US2602422A - Fountain pen - Google Patents

Description

July 8, 1952 J. A. SHEA FOUNTAIN PEN Filed NOV. 6, 1948 lll/1,1111

IN VEN TOR.

alz Mga Patented July 8, 1952 f.

' UNITED STATES PATENT; v.()liFICl-I.. Y' f 2,602,422 f Y .v

FOUNTAIN PEN y lohn A. Shea, Jersey .City,rN. J. Application November `6, 1948, Serial No. 58,678

Z-Claims.

4This invention relates to fountain'pens and more particularly to the means of .holding .the cap .to the pen body.

Heretofore, due to tolerances in the manufacture of the fountain pen parts, the .cap would loosen from the body. An attempt Vwas Ymade to solve this diicultyoi temporarily attaching lthe `cap to the body, by forming the normally circular bore of the cap into anoval shape, and

then by pressure converting the oval-shape toa.

circular shape symmetrical to the outer circular shape of the pen body, or to a circular ring on the pen body. The objection to this proposal is that the cap with an oval Ashaped bore appears incomplete to the user, or makes the impression of a second. Other efforts have'been made, without entirely satisfactory results'.

This invention contemplates the solution 'of the problem and consists V`in the provision of a ring directly on the pen bodyhaving a bore to fit a cylindrical shoulder of a pen body which ring has an outer peripheral portion of -a contour symmetrical to the inner bore of the ring, that is, the ring has a constant thickness. One axis of the bore of the ring is larger than the diameter of the cylindrical shoulder of the pen body, and the axis at right angles to that axis, is smaller than that diameter. The'inner contour of the cap is circular, and concentric with the cylindrical shoulder, though radially spaced therefrom, vandwhen the cap is applied to the outer contour of the ring, a tight fit is obtained, by the inner circular contour of the cap having a diameter slightly less than the greatest outer axis of the ring, that diameter being longer than the shortest outer diameter of the ring. Thereby, a slight warping of the cap end takes place when the cap is applied to the ring, but this is so small as not to be noticeable. An advantage results in that a spacing of the capI from the ring remains, for the passage of air, thus preventing a suction pull when the cap is being removed from the ring.

The vinvention will be further described hereinafter, an embodiment shown in the drawings, and the` invention will be nally pointed out in the claims.

In the accompanying drawings:

Fig. 1 is a longitudinal section of the improved P611;

bFig 2 is an enlarged, partial sectional view; and

Fig. 3 is a transverse section taken on line 3,-3 of Fig. 1.

Similar characters of reference indicate cor- (Cl. 1Z0-42.05)

responding parts throughoutthe various views.

lof the casing IIabutsagainst the end of the Vring I3. The ring I3 being disposed between'the shoulder I6 and the casing IIb, is held'against axial movement. The sack I2 and the-screwthreaded partdlaoft'he cylindrical portion II is concealed'by the pen casing I'Ib', as known'.

The improvementconsists in Vhaving the'ring I3, which is preferably of U-shaped cross section as shown, so shaped as to be of thesame radial thickness throughoutjbu't instead of being circular, it has one axis larger than an axis at right angle thereto. The mean length of these axes is substantially equal to the outer diameter of the cylindrical portion II. When the ring lI3 is applied to portion II, a snug fit is provided against the shoulder I6, and in having the inner peripheral portion I5 of an axis length smaller than the outer diameter of the portion II, a tight t is obtained, the larger axis at right angles to the shorter axis being reduced to the extent of the enlargement of the smaller axis, by the pressure exerted by the portion II against the bore of the ring I3. Thereby, the ring I3 is held permanently on the portion II. The outer long axis I8 in relation to the outer short axis I9 of the outer contour I1 is in direct lproportion to the inner diameter of the open end of the cap 20, so that due to the inherent resiliency of the materialr forming the open circular end of the cap, one inner diameter of the open end of the cap will be slightly extended, and an inner diameter of the open end of the cap at right angles to said rst diameter will slightly contract.

In Fig. 3, one embodiment is shown in which the portion II is cylindrical, and shown as a circular peripheral contour, the smaller inner axis of the bore of the ring I3 provides a snug fit with the portion I I, and the larger inner axis of the bore I5 of the ring I3 at right angles to the smaller axis, is longer than the diameter of the portion II, thus providing spaces as shown. When a cap with a circular bore is applied to the outer contour I1 of the ring I3, then a snug fit along the axis I8 is obtained and spaces 2l are provided along the axis I9, the axis I9 being at right angles to the axis I8. In each case, the diameter of the circular contour corresponds to the mean axis of the inner or outer contour of the ring I3.

The invention is then the combination of a ring having a uniform thickness, with a bore to fasten it to a part of the pen body and with an outer peripheral contour to fastenaap; thereto. The ring hasinnerand outer elliptic contours, the mean axis of the outer contour of the ring corresponding to the inner diameter of the cir'- cular contour of the open end of the cap, and-the. c f

mean axis of the inner contour of the ring corresponding to the diameter of th'ecylindrical portion II of the pen body.V Thus, when thecap is applied, a secure hold is obtained, since on the application of the cap the axis I8`ma'y` yield. 1l

slightly in view of the yspace between the inner contour I5 and the portion Il. Also, ventilation spaces ZI between the outer contour of the ring and the bore of the cap are provided, which permit thereadyvremoval of the cap.

The rings I3 are conveniently made by manufacturing circular rings of the same thickness throughout, that is, of concentric inner and outer contour, and then subjecting-suchy circular rings to a slight pressure along any diameter, whereby the circular bore and external :contour-'is slightly attened.

shoulder adjacent said outer part anda screwthreaded portion extending beyond said subcaliber portion, a casing having interior threads I do not desire to be limiteur() the exact dtails for engaging said screw threads, and having an end, and a metallic ring of uniform radial thickness throughout its circumference, seated in a groove formed by said subcaliber portion, said adjacent end of the casing, and said shoulder, said ring vhaving a radially inner and outer concentric elliptical contour, the mean radius of the largest and smallest diameters of the outer contour ofthe ring `being substantially equal to the vinner .diameter'of the cairci'ila'r open vLend of the bore of aA cap' for the fduntain pen, "and the radius of the smallest diameter of the inner contour of the ring being slightly less than the outer diameter of the subcaliber cylindrical portion of the pen body, whereby the pressure of the cap on 'the outer'contour of the ring is translated yieldingly through .thering to the subcaliber cylindrical portion of the pen body.

2. A'fountain pen comprising a pen body having means dening a shoulder and a threaded,

'reduced portion'extending beyond said shoulder,

The following references areof record inthe le of this patent:

UNITED STATES PATENTS ANumber Name Date 2,278,907 Baker ",Aprql, 1942 2,414,245 j v Rudd 1 j Janin, 1947

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