Patent ID: 8505778

Claim:
A manual piston pump having a dispensing head for dispensing fluid substances, comprising: a cylinder, an inner locking sleeve forming a cylindrical passage for a hollow piston rod to pass through, one end of the piston rod extending into a pump chamber of the cylinder and the other end carrying the dispensing head, which is provided with an outer shaft section, a spring which presses the piston rod outwards in relation to the cylinder, into a rest position, and in opposition to the spring force whereof the piston rod may be lowered by pressing on the dispensing head in order to dispense substance, at least one projection and at least one recess, wherein the at least one recess comprises a latching lug arranged on a resilient web which is articulately mounted at the end side and can be latched as a joining partner to the at least one projection, and, wherein the inner locking sleeve together with the cylinder form a guide channel between the inner locking sleeve and the cylinder, the guide channel acting as a track for the outer shaft section of the dispensing head to move along, parallel to the piston rod, and wherein the piston rod and the inner locking sleeve form an inner cage for receiving the spring.