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US1606909A - Mechanical pencil - Google Patents

Mechanical pencil Download PDF

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Publication number
US1606909A
US1606909A US676703A US67670323A US1606909A US 1606909 A US1606909 A US 1606909A US 676703 A US676703 A US 676703A US 67670323 A US67670323 A US 67670323A US 1606909 A US1606909 A US 1606909A
Authority
US
United States
Prior art keywords
tip
lead
ribs
mechanical pencil
bore
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
US676703A
Inventor
John C Wahl
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.)
Wahl Co
Original Assignee
Wahl Co
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
Priority to NL17872D priority Critical patent/NL17872C/xx
Application filed by Wahl Co filed Critical Wahl Co
Priority to US676703A priority patent/US1606909A/en
Priority to GB18180/24A priority patent/GB225170A/en
Priority to CH112814D priority patent/CH112814A/en
Priority to DEW66787D priority patent/DE426979C/en
Priority to FR586182D priority patent/FR586182A/en
Application granted granted Critical
Publication of US1606909A publication Critical patent/US1606909A/en
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
    • B43K21/22—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
    • B43K21/003—Propelling pencils with lead sections or lead cartridges
    • 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
    • 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
    • B43K21/085—Writing-core feeding mechanisms with the writing-cores fed by screws with a threaded propelling shank

Definitions

  • This invention relates to improvements in mechanical pencils of the type in which the lead is pro elled through a ribbed tip which supports t ie lead and prevents it from rotating in the pencil. In passing through the tip the ribs therein cut into the lead and pro-.
  • Figure 1 is a View, artially in longitu' dinal section and partia ly in elevation, of a mechanical pencil with the tip according to the present invention attached thereto.
  • Figure 2 is a view in longitudinal section of the improved tip and co-related parts.
  • Figure 3 is a view taken on the line 3-3 M of Figure 2 looking in the direction of thearrows.
  • Figure 4 is a view of the tip according to this invention, showing the same perspective detached from the other parts of the pencil.
  • numeral 1 indicates an outer barrel of a mechanical pencil tapered at one end to form a seat for atip 2.
  • Numeral 3 indicates a threaded inner sleeve which is swedged at one end to form a lead guide 4 to which the tip is adapted to be attached through the means of threaded engagement.
  • the lead propelling mechanism 5 is mounted within the tube 3. and the cross head 6 cooperates with the interior threads on the tube 3 to propel a lead 7 through the tip.
  • the tip 2 has a passageway 8 therein,
  • the aperture in the lower andsmaller end of the tip 2 is milled in a generally triangular shape, as is illustrated in Figure 3, and ribs 10 are formed on the flat sides of the triangle. These ribs 10 project into theap- ,erture of the tip and act to bite 'into the lead 7 as it is forced into the tip 2 by the propelling mechanism, thus preventing the the end of the tip 2, thus preventing this dust from gathering around and above the ribs 10, and packing firmly in the tip 2 and finally clogging up the tip.
  • a tip having a bore't'herein for the passage of a lead, ribs in said bore adapted to cut into said lead,
  • a tip having a bore therein for the passage of a circular lead, ribs in said bore adapted to cut into said lead, said bore being at its lowermost end of general triangular form whereby the surface of said bore between said ribs is separated from the lead to provide spaces alon side the lead to permit the escape from the tip of the dust cut fromthe leadby said ribs.

Landscapes

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

Description

Nov. 16 1926.
J. c. WAHL MECHANICAL PENCIL Filed Nov. 24. 1923 I'I I1 I. III. I n! I11. I. l I, I
WWMMMMMMW PimmE AI lllll l I Patented Nov. 16, 1926.
UNITED, STATES PATENT OFFICE.
JOHN cQwant, or onrcaeo, rumors, assmnon 'ro THE WAI-IL couranmor cmcaeo, rumors, a; conronarron or DELAWARE.
amcnamcn. rENcI Application filed November 24. 1923. Serial No. 676,703.
This invention relates to improvements in mechanical pencils of the type in which the lead is pro elled through a ribbed tip which supports t ie lead and prevents it from rotating in the pencil. In passing through the tip the ribs therein cut into the lead and pro-.
Figure 1 is a View, artially in longitu' dinal section and partia ly in elevation, of a mechanical pencil with the tip according to the present invention attached thereto.
Figure 2 is a view in longitudinal section of the improved tip and co-related parts. a
Figure 3 is a view taken on the line 3-3 M of Figure 2 looking in the direction of thearrows.
Figure 4 is a view of the tip according to this invention, showing the same perspective detached from the other parts of the pencil.
Figure dis a sectional view on an enlarged scale of the end of the tip with no lead therein. I
In the drawings numeral 1 indicates an outer barrel of a mechanical pencil tapered at one end to form a seat for atip 2. Numeral 3 indicates a threaded inner sleeve which is swedged at one end to form a lead guide 4 to which the tip is adapted to be attached through the means of threaded engagement.
The lead propelling mechanism 5 is mounted within the tube 3. and the cross head 6 cooperates with the interior threads on the tube 3 to propel a lead 7 through the tip. The tip 2 has a passageway 8 therein,
threaded at its uppermost extremity as at 9 to engage the external threads on the lower end of the lead guide 4.
The aperture in the lower andsmaller end of the tip 2 is milled in a generally triangular shape, as is illustrated in Figure 3, and ribs 10 are formed on the flat sides of the triangle. These ribs 10 project into theap- ,erture of the tip and act to bite 'into the lead 7 as it is forced into the tip 2 by the propelling mechanism, thus preventing the the end of the tip 2, thus preventing this dust from gathering around and above the ribs 10, and packing firmly in the tip 2 and finally clogging up the tip.
Havingidescribed my invention, what I claim as new and desire tosecure by Letters Patent is:
1. Ina mechanical pencil, a tip having a bore't'herein for the passage of a lead, ribs in said bore adapted to cut into said lead,
the surface of said bore between said ribs being separated from the lead to provide lougitudinal spaces alongsideof the lead and extending to the end of the tip to permit the escape from the tip of the dust cut from the lead by said ribs.
2. In a mechanical pencil. a tip having a bore therein for the passage of a circular lead, ribs in said bore adapted to cut into said lead, said bore being at its lowermost end of general triangular form whereby the surface of said bore between said ribs is separated from the lead to provide spaces alon side the lead to permit the escape from the tip of the dust cut fromthe leadby said ribs. 1
4 In witness whereof, I have hereuutosub-
US676703A 1923-09-26 1923-11-24 Mechanical pencil Expired - Lifetime US1606909A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL17872D NL17872C (en) 1923-11-24
US676703A US1606909A (en) 1923-11-24 1923-11-24 Mechanical pencil
GB18180/24A GB225170A (en) 1923-11-24 1924-07-30 Improvements in mechanical pencils
CH112814D CH112814A (en) 1923-11-24 1924-08-04 Mechanical pen.
DEW66787D DE426979C (en) 1923-11-24 1924-08-08 Pen, the tip of which is provided with horizontal grooves to hold the lead
FR586182D FR586182A (en) 1923-09-26 1924-08-27 Improvements with mechanical pencils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US676703A US1606909A (en) 1923-11-24 1923-11-24 Mechanical pencil

Publications (1)

Publication Number Publication Date
US1606909A true US1606909A (en) 1926-11-16

Family

ID=24715626

Family Applications (1)

Application Number Title Priority Date Filing Date
US676703A Expired - Lifetime US1606909A (en) 1923-09-26 1923-11-24 Mechanical pencil

Country Status (5)

Country Link
US (1) US1606909A (en)
CH (1) CH112814A (en)
DE (1) DE426979C (en)
GB (1) GB225170A (en)
NL (1) NL17872C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2638074A (en) * 1948-09-03 1953-05-12 Joseph Dixon Crucible Co Mechanical pencil with spiral feeding means
US2933065A (en) * 1956-12-24 1960-04-19 Staedtler J S Gripping member for propeller pencils
US4919556A (en) * 1988-01-15 1990-04-24 Pencell Co., Ltd. Writing implement having simplified lead-feeding mechanism
US5791798A (en) * 1995-05-19 1998-08-11 Yu; Li Hua Multi-purpose writing instrument
US5944435A (en) * 1997-11-03 1999-08-31 Chai; David Ching-Her Mechanical pencil structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2638074A (en) * 1948-09-03 1953-05-12 Joseph Dixon Crucible Co Mechanical pencil with spiral feeding means
US2933065A (en) * 1956-12-24 1960-04-19 Staedtler J S Gripping member for propeller pencils
US4919556A (en) * 1988-01-15 1990-04-24 Pencell Co., Ltd. Writing implement having simplified lead-feeding mechanism
US5791798A (en) * 1995-05-19 1998-08-11 Yu; Li Hua Multi-purpose writing instrument
US5944435A (en) * 1997-11-03 1999-08-31 Chai; David Ching-Her Mechanical pencil structure

Also Published As

Publication number Publication date
DE426979C (en) 1926-03-23
NL17872C (en)
CH112814A (en) 1925-12-01
GB225170A (en) 1925-03-12

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