Dispensing unit
The invention relates to a dispensing unit for dispensing two fluid substances. The dispensing unit comprises a pump assembly ( 2 ) having a first ( 4 ) and a second pump ( 5 ) which can be actuated by common, manually operable operating means ( 6 ) in order to simultaneously dispense the two fluid substances. The dispensing unit also comprises a reservoir assembly ( 3 ), the reservoir assembly comprising two reservoirs which are each provided at an outlet side with an outlet and are each delimited by a movable piston ( 13, 16 ) on the other side from the outlet, which pistons, during the dispensing of the fluid substances, move toward the respective outlets. According to a first aspect of the invention, the reservoir assembly ( 3 ) and the pump assembly ( 2 ) are separate assemblies which can be coupled to one another, in such a manner that in the uncoupled state each reservoir can be filled through the outlet of the reservoir, after which the pump assembly and the reservoir assembly are coupled to one another.
1. Dispensing unit for dispensing two fluid substances, comprising:
a pump assembly having a first pump and a second pump, actuable by a common, manually operable operating means to simultaneously dispense the two fluid substances, and
a reservoir assembly for holding the two fluid substances, the reservoir assembly comprising two integral reservoirs, which are each provided with an outlet at an outlet side and are each delimited by a movable piston on a side remote from the outlet, wherein each of the pistons moves towards a respective one of the outlets during the dispensing of the fluid substances, characterized in that the reservoir assembly and the pump assembly are separate assemblies which are couplable to one another, in such a manner that in an uncoupled state each reservoir is filled through the outlet of the reservoir, after which the pump assembly and the reservoir assembly are coupled to one another, wherein a diameter or cross section of the first and/or second reservoir is increased in a vicinity of the outlet, in such a manner that the piston is under a reduced prestress in a filling position in the vicinity of the outlet.
2. Dispensing unit according to claim 1 , wherein each piston prior to filling of the respective reservoir is located in the filling position close to the outlet.
3. Dispensing unit according to claim 1 , wherein a first reservoir is delimited by an inner side of a first substantially cylindrical tube, the reservoir being delimited, on the side remote from the outlet side, by a continuous, substantially disk-like piston.
4. Dispensing unit according to claim 1 , wherein a second reservoir is delimited by the outer side of the first cylindrical tube and an inner side of a second substantially cylindrical tube, which surrounds the first cylindrical tube, the reservoir being delimited, on the other side from the outlet side, by a continuous, substantially annular piston.
5. Dispensing unit according to claim 1 , wherein the diameter or cross section of the first and/or second reservoir decreases in the direction of the outlet side over at least a section of the length of the reservoir.
6. Dispensing unit according to claim 5 , wherein the diameter of the inner side of the first cylindrical tube decreases in the direction of the outlet side.
7. Dispensing unit according to claim 5 , wherein the distance between the outer side of the first cylindrical tube and the inner side of the second cylindrical tube decreases in the direction of the outlet side.
8. Dispensing unit according to claim 5 , wherein the diameter of the inner side of the second cylindrical tube decreases in the direction of the outlet side, the outer side of the first cylindrical tube being straight.
9. Dispensing unit according to claim 1 , wherein the diameter of the inner side of the first cylindrical tube, at the location of the piston position in the vicinity of the outlet, substantially corresponds to the diameter of the substantially disk-like piston.
10. Dispensing unit according to claim 1 , wherein the distance between the outer side of the first cylindrical tube and the inner side of the second cylindrical tube, at the location of the piston position in the vicinity of the outlet, substantially corresponds to the width of the ring of the substantially annular piston.
11. Dispensing unit according to claim 1 , wherein the reservoir assembly comprises a cover which closes off the reservoirs on the outlet side, the first and second outlets being arranged in the cover.
12. Dispensing unit according to claim 11 , wherein the cover is formed integrally with the second cylindrical tube.
13. Dispensing unit according to claim 11 , wherein the cover comprises a coupling rim for coupling a pump assembly to it in order to form a dispensing unit.
14. Dispensing unit according to claim 1 , wherein the reservoir assembly further comprises a connecting element which connects the first and second cylindrical tubes to one another in the vicinity of those ends of the first and second cylindrical tubes which are remote from the outlet side.
15. Dispensing unit according to claim 14 , wherein the connecting element is formed integrally with the first cylindrical tube.
16. Dispensing unit according to claim 11 , wherein the cover is connected to the first and/or second cylindrical tube by means of a click-fit connection.
17. Dispensing unit according to claim 14 , wherein the connecting element is connected to the first and/or second cylindrical tube by means of a click-fit connection.