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A Safe Load Indicator (SLI) or an Automatic Safe Load Indicator (ASLI) is a device which is installed on mobile or portal cranes to alert the operator if the lift is exceeding the safe operating range of the machinery. [1] In some cases, the device will physically lock the machinery in circumstances it determines to be unsafe.
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Greco-Roman Trispastos ("Three-pulley-crane"), a simple crane type (150 kg load) A crane for lifting heavy loads was developed by the Ancient Greeks in the late 6th century BC. [7] The archaeological record shows that no later than c. 515 BC distinctive cuttings for both lifting tongs and lewis irons begin to appear on stone blocks of Greek ...
A load cell converts a force such as tension, compression, pressure, or torque into a signal (electrical, pneumatic or hydraulic pressure, or mechanical displacement indicator) that can be measured and standardized.
A level-luffing crane is a crane mechanism where the hook remains at the same level while luffing: moving the jib up and down, so as to move the hook inwards and outwards relative to the base. [ 1 ] Usually the description is only applied to those with a luffing jib that have some additional mechanism applied to keep the hook level when luffing.
Safe Load Indicator, in cranes; SLI battery, used in automotives; Space Launch Initiative, a US project; Specific language impairment, a medical diagnosis; Symmetric level-index arithmetic, in mathematics
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A friend, Gordon Burt of Mowlem, was having trouble with jib cranes and Nash came up with a device to calculate and display the weight of a load a crane was about to lift. In 1929 he launched Nash Safe-Load Indicators, manufacture was later licensed to Vickers.
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