EP0151456B1 - Füllbleistift - Google Patents

Füllbleistift Download PDF

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Publication number
EP0151456B1
EP0151456B1 EP19850100907 EP85100907A EP0151456B1 EP 0151456 B1 EP0151456 B1 EP 0151456B1 EP 19850100907 EP19850100907 EP 19850100907 EP 85100907 A EP85100907 A EP 85100907A EP 0151456 B1 EP0151456 B1 EP 0151456B1
Authority
EP
European Patent Office
Prior art keywords
lead
barrel
advance
tip
spring
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 - Lifetime
Application number
EP19850100907
Other languages
English (en)
French (fr)
Other versions
EP0151456A3 (en
EP0151456A2 (de
Inventor
Curtis L. Malm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gillette Co LLC
Original Assignee
Gillette Co LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gillette Co LLC filed Critical Gillette Co LLC
Publication of EP0151456A2 publication Critical patent/EP0151456A2/de
Publication of EP0151456A3 publication Critical patent/EP0151456A3/en
Application granted granted Critical
Publication of EP0151456B1 publication Critical patent/EP0151456B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B43K21/08—Writing-core feeding mechanisms with the writing-cores fed by screws

Definitions

  • a mechanical pencil including a hollow barrel, a tip rotatably mounted in said barrel, a helical spring axially within the bareel and keyed to the tip, a lead advance-retract member located within the helical spring for carrying a lead and having a radial lug passing between the turns of the helix of the spring, the lug being guided in a longitudinal guide in the inner wall of the barrel, such that relative rotational movement between the barrel and the tip is converted to a longitundinal movement of the lead advance-retract member (preamble of claim 1).
  • the radial lug is formed from the trailing end of the advance-retract member, which is bent over at right angles, thereby passing between the turns of the helical spring.
  • the lug serves to prevent rotation of the advance-retract member with respect to the hollow barrel but it does not provide any lateral positioning of the lead.
  • the spring and advance-retract member are free to float about laterally within the housing but in document CH-A-266391 they are held by the fact that the spring is a tight fit in the housing.
  • the longitudinal guide consists of a plurality of spaced apart longitudinal grooves and the lead advance-retract member has a plurality of radially and axially spaced lugs for engaging said grooves and co-operating with the helix of the spring.
  • the lateral stability problem is solved but the provision of axially spaced lugs gives rise to assembly problems.
  • the invention provides that a rearwardly disposed one of the lugs has a forwardly extending projection at its radially outermost end so that during assembly of the pencil the forward most lug and said projection align simultaneously with the longitudinal grooves.
  • the forward end of the advance-retract member includes a lead-holding bore to retain frictionally the end portion of the lead.
  • a mechanical pencil has essentially five parts, a hollow barrel 10, a rotatable tip 20, a lead advance-retract member 30, a helical metal spring 40, and an eraser or barrel plug 50.
  • the hollow barrel 10 of the mechanical pen comprises a forward end 12 terminated by a bore portion of reduced inside diameter 14 and a rearward end 16 terminated by a bore portion of increased diameter 17 within which are located dimples 22 which serve to frictionally retain eraser 50.
  • Mounted near the rearward end of barrel 10 is integrally molded clip member 18, which serves to retain the mechanical pencil in a pocket or the like when it is not in use.
  • helical spring 40 typically of metal, lead advance-retract member 30, and lead 24.
  • longitudinal grooves 32 Located on the inner wall of hollow barrel 10 are longitudinal grooves 32, the purpose of which will be made clear hereinafter.
  • tip 20 comprises conical forward portion 34 bearing finger-gripping grooves 38 (best seen in Figure 1) and terminating at shoulder 36.
  • Rearward portion 44 of tip 20 comprises skirt 46 split by slots 48 and which bears lugs 50 to form a discontinuous shoulder which during assembly abuts shoulder 15 formed by bore portion of reduced inside diameter 14.
  • Lead advance-retract mechanism 30 comprises forward end 54 within which is located lead holding bore 56 within which is frictionally retained lead 24.
  • lugs 60 and 61 Mounted on rearward end 58 of lead advance-retract member 30 are lugs 60 and 61.
  • the lugs are spaced radially and axially to cooperate with the helix of the spring. They also mate and are guided within barrel grooves 32 as shown best in Figure 4.
  • Contiguous with a lug 61 is lug lead portion consisting of a forwardly extending projection 62 at its radially outermost end which serves to reduce assembly problems by insuring that both of the lugs 60 and 61 are simultaneously aligned with grooves 32 during assembly.
  • helical spring 40 Located axially within the bore of hollow barrel 10 is helical spring 40 which comprises forward portion 64 which is terminated by turns of reduced pitch 66 which are keyed by frictional engagement with hollow bore of tip 20 and rearward portion 68 terminated by open turn 70.
  • barrel 10 and tip 20 are rotated with respect to each other.
  • spring 40 is caused to rotate with tip 20 by virtue of the friction fit of spring turns of reduced pitch 66.
  • lead advance-retract member 30 is caused to rotate with barrel 10 by the keying action of lugs 61 and longitudinal grooves 32 on the inner wall of the barrel.
  • the rotational movement of tip 20 and helical spring 40 is converted to longitudinal movement of lead advance-retract member 30 as the rotating turns of the spring bear upon lug 60 as shown in Figure 2.

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)

Claims (2)

1. Mechanischer Bleistift mit einem hohlen Schaft (10), einer in dem Schaft (10) drehbar gelagerten Spitze (20), einer in dem Schaft axial angeordneten und mit der Spitze (20) drehfest verbundenen Schraubenfeder (40), einem in der Schraubenfeder (40) angeordneten Minenvorschiebe- und -rückziehglied (30), das zum Tragen einer Mine dient und einen radialen Lappen (60, 61) besitzt, der zwischen den Windungen der Wendel der Feder (40) hindurchtritt und in einer Längsführung (32) in der Innenwandung des Schaftes (10) geführt ist, so daß eine relative Drehbewegung zwischen dem Schaft (10) und der Spitze (20) in eine Längsbewegung des Minenvorschiebe- und -rückziehgliedes (30) umgesetzt wird,
dadurch gekennzeichnet, daß die Längsführung (32) aus einer Mehrzahl von im Abstand voneinander angeordneten Längsnuten (32) besteht und daß das Minenvorschiebe- und -rückziehglied (30) eine Mehrzahl von radial und axial im Abstand voneinander angeordneten Lappen (60, 61) zum Eingriff in die Nuten (32) und zum Zusammenwirken mit der Wendel der Feder (40) besitzt und daß
ein hinten angeordneter (61) dieser Lappen an seinem radial am weitesten auswärtsgelegenen Ende einen vorwärtsgerichteten Vorsprung (62) besitzt, so daß beim Zusammensetzen des Bleistifts der vorderste Lappen (60) und der genannte Vorsprung (62) gleichzeitig mit den Längsnuten (32) gefluchtet werden und
das Vorschiebe- und Rückziehglied (30) an seinem vorderen Ende eine Minenhaltebohrung (56) zum reibungsschlüssigen Halten des Endteils der Mine (24) besitzt.
2. Mechanischer Bleistift nach Anspruch 1, dadurch gekennzeichnet, daß die Schraubenfeder (40) durch Reibungsschluß mit der Spitze (20) drehfest verbunden ist.
EP19850100907 1984-02-09 1985-01-29 Füllbleistift Expired - Lifetime EP0151456B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US57873484A 1984-02-09 1984-02-09
US578734 1984-02-09

Publications (3)

Publication Number Publication Date
EP0151456A2 EP0151456A2 (de) 1985-08-14
EP0151456A3 EP0151456A3 (en) 1987-02-04
EP0151456B1 true EP0151456B1 (de) 1990-05-23

Family

ID=24314080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850100907 Expired - Lifetime EP0151456B1 (de) 1984-02-09 1985-01-29 Füllbleistift

Country Status (4)

Country Link
EP (1) EP0151456B1 (de)
JP (1) JPS60233000A (de)
CA (1) CA1219555A (de)
DE (1) DE3577825D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210587B (en) * 1987-10-20 1992-04-01 Mitsubishi Pencil Co A mechanical pencil.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA463498A (en) * 1950-03-07 E. Wehn Charles Mechanical pencil
DE478303C (de) * 1929-06-22 Huck Fa H Schreibstift
US1627602A (en) * 1921-04-29 1927-05-10 Byron B Goldsmith Mechanical pencil
DE454572C (de) * 1925-03-10 1928-01-12 Felss Geb Schreibstift
CH266391A (de) * 1948-03-09 1950-01-31 Gyger Fritz Minenstift.
JPS5040329U (de) * 1973-08-06 1975-04-24
US4136980A (en) * 1977-04-12 1979-01-30 Tae Yoon Leem Mechanical pencil
JPS55144086U (de) * 1979-04-03 1980-10-16

Also Published As

Publication number Publication date
EP0151456A3 (en) 1987-02-04
CA1219555A (en) 1987-03-24
JPS60233000A (ja) 1985-11-19
EP0151456A2 (de) 1985-08-14
DE3577825D1 (de) 1990-06-28
JPH0557920B2 (de) 1993-08-25

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