EP0213275A1 - Automatic mechanical pencil - Google Patents
Automatic mechanical pencil Download PDFInfo
- Publication number
- EP0213275A1 EP0213275A1 EP86106534A EP86106534A EP0213275A1 EP 0213275 A1 EP0213275 A1 EP 0213275A1 EP 86106534 A EP86106534 A EP 86106534A EP 86106534 A EP86106534 A EP 86106534A EP 0213275 A1 EP0213275 A1 EP 0213275A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chuck
- lead
- slider
- mouth piece
- mechanical pencil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K21/00—Propelling pencils
- B43K21/02—Writing-core feeding mechanisms
- B43K21/22—Writing-cores gripping means, e.g. chucks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K21/00—Propelling pencils
- B43K21/02—Writing-core feeding mechanisms
- B43K21/027—Writing-core feeding mechanisms with sliding tubelike writing-core guide
Definitions
- This invention relates to a machanical pencil, in particular to an automatic mechanical pencil feeding out the lead, which is formed in such a manner that when the lead is consumed by the writing, the lead is automatically fed out by releasing the writing tip from the paper surface.
- One of the objects of this invention is to obtain an automatic mechanical pencil feeding out the lead automatically, without providing the usual lead supply mechanism for a new lead by the knocking operation in case the lead has completely been consumed, and the whole body is simply formed.
- Another object of this invention is to obtain an automatic mechanical pencil, wherein an automatic feed out mechanism of the lead is provided within a mouth piece to be connected to the main body, and when the mouth piece is detached from the main body, the lead can be directly supplied by hand to the automatic feed out mechanism of the lead.
- an automatic mechanical pencil having a chuck mechanism which allows only an advance motion of the lead and a slider mechanism which takes out the lead forward, are provided within the mouth piece to be connected to the main body.
- a mouth piece (2) connected to a main body (1) has a connecting pipe (3) on its rear portion, and a male screw provided on the outer periphery of the connecting pipe is screw clamped with a female screw provided on the main body, thus connecting the mouth piece to the main body.
- the connecting may be effected with a fitting-in and other suitable means instead of the screw clamping.
- a slider (4) is inserted shiftably in an axial direction.
- the slider (4) is fitted with an elastic piece (6) so as to elastically hold a lead (5) by the frictional action at the rear portion, while at the front end a lead guide (7) made of the plastic material having a small frictional action is provided.
- the plastic material polyacetal, polyamide, fluororesin and other thermoplastic materials having a low coefficient of the friction are used.
- metallic pipe such as a stainless pipe can be used, but when it is made of the plastic material, i.e., polyacetal and polyamide whose coefficient of the friction is about 0.15 - 0.2, as shown in the drawing, the friction may be made extremely small.
- the slider is integrally formed with the plastic material including the guide pipe.
- the pipe may be separately made and then be combined.
- the pipe (7) is preferably provided with a taper (8) at its front end and is slidably inserted in a bore (9) provided in the mouth piece.
- a flange (10) is provided, and the slider can advance until the flange (10) abuts against a shoulder (11) of the mouth piece.
- the mouth piece (2) may preferably be made of the plastic material, such as polyacetal and polyamide, having the similar effect to that of the guide pipe.
- the chuck elements have such shapes as to devide the cylinder into nearly halves, having a lead gripping portion (18) with a suitable rough face internally; and the front and rear parts of the gripping portion are made so that they form a space having slightly larger diameter, adjacent to a slant, than outside diameter of the lead to combine two chuck elements facing each other.
- a flange (19) is so provided that it abuts against a rear end (20) of the chuck ring (17) to prevent the chuck and balls from falling out forwardly; however, the flange (19) is not always necessary.
- the chuck ring (17) is provided with a shoulder (21) rearwardly to form into smaller diameter (22) and is pressed in a bore (23) of the connecting pipe (3) under either state of an idle fitting or a light press fitting. Under this state, the tip of the chuck ring abuts on a slant (24) adjacent to the bore (23); and in the smaller diameter portion (22) at the rear portion, an inner projection (25) of the connecting pipe (3) comes in, and the rear end (20) of the chuck ring projects slightly backward. Since the chuck is formed as mentioned above, when it is shifted backwardly, the balls roll into the narrow portion of the tapered face and the chuck elements are tightened to grip the lead.
- a spring (27) is provided so as to project the front end of the guide pipe (7) of the slider (4) from the tip of the mouth piece (2) and to urge the chuck (13) backwardly.
- the slider (4) is inserted from the rear of the mouth piece; the spring (27) is inserted; the chuck elements (12), (12) are combined; balls (15) are put in and under such a state, the chuck ring (17) is fitted in, and these portions may be forcibly pushed in from the rear portion of the connecting pipe (3) over the inner projection (25). Thereafter, by the fact that the flange (10) abuts on the shoulder (11), and the balls are pushed by the tapered portion (16) of the chuck ring (17), both of the slider and the chuck would never drop out from the mouth piece.
- the lead (5) is pushed from the rear of the chuck (13), and by the tip of the lead, the chuck (13) is advanced.
- the gripping force by means of the balls (15) and the chuck ring (17) will vanish and the lead will pass through the gripping portion of the chuck, the front end of the lead advances until it becomes flush with the tip of the guide pipe (7) of the slider (4).
- the chuck shifts backward, thus an action of the gripping force prevents the lead from retracting.
- plastic foam (28) of a shape as approximately conforming to the inner wall of the main body is put on, and by the plastic foam, the shock in case of dropping of the pencil is softened, thus the breakage of the lead may be prevented.
- the main body is formed transparent, the length of the residue lead may be seen through.
- the writing may be effected and the writing pressure will be received by the shoulder (29) of the main body via the chuck, balls, and the chuck ring. Further, when the inner projection (25) of the connecting pipe is made strong, the writing pressure may be received by the projection.
- the slider (4) will retract against the spring (27) with the wear of the lead.
- the chuck will also advance to release the gripping action by the balls and the chuck ring, so that the advance of the lead is not checked. Thereafter, the chuck returns backward by the spring (27), and the gripping action by the balls and the chuck ring is restored to check the retraction of the lead.
- the mouth piece When the lead is consumed, the mouth piece may be taken off from the main body and the new lead may be supplied from the rear portion of the chuck. Even through the removal of the mouth piece, the chuck will never be separated from the mouth piece.
- a slant (30) is provided on the rear end of the chuck (13), and a push button (32) having a slant 31) engaging with the slant (30) is provided on the side of the main body (1) so that the button can freely go in and out.
- the button (32) is normally put under the state that the slant would not be operated by the elastic legs (33). As shown in Fig.
- the chuck (13) when the lead is put under the projected state, by pushing the push button (32), the chuck (13) is advanced via the slant (30), (31) and the gripping action of the chuck may be made to vanish, so that when the tip of the lead is pushed on a paper face, the tip of the lead will become flush with the guide pipe of the slider, thus the lead can be restored.
- the mouth piece may be provided with a cap, and the supply mechanism for the lead may be provided within the main body.
- the formation thereof is simple, comprising a small number of parts, so that it may be made economically and used conveniently with few troubles.
Landscapes
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Abstract
Description
- This invention relates to a machanical pencil, in particular to an automatic mechanical pencil feeding out the lead, which is formed in such a manner that when the lead is consumed by the writing, the lead is automatically fed out by releasing the writing tip from the paper surface.
- Various types of mechanical pencils feeding out the lead automatically are well known, and most of them are so formed that when the writing stops, the lead will be fed out. However many of them are complicated in construction and have a lot of parts and cannot be economically obtained.
- Generally, in the usual automatic mechanical pencil feeding out the lead automatically, there is provided with a device which will automatically supply a new lead by a knocking operation, when one lead is completely consumed by the writing. When such a device is provided within a main body, the construction will become complicated inevitably, and the production costs will become higher.
- One of the objects of this invention is to obtain an automatic mechanical pencil feeding out the lead automatically, without providing the usual lead supply mechanism for a new lead by the knocking operation in case the lead has completely been consumed, and the whole body is simply formed.
- Another object of this invention is to obtain an automatic mechanical pencil, wherein an automatic feed out mechanism of the lead is provided within a mouth piece to be connected to the main body, and when the mouth piece is detached from the main body, the lead can be directly supplied by hand to the automatic feed out mechanism of the lead.
- According to this invention, an automatic mechanical pencil having a chuck mechanism which allows only an advance motion of the lead and a slider mechanism which takes out the lead forward, are provided within the mouth piece to be connected to the main body.
- Other objects and features of this invention will become apparent from the following detailed description with reference to the accompanying drawings.
-
- Fig. 1 is a vertical sectional view of an automatic mechanical pencil according to this invention, schematically showing a portion of the main body.
- Fig. 2 is an enlarged sectional view of the mouth piece portion of the mechanical pencil according to this invention, under the state that the lead is not supplied.
- Fig. 3 is a front view of an automatic mechanical pencil according to this invention in case a push button for advancing a chuck is provided, showing a half sectional portion of the pencil along its axial direction.
- Fig. 4 is a perspective view of the push button shown in Fig. 3.
- In the drawing, a mouth piece (2) connected to a main body (1) has a connecting pipe (3) on its rear portion, and a male screw provided on the outer periphery of the connecting pipe is screw clamped with a female screw provided on the main body, thus connecting the mouth piece to the main body. The connecting may be effected with a fitting-in and other suitable means instead of the screw clamping. In the tip portion of the mouth piece, a slider (4) is inserted shiftably in an axial direction. The slider (4) is fitted with an elastic piece (6) so as to elastically hold a lead (5) by the frictional action at the rear portion, while at the front end a lead guide (7) made of the plastic material having a small frictional action is provided. As the plastic material, polyacetal, polyamide, fluororesin and other thermoplastic materials having a low coefficient of the friction are used. For the pipe, metallic pipe such as a stainless pipe can be used, but when it is made of the plastic material, i.e., polyacetal and polyamide whose coefficient of the friction is about 0.15 - 0.2, as shown in the drawing, the friction may be made extremely small. Further, in the drawing, the slider is integrally formed with the plastic material including the guide pipe. However, the pipe may be separately made and then be combined. The pipe (7) is preferably provided with a taper (8) at its front end and is slidably inserted in a bore (9) provided in the mouth piece. On the intermediate portion of the slider (4), a flange (10) is provided, and the slider can advance until the flange (10) abuts against a shoulder (11) of the mouth piece. And the mouth piece (2) may preferably be made of the plastic material, such as polyacetal and polyamide, having the similar effect to that of the guide pipe.
- Facing the rear portion of the slider (4), there are provided with a chuck (13) and a chuck ring(17), among which the former (13) is formed so that it can grip the lead by combining complementarily plural chuck elements (12), (12) (two of them are shown in the drawing) and the latter (17) is put on an outer periphery of the chuck elements (12) and is formed to have a tapered face (16) internally so as to receive balls (15) seated on a concave (14) of the outer face of the chuck elements (12). The chuck elements have such shapes as to devide the cylinder into nearly halves, having a lead gripping portion (18) with a suitable rough face internally; and the front and rear parts of the gripping portion are made so that they form a space having slightly larger diameter, adjacent to a slant, than outside diameter of the lead to combine two chuck elements facing each other. On the rear portion of the chuck, a flange (19) is so provided that it abuts against a rear end (20) of the chuck ring (17) to prevent the chuck and balls from falling out forwardly; however, the flange (19) is not always necessary. The chuck ring (17) is provided with a shoulder (21) rearwardly to form into smaller diameter (22) and is pressed in a bore (23) of the connecting pipe (3) under either state of an idle fitting or a light press fitting. Under this state, the tip of the chuck ring abuts on a slant (24) adjacent to the bore (23); and in the smaller diameter portion (22) at the rear portion, an inner projection (25) of the connecting pipe (3) comes in, and the rear end (20) of the chuck ring projects slightly backward. Since the chuck is formed as mentioned above, when it is shifted backwardly, the balls roll into the narrow portion of the tapered face and the chuck elements are tightened to grip the lead. On the other hand, when the chuck shifts forwardly, the balls roll into the wider portion of the tapered face, so that the gripping force by means of balls and the chuck ring will vanish, and the chuck elements will part from each other to allow the advance movement of the lead.
- Between the flange (10) of the slider (4) and a tip portion (26) of the chuck (13), a spring (27) is provided so as to project the front end of the guide pipe (7) of the slider (4) from the tip of the mouth piece (2) and to urge the chuck (13) backwardly.
- To assmeble each portion, the slider (4) is inserted from the rear of the mouth piece; the spring (27) is inserted; the chuck elements (12), (12) are combined; balls (15) are put in and under such a state, the chuck ring (17) is fitted in, and these portions may be forcibly pushed in from the rear portion of the connecting pipe (3) over the inner projection (25). Thereafter, by the fact that the flange (10) abuts on the shoulder (11), and the balls are pushed by the tapered portion (16) of the chuck ring (17), both of the slider and the chuck would never drop out from the mouth piece.
- Into the mouth piece (2) assembled as mentioned above, the lead (5) is pushed from the rear of the chuck (13), and by the tip of the lead, the chuck (13) is advanced. When the chuck is advanced, the gripping force by means of the balls (15) and the chuck ring (17) will vanish and the lead will pass through the gripping portion of the chuck, the front end of the lead advances until it becomes flush with the tip of the guide pipe (7) of the slider (4). When the lead is pushed backward under this state, the chuck shifts backward, thus an action of the gripping force prevents the lead from retracting. Further, on the rear end of the lead, preferably, plastic foam (28) of a shape as approximately conforming to the inner wall of the main body is put on, and by the plastic foam, the shock in case of dropping of the pencil is softened, thus the breakage of the lead may be prevented. When the main body is formed transparent, the length of the residue lead may be seen through.
- In case that the mouth piece (2) is connected to the main body (1), the rear end (20) of the chuck ring (17) abuts on a shoulder (29) of the main body (1) facing to the rear end of the connecting pipe.
- Since the lead is gripped by the chuck not to retract backward, the writing may be effected and the writing pressure will be received by the shoulder (29) of the main body via the chuck, balls, and the chuck ring. Further, when the inner projection (25) of the connecting pipe is made strong, the writing pressure may be received by the projection. By the writing, the slider (4) will retract against the spring (27) with the wear of the lead. However, when the writing is stopped and the writing pressure is removed, the slider is advanced by the spring, and the lead kept by the elastic piece (6) will be fed out together. When the lead advances, the chuck will also advance to release the gripping action by the balls and the chuck ring, so that the advance of the lead is not checked. Thereafter, the chuck returns backward by the spring (27), and the gripping action by the balls and the chuck ring is restored to check the retraction of the lead.
- When the lead is consumed, the mouth piece may be taken off from the main body and the new lead may be supplied from the rear portion of the chuck. Even through the removal of the mouth piece, the chuck will never be separated from the mouth piece.
- When the slider (4) itself is abutted on the edge of a ruler, the slider will retract. As the result thereof, the lead will project forward from the tip of the guide pipe (7), but in such a case, an example for effecting the retraction of the lead is shown in Fig. 3.
- In Fig. 3, the same reference number as in Fig. 1 is used in the similar elements. In this figure, a slant (30) is provided on the rear end of the chuck (13), and a push button (32) having a slant 31) engaging with the slant (30) is provided on the side of the main body (1) so that the button can freely go in and out. The button (32) is normally put under the state that the slant would not be operated by the elastic legs (33). As shown in Fig. 3, when the lead is put under the projected state, by pushing the push button (32), the chuck (13) is advanced via the slant (30), (31) and the gripping action of the chuck may be made to vanish, so that when the tip of the lead is pushed on a paper face, the tip of the lead will become flush with the guide pipe of the slider, thus the lead can be restored. Further, the mouth piece may be provided with a cap, and the supply mechanism for the lead may be provided within the main body.
- As mentioned above, in this invention, the formation thereof is simple, comprising a small number of parts, so that it may be made economically and used conveniently with few troubles.
Claims (6)
a mouth piece connected to the tip of a main body; and
a chuck and slider provided within said mouth piece, wherein said chuck prevents backward movement of the lead due to the writing pressure, but allows forward movement thereof, said slider elastically grips the lead and moves backward as the lead wears, and when the writing pressure is removed, said slider is urged to advance carrying the lead therewith.
a slider shiftably inserted in the front portion of the mouth piece, having an elastic piece which holds the lead by the frictional action;
a chuck formed so that plural chuck elements are complementarily combined to grip the lead and are shiftably provided;
balls and a chuck ring positioned on the outer periphery of said chuck so as to tighten said chuck, when said chusk is shifted backward; and
a spring provided between the slider and said chuck to project the tip of said slider from the front portion of the mouth piece as well as to urge shifting said chuck backwardly.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP174992/85 | 1985-08-10 | ||
JP60174992A JPS6235896A (en) | 1985-08-10 | 1985-08-10 | Automatic delivery type propelling pencil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0213275A1 true EP0213275A1 (en) | 1987-03-11 |
EP0213275B1 EP0213275B1 (en) | 1990-03-07 |
Family
ID=15988323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86106534A Expired - Lifetime EP0213275B1 (en) | 1985-08-10 | 1986-05-14 | Automatic mechanical pencil |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0213275B1 (en) |
JP (1) | JPS6235896A (en) |
KR (1) | KR890001645B1 (en) |
DE (1) | DE3669281D1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0650235Y2 (en) * | 1988-03-04 | 1994-12-21 | 三菱鉛筆株式会社 | Sharp pencil |
JPH0621754Y2 (en) * | 1988-03-04 | 1994-06-08 | 三菱鉛筆株式会社 | Check Set for Sharp Pencil |
JPH0621755Y2 (en) * | 1988-12-12 | 1994-06-08 | 三菱鉛筆株式会社 | Check Set for Sharp Pencil |
JPH0286785U (en) * | 1988-12-26 | 1990-07-10 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3424535A (en) * | 1966-10-18 | 1969-01-28 | Konstantin F Schischkow | Self-feeding pencil |
US3544228A (en) * | 1968-10-16 | 1970-12-01 | Ludwig Wittrock | Thin-lead mechanical pencil |
DE2153400A1 (en) * | 1971-10-27 | 1973-05-03 | Kemal Dipl Ing Butka | FILLING PENS FOR THIN LEASH |
US3864046A (en) * | 1973-02-16 | 1975-02-04 | Kemal Butka | Mechanical pencil, especially for thin leads |
DE2447431A1 (en) * | 1974-10-04 | 1976-04-08 | Faber Castell A W | Propelling pencil with indexing lead - has internal flange supporting clamp for a spring and ring for lead jaws |
DE2821625A1 (en) * | 1977-05-22 | 1978-11-30 | Ancos Co Ltd | MECHANICAL PEN |
US4411543A (en) * | 1979-10-29 | 1983-10-25 | Pentel Kabushiki Kaisha | Self-feeding mechanical pencil |
DE3229498A1 (en) * | 1982-08-07 | 1984-02-09 | Fa. J.S. Staedtler, 8500 Nürnberg | WRITING INSERT WITH MINES FOR AUTOMATIC TYPEWRITING OR SIGNING MACHINES |
-
1985
- 1985-08-10 JP JP60174992A patent/JPS6235896A/en active Granted
-
1986
- 1986-04-15 KR KR1019860002856A patent/KR890001645B1/en not_active IP Right Cessation
- 1986-05-14 EP EP86106534A patent/EP0213275B1/en not_active Expired - Lifetime
- 1986-05-14 DE DE8686106534T patent/DE3669281D1/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3424535A (en) * | 1966-10-18 | 1969-01-28 | Konstantin F Schischkow | Self-feeding pencil |
US3544228A (en) * | 1968-10-16 | 1970-12-01 | Ludwig Wittrock | Thin-lead mechanical pencil |
DE2153400A1 (en) * | 1971-10-27 | 1973-05-03 | Kemal Dipl Ing Butka | FILLING PENS FOR THIN LEASH |
US3864046A (en) * | 1973-02-16 | 1975-02-04 | Kemal Butka | Mechanical pencil, especially for thin leads |
DE2447431A1 (en) * | 1974-10-04 | 1976-04-08 | Faber Castell A W | Propelling pencil with indexing lead - has internal flange supporting clamp for a spring and ring for lead jaws |
DE2821625A1 (en) * | 1977-05-22 | 1978-11-30 | Ancos Co Ltd | MECHANICAL PEN |
US4411543A (en) * | 1979-10-29 | 1983-10-25 | Pentel Kabushiki Kaisha | Self-feeding mechanical pencil |
DE3229498A1 (en) * | 1982-08-07 | 1984-02-09 | Fa. J.S. Staedtler, 8500 Nürnberg | WRITING INSERT WITH MINES FOR AUTOMATIC TYPEWRITING OR SIGNING MACHINES |
Also Published As
Publication number | Publication date |
---|---|
JPS6235896A (en) | 1987-02-16 |
KR870001945A (en) | 1987-03-28 |
DE3669281D1 (en) | 1990-04-12 |
EP0213275B1 (en) | 1990-03-07 |
KR890001645B1 (en) | 1989-05-12 |
JPH0460440B2 (en) | 1992-09-28 |
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