EP0032651B1 - Push type mechanical pencil - Google Patents
Push type mechanical pencil Download PDFInfo
- Publication number
- EP0032651B1 EP0032651B1 EP80710001A EP80710001A EP0032651B1 EP 0032651 B1 EP0032651 B1 EP 0032651B1 EP 80710001 A EP80710001 A EP 80710001A EP 80710001 A EP80710001 A EP 80710001A EP 0032651 B1 EP0032651 B1 EP 0032651B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lead
- chuck
- guide member
- type mechanical
- 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.)
- Expired
Links
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
- B43K21/16—Writing-core feeding mechanisms with stepwise feed of writing-cores
- B43K21/20—Writing-core feeding mechanisms with stepwise feed of writing-cores with writing-cores automatically replaced from magazines
Definitions
- the invention relates to a push type mechanical pencil having a push button on a holder body for pushing the lead into the writing position.
- a push type mechanical pencil is known in accordance with the prior art portion of claim 1 (e.g. DE-C 18 15 535).
- the push button In such a known pencil, also shown in Fig. 1 of the present application, the push button must be pressed down strongly or more times to bring the lead into the correct writing position. The user of such a pencil cannot be sure that the lead is in the correct writing position after having pressed down the push button. Therefore he has to check the writing position before writing and often has to press down the push button again.
- the advantage offered by the invention is that the lead is brought into the correct writing position when the push button is actuated only one time by a light finger tip. Therefore the pencil can be brought very quick into the writing position at the' beginning of the writing and also during the writing when the lead is used up. All in all, the use of the mechanical pencil is very comfortable.
- FIGS. 1 and 2 show a holder body having a main shaft 11 and an end portion 5 of conical form which is connected by a screw sleeve 8 with the main shaft 11.
- a push button 12 is inserted displaceable in an opening and releasable connected with a lead supply tube 10.
- this tube 10 At the front end of this tube 10 a shoulder 10' is provided for abutment of a spring 9 which rests on this screw sleeve 8 and presses the push button 12 on the supply tube 10 in the shown projecting position.
- a shaft 13 is fixed with the bore for a lead 4.
- This shaft 13 extends through the screw sleeve 8 and is provided at the free end with a chuck 7.
- This chuck 7 is provided with slots in the enlarged end portion of the shaft 13, e.g. three slots are provided so that the chuck has three clamp jaws.
- the outer diameter of the chuck 7 is conically enlarged in direction to the front end.
- a clutch ring 6 is inserted on the front end of which the clamp jaws of the chuck 7 abut.
- the clamp jaws are pressed by the force of the spring 9 against this clutch ring 6, so that these jaws which are elastic are pressed together and hold the lead 4 by clamping it there between.
- the chuck 7 is released from the clutch ring 6 so that the clamp jaws of the chuck move outwardly due to their own elasticity giving free the lead in the bore of the shaft 13.
- a lead guide member 3 is displaceably inserted in a bore, the diameter of which is greater than this one of the chuck 7.
- This lead guide member 3 is provided with a lead brake 2.
- This lead brake 2 can be made from rubber which is provided with a bore, the diameter of which is slightly smaller than the outer diameter of the lead 4.
- This lead brake 2 has an enlarged opening for facilitating the introduction of the lead 4 into the bore of the lead brake.
- a lead protecting tube 1 is fixed which is guided in a bore in the front end of the holder end portion 5.
- the lead guide member 3 is displaceable in the corresponding bore from the shown resting position into the writing position of the lead until this guide member 3 abuts on the shoulder 14 at the end of this bore.
- the front end of the chuck 7 lies against the end surface of the guide member 3.
- This end surface of the guide member is perpendicular to the longitudinal axis of the guide member as well as the surface on the front end of the chuck 7.
- the maximum diameter of this funnel shape opening 15 is greater than the outer diameter of the chuck 7 when the clamp jaws are held together by the clutch ring 6.
- the front ends of the clamp jaws lie against the inner surface of this funnel shape opening 15 in the shown resting position.
- This inner surface of the opening 15 is inclined with respect to the longitudinal axis in such a way that the diameter of this funnel shape opening 15 becomes smaller in direction to the front end of the pencil.
- the guide member 3 In the shown resting position the guide member 3 is spaced apart from the shoulder 14 and the outer front edge of the clamp jaws of the chuck 7 lies against the funnel shape surface of the opening 15 to a certain depth of this opening 15 so that a force is exerted to the guide member 3 in front direction when the clamp jaws of the chuck 7 spread out due to their elasticity in radial direction.
- the protecting tube 1 surrounding the lead 4 is shifted back into the end portion 5 together with the guide member 3 to such an extent as the lead 4 is used up during writing.
- the push button 12 is pressed down.
- the lead 4 is slightly pressed against the sheet of paper or against the finger tip. In this way, the lead as well as the protecting tube 1 go easily back into the holding body of the pencil.
- the guide member 3 can be easily displaced in the corresponding bore of the end portion 5.
- Fig. 3 shows schematically another embodiment according to the invention.
- the means for transforming the radial directed spring force of the chuck 7 into an axial directed force on the lead guide member 3, which in the embodiment according to Fig. 2 is the inclined inner surface of the opening 15, are formed in the embodiment of Fig. 3, by two arm levers 16 which are pivoted e.g. on the holder body.
- the levers 16 are angle levers, the two arms of which can be arranged perpendicularly with respect to each other.
- the one arm of the angle levers 16 is actuated by the clamp jaws of the chuck 7 in radial direction so that the other arms of the angle levers push against the rear end of the lead guide member 3 in axial direction.
Abstract
Description
- The invention relates to a push type mechanical pencil having a push button on a holder body for pushing the lead into the writing position.
- A push type mechanical pencil is known in accordance with the prior art portion of claim 1 (e.g. DE-C 18 15 535). In such a known pencil, also shown in Fig. 1 of the present application, the push button must be pressed down strongly or more times to bring the lead into the correct writing position. The user of such a pencil cannot be sure that the lead is in the correct writing position after having pressed down the push button. Therefore he has to check the writing position before writing and often has to press down the push button again.
- The advantage offered by the invention is that the lead is brought into the correct writing position when the push button is actuated only one time by a light finger tip. Therefore the pencil can be brought very quick into the writing position at the' beginning of the writing and also during the writing when the lead is used up. All in all, the use of the mechanical pencil is very comfortable.
- One way of carrying out the invention is described in detail below with reference to drawings which illustrate two embodiments in which:
- Fig. 1 is a longitudinal section of a known push type mechanical pencil,
- Fig. 2 shows an inventive embodiment of such a known pencil according to Fig. 1 in the same view,
- Fig. 3 is a schematic view of another inventive embodiment.
- The Figures 1 and 2 show a holder body having a main shaft 11 and an end portion 5 of conical form which is connected by a
screw sleeve 8 with the main shaft 11. At the other end of the main shaft 11 apush button 12 is inserted displaceable in an opening and releasable connected with alead supply tube 10. - At the front end of this tube 10 a shoulder 10' is provided for abutment of a
spring 9 which rests on thisscrew sleeve 8 and presses thepush button 12 on thesupply tube 10 in the shown projecting position. - At the front end of the supply tube 10 a shaft 13 is fixed with the bore for a
lead 4. This shaft 13 extends through thescrew sleeve 8 and is provided at the free end with achuck 7. Thischuck 7 is provided with slots in the enlarged end portion of the shaft 13, e.g. three slots are provided so that the chuck has three clamp jaws. In the shown embodiment the outer diameter of thechuck 7 is conically enlarged in direction to the front end. - In the front end of this
screw sleeve 8, aclutch ring 6 is inserted on the front end of which the clamp jaws of thechuck 7 abut. The clamp jaws are pressed by the force of thespring 9 against thisclutch ring 6, so that these jaws which are elastic are pressed together and hold thelead 4 by clamping it there between. By pressing down thepush button 12, thechuck 7 is released from theclutch ring 6 so that the clamp jaws of the chuck move outwardly due to their own elasticity giving free the lead in the bore of the shaft 13. - In the conical end portion 5 of the holder body a
lead guide member 3 is displaceably inserted in a bore, the diameter of which is greater than this one of thechuck 7. Thislead guide member 3 is provided with alead brake 2. Thislead brake 2 can be made from rubber which is provided with a bore, the diameter of which is slightly smaller than the outer diameter of thelead 4. Thislead brake 2 has an enlarged opening for facilitating the introduction of thelead 4 into the bore of the lead brake. At the front end of thelead guide member 3, a lead protecting tube 1 is fixed which is guided in a bore in the front end of the holder end portion 5. Thelead guide member 3 is displaceable in the corresponding bore from the shown resting position into the writing position of the lead until thisguide member 3 abuts on theshoulder 14 at the end of this bore. - In the known embodiment according to the Fig. 1 the front end of the
chuck 7 lies against the end surface of theguide member 3. This end surface of the guide member is perpendicular to the longitudinal axis of the guide member as well as the surface on the front end of thechuck 7. By pushing down thepush button 12, thechuck 7 is released from theclutch ring 6 whereby theguide member 3 is displaced forwardly together with thelead 4 by thechuck 7, the clamp jaws of which are opened by sliding on the end surface of theguide member 3 perpendicular to the longitudinal axis. The displacement of theguide member 3 and therefore of thelead 4 into the writing position depends on the degree of pressing down thepush button 12. - According to the inventive embodiment shown in Fig. 2, there is provided a funnel shape opening 15 in the
lead guide member 3. The maximum diameter of this funnel shape opening 15 is greater than the outer diameter of thechuck 7 when the clamp jaws are held together by theclutch ring 6. The front ends of the clamp jaws lie against the inner surface of this funnel shape opening 15 in the shown resting position. This inner surface of theopening 15 is inclined with respect to the longitudinal axis in such a way that the diameter of this funnel shape opening 15 becomes smaller in direction to the front end of the pencil. In the shown resting position theguide member 3 is spaced apart from theshoulder 14 and the outer front edge of the clamp jaws of thechuck 7 lies against the funnel shape surface of theopening 15 to a certain depth of this opening 15 so that a force is exerted to theguide member 3 in front direction when the clamp jaws of thechuck 7 spread out due to their elasticity in radial direction. - When the
push button 12 of the inventive embodiment is pressed down only a small distance the elastic clamp jaws of thechuck 7 come free from theclutch ring 6 so that they snap outwardly in radial direction. During this snap action, the clamp jaws press against the inclined surface of the funnel shape opening 15 with their spring force so that the component of this spring force of the clamp jaws directed to the front end pushes theguide member 3 together with thelead 4 into the correct writing position determined by theshoulder 14 in the end portion 5 of the holder body. After releasing thepush button 12, thechuck 7 is retracted into theclutch ring 6 by thespring 9 so that thelead 4 is held in the writing position. - During writing, the protecting tube 1 surrounding the
lead 4 is shifted back into the end portion 5 together with theguide member 3 to such an extent as thelead 4 is used up during writing. When thelead 4 together with the protecting tube 1 should be shifted back into the pencil without writing, thepush button 12 is pressed down. Thelead 4 is slightly pressed against the sheet of paper or against the finger tip. In this way, the lead as well as the protecting tube 1 go easily back into the holding body of the pencil. - The
guide member 3 can be easily displaced in the corresponding bore of the end portion 5. - Fig. 3 shows schematically another embodiment according to the invention. The means for transforming the radial directed spring force of the
chuck 7 into an axial directed force on thelead guide member 3, which in the embodiment according to Fig. 2 is the inclined inner surface of theopening 15, are formed in the embodiment of Fig. 3, by two arm levers 16 which are pivoted e.g. on the holder body. Thelevers 16 are angle levers, the two arms of which can be arranged perpendicularly with respect to each other. The one arm of theangle levers 16 is actuated by the clamp jaws of thechuck 7 in radial direction so that the other arms of the angle levers push against the rear end of thelead guide member 3 in axial direction. - In the embodiment according to Fig. 3 no protecting tube is fixed on the
lead guide member 3, however, such a protecting tube can be provided.
Claims (5)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8080710001T DE3062996D1 (en) | 1980-01-17 | 1980-01-17 | Push type mechanical pencil |
AT80710001T ATE3261T1 (en) | 1980-01-17 | 1980-01-17 | MECHANICAL BLOCKING PEN. |
EP80710001A EP0032651B1 (en) | 1980-01-17 | 1980-01-17 | Push type mechanical pencil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP80710001A EP0032651B1 (en) | 1980-01-17 | 1980-01-17 | Push type mechanical pencil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0032651A1 EP0032651A1 (en) | 1981-07-29 |
EP0032651B1 true EP0032651B1 (en) | 1983-05-11 |
Family
ID=8187436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80710001A Expired EP0032651B1 (en) | 1980-01-17 | 1980-01-17 | Push type mechanical pencil |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0032651B1 (en) |
AT (1) | ATE3261T1 (en) |
DE (1) | DE3062996D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWM434485U (en) * | 2011-11-15 | 2012-08-01 | zhen-quan Wu | Bouncing device and telescopic drawing bar applied therewith |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1702780A (en) * | 1925-07-07 | 1929-02-19 | Robt H Ingersoll Inc | Mechanical pencil |
US2370250A (en) * | 1943-09-03 | 1945-02-27 | Joseph F Kupczyk | Mechanical pencil |
US3864046A (en) * | 1973-02-16 | 1975-02-04 | Kemal Butka | Mechanical pencil, especially for thin leads |
US4270870A (en) * | 1977-05-22 | 1981-06-02 | Ancos Co., Ltd. | Mechanical pencil with chuck closing by normal writing grip |
-
1980
- 1980-01-17 DE DE8080710001T patent/DE3062996D1/en not_active Expired
- 1980-01-17 EP EP80710001A patent/EP0032651B1/en not_active Expired
- 1980-01-17 AT AT80710001T patent/ATE3261T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0032651A1 (en) | 1981-07-29 |
ATE3261T1 (en) | 1983-05-15 |
DE3062996D1 (en) | 1983-06-16 |
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