US1449799A - Fountain pen - Google Patents

Description

C. W. WILLIAMSON.

FOUNTAIN'PEN.

FILED FEB s 1922 Z520-9728012' Cza'rfee ZU." ffz'amson.. ttov-neyaf A 'Patented Mar. 27, 1923.

UNITED STATES y CHARLES W. WILLIAMSON',v OF NORTH GRAFTON, MASSACHUSETTS.

FOUNTAIN PEN. i

application ined February 6, 1922. serial No. 534,298.

To all whom t may concern:

Be it known that I, CHARLES l/V. WILLIAM- SON, a citizen of the United States, residing at North Grafton, in the county of Worcester and State of Massachusetts, have invented a new and useful Fountain Pen, of which the following is a specication. l

This invent-ion relates to a self-filling fountain pen.

The principal objects thereof are to provide an improved and convenient arrangement for filling the pen capable of adjustment and also having all its parts readily detachable for cleaning and repairs; and to provide an arrangement whereby the amount of ink in the pen is always visib-le so t-hat it can be known without taking the parts to pieces whether the pen needs refilling.

The invention also involves improvements in details of construction as will appear.

Reference is to be had to the accompanying drawings, in which- Fig. 1 is a longitudinal central sectional View of a fountain pen constructed in accordance with this invention; and

Fig. 2 is a similar view showing the pen in the aci; of being filled.

In the form shown, the pen comprises a casing 10 of cylindrical form and of transparent material, as for example, celluloid. It is screwed on or otherwise secured to the head 11 in which t-he pen 12 is designed to be located. As usual in such a case, the head is provided with a passage 13 extending all the way through it alon the pen for the llng ofthe reservoir an the passage of the ink. I have shown a cap 14 detachably mounted over the head and it can be located thereon in any desired way and serves the usual purpose.

At the other end of the barrel 10 a. plug 15 is screwed into it. This plug is hollow at the end toward the pen and the hollow part is screw threaded inside. Into it is screwed the end of a cylinder 17 providing an air chamber. This cylinder can be made of one or two pieces of transparent material if desired, as for example, celluloid or the like, but is shown all in one piece. It is provided with air ports 18. These are all arranged at the same distance from the end. In this cylinder there is a piston 2O having a rod 21, the piston and rod being provided with a continuous vent passage 22 extending from one end to the other all the way.

`air chamber in the Inside'the end of the cylinder 17 is a valve 23 screw threaded into a passage through to the end of the plug 15 and having. a passage for the piston rod 21. On the outer end of this valve is a wheel or knurled head 24 for turning the valve and adjusting it. The piston rod 21 extends out through the end of this head and is provided with a head 24 onits. end for manipulating it.y 1A cap 26 vis shown screwed on this end of the pen for the usual purpose'. i

In filling the pen, the valve 23 is located as near as desired to the ports 18 but so as to uncover them. Now, the piston is drawn out, the caps v14 and 26 having been removed.

This results in forcing the air out of the v cylinder 17 through the ports-.18 and through the ink chamber 27 w-hich'i-s located between the cylinders 17 and 10 and out the port 13. Now, when the bottom of the head 11 is placed in the ink as shown in Fig. 2 and the piston 20 forced in from the position shown in Fig. 2 to that shown in ig. 1, there is no way for the air to come into the inside of the cylinder 17 and fill the space previously occupied by the piston except through the ports 18. This air is necessarily supplied Yfrom the chamber 27 and the movement of the air from this chamber upwardly draws the ink up into the chamber 27 according to the well known laws of physics.

The ink is not intended to enter the ports 18 and the two chambers are designed so that their cubic contents are such as not to cause the ink to pass through thesepassages when t-he piston is moved to its limiting position. But in order to prevent the ink passing into this air chamber after the piston is brought down to its limiting position and to permit the pen to be located in any desired position, the valve 23 is now screwed in to a position to cover the ports 18 as 17 beyond the piston 2O and permitting it toperform the above mentioned functions. It will be seen, therefore, that the self-filling pen involves a very simple construction and a filling arrangement which is easily operated. There is no danger of the parts getting out of operation unless very badly misused. 'i

Although I have illustrated and described only a single form of the invention I am aware of the fact that modifications can be made therein by any erson skilled in the art without departing rom the scope of the inve-ntion as expressed in the claims. There fore, I do not wish to be limited to all the details of construction herein shown and described but what I do claim is:

l. In a self-filling fountain pen, the combination of an ink chamber with an air Chamber inside it, of a piston in the air chamber, the air chamber having ports beyond the piston for connecting it with the ink chamber to permit of the filling of the ink chamber by the movement of the piston along the air chamber t0 draw the air into the latter Chamber from the ink Chamber, and a valve for Closing said ports when the pen is iilled.

2. In a fountain pen, the combination of a barrel having an ink Chamber' therein, a Cylinder in the ink chamber having an air chamber therein, a piston in the air chamber, ports connecting the two chambers, an adjustable valve fitting in the end of the air chamber and adapted to close and open the ports, said valve being arranged to be operated from beyond the end of the barrel.

3. In a fountain pen, the combination of a barrel having an ink chamber7 an air chamber therein, a piston in the air chamber, ports connecting the two chambers, and an adjustable valve fitting` in the end of the air chamber and adapted to close and open the ports, the piston having a piston rodv eX- tending through and beyond the valve and guided'oentrally thereby, said piston rod being provided with a vent extending all the Way from one end to the other.

4e. In a fountain pen, the combination of a barrel having an inl; chamber, an air cham ber thereirnia piston in the air Chamber, ports Connecting the two chambers, an ad'- justable valve fitting in the air chamber and adapted to close and open the ports, and a plug at the end of the barrel removably connected therewith, said cylinder bei-ng detaohably mounted on the inner end ot said plug.

In testimony whereof I have hereunto at@ xed my signature.

CHARLES W. WILLIAMSON.

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