Patent ID: 8318108

Claim:
A liquid dispenser for receiving and dispensing a sample, which comprises: a body part; a cylinder part arranged inside the body part; a suction plunger movably arranged inside the cylinder part; and a function plunger disposed at an upper part of the body part of the liquid dispenser and detachably connectable to the suction plunger, wherein the sample is received into the liquid dispenser by a receiving movement of the suction plunger at a first speed in a connected state with the function plunger, and the sample is dispensed from the liquid dispenser by an emptying movement of the suction plunger at a second speed greater than the first speed in a disconnected state from the function plunger, the liquid dispenser further comprising: an energy storing device for providing energy to move the suction plunger during the emptying movement; a locking device for locking the energy storing device from releasing the energy; a launch device for releasing the locking device such that the energy is provided to move the suction plunger during the emptying movement, wherein: the energy storing device is a spring; and the locking device is a magnet, wherein the launch device further comprises: an actuator shaft with a magnetic property and which has a lower part and an upper part, wherein the actuator shaft is disposed such that the lower part of the actuator shaft is connected to the suction plunger and the upper part of the actuator shaft is connectable to a lower part of the function plunger via the magnet; a launch body which accommodates the upper part of the actuator shaft and the magnet; a launch pin disposed at an upper part of the launch body; and an upper flange disposed in the upper part of the body part, wherein the suction plunger is disposed at a lower part of the body part, the spring is arranged to be strained between the launch body and the actuator shaft, and the launch pin, the upper flange, and the spring are arranged so that when the function plunger is moved upward in relation to the body part until the launch pin contacts the upper flange, the contact between the launch pin and the upper flange causes separation of the actuator shaft from the magnet, whereby the spring forces the actuator shaft in a downward movement to effect the emptying movement of the suction plunger at the second speed.