Category:Lever jacks
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English: Lever jacks, the oldest and simplest form of lifting jack. They have two limitations in use, and so are rarely seen past the age of wooden carts. They have limited mechanical advantage, so can only lift a light load. Also they do not provide any locking, so the weight of the load always has to be supported by the operator.
Media in category "Lever jacks"
The following 4 files are in this category, out of 4 total.
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Hebelade in einer Darstellung von Johann Lorenz Böckmann (1769).png 730 × 602; 946 KB
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Hebelade Oeuvres d agriculture de M. de Planazu.png 1,200 × 990; 4.54 MB
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Houten wagenkrik, verstelbaar in hoogte, objectnr 60952-A-B.JPG 3,872 × 2,592; 2.17 MB
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Mémoires d'artillerie Surirey 79397.jpg 3,651 × 2,684; 1.95 MB
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