US1874024A - Fountain pen - Google Patents

Description

Aug. 1932- F. M. ASHLEY 1,874,024

' FOUNTAIN PEN Filed Jan. 17, 1951 1 enema Au so, was

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FRANK M. ASHLEY, 0F BROOKLYN, NEW YORK FOUNTAIN Application filed January 17, 1931. Serial No. 509,403.

My invention relates to fountain pens.

The object of my invention is to provide a self-filling fountain pen in which a piston is used to fill the pen and in which the piston and piston-rod is made hollow to serve as a part of the ink reservoir.

A further object is to provide means for increasing the length of the piston-rod comprising an extension member which extends over the rod and the outer diameter of which is very nearly as great as theouter diameter of the barrel of the pen. s

A further object is to provide a pen having a long smooth gripping surface .for the fingers and in which the thread which engages the cap, is located between the gripping surface and the rear end of the pen.

A further object is to provide a pen having a transparent or translucent section located adjacent the pen-section thru which the ink may be seen in the reservoir of the pen.

Further objects of my invention and the advantages of the construction will be hereinafter set forth, one of which is to make the reservoir of a number of short tubular sections to reduce the waste in manufacturing caused by injury to a part, such as the barrel, which when injured must, be discarded. whereas when made in short sections, only the relatively short section injured, must be discarded.

Referring to the drawing which-forms a part of this specification;

Fig. 1 is a longitudinal sectional view of a pen, shown on an enlarged scale, embodying my invention.

Fig. 2 is an exterior view of the pen.

Fig. 3 is a cross sectional view on line 3 3 of Figure 1.

Fig. 4 is a cross sectional view on line 4-4: of Figure 1.

10, indicates a portion of the barrel of the i pen, the inner cylindrical wall of which is formed smooth and is provided with a shoulder 11 which serves as an abutment for the piston 12.

A thread 13- for the cap (not shown) is formed on the end of the section 10 as illustrated;

A tubular section 14- of transparent or translucent material such as celluloid or bakelite is connected to the portion 10- by a thread 15- and a pen-section 16- is connected by a thread 17- to the section 14.--;

the outer surfaces '18- and 19-- providing 1 a relatively long smooth gripping surface for the fingers in writing.

The hollow piston 12- is provided with a hollow piston-rod 20- formed integral therewith which is threaded its entire length on its exterior surface to engage the thread 21 formed in the extension sleeve 22. T his thread is preferably fast pitch or may be a double thread of fast pitch to permit the sleeve 22- to be rapidly screwed outward from the section 10 to serve as an extension of the piston-rod. 1

The inner diameter of the sleeve 22- is enlarged as shown at 23- enough to entirely prevent thread engagement, and to provide a shoulder 24- which abuts the flange 25- which flange serves as a packing for the nut 26- which closes the rear end of the pistonrod and thus prevents dis-engagement of the rod and sleeve.

The piston is made with an annular groove 27 in which cork or other suitable packing 28- is located.

29- indicates a feed-plug having the usual feed duct 30- and is. provided with a small capillary opening 31- which leads to a tube 32 which tube extends therefrom to a redetermined point within the piston-r0 as shown. I v

The short length of the section 10 makes it a relatively easy job to provide a true smooth cylindrical surface 33- for the-piston to sllde upon, which is one of the most diflicult and important points in piston pen construction, and since the pen is made to fill by a number of short strokes of the piston, this section is made of a length to correspond to the greatest length of stroke, al-

greater number of strokes hereinafter set forth. i

The parts are assembled as follows:

though the pen may be filled by making a of less length, as

22- is screwed onto the piston-rod to the position shown, which clamps the back edge of the piston a ainst the shoulder 11 to form a valve inli-tight joint independent 01 the piston packing and serving also to vent any movement of the piston rod.

The nut 26 is then screwed into the open rear end of the piston-rod, as shown.

The section19 is then screwed firmly into the section 10 afterwhich the feed-plug with its tube connected, is adjusted in the usual manner.

Fountain pens with large reservoir capacityl are sure to drop ink from the pen-point w en the reservoir becomes nearly em ty, caused by the relatively large volume 0 an admitted above the ink in the reservoir, which expands by heat or by change of barometric pre- .1 pressure and forces the ink from the resaction above referred to without ervolr.

The present construction can be regulated to prevent this trouble: When the ink has been partly removed from the reservoir, the sleeve 22- may be screwed outwardly on the piston-rod and then by holding the pen-point upwardly the piston may be moved upwardlfy in section 10- to any degree desired, thus orcing the air from the reservoir into the outer atmosphere and reducing the, capacity of the reservoir, and this willprevent the drip altering the len t of the pen as a whole, o fill the reservoir, the front end 9f the pen-section 18 is immersed in a body of ink and the sleeve 22- is screwed outward to the hmit of its travel on the piston-rod and serves as a handle to operate the piston.

On each successive inner stroke of the piston, air trapped in the upper end of the reservoir 34- above the surfaceof the ink, will be forced outthru the tube 32%- and passages 31-- and 30, and on each successive outer stroke of the piston, ink wil be drawn directl into the reservoir thru the feed duct '30, an trapped in the reservoir, and in this manner the reservoir may be completely filled with ink.

The construction and use of the air tube in fountain pens is well known in and requires no special description. 7 p I The present construction permits the use this art 1. A fountain pen comprising a pen 'secF tion, a translucent cylindrical section connected thereto, a barrel connected to said cylindrical section, a piston in said barrel having a hollow piston-rod open at its inner end, and which extends beyond the end of the barrel, an extension sleeve connected to said piston-rod and movable relative thereto, and means comprising a flange for preventing the disengagement of the sleeve and rod.

2. A fountain pen comprising a pen section, a cylindrical section connected thereto, a barrel connected to said section having a thread on its end adjacent to said'cylindrical section, a piston in said barrel having a hollow piston-rod open at its inner end, and

extending beyond said barrel, an extension sleeve connected to said rod, said sleeve abutting said barrel and holding said piston against one end of said barrel in fluid tight relation therewith.

'3.,As stated in claim 2: and means for preventing the disengagement of the extension sleeve and piston-rod, comprising a flange carried by the piston rod.

4. A fountainpen comprising a pen section, a barrel, a piston having a hollow piston-rod open at its inner end and extending beyond saidbarrel, and having a thread formed in its outer surface, an extension sleeve having a thread engaging thethread on the piston-rod and serving as a handle to move the-rod, means for preventing the disengagement of the sleeve from the rod comprising aflan e carried on the outer end of the piston-r0 and extending laterally beyond the thread to form an abutment for the sleeve. I I

In testimony whereof I- have aflix'ed my of different colored sections and sleeves by the use of which a very ornamental and at- I tractive pen may be'provide'dat a low cost.

. It is important thatthe material used in section 10 in which the piston slides, shall be made of a substance which will not easily v warp or change its form, suchas hard rubber 2 or bakelite, and it is preferable to use a wall of greater thickness for this section than is usually employed, and this may be done without unduly sacrificing claim as new:

the reservoir capacity 7 as this section is short. I Having thus described my invention I'-\

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