FR2483851A1 - IMPROVED BALL PEN - Google Patents

Abstract

BALLPEN WHICH INCLUDES A TIP 12 EQUIPPED WITH A WRITING BALL 13 HELD IN A SOCKET AT THE ANTERIOR END OF THE TIP, AN INK CARTRIDGE 11 CONNECTED TO THE AUDIT TIP TO DELIVER INK INTO IT, THE TIP AND THE LADITE CARTRIDGE BEING HOUSED IN A PEN BODY, THIS BALLPOINT PEN BEING CHARACTERIZED IN THAT ITS TIP 12 INCLUDES: A CENTRAL LONGITUDINAL PASSAGE 15 FOR THE FLOW OF THE INK, IN ORDER TO FEED THE said BALL; A VALVE BOX, COMMUNICATING WITH THIS PASSAGE 15 THROUGH A REDAN PROVIDED WITH A PLURALITY OF GROOVES 14 FOR THE FLOW OF THE INK, THE INTERNAL DIAMETER OF THIS VALVE BOX BEING GREATER THAN THAT OF THE SAID PASSAGE; A VALVE BALL 17, HOUSED IN THE SAID VALVE BOX, SO AS TO FLOAT FREELY IN THE LONGITUDINAL DIRECTION OF THE SAID VALVE BOX AND, A VALVE SEAT 18 HAVING AN OPENING OF SMALLER DIAMETER THAN THAT OF THE VALVE BALL, A THE REAR END OF THE SAID BOX 16.

Description

2483a51

  The present invention relates to a personal ballpoint pen.

  prepared. We know (Figure 1) that a classic ballpoint pen has

  one end 2 carrying the writing ball 3 at the front end

  of an ink tank, or cartridge 1, housed in an envelope 4 constituting the body of the pen. When this ballpoint pen is used with its writing tip upwards or when this pen is held point 2 upwards,

  without being used, the ink which is contained in the point is

drips into the cartridge so that the quantity of ink contained in end 2 becomes insufficient, which makes writing

difficult, if not impossible.

  In order to avoid a return of the ink in the cartridge, one already proposed (see the Japanese utility model published under n 5661/1972 a ballpoint pen in which the anterior end of the point of the cartridge is fitted with a valve box of which

  the diameter is significantly reduced compared to that of the step

sage provided for the ink flowing from the cartridge, this valve box comprising a valve ball which is housed therein in a floating state so as to prevent a return to the cartridge of

the ink in the tip.

  In a ballpoint pen of this type, it is necessary to

  the valve box at the anterior end of the tip of the cartridge, near the ball and in addition, this valve box must be provided with small grooves allowing the passage

  ink and a seat for the ball forming a valve. He re-

a delicate machining which must be carried out with great care

  precision which makes it difficult to manufacture on an industrial scale

  trielle of this type of ballpoint pen.

  This invention proposes to provide a ballpoint pen

carrying a mechanism making it possible to prevent the ink contained in the tip from returning to the cartridge, this mechanism

being of very simple construction and being able to be manufactured eco-friendly

nominally on an industrial scale.

  Consequently, the subject of the invention is a ballpoint pen which comprises a tip provided with a writing ball held in a socket at the anterior end of said tip, an ink cartridge connected to said tip for bringing therein ink, said tip and said cartridge being housed in a body of

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  pen, this ballpoint pen being characterized in that said tip comprises: a central longitudinal passage for the flow of

  ink, in order to supply said ball; a valve box,

  providing with said passage via a step provided with a plurality of grooves for the flow of ink, the internal diameter of this valve box being greater than that of said passage; a valve ball housed in said boot

valve, so as to float freely in the longitu-

dinal of said valve boot and, a valve seat having an opening of smaller diameter than that of the ball

  valve at the rear end of said boot.

  Other features and advantages of this invention

  will emerge from the description given below with reference to

attached drawings which illustrate an exemplary embodiment thereof

  provided with any limiting character. In the drawings: - Figure '1 is a view in longitudinal axial section, showing the internal arrangement of a ballpoint pen of conventional type, as described in the preamble to the present

description;

  - Figure 2a is a longitudinal axial section of the tip of the ballpoint pen and part of the cartridge according to an embodiment of this invention, the tip being directed upwards; FIG. 2b is a sectional view along A-A of FIG. 2a and,

- Figure 3 is a view in longitudinal axial section iden-

tick in FIG. 2a, the point being directed downwards,

for using the pen.

  We refer to FIG. 2 in which we see an anterior part (ball side) of a ball pen which comprises: a

ink cartridge II; an end cap 12, fitted narrowly

ment at the open end of the cartridge; a writing ball

  ture 13 held in a socket at the front end of said tip 12; a step 14 formed in the hollow part of said tip, at its rear end; a plurality of grooves 14 'for

ensure the flow of ink. These grooves comprising or-

grooves 14 "distributed uniformly over the surface of the lower end of said step 14; a central passage for the ink 15 in order to deliver ink to the writing ball 13; a valve box 16, the internal diameter of which is greater than the internal diameter of the ink passage 15 and which receives a ball valve 17 mounted floating in the longitudinal direction of the nozzle

  12 and, a valve seat 18 produced by a reduction in the diameter

  meter from the wall at the open end of the vralve box 16, in order to form an opening 19 having a diameter smaller than

that of the valve ball 17.

The essential characteristic of the ballpoint pen according to this invention is that the seat 18 of the valve of the valve box 16 is not provided at the anterior end of the nozzle 12 as in the conventional devices preventing the return of ink in the cartridge, but it is provided at the rear end

of this nozzle, which allows the seat 18 to be produced by an operation

ration of simple machining, for example by stamping in order to reduce the diameter of the posterior part of the wall of the

valve box 16. In addition, instead of forming the seat 18 in use

  In the rear end part of the wall of the valve box 16, a separate pre-machined valve seat can be adjusted

  on the bottom part of the valve box.

In FIG. 2, the reference 20 designates a shoulder

in front of the stop when the end piece 12 is introduced into the cartridge

che 11.

According to a preferred embodiment, the grooves 14 'pre-

  views to ensure the flow of ink and which are arranged on the step 14, are distributed uniformly on the internal wall of the nozzle 12 so that, during a normal writing operation, the ink of the cartridge it freely crosses these grooves 14 'in the passage 15 and that (as shown in FIGS. 2a and 2b) the openings 14 "of the plurality of grooves 14' are present at the end of the step 14. It is understood that the diameter of the valve ball 17 is dimensioned so that this ball

  can float in the valve boot 16, in the longi-

tudinal end piece 12 and that it can press on the step 14 when the pen is oriented downwards, that is to say for a normal writing operation, with the ball 13 directed towards

the bottom.

  Given that the ball tylo according to the present invention is produced in the manner specified above, when the end of the pen is oriented upwards (FIG. 2a) the ball 17 of the valve 24e3854 is housed in its seat 18, under the influence of his own

  weight, which ensures the closure of the opening 19 thus preventing

  if the communication between the cartridge II and the nozzle 12. Consequently, the ink contained in the passage 15, constituting the bore of the nozzle 12, does not pass through the opening 19, which prevents any return to the ink cartridge contained in

passage 12.

  Furthermore, during a writing operation, tip down (Figure 3), the ball of the valve 17 is applied to the step 14 of the nozzle 12 under the effect of its own weight. The

grooves 14 ′, provided for the passage of the ink are however not

  not blocked, so that the ink feeds evenly

tie ball 13, from cartridge II and through

diary of the opening 19, the grooves 14 'and the axial passage 15.

It appears from the above description that the invention ap-

  carries a ballpoint pen with a mechanism preventing it from

  ink back into the cartridge, construction

  simple, economical and can be manufactured on a large scale.

Of course, this invention is not limited to

  tée in the embodiment described and shown but that it

includes all variants.

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REVEWICATIONS

  I.- Ballpoint pen which comprises a tip (12) provided with a writing ball (13) held in a socket at the front end of said tip, an ink cartridge (11) connected to said tip to bring there ink, said nozzle and said cartridge being housed in a pen body, this ballpoint pen being characterized in that said nozzle (12) comprises: a central longitudinal passage (15) for the flow of the ink, in order to supply said ball; a valve box (16), communicating with said passage (15) via a step provided with a

  plurality of grooves (14 ') for the flow of ink, the dia-

  internal meter of this valve box being greater than that of said passage; a valve ball (17) housed in said box

  with valve, so as to float freely in the longitu-

  dinal of said valve box and, a valve seat (18) pre-

  feeling an opening of smaller diameter than that of the ball

  valve, at the rear end of said box (16).

  2.- ballpoint pen according to claim 1, characterized in that the grooves (14 ') provided in the step (14) to ensure the passage of the ink, are distributed uniformly on the wall

internal tip (12).

  3.- ballpoint pen according to one of claims 1 or 2,

  characterized in that the valve seat (18) is formed by machining the rear end part of the wall of the

valve box (16).

  4.- ballpoint pen according to one of claims 1 or 2,

characterized in that the valve seat (18) constitutes a separate prefabricated element mounted on the bottom of the valve box (16).