US2709989A - Operating mechanism for a writing instrument - Google Patents

Operating mechanism for a writing instrument Download PDF

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Publication number
US2709989A
US2709989A US408760A US40876054A US2709989A US 2709989 A US2709989 A US 2709989A US 408760 A US408760 A US 408760A US 40876054 A US40876054 A US 40876054A US 2709989 A US2709989 A US 2709989A
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US
United States
Prior art keywords
writing
unit
plunger
spring
slidable
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
US408760A
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English (en)
Inventor
Richard J Mansheim
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.)
WA Sheaffer Pen Co
Original Assignee
WA Sheaffer Pen 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
Application filed by WA Sheaffer Pen Co filed Critical WA Sheaffer Pen Co
Priority to US408760A priority Critical patent/US2709989A/en
Priority to FR1122265D priority patent/FR1122265A/fr
Application granted granted Critical
Publication of US2709989A publication Critical patent/US2709989A/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
    • B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units
    • B43K24/02—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions
    • B43K24/08—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions operated by push-buttons

Definitions

  • This invention relates to an improved operating mechanism for a writing instrument and more particularly to an improved mechanism for alternately moving the writing unit of such an instrument between an extended writing position and a retracted position within the barrel of the instrument.
  • Still other devices heretofore known have employed a spring constructed from sheet material and having a formed portion engageable with a recess in a sliding element. This engagement maintains the writing unit in an extended position against the force of a helical spring, and a latch or sleeve is provided to effect removal of the iiat spring from the recess to permit retraction of the writing unit into the body of the instrument under the inuence of the compressed helical spring.
  • the fundamental objection to such devices has been the requirement of a controlled application of force to the push button to insure the desired alternate operation between the extended and retracted positions. A partial depression of the push button extends the unit while a full depression thereof releases the writing unit for retraction into the barrel of the instrument. if lthe push button is alternately depressed partially and fully, the writing unit will alternately extend and retract. Failure to properly depress the button will cause erratic operation.
  • a ball point type writing instrument having a barrel and a writing unit, said writing unit including a ball type writing fluid applicator, a reservoir communicating therewith, and a plunger mechanism having a manually engageable rearwardly extending free end for effecting movement of the writing unit within the barrel.
  • the plunger element has an operating mechanism associated therewith which includes a sleeve slidable on a reduced portion of the plunger and having an annular recess thereabout engageable by a flat spring means secured in the barrel of the instrument.
  • the spring means engages the recessed portion of the sleeve to maintain the writing unit in an extended writing position against the force of a retracting spring.
  • a collar is mounted on the recessed portion of the sleeve and axially slidable therealong whereby a full depression of the plunger will cause the spring means to engage the collar, thus removing said spring means from the annular recess and permitting retraction of the writing unit into the barrel of the instrument.
  • a unique means is provided by this invention whereby full motion of the plunger is prevented on alternate depressions thereof and the flat spring means can engage the collar only during the remaining alternateV depressions.
  • the means particu- ⁇ larly described in this disclosure is a furcated spring ⁇ device substantially parallel with the plungerpand secured thereto at the rearward end. lThe forward end of said spring is slightly flared and engageable with the slidable.
  • Fig l is an illustration in longitudinal section of one embodimentof this invention with the writing unit in the retracted position;
  • Fig. 2 ⁇ illustrates the embodiment of Fig. l with the writing unit in thekextended or'writing position;
  • FIG. 3 illustrates the embodiment of Fig. l with the writingunit overextended to effect retraction of the writing unit.
  • Fig. 4 illustrates the embodiment of Fig. l with the writing unit in a partially retracted position
  • Fig. 5 illustrates the embodiment of Fig. l at the beginning of an expelling or extending motion of the writing unit.
  • Fig. 6 is a transverse sectional view taken along the line 6-6 of Fig. 1;
  • Fig. 7 is a transverse sectional view taken along the j line 7--7 of Fig. 2;
  • Fig. 8 is a transverse sectional view taken along the line 8-8 of Fig. 3;
  • Fig. 9 is an exploded isometric view of all of the elements necessary for the operating mechanism of this invention.
  • a writing instrumcnt10 comprising generally a barrel 12 having a pocket clip 14 secured thereto in the customary manner and containing an axially movable writing unit 16 therein.
  • the barrel includes a forward reservoir receiver 34, a cylinder 36 containing the operating mechanism, and a cap 32, all coaxially assembled.
  • the writing unit 16 includes a reservoir 18 and an applicator or writing element such as ball dispenser 20 extending from the forward end thereof.
  • the reservoir and dispenser are continuously urged rearwardly within the barrel by a helical spring 22 compressed between an abutment 24 formed in the inner surface of the barrel 12 and the forward end of the reservoir 18.
  • a plunger 26 is mounted rearwardly of the reservoir 18 and in free abutting engagement therewith.
  • a push button 28 is secured to the rearward end of plunger 26 and extends through an axial opening 30 in the rearward end of cap 32.
  • the operating mechanism for the instrument is an integral unit contained within the cylinder 36 between the reservoir 18 and the push button 28.
  • the operating mechanism includes a plug 38 threadably engaging the cylinder 36 and having an inner diameter such that it fits closely over a furcated cylindrical spring 40 which is secured to the plunger 26.
  • the spring 40 is secured to the plunger 26 at the rearward end thereof as by staking 42 and the forward furcate portion thereof is formed to flare away slightly from the plunger 26 when unstressed.
  • a cylindrical spring element 44 is secured to the outer surface of plug 38 and is slotted to form a plurality of forwardly extending fingers 46 having forward end portions turned inwardly toward the axis of plunger 26.
  • Contained within the cylindrical spring 44 and slidably mounted on plunger 26 is a sleeve 48 having a body portion 50 and a tightly fitting retainer portion 52.
  • a recess 54 is formed between the two portions of the sleeve 48 and a small annular collar 56 is mounted in this recess and axially slidable therein.
  • the forward end of the body portion 50 is tapered to cooperate with the shaped fingers 46 of spring 44 in a manner which will be clear from the description of operation which follows.
  • Fig. 2 which illustrates the writing instrument in condition for use
  • the sleeve 48 has been forced forwardly on the plunger 26 whereby the free furcate portion 41 of the spring 40 is released and permitted to flare outwardly.
  • the fingers 46 urge the sleeve 48 rearwardly on the plunger 26 as in the first motion described above.
  • the sleeve 48 is restrained t'rom such rearward motion relative to plunger 26 by engagement with the ared free ends 41 of the cylindrical spring 40 as shown in Fig. 3.
  • the spring fingers 46 are forced out of the recess 54 in the sleeve 50 and radially extended to engage the collar 56.
  • Fig. 9 All of the essential elements of this embodiment are shown in Fig. 9 in an exploded and diagrammatic form.
  • the plunger 26 with the push button 28 fixed to one end thereof extends throughout the entire mechanism and has furcate cylindrical spring 40, plug 38, slotted spring 44, sleeve 48 and collar 56 all coaxially mounted thereon.
  • a washer 58 is staked to a reduced portion 60 at the forward end of plunger 26 to maintain the entire assembly in integral but slidable relationship.
  • the sleeve 48 and collar 56 are shown removed from the cylindrical spring 44 but that in assembly these parts are contained within the slotted portion thereof.
  • the flared fingers 41 are maintained collapsed against the plunger 26 by the plug 38 when the plunger 26 is retracted to the extreme rearward position within the barrel 12.
  • the ared fingers spread to engage the sleeve 48 and limit rearward movement thereof whereby the spring fingers 46 will engage the collar 56 permitting retraction of the writing unit.
  • the ared fingers are restrained, permitting full movement of the sleeve, and consequent engagement of fingers 46 with recess 54 preventing retraction of the writing unit.
  • this invention contemplates a device utilizing a single manually engageable means for alterlizing a recess formed in a slidable member engageable by a resilient transversely movable element fixed in the body of such a writing instrument and a means to determine the limits of motion of the slidable element and to vary these limits on alternate operations of the device whereby the desired alternate actuation of the device is insured.
  • Apparatus for alternately maintaining an elongated axially movable element in each of two predetermined positions relative to a surrounding body comprising resilient means urging said element to the'first of said positions, transversely movable resilient means in said body, axially slidable means carried by said element movable thereon between two predetermined limits and having a recessed area to receive said transversely movable resilient means to maintain said element 4in the second of said positions against the force of said resilient means, a second slidable means partially filling said recess and movable therein to engage said transverse resilient means and effect removal of said transverse resilient means from said recess, and means limiting the motion of said slidable means upon alternate movements to the second of said positions to prevent engagement of said second slidablermeans by said transverse resilient means.
  • Apparatus for alternately maintaining an elongated axially movable element in each of two predetermined positions relative to a surrounding body comprising resilient means urging said element to the first of said positions, transversely movable resilient means in said body, axially slidable means carried by said element movable thereon between two predetermined limits and having a recessed area to receive said transversely movable resilient means to maintain said element in the second of said positions against the force of said resilient means, a second slidable means partially filling said recess and movable therein to engage said transverse resilient means and effect removal of said transverse resilient means from said recess, limiting means mounted on said axially movable element and engageable with said axially slidable means to limit the motion of said slidable means, and means mounted in the body to render said limiting means ineffective upon alternate movements of said element to the second of said positions.
  • a writing instrument having a barrel portion and a writing unit therein axially movable between a forward writing position and a retracted position, means for alternately maintaining said unit in each of said positions comprising resilient means urging said unit to the retracted position, transversely movable resilient means secured in said barrel portion, slidable means carried by said unit and having a recessed area adapted to receive said resilient means when. the writing unit is in the writing position, a second slidable means partially filling said recess and movable therein to engage said transverse resilient means and effect retraction thereof from said recess, and means limiting the motion of the slidable means on alternate reciprocations of said writing unit to prevent engagement of said transverse resilient means by said second slidable means.
  • a writing instrument having a barrel portion and a writing unit therein axially movable between a forward writing position and a retracted position, means for alternately maintaining said unit in each of said positions comprising resilient means urging said unit to the retracted position, transversely movable resilient means secured in said barrel portion, slidable means carried by said unit and having a recessed area adapted to ⁇ receive said resilient means when the writing unit is in the writing position, a second slidable means partially filling said recess and movable therein to engage said transverse resilient means and effect retraction thereof from said recess, stop means limiting the motion of the slidable means to prevent engagement of said transverse resilient means by said second slidable means, and means to render said stop means ineffective on alternate reciprocations of said Writing unit.
  • a writing instrument having a barrel portion and a writing vunit therein axially movable betweenL a forward writing position and a retracted position, means:
  • a writing instrument having a barrel portion and a writing unit therein axially movable between a forward writing position and a retracted position, said unit including a fluid dispenser, reservoir, and plunger axially aligned, said plunger and said reservoir being in free abutting relationship, means for alternately maintaining said unit in each of Said positions comprising resilient means urging said unit to the retracted position, transversely movable resilient means secured in said barrel portion, slidable means carried by said plunger and having a recessed area adapted to receive said resilient means when said unit is in the writing position, a second slidable means partially filling said recess and movable therein to engage said transverse resilient means and effect retraction thereof from said recess, and means limiting the motion of the slidable means on alternate reciprocations of said writing unit to prevent engagement of said transverse resilient means by said second slidable means.
  • a writing instrument having a barrel portion and a writing unit therein axially movable between a forward writing position and a retracted position, said unit including a fluid dispenser, reservoir, and plunger axially aligned, said plunger and said reservoir being in free abutting relationship, means for alternately maintaining said unit in each of said positions comprising resilient means urging said unit to the retracted position, a furcated cylindrical spring secured in said barrel portion, a slidable sleeve carried by said plunger and having an annular recessed area adapted to receive said furcated spring when said unit is in the writing position, a slidable collar freely mounted on said sleeve and slidable in the recess to engage said furcated spring and effect retractionrthereof from said recess, and means limiting the motion of said sleeve on the plunger during alternate reciprocations of said writing unit to prevent engagement of said furcated spring by said collar.
  • a writing instrument having a barrel portion and a writing unit therein axially movable between a forward writing position and a retracted position, said unit including a fluid dispenser, reservoir, and plunger axially aligned, said plunger and said reservoir being in free abutting relationship, means for alternately maintaining said unit in each of said positions comprising resilient means urging said unit to the retracted position, a furcated cylindrical spring secured in said barrel portion, a slidable sleeve carried by said plunger and having an annular recessed area adapted to receive said furcated spring when said unit is in the writing position, a slidable collar freely mounted on said sleeve and slidable in theV recess to engage said furcated spring and effect re# traction thereof from said recess, stop means limiting the motion of said sleeve on said plunger to prevent engagement of said furcated spring by said collar, and means to render said stop means ineffective on alternate reciprocations of said writing unit.
  • a writing instrument having a barrel portion and a writing unit therein axially movable between a forward writing position and a retracted position, said unit including a fluid dispenser, reservoir, and plunger axially aligned, said plunger and said reservoir lbeing in free abutting relationship, means -for alternately maintaining said unit in each of said positions comprising'resilient means urging said unit to the retracted position, a furcated cylindrical spring secured in said barrel portion, a slidablel sleeve carried by said plunger and having an annular recessed area adapted to receive said furcated spring when said lunit is in the writing position, a slidable collar freely mounted on said sleeve and slidable in the recess to engage said furcated spring'and effect retraction thereof from said recess, stop means mounted on Asaid plunger and engageable with said sleeve to limit the motion thereof and prevent engagement of said furcated spring by said collar, and means-in said barrel to engage said barrel
  • a writing instrument having a barrel portion and a writing unit therein axially movable between a forward writing position and a retracted position, said unit including a uid dispenser, reservoir, and plunger axially aligned, said plunger and said reservoir being in free abutting relationship, means for alternately maintaining said unit' in each of said positions comprising 8 resilient means urging'said unit to the retracted position, a furcated cylindrical spring secured in said barrel portion, a slidable sleeve carried by said plunger and having an annular recessed area adaptedr to receive said furcated spring when said unit is in the writing position, a slidable collar freely mounted on 'said sleeve and slidable in the recess to engage said furcated spring and effect retraction thereof from said recess, stop means secured to said plunger and having a resilient flared portion engageable with said sleeve to limit the rearward motion thereof on said plunger and to prevent engagement of said furcated

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  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
US408760A 1954-02-08 1954-02-08 Operating mechanism for a writing instrument Expired - Lifetime US2709989A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US408760A US2709989A (en) 1954-02-08 1954-02-08 Operating mechanism for a writing instrument
FR1122265D FR1122265A (fr) 1954-02-08 1955-02-05 Perfectionnements à un mécanisme de commande pour un instrument à écrire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US408760A US2709989A (en) 1954-02-08 1954-02-08 Operating mechanism for a writing instrument

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US2709989A true US2709989A (en) 1955-06-07

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US408760A Expired - Lifetime US2709989A (en) 1954-02-08 1954-02-08 Operating mechanism for a writing instrument

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FR (1) FR1122265A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2929359A (en) * 1954-12-15 1960-03-22 Ketcham & Mcdougall Ball point pen
US8833606B2 (en) 2012-01-03 2014-09-16 Howmedica Osteonics Corporation Device and method for mixing and applying biomaterials

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH1885168A4 (fr) * 1968-12-18 1970-10-30

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491082A (en) * 1944-04-29 1949-12-13 Eversharp Inc Fountain pen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491082A (en) * 1944-04-29 1949-12-13 Eversharp Inc Fountain pen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2929359A (en) * 1954-12-15 1960-03-22 Ketcham & Mcdougall Ball point pen
US8833606B2 (en) 2012-01-03 2014-09-16 Howmedica Osteonics Corporation Device and method for mixing and applying biomaterials

Also Published As

Publication number Publication date
FR1122265A (fr) 1956-09-04

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