Abstract: FIGS. 1-16D & 66A-92D disclose a large variety of methods of forming the headgear for use in combination with a breathing apparatus including a unitary plastic core within textile casings. In some configurations, the plastic core material penetrates or bursts-through the textile casing of the straps. Some configurations include over moulding, alignment posts, T-joints and joint housings with injection aperture. FIGS. 17-65 & 93A-94C disclose a large variety of different headgear arrangements including top strap, front strap, rear strap and pairs of straps extending from the mask above and below the ear to meet behind the ear. FIGS. 95-121B disclose a large variety of connectors connecting the headgear assembly to the mask assembly where the headgear, mask and connector form a closed loop when the connector is disengaged with the mask assembly.

Abstract: In a penstock internal maintenance system, the penstock includes an inclined portion between upper and lower ends, the upper end arranged in an edifice including a water collecting chamber and a gate bearing structure allowing a gate to close the penstock, the gate bearing structure adjacent the water collecting chamber forming a vertical pit. The system includes a set of units assembled in an assembled configuration and separated in a dismounted configuration, the units including an anchor unit, a launching unit and a penstock inspection platform unit, the units in the dismounted configuration being enter the penstock through the gate bearing structure adjacent the water collecting chamber, the units are assembled when located in the penstock, the anchor unit slidingly received and retained in the gate bearing structure, the anchor unit having two lateral edges being guided and retained in two vertical lateral grooves of the gate bearing structure.

Abstract: A portable davit base for removable attachment to a rooftop davit pedestal having a mounting plate includes two opposed side plates and two metal transverse supporting members for mounting on the mounting plate and secured thereto with connector pins that extend underneath edges of the mounting plate on opposite sides of the davit pedestal. The opposed side plates have vertically spaced apertures for inserting davit mast supporting pins for pivotal mounting of a mast on the assembly. A davit arm connected to the mast is rigidly attached to the portable davit mounting assembly for use in suspending scaffolding over the side of a building.

Abstract: A portable davit base for removable attachment to a rooftop davit pedestal having a mounting plate includes two opposed side plates and two metal transverse supporting members for mounting on the mounting plate and secured thereto with connector pins that extend underneath edges of the mounting plate on opposite sides of the davit pedestal. The opposed side plates have vertically spaced apertures for inserting davit mast supporting pins for pivotal mounting of a mast on the assembly. A davit arm connected to the mast is rigidly attached to the portable davit mounting assembly for use in suspending scaffolding over the side of a building.