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Publication numberUS2457217 A
Publication typeGrant
Publication dateDec 28, 1948
Filing dateJul 13, 1945
Priority dateApr 30, 1945
Publication numberUS 2457217 A, US 2457217A, US-A-2457217, US2457217 A, US2457217A
InventorsMax Ernst
Original AssigneeMax Ernst
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dual fountain pen
US 2457217 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Dec. 28, 1948. M. ERNST DUAL FOUNTAIN PEN Filed July 15, 1945 /Illll M HWI fl,

Lil M w Paiented Dec. 2.8,' 1948 orsiicizff] 15 DUAL FOUNTAIN PEN Max Ernst, Wiesendangen, Switzerland application July 13, 1945, serial No. '604,813

In Switzerland April 30, 1945 4 Claims. (Cl. 1Z0-42.10) y 1v In practically all circles, especially with writers, engineers, businessmen,"teachers and pupils `alike there exists a great need for a fountain pen adapted to carry two kinds of one of which may be red.

Attempts have already been made to manufacture such vmulti-.colourfountain pens On the principle of the .multiple propelling pencils, but all these attempts, known to the applicant, have been characterized by too .great a mechanical complexity.

The Vobject of the present invention is a `dual fountain pen distinguishedby cheapness 'andreliability. This vfountain pen vpossesses at each .end

reservoir terminating outwardly in a nibsection `and which, inwardly, is closed by a plunger coacting with a mechanism by means of which each plunger can be axially displaced within the related ink reservoir.

In the accompanying drawing there is shown for purposes of illustration one preferred embodiment of the invention.

Fig. 1 is a lateral view of the dualfountain D911,

Fig. 2 shows a fragmentary cross-sectional view taken on an enlarged scale from Fig. 3,

Fig. 3 represents a longitudinal section of the fountain pen taken on an enlarged scale on the line III-III of Fig. 1.

With reference to said annexed drawing, numeral I designates a tubular center piece or operating member provided outside with a knurling I a. Each end of the centerpiece is fitted with a screw-thread of low pitch Ib, Ic, respectively. Each of these threads enters an. ink reservoir 2, 3, respectively, terminating in a nib-section 4 or 5. 6 and 'I denote the two pertinent usual ink feeders threaded into the ends of the ink reservoirs 2, 3, numerals 8 and 9 designating the two protective caps screwed onto the ends of the ink reservoirs 2, 3.

On the inside the two ink reservoirs 2, 3 are each closed by an axially slid-able plunger Il), I`I, respectively, seated on spindles I2, I3, spindle I2 being hollow and provided inside With a screw-thread I2a of high pitch, while the solid spindle I3 carries an external thread I3a likewise of high pitch.

As apparent especially from Fig. 2, the centerpiece I is integral with the cylinder I4 arranged therein. Internally andv externally this cylinder is provided with screw-threads Illa, I4b, respectively, of high pitch, which threads correspond with those I'2a and I3a of the spindles I2 and I3 fitted to the hollow cylinder I4.

intellectual professional Theinanipulation `and operation of Ithe aore.- described'dualv fountain pen is as follows'. `lrli Figs."2and 3 'the two 'plungers FI), l fare inthe inner position. Suppose now Athereservoir -3 is empty and has to be lled with ink, then the-.cap 9 is `iirst unscrewed and the pen i5 dipped fas usual into `an inkwell. The lower part 'of the reservoir 3 is now held rmly by the one hand, :and by the other hand the vcenterpiece I-seen 'fromfthe 'nib E--is turned clockwise. Thereby the hollow cylinder I4` is turned'together with 'the upper :reservoir 2 round about `the spindle I3, and since Vthe latter is prevented irom being carried "therewith due to friction between plunger I-I andinner wall of reservoir l3, the vspindle I3 togetherv with plunger I'l becomes axially displaced in the ldirection of the arrow A indicatedin Fig. 2 until the plunger II eventually abuts on the lower end 3a of reservoir 3. By turning the centerpiece I it is simultaneously screwed out of the reservoir 3 the axial distance L. The thread I c being, however, longer than the length of the threaded portion around which the centerpiece is screwed out of the reservoir 3, the connection between these two parts is maintained in any position.

As soon as the plunger Il abuts on the lower end 3a of reservoir 3, the centerpiece I is turned in the opposite direction, whereby spindle I3 and plunger I'I are raised, that is, moved in a direction opposite to that indicated by the arrow A and ink is drawn into the reservoir 3. The process is similar when the other reservoir 2 is to be lled; namely, the structure 2 is prevented from rotating while the actuating means I is moved clockwise or unscrewed in order to axially extend the plunger I0 and its operating rod I2, such rotation of I being in the same direction as that previously employed above to withdraw the opposite plunger II when the pen was inverted. When the plunger I0 has travelled outward the length of the reservoir 2, it is retracted by reverse rotation of the centerpiece I, thus causing ink to be sucked into the reservoir. It is thus seen that, whichever reservoir 2 or 3 is being filled or emptied, the centerpiece I is unscrewed or screwed into one reservoir the axial distance L while the corresponding plunger moves in the opposite direction the much greater length of the reservoir, these axial movements being proportionate to the different pitches of threads Ic and I3a or of Ib and Illa as the case may be.

When the plunger I0 or Il returns to the position shown in Figs. 2 and 3, the centerpiece I too is at the same time again firmly threaded into the reservoir 2 or 3. Since the hollow cylinder I 4 adapted to the centerpiece is not hollow throughout, but closed at one end, plunger packings I5 and IB prevent ink from flowing from one reservoir into the other. In order to prevent leakage, even in regions of rarefled air, say, in the mountains, especially with the barrel held downwards, the protective caps 8, 9 t snugly with a shoulder 8a and 9a, to outer front rims 2bgand'3b so as to render the barrel fluid tight. i

Alternatively, the object of the invention may likewise be utilized as writing instrument with two different nibs, one soft and one hard. i Thus, for instance, a standard writing pen may be set in at the one end, while the other end of .the

holder carries a special signature pen.

Instead of providing the centerpiece with ends threadedly engaging the reservoir 2 and 3, it might also be possible to have each of the reservoirs rotatably arrangedon a stud of the centerpiece. T o secure the position in `axial direction these studs could be .designed with an annular groove ,snugly engaged bythe related reservoir. fr, WhatI claim is: v u In a dualfountain pen having van ink reserypindisposed at each end thereof, and a plunger operatively mounted in each reservoir, the improyement comprising: an inwardly extending, threaded spindle connected to each plunger; and an operating ymember rotatable with respect to said dual fountain pen and threadedly connected to each spindle, whereby rotation of said member servesselectivelyto effect axial reciprocal move nient of either plunger.

2.Theimprovement of the preceding claim wherein,one'of said spindles is internally threaded and the other is externally threaded at their respective portions which are in threaded registration with said operating member.

3. The improvement of the preceding claim wherein said operating member comprises a hollow cylinder threaded both internally and externally and disposed with its inner and outer faces in threaded registration with the respective spindles.

4. The improvement of claim 1 wherein said operating member is connected to said dual fountain pen by threads of lesser pitch than those of each spindle whereby upon manipulation, said member moves axially opposite to and a lesser .distance than the axial movement of the particu- MAX ERNST.

REFERENCES CITED The following references are of record in the rilev of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country Date Great Britain 1929 Great Britain 1939 France 1923 Germany 1937 Number Number

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2513201 *Oct 26, 1948Jun 27, 1950Karl Reddemann WernerTwin fountain pens
US6758619 *Mar 3, 2003Jul 6, 2004Chiung-Miao YehSpinning liquid delivery container
USD667052 *May 29, 2009Sep 11, 2012Renart LimitedMarker pen
USD667053 *May 29, 2009Sep 11, 2012Renart LimitedMarker pen
USD760839 *Jan 29, 2015Jul 5, 2016Amos Co., Ltd.Marker pen
USD762773 *Jan 29, 2015Aug 2, 2016Amos Co., Ltd.Marker pen
USD774139 *Jun 4, 2015Dec 13, 2016Montblanc-Simplo GmbhPen
USD774140 *Jun 4, 2015Dec 13, 2016Montblanc-Simplo GmbhPen
USD782575 *Dec 28, 2015Mar 28, 2017Shanghai Lees Manufacturing Co., Ltd.Pen
U.S. Classification401/34, D19/36, 401/246, 401/172
International ClassificationB43K27/00, B43K27/08
Cooperative ClassificationB43K27/08
European ClassificationB43K27/08