Abstract: A coupling, arranged to form a frictional joint between two mechanical elements, comprising a tubular contact member, arranged to take up a non-deformative frictional contact with an element to be attached by means of a first peripherical surface when force transforming ring having a conical contact surface is moved against a co-acting conical contact surface at the opposed peripherical surface of the contact member by means of a manually operated and linearly movable force applying member, thereby applying a force at one point along said surface of the contact member, said contact member being arranged with such a longitudinal section that the force applied at one point by the force transforming ring is equally distributed along the surface in contact with the member to be attached.

Abstract: A coupling, arranged to form a frictional joint between two mechanical elements, comprising of a tubular contact member, arranged to take up a non-deformative frictional contact with an element to be attached by means of a first peripherical surface when a mainly plane spring ring, extending from the opposed peripherical surface mainly perpedicularly to the length axis of the element to be attached, is twisted or tilted by means of a manually operated force applying member to an inclined relationship to said length axis, said tubular contact member having a longitudinal section causing the applied force from the spring ring to be equally distributed over the contact surface with the element to be attached.

Abstract: A coupling forming a connection between two elements or fittings, at least one of which has a cylindrical, or multifaced, outer surface, including in longitudinal section, a flexible beam member and a nose portion which, under application of a force in direction towards the nose portion and the beam member, makes contact with an element inserted into the coupling. The beam member and the nose portion can either be formed in one piece or in two separate but interlocked parts, generally completely surrounded by the element to be connected to the element inserted into the coupling.