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A house raised and held on box cribs during foundation work. House raising (also called house lifting, house jacking, barn jacking, building jacking) is the process of separating a building from its foundation and temporarily raising it with hydraulic screw jacks.
Winter is coming. You know what that means. Your utility bills are about to skyrocket. But here’s the good news: You don’t need to spend hundreds on fancy smart thermostats or new appliances ...
A scissor jack uses the mechanical advantage of a leadscrew and 4-bar linkage to allow a human to lift a vehicle by manual force alone. They are inexpensive and are common in manufacturer-supplied breakdown kits. The jack shown at the left is made for a modern vehicle and the notch fits into a jack-up point [3] on a unibody. Earlier versions ...
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.
A jack post (telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of ceilings, walls and trenches . They are designed to be able to mechanically telescope to about twice their shortest length in order to span a wide variety of spaces.
LG and Hitachi created joint ventures named Hitachi-LG Data Storage in 2000 and LG Hitachi Water Solutions in 2011; among other partnerships it has had, LG has a long relationship with Hitachi dating back to the early years of Goldstar. Since then Hitachi has transferred technologies for LG's products such as radios, wires, TVs, home appliances ...
A jack is a connector that installs on the surface of a bulkhead or enclosure, and mates with its reciprocal, the plug. [36] According to the American Society of Mechanical Engineers , [ 37 ] the stationary (more fixed) connector of a pair is classified as a jack (denoted J), usually attached to a piece of equipment as in a chassis-mount or ...
This property is also the basis for the use of screws in screw top container lids, vises, C-clamps, and screw jacks. A heavy object can be raised by turning the jack shaft, but when the shaft is released it will stay at whatever height it is raised to. A screw will be self-locking if and only if its efficiency is below 50%.