Dispenser

A dispenser for discharging an amount of a substance to be discharged, the dispenser comprising:

• a cartridge holder for holding a cartridge with a metering device, wherein the metering device comprises a first coupling portion and a recess;
• a drive unit that is mounted movably relative to the cartridge holder;
• and
• a drive element;
• wherein the drive unit comprises a second coupling portion for connection to the first coupling portion of the cartridge when the cartridge is held by the cartridge holder;
• and
• wherein the drive unit is connected to the drive element;
• wherein the drive element comprises a spring element, which in operation is configured with the cartridge and held in the cartridge holder to accelerate, by a force of the spring element, an amount of substance, which is received in the recess of the metering device of the cartridge in a direction of ejection, upon leaving the dispenser.

A cartridge for use in a dispenser with a drive unit, wherein the drive unit comprises a first coupling portion and is connected to a drive element, the drive element comprising a spring element, the cartridge comprising:

• a container with a discharge opening;
• and
• a metering device that is mounted movably relative to said discharge opening and that has at least one recess for conveying a defined maximum volume of the substance to be discharged through the discharge opening and out of the container,
• wherein the metering device comprises a second coupling portion for connection to said first coupling portion of the dispenser, wherein in a connected state, a force exerted by the drive element of the dispenser is transmitted by the first coupling portion and the second coupling portion to the metering device.

A method for using a dispenser, for discharging an amount of a substance to be discharged, the dispenser comprising:

• a container with a discharge opening;
• a metering device mounted movably relative to said discharge opening and having at least one recess for conveying the substance to be discharged through the discharge opening and out of the container;
• wherein said metering device is connected to a drive element, the drive element comprising a spring element;
• wherein the drive element is configured to accelerate an amount of the substance, which is received in the recess of the metering device in a direction of ejection, as said amount leaves the dispenser;
• the method comprising operating the dispenser for at least one discharge cycle, wherein a discharge cycle comprises a movement of the recess of the metering device from a receiving position, in which a volume of the at least one recess communicates with a volume of the container, through the discharge opening into a discharge position, in which a volume of the at least one recess communicates with the surroundings of the dispenser, accelerating an amount of substance conveyed in the recess in a direction of ejection by the spring element, prior to reaching the discharge position.