A flue mounted hoist includes an anchor section for anchoring within a flue hole, and an extendable arm. A winch is provided at the end of the extendable arm for attachment to a boiler. The flue mounted hoist allows safe lifting and installation of a wall-mounted boiler by a single person.

A flue mounted hoist includes an anchor section for anchoring within a flue hole, and an extendable arm. A winch is provided at the end of the extendable arm for attachment to a boiler. The flue mounted hoist allows safe lifting and installation of a wall-mounted boiler by a single person.

A deck for use in construction, the deck comprising: a stationary support structure including at least a first box tube and a second box tube disposed parallel to the first box tube, the stationary support structure being positionable entirely within an edge of a floor of a building; a bottom plate extending between said first box tube and said second box tube; a first extension member disposed within the first box tube and being operable to retractably extend from the first box tube; a second extension member disposed within the second box tube and being operable to retractably extend from the second box tube; and a platform having one or more wheel structures located along one or more sides of the platform, wherein the one or more wheel structures are comprised of a wheel mount and one or more wheels and the one or more wheels are configured to roll along a top surface of the first box tube and/or a top surface of the second box tube, and wherein the platform is operable to retractably extend at least partly beyond the edge of the floor in conjunction with the first extension member and the second extension member.

A flue mounted hoist includes an anchor section for anchoring within a flue hole, and an extendable arm. A winch is provided at the end of the extendable arm for attachment to a boiler. The flue mounted hoist allows safe lifting and installation of a wall-mounted boiler by a single person.

A telescopic boom extension device includes a driving mechanism. The driving mechanism that drives B pins and a C pin includes a hydraulic supply part and a drive source generation part. The drive source generation part generates a predetermined hydraulic pressure at the hydraulic supply part based on a pneumatic pressure. The hydraulic supply part has an accumulator and AOHs and supplies a hydraulic pressure to a cylinder-boom coupling mechanism and an inter-boom fixing mechanism. The drive source generation part uses a pneumatic supply part to send compressed air to the hydraulic supply part.

A telescopic boom extension device includes a driving mechanism. The driving mechanism that drives B pins and a C pin includes a hydraulic supply part and a drive source generation part. The drive source generation part generates a predetermined hydraulic pressure at the hydraulic supply part based on a pneumatic pressure. The hydraulic supply part has an accumulator and AOHs and supplies a hydraulic pressure to a cylinder-boom coupling mechanism and an inter-boom fixing mechanism. The drive source generation part uses a pneumatic supply part to send compressed air to the hydraulic supply part.