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Publication numberUS3288115 A
Publication typeGrant
Publication date29 Nov 1966
Filing date16 Jul 1965
Priority date16 Jul 1965
Also published asDE1511387B1, DE1511387C2
Publication numberUS 3288115 A, US 3288115A, US-A-3288115, US3288115 A, US3288115A
InventorsEmil Hechtle
Original AssigneeRadiant Pen Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ball-point pen mechanism
US 3288115 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

1966 E. HECHTLE BALL-POINT PEN MECHANISM Filed July 16, 1965 INVENTOR EM/L HECHTLE BY A? Main; ATTORNEY United States Patent Ofifice 3,288,115 Patented Nov. 29, 1966 3,288,115 BALL-POINT PEN MECHANISM Emil Hechtle, Oradell, N..l'., assignor to Radiant Pen Corp., Kenilworth, NJ. Filed July 16, 1965, Ser. No. 472,449 3 Claims. (Cl. 120-4203) This invention relates to a ball-point pen mechanism and more particularly to a pen mechanism for protracting and retracting the ink cartridge therein.

A pen mechanism that has been almost universally adopted employs a push button plunger that rotates a rachet which alternately engages and is disengaged trom spaced apart teeth on the inner wall of the pen. Such a mechanism is illustrated in Patent Number 3,120,837 dated February 11, 1964.

It has been found that in assembling the various parts of the mechanism that the teeth on the rachet sometimes jam into the plunger and interfere with the rachet operation.

Accordingly, it is an object of the invention to provide a ratchet and plunger mechanism that will fit more smoothly, that can be assembled without jamming, and which operates with less wear than the present types.

Another object is to provide a ratchet which will disengage easily from the plunger despite the pressure of the retracting spring, and thus facilitate the protract-retract operation of the cartridge.

These and other objects are accomplished and new results achieved as will be apparent from the pen described in the following specification, particularly pointed out in the claims, and illustrated in the accompanying drawing in which:

FIG. 1 is a front elevation of the assembled pen;

FIG. 2 is a longitudinally sectioned view of the same, taken in the plane 22 of FIG. 1 and in the direction of the arrows;

FIG. 3 is an exploded partly sectioned view of the pen parts;

FIG. 4 is a top plan view of the ratchet; and

FIG. 5 is a diagrammatic developed view of the cap teeth and slots.

The pen illustrated comprises a cap 10, and a barrel 12, a cartridge 14, a retract spring 16, and a protractretract mechanism 18 for operating the cartridge. The pen cap and barrel may be threaded as at 20 and 22 respectively for securing the parts in position. A band 24 is sometimes used to secure better alignment between the cap and barrel. The cap is preferably provided with a clip 26 which in the pen illustrated is secured to the cap by a hollow rivet 28.

The protract-retract mechanism 18 comprises in part, a plunger 30, terminating in an exposed push button 32 at one end, projecting through the opening 34 of the cap, and in a hub 36, made hollow as at 38, to receive the stem 39 of ratchet 40.

The plunger 30 is preferably formed with eight laterally extending guides 42, which are adapted to slide in slots 44 and 44a formed on the inner wall 46 of cap 10. The slots are positioned between rails 48 and 48a terminating in tapered teeth 50 and 50a respectively. The guides 42 of plunger 30 are always positioned in the slots 44 and 44a providing a longitudinal non-rotative movement of the plunger in cap. In the form illustrated, slots 48 are less deep than slots 48a although, as shown in Patent 3,120,837, the slots may be of equal depth.

The ratchet 40 is provided with a hub 52 from which laterally extends tour guides 54 each provided with a main tapered tooth 56 on the upper face thereof to engage the tapered teeth 50 and 50a of the rails 48 and 48a on the inner surface of the cap.

The lower edge of the plunger 30 terminates in eight teeth 58, which also engage the tapered teeth 56 on the tour guides 54 of ratchet 40.

The invention is characterized by providing the upper edge of the hub 52 with an auxiliary set of eight circularly arranged tapered teeth 60, for engaging the eight teeth 58 formed on the bottom edge of the hub 36 of plunger '30.

Thus when ratchet 40 is inserted into the bore 38 of plunger 30, the tapered teeth 58 of the plunger and the tapered teeth 60 of the ratchet will engage each other and align the parts as is shown in FIG. 2 preventing the sharp edges of tapered teeth 56 from cutting into the plunger and jamming the mechanism, preventing rotation of the ratchet.

A further advantage is that the plunger and ratchet teeth 58 and 60 respectively when engaged, will readily disengage to permit movement of the ratchet with respect to the cap and plunger without the need for an individual plunger spring to separate the parts as is shown in Patent No. 3,120,837 or for manual removal of the plunger from the -ratche-t.

The design of the teeth of the plunger, ratchet and cap, causes the ratchet to rotate slightly when released from the cap, and again when the ratchet teeth engage the cap. The ratchet teeth alternately move from the protracted position on teeth 5011 into the retracted position when the ratchet teeth engage cap teeth 50 and slide into slot 44a. From either position, the plunger when again pressed, will free the ratchet from the cap, allowing the ratchet to rotate slightly until the teeth lock, and then when deposited once more on the cap to rotate slightly again until caught in the protract position or the retract position, depending on the position of the ratchet guides with respect to the cap slots.

Thus the ratchet rotates slightly when depressed by the plunger, and again on the cap teeth when the plunger is withdrawn, causing a circular movement that permits the cartridge to be alternately protracted and retracted.

The spring 16 operating on cars '66 of the cartridge, forces the cartridge continuously against the ratchet in bore 62, the bevelled seat 64 being provided in the bottom of the ratchet for facility in inserting the end of the cartridge. The stem 39 of the ratchet helps to maintain alignment thereof throughout the protract-retract operation. The bevel of seat 64 is made possible by the extra hub diameter created .by teeth 60.

It will be seen that there is now provided a full uniform 360 contact between ratchet and the plunger teeth, except when the teeth engage on their tapered sides to initiate rotation. When the circular movement ceases, the 360 contact is resumed. The added contact between the auxiliary ratchet teeth and the plunger teeth also frees the plunger from the ratchet to permit movement of the ratchet on the cap teeth, without jamming with the plunger teeth.

I have thus described my invention, but I desire it understood that it is not confined to the particular form or use shown and described, the same being merely illustrative, and that the invention maybe carried out in other ways without departing from the spirit of my invention, and therefore I claim broadly the right to employ all equivalent instrumentalities coming within the scope of the appended claims, and by means of which objects of my invention are obtained and new results accomplished since the particular embodiment herein shown and described is only one of the many that can be employed to obtain these objects and accomplish these results.

What I claim is as follows:

1. A ball point pen having a cap, a barrel, a cartridge, a spring for urging the cartridge to -a retract position, and a protract-retract mechanism comprising a plunger terminating in a set of teeth, a ratchet upon which the cartridge 3 4 is seated having a set of main teeth, and a set of teeth on 3. The "ball point pen of claim 1 in which the main the inner surface of the cap for alternately engaging and ratchet teeth are one half the number of the auxiliary turning the main teeth of the ratchet to permit entry of ratchet teeth. the main ratchet teeth into the slots and for retaining the ratchetin retract position, said ratchet further provided 5 References Cit d b th E i w1th an nwardly posltloned set of auxlhary teeth for UNITED STATES PATENTS contact with the plunger teeth when the plunger engages the ratchet. 3,120,837 2/1964 Johnson 120-42.03 2. The ball point pen of claim 1, wherein the auxiliary 3,137,276 6/1964 Welsser set of ratchet teeth extends continuously and circularly 10 around the ratchet. LAWRENCE CHARLES, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3120837 *5 May 195411 Feb 1964Mentmore Mfg Co LtdWriting instruments having a retractable writing point
US3137276 *30 Aug 195516 Jun 1964Kahn David IncProtract-retract mechanism and writing instrument including same
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3544227 *31 Oct 19681 Dec 1970Parker Pen CoWriting instrument
US3653777 *14 Feb 19684 Apr 1972Jacob Ritter Kg J FaControl mechanism
US4626118 *18 Mar 19852 Dec 1986Bellavance Roger TWriting instrument with fastening means
US4991988 *18 Apr 198912 Feb 1991Bic CorporationComponent writing instrument having retractable cartridge
US5184908 *23 Jun 19929 Feb 1993Kotobuki & Co., Ltd.Writing implement with side actuator
US6585388 *27 Nov 20011 Jul 2003Kim Jin-WoongBall pen having light emitting device
US769503122 Oct 200513 Apr 2010Southco, Inc.Slam latch with pop-up knob
US788721220 Oct 200915 Feb 2011Beifa Group Co., Ltd.Retractable lamp pen operating in alternate modes
US818216720 Oct 200922 May 2012Beifa Group Co., Ltd.Retractable lamp pen
US826224114 Feb 201111 Sep 2012Beifa Group Co., Ltd.Retractable lamp pen operating in alternate modes
US843495626 Dec 20087 May 2013Chana CabatanAdapter for writing instruments
US863227021 May 201221 Jan 2014Beifa Group Co., Ltd.Retractable lamp pen
US88336063 Jan 201216 Sep 2014Howmedica Osteonics CorporationDevice and method for mixing and applying biomaterials
US20120269565 *21 Apr 201125 Oct 2012Xerox CorporationLatching Assembly for an Ink Printhead
USRE32656 *12 Aug 198726 Apr 1988 Writing instrument with fastening means
CN101939174B26 Dec 200816 May 2012查纳卡巴坦Adapter for writing instruments
DE3705098A1 *18 Feb 198712 Nov 1987Merz & KrellPen
EP1702851A1 *6 Dec 200420 Sep 2006Yoshida Industry Co., Ltd.Nock-type slide case
WO2009082764A1 *26 Dec 20082 Jul 2009Chana CabatanAdapter for writing instruments
Classifications
U.S. Classification401/110, D19/51
International ClassificationB43K24/08, G09F23/00, B43K24/00
Cooperative ClassificationB43K24/084, G09F2023/0016
European ClassificationB43K24/08C