US469499A - Benjamin k - Google Patents

Description

(MMM) B. K. DORWART.

FOUNTAIN PEN.

Patented Feb. 23, 1892.

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v UNITED STATES PATENT OEEICE.

BENJAMIN K. DORIVART, OF SOOTCl-I PLAINS, NEV JERSEY, ASSIGNOR OF ONE-HALF TO GEORGE A. COLBY, OF NEIV YORK, N. Y.

FOUNTAIN-PEN.

SPECIFICATION forming part of Letters Patent No. 469,499, dated February 23, 1892.

Application filed April '7, 1891. Serial No. 387,996. (No model.)

T all whom t may concern:

Beit known that I, BENJAMIN K. DoRwART, a citizen of the United States, residing at Scotch Plains, in the county of Union and State of New Jersey, have invented a certain new and useful Improvement in Fountain- Pens, of which the following is a specification. The improvement relates to the feeder which controls the fiow of the ink from the zo barrel, which is the general interior of the holder, down to thepen. Itis important that the ink be fed down at a sufficient rate to serve for writing, but not too fast. It is difcult with fountain-pens to insure a uniform delivery of the ink in all positions of the ink-level in the fountain or reservoir.

My invention contributes to the uniformity of delivery. I denominate as the feeder a removable piece applying in the hollowed zo surface on the inner face of the pen extending up into the reservoir or fountain. I make the feeder capacious and cause the ink to wet its periphery without filling the central space. The upper end of the feeder is flat- 2 5 tened and opened at the edges of the attened part, so that the ink obtains a restricted access to theinterior. When the fountain is full or nearly full, the head induces a pressure; but there being no induction of air, except 3o as it comes up through the feeder, the descent is slow. It is a singular fact that many or most fountain-pens, owing to the increased facility of inducting air or to some other cause, tend to deliver ink faster instead of 3 5 slower when they become nearly empty. In myimprovement there is a small annular space on the exterior of the feeder at the upper end below the iiattened portion. Thelast of the ink lies in that annular space, with no 4o access to the interior except as it is drawn up to the flattened and split portion by the attraction of the surfaces, an action akin to capillary attraction aided by the movement of the ink induced by changes of position of the pen. On arriving at the attened and split portion of the feeder and thoroughly wetting that, the ink is certain to be delivered downward on the interior at a sufficient rate to keep the surfaces wetted. This in- 5o sures a nearly uniform supply to the pen un der all conditions.

The accompanying drawings form a part of this specification and represent what I consider the best means of carrying ont the invention. I 5 5 Figure l is a longitudinal central section on the line w w in Fig. 2, and Fig. 2 is a corresponding section at right angles on the line .fr no in Fig. l. Fig. 3 is a cross-'section on the line y y in Fig. l. The remaining gures 6o show a modification. Fig. 4 is alongitudiuall section of a portion, and Fig. 5 is a cross-section on the line ,e a in Fig. 4.

Similar letters of reference indicate corresponding parts in all the figures where they appear.

A is the barrel, of hard rubber or other suitable material. The upper end is tightly closed.

B is a bottom piece secured by screw- 7o threads, as shown, Vextending both upward and downward from the lower end. Its interior may be perfectly cylindrical.

The portion which I designate the feeder, and in which the novelty resides, is marked D, certain portions being indicated, when necessary, by supernumerals, as D. A portion of its mid-length (marked simply D) is cylindrical and adapted to t tightly in the cylindrical interior of the bottom piece B. Its 8o upper end is flattened, as indicated by D', and the edges of the llattened portion are cut, so that what is in fact a thin split d obtains between the flat surfaces with an opening at the upper end, and also extending down a con- 8 5 siderable distance each side. This forms the provision for inducting the ink slowly into the hollow interior of the feeder. The lower end of the feeder has a tapering arm D2, extending downward on the under side and ap- 9o plying its slightly-hollowed upper face against the under side of the pen. The junction of this arm D2 with the body D is formed with a bend, as indicated at D3, and with an indentation on the upper side, as indicated by D4. (See Figs. l and 3.) Y

M is the pen. It should have a thin body, having a curve in cross-section coinciding with the interior of the bottom piece B. It is held by thrusting it upward on the upper face roo of the feeder.

I have in my experiment-s made the feeder of hard rubber, giving it so little thickness that it will yield inward by its elasticity, and thus allow the entrance of the pen between itself and the interior faceof the bottom piece B; but this may be varied. I can, when the exact size and thickness of the pen to -be used is determined, make the feeder with a greater thickness and stiffness and produce a permanent depression therein just sufficient to allow for the thickness of the pen. The barrel A may be filled from a droppei in the ohviousmanner after inverting it and unscrewing and removing the bottom piece B and its attached feeder. The bottom piece may be replaced again after the barrel is filled.

To adapt the pen for carrying in the pocket or otherwise the usual cap is employed, as in all fountain-pens, to covei and protect theworking end. To adapt the pen for use it is necessary simply to remove the cap and holding the entire device in the ordinary position for writing the ink Will be fed down at just about the proper rate. It is important to use a thin Writing-fluid. Ordinary copying-ink and other thick inks are liable by their drying to obstruct the passage.

In the modification shown in Figs. 4 and 5 the arm corresponding to D2 is in a separate piece from the body of the tube. Such sepa- .rate piece is extended up through the middle of the large interior of the cylindrical partD and quite u p to the flattened portion D. width of this tongue, which thus reaches up inside, should be sufficient to extend quite across and match pretty tightly against the The interior ofthe part D. Its lower end is bent upward, so as to lie against the pen. This form of the invention sei'vesvthe same as that which I esteem the preferable form, (shownin Figs. 1, 2, and 3,) except that with this form there is less space for air in the interior of the part D. Only one half, the upper half of the part D, and one face, the upper face of the tongue,which is nowa partition extending up through D, is available to lead down the thin lamina of ink. Care should be taken in this form of the device to have the opening at the edges of the attened part of the feeder eX- tend down somewhat into the neck or the portion which changes gradually from the fiattened to the cylindrical form. The ink iiows inward through the approximately-triangular aperture tlins provided on each edge of the tongue.

I claim as my invention- The fountain-pen described,having the tube A, bottom piece B, pen M, and feeder D,With itsk flattened upper end D and slit or thin space d open at the edges, as shown, and arm D2 at the lower end, adapted for feeding ink i slowly to the pen,all combi-ned and arranged for joint operation as herein specified.

In testimony that I claim the invention above set forth I affix my signature in presl ence of two witnesses.

BENJ. K. DORVA-RT.

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