FR2612845A1 - WRITING INSTRUMENT OR LIQUID APPLICATOR - Google Patents

Abstract

THE INSTRUMENT OF THE PRESENT INVENTION INCLUDES A FUT 6; A RESERVOIR 7 FOR AN APPLICATION LIQUID DEFINED IN THE FUT; AN ELEMENT FOR WRITING OR APPLYING LIQUID 13 FOR APPLYING THE LIQUID TO AN OBJECT MOUNTED IN THE PREVIOUS END OF THE FUT; A VALVE ASSEMBLY 8, 9 IS PROVIDED BETWEEN THE TANK AND THE APPLICATION ELEMENT; A DISC 17 ACTING AS A PISTON COMPRISING A ROD 16 MOUNTED AT ITS REAR BEING SURFACE, THE DISC CAN SLIDE INTO THE RESERVOIR SO AS TO BE MADE IN WATERPROOF CONTACT WITH THE TANK, THE PISTON ROD 16 HAVING A MULTITUDE OF LATERAL PROJECTIONS SAW TEETH 19 ON ITS OUTER SURFACE AT PREDETERMINED INTERVALS ON ITS LONGITUDINAL AXIS; A PUSH SLEEVE 24 PROVIDED OUTSIDE OF THE PISTON ROD OF THE DISC AND INCLUDING AN INTERIOR SPACE ENLARGED AT THE ANTERIOR END, CONTIGUOUS TO AN ANTERIOR EDGE OF THE SLEEVE, THIS EDGE EXTENDING RADIALLY INNER; A 30 PUSH CYLINDRICAL ELEMENT COMPRISING A FLANGE, MOUNTED WITH GAME ON THE PISTON ROD IN THE ENLARGED INTERIOR SPACE OF THE SLEEVE, THE FLANGE EXTENDING RADIALLY INWARD; AND A MEANS FOR CONTROLLING THE LENGTH OF THE STROKE OF THE PUSH SLEEVE TO KEEP IT CONSTANT.

Description

The present invention relates to a writing instrument

  liquid applicator for the application of liquid

  quides such as writing ink, a liquid product for beauty care, a paint, a medicine, a glue, etc. In a writing instrument or a liquid applicator of the conventional type, a device for valve, used for

  check an application liquid supplied to the application part

  plication. In the operation of the instrument or

  the applicator, although a predetermined amount of the liquid

  to be constantly supplied to the application part by

  through its valve assembly during operation-

  nement of the latter, it is very difficult to obtain that

  this supply is constant. This is a problem

  inherent in conventional instruments and applicators of this type. The object of the present invention is to solve the above problem by providing a writing instrument or a liquid applicator which has a simple construction, which is easy to manufacture and which allows the user to obtain a constant supply of a predetermined amount of application fluid each

  once it actuates the valve assembly of the instrument.

  According to the present invention, an instrument is provided.

  writing instrument or a liquid applicator comprising: - a barrel;

  - a reservoir for an application liquid,

finished in the barrel;

  - an element for writing or applying li-

  that intended to apply the liquid to an object, mounted in the anterior end of the barrel; - a valve assembly arranged between the reservoir and the application element; a disk acting as a piston comprising a rod mounted at its rear while projecting, the disk being able to slide in the reservoir so as to be brought into sealed contact with the reservoir, the piston rod having a multitude of lateral projections in teeth of

  saw on its outer surface at predetermined intervals-

  mined on its longitudinal axis; - a thrust sleeve disposed outside of

  the piston rod of the disc and having an internal space

  laughter enlarged at the anterior end, contiguous to a

  front edge of the sleeve, this rim extending radially-

  inward; - a cylindrical thrust element comprising

  a flange, mounted with play on the piston rod in the es

  enlarged inner space of the sleeve, the rim extending radially inward; and - a means for controlling the length of the stroke

  of the thrust sleeve so as to keep it constant.

  The present invention will be clearly understood on reading

  ture of the following description made in relation to

attached drawings, in which:

  Figures 1 and 2 are cross-sectional views

  line of a marking pen which constitutes a method of

  reading of the writing instrument or the liquid applicator of the present invention;

  Figure 3 is a sectional view of the pen

  line of the present invention, taken along the line III-III in Figure 1, and

  Figure 4 is a sectional view of the pen

  cage, similar to that of Figure 3, when the push sleeve is retracted so that the hook portion of this sleeve passes through the toothed projections of

  disk piston rod saw.

  We will describe below a marking pen which

  constitutes an embodiment of a writing instrument

  liquid applicator of this invention

  tion. It will appear that the invention is not limited to

this embodiment.

  In the drawings, the reference 6 represents a barrel of marking pen. The barrel 6 defines an ink tank 7, and has a part 1 of small diameter with

  its anterior end. The outer peripheral surface

  part 1 of the barrel is threaded so as to form a male thread 3 onto which a barrel is screwed

  front 15 in which is mounted an applicator element 13

  tion of ink. This element has a base portion 14 in the form of a rim at its rear end. The base part 14 is fixed between an internal shoulder of the front barrel 15 and a guide ring 12 fixed in the axis

  front of part 1 of the barrel 6. The front end of the barrel

  application ment 13 extends outside the end

front tee of the barrel 15.

  Part 1 of small diameter of barrel 6 communicates

  that with this barrel through an opening forming the valve seat 4 of a valve assembly which further comprises: a valve stem 9 having an extended head 8 with a

  conical edge through which the rod abuts

  be seat 4; a valve spring 10 consisting of a spiral spring mounted between the surface of the rear end of the guide ring 12 and the flat surface of the front end of the part 8 of the valve stem 9;

  the guide ring forming a spring support. Over there-

  guideway 12 has a central through hole 11

  in which the front end of the rod 9 slides.

  A disc 17 forming a piston slides axially

  in the ink tank 7; this disqoe has a rain-

  re annular in its outer peripheral surface, in which an O-ring 18 is mounted to make

  seals the clearance created between the outer peripheral surface

  disc 17 and the inner peripheral surface

  re of the tank 7, which is defined by the barrel 6 and the over-

  face of the front end of the disc 17 so that the

  cre is received in the reservoir at the front of disc 17.

  A piston rod 16, which constitutes a part of the disc 17, extends between a central part of the

  rear surface of the disc 17 parallel to the axis lon-

gitudinal of the barrel 6.

  The piston rod 16 is provided with a multitude

  of sawtooth projections 19 spaced the same distance

  tance on its outer peripheral surface. Each sail-

  lie 19 has, in a sectional view, the shape of a triangle

  consisting of a vertical rear surface perpendicular to

  re to the longitudinal axis of the barrel 6, and of a conical front surface. Each projection 19 can be annular and be

  consisting of a series of projections arranged in the di-

  circumferential rection of the piston rod 16.

  A cylindrical thrust sleeve 24 is mounted with the clearance on the piston rod 16 in the barrel 6, as shown in Figure 1. The sleeve 24 has

  a front edge 27 extending radially inwards

  laughing. The rim 27 has a central hole through which

  is the piston rod 16. The sleeve 24 has a part

  tie 21 enlarged at its rear end at the rear of a shoulder 31 of the sleeve. The enlarged part 21 has a

  diameter greater than that of the sleeve 24, and receives a plug

push button 20.

  In the sleeve 24, between the rear surface of the front flange 27 and the front surface of an inner front shoulder of the sleeve is formed an enlarged front interior space in which is mounted a cylindrical element

  thrust 30 having a front edge 29 which extends ra-

  inwardly dialing. As shown in Figures

  3 and 4, the element 30 has a pair of slots

  tudinal 32 which extend between the front end of the rim 29 and a position located in the vicinity of the

  rear part of the pushing element 30, and are oppo-

  to each other. The number of slots 30 can, if

  be necessary, be greater than two.

  The pushing element 30 has a slight length.

  less than that of the enlarged interior space of

  the front end of the sleeve 24. In this space, the lar-

  rim of the rim 29 of the thrust element 30 in the di-

  radial rection of this element is slightly smaller

  that the clearance between the inner wall of the sleeve 24 and the ex-

  end of the projection 19 of the piston rod 16,

  te that the radially innermost end of the flange 29 is disposed at a location closer to the axis

  of the rod 16 as the end of the projection 19 of the ti-

piston age.

  In the marking instrument of this mode of

  realization, as illustrated in Figure 1, the man-

  chon 24 is made up of two components so that

  read the pen assembly operation. However, the sleeve 24 may comprise only one component, in the

  measure that this component, or sleeve 24, does not interfere with the

  pretense. The rear part of the barrel 6 is enlarged in a

  tiered arrangement to form a first shoulder

  interior 25 and a second interior shoulder 23,

  so that the inside diameter of the barrel 6 between the shoulders-

  23 and 25 is slightly smaller than the outside diameter

  of the rear end of the sleeve 24. In the man-

  chon 24, the first shoulder 25 forms a support for the former

  front end of a spiral spring 26 mounted between the shoulder

  the outer 31 of the sleeve 24 and the first shoulder

  inside of the barrel 6. On the other hand, the second shoulder

  23 of the barrel 6 serves as a stop to prevent the shoulder-

  ment 31 does not move forward beyond the second shoulder

  23, during the abutment against the shoulder 31 of the man-

chon 24.

  In a rear opening of the barrel 6 is fixed a

  x rear cap 5 having a central opening through the

  which extends the b = hon 20 in the direction of the back-

  re. The inner diameter of the central opening of the bou-

  chon 5 is less than the outside diameter of the end

  rear tee of the sleeve 24 in order to prevent the sleeve from

  through the central opening of the plug 5.

  In order to keep the distance between

  be the rear side surface of the second shoulder 23 of the barrel 6 and the front side surface of the plug 5, a compression spring or spiral spring 26 is mounted between the

  rear side surface of the first shoulder 25 and the surface

  this front side of the part 21 of the sleeve 24. The distan-

  this mentioned above corresponds to the length of the thrust stroke of the sleeve 24 and to an interval between

  protrusions 19 of the piston rod 16.

  In the pen of the present invention, each component can be made of a conventional material such

  than synthetic resin etc ... In the present invention

  tion, there is no limitation regarding these materials.

  Figure 1 shows the case where the style

  lo is not subjected to a pushing operation, i.e.

  say it is "at rest". In this situation, when 7 'the user presses with his thumb or one of his fingers

  on the thrust plug 20 against the elastic fo-

  tick exerted by the spring 26 until the surface on the front side of the enlarged part 21 of the thrust sleeve 24 abuts against the surface on the front side of the second inner shoulder 23 of the barrel 6, the sleeve 24 advances in a

  predetermined stroke length as shown

tee in Figure 2.

  When the sleeve 24 advances as just described, the pushing element 30 is also moved

  forward with sleeve 24 as shown in Fig.

  gure 1, so that the front side surface of the rim 29 of the element 30 abuts the rear side surface of the projection 19 of the piston rod 16 to move the rod 16 and the piston disc 17 forwards by compared to

was 6.

  More precisely, the disc 17 advances by means of the rod 16 relative to the barrel 6 by an amount equal to the predetermined length of the stroke to cause the increase in pressure inside the ink tank 7, so that the valve stem 9 is moved forward relative to the seat 4 against the elastic force of the valve spring 10, from which it follows that the ink received in the reservoir 7 can flow from the reservoir to the ink application element 13 through

  through valve seat 4. After supplying

  re a predetermined amount of ink at the element 13, the valve stem 9 is brought back under the effect of the elastic force of the spring 10 to sit on

  seat 4 due to the pressure drop in the tank

  see 7 caused by the flow of ink. Then, when the user releases the plug 20, the thrust sleeve 24 returns to its initial rest position illustrated in Figure 1 under the effect of the elastic force due to the spring 26. At this time, as shown in Figure 4 , the pushing element 30 also moves towards

  the rear with the sleeve 24 because the rim 29 of the element

  ment 30 abuts against the surface rear side of the rim

  27 of the sleeve while being easily moved radially-

  outward due to the presence of windows

  tes 32 to allow the projections 19 of the piss rod

  tone 16 to cross the rim 29 of the element 30, from which it follows that the piston rod 16 cannot move

rearward.

Claims (1)

  1. Writing instrument or liquid applicator   de, characterized in that it comprises: - a barrel (6); - a reservoir (7) for an application liquid defined in the barrel;   - an element for writing or applying liquid   (13) for applying the liquid to an object, mounted in the anterior end of the barrel; - a valve assembly (8, 9) disposed between the reservoir and the application element; - A disc (17) acting as a piston comprising a rod (16) mounted at its rear while projecting, the disc being able to slide in the reservoir so as to be brought into tight contact with the reservoir, the rod   piston (16) having a multitude of projections la-   sawtooth tera (19) on its outer surface at predetermined intervals along its longitudinal axis;   - a thrust sleeve (24) disposed outside   of the piston rod of the disc and comprising a   interior space enlarged at the anterior end, contiguous to an anterior rim of the sleeve, this rim extending radially inward;   - a cylindrical thrust element (30) comprising   both a rim, mounted with play on the piston rod in   the enlarged interior space of the sleeve, the rim extends   radially inward; and   - a means to control the length of the court-   from the push sleeve so as to keep it constant.