Patent ID: 7997403

Claim:
A mechanical interface for transferring a reciprocating movement from a base element to an interacting element, wherein the interacting element is releasably mountable to the base element, comprising: at least a first, second and third interface point between the base element and the interacting element, wherein each interface point comprises a base contact portion and an interacting contact portion, wherein said base element comprises or is connectable to a motion generator configured to provide said reciprocating movement essentially in a first, longitudinal direction, wherein at least two of said first, second and third interface points are longitudinally spaced apart, and at least two of said first, second and third interface points are laterally spaced apart in a second, lateral direction essentially perpendicular to said first direction, wherein at least one of said first, second and third interface points is arranged to transfer said reciprocating movement from the base element to the interacting element, and at least one of said first, second, and third interface points provides a supporting engagement between said base and said interacting element, but is passive with regard to transferring reciprocal movement, wherein at least one of the base contact portion and the interacting contact portion of the at least one interface point arranged to transfer said reciprocating movement includes at least two oppositely facing curved contact surface portions, arranged in longitudinal alignment with said first direction, such that said curved contact surface portions are in abutment with opposing contact surface portions of the interface point when the interacting element is mounted to the base element, thereby transferring said reciprocating movement from the base element to the interacting element, and wherein the at least one interface point providing a supporting engagement is configured to allow for longitudinal motion between the contact surfaces of the base element and the interacting element.