Abstract:
A dispenser for fluid to pasty masses has a pump chamber that has an outlet valve. The pump chamber consists of an upper pump chamber part and a lower pump chamber part, which can be moved, relative to one another, for a pumping process. In order to prevent unintentional exit of mass under certain stresses such as severe vibrations, the outlet valve is moved into a release position before the beginning of a pumping process, by means of a control part.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    Applicant claims priority under 35 U.S.C. §119 of German Application No. 10 2008 024 181.4 filed May 19, 2008. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The invention comprises a dispenser for fluid to pasty masses, having a pump chamber with an outlet valve. The pump chamber consists of an upper pump chamber part and a lower pump chamber part, which can be moved, relative to one another, for a pumping process. 
         [0004]    2. The Prior Art 
         [0005]    Such dispensers have already become known in multiple configurations. As an example, reference is made to European Patent No. EP 0 520 315 A1. 
         [0006]    In the case of the known dispenser, an undesirable exit of mass sometimes occurs as the result of a movement of the pump chamber parts relative to one another, triggered by a severe vibration or the like. It is true that transport locking devices are already known in this regard, but in the case of these devices, a corresponding adjustment of the dispenser must be made. 
       SUMMARY OF THE INVENTION 
       [0007]    It is therefore an object of the invention to provide a dispenser in such a manner that no undesirable exit of mass occurs, at least under certain stresses, such as severe vibrations. 
         [0008]    This object is accomplished, according to one embodiment of the invention, by means of a dispenser having a pump chamber with an outlet valve that is moved into a release position before the beginning of a pumping process, by a control part. In other words, the outlet valve is not displaced by the mass itself, as is usual, but rather must first be actively displaced into a release position. This displacement into the release position must take place prior to every pumping process. This means, at the same time, that otherwise, after the pumping process has ended, the outlet valve is in a locked position. A compulsory sequence of carrying out a pumping process results from this, in that the outlet valve must first be displaced into a release position, by way of a separate procedure, at the beginning of the pumping process. Severe vibration of the dispenser as a whole, or only slight contact with the part of the dispenser that must fundamentally be activated to carry out a pumping process, does not yet lead to an exit of mass. 
         [0009]    It is particularly preferred that an activation part is provided to act on the upper pump chamber part, and that the control part is connected with the activation part. In this way, action on the activation part brings about an effect on the outlet valve, at the same time—and also at first, before the pumping process is carried out. No separate activation process is required. This leading effect on the outlet valve does not even have to become evident to the user. 
         [0010]    Furthermore, the activation part can be a dispenser head part. For use, the dispenser head part is pressed down, and in this connection, movement of the outlet valve into the release position is preferably brought about first, followed by the pumping process, i.e. dispensing of the mass from a dispensing opening of the dispenser. 
         [0011]    It is particularly preferred if the control part is configured as a mandrel connected with the activation part. In this way, the activation force can be transferred to the outlet valve in a simple manner, particularly if, as preferred, the mandrel extends vertically. Also, a space-saving configuration is achieved. It is also preferred if the control part does not yet act on the outlet valve during the first movement of the activation valve, but rather an idle stroke precedes this. This is achieved, for example, by means of a distance dimension between the top of the mandrel, for example, and the outlet valve. 
         [0012]    It is further preferred that the outlet valve can be disposed in the upper pump chamber part, which is preferably configured to be movable, with regard to a lower pump chamber part, which is preferably configured to be fixed. Thus, the outlet valve is directly assigned to the dispenser head part, and this is accordingly advantageous if this part is configured as the activation part, at the same time. 
         [0013]    The upper pump chamber part can furthermore be displaceable in the reverse direction, by means of the control part. This is advantageous if a reset spring, which is preferably provided in the dispenser, in order to move the pump chamber parts back apart from one another after they have been brought together, acts not on the upper pump chamber part, but rather on the dispenser part that has the control part, i.e., on the dispenser head part, for example. In this way, retraction of the upper pump chamber part can be brought about after the chamber parts have been brought together to carry out a pumping movement, by means of the control part, which can be tension-coupled with the upper pump chamber part in this regard. 
         [0014]    In a further detail, the outlet valve is preferably configured so that it is pressed into its closure position, by means of the mass situated in the pump chamber, under pressure, without displacement into the outlet position in the case of movement of the pump chamber parts toward one another. In other words, not only does it close the pump chamber as long as it is not turned on, but also, a pressure that builds up in the chamber, for example due to severe vibrations, simultaneously increases the closure effect of the outlet valve. 
         [0015]    In a further detail, the outlet valve has a valve plate and a valve shaft. The valve shaft is disposed to face away from the valve plate, in the dispensing direction. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]    Other objects and features of the present invention will become apparent from the following detailed description considered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention. 
           [0017]    In the drawings, wherein similar reference characters denote similar elements throughout the several views: 
           [0018]      FIG. 1  shows a cross-section through a dispenser head set onto a tube part, covered by a protective cap, in the non-activated position; 
           [0019]      FIG. 2  shows a representation according to  FIG. 1 , without a protective cap, in the activated position; and 
           [0020]      FIG. 3  shows a representation according to  FIG. 1  and  FIG. 2 , respectively, showing the reverse stroke movement. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0021]    With reference to  FIG. 1 , a dispenser  1  is shown and described, which is provided for dispensing materials that range from fluids to pasty masses, for example creams of a cosmetic type or toothpaste. 
         [0022]    Dispenser  1  has a dispenser head  2 , which is covered by a protective cap  3  in the representation in  FIG. 1 . Protective cap  3  is held on dispenser head  2  with a catch formed by catch beads  5  formed on lower dispenser head part  4 . 
         [0023]    Lower dispenser head part  4  simultaneously forms lower pump chamber part  6 , which consists of a cylinder section that is open toward the top. The cylinder section has overlap projections  7 , which limit the reverse stroke movement of upper pump chamber part  8 , as will be explained below. 
         [0024]    A reset spring in the form of a spring bellows  9  is disposed on the outside of lower pump chamber part  6 . Spring bellows  9  rests against the lower pump chamber part on the outside, with a foot region  10 . On the top, it supports itself on an underside of a dispenser head part  11 . 
         [0025]    Dispenser head part  11  is guided on the inside of a guide section  12  configured on lower dispenser head part  4 , concentric to lower pump chamber part  6 . Guide section  12  has projections  13  that project toward the inside, in order to limit movement, in fundamentally the same manner as lower pump chamber part  6 , which projections can also be formed as a circumferential edge. 
         [0026]    A dispensing tubule  14 , which empties into a dispensing opening  15 , is configured in dispenser head part  11 . This opening is directed sideways. 
         [0027]    Dispenser head part  11  furthermore has a cylindrical guide section  16  on the inside, also on the inside relative to the upper region of pump bellows  9 , in which upper pump chamber part  17  is guided. 
         [0028]    Upper pump chamber part  17  is composed, in detail, of a piston part  18 , an accommodation part  19 , and outlet valve  20  held between piston part  18  and accommodation part  19 . 
         [0029]    The piston part  18  has a piston section  21  on its underside, which is disposed on the inside of the cylinder section of lower pump chamber part  6 , in a telescoping manner. 
         [0030]    An inlet valve  22  is disposed in lower dispenser head part  4 , which valve is held to catch in lower dispenser head part  4  by means of a holder part  23 . 
         [0031]    Both inlet valve  22  and outlet valve  20  consist of a soft plastic. In this connection, a valve plate  24  is provided in inlet valve  22 , which plate lifts off from valve counter-surface  26  formed by the catch part, at a partial vacuum, i.e. during a reverse stroke movement of the upper pump chamber part  8  ( FIG. 3 ) in pump chamber  25 , and allows mass to enter from the supply chamber  27  into the pump chamber. Valve plate  24  is connected with an assembly section  28  of inlet valve  22 , by way of connection arms not shown in any detail. 
         [0032]    Outlet valve  20  also has a cylindrical assembly section  29 , which is disposed on the inside of accommodation part  19 . It is simultaneously overlapped at the bottom and on the inside by piston part  18 . 
         [0033]    Passageways  32  for the mass are provided in assembly section  29 , which makes a transition into a valve plate  31  by way of a narrowing section  30 . In the exemplary embodiment, passageways  32  are provided in the narrowing section  30 . Valve plate  31  lies against accommodation part  19 , by means of an upper edge  33 , forming a seal. By means of valve plate  31  formed onto valve shaft  34 , it projects into an upper, narrowed cylinder section of accommodation part  19 . 
         [0034]    Furthermore, a mandrel  35  directed downward is formed on dispenser head part  11 , on the inside, which mandrel aligns with valve shaft  34 . In the non-activated position according to  FIG. 1 , mandrel  35  is disposed at a vertical distance, with regard to its free end, from the upper free end of valve shaft  34 . This results in a corresponding path when dispenser head part  11  is pressed down, to which no action on outlet valve  20  is assigned as yet. 
         [0035]    Mandrel  35  possesses a bead-like thickened region  36  on its underside, which prevents it from being pulled out of passage bore  37  in accommodation part  19 , through which mandrel  35  extends. At the same time, this allows retraction of the upper pump chamber part after it has been pressed down, as will be described further below. 
         [0036]    When the dispenser is activated by pressing down on dispenser head part  11 , dispenser head part  11  first moves down, while pump bellows  9  relaxes, until the face surface of mandrel  35  makes contact with the facing face surface of valve shaft  34 . If the stroke is continued, dispenser head part  11  presses the outlet valve down, by means of mandrel  35  and valve shaft  34 , in such a manner that valve plate  31  releases a passage from pump chamber  25  into dispensing tubule  14 . Pressing the outlet valve down is limited by a stop position of guide section  16  on an outer shoulder  38  of accommodation part  19  assigned for this purpose, see  FIG. 2 . Once the aforementioned stop has been reached, a reduction in size of pump chamber  25  takes place during the further process, when dispenser head part  11  is pressed down further, and this is accompanied by dispensing of mass from pump chamber  25 , through dispensing tubule  14  and opening  15 . 
         [0037]    When the activation pressure is taken off dispenser head part  11 , dispenser head part  11  moves back in the direction of its starting position according to  FIG. 1 , as the result of the spring effect of pump bellows  9 . Such a state is shown in  FIG. 3 . In this connection, dragging the upper pump chamber part back into the starting position according to  FIG. 1  is connected with this movement, because of the coupling of mandrel  35  with accommodation part  19 . The reverse stroke is limited by contact of upper pump chamber part  17 , i.e. piston part  18 , in the concrete case piston section  21 , on overlap projection  7 , i.e. the stroke limitation by projection  13  that acts on upper dispenser part  11 . 
         [0038]    The disclosure content of the related priority application DE 10 2008 024 181.4 is hereby incorporated by reference into the disclosure of this application. 
         [0039]    Accordingly, while only a few embodiments of the present invention have been shown and described, it is obvious that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention. 
       REFERENCE SYMBOL LIST 
       [0000]    
       
           1  dispenser 
           2  dispenser head 
           3  protective cap 
           4  lower dispenser head part 
           5  catch beads 
           6  lower pump chamber part 
           7  overlap projections 
           8  upper pump chamber part 
           9  spring bellows 
           10  foot region 
           11  dispenser head part 
           12  guide section 
           13  projections 
           14  dispensing tubule 
           15  dispensing opening 
           16  guide section 
           17  upper pump chamber part 
           18  piston part 
           19  accommodation part 
           20  outlet valve 
           21  piston section 
           22  inlet valve 
           23  holder part 
           24  valve plate 
           25  pump chamber 
           26  valve counter-surface 
           27  supply chamber 
           28  assembly section 
           29  assembly section 
           30  narrowing section 
           31  valve plate 
           32  passageways 
           33  upper edge 
           34  valve shaft 
           35  mandrel 
           36  thickened region 
           37  passage bore