Abstract: A fall protection tool for use in blocking an opening in a doorframe. The tool includes a frame assembly including a pair of lateral posts spaced from each other and extending substantially parallel with each other, and at least one transverse post extending between the pair of lateral posts. The tool also includes a hook member coupled to each lateral post, wherein the hook member is configured to couple to a portion of the doorframe such that the frame assembly is hangable from the doorframe.

Abstract: A fall protection tool for use in blocking an opening in a doorframe. The tool includes a frame assembly including a pair of lateral posts spaced from each other and extending substantially parallel with each other, and at least one transverse post extending between the pair of lateral posts. The tool also includes a hook member coupled to each lateral post, wherein the hook member is configured to couple to a portion of the doorframe such that the frame assembly is hangable from the doorframe.

Abstract: An engine (400) is disclosed and comprises: a compressor (428) which periodically defines a chamber and carries out a pressurization process wherein the chamber volume is decreased to produce pressurized air; a combuster (426) which combusts fuel with the pressurized air to produce primary exhaust; an air motor (408) which is driven by the primary exhaust to produce power and secondary exhaust; an expander (410) which expands the secondary exhaust to produce tertiary exhaust and power; and a shaft (314) which directs power produced by the motor (408) and the expander (410) to the compressor (428) and any load. The combuster (426) is adapted to receive varying amounts of fuel, thereby to vary the power to the load. The compressor (428), during pressurization. releases air from the chamber such that the chamber pressure during pressurization and the primary exhaust pressure is substantially constant at steady state conditions, said constant being a function of the load being driven by the power.