EP0888824B1 - Manual pump with a free sleeve piston - Google Patents

Manual pump with a free sleeve piston Download PDF

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Publication number
EP0888824B1
EP0888824B1 EP98401668A EP98401668A EP0888824B1 EP 0888824 B1 EP0888824 B1 EP 0888824B1 EP 98401668 A EP98401668 A EP 98401668A EP 98401668 A EP98401668 A EP 98401668A EP 0888824 B1 EP0888824 B1 EP 0888824B1
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EP
European Patent Office
Prior art keywords
rod
pump
piston
sleeve
cylindrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98401668A
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German (de)
French (fr)
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EP0888824A1 (en
Inventor
stéphane Beranger
Yannic Hermouet
Claude Jouillat
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Aptar France SAS
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Aptar France SAS
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Filing date
Publication date
Priority to FR9708526 priority Critical
Priority to FR9708526A priority patent/FR2765638B1/en
Application filed by Aptar France SAS filed Critical Aptar France SAS
Publication of EP0888824A1 publication Critical patent/EP0888824A1/en
Priority claimed from US09/346,821 external-priority patent/US6209759B1/en
Application granted granted Critical
Publication of EP0888824B1 publication Critical patent/EP0888824B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus
    • B05B11/30Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus the flow being effected by a pump
    • B05B11/3001Piston pumps
    • B05B11/3023Piston pumps having an outlet valve opened by deformation or displacement of the piston relative to its actuating stem

Description

The present invention relates to a manual pump for the distribution of fluid products, such as perfumes, and relates more particularly to a manual pump for the distribution of fluid product according to the preamble of claim 1.

A pump of this type is notably known from the document EP-A-0 453 357. This pump comprises a rod actuator movable in a pump body. A piston in the form of a deformable elastic cuff is mounted on the actuating rod. This piston slides tightly against the inner wall of the body of also pumps and closes cross channels which lead to the internal channel of the actuating rod. The upper end of the cuff that forms the piston is in abutment abutment against a shoulder formed by the actuating rod. So as soon as the pressure reaches a sufficient level, the cuff deforms while remaining abutment support against the shoulder of the rod actuation so as to withdraw from the channels transverse, so that the fluid under pressure in the pump chamber passes through these cross channels and the internal conduit of the actuating rod. In the pump described in this document, the piston / sleeve is therefore always subject to a constraint on the height of the cuff between the stop on the shoulder of the actuating rod and the sealed contact of the lip of the piston with the internal wall of the pump body. Through therefore, the cuff tends to deform under the effect of this permanent constraint so that it no longer completely seals the channels transverse of the actuating rod.

Another pump of the same type is known from the document FR-1 544 683. The pump described in this document includes also an actuating rod on which is mounted a piston in the form of a cuff. The piston includes leak-tight sealing lips against the inner wall of the pump body. Headlines tightly closes transverse conduits which lead to the central channel of the actuating rod. Of similar to the above document, the end upper cuff is pressed against a shoulder formed by the actuating rod. Headlines has a thinner section, which gives a certain elasticity by bending. This elasticity by bending is used to release the cross ducts when the pressure inside the pump chamber reaches a sufficient level. The again, the cuff is permanently subjected to a axial stress exerted between the stop against the shoulder of the actuating rod and another stop also formed by the actuating rod just below the cross ducts.

Document FR-2,563,287 further describes a pump with cuff forming the piston whose upper end engages on a frustoconical surface by deformation radial to perform the spring function. The downside with this type of spring is that the cuff remains stuck on the frustoconical surface and does not descends more to close the transverse conduits. The the pump is then unusable. In addition, at rest, the cuff is subject to permanent stress, since it is wedged between the frustoconical surface and a stop rim defined at the lower end of the rod actuating.

We also know other pumps of this type using a free piston with cuff mounted on the rod actuating. Some use a spring precompression that urge the piston into a position able to seal the transverse conduits of the rod actuating. We can notably cite the document FR-A-2 399 286. Other pumps of the prior art do not use any means to stress the free piston so there is no precompression.

So in all the precompression pumps free piston, that the spring function is ensured by a conical surface (FR-2 563 287), a section of deformable sleeve (EP-A-0 453 357) or a spring, the cuff always remains under stress permanent at rest.

The object of the present invention is to overcome the aforementioned drawbacks of the prior art by defining a manual precompression pump including the cuff of the piston is not subject to any permanent stress and which therefore has better resistance to aging.

To achieve this object, the present invention has for subject a manual pump as defined by the characteristics of claim 1.

The spring function is here ensured by the friction force differential. Indeed, as soon as the pressure has dropped in the pump chamber after opening the outlet valve, the piston remains momentarily static with respect to the pump body until the stem comes to pick it during its ascent to its rest position. The piston is then in contact pressed on the rod to close the valve output, this contact being proportional to the difference of friction forces existing between the rod and the body of pump. But, since according to the invention, this differential is positive in favor of the pump body, we guarantee closing the outlet valve at the start of the raising the actuating rod. We can thus go from a precompression spring or means equivalents as described in the above documents of the prior art.

Advantageously, the rod has a stop surface with which the piston cooperates during its sliding upward to create a seal at this level. Being since the friction forces must be low between the piston and the rod, it is preferable to plan means ensuring a seal at this level. This stop surface does not generate any stress or friction force when the pump is at rest, nor when of its initial activation phase. It is only when the pump reaches its maximum internal pressure as the piston abuts this surface to ensure sealing.

According to a practical form, the piston includes a cuff surrounding the actuating rod, said cuff having a lower end in contact sealing at rest with the actuating rod for form the outlet valve and an upper end adapted to cooperate with the rod stop surface during sliding the piston upwards. advantageously, the internal diameter of the cuff engaged on the rod actuation is greater than the external diameter of the actuating rod. Preferably, the stop surface is frustoconical flaring outwards. In that case, the upper end of the cuff defines an edge upper circular stopper sealed with surface Stop. Preferably, the sealed stop edge is defined by the upper end of a step internal, the outlet valve has a contact cylindrical seal adapted to be undone by sliding the piston upwards on the rod on a height such that the tight stop edge comes in tight contact of the stop surface before contact cylindrical seal is not released, to create a precompression.

The combination of a cylindrical sealing contact having a certain height and a stopping surface of engagement on which the cuff rises during its sliding upward under pressure prevailing in the pump chamber provides a precompression.

In order to improve the cylindrical sealing contact, it is expected that the actuating rod includes means for radially compressing the lower end of the cuff.

According to one embodiment, the actuating rod is provided at its lower end with a member compression device for compressing the lower end of the cuff between the rod and said peripheral organ.

Advantageously, the peripheral compression member has a cylindrical surface concentric with the rod, thus together defining a receiving groove by tight wedge for the lower end of the cuff, connecting the inside of the upper actuation with the pump chamber.

So the height of the cylindrical surface concentric of the peripheral compression organ determines the dead stroke height during which the cuff remains in sealing contact with this surface concentric cylindrical and thus closes the valve exit.

According to another characteristic of the invention, the piston includes a peripheral shoulder located at a intermediate level between the upper end and the lower end of the cuff, said shoulder being in abutment against a fixed element of the pump when the rod is in the rest position so that the cuff is not in compression at rest.

According to another aspect of the invention, the cuff of the piston includes an outer sealing bead device adapted to slide tightly against an internal cylindrical wall from the rest position until near the depressed position where the cord leaves said wall to allow ventilation only at the end of the race.

The invention will now be described more fully in reference to the accompanying drawings giving by way of example no limiting an embodiment of the present invention.

In the drawings:

  • Figure 1 is a cross-sectional view through a manual pump according to the invention;
  • FIG. 2 is a representation on an enlarged scale of FIG. 1.

Referring now to Figure 1, the pump according to the invention comprises a pump body 1 in the form substantially cylindrical having at its end lower a fixing sleeve 14 for a dip tube (not shown). The pump body also defines just above the fixing sleeve 14 a seat of inlet valve 13 in the form of an internal wall truncated. As a valve member, we can by example use a steel ball 5 as shown in Figure 1, but other plastic valve members for example can also be used for this purpose. Above the valve seat 13, the pump body widens to form a cylindrical section 12. In reality, this cylindrical section 12 is not perfectly circular, but polygonal so that internal walls of this section 12 are formed by flat sections. This guarantees good spring guidance biconical 6 which is housed therein and which often tends to deform when energized. The skirts thus serve as guide walls to maintain the spring 6 perfectly straight. On the other hand, the shape biconical of the lower end of the spring allows confine the ball 5 of the valve in a limited space. Above of this cylindrical section 12, the pump body forms a shoulder 125 outward to define a other part of cylindrical body 11. This part of cylindrical body 11 defines an internal surface serving waterproof sliding wall as will be seen below. This cylindrical body part is also pierced a vent hole 15 which is used to vent the bottle as will be seen below. The cylindrical body part ends with a thickened upper end 10 which defines the upper opening of the pump body and a overall support reference.

The pump further includes an actuating rod designated as a whole by the reference numeral 2 in Figure 1. This actuating rod 2 comprises two constituent elements interconnected, namely a rod hollow 20 and a peripheral compression member 24. The hollow rod 20 and the peripheral compression member 24 are fixedly attached to each other but we can also imagine embodiments in which these two elements form a single piece. The rod hollow 20 defines an internal delivery duct 201 which extends across the entire length of the rod. The hollow rod 20 includes an upper part 21 intended to protrude from the pump body 1. At its upper end, the rod part 21 is capped a dispensing head 8 provided with a nozzle 81. At its lower end, the upper rod portion 21 is connected to a middle rod portion 22 of diameter superior. So there is defined an outer shoulder between the upper rod part 21 and the rod part median 22. At its lower end, the stem part middle 22 is connected to a rod portion 23 of diameter inferior. According to one embodiment of the invention, the passage of the middle part 22 of diameter greater than the lower part 23 of smaller diameter is produced by a frustoconical surface 223 whose function will be given below.

The peripheral compression member 24 connected to the hollow rod 20 is formed with a central pin 27 inserted into the internal conduit 201 of the hollow rod 20 over a height corresponding approximately to the middle part 22 and the lower part 23. The central pin is held inside the conduit 220 via of radial peripheral ribs 271 which are engaged with the inner wall of conduit 201. Between the ribs 271, a plurality of passages is defined which makes communicate the internal duct 201 with the end open from the lower part 23 of the rod 20. At its lower end, the central pin 27 forms a disc 25 whose outer diameter and substantially higher than that of the lower part 23 of the rod hollow 20. The disc 25 has an upper surface in which grooves 28 are formed which are formed in the extension of the fluid passages formed between the ribs 271 of the central spindle 27, as can see it in figure 2. So a communication is established between the lower end of the hollow rod 20 and its upper end. It should be noted that the rod hollow 20 communicates with the pump chamber not by transverse conduits, as is the case in art anterior but through an annular opening located in a horizontal plane, which has an advantage described below. According to the invention, the disc 25 is provided with a cylindrical peripheral sleeve 26 which projects towards the top from the top surface of the disc 25. Therefore, this cylindrical peripheral sleeve 26 defines a cylindrical surface 261 which is concentric to the lower part 23 of the hollow rod 20 on a certain height, as can be seen in Figure 2. The peripheral sleeve 26 therefore defines with the part lower part of the rod part 23 a housing of annular reception having a cross section rectangular. This reception accommodation communicates with the internal conduit 201 of the hollow rod 20 by through grooves 28 and formed passages between the ribs 271.

To urge the actuation rod 2 upwards outside the pump body 1, a spring is provided reminder 6 which is supported with its lower end against the shoulder formed by the pump body 1 just above the valve seat 13 and with its end upper against the underside of disc 25. To prevent ball 5 from being applied by an effect suction cup against spring 6, grooves 16 are formed in the pump body at the level where the spring 6 takes support, as can be seen in Figure 1. So there always has an open passage for the fluid, even when product suction from the tank. In addition, the underside of disc 25 is formed with a notch 250 thus avoiding any trapping of air in the cavity of reception formed by the disc 25 to accommodate the end upper of the biconical spring 6. To hold the rod actuation 2 inside the pump body 1, it is provided a ferrule 4 inserted in the pump body 1 and having an upper flange 41 which extends radially inward to define a central opening through which the part passes upper 21 of the hollow rod 20. The ferrule 4 is forcibly engaged in the pump body 1 and is there maintained for example by a harpoon effect. The ferrule 4 also defines an inner wall 43 perfectly cylindrical which serves as a sealed sliding surface as will be seen below.

According to the invention, a free piston designated by the reference numeral 3 is slidably mounted on the part lower 23 of the hollow rod 20. This piston 3 can be move in a limited way on this lower part 23 of the hollow rod 20 to fulfill an organ function of outlet valve. Piston 3 is formed with a cuff substantially cylindrical 30 which surrounds the part lower 23 of the hollow rod 20. This cuff 30 has an upper end 33 and an end lower 32. In addition, the piston 3 forms a lip outer seal 31 adapted to slide so tight against the internal wall of the pump body 1 in its upper part 11. More particularly, the piston 31 slides in this internal wall of the pump body 11 in a part which is located between shoulder 125 and the vent hole 15. According to a characteristic of the invention, the frictional forces generated between the sealing lip 31 and the inner wall of the body of pump 11 are greater than those generated between the cuff and the lower part 23 of the rod actuating. Advantageously, the internal diameter of the cuff is greater than the outer diameter of the rod actuation so there is virtually no friction at this level. This ensures that the forces of friction are much higher than the level of the sealing lip. This force differential of friction acts as a spring, in that it allows return the cuff to its rest position when return of the drive rod after distribution of the dose of product. In Figure 2, the space between the cuff and rod was deliberately depicted from exaggerated way: of course, it is essential that the cuff slides fluid tight on the upper so that there is no leakage at this level.

The sealing lip 31 is connected to the cuff 30 by forming a shoulder 34. When the pump is at rest, which corresponds to Figure 1, the end lower 32 of the cuff 30 is engaged in the receiving housing formed by the lower end of the lower part 23 of the rod 20 and the sleeve peripheral 26 of the peripheral compression member 24. The lower end of the cuff has a substantially equal or slightly smaller external diameter to the internal diameter of the wall 261 of the sleeve 26, while advantageously guaranteeing a cylindrical seal on the contact height. The compression point ensuring a permanent seal is located in 262 at level where the lower end 32 flares to form a frustoconical surface 263. Thus, as soon as the cuff is slightly moved upward from the rod, this compression point is broken and the cuff can slide freely, especially since its wall internal is not in frictional contact with the rod actuating. So the lower end 32 of the sleeve 30 is received in the housing of sleeve 26 in defining a cylindrical seal provided by a compression point 262. This therefore results in contact cylindrical sealing of a certain height. Through Therefore, the sealing contact that exists between the lower end 32 of the cuff and the sleeve 26 is only broken when the cuff has made a moving up a distance greater than the height of the sealing contact. As a result, the piston must perform a dead stroke on a certain distance before opening the fluid passage and allow its evacuation through the internal conduit 201 and the nozzle spray 81.

On the other hand, the cuff 30 extends with its upper end 33 to near the surface frustoconical 223 which forms the transition between the part middle 22 and the bottom 23 of the hollow stem 20. Consequently, as soon as the piston moves towards the high due to the increased pressure at inside the pump chamber, its end upper 33 will engage on this frustoconical surface 223. To allow engagement of the cuff 30 on this frustoconical surface 223, the upper end 33 is formed with an internal cylindrical recess 331 which allows the cuff to engage on the surface tapered 223 only after a certain stroke of the cuff. The upper end edge 332 of this offset 331 forms a tight stop edge against the frustoconical surface 223 at the point referenced 224. For allow the opening of the passage at the end bottom of actuating rod 2, the piston should made an upward race by engaging on the tapered surface 223 which is greater than the height of the cylindrical sealing contact formed by the end lower 32 of cuff 30 with inner surface peripheral 261 of the cuff 26. Preferably, the distance from edge 332 to point 224 is slightly less than the height of the cylindrical contact at the level from the lower end 32. In this way it is created precompression due to resistance to deformation of the edge 332 in contact with the surface tapered 223 at point 224. The tapered surface 224 therefore serves as a stop surface against which abuts the upper end edge 332 of the cuff for create a tight circular contact. Slight deformation of this edge also makes it possible to create a precompression. The step 331 is advantageous in that which prevents extensive contact between the cuff and the rod which generates friction forces considerable risk of blocking the cuff on the piston, as in the aforementioned art document prior. It is therefore important that the forces of friction are also minimized at this level.

The cuff 30 in the rest position such that shown in Figure 1 is also subject to no strain constraint which would be exerted in the axial direction of the pump. Indeed, in the rest position, the cuff bears with the shoulder 34 against the edge lower inner 42 of the ferrule 4. In this position, the upper end 33 of the cuff is not not engaged on the tapered surface 223 and the end lower 32 of the cuff is fully engaged in the receiving housing formed by the rod 23 and the sleeve 26 of the peripheral compression member 24. By therefore, in the rest position, the return spring 6 ensures perfect tightness of the top valve favoring the jamming of the lower part 32 of the cuff 30 and the abutment of the shoulder 34 against the ferrule 4.

According to another characteristic of the invention, the cuff 30 is provided near its end upper 33 of a peripheral sealing bead outside 330 which slides tightly against the inner wall 43 of the shell 4, as can be seen on Figure 2. This outer peripheral sealing bead 330 isolates the interior of the container from the atmosphere which would be attached to the pump. Indeed, as long as the cord seal 330 is in leaktight sliding contact against the inner wall 43 of the shell 4, there is no communication between inside and outside the container on which the pump would be mounted, through the vent hole 15. By cons, as soon as the cord seal 330 leaves this internal surface 43 of the ferrule 4, there is no more sealing and the outside air can enter the container through the vent hole 15. Advantageously, a groove 150 is formed in the pump body which connects the vent hole 15 to the section cylindrical 12 to prevent the vent hole from being blocked closed by the internal wall of the tank neck. We see clearly in Figure 1 that the sealing bead 330 does not leave the internal wall 43 of the shell 4 until the end of stroke, i.e. only when the lip seal 31 of piston 30 comes close to the shoulder 125 formed by the pump body 1. Thus, unlike the pumps of the prior art, the updating the open air is only at the end of the race so that the container is isolated from the outside during the major part of the piston stroke.

As a variant shown in FIG. 2, the wall internal 43 of the shell 4 may be provided with one or several grooves 430 which extend to the end of the ferrule. Consequently, the venting will be carried out as soon as the cord 330 arrives at the height of the grooves 430. In this way, the time of venting by adjusting the height of the bleedings. The higher the grooves from the lower end of the ferrule and the more the setting the open air will take place early. In addition, it is possible to adjust the airflow rate by adjusting the total cross section of the grooves. Thanks to these tapped, it is possible to precisely adjust the timing and flow rate of venting. Of course, we can easily consider instead of the a peripheral step which leads to a cylindrical section of larger diameter. The goal is to create a recess forming an air passage between the cord 330 and the inner wall 43 of the shell 4 to one determined location and determined flow.

It will now be quickly described a complete cycle for actuating the pump described above. In the position shown in Figure 1, the pump is in its rest position. The return spring 6 urges the actuation rod 2 upwards so that the shoulder 34 of the piston 3 is in abutment against the edge inner lower end of the ferrule 4. The lower end 32 of the cuff 30 is engaged with seal against the sleeve 26 of the member compression device 24. The upper end 33 of the cuff is not engaged on the surface frustoconical 223 of the hollow rod 20. In this position, the interior of the pump chamber is perfectly insulated from the outside. The cuff is then not subject to any constraint exerted on its height. The only constraint closing the outlet valve is that exerted between the shoulder of the cuff in contact with the ferrule 4 and the point of contact 262 with the sleeve 26.

For example by pressing with a finger on the dispensing head 8, the actuating rod is pushed in 2 in the pump body 1. In an initial phase of the lowering of the rod, the shoulder 34 of the piston 3 leaves its abutment contact with the lower edge 42 of the shell 4, since the latter is an element pump fixed. The descent of the actuating rod 2 in the pump chamber causes a decrease in volume of the latter, which urges the piston 3 towards the sliding top on the lower part 23 of the rod hollow 20. Thus, as the actuating rod 2 sinks into the pump body 1, the piston 3 rises on the actuating rod. Dynamically, strength generated by the pressure in the pump chamber is greater than the friction forces at the lip of the piston. The rise of the piston on the rod drives the engagement of the upper end 33 of the cuff 30 on the frustoconical surface 223 and the disengagement of the lower end 32 of the sleeve 30 of the housing reception defined by the sleeve 26. The displacement of the piston 3 upwards on rod 23 continues until that the lower end 32 of the cuff 30 is completely disengaged from the receiving housing, so that there is no longer any sealing contact between the cuff and sleeve 26. Edge 332 and then slightly crushed against the frustoconical surface 223 at contact point 224. At this point, the passage is open between the interior of the pump chamber and the conduit internal 201 of the actuating rod through the grooves 28 and the passages defined between the ribs 271. The pressurized fluid in the pump chamber can therefore escape through the actuating rod and reach the nozzle 81 where it is sprayed fine droplets. When the sinking of the rod actuation 2 is complete, the sealing lip 31 of the piston is in abutment against the shoulder 125 formed by the pump body 1. The metering chamber is at this time completely evacuated and there is no more pressure to inside. The piston 3 is then no longer stressed, but there remains a short time in place due to the forces of friction at the pump body. However, the rod 2 rises under the action of spring 6 as the user releases the pressure on the head 8. The displacement of the rod relative to the still fixed piston a to disengage the edge 332 of the piston of the tapered surface 223. Under the effect of the forces of friction, the piston returns to its rest position where the lower end 32 of the cuff returns in cylindrical sealing contact inside the housing reception defined by the sleeve 26. When the rod actuation 2 returns to its rest position under the effect of the return spring 6, the shoulder 34 of the piston 3 comes into abutment against the inner lower edge 42 of the ferrule 4 which contributes to the depression of the lower end 32 of the cuff in the housing defined by the sleeve 26. We then returned to the position shown in Figure 1, which ends the actuation cycle.

Regarding the venting, the cord outer seal 330 of the sleeve 30, during the depression of the rod 2 is in sliding contact watertight with the inner wall 43 of the shell 4. This only when the sealing lip 31 of the piston 3 abuts against the shoulder 125 of the pump body 1 that the sealing bead leaves the internal surface 43 of the ferrule, which allows outside air to enter in the container on which the pump would be mounted passing between the ferrule and the actuating rod then to through the vent hole 15.

Claims (9)

  1. A hand operated pump for fluid distribution comprising:
    a pump body (1) defining a pump chamber provided with an inlet valve (5),
    a hollow control rod (2) movable in said pump body (1) between a rest position and a depressed, lower position, said rod (2)being biased upwardly to said rest position by a return spring (6), said rod (2) comprising an inner outlet duct (20),
    a free floating piston (3) assembled in a sliding manner in said pump body (1) and on said rod (2),the piston (3) and the rod (2) cooperating to form an outlet valve for sealing the outlet lift duct in the rest position,
    the rod comprising a stop surface (223), said piston (3) cooperating with said surface during its upward sliding to provide a sealing at this level,
    said piston (3) comprises a sleeve (30) surrounding said control rod (2), said sleeve (30) having a lower end (32) in seal contact with said control rod (2) in said rest position to form the outlet valve and a upper end (33) adapted to cooperate with said stop surface (223) of said rod (2) during the upward sliding of the piston (3),
    said sleeve (30) having an inner diameter greater than the outer diameter of said rod (2),
    the upper end (33) of said sleeve defining an upper circular sealing stop ridge (332) adapted to engage the stop surface of the rod in said depressed position,
       characterized in that the outlet valve presents a cylindrical sealing contact adapted to be broken by upward sliding of said piston (3) on the rod (2) in such a height that the stop ridge (332) sealingly engages the stop surface (223) before the cylindrical sealing contact of the outlet valve is broken, thus providing a precompression.
  2. A pump according to claim 1, wherein the stop surface is frustoconically flared toward the exterior.
  3. A pump according to claim 2, wherein the sealing stop ridge (332) is defined by the upper end of an inner step (331).
  4. A pump according to claim 1, 2 or 3, in which said rod (2) comprises means (26) to radially compress the lower end (32) of said sleeve (30).
  5. A pump according to any preceding claim, in which said rod (2) has at its lower and a peripheral compression device (24, 26) allowing for the compressing of said lower end (32) of said sleeve (30) between said rod (2) and said peripheral device (24, 26).
  6. A pump according to claim 5, in which said peripheral compression device (24, 26) comprises a cylindrical surface (261) concentric to the rod, thus defining together a receiver groove with a seal clamping for the lower end of the collar, said receiver groove establishing communication between the inside of the control rod and the pump chamber.
  7. A pump according to any preceding claim, in which said piston (3) comprises a peripheral shoulder (34) located at an intermediate point between the upper end (33) and the lower end (32) of said sleeve (30), said shoulder being supported against a stationary element (4) of the pump when the rod (2) is in the rest position so that said sleeve (30) is not in compression at the lock point.
  8. A pump according to any preceding claim, in which said sleeve (30) comprises an outer peripheral cord seal (330) adapted to slide in a tight manner against an inner cylindrical section (43) from the rest position until about the lower position where the cord (330) abandons said section (43) so at to allow atmospheric venting only at the end of the stroke.
  9. A pump according to any preceding claim, in which the inner cylindrical section (43) is provided with at least a recess (430) allowing for passage of air between said cord (30) and inner cylindrical section (43) so as to accelerate the establishment of atmospheric venting.
EP98401668A 1997-07-04 1998-07-03 Manual pump with a free sleeve piston Expired - Lifetime EP0888824B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9708526 1997-07-04
FR9708526A FR2765638B1 (en) 1997-07-04 1997-07-04 Manual pump with free piston with cuff

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/346,821 US6209759B1 (en) 1997-07-04 1999-07-02 Hand-operated pump with a free floating sleeve piston
US09/760,038 US6471097B2 (en) 1997-07-04 2001-01-12 Hand-operated pump with a free floating sleeve piston

Publications (2)

Publication Number Publication Date
EP0888824A1 EP0888824A1 (en) 1999-01-07
EP0888824B1 true EP0888824B1 (en) 2003-02-19

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EP98401668A Expired - Lifetime EP0888824B1 (en) 1997-07-04 1998-07-03 Manual pump with a free sleeve piston

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EP (1) EP0888824B1 (en)
DE (1) DE69811431T2 (en)
ES (1) ES2192751T3 (en)
FR (1) FR2765638B1 (en)
TW (1) TW393428B (en)

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US6209759B1 (en) 1997-07-04 2001-04-03 Valois S.A. Hand-operated pump with a free floating sleeve piston
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CN105600112A (en) * 2015-10-28 2016-05-25 上虞市神龙铝塑制品有限公司 Multi-seal emulsion pump

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FR2719242B1 (en) * 1994-04-27 1996-07-12 Valois Sa Advanced precompression pump.
CA2440737C (en) * 1995-01-27 2010-08-24 Yoshino Kogyosho Co., Ltd. Liquid jet pump

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DE69811431T2 (en) 2004-01-15
FR2765638B1 (en) 2004-11-26
FR2765638A1 (en) 1999-01-08
TW393428B (en) 2000-06-11
ES2192751T3 (en) 2003-10-16
DE69811431D1 (en) 2003-03-27
EP0888824A1 (en) 1999-01-07

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