US2331606A - Fountain pen - Google Patents

Description

06a. 12, 1943. B. w. HANLE 2,331,606

FOUNTAIN PEN Filed May 14, 1942 INVENTOR D'lf/Q/YZZ/Z WHizn/e ATTORNEYS Patented Oct. 12, 1943 i FOUNTAIN PEN 1 Benjamin W. H anle, Elizabeth, .J.,' Ias s ig nor it 1 Eagle Pencil ware a plication-May 114, 1942, strait.442,8 6

Company, a corporation of Delam s. (o1. 120-47 1 1 The present invention-relates to fountain pens of the plunger or pistonfillertype.

As conducive to a clear understanding of the invention, itis noted that where the piston rodof a "pen of the foregoing type is equipped with an elaborate stufling box or gland to inhibit leak:

age, the construction is inherently expensivaan'd', I I

therefore, not applicable to popularpric'ed pens; moreover, even high-priced pens of this type are open to objection because-considerable force mustbe applied to-operate thepiston; in view of=the resistance imposed by the tightfitting stuffing box or gland, and as a consequence of resultant wear the same becomes loos'e in time and leakage'develop's;

It is an object of the present inventionto providea' pen of the plunger or piston type, which may be easily manipulated and in which the and" complete effectiveness in operation as will appear hereinafter; Where felt is used the samemay be impregnated withwax or the like, to serve as alubricant in the plunger operation."

Over the inner exposed face of the piston there is" superposed a. washer of diameter somewhat smaller than thatof the piston and desirably made of Celluloid or similar plastic. The

extremity of the reducedpiston rodend'I B is desirably upset as-at 2! over the-WasherZD to assemblethe piston to the piston rod.

Immediately beyond thepiston, the piston rod I! is provided with a unitary threaded'hub 22 ,Desirably, a small fibre washer 23 encircles the root of the reduced: end l8 and contacts the shoulder... defined between the" main length of I pistonrod'll. and its :reduced'end I8 at one face possibility of leakage is nevertheless effectively,

precluded throughoutthe life'of the penand sub-- stantially regardless of wear of the moving parts.

Another object is to provide a plunger fillerof I the above type which is adapted even 'to inexpensive pens, which dispenses withthe need for rubber or specialized piston material and which does notjnec'essitate' a pen barrel of inordinately large diameter and great length for any given .volume of ink storing capacity.

In the accompanying drawing is shown one of various possible embodiments of the several fea-,

general external appearance is conventional, in"- and the piston l9 at its other. The thread on the hub 22 co'acts with a thread 25' tapped into the nipple l5.- Desirably, double or triplethreads are used for ease and peed of operation.

In operation', theicap I6 is removed, theipiston rod'vll'is turned. to release the hub 22 and then pushed inward to expelthe air from-the barrel and f nally drawn upward with the pen point submerged in the ink bottle; -When' the threadedhub 22 reaches the barrel head l3, the piston rod,

I I1 is turnedto thread the hub 22 into place as eluding as itdoes a barrel l0, a section II at the forward end thereof, a pen point l2 and an associated feed (not shown).

The head l3 of the barrel has a bore that defines an annular shoulder 14 at the end of the barrel bore and presents a threaded nipple l5 upon which is removably threaded the cap l6 which houses the conventional .piston rod ll.

The piston rod has an inner end [8 of reduced diameter which extends through an axial holein the piston l9. That piston may be of any of a variety of compressible materials such as textile fabric, rubber, sponge, cork or the like, but felt shown in Fig. 1. At the end of the threading operation, the compressible piston l9 will be tightly through the reduced rod end l8 and pressure exerted thereby upon the washer 20, thereby to cause the piston I9 to expand peripherally into snug engagement with the barrelbore and to be forced at its inner face against the annular shoulder [4 at the head of the barrel. As a consequence, the piston snugly engages the barrel head and bore to preclude the possibility'of venting thereat and to maintain the ink in the barrel against, the possibility of leakage therefrom.

In the compression of the piston any ink absorbed therein Will drain therefrom into the barrel about the periphery exposed beyond washer 20. In the compression of said piston the felt will not be forced into the tapped bore 25 of the nipple l5 since thisis prevented by the fiber washer 23.

It will be seen that the piston when relieved of the compression in the home position of Fig. 1 need not hug the pen barrel tightly, and in view of the absence of stuffing boxes or glands, the

piston operates easily and without the needfor applying much force. Even though the piston is ordinarily P fe d by reason of i ow cost at has a relatively loose fit, the seal thereof in the compressed by tension transmitted claim as new and desire to secure by Letters- Patent of the United States is:

1. A fountain pen comprising a barrel, a com.

pressible piston, a piston rod carrying the same and means releasably locking said rod to said barrel for axially compressing said piston and maintaining it compressed in its outermost position, for peripheral expansion thereof into snug engagement with the inner wall of the barrel.

2; A fountain pen comprising a barrel, a compressible piston; a Dist-on rod carrying the same,

me nsfor locking the rod. its outermost Dos-i H011, and pistonv compression means connected to:

said r d, locking means for peripherally expands sai piston. nder the, compression exerted thereon, snugly to en age the innenwall of; the

barrel. l 1 l 3. A fountain pen comprising a barreLa compressible piston therein, a piston rod therefor, said rod having a thrfi ded hub adiaccntsaidpiston, said barrel having a tappedhead for accommodating said thread d hub .in the outermost position of the pi ton. and means connected to. said hub and at the inner end =01 said piston rod for exerting axial compression upon said piston when said hub is threaded home into. the end;- of

he barrel.

4. A fountain pen comprising a'rbarrel having:

a tapped head, a. compressible piston/in said barrel, a piston rod, having a. reducedendexe. tending axially through said piston, a relatively isid washer over the inner lace of said "piston, the inner end or the piston rod being upset over said washer. saidrodhavinc a threaded hubinear said piston for coaction. with the tapped head;

2,331,eoc

of said barrel for afiixing said piston in outermost position and concurrently effecting axial compression and peripheral expansion of said compressible piston.

5. A fountain pen comprising a barrel having a tapped head and presenting an annular shoulder at the outer end of the bore thereof, a compressible piston, .a piston rod therefor having a reduced end extending axially through said piston, means aflixing the inner end of said piston rod with respect to the inner face of said piston, and including a relatively rigid washer overlying the inner face of the piston, a washer about the base of the reduced piston rod end and retained between the main length of the rod and the outer face of the piston and of diameter substantially no greater than that of the piston, the length of piston rod adjacent to said washer comprising a threaded hub for coaction with the tapped head of the barrel, thereby to effect axial compression and peripheral expansion of the compressible piston.

6. A.- fountain pen comprising a barrel havin a tapped he dand pres nting an annular shoulder t the end-of the bore thereoi, a compressible piston, apiston-riod having a reduced end, a small fi er washe a out theoot oi said end, said re-V duoed end, extruding axially through said piston, a washer lot iame er smaller than that of said piston uperposed over the inner face thereof and about said reducedend, the latter having means at its extremity to maintain the parts in position substantially that of said rocl, a compressible; pistonemcirclingsaid reduced rodend, awasher,

of plastic material encircling the outer, end of said rod end,-.the latter being upset oversaid washer, the endof said rod immediately beyond said piston comprising a threaded hub.,

BENJAMIN ow. HANLE.

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