US3771882A - Disposable mechanical pencil assembly - Google Patents

Disposable mechanical pencil assembly Download PDF

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Publication number
US3771882A
US3771882A US00257357A US3771882DA US3771882A US 3771882 A US3771882 A US 3771882A US 00257357 A US00257357 A US 00257357A US 3771882D A US3771882D A US 3771882DA US 3771882 A US3771882 A US 3771882A
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US
United States
Prior art keywords
tube
barrel
lead
carrier
accordance
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
US00257357A
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English (en)
Inventor
M Kapilow
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Individual
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Individual
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Filing date
Publication date
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Publication of US3771882A publication Critical patent/US3771882A/en
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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
    • B43K21/06—Writing-core feeding mechanisms with the writing-cores fed by means sliding in longitudinally-slotted casings

Definitions

  • ABSTRACT A disposable mechanical pencil includes a tubular barrel having a forward tapered end through which the lead is adapted to project/A tube which receives this lead is disposed interiorly of the barrel in concentric relation therewith. Outwardly flared arms on this tube cooperate in centering the tube within the barrel.
  • a carrier acts to shift the lead forwardly out of the barrel and includes a laterally projecting finger graspable handle for such purpose. The handle is adapted to move through aligned slots in both the barrel and the tube and also serves as an indicator for the amount of lead remaining within the tube.
  • the barrel includes a radially inwardly projecting lip at the tapered forward end for engaging the lead and preventing it from falling out of the tube.
  • the carrier is provided with resistance means in the form of alternate bends which engage the interior surfaces of the tube thereby preventing the lead from being pushed back into the tube under normal writing pressure.
  • a principal object of this invention is to adapt the advantages of both the conventional wooden pencil and the non-disposable mechanical pencil and provide a disposable mechanical pencil.
  • Another object is to provide a pencil of the foregoing type with means associated therewith for indicating the amount of lead remaining in the pencil.
  • a further object is to provide a pencil of the foregoing type employing only three parts excluding the lead and erasure.
  • Still another object is to provide a pencil of the foregoing type which incorporates effective, inexpensive carrier means for generating sufficient resistance to prevent the lead from being pushed back into the pencil under normal writing pressure while permitting its retraction when such pressures are exceeded or when the pencil is not in use.
  • a still further object is to provide a pencil of the foregoing type in which almost all of the lead is adapted to be consumed.
  • An important object is to provide a pencil of the foregoing type with means for providing sufficient frictional force to keep the lead from falling out of the pencil thereby facilitating the use of lead that may be broken along its length.
  • FIG. 1 is an elevational view of a mechanical pencil assembly in accordance with the present invention
  • FIG. 2 is an enlarged fragmentary longitudinal sectional view taken along line 2-2 of FIG. 1 showing the interior and operating mechanism of the assembly;
  • FIG. 3 is a fragmentary longitudinal sectional view taken along line 3-3 of FIG. 2;
  • FIG. 4 is a further enlarged cross-sectional view taken along 4-4 of FIG. 3; 7
  • FIG. 5 is an enlarged fragmentary section view of the forward tip of the pencil barrel.
  • FIG. 6 is a cross-sectional view taken along line 66 of FIG. 2;
  • FIG. 9 is a cross-sectional view taken long line 9-9 of FIG. 8.
  • the illustrated mechanical pencil assembly 10 includes an outer barrel or shell 12 having a rear open end 14 defined also by raised projection 15 and a tapered forward end 16 terminating in the reduced opening 18 which is of uniform diameter slightly larger than the employed lead to prevent the lead from wobbling when most of the lead has already been consumed. In this connection only line contact of the lead at the forward end could under these circumstances result in lead wobbling.
  • the barrel may be fabricated of low cost material and in a successful application of the invention, it has been molded of polystyrene.
  • a conventional eraser 20 may be disposed in the rear open end 14.
  • the forward reduced opening 18 includes a radially inwardly extending lip 22 which frictionally engages the lead 24 of the pencil assembly to prevent the lead from unintentionally falling out; and in effect renders the pencil drop proof in that should the lead break the pencil remains operational.
  • the reduced tapered end 16 of the pencil includes three equally spaced recesses 26 formed from the male die of the mold which is provided with corresponding outwardly projecting ribs. These ribs mate with surfaces of the female die to take weight off the tip of the male die. In this manner, damage or breaking of the male die is significantly reduced.
  • the barrel 12 is also provided with a longitudinally extending slot 28, the purpose of which will be discussed in detail shortly. This slot 28 extends into aligned recess 29 in raised projection 15.
  • the lead 24 is supported interiorly of the barrel 12 by tube 30.
  • This tube 30 is provided with a longitudinally extending slot 32 aligned with slot 28 in the barrel 12.
  • the forward end 34 of the tube 30 is centered to properly align the lead 24 in the'opening 18 by the inner surface 36.
  • the back end of the tube 30 is centered interiorly of the barrel 12 by a pair of bifurcated or laterally projecting arms 38.
  • the tube 30 was formed of metal and consequently the arms 38 possessed a sufficient degree of flexiblity and resiliency to facilitate its mounting within the interior of the barrel 12 and maintenance of the tube 30 coaxially in relation thereto.
  • the arms provide four corners of contact which bite" into interior walls of barrel 12 to prevent the tube 30 from being retracted.
  • a carrier 40 is employed to push the lead 24 out through the opening 18 for writing purposes.
  • carrier 40 includes a forward end 42 in engagement with the rear end of the lead 24.
  • the carrier 40 which may be metal also includes a portion 44 having alternate bends, the apices of which engage with the internal surfaces of the tube 30 in providing sufficient frictional resistance to prevent the lead from being pushed back into the tube 30 through the opening 18 under ordinary writing pressure which may range from 0.250 1.250 lbs. of force. In the event normal writing pressure is exceeded and to minimize breakage of the lead tip the frictional resistance of the carrier is overcome and the lead will retract with the carrier.
  • the rear end of the carrier 40 includes an arm or handle 46 which projects laterally through the slot 32 of the tube 30 and the slot 28 of the barrel 12.
  • This handle may be grasped or engaged by a finger to urge the carrier 40 forwardly and consequently the lead 24 out through the opening 18.
  • theposition of the handle 46 is also an indication of the amount of lead present in the tube 30.
  • the forward carrier portion 44 is sufficiently long to not only permit this substantially complete consumation of the lead but to enable the forward end of slot 28 and to be moved rearwardly so that it will not be in the zone of the barrel 12 that is ordinarily grasped by the fingers when writing.
  • the handle 46 will not be in this zone when the lead is nearly all consumed.
  • the rear of the barrel 12 also includes a pocket clip 48 which is most advantageously molded integrally on the barrel 12.
  • clip 48 does not include any undercuts and possesses a configuration predominantly of straight lines. As a result, a cam operated split mold is not necessary for molding and consequently a parting line is not present.
  • the invention also contemplates cooperating structure which permits self aligning of the assembled tube 30 and carrier 40 in the barrel 12.
  • the assembled tube 30 and carrier 40 are inserted into the open rear end 14 as shown in FIGS. 8 and 9.
  • the outer terminal end of handle 46 rides in the recess 29 and upon further insertion eventually passes into and projects out of aligned slot 28.
  • the distance x from the end of handle 46 to the distal side of tube 30 is approximately equal to or very slightly less than the sum of internal diameter of the barrel l2 and depth of slot 29.
  • the lead 24 is consumed and the handle 46 is urged forwardly to expose more lead.
  • the user need only retract carrier 40 and then push lead 24 back into barrel 12 when the pencil is not used or when carried in a pocket. This preserves the lead tip and prevents it from being accidentally broken. Also, the inside of the pocket will not be marked or damaged by the exposed lead tip.
  • the lead 24 is fully expended, the user need only discard the entire assembly 10 because of this relatively low cost and need only acquire another pencil with a full length of lead 24.
  • a disposable mechanical pencil assembly comprismg:
  • a carrier slidably disposed in the tube for forcing the lead forwardly out through the forward opening of the barrel whereby all the lead in the tube can be consumed and resistance means formed by surfces of the carrier and internal surfaces of the tube for preventing retraction of the lead under ordinary writing pressure the resistance means including at least one alternate bend for frictional engagement with the associated interior faces of the tube, the carrier including a manually graspable handle projecting outwardly through the barrel and serving as an indicator of the amount of lead in the tube, and both the barrel and the tube are provided with aligned slots through which the handle is adapted to travel.
  • the reduced opening includes a substantially cylindrical portion of predetermined length for minimizing wobbling of the lead when only a relatively small part thereof is not consumed.
  • outwardly flared portion comprises a pair of arms providing four corner engagement with the interior surfaces of the barrel.
  • a pocket clip is integrally molded as part of the barrel and the clip is defined primarily by straight line construction and the entire barrel with clip is free from any parting line formed by a split mold.
  • tapered forward end includes spaced slots caused by a pin of a male mold engaging surfaces of a female mold to prevent breakage of the pin during molding.
  • a disposable mechanical pencil assembly comprising: a tubular barrel having a rear end and a tapered forward end having a reduced opening through which writing lead is adapted to project;
  • a carrier slidably disposed in the tube for forcing the lead forwardly out through the forward opening of the barrel whereby all of the lead in the tube can be consumed and resistance means formed by surfrom the tip of the handle to the distal side of the tube.

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
US00257357A 1972-05-26 1972-05-26 Disposable mechanical pencil assembly Expired - Lifetime US3771882A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25735772A 1972-05-26 1972-05-26

Publications (1)

Publication Number Publication Date
US3771882A true US3771882A (en) 1973-11-13

Family

ID=22975984

Family Applications (1)

Application Number Title Priority Date Filing Date
US00257357A Expired - Lifetime US3771882A (en) 1972-05-26 1972-05-26 Disposable mechanical pencil assembly

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US (1) US3771882A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5118851B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2326903A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2189216B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836265A (en) * 1972-05-26 1974-09-17 M Kapilow Isposable mechanical pencil assembly
US3863288A (en) * 1973-06-18 1975-02-04 Aversa And Martin Inc Cosmetic Brush Device
US3880531A (en) * 1973-05-14 1975-04-29 Marvin Kapilow Mold for writing implement barrel or the like
US4437258A (en) 1981-11-18 1984-03-20 Gilbert Allard Fishing leader holder
US4610557A (en) * 1985-02-09 1986-09-09 The Gillette Company Mechanical pencil with groove and lug structure

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE364664C (de) * 1922-12-02 Paul Druseidt Fuellbleistift
US1508171A (en) * 1923-01-26 1924-09-09 Olier Francis W D Pencil
US1891682A (en) * 1932-03-22 1932-12-20 Meyer Nicholas Pencil
US2029731A (en) * 1934-07-12 1936-02-04 Theodore H Maurer Self-feeding pencil
US2314777A (en) * 1940-08-17 1943-03-23 Farrington Hastings Macleod Mechanical pencil
US3070069A (en) * 1961-07-27 1962-12-25 Joseph L Ruden Writing implement
US3265201A (en) * 1964-02-24 1966-08-09 David L Edwards Holder and dispenser for longitudinally disposed material
CH427562A (de) * 1962-03-30 1966-12-31 Faber Castell A W Kugelschreiber mit Druckmechanik

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE645793C (de) * 1937-06-04 Alban Johnigk Schreibstift mit einem federnden, sich im Minenrohr selbsttaetig festklemmenden Vorschubstab fuer die Mine
FR396037A (fr) * 1908-10-20 1909-03-30 John Dickenson Rhoades Lamson Perfectionnements aux crayons porte-mine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE364664C (de) * 1922-12-02 Paul Druseidt Fuellbleistift
US1508171A (en) * 1923-01-26 1924-09-09 Olier Francis W D Pencil
US1891682A (en) * 1932-03-22 1932-12-20 Meyer Nicholas Pencil
US2029731A (en) * 1934-07-12 1936-02-04 Theodore H Maurer Self-feeding pencil
US2314777A (en) * 1940-08-17 1943-03-23 Farrington Hastings Macleod Mechanical pencil
US3070069A (en) * 1961-07-27 1962-12-25 Joseph L Ruden Writing implement
CH427562A (de) * 1962-03-30 1966-12-31 Faber Castell A W Kugelschreiber mit Druckmechanik
US3265201A (en) * 1964-02-24 1966-08-09 David L Edwards Holder and dispenser for longitudinally disposed material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836265A (en) * 1972-05-26 1974-09-17 M Kapilow Isposable mechanical pencil assembly
US3880531A (en) * 1973-05-14 1975-04-29 Marvin Kapilow Mold for writing implement barrel or the like
US3863288A (en) * 1973-06-18 1975-02-04 Aversa And Martin Inc Cosmetic Brush Device
US4437258A (en) 1981-11-18 1984-03-20 Gilbert Allard Fishing leader holder
US4610557A (en) * 1985-02-09 1986-09-09 The Gillette Company Mechanical pencil with groove and lug structure

Also Published As

Publication number Publication date
DE2326903A1 (de) 1973-12-13
FR2189216A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-01-25
JPS4986120A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-08-17
JPS5118851B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-06-12
FR2189216B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1977-02-11

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