US2552402A - Apparatus for sharpening pencil refills - Google Patents

Apparatus for sharpening pencil refills Download PDF

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Publication number
US2552402A
US2552402A US735317A US73531747A US2552402A US 2552402 A US2552402 A US 2552402A US 735317 A US735317 A US 735317A US 73531747 A US73531747 A US 73531747A US 2552402 A US2552402 A US 2552402A
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United States
Prior art keywords
refill
sleeve
holder
sharpening
file
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Expired - Lifetime
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US735317A
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English (en)
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Buser Hans
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L23/00—Sharpeners for pencils or leads
    • B43L23/006—Sharpeners for pencils or leads with rasping surfaces

Definitions

  • FIG. 2 APPARATUS FOR SHARPENING PENCIL REFILLS Filed March 18, 1947 FIG. I FIG. 2
  • Patented May 8, 1951 REFILLS Hans Buser, Zurich, Switzerland I Application March 18, 1947, Serial No. 735,317 In Switzerland December. 29, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires December 29, 1964 Claims.
  • the present invention relates to an apparatus ,for sharpening pencil refills having means proof contact in different directions or in the Ambirection but at different speeds.
  • Figure 1 is a cross-sectional view of one embodiment of the invention
  • Figure 2 is a longitudinal section of the embodiment of Figure 1;
  • Figure 3 is a cross-sectional view on the line wa of Figure 4;
  • Figure 4 is a, horizontal sectional view of a second constructional embodiment
  • Figure 5 is a horizontal sectional view on the line 22-12 of Figure 1, and
  • Figure 6 illustrates a detail
  • the pencil-refill rests for sharpening purposes only due to the weight of the refill-holder 5, on the friction-surface of a slanting file I, which is attached by means of two connecting pieces 2 to a slide 7.
  • the slide 1 can be moved to and fro in the longitudinal direction in the casing a ( Figure 1) and in the course of this movement carries the file with it.
  • the slide 1 serves as driving means.
  • This sleeve 4a is arranged in vertical or approximately vertical position in a holder on the casing 8 and is rotatably mounted therein.
  • the refill-holder 5 of a pencil-refill can be inserted in the sleeve 4a until the tip of the refill rests against the file l.
  • the refill-holder 5 is secured against twisting in the sleeve 4a by means of a sexagonal holder having three set screws l3 arranged radially in the sleeve ( Figures 1 and 5), which are distributed at even distances over the periphery thereof.
  • These screws I 3 are set in such a way that the refill-holder can slip down the sleeve by virtue of its own weight until the tip of the refill rests against the file I.
  • In the pinion 4 of the sleeve 4a there is a hole which 2 serves to limit the depth to which the refill-holder can fall and thus prevents any damaging of the latter.
  • a centered bore is provided as clearly shown in Figure 6 in the lower part, i. e. in the pinion part of the sleeve 4a, which bore corresponds to the diameter of the refill. This serves to center the refill and at the same time limit the depth to which-the refillholder 5 can fall.
  • the casingv 8 is completely closed and under the refill point a container can be provided to hold the graphite dust.
  • This container (which is not shown in the drawing) can be slipped in and out of the casing for emptying the graphite dust.
  • the friction member consists of a disc 9 in the form of a truncated cone, the jacket of which is designed as a friction surface and against which the tip of the refill of the refillholder inserted into the sleeve 4a rests.
  • the axis of the friction disc 9 is connected via a pinion 9a to a gear wheel I2 on whose axis a pinion I 2a is mounted which meshes with the toothed sector lea of a pivoted lever I!) having a spring H connected thereto.
  • the friction disc 9 On operating thumb lever It), the friction disc 9 is turned and, via the pinion and the sleeve do, also the refillholder 5 and the refill.
  • the thumb lever 19 After each movement the thumb lever 19 is returned to its initial position by the tension spring H. Due to the arrangement of an intermediate gear wheel I? the sleeve 4a with the refill-holder 5 and the refill on the one hand, and the friction disc 9 on the other hand, are driven in opposite directions, so that with one or two operations of the thumb lever H] a sharp refill-tip is obtained.
  • Apparatus for sharpening pencil-refills comprising a casing, a substantially vertical hollow sleeve in said casing, said sleeve constituting a holder for a pencil refill, said refill-holder being loosely inserted in said sleeve and a small inter.- mediate space being formed between said refillholder and said sleeve, a screw inserted in a side of said sleeve and passing therethrough, said screw loosely coacting with said refill-holder to prevent relative rotation between said sleeve and said refill-holder and allow free longitudinal movement of said refill-holder, said sleeve being rotatable, a pinion on the lower end of said sleeve, a slidable rack member in contact with said pinion, drive means for said rack, a friction member comprising a file rigidly connected with said rack for movement therewith, said rack and said friction member being on different sides of the axis of said refill-holder, said refill resting against said file by virtue of
  • Apparatus for sharpening pencil-refills comprising a casing, a substantially vertical hollow sleeve rotatably journalled in the top of said casing and extending into said casing, said sleeve constituting a pencil refill-holder, said refill-holder being loosely inserted in said sleeve and a small intermediate space being formed between said refill-holder and said sleeve, a screw inserted in a side of said sleeve and passing therethrough, said screw loosely coacting with said refill-holder to prevent relative rotation between said sleeve and said refill-holder and allow free longitudinal movement of said refill-holder, a pinion gear fixed adjacent the lower end of said sleeve, a slide member movably mounted in said casing at substantially right angles to said sleeve, a rack connected to said slide in contact with said pinion gear, a friction member comprising a file attached to said slide and arranged in proximity to the lower end of said sleeve and at an angle there

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  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
US735317A 1944-12-29 1947-03-18 Apparatus for sharpening pencil refills Expired - Lifetime US2552402A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2552402X 1944-12-29

Publications (1)

Publication Number Publication Date
US2552402A true US2552402A (en) 1951-05-08

Family

ID=4570070

Family Applications (1)

Application Number Title Priority Date Filing Date
US735317A Expired - Lifetime US2552402A (en) 1944-12-29 1947-03-18 Apparatus for sharpening pencil refills

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US (1) US2552402A (de)
CH (1) CH247734A (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US211911A (en) * 1879-02-04 Improvement in metal-screw machines
US836094A (en) * 1906-02-02 1906-11-20 George W Cook Pencil-sharpener.
US998044A (en) * 1909-11-03 1911-07-18 Automatic Pencil Sharpener Company Pencil-holding means for pencil-sharpeners.
CH91352A (de) * 1920-10-14 1921-12-01 Johann Boehm Schärfvorrichtung für Bleistifte und dergleichen.
DE388588C (de) * 1922-12-13 1924-01-15 Joseph Davidsohn Vorrichtung zum Anspitzen der Bleiminen sog. Kuenstlerstifte
US1770062A (en) * 1928-06-12 1930-07-08 Carl H Blomgren Pencil sharpener
CH151706A (de) * 1930-11-26 1931-12-31 Brac A G Minenspitzer.
CH183672A (de) * 1935-09-24 1936-04-30 Tschechtelin Albert Vorrichtung zum Schärfen von Schneider-Kreide.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US211911A (en) * 1879-02-04 Improvement in metal-screw machines
US836094A (en) * 1906-02-02 1906-11-20 George W Cook Pencil-sharpener.
US998044A (en) * 1909-11-03 1911-07-18 Automatic Pencil Sharpener Company Pencil-holding means for pencil-sharpeners.
CH91352A (de) * 1920-10-14 1921-12-01 Johann Boehm Schärfvorrichtung für Bleistifte und dergleichen.
DE388588C (de) * 1922-12-13 1924-01-15 Joseph Davidsohn Vorrichtung zum Anspitzen der Bleiminen sog. Kuenstlerstifte
US1770062A (en) * 1928-06-12 1930-07-08 Carl H Blomgren Pencil sharpener
CH151706A (de) * 1930-11-26 1931-12-31 Brac A G Minenspitzer.
CH183672A (de) * 1935-09-24 1936-04-30 Tschechtelin Albert Vorrichtung zum Schärfen von Schneider-Kreide.

Also Published As

Publication number Publication date
CH247734A (de) 1947-03-31

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