(under the class definition) Spring device in which a portion of a spring element is movable in rubbing contact with a surface of a solid body or through a viscous body; said movement being responsive to the application of a force and impeded by said rubbing contact.
(1) Note. Movement, for this subclass, may be (and usually is) that of a portion of a spring body as a consequence of the deformation of the body as a whole. The surface for rubbing contact may be that of another, concentric spring body.
