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A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [ 2 ] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [ 3 ]
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
Lift slab construction (also called the Youtz-Slick Method) is a method of constructing concrete buildings by casting the floor or roof slab on top of the previous slab and then raising (jacking) the slab up with hydraulic jacks. This method of construction allows for a large portion of the work to be completed at ground level, negating the ...
The roof-mounted turret was designed by Cardox Ltd and fed by a 14 pounds per square inch (97 kPa) rotary vein pump (also built by Cardox Ltd). [3] It was manned by one firefighter, who would stand in a roof hatch. This hatch was positioned to the rear of the cab and would latch shut.
The cabin flips for repairs and maintenance and has a manual-hydraulic flip mechanism. Oil and liquids are checked via a front service hatch. The engine is the Mercedes-Benz OM352 A , a water-cooled six-cylinder in-line diesel with turbocharger and integrated compressor, producing 127 kW/172 hp at 2,800 rpm from a displacement of 5,675 cc. Max ...
BTR-50PK (Ob'yekt 750K) (K stands for krisha – "roof") (1958) – A BTR-50P fitted with an armored roof, the troops embarking and disembarking the vehicle via two rectangular roof hatches that open to either side. There is also another rectangular roof hatch at the front of the roof.
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