JPH0356387Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a side-knock type sharp pencil equipped with a side-knock mechanism that allows the lead to be advanced by fingertip operation while in the writing position during writing.

[Conventional technology]

Conventional side-knot type sharp pencils of this kind include, for example, a side-knot push button that has a slope at least at the front end and is provided on the peripheral wall of the outer cylinder, and a push button for the side lock that is provided inside the outer cylinder in conjunction with a core pipe that slides in the axial direction. Some devices include a slider fixedly attached to a movably housed reed chuck and slidably in contact with the front end slope of the push button.

In the side-knock type sharp pencil having such a structure, when the push button is pressed, a slide slides on the sloped front end of the push button, thereby moving the lead chuck forward and feeding out the lead.

[Problem that the invention attempts to solve]

In the conventional side-knock type sharp pencil mentioned above, the reciprocal sliding between the push button and the slider, in other words a kind of cam movement, advances the lead chuck and feeds out the lead, which greatly limits the area in which the push button can be pressed. .

In other words, when the central part of the push button is pressed, the lead chuck can be smoothly advanced through the slider, but when the front or rear part of the push button is pressed, the entire push button cannot be parallel to the lead chuck due to the unbalanced load. Since the pushbutton tends to sink without being maintained, the frictional resistance between the sliding contact surfaces of the pushbutton and slider becomes large, making it impossible for the slider to move smoothly and causing the core to not be fed out.

This invention was made to solve the above problems, and the purpose is to provide a side-knock type sharp pencil that can smoothly and reliably feed out the lead no matter which part of the push button is pressed.

[Means for solving problems]

The side-knot type sharpening pencil of this invention consists of an outer cylinder with a tip, a core pipe housed inside the outer cylinder so as to be able to slide in the axial direction, and a lead pipe interlocked with the tip of the core pipe via a lead guide. A side-knock type sharp pencil comprising a lead chuck, a chuck tightening ring that tightens the lead chuck, and an elastic body that urges the lead chuck in a backward direction, the side-knock type sharp pencil being housed in the outer cylinder and linked to the lead chuck, a link element having a pair of front and rear bending portions that buckle forward along the axial direction of the lead chuck due to external pressing force;
A push button is provided in circumferential contact with the link element and is sinkably provided on the peripheral wall on the distal end side of the outer cylinder.

[Effect]

In this device, when the push button is pressed, the link element buckles forward at two positions along the axial direction of the lead chuck, respectively, and the buckling advances the lead chuck to the center. is sent out.

〔Example〕

An embodiment of this invention will be described below based on the drawings.

First, in FIG. 1, 1 is an outer cylinder, and in this embodiment, a front outer cylinder 1A and a rear threaded joint 2 which also serves as a spring retainer are screwed to the rear end of the front outer cylinder 1 to be removably attached. It consists of a rear outer cylinder 1B which is connected together.

Reference numeral 3 denotes a tip tool which is removably screwed to the tip of the front outer cylinder 1A via an annular front threaded joint 4, 5 is a core guide provided through the axial center of the tip tool 3, and 6. It is a slider body provided at the rear end of the core guide 5,
The slider body 6 is made of, for example, synthetic resin, rubber, or the like that imparts an appropriate frictional holding force to the core.

Reference numeral 7 denotes a lead chuck that is housed in the front outer cylinder 1A so as to be movable along the axis, and the rear end side of the lead chuck 7 is connected to the front end of the rear outer cylinder 1B through the shaft hole of the rear threaded joint 2. Extending into the side.

Reference numeral 8 denotes a chuck tightening ring fitted onto the distal end side of the lead chuck 7, and 9 indicates a chuck tightening ring provided inside the front threaded joint 4. By abutting the rear end of the chuck tightening ring 8 against the front end, the lead chuck 7 can be retracted. An annular stopper 10 for regulating the movement is a press-fit pipe fitted into the lead chuck 7 as shown in FIG. 2a, and has an outward facing collar 10A at the front end. Reference numeral 11 denotes a slide pipe which is fitted onto the lead chuck 7 as shown in FIG. 2b and whose front end engages with the rear end of the press-fit pipe 10, and has an outward collar 11 at the rear end. Reference numeral 12 denotes a front elastic body interposed between the stopper 9 and the outward flange 10A of the press-fit pipe 10, and this front elastic body 12 urges the lead chuck 7 in the backward direction via the press-fit pipe 10. , provides a writable chuck tightening force.

Reference numeral 13 denotes a side lock mechanism built into the front outer cylinder 1A, and this side lock mechanism 13 is made up of a combination of a push button 14 and a link element 15.

The push buttons 14 are shown in FIGS. 3, 5 to 8.
As shown in the figure, it is fitted in a push button loading hole 16 that is partially provided along the axial direction in the peripheral wall of the front outer cylinder 1A so that it can be raised and lowered, and has a hat-shaped cross section and has two lower ends on both sides. It has an outer flange 14a, and this outer flange 14a functions to prevent the push button loading hole 16 from coming off when the push button 14 is at its upper limit position, as shown in the first figure.

The link element 15 is housed in the front outer cylinder 1A and is configured to buckle under the pressure of the push button 14 to advance the lead chuck 7.

That is, the link element 15 of this embodiment includes, as shown in FIG. The upper link portion 18 is fitted into and engaged with the upper link portion 18.
A dogleg-shaped front link part 20 that connects the front ends of the upper link part 18 and the lower link part 19 to each other via hinges 20a and 20b, and has an intermediate hinge part 20c.
, the upper link part 18 and the lower link part 1
9, the rear ends thereof are connected to each other via hinges 21a and 21b, and a six-bar parallel link structure is formed, which includes a rear link portion 21 that is parallel to the front link portion 20 and has an intermediate hinge portion 21c.

Each of the front link portion 20 and the rear link 21 is provided with slit holes 22 and 23 having large diameter holes 22a and 23a at their upper portions.

These slit holes 22 and 23 are press fit pipes 1
0 and each outward facing collar 10A of the slide pipe 11,
11A and each of the pipes 10, 1
The large diameter holes 22a, 2 are formed wider than the diameter of the holes 22a, 2.
3a is formed to have a larger diameter than the outer diameter of each of the outward facing flanges 10A, 11A. Thereby, the lead chuck 7 equipped with the press-fit pipe 10 and the slide pipe 11 can be easily inserted into the link element 15. Note that the large diameter holes 22a and 23a are not necessarily essential. A storage hole 18A is formed in the upper link portion 18 to accommodate the outward facing collar 11A of the slide pipe 11 when the push button 14 is pressed.

The lead chuck 7 is slidably inserted into the slit holes 22 and 23, so that
The front end of the intermediate hinge portion 20c of the front link portion 20 is engaged with the rear end of the outward collar 10A of the press-fit pipe 10, and the front end of the intermediate hinge portion 21c of the rear link portion 21 is engaged with the rear end of the outward collar 11A of the slide pipe 11. are combined.

24 is a core pipe inserted into the rear outer cylinder 1B so as to be slidable in the axial direction, and has a front end receiving part 25 at the front end.
The rear end side of the lead chuck 7 is loosely fitted into the shaft hole of the front end receiving part 25. An elastic body 26 is interposed between the front end receiving portion 25 and the rear threaded joint 2, and this elastic body 26 prevents the core pipe 24 from wobbling.

Next, the assembly order of the sharpening pencil of this invention will be explained.

The core pipe 24, rear elastic body 26, and rear threaded joint 2 are inserted into the rear outer cylinder 1B from the tip side in this order. Next, the lead chuck 7 to which the link element 15 pressure and the slide pipes 10, 11 are attached in advance is inserted into the front outer cylinder 1A from the tip side, and then the front elastic body 12, the stopper 9, the chuck tightening ring 8, and the tip The tool 3 is similarly inserted from the tip side, and the assembly work is completed.

Furthermore, the core feeding operation will be explained. There are two methods for the core feeding operation of this invention.

The first means of action is a normal knocking action.
That is, when the core pipe 24 is knocked in the axial direction at the rear end, the elastic body 26 at the tip of the core pipe 24
When the lead chuck 7 moves forward against the front elastic body 12 through the lead chuck 7, the lead is fed out. When the above-mentioned knob is released, the lead chuck 7 and the core pipe 24 are moved forward by the front elastic body 12 and the rear elastic body 26. It moves backwards, thereby entering the writing state.

The second operation means is a knock operation using the push button 14. That is, for example, if the lead becomes worn out as you write, press button 1.
When you press 4, as shown in Figures 5 and 6,
When the pressing force acts on the link element 15, the front link part 20 and the rear link part 21 of the link element 15 are moved to the respective intermediate hinge parts 2.
Buckling occurs at 0c and 21c. At this time, the intermediate hinge parts 20c and 21c push the outward flanges 10A and 11A of the press-fit pipe 10 and the slide pipe 11 in the axial direction by their respective buckling actions, so that the lead chuck 7 resists the front elastic body 12. The core is fed out by moving forward in the axial direction.

When the push button 14 is released, the lead chuck 7 is moved backward by the urging force of the front elastic body 12, and the press-fit pipe 10 and slide pipe 1
The outward flanges 10A and 11A press the intermediate hinge portions 20c and 21c in the backward direction, so that the link element 15 is restored to its pre-buckling position and the push button 14 is restored to its pre-pressed position.

In the embodiment shown in FIG. 9, the front end of the rear outer cylinder 1B is directly screwed and connected to the rear end of the front outer cylinder 1A, thereby eliminating the need for the rear threaded joint 2 in the previous embodiment, and A spring retainer ring 27 is fitted and engaged with the rear part of the link element 15 in the front outer cylinder 1A, and the spring retainer ring 27 and the rear core friction member 25 are connected to each other.
By interposing the rear elastic body 26 between the two, the structure is simplified and the assembly efficiency is improved.

In the embodiment of FIG.
A front lead chuck member 7A having an outer flange 7B on the rear end side, and an intermediate pipe member 7 whose front end side is externally fitted onto the rear end side of the front lead chuck member 7A.
C, and a rear pipe member 7F having an outer flange 7E on the front end side, the front end of which is internally fitted into the rear end of the intermediate pipe member 7C, and which sandwiches the intermediate pipe member 7C between the outer flange 7B. It has a split pipe configuration in which these parts are assembled one after another. This makes it possible to further simplify the structure.

[Effect of idea]

As described above, in this invention, the link element buckles forward in the axial direction at two locations along the axial direction of the lead chuck, at the front and the rear, due to the pressing force of the push button, thereby advancing the lead chuck. Even when pressed, the lead chuck can be smoothly advanced and the lead can be reliably fed out, thus greatly improving the performance of the side knock mechanism compared to the conventional one.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a side-knot type sharp pencil according to an embodiment of this invention, Fig. 2 is a perspective view of the press-fit pipe and slide pipe, Fig. 3 is a perspective view of the push button, and Fig. 4 is a perspective view of the link element. Figures 5 and 6 are action explanatory diagrams, Figure 7 is a sectional view taken along the - line in Figure 5, Figure 8 is a sectional view taken along the - line in Figure 6, and Figures 9 and 10 are different from each other. FIG. 7 is a sectional view showing another embodiment. 1 is an outer cylinder, 7 is a lead chuck, 13 is a side knob mechanism, 14 is a push button, 15 is a link element, and 24 is a core pipe.

Claims (1)

[Scope of utility model registration request] An outer cylinder having a tip, a core pipe housed inside the outer cylinder so as to be slidable in the axial direction, a lead chuck interlocked with the tip of the core pipe, and an elastic body that urges the lead chuck in a backward direction. and a side-knock mechanism incorporated in the outer cylinder, wherein the side-knock mechanism includes a push button that is sinkably provided on the peripheral wall on the distal end side of the outer cylinder, and a push button that is housed in the outer cylinder. and a link element having a pair of front and rear bent portions that are inscribed in the push button and linked to the lead chuck so as to buckle forward along the axial direction of the lead chuck due to the pressing force of the push button. formula sharpening pencil.