US3880530A - Writing utensil - Google Patents

Writing utensil Download PDF

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Publication number
US3880530A
US3880530A US388232A US38823273A US3880530A US 3880530 A US3880530 A US 3880530A US 388232 A US388232 A US 388232A US 38823273 A US38823273 A US 38823273A US 3880530 A US3880530 A US 3880530A
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US
United States
Prior art keywords
pusher member
washer
circumferential edge
chamber
combination
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
US388232A
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English (en)
Inventor
Otto Katz
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.)
Faber Castell AG
Original Assignee
AW Faber Castell GmbH and 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 claimed from DE19722240173 external-priority patent/DE2240173C3/de
Application filed by AW Faber Castell GmbH and Co filed Critical AW Faber Castell GmbH and Co
Application granted granted Critical
Publication of US3880530A publication Critical patent/US3880530A/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

Definitions

  • a barrel is provided with an elongated inner chamber having opposite open ends. and a pusher member is slidably accommodated with axial clearance in this chamber. having a portion which extends outwardly through one of these ends. The pusher member is thus slidable toward the other open end by inward pressure upon the aforementioned portion.
  • the pusher member is formed with an axial passage which is open in direction toward the other end. and biasing means permanently opposes the sliding of the pusher member towards the other end.
  • An abutment in the chamber is located adjacent the other end forwardly of the pusher member, and at least one elastically deformable washer. configurated either analogously to a Belleville spring or analogously to a spring washer.
  • the washer has a center aperture in registry with the passage of the pusher member so that a lead or the like can be received in this passage and in this aperture and extend outwardly through the other open end of the barrel.
  • the present invention relates generally to a writing utensil, and more particularly to a mechanical pencil or ballpoint writing utensil.
  • Writing utensils of this type for instance mechanical pencils
  • the exertion of finger pressure upon a pushbutton causes the scribing member, that is either the ballpoint refill or the pencil lead, to be advanced by a certain increment.
  • the operation of the pushbutton is opposed by a spring located in the interior of the utensil.
  • an arrangement located in the barrel engages the refill or lead and advances it through the forward open end of the barrel.
  • the button When the lead is to be advanced, the button is pushed and the slotted clamp is shifted forwardly together with the clamping ring and the lead, until the clamping ring moves against the abutment whereupon the clamp opens due to the pressure exerted by the ring; the now opened clamp can return to its starting position when the pressure on the button is released. During this return to starting position the lead is retained in thev advanced position to which it has moved, by the elastic element until such time as the clamp has returned to its starting position and has closed to re-engage the lead.
  • Another object of the invention is to provide such an improved writing utensil which can be produced of inexpensive materials and are therefore manufactured and sold at low cost.
  • a concomitant object of the invention is to provide such an improved writing utensil which can be manufactured very economically, and can in fact be assembled by resorting to automation techniques.
  • Another important object of the invention is to provide such an improved writing utensil having a simplified arrangement for engaging the scribing member, that is the lead or the refill, which is less expensive to produce and to install than what is known from the prior art but which, at the same time, has an efficiency which is at least equal to that known from the prior art.
  • a writing utensil in a combination comprising a barrel having an elongated inner chamber and opposite open ends.
  • a pusher member is slidably accommodated in the chamber and has a portion extending outwardly through one of these ends so that the pusher member is slidable toward the other end by inward pressure upon the aforementioned portion.
  • the pusher member has an axial passage which is open in direction toward the other end. Biasing means permanently opposes the sliding of the pusher member toward the other end.
  • An abutment is provided in the chamber, adjacent the other end and forwardly of the pusher member.
  • At least one elastically deformable washer is accommodatedin the chamber intermediate the abutment and the pusher member.
  • the washer has a side facing the pusher member and a center aperture in registry with the passage of the pusher member so that an elongated rod-shaped scribing member can be received in the passage and aperture and can extend outwardly through the other end.
  • the scribing member is engaged by the inner circumferential edge face which frictionally contacts it.
  • the deformable washer is configurated analogously to a spring washer, that is as a dished spring whose inner and outer circumferential surfaces are normally inclined to the axis of the aperture of the spring. If a higher elasticity and deformability is desired, then slots may be formed in the washer extending from the inner toward the outer circumferential edge face thereof.
  • FIG. 1 is an axial section through a writing utensil according to one embodiment of the invention
  • FIG. 2 is an plan view of one of the deformable washers used in the embodiment of FIG. 1;
  • FIG. 3 is a fragmentary axial section through a writing utensil according to a further embodiment of the invention.
  • FIG. 4 is an axial section through a further washer according to the present invention.
  • FIG. 5 is an axial section analogous to FIG. 1, but illustrating an additional embodiment of the novel writing utensil which utilizes the washer of FIG. 4;
  • FIG. 6 is a perspective view, showing a set of washers having still a different configuration in accordance with another embodiment of the invention.
  • the writing utensil in FIGS. 1 and 2 has a barrel 1 provided at one of its ends (the front end) with an opening 2 through which the lead 17 can extend to the exterior.
  • the interior of the barrel is formed as an elongated inner chamber 3 of cylindrical configuration, and inwardly adjacent the front end there is formed an abutment shoulder 4 and ribs 5 which support the lead 17.
  • the opposite end of the barrel 1, that is the righthand end in FIG. 1, is closed by a cap 6 which is provided with a guide opening 7 and with an inner annular rib 8 which can be inserted with a snap action into an outer circumferential groove 9 formed on the outer surface of the barrel 1.
  • scribing-member engaging means is provided and is generally identified with reference numeral 10.
  • This engaging means utilizes one or more (here several, which are arranged in form of two axially spaced stacks) elastically deformable washers 11 which in this embodiment are configurated as dished springs having a center aperture 12 which is bounded by an inner circumferential surface 14a.
  • the washer 11 also has an outer circumferential surface 14, and is provided with slots 13 which extend from the inner circumferential surface 14a towards the outer circumferential surface 14. The provision of the slots 13 facilitates elastic deformation of the respective washer 11.
  • FIG. 3 which illustrates a different embodiment but wherein the configuration of the washers 11 is the same as in FIGS. 1 and 2, will show that in the normal dished configuration of the washers or springs 11 the inner circumferential surfaces 14a and the outer circumferential surfaces 14 of the respective springs l1all of which surfaces are annularare inclined to the center axis of the respective aperture 12, and hence of the lead 17.
  • a helical expansion spring 15 is located between the two packets or stacks of springs 11 in FIG. 1, and a pusher member 18 is provided having a portion 20 which extends out of the barrel 1 through the opening 7 in the cap 6, and which can be engaged by the fingers of a user to act as a pushbutton.
  • the lead 17 is received in a central passage 19 formed in the pusher member 18, being supported in this passage as well as in the opening 2, by the ribs 5 and in the apertures 12 of the respective springs 11. Thus, the lead 17 is supported and guided over almost its entire length.
  • the lead 17 can be advanced out of the opening 2 by an incremental distance which is determined by the length of the pusher member 18 and the length of a spacer sleeve 16 which surrounds the lead 17 intermediate the packages of springs 11 and within the confines of the helical expansion spring 15. It will be appreciated that when the pusher member 18 is moved towards the left in FIG. 1, the packages of springs 11 move in the same direction because they engage the lead 17, as well as the pusher member 18, until the rearward package of springs 11, that is the one farthest from the opening 2, abuts against the spacer sleeve 16. This makes it possible to select any desired incremental advancement for the lead 17 within the maximum advancement which is possible, whereupon the portion 20 is released so that the pusher member 18 can return to its starting position.
  • FIG. 3 I have shown a construction wherein like reference numerals identify like components as in FIGS. 1 and 2.
  • an additional spacer sleeve 21 which is also located between the packages of springs 11 but which surrounds the expansion spring 15. It cooperates with an abutment portion 22 of the pusher member 18.
  • FIGS. 4 and 5 A further embodiment of the invention is shown in FIGS. 4 and 5, FIG. 4 showing a novel elastically deformable washer and FIG. 5 showing a writing utensil utilizing this washer.
  • the washer shown in FIG. 4 is identified with reference numeral 25 and has a dished body 26 provided with a central aperture 27 from which slots 28 extend outwardly.
  • the body 27 In the region of the outer circumferential edge face the body 27 is provided with an outer annular collar 29 which extends towards the right in FIG. 4, and which in the installed condition of the washer 25 will face towards the pusher member 46, as is clear in FIG. 5. Cutouts 30 are formed in the collar 29, being circumferentially distributed therein.
  • the writing utensil in FIG. 5 has the barrel 40 which accommodates the aforementioned lead 41.
  • the cylindrical chamber in the barrel 40 is identified with reference numeral 42 and again accommodates in the region of the outlet opening 51 a plurality of supporting ribs 43 for the lead 41.
  • a cap 44 is provided, corresponding to the cap 6 of FIG. 1.
  • the clamping means is here identified with reference numeral 45 and is composed of a plurality of the washers 25 shown in FIG. 4.
  • a pusher member 46 has a portion 47 extending out of the opening provided in the cap 44 and serving as a pushbutton.
  • the pusher member 46 has an axial passage 48 in which the lead 41 is received. Unlike the pusher member 18 of FIG. 1, the pusher mem- 'ber 46 of FIG.
  • the writing utensil can accommodate a lead 48 having the same length, or of course several sections of lead which together have this length.
  • the lead is again well supported in the opening 41, by the ribs 43, the apertures 27 of the several springs 25, and the bore or passage 48.
  • a particularity in the operation of the embodiment in FIG. 5 is that here, as in the case of FIG. 3, the clamping effect of the springs 25 can be reliably negated by exerting increased pressure upon the portion 47 after the lead 41 has been advanced to the desired extent. After the advancement has terminated, and the springs 25 are in engagement, a further increased pressure upon the pressure 47 causes the force of the spring 50 to be overcome, so that the pusher member 46 shifts forwardly relative to and within the sleeve 49, until it engages the springs 25 and deflects the same into the position of greater conicity which has been described above with respect to FIG. 3. This force is transmitted from one of the springs 24 to the next via the respective collar 31.
  • the provision of the slots 28 facilitates this deflection, that is the conversion of the respective springs 25 to more conical condition.
  • the lead 41 can be freely shifted because it is no longer engaged by the springs 25, and if for instance it has moved too far out of the opening 51 it can be pushed back in to the desired extent.
  • the portion 47 is subsequently released the springs 25 will re-engage the lead 41.
  • the engaging means 35 in form of washers having essentially the configuration of a spring lock washer.
  • These lock washers are well known in the art, albeit in a different context, and reference is made to them only to particularly designate the configuration of the respective washers or springs 38.
  • These again have a center aperture 36 and are provided with slots 37.
  • the present invention makes it possible to construct the barrel of the writing utensil in a very simple shape, and to insert both the respective springs and the associated pusher element in a very simple manner into the barrel before the respective cap is applied.
  • This cap can be applied by a snapaction coupling, and no screw-threaded connection is required at all. Because of this the assembly can be carried out very readily and fully automated, if desired.
  • the various components can be produced most inexpensively and their number is reduced to a minimum.
  • the various springs can be produced of synthetic plastic material or of metal, for instance steel, and particularly if steel is used very high forces can be obtained which hold the lead steady against the force exerted upon it tip during writing with the utensil.
  • the present invention makes it possible to advance the lead to a desired extent, rather to an invariable extent.
  • the extent of advancement can be interrupted at any time within the full stroke, that is the lead can be advanced for instance by a quarter of a distance, by half the distance or the like of the total distance to which it can be advanced during a single depression of the respective pushbutton.
  • this can be done without having the lead return to its starting position (i.e., having it become retracted again) when the pushbutton is subsequently released, as is the case in the prior-art constructions where the lead will stay in the advanced position only if it has been advanced to the maximum extent possible during a single depressing of the pushbutton.
  • a combination comprising a barrel having an elongated inner chamber and opposite open ends; a pusher member slidably accommodated with axial clearance in said chamber and having a portion extending outwardly through one of said ends, so that the pusher member is slidable toward the other end by inward pressure upon said portion, said pusher member having an axial passage which is open in direction toward said other end; biasing means permanently opposing the sliding of said pusher member toward said other end; an abutment in said chamber adjacent said other end and forwardly of said pusher member; and at least one elastically deformable dished spring washer accommodated in said chamber intermediate said abutment and said pusher member, said washer having a side facing said pusher member, an outer circumferential edge face, a center aperture in registry with said passage and bounded by an inner circumferential edge face both of said edge faces being normally inclined to the axis of said aperture, so that an elongated rodshaped scribing member can be received in
  • said biasing means being a helical spring; and further comprising a spacer sleeve slidably accommodated in said chamber between said washer and said helical spring, said spacer sleeve having a center opening in axial alignment with said aperture.
  • said biasing means is a helical expansion spring surrounding said pusher member intermediate said portion and said washer; and further comprising a sleeve slidably surrounding said pusher member intermediate and bearing with its opposite ends upon said washer and said helical expansion spring.
  • said washer being deformable from less conical into more conical condition in response to application of axial stress; and wherein the diameter of said aperture bounded by said inner circumferential edge face is substantially equal to the outer diameter of the scribing member when said washer is in said less conical condition, and is greater than said outer diameter when said washer is in said more conical condition.

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  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
US388232A 1972-08-16 1973-08-14 Writing utensil Expired - Lifetime US3880530A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722240173 DE2240173C3 (de) 1972-08-16 Füllbleistift mit Vorschubmechanik

Publications (1)

Publication Number Publication Date
US3880530A true US3880530A (en) 1975-04-29

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US388232A Expired - Lifetime US3880530A (en) 1972-08-16 1973-08-14 Writing utensil

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US (1) US3880530A (US07902200-20110308-C00004.png)
JP (1) JPS49125124A (US07902200-20110308-C00004.png)
FR (1) FR2196253B3 (US07902200-20110308-C00004.png)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171170A (en) * 1977-03-31 1979-10-16 Kotobuki & Co., Ltd. Automatic pencil
US4180339A (en) * 1977-06-29 1979-12-25 A. W. Faber-Castell Mechanical pencil with automatic lead feed
US4459057A (en) * 1981-06-12 1984-07-10 Pentel Kabushiki Kaisha Mechanical pencil with automatic lead advance
WO1991017694A1 (en) * 1990-05-22 1991-11-28 The Gillette Company Mechanical pencil
FR2816885A1 (fr) * 2000-11-22 2002-05-24 Eugene Heno Protege mine a mine reglable pour mines fragiles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60178183U (ja) * 1985-03-29 1985-11-26 パイロツトプレシジヨン株式会社 ノツク式シヤ−プペンシル

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2358091A (en) * 1944-01-22 1944-09-12 Moore Pen Company Mechanical pencil
US2486663A (en) * 1946-03-01 1949-11-01 Moore Pen Company Barrel collet for mechanical pencils

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2358091A (en) * 1944-01-22 1944-09-12 Moore Pen Company Mechanical pencil
US2486663A (en) * 1946-03-01 1949-11-01 Moore Pen Company Barrel collet for mechanical pencils

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171170A (en) * 1977-03-31 1979-10-16 Kotobuki & Co., Ltd. Automatic pencil
US4180339A (en) * 1977-06-29 1979-12-25 A. W. Faber-Castell Mechanical pencil with automatic lead feed
US4459057A (en) * 1981-06-12 1984-07-10 Pentel Kabushiki Kaisha Mechanical pencil with automatic lead advance
WO1991017694A1 (en) * 1990-05-22 1991-11-28 The Gillette Company Mechanical pencil
FR2816885A1 (fr) * 2000-11-22 2002-05-24 Eugene Heno Protege mine a mine reglable pour mines fragiles

Also Published As

Publication number Publication date
FR2196253A1 (US07902200-20110308-C00004.png) 1974-03-15
JPS49125124A (US07902200-20110308-C00004.png) 1974-11-29
DE2240173A1 (de) 1974-03-07
DE2240173B2 (de) 1975-12-04
FR2196253B3 (US07902200-20110308-C00004.png) 1976-07-30

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