the central part of the unit being supported by one element and both extremities of the unit being supported by a single other element, i.e. double acting mounting

Full Title

Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs (F16F5/00, take precedence) > comprising both a plastics spring and a damper, e.g. a friction damper > the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper (F16F13/26 takes precedence) > the central part of the unit being supported by one element and both extremities of the unit being supported by a single other element, i.e. double acting mounting