US1524284A - Fountain pen - Google Patents

Description

Jan, 27.. 1925.

E. BERGQUIST FOUNTAIN PEN Filed July 20, 1922 INVENTOR Ea/Wardergqufs,

MMA,

ATTORNEY Patented dan. 27, 1.925.v

tiainD vieu!" EDWARD BERGQUIST,

0F NEW YORK, N. Y.

FOUNTAN PEN.

Application filed July 20,

To all whom if may concern:

Be it known that T, EDWARD BERGQUIST, a subject of lsing Gustaf V of Sweden, and -a msident of the borough of Bronx, in the county of New York and State of New York, have invented certain new and useful Improvements in Fountain Pens, of which the following is a full, clear, and exact description, 'whereby anyone skilled in the art may make and use the saine.

The invention hereinafter described is directed to fountain pens and particularly to the type of pen termed in the art a. self filling pen.

Self filling pelis in the art, are not new, and generally consist of a pen barrel within which is arranged a flexing tube serving as the ink fount77 or container. Tn such devices, it is custo-mary to provide a means for collapsing the flexible tube to cause a partial vacuum within the ink fount and when the pen point and feed are immersed in the ink, and pressure is released from the collapsed tube, a suction is effected which draws the ink into the fount of the pen.

Such devices have inherent objections in that there is a boiling or surging of the ink due to its adinixture with air bubbles. A further objection results from the use of the Henible tubes which soon become impaired. A. still further objection is due to the limited capacity of the fomit as compared with the normal sized barrel or casing which has become practically standard size in pens.

With the above recit-ation of general conditions, it will be apparent, as hereinafter disclosed, that the main object of the present invention is to provide a pen having a maxiinuin fount capacity for a given barrel size; that there shall be a complete filling of the fount; that liabilit of surging and air bubbles will be obviatedy; and that the pen may be readily and completely cleansed of its charge and readily washed and cleansed.

A further object is to provide an arrangement of parts so that no erro-r may occur in the filling of the pc-n and when filled will maintain its char e Without leakage. Provision is also ma e for preventing sweating and consequent improper discharge of y from the pen.

Referring to the drawings: Figure 1 is a view in elevation with the cap cut 1n sections.

Figure 2, is a vertical sectional View showing the parts in position to receive a charge of ink.

1922. Serial No. 576,368.

Figure 8, is a similar view illustrating the parts as they are forced together to draw in the charge of ink.

Figure ll, illustrates a preferred form of leak proof joint.

Self filling pens have been heretofore designed but have had no effective means by which they could be tho-roughly cleansed and scavcnged |of any residual charge of ink. As a result, the constant taking in of new charges is contaminated with t-he old residual charge; therefore, the pen soon becomes foul and fails to operate properly.

Tt 1s one of the objects of the present device to. provide a sliding piston arrangement b y which the fount of the pen will be entirely exhausted of' its charge upon withdrawal of one of the fount members preparatory to the filling operation. This arrangement contemplates a. downward movement o f the members which will place them in position of final assembly ready for use. It is not necessary to elevate the pen point in order to prevent flooding.

In carrying out the invention in one form, as illustrated in the drawings, l provide the usual barrel 1, with its screw cap 2, which protects the pen 3, and feed 4. These parts may be of any desired form to meet requirements.

Screw threaded, or otherwise secured to the barrel l, is the tip 5, within which is supported the pen point 8, and feed 4. There is the usual feed duct 6, communicating with the ink fount to deliver ink to the pen.

The ink fount9 consists of an inner tube 7, and an outer tube 8. The inner tube 7, is secured in' any suitable manner to the tip 5, and extends into the outer tube 8, through a` stuffing box or packing 9.

This stuffing box is conveniently formed by the pressing of annular groove 10, in the wall of the outer tube 8, and inserting a suitable packing such as cork, as indicated at 11. The outer end of the tube 8, is then spun over the end of the packing as at 12. This provides a convenient form of leak proof joint between the inner tube 7, and outer tube 8.

The inner tube-7, at its upper end is provided with a piston packing 13, preferably of compressed cork, which fits snugly within the tube 8.

Just below the piston packing 13, are vent openings 14, which form a communication between the interior of the inner tube 7, and

the interior of the outer tube 8, below the to it a cap or plug 15, which, as illustrated, is

screw threaded as at 16, to engage the screw threaded opening 17, in the upper end of the barrel 1.

This screw threaded plug serves to hold -the parts to ether when the pen is filled.

Screw threa s are illustrated, although it is obvious that any form of interlocking parts ma be employed.

'lYhere is a perforation or vent 18, in the cap or plug 15, through which air above the piston 13, may be exhausted from the outer tube 8, as it is forced down to create a partial vacuum in the ink fount The operation of the device will be at once apparent on the examination of Figlires-2 and 3, of the drawings.

When the outer tube 8, is fully drawn up after releasing the screw threaded cap, the piston 13, will rest against the annular depression 10, in the lower end of the tube In this position, the opening 14, will 1 1e within the packing 9, and the fount will obviously be entirely exhausted of its charge.

Figure 2, illustrates the parts about to fully discharge by upward movement of the tube 8.

The pen point is now introduced 1nto the ink and a depression of the tube 8, causes first a parta vacuum in the tube 7, and as the former is forced down over the piston 13, a sufficient suction is induced to completely lill the tube 7, and the chamber of the tube 8, which lies below the piston pack,

ing 13. l

The tubes 7, and 8, are preferably formed of a noncorroding metal which permits the use of very thin walls and therefore leaves a maximum fount space.

Attention is particularly directed to the arrangement by which a withdrawal of the actuating tube 8, causes an exhausing of he fount chamber while a depression of the tube 8, within the barrel Icauses a filling b of the fount and leaves the parts in final osition for use with the .fount completely glled. Due to the suction eii'ect of the partial vacuum, there is no liability of leakage when the pen point is withdrawn from the ink after the filling operation.

Owing to the thinness of the walls of the telescoplng tubes, it isk feasible to provide the air chamber between the barrel 1, and the ink fount members. This air gap serves as an insulating medium for preventing sweating of the fount or expansion of its charge due to atmospheric changes from the heat of the body or hand while carrying the pen or using it. Furthermore, the use of the telescoping fount tubes permits of a light and very cheap construction as compared with any attempt to use the general y adopted hard rubber.

eiect the results attained as hereinbefore described.

Obviously, the exact details of construction, fashioning of joints and connections, etc., may be varied to suit any particular requirements.

he main purpose of the invention is specified by the use of the telescopic tubes, pistons and interconnecting openings such as has been described.

Attentionis articularly directed to the unique stuiiing box connection between the inner tube 7, and outer tube 8.

The packing 9, being of compressed cork, must, 1n order to withstand the spinning operation without distortion, be backed u by washers such as illustrated at A and Washer A, is dropped into the end of the tube 8, and rests against the shoulder formed by the annular depression 10. The cylinder of compressed cork is then inserted and a washer B, is laid over its outer end. The end of the tube 12, is then spun over the washer B. It will be apparent that without such rovision, the cork would become distorteii would not give a proper fit, and would prevent the spinning of a clean joint at the end of the tube. The features are illustrated at Figure 4, of the drawings.

It will be observed that the inner tube 7 is of comparatively large diameter, with the result that the ink reservoir formed thereby is of a capacity equal to or approximatel equal to the capacity of the space between t e two tubes 7 and 8 and between the piston 13 and the packin 9. There are practical advantages inci ent to this arrangement. I have found that when the inner tube is of small size it becomes necessary to pull out the outer tube 8 from time to time 1n order to maintain the flow of ink, or working condition of the pen, and that unless this is very carefully done such movement will cause a bleeding of the pen,

ecause a very slight movement of the outer tube causes a rap1d flow of ink through the inner tube when it is of very small size. With m arrangement, however, where the inner tu e is of'relatively large size it not only serves as a reservoir for a relatively large portion of the ink charge of the pen, but when that has been used all that is necessary in order to renew the supply of ink in the tube 7 is to invert the pen, whereupon the ink within the chamber between the exigencies of It is practically impossible to fashion hard rubber to loo the two tubes 7 and 8 will freely flow, through the openings 14, which are of fairly large size, into the inner tube 7. rlFhis action will not take place in a satisfactory manner when the inner tube is of small diameter, because, as l believe, of the capillary action of the ink upon the walls of the inner tube interfering with the free flow of ink into the small inner tube, except as it may be aided by air pressure due to relative sliding movements of the two telescoping tubes constituting the fount of the pen.

`What l claim as my invention and desire to secure by Letters Patent is:

l. In a fountain pen, a pen barrel, an ink fount arranged within the barrel, said fount consisting of a pair of telescopic tubes of dierent diameters, the inner tube communicating with the pen point, and being of a relatively large diameter whereby it serves as a reservoir for a relatively. large portion of the ink charge, a piston packing upon the inner tube, a leak proof packing between the inner and outer tubes, said inner tube having perforations below the pist0n packing providing a free communication between the interior of the inner tube and the interior of the outer tube.

2. ln a fountain pen, a pen barrel, an ink fount7 arranged within the barrel and consisting of a pair of telescoping tubes, a piston packing and a leak proof packing between the tubes, one carried by each, there being perforations through the inner tube constituting a free communication between it and the space enclosed by the outer tube between the said packings, the relative sizes of the two tubes being such that the capacity of the inner tube and the communicating chamber enclosed by the outer tube are approximately equal when the rtubes are telescoped together.

3. ln a fountain pen, a pen barrel, a removable tip and feed, an ink fount communicating with the feed, said ink fount comprising a pair of telescopic tubes, one of said tubes having a packing forming a piston, the outer tube of the fount being of less diameter than the interior diameter of the barrel, whereby the entire ink fount or reservoir is insulated by an air space from the outer barrel of the pen, openings communicating with the interior of the inner tube' and outer tube, and an air vent communicating with the outer tube.

4:. In a self-filling fountain pen, a pen barrel, tip, feed, and pen point, an ink fount arranged within the barrel comprising a sliding tube having an external diameter less than the internal diameter of the barrel, whereby an air chamber is provided between the barrel and the ink fount.

5. An ink fount for fountain pens consisting of an inner tube member and an outer tube member, a piston packing between -said members, a leak proof joint between the inner and outer tubes, said joint comprising an annular depression in the outer tube, a washer resting against the shoulder formed by said depression, a cork packing, a washer at the outer end of the packing, and an inturned flange at the end of the tube bearing against said outer washer whereby the washers support the tube wall and permit compaction of the packing.

EDWARD BERGQUIST. Witnesses:

ELsA M. BROBERG, M. JosEPmNE CRoWnLL.

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