US3923404A - Pendulum support for a multi-point writing instrument - Google Patents

Pendulum support for a multi-point writing instrument Download PDF

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Publication number
US3923404A
US3923404A US442577A US44257774A US3923404A US 3923404 A US3923404 A US 3923404A US 442577 A US442577 A US 442577A US 44257774 A US44257774 A US 44257774A US 3923404 A US3923404 A US 3923404A
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United States
Prior art keywords
pendulum
presser
point
support
plunger
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Expired - Lifetime
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US442577A
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English (en)
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Karl Heinrich Heinz
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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
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units
    • B43K24/10—Mechanisms for selecting, projecting, retracting or locking writing units for selecting, projecting and locking several writing units
    • B43K24/16—Mechanisms for selecting, projecting, retracting or locking writing units for selecting, projecting and locking several writing units operated by push-buttons
    • B43K24/166—Mechanisms for selecting, projecting, retracting or locking writing units for selecting, projecting and locking several writing units operated by push-buttons selection by gravity with a pendulum or the like

Definitions

  • the said unit is a one-piece plastic member which [56] References C'ted has parts engageable with the presser, an integral UNITED STATES PATENTS spring guiding collar, and an integral resilient cage 3,225,747 12/1965 Schmidt v. 401 33 into which Said one end of the Pendulum is p- FOREIGN PATENTS 0R APPLICATIONS fmable' 1,269,539 5/1968 Germany 401/33 1 Claim, 10 Drawing Figures US Patent Dec. 2, 1975 Sheet 1 of 2 3,923,404
  • This invention concerns improvements in multi-point writing instruments of the kind wherein a pendulum rod effects selection and advance of the leads or other point carriers, one end of the pendulum rod being displaceably suspended in a pendulum control and support unit which is drivingly and lockingly engageable with a plunger-like presser, there being a retraction spring for urging said unit towards said presser.
  • the instrument includes a pendulum rod selectively adjustable to act on a plurality of point carriers, a rotatable starshaped spider which has radially outwardly extending teeth meshing, on the one hand, with teeth at the downward end of the presser and, on the other hand, with grooves formed at the inner wall of the sleeve of the instrument, and wherein the pendulum rod has a head or thickened rear end lying in a pivot bearing arranged at the downward-facing surface of the star-shaped spider, the pivot bearing being mounted with radial play and overlaid by a hat-shaped cover member which is formed with an opening for the pendulum rod and with a rim, and a return spring is supported against the rim of the hat-shaped cover member to urge it and the starshaped spider upwardly.
  • this known pendulum bearing assembly consists of two different functional parts: the star-shaped spider, which is injection-moulded from plastics; and the hat-shaped cover member for the pivot bearing of the spider. Consequently both these parts require a sep arate manufacturing process and associated apparatus.
  • the star-shaped spider which is injection-moulded from plastics
  • the hat-shaped cover member for the pivot bearing of the spider. Consequently both these parts require a sep arate manufacturing process and associated apparatus.
  • the spider with the pivot bearing a special injection die is needed, whereas for the hat-shaped cover member the process must include a special deformation step and tools to carry it out.
  • means must be provided for assembling together the functional parts of the pendulum support.
  • the aim of the present invention is to simplify the manufacture and assembly requirements of pendulum bearing assemblies for rnulti-point writing instruments and to reduce the number of functional parts.
  • a pendulum control and support device for a multi-point writing instrument of the kind defined wherein said device is a one-piece plastic member comprising a. means for engaging with the plunger-like presser,
  • a multi-point writing instrument comprising a sleeve, a plurality of point carriers projectable out of and retractable into said sleeve, a plunger-like presser, a pendulum rod for selecting a point carrier and causing it to project out of the Sleeve, one end of the pendulum rod being displaceably suspended in a pendulum control and support device and a retraction spring for urging said unit towards said presser, wherein said pendulum control and support device comprises a onepiece plastic member having:
  • said one-piece plastics member is an injection-moulded plastics member of generally cruciform shape in section.
  • each of the spiders and support are divided by slots and the halves of the pendulum support are elastically forceable apart when the pendulum head is inserted and thus the pendulum rod is mounted in the cross-spider, or in a functionally equivalent locking body so that it can be easily snapped into and out of mounted position.
  • a small and fixable mounting clearance for the pendulum head in the pendulum support can be achieved by forming the pendulum support with a partly spherical seat. In this way the need for additional tensioning of the pendulum support and for the previously required rechecking of the length of the pendulum are eliminated, since the play tolerance for the plastic, injection-moulded pendulum support can be very accurately fixed, whereby both the feed stroke and the amount that the presser projects out of the sleeve of the instrument can be shortened.
  • a further resiliently snap-fittable pendulum support can be achieved by forming the part of the pendulum support. below the cross-spider with a stepped shape whereby the pendulum head clampingly surrounds the pendulum rod and is supported oscillatably from all sides.
  • FIGS. 1 to 6 relate to the first preferred embodiment
  • FIGS. 7 to 10 relate to the second preferred embodiment.
  • FIGS. 1 to 6 relate to the first preferred embodiment
  • FIGS. 7 to 10 relate to the second preferred embodiment.
  • FIGS. 1 to 6 relate to the first preferred embodiment
  • FIGS. 7 to 10 relate to the second preferred embodiment.
  • FIGS. 1 to 6 relate to the first preferred embodiment
  • FIGS. 7 to 10 relate to the second preferred embodiment.
  • FIG. 1 shows part of a multi-point writing instrument in elevation and broken away to reveal a pendulum support according to the invention in longitudinal section;
  • FIG. 2 is an enlarged sectional view, partly in elevation of the upper part of the sleeve of the instrument shown in FIG. 1;
  • FIG. 3 is an elevation of the presser of the instrument shown in FIG. 1;
  • FIG. 4 is an elevation of a pendulum support according to the invention.
  • FIG. 5 is a view taken along the arrow in FIG. 4;
  • FIG. 6 is a view taken along the sectional plane VI-VI in FIG. 4;
  • FIG. 7 shows partly in elevation and partly in section, the upper part of the sleeve
  • FIG. 8 is an elevation of a presser
  • FIG. 9 is an elevation of the pendulum support according to the invention.
  • FIG. 10 is a longitudinal section through the second preferred embodiment of a multi-point writing instrument according to the invention.
  • a sleeve 1 has a guiding bore of two different-diameter sections 2 and 3 separated by an abutment 4.
  • the inner wall of the bore section 3 has longitudinal guiding grooves 5 which at their downward end terminate in downwardly projecting gear teeth 5 (FIGS. 1 and 2).
  • a tubular presser 6 is slidable in the bore. It has a piston or enlargement 7 with radially outwardly projecting, angularly spaced guiding ribs 8 and wedge-shaped teeth 9 at its downward end.
  • At the upper end of the presser there are axially directed recesses 10, for colour marking.
  • the upper end of the piston 7 cooperates with the abutment 4., while the ribs 8 cooperate with and engage in the grooves 5.
  • the pendulum support ill of this embodiment has a cross-shaped spider formed with an upper cylindrical part receivable in the tubular presser 6; the arms of the cross have wedge-shaped teeth 12 which project radially outwardly and which are arranged to mesh with the groove 5 of the piston 7.
  • the member 11 serves also as a locking body for locking the presser in a given angular orientation.
  • the downwardly projecting part of the cross-shaped spider is in the form of a springguiding collar 13 provided with a part-spherical seat or recess 14.
  • the spring-guiding collar 13 enters into one end of a compression spring which at that end abuts against the downward-facing undersurface of the arms of the cross.
  • the collar 13 and the seat 14 are both divided by slits l5 and are thus formed as a resilient, snap-in clamp or stirrup 16.
  • a link head or ball 17 formed integrally on one end of a pendulum rod 18 is snapped into the clamp 16 with play to allow for oscillation.
  • the parts l1, l2 and 13 are made of one piece of injection-moulded plastics material. Consequently, the play tolerance of this plastics pendulum support can be very exactly determined to correspond to the diameter of the pendulum ball head.
  • the embodiment according to FIGS. 7 to It differs from the preceding embodiment essentially in respect of the configuration of the teeth of the presser and the teeth of the locking body/pendulum support.
  • the toothed segments of the presser and of the locking body/pendulum support have a considerably smaller angular extent, yet they are functionally equivalent with the related parts of the previous embodiment.
  • the sleeve part 19 has a presser guiding bore 20 and an insertion bore 21 which has radially inwardly projecting guide ribs 22 terminating at their downward ends in bevelled teeth 22.
  • the presser 23 carries at its front respective toothed segments 24, for locking engagement with grooves 21 and with radially outwardly projecting double tooth segments 27, 28 formed on a generally crossshaped spider 26.
  • the spider 26 is provided on its downwardly facing surface with a stepped springguiding collar 29 which in turn has downwardly projecting, stepped and curved parts 36) forming a cage into which the link ball 17 of the pendulum rod 18 may be snapped in and journalled with play all around.
  • the pendulum ball 17 is divided by slits 31.
  • the invention encompasses multi-point instruments wherein the points are all pencil leads which may be of different colour and/or quality or which may all be the same; or wherein the points are ball-point pen or felt-tip pen cartridges of the same or different colours and/or quality and/or fineness; or wherein the points are a mixture of pencil leads, ballpoint pen cartridges and/or felt-tip pen cartridges.
  • a multi-point writing instrument having a sleeve, a plurality of point carriers projectable out of and retractable into said sleeve, a plunger-iike presser, and a pendulum which effects selection and advance of the point carriers, one end of the pendulum being displacably suspended in a pendulum control and support unit which is engageable with said plunger-like presser, there being a retraction spring for urging said unit towards said presser, that improvement consisting essentially of:
  • a pendulum rod for selecting a point carrier and causing it to project out the sleeve
  • a pendulum control and support device having mechanically separable half parts injection molded from a one-piece plastic member of generally cruciform shape in section in which one end of said pendulum rod is displacably suspended and said retraction spring is mountd for urging said support device towards said presser;
  • a plunger-like presser member having parts formed with grooves and radially projecting teeth segments;
  • said resilient, shaped cage having a spherically shaped seat for locking engagement with said grooves and said radially projecting teeth segments on said presser member.

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Pivots And Pivotal Connections (AREA)
US442577A 1973-08-14 1974-02-14 Pendulum support for a multi-point writing instrument Expired - Lifetime US3923404A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732341054 DE2341054A1 (de) 1973-08-14 1973-08-14 Pendellager fuer einen wechselschreibstift

Publications (1)

Publication Number Publication Date
US3923404A true US3923404A (en) 1975-12-02

Family

ID=5889703

Family Applications (1)

Application Number Title Priority Date Filing Date
US442577A Expired - Lifetime US3923404A (en) 1973-08-14 1974-02-14 Pendulum support for a multi-point writing instrument

Country Status (4)

Country Link
US (1) US3923404A (enrdf_load_stackoverflow)
DE (1) DE2341054A1 (enrdf_load_stackoverflow)
FR (1) FR2240831B3 (enrdf_load_stackoverflow)
IT (1) IT1007307B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5713680A (en) * 1994-11-10 1998-02-03 Crown Fancy Goods Co., Ltd. Combined writing tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905858A1 (de) * 1989-02-24 1990-08-30 Merz & Krell Mehrfarben-schreibgeraet

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3225747A (en) * 1962-08-08 1965-12-28 Schmidt Hans Ottmar Multicolor pen, particularly a multicolor ball point pen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3225747A (en) * 1962-08-08 1965-12-28 Schmidt Hans Ottmar Multicolor pen, particularly a multicolor ball point pen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5713680A (en) * 1994-11-10 1998-02-03 Crown Fancy Goods Co., Ltd. Combined writing tool

Also Published As

Publication number Publication date
IT1007307B (it) 1976-10-30
FR2240831B3 (enrdf_load_stackoverflow) 1976-12-10
DE2341054A1 (de) 1975-02-27
FR2240831A1 (enrdf_load_stackoverflow) 1975-03-14

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