JPH0732129Y2 - Knock type mechanical pencil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention includes a lead-out mechanism, a cover, an elastic body that repels backward from the cover, and a locking sleeve for preventing backward movement of the front opening. The present invention relates to a knock type mechanical pencil attached to an outer cylinder.

[Prior art]

As a conventional knock type mechanical pencil of this type, for example, there is one described in Japanese Utility Model Laid-Open No. 63-182182.

This conventional example will be described with reference to FIG. 1. The lead-out mechanism 2 is inserted from the rear end side of the outer cylinder 1, and the junction 3 constituting the lead-out mechanism 2 and the front of the inner surface of the outer cylinder 1 are inserted. The elastic body 5 is inserted between the movement prevention portion and the locking sleeve 10 is inserted between the front end portion 7 of the tip end tool 6 connected to the junction 3 and the outer step portion 8 behind the tip end portion 7. The locking portion 11 provided on the tip side of the locking sleeve 10 is fitted between the front opening 7 of the tip tool 6 and the tip of the outer cylinder 1.

In such a conventional example, the lead-out mechanism 2 is pushed in from the rear of the outer cylinder 1 against the elastic body 5 inserted between the junction 3 and the forward movement preventing portion provided on the inner surface of the outer cylinder 1. And the front end portion 7 of the tip tool 6 connected to the junction 3.
The rear end of the locking sleeve 10 which is fitted between the outer step portion 8 and the rear step portion 8 is pushed by the outer step portion 8, and the locking portion 11 provided on the front end side of the locking sleeve 10 has an outer cylinder. When the pushing operation is stopped when protruding from the tip of the tip 1, the elastic body 5 causes the locking portion 11 to be fitted between the front end portion 7 of the tip tool 6 and the tip of the outer cylinder 1 to move the core feeding mechanism 2. It can be attached to the outer cylinder 1.

That is, according to such a conventional example, the lead-out mechanism 2 can be easily assembled to the outer cylinder 1 in one operation without rattling, there is no risk of disassembly, and the locking sleeve 10 can be mounted. The effect that there is no need to use a jig is obtained.

[Problems to be solved by the device]

However, in the above-mentioned conventional example, the outer diameter of the locking sleeve 10 is likely to vary, and when the outer diameter of the locking sleeve 10 is large, it is difficult to insert it into the distal end portion of the outer cylinder 1, and the outer diameter is small. If it passes, there is a problem that it will come off more easily than the outer cylinder 1.

Further, a core feeding mechanism 2 having an outer diameter smaller than the inner diameter of the outer cylinder 1
In order to incorporate the above, the shaft of the lead-out mechanism 2 inevitably swings, and since there is play between the locking sleeve 10 and the outer diameter A of the tip tool 6, the shaft is caught in the inner diameter of the tip of the outer cylinder 1. There is also a problem that the lead-out mechanism 2 cannot be smoothly incorporated into the outer cylinder 1.

Further, since the elastic body (return spring) 5 is received by the forward movement preventing portion, it is difficult to stably support the elastic body 5, not only the core feeding mechanism 2 cannot be firmly assembled into the outer cylinder 1, but also before the assembling. However, there is also a problem that the locking sleeve 10 and the elastic body 5 may be lost in later handling.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the knock type mechanical pencil of the present invention has a lead-out mechanism 2 inserted from the rear end side of the outer cylinder 1 as shown in FIG. 1 and connected to a junction 3 constituting the lead-out mechanism 2. A locking sleeve 10 is fitted between the front opening 7 of the provided tip tool 6 and the outer step portion 8 behind it,
The locking portion 11 provided on the front end side of the locking sleeve 10 is fitted between the front end portion 7 of the tip tool 6 and the tip of the outer cylinder 1, and the locking sleeve 10 and the front end portion of the outer cylinder 1 are fitted. Between the tip 19 of the cover 19
A is inserted, and the elastic body 5 is inserted between the rear portion of the cover 19 and the junction 3.

[Action]

When the lead-out mechanism 2 is pushed in from the rear of the outer cylinder 1 against the elastic body 5 inserted between the junction 3 and the cover 19 covering the lead-out mechanism 2, a tip tool connected to the junction 3 is provided. The rear end of the locking sleeve 10 inserted between the front opening portion 7 of 6 and the outer step portion 8 behind it is pushed by the outer step portion 8, and the locking sleeve 10 is provided on the tip side thereof. Part 11
However, when it protrudes from the tip of the outer cylinder 1, the pushing operation is stopped so that the locking portion 11 is fitted between the front opening portion 7 of the tip tool 6 and the tip of the outer tube 1, and the locking sleeve 10 The lead-out mechanism 2 can be assembled to the outer cylinder 1 with the front end 19a of the cover 19 fitted between the outer cylinder 1 and the outer cylinder 1.

〔Example〕

FIG. 1 is a half sectional view showing the construction of a first embodiment of a knock type mechanical pencil of the present invention, and FIG. 2 is a view showing a state immediately before assembling a lead-out mechanism in the first embodiment of FIG. FIG. 3 is a cross-sectional view of a portion, and FIG. 3 is a cross-sectional view of a main portion showing a state in the middle of assembling the lead-out mechanism and a completed state of the assembly in FIG.

In FIG. 1, 1 is an outer cylinder. Reference numeral 2 is a lead-out mechanism that is inserted from the rear end side of the outer cylinder 1.

This core feed-out mechanism 2 is a chuck which is connected to the core tank 13 when the rear part of the core tank 13 is knocked as is conventionally known.
14 to the chuck ring 15
The wick 18 in the wick tank 13 is opened or closed against the chuck spring 16 fitted between the junction 3 abutting the rear end of the wick and the front end of the wick tank 13 or by the spring force thereof.
The tip end portion 6 of the tip end tool 6 connected to the junction 3 by screwing or the like can be fed out by a predetermined length from the tip end.

A tip opening portion 7 of a tip tool 6 connected to a junction 3 which constitutes such a lead-out mechanism 2 and an outer step portion 8 behind it.
The locking sleeve 10 is fitted between and. The locking portion 11 provided on the distal end side of the locking sleeve 10 is fitted between the shoulder portion 12 of the front opening portion 7 of the distal end tool 6 and the distal end of the outer cylinder 1.

A metal cover 19 is attached to the front side of the lead-out mechanism 2 so that the tip portion 19a can be inserted between the locking sleeve 10 and the tip portion of the outer cylinder 1. An elastic body, for example, a spring 5 or a cushion sleeve is inserted between the junction 3 and the brim portion 19b provided at the rear end of the cover 19.

20 is a joint for connecting the chuck 14 and the lead tank 13, 21 is a rubber packing in the front opening 7, 22 is a cap, 23 is a clip, 24 is an eraser cradle, 25 is an eraser jacket, 26 is an eraser, and 27 is It is a knock cap.

In this embodiment having such a structure, in order to assemble the lead-out mechanism 2 into the outer cylinder 1, the cover 3 covers the junction 3 and the front side of the lead-out mechanism 2.
When pushed from the rear of the outer cylinder 1 against the spring 5 inserted between the collar portion 19b and the flange portion 19b, the front end portion 7 of the tip tool 6 connected to the junction 3 and the outer step portion 8 behind the front end portion 6 are formed. When the rear end of the locking sleeve 10 fitted between the two is pushed by the outer step portion 8 and the locking portion 11 provided on the tip side of the locking sleeve 10 protrudes from the tip of the outer cylinder 1, it is pushed. When the operation is stopped, the locking portion 11 becomes the shoulder portion 12 of the front end portion 7 of the tip tool 6 and the outer cylinder 1.
It is possible to assemble the lead-out mechanism 2 to the outer cylinder 1 in a state in which the tip 19a of the cover 19 is fitted between the locking sleeve 10 and the front end of the outer cylinder 1 while being fitted between the outer cylinder 1 and the front end of the outer cylinder 1. it can. FIG. 2 shows a state immediately before the lead-out mechanism 2 is assembled.

Further, the lead-out mechanism 2 is pushed fully into the outer cylinder 1 (see the lower half of FIG. 3), and the engaging portion 11 of the engaging sleeve 10 is bent inward so that the spring 19 causes the cover 19 to move. The lead delivery mechanism 2 covering the front side can be taken out.

The upper half of FIG. 3 shows a state in which the lead-out mechanism 2 is completely assembled in the outer cylinder 1.

According to the present embodiment, the tip 3 connected to the junction 3 is simply released by pushing the junction 3 which constitutes the core feeding mechanism 2 whose front side is covered with the cover 19 against the outer cylinder 1 against the spring 5. The locking portion 11 of the locking sleeve 10 fitted between the front opening portion 7 of 6 and the outer step portion 8 at the rear of the front sleeve portion 7 of The core feeding mechanism 2 is fitted to the outer cylinder 1 with the tip 19a of the cover 19 fitted between the locking sleeve 10 and the tip 1a of the outer cylinder 1. Because you can
The lead-out mechanism 2 can be assembled by merely releasing the pushing-out of the lead-out mechanism 2, and the tip portion 19a of the cover 19 is fitted between the locking sleeve 10 and the tip portion of the outer cylinder 1. At the same time, it is possible not only to easily eliminate the play by fitting the locking portion 11 of the locking sleeve 10 between the shoulder portion 12 of the front opening 7 and the tip of the outer cylinder 1, but also to the outer cylinder 1. The core feeding mechanism will not be removed.

Further, when mounting the locking sleeve 10, the flexibility is inserted from the front opening 7 side before the core feeding mechanism 2 is set in the outer cylinder 1, and the cover 19 is provided on the front side of the core feeding mechanism 2. It is needless to say that it is possible to prevent the core from being broken or coming off due to the looseness of the front opening portion 7 as well as to prevent the need to use a jig simply by covering it.

In particular, in this embodiment, since the tip end portion 19a of the cover 19 is covered on the locking sleeve 10, the outer diameter of the locking sleeve 10 can be regulated and the center of the shaft body can be projected, so that the core feeding mechanism to the outer cylinder 1 can be achieved. 2 can be easily and stably incorporated.
Further, since the cover 19 is provided, even if the outer diameter of the locking sleeve 10 varies, the locking sleeve 10 can be easily inserted into the distal end portion of the outer cylinder 1 together with the distal end portion 19a of the cover 19, and the outer cylinder There is no danger of deviating from 1.

Further, by providing the cover 19, the outer step portion 8 of the tip tool 6 is provided.
Since the weakness of the step due to is eliminated and the shaft body of the lead-out mechanism 2 is prevented from swinging with the inner diameter of the outer cylinder 1, the shaft body is not caught by the inner diameter of the outer cylinder 1 and smoothly The lead-out mechanism 2 can be incorporated in the core.

Furthermore, since the spring 5 is received by the cover 19, not only the spring 5 can be stably and easily supported and the lead-out mechanism 2 can be firmly incorporated into the outer cylinder 1, but also the cover 19 is provided, so that the incorporation is possible. By the handling before and after, there is an effect that the locking sleeve 10 and the spring 5 are not lost.

1 to 3 show the inside of the tip of the outer cylinder 1 and the tip of the cover 19.
Although a slight clearance y is provided between the front end 19a of the cover 19 and the inner surface of the front end of the outer cylinder 1, the clearance y is zero or the width x of the locking portion 11 (see FIG. 7). This is a second embodiment in which y is smaller than that shown in FIG. The tip inner surface of the outer cylinder 1 and the tip portion of the cover 19 contact each other, that is, the gap y between the tip inner surface of the outer tube 1 and the tip portion 19a of the cover 19 is zero or smaller than the width x of the locking portion 11, that is, y <. By setting x, the lead-out mechanism 2 can be smoothly set in the outer cylinder 1. It can be said that the embodiment of FIG. 4 is easier to incorporate the lead-out mechanism 2 into the outer cylinder 1 if there is no variation in the wall thickness of the outer cylinder.

The above-mentioned first and second embodiments have shown an example using the metal cover 19, but FIG. 5 shows a third embodiment using a plastic cover as a cover before mounting the lead-out mechanism. Fig. 6 (a), which shows the state and the state during assembly
(B) is a figure which shows the state before assembling a lead-out mechanism in a 3rd Example, and an assembly completion state, respectively.

The third embodiment has the same structure and operational effects as the first and second embodiments except that the cover 19 is made of plastic.

Further, the first and second embodiments are examples in which the locking sleeve 10 is made of metal, and the thickness thereof can be made thin, and the slit 28 as shown in FIG. 7 (a) provides flexibility. Is preferable because it can improve

The locking sleeve 10 may be formed of an elastic body such as rubber, in which case the slit can be eliminated as shown in FIG. 7 (b).

FIG. 7 (c) shows an example in which the locking sleeve 10 is formed by molding, and the slit 29 is provided at one or more places.

As described above, the locking sleeve 10 may be made of metal, plastic, rubber or the like, and its material is not limited. Further, the locking sleeve 10 may or may not be provided with a slit. If not provided, it is desirable to select a relatively elastic material.

FIG. 8 is a diagram showing a main part of the fourth embodiment. The fourth embodiment is an example in which the locking sleeve 10, the cover 19 and the elastic body 5 are integrally formed by molding, and the number of parts is the same except that the same effect as the first to third embodiments is obtained. There is an effect that can be reduced.

FIG. 9 shows an essential part of the fifth embodiment, which is an example in which the cover 19 and the locking sleeve 10 are integrally formed. FIG. 10 shows a front view of the cover 19 of the present invention, and 30 is a notch provided on the side of the locking portion 11.

The fifth embodiment is an example in which the locking sleeve 10 and the cover 19 are integrally formed, and one component is added as compared with the fourth embodiment except that the same effects as the first to fourth embodiments are obtained. The number of parts can be reduced.

In the present invention, in the first to fifth embodiments, as shown in FIG. 6 (a), the whole core feeding mechanism 2 is covered by the cover 19 and the whole mechanism is placed in the outer cylinder 1 as shown in FIG. 6 (b). It is built in from the back.

[Effect of device]

As described above, according to the present invention, the lead-out mechanism 2 can be easily assembled to the outer cylinder 1 in one operation without rattling, there is no risk of the assembly coming off, and the locking sleeve 10 can be easily mounted. Not only is it unnecessary to use a tool, but also the locking sleeve 10 has the effect of preventing the core from being broken or coming off due to the loosening of the front opening 7, and the locking sleeve 10 has a tip portion of the cover 19.
Since it is covered with 19a, the outer diameter of the locking sleeve 10 can be regulated, and the center of the shaft can be projected, so that the core feeding mechanism 2 can be easily and stably incorporated in the outer cylinder 1. Further, since the cover 19 is provided, even if the outer diameter of the locking sleeve 10 varies, the locking sleeve 10 can be easily inserted into the distal end of the outer cylinder 1 together with the tip portion 19a of the cover 19, and the outer cylinder There is no danger of deviating from 1.

Further, by providing the cover 19, the locking sleeve 10 and the locking portion 11 are regulated so as not to cause an outer diameter variation, and the dimension is stabilized, and moreover, the outer diameter A of the locking sleeve 10 and the tip tool 6 is adjusted. And the shaft body of the lead-out mechanism 2 does not swing between itself and the inner diameter of the outer cylinder 1, so that the shaft body is not caught by the inner diameter of the tip of the outer cylinder 1.
The lead-out mechanism 2 can be smoothly incorporated into the outer cylinder 1.

Further, since the elastic body 5 is received by the brim portion 19b of the cover 19, the elastic body 5 can be stably and easily supported, and the lead-out mechanism 2 can not only be robustly incorporated into the outer cylinder 1, but also the cover 19 Since the above is provided, there is an effect that the locking sleeve 10 and the elastic body 5 are not lost during handling before and after assembling.

[Brief description of drawings]

FIG. 1 is a half sectional view showing the construction of a first embodiment of a knock type mechanical pencil of the present invention, and FIG. 2 is a view showing a state immediately before assembling a lead-out mechanism in the first embodiment of FIG. 3 is a cross-sectional view of the main part showing the state in the middle of assembling the lead-out mechanism and the completed state in FIG. 2, and FIG. 4 is the tip of the cover up to near the tip of the outer cylinder. Sectional drawing which shows the structure of the principal part of 2nd Example which has been inserted, FIG. 5 is sectional drawing which shows the structure of the principal part of 3rd Example which used the thing made from plastic as a cover, FIG. 6 (a). ),
FIG. 7B is a sectional view of an essential part showing a state before assembling the lead-out mechanism and a completed state in the third embodiment, and FIGS. FIG. 8 is an explanatory view of a stop sleeve, FIG. 8 is a cross-sectional view showing the structure of the main part of the fourth embodiment, and FIG. 9 is a fifth embodiment when a metal cover is used and is integrated with a locking sleeve. FIG. 10 is a cross-sectional view showing the configuration of the main part of FIG. 10, and FIG. 10 is a front view of the cover in the present invention. 1 ... Outer cylinder, 2 ... Core feeding mechanism, 3 ... Junction, 5 ... Elastic body (spring), 6 ... Tip tool, 7
...... Front end part, 8 ... Outer stage part, 10 ... Locking sleeve, 11 ...
… Locking part, 13… Wick tank, 19… Cover, 19a… Tip part, 19b… Collar part.

Claims (5)

[Scope of utility model registration request] 1. A locking sleeve is inserted between a rear end side of an outer cylinder and a tip end portion of a tip tool connected to a junction forming the core feeding mechanism and an outer step portion thereof. And the locking portion provided on the distal end side of the locking sleeve is fitted between the front end portion of the tip tool and the distal end of the outer cylinder, and the locking sleeve and the distal end portion of the outer cylinder are fitted. A knock-type mechanical pencil in which a tip of a cover is fitted between and a resilient body is inserted between the rear of the cover and the junction. 2. A knock type mechanical pencil according to claim 1, wherein a rear end portion of the cover is provided with a brim portion for receiving an elastic body. 3. The knock type mechanical pencil according to claim 1, wherein the locking sleeve, the cover and the elastic body are integrally provided. 4. The knock type mechanical pencil according to claim 1, wherein the locking sleeve and the cover are integrated and the elastic body is provided separately. 5. The knock type mechanical pencil according to claim 1, wherein the gap y between the inner surface of the tip of the outer cylinder and the tip of the cover is zero or smaller than the width x of the engaging portion.