Abstract: A joining element for square U-Shaped channelled structural members that have formed longitudinal ribs and an open slot. The joining element comprises a central body having one or more cruciform shaped protrusions. Each protrusion has a plurality of landing surfaces that engage with the channelled structural member so that when a protrusion is inserted into the end of the channelled structural member the landing surfaces of the protrusions positioned inside the arms of the crucifix protrusion, engage the free edges of the longitudinal ribs making a snug fit. The plurality of landing surfaces allows the channelled structural members to be independently rotated so that the open slot formed by the longitudinal ribs is oriented in the desired direction.

Abstract: A joining element for square U-Shaped channelled structural members that have formed longitudinal ribs and an open slot. The joining element comprises a central body having one or more cruciform shaped protrusions. Each protrusion has a plurality of landing surfaces that engage with the channelled structural member so that when a protrusion is inserted into the end of the channelled structural member the landing surfaces of the protrusions positioned inside the arms of the crucifix protrusion, engage the free edges of the longitudinal ribs making a snug fit. The plurality of landing surfaces allows the channelled structural members to be independently rotated so that the open slot formed by the longitudinal ribs is oriented in the desired direction.

Abstract: An apparatus for controlling the starting and stopping of an AC induction motor, the apparatus comprises a first and a second magnetic permeable portions having a plurality of legs wherein a magnetic control flux of the second magnetic has an opposite magnetic polarity to the magnetic control flux of the first magnetic permeable portion; anon-spacer separating the first and second magnetic permeable portions to prevent magnetic control flux cancellation between the first and second magnetic permeable portions; a first and second AC power phase windings; and a first and second group of DC excitation control windings.

Abstract: An apparatus (10) for controlling the starting and stopping of an AC induction motor, the apparatus (10) comprising: a first magnetic permeable portion (20) having first (21), second (22) and third legs (23); a second magnetic permeable portion (40) arranged relative to the first magnetic permeable portion (20) such that a magnetic control flux of the second magnetic permeable portion (40) has an opposite magnetic polarity to a magnetic control flux of the first magnetic permeable portion (20), the second magnetic permeable portion (40) having fourth (41), fifth (42) and sixth legs (43); a non-magnetic spacer (3) separating the first and second magnetic permeable portions (20, 40) to prevent magnetic control flux cancellation between the first and second magnetic permeable portions (20, 40); a first AC power phase winding (90) wound around the first and fourth legs (21, 41); a second AC power phase winding (100) wound around the third and sixth legs (23, 43); a first pair of DC excitation control windings (70