US3552867A - Trigger swing protract-retract mechanism for ball point pens having different colored ink reservoirs - Google Patents

Trigger swing protract-retract mechanism for ball point pens having different colored ink reservoirs Download PDF

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Publication number
US3552867A
US3552867A US747159A US3552867DA US3552867A US 3552867 A US3552867 A US 3552867A US 747159 A US747159 A US 747159A US 3552867D A US3552867D A US 3552867DA US 3552867 A US3552867 A US 3552867A
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United States
Prior art keywords
trigger
ring
protract
different colored
ball point
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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
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US747159A
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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
    • B43K24/02—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
    • B43K24/086—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 with heart-shaped cams, balls
    • 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 a trigger swing protract-retract mechanism for ball point pens which have several different colored fluid reservoirs.
  • the trigger swing element acts on one of the several differently colored fluid reservoirs which are provided.
  • a locking body in the shape of a pendulum assists in securing the selected writing fluid reservoir in the positions of rest and use.
  • the pendulum is positively linked into the trigger thrust element and is adapted to roll freely transverse to the direction of push.
  • An essential disadvantage of ball pens of this type lies in the fact that the ball is adapted to fall and roll; freely, partly in the control track of the trigger or thrust member and partly in the transverse groove in the other part of the pen and thus can in no way be engaged on the pressure movement in any position of use particularly, if the circular notching is slanted or lies underneath. Due to gravity the ball whose inertia has been lifted remains in its initial position or even rolls backward, so that the pressure movement has often to be repeated.
  • One object of the present invention is to eliminate or alleviate these disadvantages. This is made possible with relatively low production cost in that a ring washer, preferably an open spring stirrup-washer is provided whose inwardly projecting engagement cam engages in the sunken semi-circular longitudinally notched guide of the trigger or thrust element and in that this spring stirrup-washer is mounted loosely within a transverse groove provided in the trigger side part of the ball pen to adapt the trigger for rotary movement so that there is play on all sides. Due to the engagement of the cam of the spring stirrup washer with the longitudinal notch of the trigger element, the washer always lies transversely to the direction of forward push and is not afiected by the gravity to prevent its proper function. The inertia of the protract-retract mechanism remains constant in any position of the triggers, so that, when pushed forward, repeated pressure is unnecessary to disengage the trigger.
  • a further simplification lies in that thespring stirrupwasher is coupled to the trigger element of the ball pen in such a way that the tensioned arms of the open spring stirrup-washer force the cam into light engagement with the sunkeninclined notch on the end of the trigger element.
  • the protract-retract mechanism is used for ball point pens having several reservoirs, each with differently coloured inks and each with swing selection by means of the trigger element provided with a curved notched guide and swing bearing mounted in a screw head sleeve.
  • FIG. 1 shows the trigger swing protract-retract mechanism for a ball point pen having different colored ink reservoirs
  • FIG. 2 shows the top plan view of a spring stirrup ring with the internal cam surface which is a critical element of the combination and which, in this figure, is open;
  • the construction of the trigger swing protract-retraot mechanism for ball point pens having several different colored fluid reservoirs embodies the protract-retract trigger element 47 in novel association with the open or closed spring stirrup ring, as shown per se in FIGS. 2-4.
  • the generally cylindrical trigger element 47 comprises a curved longitudinal notch 4 which has a semi-circular cross-section and a bearing portion 49 integral therewith and preferably formed in one piece therewith.
  • the head sleeve 53 which is threaded on its outside for engaging the pen outer barrel (not shown) serves to mount the trigger element 47 with the bearing portion 49 projecting axially below the bottom rim 57 of the sleeve 53.
  • the curved longitudinal notch 4 of the trigger cylindrical body portion 47' moves downwardly.
  • the pendulum 52 is fitted with ball portion 58 which fits into bearing 49.
  • the trigger body 47' moves up and down in the head sleeve 53.
  • the head sleeve 53 is provided with an inner transverse groove 54 into which a spring stirrup ring 24, as shown in FIG. 2, or 25, as shown in FIG. 3, or 28 as shown in FIG. 4, is fitted.
  • the curved notch 4 of the trigger element receives the radially inwardly projecting cam 26 or 27 of the spring stirrup ring.
  • the arms 24 or 28 help to hold the ring in place at the base.
  • a disc 56 may be engaged in the transverse groove 51 above bevel 50 and against the bottom rim 57 of the head sleeve 53.
  • FIG. 2 shows a spring stirrup ring 24 with internal cam surface 26 which has a thickened curved form such that it fits tightly into the groove 4 while the arms 24' opposite the cam surface 26 are relatively thin and serve to tension the cam 26 into tight position in the groove.
  • This form of the ring is preferred over the form shown in FIG. 3 wherein the arms are closed, so to speak, to form a continuous ring 25 with cam surface 26.
  • a trigger swing protract-retract mechanism for a ball point pen having differently colored fluid reservoirs which is mounted in a sleeve (53), threaded on its outside to engage the outer barrel of the pen, said mechanism comprising:
  • said trigger element having a curved longitudinal notch (4), a bevel (50) near the bottom enda transverse groove (51) above said bevel and a bearing portion (49) below said groove at the bottom end thereof, the notch, bearing portion, bevel and transverse groove all being integral with the generally cylindrical body of said trigger element;
  • said sleeve (53) being provided with an inner groove (54) at its base;
  • a spring stirrup ring (24) having an internal Ea-m surface for engagement with said curved longitudinal notch of said trigger element and having open arms opposite said cam surface, said ring fitting into said inner groove (54) to permit free rotation of said trigger element with the trigger in retracted position and tight engagement of said trigger element with the trigger in protracted position and with the pendulum (52) in the position for the selected reservoir there by preventing undesired release of the ink mechanism after the color has been selected through rotation and protraction of the trigger mechanism.

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  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Pens And Brushes (AREA)
US747159A 1967-07-24 1968-07-24 Trigger swing protract-retract mechanism for ball point pens having different colored ink reservoirs Expired - Lifetime US3552867A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1561834A DE1561834C3 (de) 1967-07-24 1967-07-24 Druckmechanik fur Kugelschreiber

Publications (1)

Publication Number Publication Date
US3552867A true US3552867A (en) 1971-01-05

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ID=5677638

Family Applications (1)

Application Number Title Priority Date Filing Date
US747159A Expired - Lifetime US3552867A (en) 1967-07-24 1968-07-24 Trigger swing protract-retract mechanism for ball point pens having different colored ink reservoirs

Country Status (4)

Country Link
US (1) US3552867A (enrdf_load_stackoverflow)
DE (1) DE1561834C3 (enrdf_load_stackoverflow)
FR (1) FR1584774A (enrdf_load_stackoverflow)
GB (1) GB1233423A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3632656C1 (de) * 1986-09-26 1987-06-11 Rotring Werke Riepe Kg Einrichtung zum Austausch von Gegenstaenden,insbesondere Schreibstiften

Also Published As

Publication number Publication date
DE1561834B2 (de) 1973-04-26
DE1561834A1 (de) 1970-04-02
FR1584774A (enrdf_load_stackoverflow) 1970-01-02
DE1561834C3 (de) 1973-11-08
GB1233423A (enrdf_load_stackoverflow) 1971-05-26

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