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Chain tensioner on a single-speed bicycle Belt tensioner on a belt-drive bicycle Hydraulic bolt tensioner Hydraulic Puller-tensioner . A tensioner is a device that applies a force to create or maintain tension. The force may be applied parallel to, as in the case of a hydraulic bolt tensioner, or perpendicular to, as in the case of a spring ...
Chain-boat navigation [1] or chain-ship navigation [2] is a little-known chapter in the history of shipping on European rivers. From around the middle of the 19th century, vessels called chain boats were used to haul strings of barges upstream by using a fixed chain lying on the bed of a river.
When two chain boats met, a complicated evasive manoeuvre was required, with the downstream chain boat leaving the chain and allowing the upstream chain boat to pass. This manoeuvre meant a delay of at least 20 minutes for the towing convoy going up the river, while the ship going down the river lost about 45 minutes. [7] [8]
Chain boat and barges on the River Seine in France in the early 20th century. A chain boat, [1] [2] chain tug [3] or chain-ship [4] was a type of river craft, used in the second half of the 19th century and first half of the 20th century on many European rivers, [5] that made use of a steel chain laid along the riverbed for its propulsion.
Especially in medieval times, the end of a chain could be attached to a chain tower or boom tower. This allowed safe raising or lowering of the chain, as they were often heavily fortified. [ 1 ] By raising or lowering a chain or boom, access could be selectively granted rather than simply rendering the stretch of water completely inaccessible.
1. (ship's boat) A small, light boat propelled by oars or a sail, used as a tender to larger vessels during the Age of Sail. 2. (full-rigged pinnace) A small "race built" galleon, square-rigged with either two or three masts. 3. In modern usage, any small boat other than a launch or lifeboat associated with a larger vessel. pintle
An anchor windlass is a machine that restrains and manipulates the anchor chain on a boat, allowing the anchor to be raised and lowered by means of chain cable. A notched wheel engages the links of the chain or the rope. A trawl windlass is a similar machine that restrains or manipulates the trawl on a commercial fishing vessel.
Chain boat tow on the Main (ca. 1896) Chain boat of the Mainkette-AG in front of the "Mainkai" in Frankfurt After navigation on the Main had lost more and more of its transport capacity to the railway and the use of wheeled steam tugs had failed due to the shallow navigation channel of the Main, Heino Held, owner of the Mainz-based forwarding and coal trading company C.J.H. Held & Cie., had ...