Abstract: A method of estimating a precise position of a door by receiving data from a micro-electromechanical six-axis accelerometer, is provided and includes at least the steps of: applying the six-axis data to a symplectic geometry; measuring each dynamic function as a linear combination of energy states in each axis; differentiating to form six differentiations sets of six quantised states; applying an unsupervised machine learning model including a fuzzy logic engine and outputting an estimate of the precise position of the door.

Abstract: A retrofit unit is disclosed, adapted to be attached to a door as part of a door closer apparatus, the door closer apparatus being adapted to selectively prevent or facilitate movement of a door relative to its associated door frame, the retrofit unit comprising energy harvesting means adapted to convert energy harvested into electrical energy, the retrofit unit further having a first energy storage means, control means adapted to control the door closer unit, one or more sensors adapted to detect one or more environmental state, and a communication means adapted to transmit and receive information wirelessly to and from a remote base station and adapted to transmit and receive information wirelessly to and from a further retrofit unit. A door-integrated unit is also disclosed, as well as a fire safety system having a plurality of units and one or more base stations.

Abstract: A downhole perforator assembly (10) for establishing communication between the interior of a tubular string (18) and a surrounding annulus (24) includes a downhole power unit (100) having a power unit housing (150) and a moveable shaft (130) and a downhole perforator (260) having a perforator housing (262), a mandrel (278) slidably positioned within the perforator housing (262) and a penetrator (288) radially outwardly extendable from the perforator housing (262). The power unit housing (150) is operably associated with the perforator housing (262) and the moveable shaft (130) operably associated with the mandrel (278) such that when the downhole power unit (100) is activated and the moveable shaft (130) is longitudinally shifted relative to the power unit housing (150), the mandrel (278) is longitudinally shifted relative to the perforator housing (262) and at least a portion of the penetrator (288) is extended radially outwardly from the perforator housing (262).

Abstract: A downhole perforator assembly (10) for establishing communication between the interior of a tubular string (18) and a surrounding annulus (24) includes a downhole power unit (100) having a power unit housing (150) and a moveable shaft (130) and a downhole perforator (260) having a perforator housing (262), a mandrel (278) slidably positioned within the perforator housing (262) and a penetrator (288) radially outwardly extendable from the perforator housing (262). The power unit housing (150) is operably associated with the perforator housing (262) and the moveable shaft (130) operably associated with the mandrel (278) such that when the downhole power unit (100) is activated and the moveable shaft (130) is longitudinally shifted relative to the power unit housing (150), the mandrel (278) is longitudinally shifted relative to the perforator housing (262) and at least a portion of the penetrator (288) is extended radially outwardly from the perforator housing (262).

Abstract: There is provided a device for installing traction chains about a dual wheel assembly. The device comprises an elongate member having a first end and a second end. A portion of the elongate member adjacent the first end has opposed planar surfaces and the elongate member is of sufficient length to extend from an outer side of the dual wheel assembly to an inner side of the dual wheel assembly. A first hook extends from the first end of the elongate member, the first hook has planar lateral side; a second hook extends from the second end of the elongate member; and a third hook extends from the elongate member, the third hook being disposed between the first hook and the second hook. The elongate member, the first hook, the second hook and the third hook comprising a rigid body.