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A screw jack consists of a heavy-duty vertical screw with a load table mounted on its top, which screws into a threaded hole in a stationary support frame with a wide base resting on the ground. A rotating collar on the head of the screw has holes into which the handle, a metal bar, fits.
Jack which can lift a mobile home. A jack is a mechanical lifting device used to apply great forces or lift heavy loads. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. [1] The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be ...
Manual laboratory scissor jack, or laboratory lifting platform for other laboratory equipments. Laboratory scissor jacks are lifting stages for beakers, flasks, water baths, stirrer, or other lab tools used to elevate equipment height to the user's needs, usually around 5 to 20 cm. It consists of metal pieces connected together in a scissor ...
Button hole scissors: Adjustable, short-bladed, heavy-duty scissors for opening button holes. Dress-maker's shears: Dressmaker's shears have a long blade, typically 7–10 in (18–25 cm), for cutting out fabric. Blades are tapered, with one pointed and one rounded tip; the blunt tip prevents fabric from snagging on seams and threads.
The most common lift table design incorporates hydraulic cylinders and an electrically powered pump to actuate the scissor lifting mechanism. Lift tables can also be driven by pneumatic sources, trapezoidal-threaded screw drives, push chains or by hydraulic foot pump when the load is not heavy. The choice of drive mechanism depends on factors ...
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