US2552402A - Apparatus for sharpening pencil refills - Google Patents

Apparatus for sharpening pencil refills Download PDF

Info

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
Authority
US
United States
Prior art keywords
refill
sleeve
holder
friction
sharpening
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
US735317A
Inventor
Buser Hans
Original Assignee
Buser Hans
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 CH2552402X priority Critical
Application filed by Buser Hans filed Critical Buser Hans
Application granted granted Critical
Publication of US2552402A publication Critical patent/US2552402A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L23/00Sharpeners for pencils or leads
    • B43L23/006Sharpeners for pencils or leads with rasping surfaces

Description

y 8, 1951 H. BUSER 2,552,402
APPARATUS FOR SHARPENING PENCIL REFILLS Filed March 18, 1947 FIG. I FIG. 2
"Inventor:
HANS 'BUSER,
Attorneys:
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 samedirection but at different speeds.
Further features of the invention will be apparent from the following description and the drawing setting forth preferred embodiments'of the invention.
In the-drawings: Y
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; I
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.
In the case of the first constructional embodiment shown in Figures 1 and 2, 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. On the slide 7 there is fastened a rack 3 which engages in a pinion 4 which is rigidly attached to a sleeve 4a. 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.
As the refill-holder may vary considerably in size, which fact may cause difficulty for an exact centering of the pencil-refill inasmuch as the latter can easily break off, 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.
.Due to the arrangement of the friction surface I on the opposite side of the refill from the point of pinion engagement with the rack 3, these two parts will move in opposite directions atthe common point ofcontact of the tip of the refill and the friction surface 1, whereby an effective sharpening of the refill is achieved.
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 mode of operation is apparent from Figures 1 and 2. The refill-holder together with the refill is inserted from above into the sleeve 4a and lowered until the tip of the refill rests against the friction member. The slide 1 is moved back and forth once or twice, which will effect sharpening of the refill. The refill-holder is then taken out of the sleeve 4a together with the sharpened refill.
In the case of the embodiment as in Figures 3 and 4, 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. 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. 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.
I claim:
1. 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 its own weight, said file sharpening said refill on movement thereof.
2. Apparatus as claimed in claim 1, characterized in that the rack is so arranged that the file and the refill move at the common point of contact in difierent directions.
3. Apparatus as claimed in claim 1, characterized in that the driving means consists of a slide which can be moved to and fro in the casing.
4. Apparatus as claimed in claim 1, characterized in that said sleeve serving to hold the refill-holder has at the lower end thereof in the central axis a centered bore, said bore being dimensioned in accordance with the diameter of the pencil-refill, so that said refill is guided by said bore and can be moved in said bore both in rotatory and longitudinal directions.
5. 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 thereto, said rack and said friction member being on different sides of the axis of said refill-holder, said refill inserted in said sleeve resting against said friction member under the force of Weight of said refill, said slide upon moving rotating said refill in contact with said file thereby sharpening said refill.
HANS BUSER.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 211,911 Johnston Feb. 4, 1879 836,094 Cook Nov. 20, 1906 998,044 Spengler July 18, 1911 1,770,062 Blomgren July 8, 1930 FOREIGN PATENTS Number Country Date 91,352 Switzerland Dec. 1, 1921 388,588 Germany Jan. 15, 1924 151,706 Switzerland Dec. 31, 1931 298,244 Italy July 2, 1932 183,672 Switzerland Apr. 30, 1936
US735317A 1944-12-29 1947-03-18 Apparatus for sharpening pencil refills Expired - Lifetime US2552402A (en)

Priority Applications (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

Country Status (2)

Country Link
US (1) US2552402A (en)
CH (1) CH247734A (en)

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 (en) * 1920-10-14 1921-12-01 Johann Boehm Sharpening device for pencils and the like.
DE388588C (en) * 1922-12-13 1924-01-15 Joseph Davidsohn Device for sharpening the lead, so-called artist pencils
US1770062A (en) * 1928-06-12 1930-07-08 Carl H Blomgren Pencil sharpener
CH151706A (en) * 1930-11-26 1931-12-31 Brac A G Mine sharpener.
CH183672A (en) * 1935-09-24 1936-04-30 Tschechtelin Albert Device for sharpening tailor's chalk.

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 (en) * 1920-10-14 1921-12-01 Johann Boehm Sharpening device for pencils and the like.
DE388588C (en) * 1922-12-13 1924-01-15 Joseph Davidsohn Device for sharpening the lead, so-called artist pencils
US1770062A (en) * 1928-06-12 1930-07-08 Carl H Blomgren Pencil sharpener
CH151706A (en) * 1930-11-26 1931-12-31 Brac A G Mine sharpener.
CH183672A (en) * 1935-09-24 1936-04-30 Tschechtelin Albert Device for sharpening tailor's chalk.

Also Published As

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

Similar Documents

Publication Publication Date Title
US2419384A (en) Fluid power wheel
US2552402A (en) Apparatus for sharpening pencil refills
US2079356A (en) Apparatus for erasing
GB1007544A (en) An apparatus for grinding drills
US3344693A (en) Means for automatically advancing and retracting a tool holder in a boring and facing head
US2181285A (en) Pencil sharpener
US2465442A (en) Phonograph needle sharpener
US2146288A (en) Pencil pointer or the like
US2110551A (en) Mechanical pencil
US2523382A (en) Pencil sharpener
US2569690A (en) Device for removing ink from fountain pens
US2437986A (en) Cross-feed mechanism
US2432376A (en) Lead sharpening device for mechanical pencils
SE7710320L (sv) TOOL HOLDERS AND PROCEDURES FOR ROTATING ROTATING WITH THE SAME
US864671A (en) Automatic pencil-sharpener.
US1556669A (en) Device for sharpening pencils
US1170093A (en) Pencil-sharpening machine.
US889056A (en) Pencil-sharpener.
US3115869A (en) Pencil sharpener
US2790282A (en) Tool and knife sharpener devices
US2082785A (en) Pencil sharpener
US2469952A (en) Pencil point sharpener
SU526463A1 (en) Centerless grinding method
US1456904A (en) Automatic pencil sharpener
SU544546A1 (en) The correct device for dressing the profile of the grinding wheel