US2037177A

US2037177A - Fountain pen

Info

Publication number: US2037177A
Application number: US716782A
Authority: US
Inventors: Nathan W Paquette
Original assignee: Parker Pen Co
Current assignee: Parker Pen Co
Priority date: 1934-03-22
Filing date: 1934-03-22
Publication date: 1936-04-14
Anticipated expiration: 1953-04-14

Description

April 14, 1936. N.` w. F'AQUETTEl FOUNTAIN PEN M ,v f A. s I [if my i Willlm lll d ,$1111 f. 7 gfx( \\\X 1 .3 0 -l. W... 0K J /n 4,

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@Tm/way Patented Apr. 14, f 1936I 'UNITED STATES PATENT ori-ice FOUNTAIN PEN Nathan W. Paquette, Janesville, Wis., assigner to The Parker Pen'Company, Janesville, Wis., a corporation oi' Wisconsin Application March '22, 1934, serial No. 716,782

1 claim. (ci. 12o-746) My invention relates to fountain pens and particularly to that class lgenerally designated as pump fillers. More particularly it relates to the class of pump ller pens that employ ag rubber diaphragm which, when actuated, tends to create a partial vacuum4 within the barrel to draw ink thereinto through the apertured section. An analogous `device is disclosed in the patent to Arthur O. Dahlberg,`Number 1,904,358, April 18, 1933. However, inthe instance of the Dahlberg structure the rubber diaphragm is rolled upon itself in the filling operation, whereas in my device the diaphragm is adapted to be twisted to produce the same result.

The principal object of my invention is to provide a pump ll structure, the mechanical construction of which is such that a greater vacuum will be created within the pen barrel upon actuation `of the pump than is found in other structures 'of the same type.'

Another object is to' provide a mechanism which 1 is exceedingly simple in construction and economical to manufacture.

rear end of a pen barrel with my improved pump' mechanism mounted therein;

Fig. 3 is a view partially fragmentary and partially plan of my improved pump unit;

Fig. 4 is a plan view of a sleeve which forms a part of my invention.

n In the -drawing the numeral I 0 will be used generally to indicate the barrel of a fountain pen and the 4numeral Il the section thereof. 'A nib and feed assembly I2 are fitted into the open end of the section, the feed being longitudinally drilled to receive a vent tube I3 through which air from within the barrel is vented upon actuation of the pump mechanism. rIhefeed is providedi with the ordinary ink channels to convey ink from the interior of thebarrel tc the pen point. A

The barrel I0 is axially drilled to provide an ink reservoir I4 and the rear end of the said chamber so formed is internally threaded as at I 5 to receive the pump unit. The pump unit consists of a threaded bushing I6 havingla reducedl threaded end I1. The said threaded end isadapted to receive an internally threaded blind cap I8 which serves to cover the otherwise exposed end of the pump. The bushing I 6 is also reduced at the opposite end, the reduced portion being I5 tapered to receive a rubber diaphragm I9, which is aiiixed tothe said tapered reduced portion of the bushing I6 through the medium of a tapered collar 20 which is forced onto the taperedend of the bushing I6 after assembly of the skirt of the 10 diaphragm thereover.

Grooves 2l are milled in the surface of the tapered end of the bushing I6 in order to more eiiectually affix the diaphragm to the tapered end of the bushing as portions of the rubber skirt l5 of the diaphragm between the collar'and the bushing will be forced into the grooves,y thus firmly afilxing the diaphragm to the bushing I 6.

The opposite end of the diaphragm -isclosed 20 and is ailixed to a plunger 22 .in much the same manner as the skirt portion of the said diaphragm is fixed to the bushing I6. The plunger 22 has an enlarged tapered head 23 having grooves 2t milled therein. The head of the plunger is inserted through the open end of the diaphragm to the closed end thereof, and a tapered collar 25 is forced over the said closed end, thus ailixing the said end of the diaphragm to the enlarged tapered end of the plunger. The upper end of the plunger is approximately twice the diameter of the plunger ste'm and is adapted to extend through the bushing I6 in order that the dia*n phragm may be actuated. That part of the said plunger extending from the bushing is enlarged and knurled as at 26 in order that the user may have a better grasp on it.`

A sleeve 2l is force fitted into the top open end of the bushing until the outer end of the said sleeve is ush with the top of the said bushing. l'I'he said sleeve 21 has a spiral slot 28 stamped thereinthe purpose of which will be explained hereinafter. A lug 29 is press fitted into a drill hole 30 in the plunger stem and the end of the lug is adapted to project from the wall of the plunger a suiiicient distance as t6 engage the spiral slot 28 and the sleeve 21. In order to effect the assembly of the lug within the spiral slot, it is necessary that the sleeve -'-2'l be sprung over the vlug prior to the force fitting of the said sleeve within the bushing.

The assembled pump unit is then screwed into the upper threaded end Aof the barrel until the shoulder formed by reduction of the outer threaded end is ush with thetop edge of the said 65 barrel, whereupon the mechanism is readyl for use.

'I'he pump functions as follows:

The userl removes the blind capl I8 and grasps the projecting end of the plunger 26. The point end of the pen is inserted in ink and the plunger stem rotated, which action, because the opposite end of the plunger is fixed to the closed end of the diaphragm and the open end of the diaphragm is amxed to the stationeryv bushing I6, will cause the said diaphragm to be twisted, and due to the displacement of the diaphragm bulk will cause the air pressure to be lowered within the barrel creating a partial vacuum therein causing ink to be sucked through the section into Y the said barrel.

It is to be particulars' noted that due to the engagement of the pin 29 in thevspiral slot 28 s,os7,177 i phragm twists due to actuation of the plunger,

it naturally tends to shorten and as the plunger recedes from the interior of the barrel simultaneously with the shortening of the diaphragm, the combined twisting and shortening of the dia.- phragm will cause a greater air displacement to be had within the barrel than were the plunger to be rotated in the same plane. The fact that greater displacement is effected will increase the vacuum Within the pen barrelI and more ink will be drawn thereinto and it will necessitate fewer actuations of the plunger to effect the complete lling of the pen.

Having described my invention, what I claim and desire to secure by Letters Patent is:

In a fountain pen, an ink reservoir barrel, having at one end passages for ink and air, combined with a twist-sac located within, supported at, and vented toward the other end of the barrel, and having an impervious wall extending into the reservoir; and a rotatable element engaging torsionally a deep part of the sac, thereby by twisting the sac to change displacement of the reservoir; and means for limiting the twisting of the sac to less than a full rotation of said rotatable element.

NATHAN W. PAQUE'I'I'E.