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This specific example uses a level luffing mechanism to maintain the load at approximately the same vertical height as the jib moves through its range of travel. A jib or jib arm is the horizontal or near-horizontal beam used in many types of crane to support the load clear of the main support. [1] [2] An archaic spelling is gib. [3]
Working the grab requires extra cables from the crane jib, so requires a specialised design of crane throughout, not merely an attachment. Some grabs use 2 cables for lift and control, others use 4. In 1927, Stothert & Pitt of Bath, Somerset produced the first specialised bulk-handling crane. [1] This was to unload coal at Barking power station ...
The auxiliary crane is capable of lifting (or lowering) 70 t (77 short tons) at a radius up to 12 m (39 ft) down to 2,000 m (6,600 ft) below the waterline; capacity reduces to 25 t (28 short tons) at 60 m (200 ft) radius and 8 t (8.8 short tons) at 72 m (236 ft) radius. [7] Huisman provided the auxiliary crane as well. [13]
Stothert & Pitt's 15 ton crane for the Port Alfred harbour works. In 1881, Stothert and Pitt constructed a horizontal jib crane for Sir John Coode's harbour building work on the Kowie River at Port Alfred in South Africa. [6] This was a rail-mounted steam crane, with a fixed horizontal jib carrying a movable trolley or 'crab'.
The crane had three smaller hoists for lifting 10, 20 and 50 tons. The main hoist has two 125 tonne lifting units which could be coupled for a combined lift of 250 tonnes. The crane had a maximum jib tower height of 81.4 m. The crane is self-propelled with two propellers and floats on pontoons.
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The 1 + 1 ⁄ 4-ton, 4×4, Kaiser Jeep M715, sometimes called the "Five quarter (ton)", for its 1 + 1 ⁄ 4 (or 5 ⁄ 4) ton payload rating, is an American light military truck, based on the civilian Jeep Gladiator (SJ). Design and development for the M715 began in 1965, intended to replace the Dodge M37.