US2005179A - Fountain pen - Google Patents

Description

June 18, 1935.v F. B. CHAMBERLI FOUNTAIN PEN Filed May 6, 1933 Patented- June 18, 1.935

UNITED STATES PATENT' OFFICE Applicatiln al, 669,730

This invention -relates to fountain pens, and shell I6 which is threaded as at II tothe upper more particularly tdfountain pens of the soend of the barrel 5, which permits of the recalled self-lling type, which are adapted to be moval of the shell during the filling of the pen filled with ink without involving the use of sepawith ink in order to provide convenient access to rate filling appliances, and among the objects the bulb I5. The pen point 8 may be protected 5 of the invention are to simplify the construction by the employment of the removable cap section of such a pen, to eliminate the use of movable I8 which is adapted to be connected with the parts therein such as valves and the like, which barrel by means of threads I9 in order to cover are apt to stick and become out of order, and the pen point when the latter is not in use. This 10 to provide a pen which in proportion to its outcap section during the use of the pen may be posi 10 side dimensions is capable of holding a relatively tioned on the shell I6 in the customary manner. large supply of ink with each filling thereof. The tube I2 is provided within the confines of With these and other objects in view, which will the reservoir I0 and immediately adjacent to the appear as the description proceeds, the invenclosure member I4 with arestricted opening 20 of ltion consists in the novel features of construcconsiderably smaller diameter than the longitudi- 15 tion, combination of elements and arrangements nal opening in the tube I2, the axis of the openof parts hereinafter fully described and pointed ing being preferably arranged at substantially out in the appended claim. yright angles to the longitudinal axis of the tube.

In the accompanying drawing: In the filling of the reservoir In with ink, the

20 Fig. 1 is a longitudinal sectional view taken shell I6 is rst removed which enables the bulb 20 through a fountain pen formed in accordance I5 to be collapsed by finger pressure to effect with the present invention; an expulsion of air from within the bulb. The

Fig. 2 is a similar view on an enlarged scale of air thus displaced from the bulb travels downthe upper or bulb end of the pen; wardly through the tube I2, thence through the '4 Fig. 3 is a transverse sectional view on the line port II into the passage 9 and is discharged into 25 3-3 of Fig. 2; the body of inl'r in which the pen point is im- Fig. 4 is a sectional View of a modified form of mersed. Due to' the fact that the opening 20 pen. is of very restricted diameter and is disposed The pen as shown in Figs. 1 to 3 comprises a substantially at right anglesto the direction of barrel 5, the lower end of which is provided with a flow of air through the tube I2, by far the greater 30 neck or finger portion 6 of somewhat reduced proportion of air displaced from the bulb is disdiameter as compared with the main body porcharged. through the lower,endof the pen and tion of the barrel. Within the open lower end of ds not find access into the reservoir I0 through the barrel there is inserted and suitably rethe opening 20. Upon the release of the bulb tained a feed bar 1 anda pen point 8. and'its subsequent expansion, a partial v'acuum 35 The feed bar, adjacent to the pen point, is prois produced therein so thatfair pressure upon vided with a vertically extending passage 9 by the body of ink-in which the pen point is imwhich ink flow from the ink reservoir I0 of the mersed causes such ink to travel upwardly barrel to the pen point is eifected. Communicatthrough the passage 9 and thence into the reser- 40 ing with the passage 9 and formed in the feed voir III, although a substantially equivalent rise 40 bar is a laterally disposed port II, the upper end of ink takes place in the tube I2. This opera- -of which communicates with an air displacement tion may be repeated, i. e., the collapsing and tube I2 disposed axially and longitudinally within expanSOn 0f the bulb l5 until the desired amount, the barrel 5. The lower end of the tube I2 is of ink has been drawn into the reservoir, and

'45 preferably received within a socket formed in the the shell I6 may then be replaced and the Den 45 upper end of the feed bar I in registration with used in the ordinary manner. It will be noted the port II, while the upper end of the tube I2 is that thisconstruction avoids completely the use mounted in a closure member I3 formed at the of small movable members such as valves and upper end of the barrel 5 and rigidly retained in controlling means therefor and in this respect the any suitable manner in connection therewith. present invention constitutes an improvement 50 The closure member I3 includes, on its upper surupon theconstruction disclosed in my prior Patface, an upstanding boss Il, with which is conent No. 1,787,896 dated January 6, 1931, not only nected the open lower end of the collapsible bulb in the matter of simplifying the construction but I5, which may be made of rubber or other suitable in rendering the operation more positive and relimaterial. Normally, the bulb I5 isprotected by a able, since such small movable parts are apt to 55 corrode, stick, break or become out of order following some use thereof.

A slightly modified form of the invention has been disclosed in Fig. 4 wherein a collapsible bulb 2l of the accordion type is secured to the upper end of a. closure member 13a, and is arranged within a. shell 16a. The upper end of the bulb 25 is connected with a plunger 26 which ls adapted to slide in a bearing formed in connection with the upper wall of the shell I 6a. The end of the plunger which projects beyond the shell Ia is provided with an operating knob 2l, normally disposed in a removable cap piece 28 carried by the upper portion of the shell IGa. Also, in this form of the invention, instead of forming the tube |20. with an opening as indicated at 20 in the preferred form of the invention, th'e closure member" I3a is formed with a small tube 29 having its upper end terminated in a right angularly bent portion 30, arranged within the confines of the bulb 3,8( The principles of operation of this modified form of the invention are precisely, the same as that found in the preferred form, in that owing to the relatively small diameter of the tube 29 and to its right angularly bent po1' tion 30, air displaced from the bulb rapidly passes through the tube |2a instead of entering the upper portion of the ink reservoir. The

diameter of the tube 29 is sufilciently large however to vent the upper region of the ink reservoir and to allow for the gradual rise of ink in said reservoir by the repeated expansion and collapsing of the bulb without air compression. It will be understood that the several constructions herein shown and described are subject to some variation or modification without departing from the scope of the invention as the latter has been defined in the following claim..

What is claimed is:

A fountain pen comprising a barrel provided with an internal ink reservoir, a ported feed bar formed in connection with the lower end of said barrel, the ports in said feed bar establishing communication for fluid ilow between said ink reservoir and the atmosphere, a closure formed at the upper end of said ink reservoir, a' bulb carried by said closure, and a tube extending longitudinally of said barrel and establishing tluid flow between the interior of said bulb and the ports of said feed bar, said tube adjacent to said closure being. provided with a restricted, valveless opening possessing a diameter materially less than that of said tube, the axis of 2 said opening being disposed substantially at right angles to the longitudinal axis of the tube.

. FRANK B. CHAMBERLIN.

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