EP0146128A2 - Porte-mine automatique - Google Patents
Porte-mine automatique Download PDFInfo
- Publication number
- EP0146128A2 EP0146128A2 EP84115435A EP84115435A EP0146128A2 EP 0146128 A2 EP0146128 A2 EP 0146128A2 EP 84115435 A EP84115435 A EP 84115435A EP 84115435 A EP84115435 A EP 84115435A EP 0146128 A2 EP0146128 A2 EP 0146128A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- chuck
- lead
- elements
- mechanical pencil
- operating ring
- 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.)
- Withdrawn
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Images
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
- B43K21/033—Writing-core feeding mechanisms with sliding tubelike writing-core guide with automatic feed by pressure during use of pencil
Definitions
- This invention relates to a mechanical pencil, in particular to an automatic lead feed out mechanical pencil 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 paper surface.
- the mechanism of shift control means of lead for presenting retract movement should be precisely made, and so it is difficult to make mechanical pencils having such construction with plastic material.
- the tip of chuck itself is usually made to be always opened.
- a cylindrical chuck is provided with a slit at its tip portion to expand the tip outwardly.
- the object of this invention is that in an automatic mechanical pencil, the chuck forming the shift control means is not formed by bending itself so that its tip will always open outwardly, but it is formed so that its tip will open outwardly when the lead is fed out.
- an automatic mechanical pencil wherein the shift control means controlling the shift of lead so as to allow only advance movement of the lead includes a chuck formed by the combination of plural chuck elements, which are swingably connected at their intermediate portion so that they grip the lead cooperating at their front ends and when their rear ends are pushed, the front ends will open in the direction of mutual release.
- the automatic lead feed out mechanical pencil of the present invention comprises a main body (1), and a cap nozzle (2) screwed in the main body. Within the cap nozzle are disposed a slider means which elastically holds a writing lead by friction and is shiftable in axial direction and urged so as to project an end of the lead from the tip portion of the cap nozzle, and a shift control means which allows advance movement of the lead and prevents in its retraction.
- the slider means is constructed as follows.
- a lead guide sleeve (3) whose front end is protruded from the cap nozzle and the rear end is fixed to a lead engaging collet.
- This collet is fixed on its rear portion with an elastic ring (6) made of elastic material such as rubber, plastic and the like to hold a writing lead (5) by frictional action, and is inserted shiftably in axial direction into a holding barrel (7) fixed to the cap nozzle.
- a spring (10) is provided between a flange (8) provided on the front portion of the collet and a shoulder (9) inward of the holding barrel.
- the collet When the front end of the sleeve is pushed rearward, the collet will retract along axial direction until the flange (8) hits on front end face (11) of the holding barrel (7). When the pressure pushing the front end of the sleeve is released, the collet will return to its advanced position by the spring. Accompanied therewith, the lead held by the elastic ring (6) will advance.
- the shift control means shown in Fig. 1 is constructed as follows.
- a housing barrel (14) Within an inner barrel (12) extending rearward of the cap nozzle, a housing barrel (14) is inserted, of which both ends are fixed with retaining rings (13), (13), and the housing barrel is provided so that it can advance until its front end (15) hits against a shoulder (16) on the cap nozzle and it can retract until its rear end (17) hits against a projection (18) of the inner barrel.
- a cylindrical operating ring (20) is inserted, having a tapered face (19), whose inner face is slanting to be forwardly wide and rearwardly narrow.
- the operating ring includes two rings, i.e., a front operating ring and a rear operating ring, but one or more than three operating rings may be provided.
- a cylindrical chuck (21) is inserted shiftably in axial direction and between outer face of the chuck and the tapered face, balls (22) are provided.
- balls (22) are provided.
- guide grooves (23) in the tapered face of the operating ring.
- examples of guide grooves are shown, wherein V-shape (Fig. 3), semi-circular shape (Fig. 4), approximately U-shape (Fig. 5), approximately U-shape with V-shape in the deepest point (Fig.
- the chuck (21) has a lead passing bore (24), whose rear portion (25) is formed with larger diameter to facilitate the passage of writing lead. Front portion of the lead passing bore may be formed with rough surface such as serration and the like, if required, to grip the lead surely by frictional action.
- the chuck is divided into plural chuck elements (27) by a slit (26) extending in longitudinal direction. In the drawing, chuck elements are provided into two pieces, but three pieces or more may be provided.
- chuck elements On outer faces of chuck elements, there are concave grooves (28) for receiving balls and when balls correspond to relatively narrow portion of tapered face of the operating ring, chuck elements are pressed from their periphery to hold the lead by frictional action. When balls correspond to relatively wide portion of tapered face of the operating ring, chuck elements are released from their peripheral pressure to cease the holding of the lead, which will then become free.
- the rear portion of the chuck is provided with a spring seat (29), in front of which chuck elements are connected with their front ends being openable.
- the chuck is connected with a flexible thin plate (30) which is formed integral with . chuck elements.
- a bent plate (31) which is bending arcuately, as shown in Fig. 7.
- the bent plate shown in the drawing is bent forward, but it may be bent rearward.
- chuck elements may be separately formed and connected by an engaging piece.
- one chuck element is provided with an engaging piece (32) which is extending towards other chuck element, and the tip of the engaging element is engaged in an engaging groove (33) of other chuck element.
- engaging pieces (34), (35) are extending from both chuck elements, and a projection (36) formed on the front portion of one of the engaging piece is engaged with a receiving groove (37) formed on the front portion of other engaging pieces.
- Chuck elements may be connected by means of other member than chuck elements, one example of which is shown in Fig. 10, wherein a locking ring (39) is formed, with its inner face (38) being arcuately formed; a part of inner face of the locking ring is provided with a short projection (40) projecting within the slit; and under the state that the projection is put in the slit, the ring is put on other periphery of chuck elements to connect the same.
- the urging means is a spring (41), whose action is somewhat weaker than that of the spring (10) of the slider means.
- the spring seat is urged rearwardly by the action of the spring, chuck elements, whose front ends are openably connected at the front end of the spring seat, always tend to open their front portions. Since the shift control means of the present invention is formed as mentioned above, the spring seat (29) and the operating ring (20) are always urged in the direction of increasing their distance, balls (22) with rolling contact on outer periphery of the chuck, are urged in a state of facing narrow portion of tapered face of the operating ring (20). Therefore, since chuck elements are usually pressed from periphery, they grip the lead (5) and upon writing, even if the lead is pressed rearwardly, it is never retracted.
- a pushing pipe (43) whose rear end is connected to a lead magazine (42) provided within the main body (1), and front end of the pushing pipe penetrates through the rearward retaining fing (13) provided on the housing barrel (14) and faces a rear end (44) of the chuck (21).
- a spring (45) which is rearwardly urging the pushing pipe.
- a flange (46) At the front end of the pushing pipe, there is a flange (46), which will abut against the retaining ring (13) provided on the housing barrel when the pushing pipe shifts rearwardly.
- the pushing pipe has a leadanserting and passing bore (47), whose front portion is formed with a space (48) which can receive the rear end (44) of the chuck.
- a knocking clip (49) is inserted and a pinch clip (50) of the knocking clip projects outwardly from a slit (51), and when the knocking clip is axially pressed by finger tip, the lead magazine is shifted in axial direction.
- a cylindrical eraser holder (52) with an eraser (53) is inserted, whose outside is provided with a cover (54), which is detachably inserted in the rear end of the main body.
- the writing lead can be supplied to the lead magazine through penetrated bores (55), (56) provided on the holder and knocking clip, after detaching the cover and eraser. And, the lead magazine can be shifted by directly pressing the rear portion of the magazine with knocking piece and the like provided on the rear end of the main body (not shown).
- the writing lead (5) supplied to the lead magazine stops, at first, with its tip reached to the rear portion (25) of larger diameter of the lead passing bore (24) of the chuck (21).
- the knocking clip (49) is knocked to shift the lead magazine forward along axial direction, then the pushing pipe (43) hits against the rear end of the chuck to push the chuck forward.
- the housing barrel (14) which is housing the chuck, the operating ring (20) and the like, is under free state, the housing barrel will advance until it hits against the shoulder (16) of the cap nozzle.
- the chuck remains under the closed state.
- the chuck will advance while rolling balls (22).
- balls correspond to wide portion of the tapered face (19) the lead passing bore (24) will widen and the lead will advance with its own weight until it stops upon hitting against the elastic ring (6) of the slider means, since the chuck always tends to open its front portion.
- the pressing. is ceased, then the pushing -pipe (43) and the lead magazine (42) will return to the original position (retracted position) by the action of the spring (45).
- the housing barrel will be pulled by the flange (46) and returned to the original position (retracted position) when the pushing pipe returns to the original position.
- the chuck returns to the original position (retracted position) by the action of the spring (41).
- the lead is gripped by the inner face of the lead passing bore closed by the action of balls and the tapered face, but its tip remtains abutting on the elastic ring as mentioned above.
- the lead guide sleeve (3) When the tip of lead becomes short by the writing, the lead guide sleeve (3) will hit on paper surface, and by continuing the writing, the guide sleeve will be gradually pressed rearwardly.
- the elastic ring (6) By the shift of the guide sleeve, the elastic ring (6) will retract while sliding on the outer face of the lead together with the lead engaging collet (4).
- the flange (8) of the collet hits on the front end face (11), the shift of the collet stops.
- the elastic ring (6) and the guide sleeve (3) will advance to the advanced position by the action of the spring (lQ together with the collet.
- the lead is also pulled forward, and the chuck (21) also advances against the spring (41) together with the lead, and when balls correspond to wide portion of the tapered face of the operating ring, the tip of the chuck widens to release the grip action on the lead and to allow forward movement of the lead.
- the tip of lead together with the guide sleeve again projects forward direction of the cap nozzle, .:to enable the writing.
- the tip of lead When it is desired to retract the tip of lead, as in the case of usual knocking type mechanical pencil, the tip of lead may be pushed rearward under the state of the knocking clip being knocked.
- FIG. 11 to Fig. 19 An embodiment of other automatic lead feed out mechanical pencil having shift control means according to the present invention is shown in Fig. 11 to Fig. 19. Similar to the above mentioned embodiment, this embodiment is also provided with a main body (101), a slider means screwed within a cap nozzle (102) and a shift control means. This slider means is of nearly the same construction as that of the above mentioned embodiment.
- the collet is fixed on its rear portion with an elastic ring (106) made of elastic material, such as rubber, plastic and the like to hold a writing leand (105) by frictional action, and is inserted shiftably in axial direction into a holding barrel (107) fixed to the cap nozzle.
- an elastic ring (106) made of elastic material, such as rubber, plastic and the like to hold a writing leand (105) by frictional action, and is inserted shiftably in axial direction into a holding barrel (107) fixed to the cap nozzle.
- a spring (110) is provided between a flange (108) provided on the front portion of the collet and a shoulder (109) inward of the holding barrel.
- the collet When the front end of the guide sleeve is pushed forwardly, the collet retract along axial direction until the flange (108) hits on front end face (111) of the holding barrel (107). When the pressure pushing the front end of the guide sleeve is released, the collet will return to its advance position by the spring. Accompanied therewith, the lead held by the elastic ring (106) will advance.
- the shift control means is constructed as follows. Within an inner barrel (112) extending rearward of the cap nozzle, a housing barrel (114) ⁇ whose both ends are fixed with retaining rings (113), (113), is inserted in contact with the inner barrel so as to make a sliding friction. The housing barrel is provided so that it can advance until its front end (115) hits against a shoulder (116) on the cap nozzle. Between its rear end (117) and the base end of a pushing pipe to be under mentioned, a spring (118) is provided and forwardly urged. Inside of the housing barrel, a cylindrical operating ring (120) is inserted, having a tapered face (119), whose inner face is slanting to be fowardly wide and rearwardly narrow.
- a cylindrical chuck (121) is inserted shiftably in axial direction and between outer face of the chuck and the tapered face, balls (122) are provided.
- the chuck (121) has a lead passing bore (124), whose front inner face provided with serration (123) and its rear portion (125) is formed with larger diameter to facilitate passage of the lead.
- the chuck is formed with plural chuck elements (127) to form a longitudinally extending slit (126) (Fig. 14). In this drawing, two pieces of chuck elements are provided.
- chuck elements On outer faces of chuck elements, there are concave grooves (128) for receiving balls and when these balls correspond to relatively narrow portion of tapered face of the operating ring, chuck elements are pressed from their periphery to hold the lead by frictional action. When balls correspond to relatively wide point of tapered face of the operating ring, chuck elements are released from their peripheral pressure to cease the holding of the lead, which will then become free.
- the rear of the chuck is provided with a spring seat (129), in front of which chuck elements are connected with their front ends being openable. As shown in Fig. 14 to Fig.
- the chuck element has on its one side of lead passing bore (124) a projection (130) with its tip being formed round, and has on its other side a receiving groove (131) with its bottom being formed round.
- two chuck elements (127), (127) are made in the same shape, which are combined facing with each other, and projection (130) on one side is engaged with receiving groove (131) on other side.
- the height of the projection (130) is made slightly higher than the depth of receiving groove (131) so that a slit (126) is always formed ranging from front end to rear end between chuck elements (127), (127).
- the spring seat (129) and the operating ring (120) are always urged in the direction of increasing their distance, balls (122) with rolling contact on outer periphery of the chuck, are urged in a state of facing narrow portion of tapered face of the operating ring (120). Since chuck elements are usually pressed from periphery, they grip the lead (105) and upon writing even though the lead is pressed rearwardly, it is never retracted. On the other hand, when the lead is pulled forwardly, the chuck will advance, together with the lead, against the spring (132), and balls (122) will correspond to wide portion of the tapered face. Since chuck elements tend to open at their front portion, the grip action on the lead is released, thus the lead can advance freely.
- a pushing pipe (134) provided with a passing bore (133) for lead (105), and front end of the pushing pipe penetrates through the rearward retaining ring (113) provided on the housing barrel (114) and faces a top cut conical projection (135) on rear end of the chuck (121).
- a spring (118) At the front end of the pushing pipe, there is a flange (136) and within a space (137) formed by the flange, a part of projection (135) of the rear end of the chuck will thrust in.
- the housing barrel (114) When the rear end (138) of the collet (104) leaves from the front end (115) of the housing barrel.(114), the housing barrel (114) will advance due to the action of the spring (118). At that time, the housing barrel (114) will shift with lower speed than the shift speed to the advanced position of the collet (104) due to slide resistance caused between the housing barrel (114) and the inner barrel (112). Thereby, after the collet arrives at the advanced position, the housing barrel will advance until the front end (115) of the housing barrel hits on the shoulder (116) of the cap nozzle under a state that the housing retracts to a state, under which the chuck will grip the lead by the action of the spring (132).
- the lead (105) will project just a little more than the tip of the lead guide sleeve (103) (Fig. 11).
- elastic ring and the like may be fitted on the outer periphery of the housing barrel, which is slidingly contacted with the inner barrel to delay the shift of the housing barrel.
- the lead when at first the lead is supplied to the chuck and the like, it is preferable to supply the lead under a state that the lead guide sleeve is pressed on the paper surface as shown in Fig. 13, Namely, since in the state shown in Fig. 13, the tip of the chuck is under opened state, by dropping lead (105) into the passing bore (133) of the pushing pipe, the lead (105) will advance by its own weight until a position where it hits against the elastic ring (106).
- the lead guide sleeve is released from the paper surface to advance the collet, as mentioned above, after the collet arrives at the advanced position, the chuck will further advance under a state of gripping the lead (105), so that the tip of the lead will enter into the elastic ring (106). Thereafter, the lead guide sleeve is pressed on the paper surface and the operation is repeated, then the lead will advance little by little and will project from the tip of the sleeve under such a state as shown in Fig. 11.
- the present invention is formed as mentioned above and is simply constructed, almost all parts thereof may be made by plastic material and may be economically obtained, except the lead guide sleeve, the housing barrel, balls, springs and the like. And it is to be understood that the housing barrel and other parts may be made with plastic material, and other parts may be formed with metallic material and the like.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP235016/83 | 1983-12-15 | ||
JP23501683A JPS60127197A (ja) | 1983-12-15 | 1983-12-15 | 自動繰出式シヤ−プペンシル |
JP18964984A JPS6168297A (ja) | 1984-09-12 | 1984-09-12 | 自動繰出式シヤ−プペンシル |
JP189649/84 | 1984-09-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0146128A2 true EP0146128A2 (fr) | 1985-06-26 |
EP0146128A3 EP0146128A3 (fr) | 1985-07-24 |
Family
ID=26505588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84115435A Withdrawn EP0146128A3 (fr) | 1983-12-15 | 1984-12-14 | Porte-mine automatique |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0146128A3 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0210350A1 (fr) * | 1985-07-18 | 1987-02-04 | Micro Co., Ltd. | Porte-mine |
EP0268398A1 (fr) * | 1986-10-30 | 1988-05-25 | KOTOBUKI & CO., LTD. | Pince de serrage pour un porte-mine |
EP0287237A1 (fr) * | 1987-04-17 | 1988-10-19 | KOTOBUKI & CO., LTD. | Porte-mine |
US4896982A (en) * | 1985-08-20 | 1990-01-30 | Kotobuki & Co. Ltd. | Lead feed mechanism for mechanical pencil |
FR2765149A1 (fr) * | 1997-06-30 | 1998-12-31 | Val De Marne Atel Du | Crayon porte-mines |
EP2033806A1 (fr) * | 2006-06-05 | 2009-03-11 | MITSUBISHI PENCIL Co., Ltd. | Crayon mécanique |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2001011A (en) * | 1977-07-12 | 1979-01-24 | Faber Castell A W | Propelling pencil |
EP0088318A2 (fr) * | 1982-03-05 | 1983-09-14 | A.W. Faber - Castell | Porte-mines avec avance automatique de la mine provoquée par la pression d'écriture |
-
1984
- 1984-12-14 EP EP84115435A patent/EP0146128A3/fr not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2001011A (en) * | 1977-07-12 | 1979-01-24 | Faber Castell A W | Propelling pencil |
EP0088318A2 (fr) * | 1982-03-05 | 1983-09-14 | A.W. Faber - Castell | Porte-mines avec avance automatique de la mine provoquée par la pression d'écriture |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0210350A1 (fr) * | 1985-07-18 | 1987-02-04 | Micro Co., Ltd. | Porte-mine |
US4896982A (en) * | 1985-08-20 | 1990-01-30 | Kotobuki & Co. Ltd. | Lead feed mechanism for mechanical pencil |
EP0268398A1 (fr) * | 1986-10-30 | 1988-05-25 | KOTOBUKI & CO., LTD. | Pince de serrage pour un porte-mine |
EP0383412A2 (fr) * | 1986-10-30 | 1990-08-22 | KOTOBUKI & CO., LTD. | Pince de serrage pour un porte-mine |
EP0383412A3 (fr) * | 1986-10-30 | 1991-04-24 | KOTOBUKI & CO., LTD. | Pince de serrage pour un porte-mine |
EP0287237A1 (fr) * | 1987-04-17 | 1988-10-19 | KOTOBUKI & CO., LTD. | Porte-mine |
FR2765149A1 (fr) * | 1997-06-30 | 1998-12-31 | Val De Marne Atel Du | Crayon porte-mines |
EP2033806A1 (fr) * | 2006-06-05 | 2009-03-11 | MITSUBISHI PENCIL Co., Ltd. | Crayon mécanique |
EP2033806A4 (fr) * | 2006-06-05 | 2012-05-09 | Mitsubishi Pencil Co | Crayon mécanique |
Also Published As
Publication number | Publication date |
---|---|
EP0146128A3 (fr) | 1985-07-24 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT |
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AK | Designated contracting states |
Designated state(s): DE FR GB IT |
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17P | Request for examination filed |
Effective date: 19850911 |
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17Q | First examination report despatched |
Effective date: 19860827 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19880830 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SHIMA, SYOUZO |