in the reverse direction, and the second spring pawl 11 prevents the ratchet gear 8 from rotating as shown in FIG. 5h.
It slides on the inclined tooth surface 13 of and passes under it.

As a result, the writing shaft body 3, the first and second spring claws 1
0, 11 and the notch portion 4 are pushed back to their original positions by the spring force of the retraction spring 5 as shown in FIG. Become.

In this embodiment, since the ratchet gear 8 is pivotally installed using the base end space 7 of the clip 1, it is possible to reduce the diameter of the outer cylinder 2.

The present invention is a writing instrument in which a rolling prevention part is protruded from the side of the outer cylinder 2, and this rolling prevention part prevents the writing instrument from rolling, and a ratchet gear 8 is pivotally installed in the rolling prevention part. Alternatively, the ratchet gear 8 may be pivotally supported within the outer cylinder 2.

[Effect of idea]

As is clear from the above description, according to the present invention, a mechanism consisting of the ratchet gear 8, the first and second spring pawls 10, 11, and the blocking pawl 12 is used as the double knock mechanism, so that it is compared to the conventional writing instrument described above. The structure is simple, assembly is easy and inexpensive, and failures can be extremely reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the writing instrument of the present invention, and FIGS. 2a and 2b are respectively a front view of a ratchet gear used in the present invention and a perspective view of a pipe having first and second spring claws. Fig. 3 is a perspective view of the clip with the ratchet gear and blocking pawl assembled, Fig. 4 is a vertical sectional view showing another embodiment of the writing instrument of the invention, and Figs. 5 a to h are for explaining the operation of the writing instrument of the invention. FIG. 6 is a longitudinal sectional view of a double-knock mechanism in an example of a conventional writing instrument, and FIGS. 7a and 7b are developed views for explaining its operation. DESCRIPTION OF SYMBOLS 1... Clip, 2... Outer tube, 3... Writing shaft, 4... Knot part, 5... Retraction spring, 6...
... Tip, 7 ... Base end space, 8 ... Ratchet gear, 9 ... Gear shaft, 10 ... First spring claw, 1
1... Second spring claw, 12... Blocking claw, 13...
...Slanted tooth surface.

Claims (1)

[Claims for Utility Model Registration] The writing shaft 3 is inserted into the outer cylinder 2, and the notch portion 4 protruding from the rear end of the outer cylinder 2 is pulled in and clicked against the spring 5. The tip 6 of the writing shaft body 3 is pushed out from the tip of the outer cylinder 2 and held, and the notched part 4 is knocked again against the retraction spring 5, so that the tip 6 of the writing shaft body 3 is pushed out by the spring force of the retraction spring 5. In a retractable double-knock writing instrument, a ratchet gear 8 is pivotally installed inside the outer cylinder 2 or within the lateral protrusion 7 of the outer cylinder 2 so that the tips of the teeth protrude into the outer cylinder 2, and each time the ratchet gear is clicked, First spring pawls 10 and 1 rotate the ratchet gear 8 by a predetermined angle each time the ratchet gear 8 is rotated.
A second spring claw 11 that engages with the ratchet gear 8 at the end of the second notching is provided on the writing shaft 3 or the notch portion 4 so that the claw tips thereof face each other, and a blocking claw 12 is provided to prevent the ratchet gear 8 from rotating in the opposite direction. The double-knock type writing instrument has teeth 8 having inclined tooth surfaces 13 so as not to engage with the second spring claw 11 every time the second knock is completed.