Abstract: A fluid flow control device comprises a duct having an inlet aperture and an obturating member, which is mounted in the duct and movable by an actuating member between a first position in which it closes the duct and a second position in which the duct is fully open. The control device comprises a flexible membrane which is fixed around its periphery to the annular wall of the duct. The membrane is arranged to adopt a closing position in which its central region closes off the inlet aperture within the duct, and an open position in which its central region is spaced away from the inlet opening so that the fluid can pass through the latter and through further apertures formed in an annular region of the membrane which join its central region to its periphery.

Abstract: A fluid flow control device comprises a duct having a masking membrane arranged within the duct for movement between a first position, in which it closes the duct, and a second position in which it allows fluid to pass through the duct. The masking member is in the form of a deformable membrane disposed across the duct, the membrane having two portions having bellows-type folds and opposed end elements defining between them a flow aperture, which can be opened or closed to adjust the fluid flow.

Abstract: The invention is concerned with a retaining arrangement for a bearing of an electric motor, the retaining arrangement comprising a resilient element and a bell ring.The resilient element comprises a securing ring having a peripheral anchor rim portion which, in transverse cross section, has two branches, namely an outer branch and an inner branch. The outer branch carries anchoring arrangement, while the inner branch is interrupted by slots and carries securing fingers at an axial distance from the zone in which the two branches are joined.The invention is applicable to an electric motor for a heating system.

Abstract: A vibration resistant fixing or securing means, for fastening or securing a first member to a second member, comprises a resilient bush gripping one of the said members and having a fastening stud, carried by the other of the said members, extending through it. The fastening stud and the said first member are so shaped as together to constitute a compression stud assembly comprising a male part and a female part, which are adapted to be locked together and to extend through an opening formed in the second member and resilient bush, the latter comprising a boss having one free end portion with a radially projecting portion at its other end, and the compression stud assembly including a shoulder and a flared portion, which cooperate to maintain the free end portion and radially projecting portion of the bush respectively in gripping contact with edges of the opening in the second member.