EP0623060B1 - Vordruckpumpe - Google Patents

Vordruckpumpe Download PDF

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Publication number
EP0623060B1
EP0623060B1 EP93904092A EP93904092A EP0623060B1 EP 0623060 B1 EP0623060 B1 EP 0623060B1 EP 93904092 A EP93904092 A EP 93904092A EP 93904092 A EP93904092 A EP 93904092A EP 0623060 B1 EP0623060 B1 EP 0623060B1
Authority
EP
European Patent Office
Prior art keywords
plunger
push rod
pump
lip
ram
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
EP93904092A
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English (en)
French (fr)
Other versions
EP0623060A1 (de
Inventor
Jean-Pierre Lina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aptar France SAS
Original Assignee
Valois SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valois SAS filed Critical Valois SAS
Publication of EP0623060A1 publication Critical patent/EP0623060A1/de
Application granted granted Critical
Publication of EP0623060B1 publication Critical patent/EP0623060B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B05B11/1023—Piston pumps having an outlet valve opened by deformation or displacement of the piston relative to its actuating stem
    • B05B11/1025—Piston pumps having an outlet valve opened by deformation or displacement of the piston relative to its actuating stem a spring urging the outlet valve in its closed position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1097—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle with means for sucking back the liquid or other fluent material in the nozzle after a dispensing stroke
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1043—Sealing or attachment arrangements between pump and container
    • B05B11/1046—Sealing or attachment arrangements between pump and container the pump chamber being arranged substantially coaxially to the neck of the container
    • B05B11/1047—Sealing or attachment arrangements between pump and container the pump chamber being arranged substantially coaxially to the neck of the container the pump being preassembled as an independent unit before being mounted on the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1073—Springs
    • B05B11/1074—Springs located outside pump chambers

Definitions

  • the present invention relates to an improved precompression pump, more particularly intended for spraying or dispensing a fluid product for example, such as a perfume, a cosmetic product or a pharmaceutical product.
  • a fluid product for example, such as a perfume, a cosmetic product or a pharmaceutical product.
  • Such a liquid or pasty pump is generally actuated using a finger.
  • a particular type of manual precompression pump is described in document FR-A-2 403 465.
  • This type of pump comprises a cylindrical pump body in which an annular piston slides, said piston being controlled by a push rod which slides in said piston and which comprises an outlet channel opening into the pump body through a lateral opening, the piston comprising a substantially axial annular lip which cooperates with the push rod to close or release said lateral opening, the push rod being connected to the piston by a first elastic means which pushes the piston towards a position where it closes said lateral opening, said elastic means urging said piston towards an annular gland which urges said lip radially towards the push rod, by wedge effect.
  • the present invention aims to solve this technical problem.
  • the present invention relates to a pump of the type described above, characterized in that the gland is further adapted to abut against the piston outside said lip, which limits the relative approximation between the gland and the piston and limits therefore the radial force applied to said lip of the piston.
  • the first end of the pump body may comprise an intake valve
  • the pump may include an intake valve and the pump also comprises a second elastic means which urges the push rod towards said second end of the pump body.
  • the gland may have an inner annular surface facing the central lip of the piston, flared by widening towards the second end of the pump body.
  • the central lip of the piston may comprise the central lip of the piston has an outer annular surface, facing the gland, which has an outer diameter increasing towards the second end of the pump body.
  • the gland may include a crown adapted to abut against the piston outside the central lip, said crown having radial cutouts.
  • the part of the push rod on which the central lip of the piston slides with sealing can be cylindrical.
  • this part of the push rod may include a peripheral relief projecting radially outwards in the vicinity of the lateral opening of the push rod, the central lip of the piston having a cylindrical inner surface facing said relief.
  • the piston may include reliefs on which said helical spring rests.
  • the piston may include at least one periphery sliding in sealed contact against a part of the push rod, between the lateral opening of said push rod and its outer end.
  • the pumps described here are generally made of molded plastic, the seals being generally made of elastomer and the springs of metal.
  • the pump shown in FIG. 1 comprises a hollow cylindrical pump body 1, having an axis of revolution 2.
  • the pump body 1 has an open upper end 1c and a lower throttle 1a extended downwards by an inlet duct 1b suitable for communicating with a reservoir of product to be dispensed (not shown), directly or through a dip tube (not shown).
  • the pump body further comprises a lower part of reduced internal diameter 1e, which extends from the lower constriction 1a in the direction of the open end 1c of the pump body, up to an internal shoulder 1d of said body.
  • the pump body 1 delimits a pump chamber 6 which normally contains product to be dispensed, and which communicates with the inlet duct 1b via an inlet valve, which may for example comprise a conical seat 16, formed in the pump body 1 between the lower constriction 1a and the inlet duct 1b, and a ball 15 adapted to be applied so tight on the conical seat 16 by closing the inlet duct 1b, when an overpressure is created in the pump chamber 6.
  • an inlet valve which may for example comprise a conical seat 16, formed in the pump body 1 between the lower constriction 1a and the inlet duct 1b, and a ball 15 adapted to be applied so tight on the conical seat 16 by closing the inlet duct 1b, when an overpressure is created in the pump chamber 6.
  • the ball 15 comes off from its seat 16 by opening the inlet duct 1b.
  • the ball 15 can be metallic.
  • the inlet valve could have any other known shape, without departing from the scope of the present invention as described in the claims.
  • the pump body 1 can for example be mounted on the neck of the product tank using a metal cup 10 set on the open upper end 1c of the pump body, said metal cup having a bottom 10a provided with a central opening 10b.
  • An annular flat seal 31 is disposed between the open end 1c of the pump body and the bottom 10a of the metal cup. It goes without saying that the pump body 1 could be fixed by any other known means to the reservoir, without departing from the scope of the present invention.
  • the piston 3 has an outer skirt 5, at least one periphery of which is in sealed contact with the pump body 1, and a conduit interior 3d axial, substantially cylindrical.
  • the skirt 5 of the piston extends towards the lower constriction 1a of the pump body, but it could possibly also extend towards the bottom 10a of the cup 10, so as to abut against the seal 31 when the pump is in a rest position.
  • the piston 3 further comprises an annular lower lip 4 which extends axially towards the constriction 1a of the pump body and which is arranged in the center of the piston 3, around the inner duct 3d.
  • a push rod 7 centered on the axis 2 slides in the piston 3.
  • the push rod 7 passes through the orifice 10b of the metal cup, and extends from a first end 7j inside the pump body up to 'at a second end 7f outside the pump body, which generally receives a pusher.
  • the push rod 7 has a collar 7d extended towards the lower constriction 1a of the pump body by a cylindrical part 7g, with an outside diameter substantially equal to the inside diameter of the pipe 3d of the piston; said cylindrical part 7g of the sliding rod with sealing in said 3d conduit. Between the collar 7d and the piston 3 is disposed a helical spring 34.
  • the push rod 7 is biased by the spring 34 towards the open end 1c of the pump body, and its stroke is limited upwards by the stop of the collar 7d against the flat seal 31 and the bottom 10a of the cup. At rest, the collar 7d of the push rod is therefore applied sealingly against the seal 31.
  • the push rod 7 is pierced with an axial blind channel 7a, which opens laterally through at least one orifice 7b.
  • the orifice 7b is covered by the conduit 3a of the piston when the pump is in a rest position, that is to say when no action is exerted on the push rod 7.
  • the 3d conduit could be in tight contact with the rod 7 over the entire height of said conduit.
  • the 3d pipe has two zones of reduced internal diameter 3b and 3c, located respectively above and below the orifice 7b when the pump is in its rest position, the zone 3c being formed inside the central lower lip 4, and the said zones 3b and 3c being in sealed contact with the rod 7.
  • An annular gland 8 having substantially the shape of a crown of revolution around the axis 2, is disposed under the central lower lip 4 of the piston and urged upwards by a helical spring 35, of stiffness less than the stiffness of the spring 34, which rests on the lower constriction 1a of the pump body.
  • the central lower lip 4 of the piston may comprise a frustoconical outer surface 4a, of outer diameter decreasing downwards, from a maximum diameter to a minimum diameter.
  • the piston 3 may have a flat annular face 3a, the normal of which is directed downward, extending radially between the central lower lip 4 and the skirt 5.
  • the gland 8 may comprise a cylindrical inner conduit 8a of diameter included between the maximum diameter and the minimum diameter of the frustoconical surface 4a, said cylindrical inner duct 8a being extended towards the piston 3 by a ring 8b of diameter greater than the maximum diameter of the frustoconical surface 4a.
  • the crown 8b advantageously comprises radial cutouts 8d, the utility of which will be seen later.
  • the gland 8 Between the cylindrical inner duct 8a and the crown 8b, the gland 8 has an annular shoulder provided with an inner edge 8c, preferably rounded so as not to have a sharp angle.
  • the inner edge 8c is applied against a periphery of the frustoconical outer surface 4a of the piston by the action of the spring 35.
  • the inner edge 8c exerts on the central lower lip 4 both an axial force directed towards the end 1c of the pump body, and a radial force directed towards the push rod 7, by wedge effect, under the action of the springs 34 and 35.
  • the crown 8b is in abutment against the annular face 3a of the piston, and exerts on the piston an axial force directed towards the end 1c of the pump body.
  • the gland 8 applies said central lower lip 4 of the piston elastically against the push rod 7, while pushing the piston 3 upwards.
  • the clamping effect of the gland 8 is limited by the stop of the crown 8b on the surface 3a of the piston: this tightening effect is thus controlled with great precision, which prevents jamming of the lip 4 or its deformation by creep.
  • the central lower lip 4 is located at a certain distance below the lateral orifice 7b of the push rod, so that the radial tightening force exerted on the lip 4 does not risk wedging said lip 4 in the orifice 7b by an extrusion phenomenon.
  • the orifice 7b is chamfered or enlarged at its outlet on the rod 7.
  • the enlarged part 7c of the orifice 7b can be produced by a relief of the mold in which the rod 7 is formed, while the orifice 7b itself can be produced by a spindle which penetrates into the mold during molding, so that the edges of the enlarged part 7c are sharp and free from any molding defect, while the edges of the orifice 7b itself even may have small molding defects due to the translation of the spindle during molding. As the lip 4 slides on the edges of the enlarged part 7c, these possible faults are not troublesome.
  • the push rod 7 can be produced as shown in FIG. 2a, in two parts.
  • the rod 7 has a first narrowed cylindrical part 60 which extends the cylindrical part 7g downwards.
  • the lateral orifice 7b opens into said part 60.
  • This part 60 itself extends downwards by a second narrower cylindrical part 61, then by a frustoconical narrowing 62, then by a short cylindrical part 63 which ends in a external relief 64 at the lower end of the rod 7.
  • a cylindrical annular ring 65 of external diameter equal to the diameter of the cylindrical part 7g, is fitted onto the parts 61, 62, 63, and snapped onto the relief 64.
  • the ring 65 has an outer upper edge 65a chamfered or rounded. In this variant, any possibility of poor quality molding is eliminated at the places where the piston 3 slides on the rod 7 and the ring 65, and in particular at the edge 65a.
  • the operation of the pump is as follows.
  • the pump chamber 6 generally contains product to be sprayed or dispensed. As the product it contains is incompressible, the piston 3 cannot descend into the pump chamber: only the push rod 7 therefore descends, compressing the spring 34 and possibly causing a slight rise of the piston 3 in the body pump.
  • the cutouts 8d also facilitate the evacuation of the air contained in the pump chamber, when priming the pump, by preventing this air from being trapped under the piston.
  • the piston 3 then descends into the pump body 1 as the volume of product contained in the pump chamber 6 decreases, by compressing the spring 35, until the gland 8 comes into abutment against the shoulder 1d, where the downward movement of the push rod 7 and the piston 3 ceases.
  • the gland 8 could abut against any part integral with the pump body 1, without departing from the scope of the present invention as described in the claims.
  • the force exerted by the gland 8 on the piston 3 can therefore be significant, but it is taken up both by the annular face 3a and the central lower lip 4, which limits the force taken up by the part frustoconical lower 4a, and therefore also limits the radial tightening force exerted on said central lower lip 4 towards the push rod 7.
  • the relative axial position of the gland 8 relative to the piston is precisely fixed by the stop of the crown 8b of the gland against the annular face 3a of the piston, so that the radial deformation of said frustoconical lower part 4a towards the push rod 7 is limited.
  • the pump body 1 is pierced with an air intake orifice 18, located in the vicinity of the upper end 1c of said pump body.
  • the collar 7d is no longer in contact with the seal 31, so that air can pass between the push rod 7 and the seal 31.
  • the pump could not include an air intake orifice 18, without thereby departing from the scope of the present invention as described in the claims.
  • FIGS. 4 and 5 show a second embodiment of the pump according to the invention.
  • the pump of FIGS. 4 and 5 is an improvement on the pump shown in FIG. 7b of European patent application EP-A-0 486 378.
  • the pump comprises a hollow cylindrical pump body 1, having an axis of revolution 2.
  • the pump body 1 extends between an open upper end 1c, and a lower throttle 1a which is extended by an inlet duct 1b adapted to communicate with a reservoir containing the product to be dispensed (not shown), directly or through a dip tube 1f.
  • the pump body 1 delimits a pump chamber 6 which normally contains product to be dispensed, and which communicates with the inlet duct 1b by means of an inlet valve.
  • the outlet valve can for example comprise a conical seat 16 and a ball 15 adapted to be applied in a sealed manner on the conical seat 16 by closing the inlet duct 1b, when an overpressure is created in the pump chamber 6.
  • the ball 15 comes off from its seat 16 by opening the inlet duct 1b.
  • the inlet valve could have any other known shape, without departing from the scope of the present invention as described in the claims.
  • the pump body 1 can be mounted on the neck of the product reservoir using a metal cup 10 crimped on the open upper end 1c of the pump body, said metal cup having a bottom 10a provided with 'a central opening 10b.
  • the metal cup 10 has at in addition to a widening 10c, and a flat annular seal 31b is disposed between the widening 10c and the neck of the reservoir.
  • the piston 3 has an outer skirt 5, at least one periphery of which is in sealed contact with the pump body 1, and a conduit interior 3d axial.
  • the piston 3 further comprises an annular lower lip 4 which extends axially towards the constriction 1a of the pump body and which is arranged in the center of the piston 3, around the inner duct 3d.
  • the pump comprises an axial push rod 40, centered on the axis 2, which passes through the orifice 10b of the metal cup.
  • the push rod 40 is formed in two parts, and comprises an outer sleeve 41 fixed to an inner core 42, by force fitting or by other means.
  • the outer sleeve 41 has a shape of revolution around the axis 2. It passes through the central orifice 10b of the metal cup 10, and extends outside the pump body 1, to an outer end or upper 41f, which can receive a pusher 43.
  • the pusher 43 allows both the actuation of the pump and the said product outlet. As shown in Figure 4, the pusher may have a side outlet, optionally provided with a spray nozzle 43a.
  • the pusher 43 could have any other known shape without departing from the scope of the present invention.
  • the sleeve 41 has an axial channel 41a which passes through it. From the outer end 41f, the sleeve 41 extends to the inside of the pump body, to a collar 41c which extends substantially radially outward.
  • the sleeve 41 may be provided with a cylindrical skirt 41d, which extends towards the lower constriction 1a of the pump body from the collar 41c.
  • the cylindrical skirt 41d has an outer diameter smaller than the diameter of the collar 41c, and an inner diameter greater than the outer diameter of the inner core 42.
  • the inner core 42 has a first cylindrical part 42c which extends from an upper end 42f in the direction of the lower constriction 1a of the pump body.
  • the upper end 42f is fitted into the sleeve 41.
  • Said first cylindrical part 42 c of the core 42 extends towards the lower constriction 1a of the pump body by a second cylindrical part 42d of greater diameter.
  • the core 42 is pierced with an axial blind channel 42a which communicates with the channel 41 a of the outer sleeve 41, and which opens laterally, through at least one orifice 42b formed in the first cylindrical part 42c, in the vicinity of the second cylindrical part 42d.
  • the inner lip central 4 of the piston is cylindrical, and has a cylindrical internal surface 4b having an internal diameter substantially equal to the external diameter of the second cylindrical part 42d of the core 42.
  • the piston 3 comprises a cylindrical part 45 which extends axially in the direction of the end 1c of the pump body, around the core 42.
  • Said cylindrical part 45 has an external diameter substantially equal to the internal diameter of the skirt 41d of the sleeve 41, so that said cylindrical part 45 slides with sealing inside the skirt 41d.
  • the cylindrical part 45 could advantageously be replaced by a frustoconical part which widens slightly upwards, so as to improve the seal.
  • said part 45 can be reinforced by ribs (not shown) which extend radially inwards. and which slide against the second cylindrical part 42c of the core 42.
  • the cylindrical part 45 and the skirt 41d thus define an annular suction chamber 46, arranged around the core 42, which communicates with the orifice 42b, because the piston 3 is not in leaktight contact with the first cylindrical part 42c of the core 42. The usefulness of this suction chamber will be seen below.
  • the core 42 is extended radially outwards by a widening 42e, which itself can extend towards the lower constriction 1a of the pump body by a skirt 42g.
  • the skirt 42g cooperates with axial ribs 1g, formed inside the pump body 1 and which extend over a certain distance from the lower constriction 1a of said body pump, to guide the core 42 in its movement inside the pump body.
  • the enlargement 42e of the core 42 comprises a crown 44, which extends axially from said enlargement 42 towards the piston 3.
  • this crown is interrupted by radial cutouts 44a, as shown in FIG. 5.
  • a precompression spring 47 is disposed between the collar 41c of the sleeve 41 and the piston 3, so as to push said piston 3 towards the crown 44.
  • the piston 3 has an annular surface 3a radial between the skirt 5 and the lip 4. Under the effect of the precompression spring 47, said annular surface 3a is applied against the crown 44.
  • the crown 44 has an internal surface 44b frustoconical, which widens in the direction of the upper end 1c of the pump body and which exerts a radial clamping force, by wedge effect, on the lip 4 when the ring 44 is in abutment against the surface 3a of the piston.
  • the seal of the contact between the lip 4 and the second cylindrical part 42d of the core 42 is reinforced, while the clamping force exerted by the crown 44 is precisely controlled by the abutment of said crown 44 against the surface 3a of the piston, which avoids irreversible deformations or jamming of the lip 4 of the piston.
  • the lower enlargement 42e of the core 42 is pierced with orifices 42h which facilitate the passage of the product during expulsion, but these orifices could be omitted without leaving the frame of the invention as described in the claims.
  • the pump comprises a return spring 48 disposed between the enlargement 42e of the core and the lower constriction 1a of the pump body.
  • the return spring 48 biases the core 42 and therefore the assembly of the push rod 40, towards the open end of the pump body.
  • the collar 41c of the sleeve 41 is applied in abutment against the bottom 10a of the metal cup 10.
  • An annular seal 31a is interposed between the collar 41c and the bottom 10a of the cup 10.
  • the piston 3 has slots or ribs 49 arranged substantially radially, on which the precompression spring 47 rests.
  • the precompression spring 47 is a helical spring, its end turns may be at rest included in a plane not perpendicular to the axis 2.
  • the spring 47 would tend to deform the piston, or at least the outer skirt 5 of the piston, by imposing on it a certain cant, that is to say a certain rotation around an axis perpendicular to the axis 2, and this all the more easily as the push rod 40 is formed in two parts fitted one inside the other.
  • the operation of the pump in FIG. 4 is as follows.
  • a user presses the plunger 43 he lowers the push rod 40 inside the pump body, which biases the piston 3 downwards, due to the precompression spring 47.
  • the volume of the chamber pump 6 therefore tends to decrease, so that there is an overpressure which presses the ball 15 against its seat 16, isolating the pump chamber 6.
  • the piston 3 cannot descend into the pump chamber: only the push rod 40 therefore descends, and possibly the piston 3 rises slightly in the pump body.
  • the return spring 48 is compressed, as is the precompression spring 47.
  • the value of the pressure prevailing in the pump chamber for which the product is expelled is determined by the thrust exerted by the spring 47 at the end of the sliding stroke of the lip 4 on the cylindrical part 42d, and this thrust is greater than the thrust exerted by the precompression spring 47 on the piston 3 at rest.
  • This is advantageous insofar as it is thus possible to slightly decrease the thrust at rest exerted by the spring 47 on the piston 3, which further tends to reduce the possible deformations imposed by the spring 47 on the piston 3.
  • the lateral orifice 42b of the core 42 is drilled in the first cylindrical part 42a of said core, on which the piston 3 slides without sealing.
  • the edges of the orifice 42b have slight molding defects, these do not interfere at all with the sliding of the piston 3 on the core 42.
  • the expulsion rate of the product is improved.
  • the volume of the suction chamber 46 increases, and as the piston 3 slides without sealing on the first cylindrical part 42c of the core 42, the suction chamber 46 communicates with the orifice 42b, so that the increase in volume of the suction chamber 46 produces suction in the axial channel 42a of the core 42, in the channel 41a of the sleeve 41, and in the outlet passage of the pusher 43.
  • the product contained in the pusher 43 does not drip or ooze outside of said pusher during storage of the device, particularly when the product has a pasty consistency.
  • the return spring 48 of the push rod 40 could be mounted outside the pump body, for example between a collar of the sleeve 41 and the bottom 10a of the cup 10.
  • Figures 7 and 8 show a variant of the pump of Figures 4 to 6.
  • the structure of the pump of Figures 7 and 8 is very similar to that of Figures 4 to 6, so that it will not be described again in detail here. It differs from the pump in FIGS. 4 to 6 by the fact that the enlargement 42e of the core 42 does not include an orifice 42h, and also by the fact that the enlarged lower part 42d of the core 42 is no longer cylindrical, but frustoconical, widening upwards. Thus, said part 42d of the core 42 forms an annular edge 50 projecting around the core 42.
  • the pump of Figure 9 has a structure very similar to that of Figure 7, and will therefore not be described again in detail here.
  • This pump differs from that of FIG. 7 in that it is intended to spray or distribute a single dose of product, initially contained in the pump chamber 6.
  • the pump in FIG. 9 does not have any air return orifice 18. It also does not include the re-aspiration chamber 46 of the pump of FIG. 7, in which case the piston 3 must slide with sealing on the core 42 of the rod 40. It will however be noted that the re-aspiration chamber 46 could possibly be maintained as in FIG. 7, although re-aspiration is of little interest in the present case.
  • the pump of figure 9 does not has no inlet valve 15, 16, or inlet duct 1b, but only a filling passage 60 in the bottom 1a of the pump body, closed by a ball or other equivalent means.

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Claims (11)

  1. Vordruck-Pumpe mit einem zylindrischen Pumpenkörper (1), in dem ein ringförmiger Kolben (3) gleitet, wobei der Kolben (3) von einem Drückerstab (7, 40) gesteuert wird, der im Kolben gleitet und der einen Ausgangskanal (7a; 41a, 42a) aufweist, der durch eine seitliche Öffnung (7b, 42b) in den Pumpenkörper (1) mündet, wobei der Kolben eine im wesentlichen axiale ringförmige Lippe (4) aufweist, die mit dem Drückerstab zusammenwirkt, um die seitliche Öffnung zu verschließen oder freizulegen, wobei der Drückerstab mit dem Kolben über ein erstes elastisches Mittel (34, 47) verbunden ist, das den Kolben in eine Position zurückstößt, in der er die seitliche Öffnung verschließt, wobei das erste elastische Mittel den Kolben zu einem ringförmigen Druckglied (8, 44) bewegt, das die Lippe (4) durch Keileffekt radial zum Drückerstab (7, 40) bewegt, dadurch gekennzeichnet, daß das Druckglied (8, 44) außerdem geeignet ist, um außerhalb der Lippe (4) gegen den Kolben (3) in Anschlag zu gelangen, was die relative Annäherung zwischen dem Druckglied (8, 44) und dem Kolben (3) begrenzt und somit die auf die Lippe (4) des Kolbens angelegte radiale Klemmkraft begrenzt.
  2. Vordruck-Pumpe, die mindestens aufweist:
    - einen zylindrischen Pumpenkörper (1), der sich zwischen einem ersten Ende (1a) und einem zweiten Ende (1c) erstreckt,
    - einen ringförmigen Kolben (3), der axial im Pumpenkörper (1) gleitet,
    - einen Drückerstab (40), der im Kolben (3) gleitet und das zweite Ende (1c) des Pumpenkörpers durchquert, wobei der Drückerstab sich axial zwischen einem ersten Ende (41f) außerhalb des Pumpenkörpers und einem zweiten Ende (42e) innerhalb des Pumpenkörpers erstreckt, wobei der Drückerstab einen einseitig offenen Kanal (41a, 42a) aufweist, der sich axial ausgehend von dem ersten Ende (41f) des Drückerstabs bis zu einer seitlichen Öffnung (42b) erstreckt, die im Inneren des Pumpenkörpers mündet, wobei der Kolben eine zentrale ringförmige Lippe (4) aufweist, die sich über eine bestimmte Strecke zum ersten Ende (1a) des Pumpenkörpers hin erstreckt, wobei die zentrale Lippe (4) in dichtem Kontakt zumindest auf einem Teil (42d) des Drückerstabs gleiten kann, der sich zwischen der seitlichen Öffnung (42b) und dem zweiten Ende (42e) des Drückerstabs befindet, wobei die zentrale Lippe (4) die seitliche Öffnung des Drückerstabs freilegen kann, wenn der Kolben (3) weit genug zum ersten Ende (41f) des Drückerstabs hin verschoben wird,
    dadurch gekennzeichnet, daß die Pumpe weiter aufweist:
    - ein fest mit dem Drückerstab (40) verbundenes ringförmiges Druckglied (44), das zwischen der seitlichen Öffnung (42b) des Drückerstabs und dem ersten Ende (1a) des Pumpenkörpers angeordnet ist,
    - ein erstes elastisches Mittel (47), das zwischen dem Drückerstab (40) und dem Kolben (3) angeordnet ist und den Kolben (3) zum Druckglied (44) bewegt, so daß die zentrale Lippe (4) des Kolbens gegen das Druckglied (44) angelegt wird, wobei das Druckglied (44) und die zentrale Lippe (4) derart geformt sind, daß das Druckglied durch Keilwirkung eine nach innen gerichtete radiale Klemmkraft auf die zentrale Lippe (4) ausübt,
    und das Druckglied (44) außerdem geeignet ist, um gegen den Kolben (3) außerhalb der zentralen Lippe (4) in Anschlag zu gelangen, was die relative Annäherung zwischen dem Druckglied (44) und dem Kolben (3) begrenzt und somit die radiale Klemmkraft begrenzt, die auf die zentrale Lippe des Kolbens ausgeübt wird.
  3. Pumpe nach Anspruch 2, dadurch gekennzeichnet, daß das erste Ende der Pumpe eine Einlaß-Ventilklappe (15, 16), und die Pumpe weiter ein zweites elastisches Mittel (48) aufweist, das den Drückerstab (40) zum zweiten Ende (1c) des Pumpenkörpers bewegt.
  4. Vordruck-Pumpe, die mindestens aufweist:
    - einen zylindrischen Pumpenkörper (1), der sich zwischen einem ersten Ende (1a), das mit einer Einlaß-Ventilklappe (15, 16) versehen ist, und einem zweiten Ende (1c) erstreckt,
    - einen ringförmigen Kolben (3), der axial im Pumpenkörper (1) gleitet,
    - einen Drückerstab (7), der im Kolben (3) gleitet und das zweite Ende (1c) des Pumpenkörpers durchquert, wobei der Drückerstab sich zwischen einem ersten Ende (7f) außerhalb des Pumpenkörpers und einem zweiten Ende (7j) innerhalb des Pumpenkörpers erstreckt, wobei der Drückerstab einen einseitig offenen Kanal (7a) aufweist, der sich axial ausgehend von dem äußeren Ende (7f) des Drückerstabs bis zu einer seitlichen Öffnung (7b) erstreckt, die im Inneren des Pumpenkörpers mündet, wobei der Kolben eine zentrale ringförmige Lippe (4) aufweist, die sich über eine bestimmte Strecke zum ersten Ende (1a) des Pumpenkörpers hin erstreckt, wobei die zentrale Lippe (4) in dichtem Kontakt zumindest auf einem Teil (42d) des Drückerstabs gleiten kann, der sich zwischen der seitlichen Öffnung (7b) und dem zweiten Ende (7j) des Drückerstabs befindet, wobei die zentrale Lippe (4) die seitliche Öffnung des Drückerstabs freilegen kann, wenn der Kolben (3) weit genug zum ersten Ende (7f) des Drückerstabs hin verschoben ist,
    - ein erstes elastisches Mittel (34), das zwischen dem Drückerstab und dem Kolben angeordnet ist, um den Kolben zum zweiten Ende (7j) des Drückerstabs zu bewegen,
    - ein ringförmiges Druckglied (8) zwischen dem Kolben (3) und dem ersten Ende (1a) des Pumpenkörpers, das gleitend im Pumpenkörper angeordnet und in Bezug auf den Drückerstab (40) axial beweglich ist,
    - ein zweites elastisches Mittel (35), das das Druckglied (8) zum zweiten Ende (1c) des Pumpenkörpers bewegt, indem es das Druckglied (8) gegen die zentrale Lippe (4) des Kolbens anlegt, wobei das Druckglied (8) und die zentrale Lippe (4) so geformt sind, daß das Druckglied durch Keilwirkung eine nach innen gerichtete radiale Klemmkraft auf die zentrale Lippe (4) ausübt und gleichzeitig die zentrale Lippe axial zum zweiten Ende (1c) des Pumpenkörpers bewegt,
    dadurch gekennzeichnet, daß das Druckglied (8) außerdem ausgebildet ist, um außerhalb der zentralen Lippe (4) gegen den Kolben (3) in Anschlag zu gelangen, was die relative Annäherung zwischen dem Druckglied (8) und dem Kolben (3) begrenzt und somit die radiale Klemmkraft begrenzt, die auf die zentrale Lippe (4) des Kolbens ausgeübt wird.
  5. Pumpe nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß das Druckglied (44) eine innere ringförmige Fläche (44a) vor der zentralen Lippe (4) des Kolbens aufweist, die sich ausweitet, indem sie sich zum zweiten Ende (1c) des Pumpenkörpers hin vergrößert.
  6. Pumpe nach einem beliebigen der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die zentrale Lippe (4) des Kolbens eine äußere ringförmige Fläche (4a) vor dem Druckglied (8) aufweist, deren Außendurchmesser in Richtung des zweiten Endes (1c) des Pumpenkörpers anwächst.
  7. Pumpe nach einem beliebigen der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß das Druckglied (8, 44) eine Krone (8b, 44) aufweist, die außerhalb der zentralen Lippe (4) gegen den Kolben (3) in Anschlag gelangt, und daß die Krone radiale Ausschnitte (8a, 44a) aufweist.
  8. Pumpe nach einem beliebigen der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß der Teil (7, 42d) des Drückerstabs, auf dem die zentrale Lippe (4) des Kolbens dicht gleitet, zylindrisch ist.
  9. Pumpe nach einem beliebigen der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß der Teil (7g, 42d) des Drückerstabs, auf dem die zentrale Lippe (4) des Kolbens dicht gleitet, ein Umfangsrelief (50) aufweist, das in der Nähe der seitlichen Öffnung (42b) des Drückerstabs (40) radial nach außen vorsteht, und daß die zentrale Lippe (4) des Kolbens eine innere zylindrische Fläche (4b) vor diesem Relief (50) aufweist.
  10. Pumpe nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das erste elastische Mittel (47) eine Spiralfeder ist und daß der Kolben (3) Reliefs (49) aufweist, auf denen die Spiralfeder (47) aufliegt.
  11. Pumpe nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Kolben mindestens einen Umfang (3b, 45) aufweist, der in dichtem Kontakt gegen einen Teil (7, 41d) des Drückerstabs zwischen der seitlichen Öffnung (7b, 42b) des Drückerstabs und seinem äußeren Ende (7f, 41f) gleitet.
EP93904092A 1992-01-20 1993-01-19 Vordruckpumpe Expired - Lifetime EP0623060B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9200559A FR2686377B1 (fr) 1992-01-20 1992-01-20 Pompe a precompression perfectionnee.
FR9200559 1992-01-20
PCT/FR1993/000046 WO1993013873A1 (fr) 1992-01-20 1993-01-19 Pompe a precompression perfectionnee

Publications (2)

Publication Number Publication Date
EP0623060A1 EP0623060A1 (de) 1994-11-09
EP0623060B1 true EP0623060B1 (de) 1995-08-23

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EP93904092A Expired - Lifetime EP0623060B1 (de) 1992-01-20 1993-01-19 Vordruckpumpe

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US (1) US5482188A (de)
EP (1) EP0623060B1 (de)
JP (1) JP3265347B2 (de)
DE (1) DE69300399T2 (de)
FR (1) FR2686377B1 (de)
WO (1) WO1993013873A1 (de)

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Also Published As

Publication number Publication date
US5482188A (en) 1996-01-09
WO1993013873A1 (fr) 1993-07-22
DE69300399T2 (de) 1996-04-18
DE69300399D1 (de) 1995-09-28
FR2686377A1 (fr) 1993-07-23
EP0623060A1 (de) 1994-11-09
JPH07503927A (ja) 1995-04-27
FR2686377B1 (fr) 1994-03-25
JP3265347B2 (ja) 2002-03-11

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