US2531078A - Piston for fountain pens - Google Patents

Description

Nqv. 21, 1950 B. NILSEN PISTON FOR FOUNTAIN PENS Berni IVi/sen Filed June 17, 1948 IN V EN TOR.

Patented Nov. 21, 1950 UNITED STATES Arum] orrics PIstroN son FOUNTAIN runs Bernt Nilsen, Barranquilla, Colombia Application June 17, 194s, Serial No; 33,497

The present invention relates to certain new and useful improvements in ink-filled fountain pens and has more particular reference to a suction developing piston and convenient, manually actuable, operating means for the piston.

As the opening statement of the invention implies, many and varied types of piston structures have been devised by prior patentees and others to produce suction in a barrel and to thus suck ink, from a bottle or other container, into the storage reservoir of the barrel. The piston is arranged in most adaptations to reciprocate in or out and is operable by a rod or equivalent means to provide the desired degree of suction necessary to draw or suck ink into said reservoir. What is more, certain prior art fountain pens, in the category under advisement, utilize screw threads for imparting motion to the reciprocable piston. In carrying out the principles of the instant invention, I likewise rely on the principle of screwing the piston back and forth in the barrel in a manner to attain the desired ends with requisite certainty and efficiency.

More specifically, novelty is predicated upon an ink storing and delivering barrel, the bore of the reservoir of said barrel being screw threaded, the piston being threaded for operation in the stated screw-threaded bore and said piston being slidably keyed on a rotatable shaft whose rotation is accomplished by a thumb wheel or the like.

Other and more specific objects and advantages of the invention will become readily apparent from the following description and the accompanying illustrative drawings.

In the drawings, wherein like numerals are employed to designate like parts throughout the views:

Figure l an elevational view, on a small scale, of a complete pocket-type fountain pen constructed in accordance with the principles of the present invention;

1 Claim. (01. 12 -47)" gap l I and is internally screw-threaded to accommodate external threads on a rubber or equivalent ring-nut I 2. The ring nut is provided with a conical sleeve or bushing l3 which, in practice, serves to accommodate the cylindrical portion it of the piston rod. The upper end of the rod in Figure 2 is provided with a flange l5 which is swivelled in the nut and is further provided with a milled finger knob or grip I6 which is normally covered within the cap. The major portion of the turntable piston rod is oval in cross section as indicated at IT, and the piston, which is denoted by the numeral 18, has an oval bore which fits snugly on the rod and which permits the piston to work back and forth in an obvious manner More specifically, the piston is in the form of a sleeve which is externally screw-threaded, as at I 9, and said threads screw into the threads 9. The upper end of the piston is provided with a socketed collar portion '10 which serves to telescopically receive the bushing [3 when the collar portion is backed up against said bushing. The sleeve i3 is of the requisite degree of flexibility and tends to pack into the socket in the collar 2!} when the piston is at the extreme I upper position. Thus, a substantially fluid-type Figure 2 is an enlarged fragmentary sectional and elevatio-nal view on the line 2-2'of Figure 1, looking in the direction of the arrows; and

Figures 3, 4, 5 and 6 are cross sectional views on the lines 3--3, 4-4, 5-5 and 6-6, respectively, of Figure 2.

Referring now to the drawings by distinguishing reference numerals, the customarily shaped and proportioned barrel is denoted by the numeral 8 and this is open at opposite ends and internally screw-threaded, as at 9. One end of the barrel is fashioned into a reduced neck portion in which is externally screw-threaded to accommodate internal screw threads on a closing seal is had which will prevent the leakage of ink between the piston and piston rod.

Assuming that the reservoir of the barrel is empty, the piston rod is turned by the thumb knob and the piston is screwed or fed forwardly or downwardly into the barrel. to a desired or predetermined degree. Then, the pen 2! on the writing end of the barrel is dipped into the ink in the usual way and the piston rod is rotated in an opposite direction to develop suction in the reservoir between the pen 2i and the piston. The piston is progressively fed in the same direction until it comes into abutting contact with the bushing. The bushing telescopes into the socket of the collar 20 and when the piston is home, rotation of the piston rod is stopped. The crowding or packing of the flexible bushing into the socket in the piston provides the desired ink seal and prevents leakage of ink.

In Figure 1, I have shown a suitable pocket clip 22 and in practice an appropriate closing cap (not shown) may also be provided.

In view of the foregoing description taken in conjunction with the accompanying drawings, it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even ing an opemendedbarrel having"a-,.cylindrical bore, the wall of said bore being screw-threaded, a sleeve defining a piston, said sleeve being ex-.

ternally screw-threaded and screwed into the screw threads of said bore and operable back and? forth in the bore, the bore of said sleeve being oval in cross section, a piston feeding rod having a portion oval in cross section extending; through":

the oval bore in said sleeve, said rod being located centrally in the bore of. said barrel, a: screwthreaded bushing screwed into one end of the barrel, said: bushing: having an: axial cylin drical; passage, said rod'i passing: through; and: being I rotatable in saidipassagepthat portionaof the rod" passing through said: cylindrical passage being cylindricalrzinacross' section, a; pen" nib an'di:ink-feeding.;means;mounted" for opera! tion in the other end of said barrel, the end of said rod beyond the normal upper end of said barrel being provided with a thumb knob, said barrel terminating in an externally screw-threaded neck, and a screw cap threaded on said neck and enclosing said thumb knob, the upper end of the portion of the sleeve surrounding said rod being recessed and providing a socket, and the portion of said bushing surrounding said rod being reducedzand adaptedtto telescope into said recess, whereby to effecta liquid-tight'seal between the bushing and sleeve when latter are in positive abutting relationship.

BERNT NILSEN.

REFERENCES CITED 'Iher-followingv references are of record in the file of this patent:

UNITED STATES PATENTS Number- Name Date 1,117,469 Wisemanet al Nov. 17, 1914 1,??8332. Gaarder'et a1. Dec. 18, 1923 2,328,973 Goldfisher Sept. 7, 1943 2,329,367: Weisenberg Sept. 14, 1943

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