Media dispenser

A dispenser (1,1a) provides for filling a dosing chamber (15,15a) by gravity and then emptying it by closing an inlet valve (39,39a), by opening an outlet valve (40,40a) and by shortening the dosing chamber (15,15a) with the assistance of air flow through a discharge port (7,7a) and into a cup (80) which in one embodiment is assembled as part of the dispenser (1a) and which is removable so that its medium contents can be dispensed. Such a dispenser (1,1a) achieves a highly accurate dosing with simple handling and construction.

TECHNICAL FIELD AND BACKGROUND OF THE INVENTION 
The invention relates to a discharge device for a single medium or multiple 
media, each of which may be powdery, liquid, pasty, gaseous or the like 
and provided, more particularly, for pharmaceutical, cosmetic or similar 
applications. The dispenser is held single handedly and thereby actuated 
by the fingers of one hand for discharge. The dispenser is made totally of 
plastic material or injection molded parts so that the media do not come 
into contact with any metal parts. The dispenser is designed for assembly 
to one or more medium reservoirs or may be formed with this reservoir 
means as a unit which is separable only by destruction. 
Two or more slidable or flowable media may be conveyed or discharged by the 
dispenser during a single discharge event or simultaneously with the media 
being mixed either inside of, or outside of, the device. As a first 
medium, a non-gaseous medium is provided and, as a second medium, a highly 
volatile medium, particularly gas or air, is provided, which has a neutral 
chemical behavior relative to the first medium and particularly promotes 
its flow. Each medium may be separated from a reservoir prior to discharge 
in a dosed amount and then discharged. Repeated discharge events are 
possible by returning the dispenser to its initial position after 
discharge. The reservoir and the dosing chamber may form a single space 
which is intended exclusively for emptying so that the dispenser can only 
expel one single dose. The respective medium chamber can be varied in 
volume as a pressure chamber to propel the medium out of the chamber to 
the medium outlet. The stored or dosed amount of medium may also be 
contained in a capsule to be inserted in the dispenser. 
OBJECTS OF THE INVENTION 
An object of the invention is to provide a dispenser obviating the 
drawbacks of the prior constructions or achieving advantages of the 
dispenser to be described herein. Further, a simple design, for easy 
handling and precise dosing is desired. 
SUMMARY OF THE INVENTION 
According to the invention, medium spaces are provided for conveying the 
medium from at least one medium space to another by gravitation, and more 
particularly, either partly or completely by its own gravity. The medium 
thus falling by gravity from one space into the other can be delivered 
gently, which is expedient with powders or media having similar flow or 
trickling properties and causes loosening or mixing. Such adjoining medium 
spaces are provided from the reservoir or the medium chamber up to the 
medium outlet located within the dispenser or directly connecting to the 
exterior. They may be chambers, openings, passages or the like which 
receive the media stream prior to or during discharge and are wide enough 
to permit the medium's sinking motion without obstruction due to friction 
or capillary effect. 
The dispenser may be oriented in a resting or keeping position, such as a 
standing position, which relative to a vertical line passing through it 
departs from the conveying or dispensing position. The dispenser also 
permits one to convey the medium by gravity counter to the flow direction 
of the discharge, namely from the medium outlet back into the medium 
chamber or reservoir when the device is correspondingly oriented relative 
to the vertical, for instance, in the resting position. 
The chamber defining the dosage amount comprises boundary faces which are 
larger than those of an oblong chamber of the same volume having no core. 
To nevertheless have boundary faces which are relatively smooth or linear 
in axial section, the chamber has annular cross-sections. The chamber part 
defining the dose has a flow cross-section essentially smaller than the 
inflow cross-section directly adjoining the chamber or the outflow 
cross-section which is smaller than the inflow cross-section. The inflow 
cross-section may be at least four or six times larger than this flow 
cross-section or at least 1.5 to two times larger than the outflow 
cross-section which in turn may be at least two or three times larger than 
the flow cross-section. An outlet duct directly adjoining the outflow 
cross-section has a flow cross-section again essentially larger than all 
of the cited cross-sections. This duct cross-section is at least 1.5 times 
larger than the inflow cross-section or larger than the sum of all three 
cross-sections aforementioned. The duct cross-section like the inflow 
cross-section is continuously constricted during discharge, however, 
whilst the outflow cross-section is continuously widened. The constriction 
serves for closing the inflow cross-section or the widening for opening 
the outflow cross-section from a closed state. The constriction of the 
flow cross-section of the outlet duct or the continuous shortening thereof 
serves to accelerate discharge by reducing the size of the associated 
medium space, namely of the outlet duct and to ensure the outlet duct 
being totally emptied. 
Within the medium chamber a core body separate from the outer chamber 
bounds is provided which simultaneously opens and closes the two chamber 
openings and is movable relative to the medium outlet by a discharge 
actuator. Although the motions of individual components in discharge 
actuation may include a rotary motion, the exclusive use of an axial 
movement is preferred. The dosing or capacity volume of the medium chamber 
is variable so that it can assume varying values while being filled from 
the medium reservoir. In each volume setting, which may be incrementally 
or continuously varied, the medium chamber is locked by setting means with 
which the maximum actuating length of the discharge actuator is varied. 
The setting means are manually actuated with the handles used for 
discharge actuation. The setting actuation occurs transverse to or 
otherwise departs from the direction of discharge actuation. 
A reservoir or conveying unit for the second medium is located in the axis 
of the medium chamber or parallel thereto and may surround the latter at 
the outer circumference. A single wall bounds both reservoir or medium 
chambers with remote faces. 
The medium chamber is divided by a dividing means into two chamber parts at 
a spaced distance from, and between the inflow and outflow, namely into a 
prechamber adjoining the inflow opening and a dosage chamber adjoining the 
antechamber downstream. The contents of this dosing chamber are emptied on 
discharge through the medium outlet. These dividing means may be formed by 
a fluid flow of the second medium or the like which commences with the 
start of the discharge actuation, and prior to the inflow opening being 
totally closed, as well as being maintained up to complete emptying of the 
dosing chamber. Thereby, a conveying flow is introduced at the upstream 
end into the dosing chamber. This flow propels the medium downstream and 
up to the medium outlet so that all medium spaces extending from an input 
for the flow up to the medium outlet are flushed totally free of the first 
medium. 
All dispenser parts are provided between a flange for their supported 
connection to the medium reservoir and an end remote therefrom comprising 
the medium outlet to achieve compactness. The outlet duct can also 
function as a reservoir receiving one or more dosed volumes from the 
dosing chamber, whereafter it is emptied through the medium outlet. 
The dispenser conveys the medium from the reservoir into the medium chamber 
solely by being transferred into the inverted or discharged position and 
without additional manual stroke actuation. In the upright or standing 
position, the entire dose volume is returned from the medium chamber into 
the reservoir. By separate activation or manual actuation of a handle, the 
medium is then released from the medium chamber toward the medium outlet. 
Only then, the second medium is transferred into discharge flow. 
Other objects and advantages of the invention, besides those discussed 
above, will be apparent to those of ordinary skill in the art from the 
description of the preferred embodiments which follow. In the description, 
reference is made to the accompanying drawings, which form a part hereof, 
and which illustrate examples of the invention. Such examples, however, 
are not exhaustive of the various embodiments of the invention, and 
therefore, reference is made to the claims which follow the description 
for determining the scope of the invention.

DETAILED DESCRIPTION 
The dispenser 1 is fixed against axial and rotational displacement to the 
constricted neck of a flask-type integral reservoir 2 of glass, plastics 
material or the like and formed by two units 3, 4 movable axially relative 
to each other and freely rotational. Unit 3 is formed by a single or 
multi-part hollow base body 5, which in turn forms three axially adjoining 
or nested caps. One of the caps is a flange 6 for rigid connection to the 
reservoir neck and therefor has on the inner circumference thread or snap 
members or on the outer circumference a fastener, such as a crimp ring. At 
the end of dispenser 1 remote from flange 6 unit 4 has on its outer 
circumference and/or in the end face as a medium port 7 over a partial 
circumference of less than 180.degree. or 90.degree. a sole orifice, from 
which the medium is released from the dispenser 1 and which has a passage 
width of at least 10, 20 or 30 mm.sup.2. 
From port 7 the medium can be discharged directly into a receptacle, such 
as a drinking glass, a spoon or the like or orally administered. FIGS. 1 
and 2 show one of the dispensing or dispense positions which may also 
differ from each other and in which the port 7 is located below components 
2, 3, 5, 6. In the resting position which as compared to the inverted 
position is turned over 180.degree. the dispenser 1 can be placed to stand 
on a table surface with the bottom of reservoir 2 or with the then lower 
side of body 5, 6 with its axis 10 oriented vertical so that port 7 is 
then located in the upper portion at the top end of the dispenser 1. 
Units 3, 4 form by remote transverse faces a handle 8, 9 which can be 
gripped simultaneously by the fingers of one hand of the user and commonly 
with units 3, 4 mutually moved towards each other by finger pressure while 
shortening dispenser 1. Handle 8 spaced farther from port 7 may protrude 
at a spacing from reservoir 2 on both sides of axis 10 at the outer 
circumference of unit 3 and be formed by body 5 of the bottom portion (not 
shown) of reservoir 2 simultaneously forming the standing face thereof in 
the resting position. Handle 9 located more in front, namely more 
downwards in the operating position (FIG. 1) and more upwards in the 
resting position is located (FIG. 1) axially and/or radially upstream of 
port 7 as a depression or (FIG. 2) at the frontmost end of unit 4. Handle 
8 provides support for two fingers and handle 9 support for one finger of 
the same hand. During working stroke unit 4 is sunk in unit 3, but only so 
far that port 7 and handle 9 always remain outside unit 3. Substantially 
all components of dispenser 1 are designed symmetrical or rotationally 
symmetrical to center axis 10. Only the outlet portion and in case of 
design shown in FIG. 1 handle 9 or an inlet portion deviate from this 
condition. 
Between its ends or axially behind port 7 the dispenser 1 comprises three 
conveying units 11, to 13. Units 11, 12 adjoin each other axially and unit 
13 radially adjoins the rearmost of units 11, 12. Dispenser 1 and units 11 
to 13 form medium spaces, conveying paths or falling ducts, namely a 
transit port 14 for direct feed from reservoir 2, a chamber 15 directly 
adjoining port 14 for dosing, a transit port 16 directly adjoining chamber 
15 for outflow from chamber 15 and a medium space 17 directly adjoining 
chamber 15 and outlet 16. Space 17 is an outlet or falling duct or buffer 
reservoir and directly adjoins with its front end orifice 7 via a sloping 
flow path 18 for the medium. Spaces 14 to 16 belong to unit 11. Space 17 
forms a conveying or ejection chamber for the medium, the volume of which 
is variable by the discharge actuator. Chamber 17 acts as a pressure 
chamber of unit 12 but is not actually pressurized by volume reduction 
since orifice 7 is too large for this purpose and like duct 17 is always 
open or valve-free without cross-sectional changes. 
All spaces 14 to 17 are always coaxial to axis 10 from which each space 14 
to 17 is radially spaced away by being annular about axis 10. Spaces 14 to 
17 adjoining each other and thus merging as conveying paths have differing 
flow cross-sections and greatest and/or smallest radially spacings from 
axis 10. The largest like the smallest radial spacings of each space are 
formed by continuous outer bounds or annular faces, each of which has a 
constant radial spacing from axis 10 over its circumference. The largest 
but equal radial spacings of ports 14, 16 are smaller than the largest 
radial spacings of spaces 15, 17. The largest radial spacing of space 17 
is larger than that of space 15. The smallest radial spacing of space 14 
is smaller than that of all other spaces 15 to 17. The smallest radial 
spacing of space 15 is larger than that of space 17. Between the largest 
and smallest radial spacing the respective space 14 to 17 is free for 
medium flow all over its circumference. 
Totally within unit 4 and as a working member an actuating stem 19 or push 
rod is located axis 10. Stem 19 extends in one part always at least up to 
face 18 and into spaces 16, 15 and is non-rotationally and axially fixed 
to unit 4. Within spaces 14, 15 and flange 6, and also outside of space 
17, a core body 20 is located. Core body 20 controls medium flow through 
the conveying paths in opposing directions, directly adjoins these paths 
like stem 19, is reversibly and axially and rotationally movable relative 
to means 2 to 19 and is located totally within units 2, 3 without 
protruding axially beyond the corresponding unit 3 or 4. 
Over most of its length, stem 19 is formed by a tubular jacket 21 made in 
one part with face 18 forming the chambers 17 bottom opposing outlet 16. 
Ram 19, 21 or its shell is surrounded at the outer circumference radially 
spaced by a jacket 22 of unit 4. Port 7 passes shell 22 at a limited 
circumferential portion. At least over the full length of space 17 walls 
21, 22 have stable inner or outer cross-sections. The outer circumference 
of wall 21 forms the radially inner boundary of space 17 and the inner 
circumference of shell 22 forms the radially outer boundary thereof. Face 
18 directly and at an angle adjoins both bounds to directly seal them off 
so that in their vicinity the flow cross-section of duct 17 is reduced up 
to port 7. The rear end of shell 22 protrudes into an annular groove of 
unit 3, 5. At the outer circumference and at the bottom this groove is 
bounded by a cap 23 of unit 3, 5. Shell 22 and cap 23 or flange 6 form the 
outermost and circumferentially entirely freely exposed outer faces of 
device 1. These faces directly adjoin each other axially and are radially 
mutually offset. 
Second cap 23 formed by a component separate from or in one part with 
flange 6 has a jacket 24 freely protruding forwards, surrounding spaces 
15, 16 but only the rear end of space 17 and beyond the front free end of 
which unit 4 protrudes with shell 22. An annular spring 25 is located 
within wall 24 of body 23 and the rear end of shell 22. Coil compression 
spring 25 returns units 3, 4 on manual release of handles 8, 9 from the 
working end position indicated dot-dashed or any intermediate position 
back into the starting position (FIGS. 1, 2), thereby carrying also body 
20. Spring 25 is located between the ends of bodies 5, 20 or of chamber 15 
which like port 16 protrudes into the rear end of shell 22 or radially 
spacedly surrounds the rear end of shell 21 in axis 10. 
Face 18 and ram 19 are formed by a body separate from the remaining 
one-part unit 4, 22. This body is located totally within discharge socket 
22 with which it can be made in one part. This body has a jacket 26 firmly 
and frictionally engaging the inner circumference of shell 22. At its rear 
end shell 22 has an end wall 27 inclined to axis 10, adjoining shells 21, 
26 in one part and forming with its outer side face 18. Within and 
radially spaced from shell 26, shell 21 can extend over the inner side of 
wall 27 similar to shell 26 up to an end wall 28 of stud 22. The outer 
side of wall 28 made in one part with shell 22 forms handle 9 and from the 
inner wall side shells 21, 26 have a minor gap spacing so that the 
interior of shell 21 forms a conveying path up to port 7. 
Wall 29 of cap 23 directly adjoins the annular cap bottom of flange 6 and 
protrudes radially beyond the outer circumference of flange 6 to form 
handle 8. From the radially outermost zone of wall 29, shell 24 protrudes 
forwards only, whilst flange shell 6 protrudes only rearwardly over the 
outside of wall 29. Only over the inside of wall 29 and radially spaced 
within wall 24 a shell 70 of the third cap protrudes less far than shell 
24. Wall 70 is made in one part with flange 6 and a component separate 
from cap 23. With its rear end this component directly adjoins the flange 
bottom or with its outer circumference it directly adjoins wall 29. Walls 
24, 29, 70 may be made in one part. Located between the inner 
circumference of wall 24 and the outer circumference of wall 70 is the 
rear end of shell 22 which can with scraping action slide on both 
circumferences. From wall 29 up to its outer end shell 70 has constant 
outer or inner cross-sections over most of this length. The inner 
circumference of shell 70 forms the radial outer boundary of spaces 15, 
16. The outer circumference of body 20 forms the radially inner bounds of 
spaces 14, 15. Shell 21 forms the radially inner bounds of spaces 16, 17. 
In the vicinity of spaces 14 to 17, 7 control means 30 are effective for 
filling and emptying these spaces and the reservoir space 2 in opposite 
flow directions. The rear end of body 20 forms an acutely angled 
cone-shaped guiding face 31 inclined from axis 10 constantly throughout at 
an angle of 45.degree.. The end 32 of face 31 is offset forwardly relative 
to the tip and most remote from axis 10 while forming a projection with an 
edge 32 from which the medium detaches and is released for free fall while 
flowing towards opening 16. A depression 33 or annular groove adjoins edge 
32 in the forward direction. The rear flank thereof is oriented at right 
angles to axis 10 and forms the one flank of edge 32. The front flank 34 
is inclined by 45.degree. as a obtusely angled cone shaped guiding face 34 
and directly adjoins an outer jacket face 35 oriented parallel to axis 10. 
The front end of face 35 adjoins the bottom face of a depression 36 via a 
step-face forming the rear flank oriented at right angles to axis 10 and 
forwardly not bounded by any protruding flank. 
Of faces 31 to 36 it is the cylindrical face 35 that is axially longest and 
has a length about one half bigger than that of face 31. As compared to 
faces 31, 35 the cylindrical faces 33, 35 and the conical face 34 are 
essentially shorter since the length of faces 33, 36 is at the most a 
quarter or a fifth of the length of face 35 and maximally half or a third 
of the length of face 31. Face 34 is essentially shorter. Face 36 is 
slightly longer than face 33. The length of each of these faces 31 to 36 
is smaller than twice its average spacing from axis 10 so that body 20 
forming all faces 31 to 36 commonly in one part can be very short. The 
spacing of the face 35 from axis 10 is slightly smaller than that of edge 
32 and slightly larger than that of faces 33, 36. Face 36 extends up to 
the free end of body 20. 
The outer circumferential faces 31 to 36 form the innermost boundary over 
the full length of chamber 15 and are nearest to axis 10. The outer 
boundary 37 radially opposing boundaries 31 to 36 and farther from axis 10 
is formed over most of its length by the inner circumference of wall 70. 
Over a small rear longitudinal or end section boundary 37 is formed by a 
compressible, resilient and separate seal 38 located at the rear end of 
shell 17 within wall 29 and flange bottom 6 and forming with its inner 
circumference a smooth continuation of the cylindrical face 37. 
For alternately opening and closing ports 14, 16 or the ends of chamber 15 
formed thereby, control means 30 comprise two valves 39, 40 for which body 
20 forms one of the valve bodies and body 5 the other valve body, 
respectively. The movable valve bodies are located at the ends of, and 
made in one part with body 20, including the associated closing faces 41, 
42. The other valve bodies are located at the ends of shell 70 and made in 
one part with seal 38 or shell 70 including the associated closing faces 
43, 44. The annular seal 38 is of angular cross-section, one annular end 
wall leg being a disk protruding toward axis 10 and only over the inner 
circumference 37 of the other cylindrical seal leg. The end leg forms with 
its inner circumference the outer boundary of port 14 having constant 
width. This boundary flanks the sharp-edged counter face 43 of valve 39 
which with a single closing seat forms both the outlet valve for reservoir 
2 and the inlet valve for chamber 15. The rear end of seal 38 or the outer 
end face of the radial seal leg forms simultaneously the sealing face for 
axial pretensioned support on the annular end face of the reservoir neck. 
With this neck closing edge 43 can be pushed slightly axially forwards and 
seal 38 is radially tensioned into support on body 5 whilst being secured 
in position. Closing face 41 is formed directly by face 31, namely by an 
annular zone with which face 41 is in edge line contact only and which is 
located nearer to edge 32 than to the rear end of face 31. 
Sharp-edged closing face 42 is formed by the front end of body 20 and is 
flanked at right angles like edge 36 by its front end face as by face 36. 
The counter face 44 is inclined relative to axis 10 and is a truncated 
cone approximating the latter forward at an acute angle. Face 44 adjoins 
with its wider end directly face 37 in one part, extends up to the front 
end of shell 70 and forms the radially outer boundary of opening 16 having 
flow cross-sections reduced in flow direction 64. On this boundary and 
with spacings between its ends face 42 is supported over its full 
circumference only in sharp line contact. Closing faces 41, 42, 44 are 
rigid in response to the operating loads. Face 43 is resiliently and 
elastically yieldable. The radially outer boundary of space 17 is further 
spaced from axis 10 than the radially outer boundary of port 16. The 
latter boundary extends to the end face of shell 70 oriented perpendicular 
to the axis 10 and flanks an acute angle of a tear off edge for the 
medium. Valve 40 is an outlet valve for chamber 15 and an inlet valve for 
chamber 17. Flow through both valves 39, 40 can occur in both directions 
64,65. 
The chamber 15 can extend from the face 43 up to face 44 at which it ends. 
Chamber 15 is divided into longitudinal or chamber sections 45 to 47 the 
adjoining sections of which having different inner or outer radial 
spacings from axis 10 and thus also different flow cross-sections. 
Adjoining chamber end 43 is a prechamber 45 linearly reduced in 
cross-section in flow direction 64. Adjoining port 14, 43 chamber 45 has 
an abruptly widened flow cross-section which is reduced up to edge 32 and 
which in its median zone is largest whilst being smallest relative to all 
other chamber sections in the annular gap or orifice between edge 32 and 
face 37. Relative to this throttle or gap cross-section the directly 
adjoining flow cross-section is larger between faces 33, 37 and smaller 
relative to the mean cross-section of chamber 45 as long as its boundary 
31 is in the starting position (FIG. 2). In the flow direction 64 the 
loosening chamber with face 33 directly adjoins via face 34 an 
apportioning chamber 46 bounded by faces 35, 37. Chamber 46 has constant 
flow cross-sections smaller than those in the region of face 33 or the 
mean cross-section of antechamber 45. Another loosening chamber directly 
adjoins chamber 46, is bounded by faces 36, 44 and has flow cross-sections 
larger than those of chamber 46 or as large as those in the region of face 
33. This cross-section is constricted in direction 64 up to valve seat 42, 
44 at an acute angle of the same pitch as that of the region of port 16 
following directly downstream. Faces 33, 36 can be equidistant, from axis 
10. In the operating end position of body 20 shown in phantom, the edge 32 
and the adjoining end section of face 33 are opposing the resilient inner 
circumference of seal 38, chamber 45 then being smallest. 
Body 20 which may also be composed of several individual bodies, is 
cap-shaped. Its cap opening open forward is a telescopic guide 48 engaged 
slidingly and with contact by the outer circumference of shell 21 without 
medium being able to enter body 20 or opening 48. Body 20 is rearwardly 
loaded relative to unit 4 by spring 50 supported against the bottom of 
opening 48 and countersunk against the rear end of shell 21. Coil spring 
50 is always compressed or pretensioned like spring 25 surrounding it. To 
prevent unit 4 from being pulled off from unit 3 in direction 64 a 
bolt-type intermediate member 49 is provided, traverses and centers spring 
50, is firmly seated with its rear end in a reduced connecting bore of 
opening 48 and is rotatably and longitudinally guided inside shell 21. The 
connecting bore is a blind hole traversing the bottom of opening 48, 
extending up into cone 31 and receives the shaft end of member 49 with a 
pinch fit. This shaft has constant, namely cylindrical cross-sections over 
its full length. 
In the resting position valve 39 is maximally open and valve 40 tightly 
closed. Rearwardly directed stroke motion of unit 4 over a first partial 
stroke 51 causes steady constriction of the flow cross-section of valve 39 
up to closing and steady widening of the flow cross-section of valve 40 up 
to complete opening. At the end of partial stroke 51 faces 41, 43 mutually 
abut. Over the at least 1.5 to two times longer and directly adjoining 
partial stroke 52 continuing in direction 65 body 20 remains halted 
relative to unit 3 due to the stopping action. Thereby, unit 4 is moved 
further rearward relative to bodies 5, 20 counter to spring force 25, 50. 
With stroke 51 units 4, 20 are synchronously moved, and with start of 
stroke 52 unit 4 is lifted from a stop 53 of body 20. Stop 53 is formed by 
an annular bottom face inside shell 21. A widened collar at the front end 
of member 49 adjoins to stop 53 in the resting position. This collar 
prevents units 3, 4 from being pulled apart. Stop 53 locks unit 4 relative 
to body 20 and stop faces 42, 44 lock body 20 relative to unit 3. At the 
end of stroke 52 a rear end of shell 22 abuts unit 4 against a stop 54. 
Stop 54 is formed by the inner bottom face of wall 29. When attempting to 
pull units 3, 4 apart in the resting position, face 42 spreads the front 
end portion of shell 70. As a result, shell 70 tensions shell 22, 58 and 
with contact sliding thereon radially against the inside of shell 24. 
Unit 13 conveying the second medium is a self priming thrust piston air 
pump. Its pressure or pump chamber 55 is located inside cap 23 and bounded 
by the inner circumference of shell 24, the outer circumference of shell 
70, the rear end of shell 22 and by the inside of wall 29. At the front 
end, annular chamber 55 is bounded by a piston 56 firmly or in one part 
connected to shell 22 and bounded by the annular disk-type end wall 57 
thereof. Wall 57 juts radially outwards from the rear end of shell 22 and 
transitions at its outermost circumference into a jacket 58 oriented 
forward. Plunger 56 slides with contact on the cited faces of walls 24, 
70, and may also be formed by a component separate from and more resilient 
than body 4, 22. Locking means 59 which prevents units 3, 4 from being 
pulled apart may also be directly effective between caps 24, 56, for 
example, as a snap lock catching at the front ends of shells 24, 58. 
Piston 56 together with unit 4 is moved synchronously and continuously 
throughout the full stroke 51, 52 and abuts with its end face at the end 
of stroke 52 on end face 54 so that then chamber 55 is totally emptied. 
During a return stroke powered by spring 25, ambient air is drawn into 
widening chamber 55 through a valve 62 pressure-dependently operating to 
open and close an inlet port in the piston's bottom wall 57. Over the 
entire stroke 51, 52, air is forced out of chamber 55 into spaces 15 to 17 
and only over stroke 51, does air move through space 14 and reservoir 2 
through mouths 61. These are located exclusively in chamber 15 and always 
downstream of chamber 45 and of edge 32. Ports 61 may be circumferential 
slots. Ports 61 are oriented radially toward axis 10, are formed by the 
inner ends of highly constricted nozzle ducts and are located in face 37. 
These ducts traverse wall 70 in a perpendicular direction and are oriented 
toward face 33 in the resting position. The axial extension of ports 61 is 
smaller than that of the face 33. Partial sector-shaped ports 61 may take 
up most of the associated circumferential extension so that they have the 
same flow effect over the full circumference of body 20 similar to a 
continuous ring nozzle. 
Therefore, means 60 are formed which divide medium contents within chamber 
15 by an annular disk-shaped flow path into two longitudinal sections, 
namely into a medium section in front of ports 61 and a medium section 
behind ports 61 and located within chamber 45. Prior to closing valve 39, 
air inflowing through ports 61 conveys the medium out of chamber 45 also 
through port 14 back into reservoir 2 and commonly with opening of valve 
40, the medium present in chamber sections 46, 47 is conveyed through 
opening 16 into chamber 17. 
The device 1 is suitable for executing the following methods. From the 
upright standing or the horizontal position the device 1 is taken hold of 
by one hand and turned so that the front end with port 7 is below. The 
medium, particularly powder, sinks by its own gravity through port 14 onto 
face 31 so that its lower portion is provided with a cavity corresponding 
to cone 31 and filling chamber 45 more or less completely. From the margin 
of the cavity the medium continues to flow by its gravity over edge 32 as 
a fine envelope flow through the associated gap and past faces 33, 34 
along face 37 into dosing chamber 46 and along faces 36, 44 up to closure 
40. From there, medium then climbs in filling these chambers up to edge 32 
and, in case, up to completely filling chamber 45. Chamber 15 then can be 
filled fully with medium which is lightly compacted or subjected to its 
own weight pressure. In the case of medium which is less prone to flow or 
trickling this procedure can be assisted by shaking the device manually or 
by means of vibrating units 2 to 4 when actuated. 
Along faces 31 the medium slides at an obtuse angle against and on face 37, 
whereafter it mainly flows forward parallel to axis 10 in direction 64 
until in chamber 47 it flows along face 44 again at an acute angle 
relative to axis 10. It is compacted by filling chamber 47 in the annular 
tapered gap formed by faces 36, 44. After chamber 15 has been filled, the 
device 1 is shortened with discharge actuator 63 formed by units 3, 4 or 
handles 8, 9 resulting in unit 4 being moved in direction 65 relative to 
unit 3. With this start of stroke 51 face 42 lifts from face 44 so that 
chambers 45 to 47 are initially opened steadily per stroke unit before 
being opened progressively, namely when face 42 passes the rear end of 
face 44 into the zone of face 37. The length of face 36 is shorter than 
stroke 51. 
During the stroke 51 air also starts to flow from chamber 55 through ports 
61 initially against face 33, then against face 34 and finally against 
face 35 of body 20 passing them. As a result, medium is forced against 
these faces, loosened and improved in flowability. During the entire 
stroke 51, piston 31 urges the medium present in chamber 45 back through 
the constraint of port 14 into reservoir 2. As a result, edge 32 scrapes 
along the face 37. Part of the inflowing air is also deflected, 
particularly at face 34, rearwards into the edge gap 32 as also into 
chamber 45 and port 14. This forces the medium back and the cleaning of 
faces 41, 43 is assisted. During the entire stroke 51 the flow cross 
section of valve 39 is continuously reduced until it is closed off by 
faces 31, 43 coming into contact with each other. Thereby, face 43 closes 
off medium flow through the annular passage to divide it into separate 
volume components belonging to reservoir 2 and to chamber 15. Then chamber 
45 has a remaining volume which is smaller than the volume of each of 
chambers 15, 46, 47. 
With start of stroke 51 the medium begins to flow from chambers 45 to 47 
along funnel face 44, which tapers inward relative to axis 10 out of 
annular opening 16 towards the outer circumference of ram 19, 21 and 
uniformly distributed over the circumference into annular chamber 17 
having an essentially larger flow cross-section than that of chambers 45 
to 47 or ports 14, 16. The flow cross-section of chamber 17 is larger than 
the sum of cross-sections of spaces 14, 16, 46, namely at most two to 
three times larger than the flow cross-section of port 14 in the fully 
opened condition. The latter may be at least two or three times larger 
than the cross-section of opening 16. The cross-section of chamber 17 may 
thus be at least three or four times larger than that of port 16. The 
inner ring boundary of spaces 16, 17 is continuously constant. The outer 
ring boundary of port 16 passes over stepwise in that of chamber 17. 
Thereby, the medium is loosened in a first step while leaving edge 42 and 
in a second step while leaving port 16. From port 16 and through chamber 
17 the medium falls onto annular face 18 which in a radial plan view is 
oblong or elliptical parallel to axis 10. Face 18 extends with its front 
end up into orifice 7 or passes therethrough (FIG. 2). With the start of 
stroke 51 face 18 or piston body 26, 27 also starts to wander rearwards, 
thereby approaching spaces 2, 14, 45, 46, 47, 16 and steadily reducing 
chamber 17 due to shortening. As a result, the front end of shell 70 also 
acts as a piston up to which approximately the rear end of face 18 is 
moved. The chamber volume 17 is then multiply larger than that of chamber 
15, 45, 46, 47. 
From start to end of stroke 51 the non-rear flowing second portion of air 
flowing through ports 61 flows forwards and forces medium out of chambers 
46, 47 through port 16 into chamber 17 while loosening or atomizing the 
medium. Thereby, port 16 acts as an atomizing nozzle from which air or 
conveying flow emerges mixed with medium. Corresponding atomizing nozzles 
are also formed by the annular gaps at edge 32, at the front edges of 
faces 35, 36 and with increasing constriction at port 14. From port 16 
onwards only flow cross sections essentially widened relative to the above 
and valve-free are provided up to port 7. Therefore, the blended conveying 
flow is no longer compacted. From the entire face 18, medium flows around 
ram 19, 21 and along inner face of shell 22 by its gravity in direction 66 
slantingly downwards into port 7 and therefrom out of device 1. 
Port 7 may be oblong or rectangular at right angles to axis 10 or 
circumferentially. Its rear boundary 67 or edge face is inclined parallel 
to face 18 forming the opposing frontal boundary of port 7. Its flow 
cross-section is smaller than that of spaces 14, 17 and larger than that 
of spaces 16, 45, 46, 47. The flow cross-section of duct 17 may be at 
least two or three times larger than that of port 7. The volume of chamber 
17 is always larger than that of chamber 15 so that when the medium leaves 
the chamber 15 in a corresponding orientation of device 1, it completely 
remains in chamber 17 before then being able to be discharged from port 7 
once the orientation of device 1 has been changed. 
During the entire stroke 52 all air flows from ports 61 only against face 
35 as well as forwards in direction 64. Thereby, before valve 39 closes 
the air flow acting on the dosed medium is weaker. With closing motion of 
valve 39 air flow continuously increases until it remains constant 
throughout entire stroke 52 and fans face 18. With start of stroke 52 stop 
53 lifts or stem 19 begins to move rearwards relative to body 20, further 
pretensioning spring 50. The collar of member 49 shiftable in shell 21 or 
some other component may act as piston of a further conveying unit 69. 
Thereby, a medium, particularly air, is expelled over the entire stroke 52 
out of the interior of cylindrical or hollow body 21 in direction 64 
against the inner side of wall 28. The air flows deflected on wall 28 
orthogonal transverse to axis 10 valve-free to port 7 or a separate outlet 
68. Port 68 is formed by the same opening as port 7, separated therefrom 
by the associated end of face 18 or of walls 26, 27 and slot-shaped 
transverse to axis 10. Slot 68 comprises side bounds common with port 7. 
The medium emerging from port 68 as a flow carpet catches the medium 
detaching from face 18 and endows it after leaving port 7 in a 
corresponding stabilized flow direction. 
At the end of stroke 51, 52 actuator 63 is released so that unit 4 or units 
11 to 13, 69 return by spring 25 to the starting position. During a first 
return stroke 52, valve 39 remains closed and valve 40 is fully opened. 
Therefore, in the output position, no medium is able to flow through 
opening 14 into chamber 15. Only over a second return stroke 51, unit 4 
carries body 20 counter to direction 65. Thereby, valve 39 opens and valve 
40 closes. The stroke direction 65 of unit 4 is parallel but counter to 
direction 64 is the closing direction of face 41 and the opening direction 
of face 42. 
If only few individual dosages of medium need to be discharged, body 6 may 
also form the reservoir and its rear end can be closed off by a bottom. If 
the device is intended as a single-discharge or unidirectional stroke 
dispenser for discharging only a single dosage body 6, valve 39 can be 
eliminated, and chamber 15 can be closed off by wall 29 or the like at 
port 14. At the end of opening stroke of valve 40, body 20 can be caused 
to abut against this closure 40, for example, in the plane of face 43. In 
this case spring 25 may also be eliminated and spring 50 replaced by a 
snap-action catch or the like which positions parts 20, 21 relative to 
each other over stroke 51 and then resiliently abruptly releases their 
mutual locking upon actuating pressure. 
For assembly, one-part body 6, 70 is inserted axially in direction 64 into 
body 23, whereby it may already be preassembled with bodies 20, 38. These 
too are inserted in direction 64 into body 6, 70. After being preassembled 
with body 49 and, in case, with body 50, ram 19 is inserted in direction 
64 into body 22, 28, 56. Thereafter, this preassembled unit is inserted in 
direction 65 into bodies 23, 70, 20. Body 69 too is inserted in direction 
65 into ram 19. 
In FIGS. 3, 4 corresponding parts have the same reference numerals as in 
FIGS. 1, 2, but indexed "a". All features of both embodiments may be 
provided in each other embodiment in addition thereto or in combination 
therewith. A dispenser is conceivable as a unit containing both 
embodiments axially juxtaposed or axially parallel adjoining. The 
description of the embodiments thus applies in sense to all embodiments. 
In FIGS. 3, 4 reservoir 2a is a body of plastics directly connected to unit 
3a, e.g. by a snap connector 6a. Thus outer and equally wide 
circumferences of reservoir 2a and unit 3a go over smoothly and gap-free 
into each other. In one part emanating from the inner circumference of 
outer shell of reservoir 2a and spaced from both ends of this shell is a 
funnel 71 continuously constricted at an acute angle in direction 64a. The 
lower end of duct 71 bounds the short, cylindrical port 14a also forming 
closing face 43a of slide valve 39a. From port 14a in direction 65a a 
projection, such as a tube socket 72 made in one part with funnel 71, 
freely juts into the entire funnel 71. The tubular jacket of socket 72 has 
multiple circumferentially distributed ports or axial slotted openings 73 
extending over its full length. Medium is able to flow therethrough from 
the cross-sectionally annular funnel space radially inwards into socket 72 
by the force of gravity. The upper end of socket 72 is closed off and 
forms a slanting or pointed and conical guide face which uniformly over 
the full circumference guides the medium away from axis 10a on the outer 
circumference of socket 72 and thus into ports 73 or against the funnel 
face 71. 
In the starting position body 20a extends roughly over half its length into 
stationary socket 72 and forms an acute-angled guide face 31a which is 
located in this position totally within socket 72 and over its full length 
in the zone of port 73 extending up to port 14a. Edge 32a is formed by a 
shoulder face directly angularly adjoining the widened end of guide face 
31a and in the starting position is directly juxtaposed with and located 
upstream of opening 14a in the region of the associated ends of the ports 
73 and funnel face. Port 14a has constant inner and outer cross-sections 
over its length. Section 33a forms the radially inner boundary of port 
14a. 
With its constricted end funnel 71 juts in direction 64a freely into 
chamber 15a. Thereby, opening 14a like valve 39a is also spaced from the 
upstream end of chamber 15a. The cited shoulder face serves to support the 
lower end of the sole spring 25a which is always located entirely within 
socket 72. There it loosens the medium by spring motions along the inner 
side of ports 73 and is supported by its upper end at the upper end wall 
of socket 72. At the end of the working stroke body 20a does not reach 
this end wall, but protrudes therein with guide face 31a. 
The volume of chamber 15a is continuously variable by being axially 
shortenable with constant width. The lower length section of chamber 15a, 
port 7a, face 44a and chamber 47a are formed by shell 42a of unit 4 and 
move synchronously in direction 65a by working stroke. For that a piston 
lip 76 is provided at the upper end of shell 22a spaced above wall 57a. 
Lip 76 is made in one part with shell 22 and sealingly runs on the outer 
circumference of shell 70a while sealing chambers 15a, 55a from each other 
as a slide seal. A corresponding lip 77 of plunger 56a protrudes beyond 
wall 57a and slides on the inner circumference of shell 24a. Chambers 15a, 
55a are thus synchronously made smaller with the working stroke. Shell 70a 
freely jutting downwards adjoins wall 29a. The outside of wall 29a is 
totally covered by reservoir 2a. From this outside axially acting snap 
members 6a protrude. Funnel 71 is sealingly supported with an annular 
projection on this outside. 
In the starting position face 34a and directly adjoining face 41a are 
spaced below face 43a. Face 41a is formed by face 35a which continues with 
constant width over the entire corresponding stroke path or up to end 36a. 
After reaching conical face 43a face 35a keeps valve 39a closed over the 
remaining stroke. Ports 61a are located in the uppermost zone of chamber 
15a above opening 14a and are closed by a pressure-dependently operating 
valve 74. Annular or shell-shaped valve body 75 is made in one part with 
funnel 71. Body 75 axially freely protrudes from the outer circumference 
of funnel 71, is inherently spring-resilient and contacts circumference 
37a to cover ports 61a. On over-pressure in chamber 55a body 75 is 
resiliently constricted radially and conically inwardly. Air then flows 
directly below port 14a against circumference 33a, 34a, 35a. 
Annular port 7a is located in axis 10, formed by the lower end of shell 
70a, 22a and thus coincides with port 16a. For this the lower end of shell 
22a has slotted exit ports distributed over the circumference and 
extending up to the lower end edge 67a of shell 22a. This end constitutes 
a cylindrical continuation of funnel face 44a and forms snap members of 
prevention means 59a which secure a carrier 78 for body 20a. Driver 78 is 
formed by the upper end of ram section 21a and fixedly connected to a stop 
79. Only at the end of stroke 51a and after fully opening valve 40a, stop 
79 carries unit 4a, part 22a and piston 56a along. 
Emptying out of port 7a occurs into a collecting vessel, namely a cup 80 
completely removable from the device in direction 64a counter the force of 
snap 59a. Cup 80 is made in one part with members 21a, 26a, 28a and 79. 
Cup 80 slidingly and sealingly contacts with the outer circumference of 
its shell 26a the inner circumference of shell 58a. Annular stop 79 
protrudes beyond the outer circumference of shell 26a. Stop 79 opposes the 
lower end face of shell 58a. 
At the start of actuation, cup 80 forming the actuating member 9a is 
shifted relative to unit 4a and chamber 15a in direction 65a. Thereby, 
carrier 78 drives body 20a. Thus valve 40a is completely opened, whilst 
valve 39a is not yet closed. One-part unit 4a thus has opening 48a for 
insertably and shiftingly receiving shell 26a and section 21a. Ram 21a has 
at its upper end a snap member or an annular collar protruding beyond its 
outer circumference. Additional to end 36a this collar forms with its 
outer circumference face 42a or a valve slide face which together with the 
inner circumference of the lower end of shell 22a forms a further closure 
of valve 40a. After a first part of stroke 51a and after the end 36a has 
already opened, this slide closure also opens. Then medium can flow around 
ram 21a between snap members into cup 80 directly onto the bottom face 
18a. Face 18a slopes at an obtuse angle conically from ram 21a radially 
outwards down to shell 26a and is located in the same plane as stop 79. 
Stop 79 now abuts unit 4a and stroke 52a starts. Only now chambers 15, 55a 
are constricted. Only after a first path of stroke 52a valve 39a closes. 
Prior to and after that compressed air flows through ports 61a behind the 
medium exiting port 14a to accelerate or force it out of port 7a, 16a. 
After release and return of device 1a to its starting position cup 80 is 
withdrawn downwards out of unit 4a so that its medium contents can be 
tipped out. Before this, the annular cup space is sealingly closed off 
from the ambient by unit 4a. The lower end face of cup 80, like face 9, 
forms a standing or actuating face 9a by placing the device 1a on a table 
top with face 9, 9a and then pressing unit 3a downwards to execute the 
stroke. Multiple valves 62a are provided in wall 29a. In the region of 
faces 33a, 34a the cross-section of chamber 15a is rather smaller than in 
the region of face 35a and of end 36a. The lower end of chamber 17a is 
formed by cup 80. Face 9a is formed by a dish- or cup-shaped foot 85 
protruding radially beyond the outer circumferences of units 2a, 3a, 4a. 
The cup bottom is on top and forms stop 79 as also vessel bottom 28a from 
which ram 21a juts upwards in one part to have member 78 located below the 
upper end of shell 26a. Base 85 forms also a handle for pulling out cup 
80. 
For incrementally varying the volume filling chamber 15a for receiving the 
dosing volume setting means 81 are provided which continuously vary the 
starting position between units 3a, 4a so that only stroke length 52a is 
varied. Full opening of valve 40a by the third shifting unit 80 is always 
sure. A setting cam 53a is made in one part with and juts radially outward 
from shell 58a to pass through a slope or winder guide 82 in the lower end 
of shell 24a. Mutual rotational motions of units 3a, 4a positively result 
in mutual axial motions. Parallel stroke guides 83 emanate transversely in 
direction 65a from guide 82 for cam 53a. The ends of guides 83 remote from 
guide 82 form stops 54a located in a common height to always assure the 
same final stroke position. Guides 83 differ in length incrementally. 
Opposing each stroke guide 83 guide 82 forms a catch 84 in which cam 53a 
is locked in the starting position by spring 25a against motions along 
guide 82, but not against stroke motions. Thus a correspondingly large 
rotary force overcomes the locking stress. Laterally adjacent to the 
longest guide 83 an assembly insertion orifice emanates from the lower end 
edge of shell 24a which resiliently widens on assembly insertion to then 
snap back so that it serves as a positive withdrawal preventor between 
units 3a, 4a. 
At this onset of guide 82 cam 53a is fixed against directions 64a, 65a and 
positionally secured against rotational motions toward the other end of 
guide 82 by a resilient catch, for example a cam of shell 24a. In this 
initial position of means 81 the units 2a, 3a are thus positively locked 
against mutual shifting in directions 64a, 65a. On the outer circumference 
of shell 24a a handle is located and made in one part with cam 53a for 
manually turning unit 4a relative to unit 3a. 
In the locked position the device 1a may also be secured to be childproof. 
Cam 53a in its radial length direction can have adjoining sections 
differing in width, only the section located at the handle is suitable for 
overcoming the rotation catch and is located radially outside of this 
catch when the handle is unactuated. Only by pressure exerted radially 
inwards on the handle this cam section can be brought into the region of 
the catch and then transposed into guide 82. These safety means act even 
better when two identical but diametrically opposed handles are provided 
for cam control 81, requiring both to be pressed simultaneously for 
unlocking. 
Reservoir 2a is sealingly closed at the upper end by an openable cover 86 
for refilling. Cover 86 forms handle 8a and has inside a chamber sealed 
from the ambient. This chamber is filled with a dessicant or moist 
adsorbant and connected to the reservoir chamber only via a partition 87 
permeable to moisture and gas. Partition 87 can close off the sole filling 
port of this chamber and may be a disk or a filter which is impermeable 
for the medium. Therefore the stored medium, particularly a dry medium, is 
protected from moisture. 
The air accelerating the flow of the medium cleans all conveying paths of 
the medium. Thereby, very narrow dosing limits can be maintained. This is 
improved if the boundary faces of medium spaces 7, 7a and 14, 14a to 17, 
17a as also guide face 18 or the interior of cup 80, namely all faces 
coming in contact with the medium, have a coating acting as an 
anti-sticking or anti-static surface of metal and/or a plastics such as 
tetrafluoroethylene. Thereby, sticking of the medium due to electrostatic 
charging or the like is prevented. The coating is only a few .mu.m thin 
and can be applied to the faces by lacquering, bonding, embossing, 
pressure rolling or the like.