Model of a Lifting Screw, Model of a screw duct in a stern with elliptical stern. The screw light device consists of a loose frame with a two-blade screw, which can be lifted up and down in the tube by a rope that runs over two discs at the top of the screw tube and two discs in the screw window. The propeller shaft has a hexagonal end that fits into the propeller. The propeller is disengaged by pulling the shaft into the ship, for which a lever mechanism driven by an endless gear with screw is fitted in the ship, the axle can be shortened by a telescopic section behind the gear. The screw
Model of a Lifting Screw, Model of a screw duct in a stern with elliptical stern. The screw light device consists of a loose frame with a two-blade screw, which can be lifted up and down in the tube by a rope that runs over two discs at the top of the screw tube and two discs in the screw window. The propeller shaft has a hexagonal end that fits into the propeller. The propeller is disengaged by pulling the shaft into the ship, for which a lever mechanism driven by an endless gear with screw is fitted in the ship, the axle can be shortened by a telescopic section behind the gear. The screw frame moves over vertical rails against the stern and the stern, which are provided with teeth, this includes catches of the screw window that prevent slipping back. The catches can be held back by pulling on two ropes, so that the screw window can be lowered. A beam placed against the stern and clamped with bolts blocks the movement of the screw window when it is lowered. The aim to prevent the screw from turning when being hoisted is mounted in the screw window and is controlled from above by a long auger-like socket wrench. The model is detailed down to the details as lubrication points and shows the ship's construction. The screw with its spherical hub is similar to a screw of Griffiths with changing pitch, but the blades are fixed. The propeller shaft is driven with a crank. 1:10 scale (derived)., Rijkswerf Vlissingen, Flushing, 1857, wood (plant material), brass (alloy), rope, h cm × w cm × d cm
Size: 6580px × 5366px
Location:
Photo credit: © Artokoloro / Alamy / Afripics
License: Licensed
Model Released: No
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