US1985643A - Fountain pen - Google Patents

Description

Dec. 25, 1934. c. PFANSTIEHL 1,985,643

FOUNTAIN PEN Filed March 16, 1934 Patented Dec. 25, 1934 l v 1,985,643 I UNITED STATES PATENT OFFICE FOUNTAIN PEN cm Pfan'stiehL Highland Park, n1., asslgnor a The Parker Pen Company, Janesville, Wia, a corporation of Wisconsin Application March 16, 1934, Serial No. 715,922

8 Claims. c1. 120-41) My invention relates to fountain pens and par- Fig. is a plan view of a resilient segment emticularly to that class generally known as pump .ployed in aflixing the diaphragm to the end of filled in which the ink sac is eliminated and a the plunger. 1 pump mechanism is used to draw ink into the In the drawing the numeral'lo is generally 5 barrel. More specifically, my invention has to do used to indicate the means employed for affixing 5 with pump fill pens utilizing a rubber diaphragm the pump to one end of the pen barrel as it is not as a part of the pump mechanism such as disthought necessary to specifically describe the closed in the patent to Arthur 0. Dahlberg, Numvarious parts in that they are exactly similar to her 1,904,358, issued April 18, 1933. that disclosed in the co-pending Tefit application The pump mechanism disclosed in the drawing named above.

forming a part of this application is similar to The numeral 11 indicatesa reciprocable plungthat disclosed in the co-pendingapplication of er which actuates a diaphragm 12 which is adapt- Ivan D. Tefft, Serial Number 636,436, filed Octoed to roll upon itself when the plunger is recipber 6, 1932, the only change being in the shape and rocated, causing a reduction in the air pressure i manner of attaching the rubber diaphragm to the within the barrel, in this manner drawing ink into 1 end of the reciprocating metal sleeve or plunger. the pen- I It is to be particularly noted that the diaphragm As stated in the preamble, the diaphragm 12 is disclosed in the said Teilt application has a fabricated from purelatex and is formed on a. flanged nipple formed in the bottom end thereof, mandrel by what is commonly known as the anode I which flanged nipple is introduced into the lower process. The said diaphragm tapers from its 2 open end of the reciprocating plunger, the flanged mid-section to the closed end and the said closed shoulder of the said nipple engaging 'on the underend is formed in the shape of a nipple designated side of the formed shoulders adjacent the aperas 13, the restriction of the nipple 13 forming a ture in the plunger, which assembly, in conjunoshoulder 14, the outer diameter of that portion i tion with a segment or plug which is force fitted of the diaphragm at the shoulder being a trifle in the inside of the sleeve and pressed against larger than the outer diameter of the lower end the inner face of the nipple, firmly locks the of the plunger 11. In the forming of the plunger lower end of the diaphragm to the lower end of 11, the lower end is turned inwardly to form a the plunger; shoulder 15 and a restricted aperture 16.

l The manufacture ofadiaphragm suchas shown The assembly of the diaphragm and plunger in the Tefit and Dahlberg applications necessiconsists in slipping the nipple 13 through the retatesthe use of a molding rubber, the composistricted aperture 16 and then introducing a retion of which is not as impervious to ink as pure silient plug 17, the diameter of which is larger latex, and as pure latex cannot be successfully than the diameter of'the aperture 16, into the molded in the form disclosed in the diaphragm of open end of the diaphragm and forcing said plug Dahlberg, I have conceived a method of afllxing through the aperture 16 to the end of the nipple.

a slightly changed form of diaphragm to the Immediately the said resilient plug passes through plunger, which diaphragm may be made from the aperture 16 it expands, thus expanding the pure latex. end of the nipple and securely locking the said To more fully understand my invention, referdiaphragm to the end of the plunger. The dia- 40 ence should'be had tothe accompanying drawphragm is then rolled on itself as to encompass ing in which: I the lower portion of the plunger and the complet- Figure 1 discloses a sectional fragmentary view ed assembly is screwed into the barrel. of t e pp e d of a o a n p n disclosing a Having described my; invention, what I claim pump in y p d p agm is inand desire to secure by Letters Patent is: corporated; t 1. In a fountain pen employing a pump fill Fig. 2 is a view partially in plan and partially mechanism, a vacuum pump, means for afl'ixing in section which shows the lower end of a recipand Supporting Said pump in 5, fountain pen Barrocable plunger with diaphragm attached disrel, a reciprocable plunger, a diaphragm, one end closing my improved means for attaching the diaof which is fixed to the barrel and the other end P agm to the said plunger; to the plunger, an aperture in the lower end of. ma 3 s av w f y mp v d diaphra m parsaid plunger in which the closed end of the diatially in Section d Partially in P Dhragm is adapted to be inserted, expansible 4 is a i w al t e l e o gmeansadapted to be forced throughthe aperture and in the lower end or the plunger into the inserted end of the diaphragm, the resulting expansion of the expansible means and diaphragm end efiecting a lock between the said plunger and diaphragm.

2. In a fountain pen the combination of a barrel, a plunger operable within said barrel and having an opening at its lower end, a diaphragm secured to said barrel, a portion of said diaphragm passing through and received within said plunger opening, and self-expansiblemeans exteriorly insertable through said diaphragm portion for securing thediaphragm to said plunger for operating movement therewith.

3. In a fountain pen the combination of a barrel employing a pump fill mechanism, means for aiiixing and supporting said mechanism in said barrel, a reciprocable plunger having an opening, a diaphragm having a nipple portion formed therein, the nipple portion being insertable through said plunger opening, and means exteriorly insertable with said diaphragm nipple for automatically locking said nipple portion within said .plunger to permit operation 'of said diaphragm by said plunger.

4. In a fountain pen the combination of a barrel, a reciprocable plunger operable within said barrel, and having an opening in its end within said barrel, a diaphragm secured to said barrel and having a hollow portion insertable through said plunger opening and within said plunger, an expansible plug insertable through said plunger opening and within said hollow diaphragm portion, said plug being. adapted to expand the diaphragm portion within the plunger beyond the circumference of the plunger opening between the plunger and diamay be forced through said plunger opening it.

will expand beyond the side of 'said opening when inserted in said extension to prevent withdrawal of said extension during operation of said plunger.

6. A filling mechanism for a fountain pen of the pump filled kind which comprises a flexible diaphragm of an elongated form having a closed and reduced end portion, a plunger having an aperture in one end adapted to receive said reduced diaphragm end portion, said plunger being adapted for actuation to flex said diaphragm, and means for securely locking said diaphragm to said plunger which includes an expansible element inserted within said reduced diaphragm end portion through said plunger opening and of such size that it is contracted in being so forced through said plunger opening and expan when as an ink reservoir, and filling mechanism which includes a flexible diaphragm, means for securing the diaphragm peripherally to said barrel to close one end of said barrel and the reservoir, a member associated with said end of the barrel for flexing said diaphragm, said member being connected to said diaphragm at a central portion thereof, said member having an opening therein to receive an imperforate part of said diaphragm, and resilient means of greater size than said opening adapted to be inserted through the opening-received part of said diaphragm within said member opening and adapted to expand when so inserted to prevent withdrawal of said diaphragm from said member and to securely lock said parts together.

8. A filling mechanism for a fountain pen of the pump-fill type which comprises a reciprocable plunger, a diaphragm, said plunger having an aperture in one end thereof and said diaphragm having a reduced and closed end portion which is received within said plunger opening, and expansible means adapted to be forced within said reduced end portion of said diaphragm through said aperture in said plunger into the inserted end portion of said diaphragm, said expansible means being adapted to contract when being, forced through said aperture and to expand when inserted therein to eifect a lock between said plunger and diaphragm.

CARL PFANS'I'IEHL.

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