Search results
Results from the WOW.Com Content Network
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.
Chebyshev linkages did not receive widespread usage in steam engines, [citation needed] but are commonly used as the 'Horse head' design of level luffing crane.In this application the approximate straight movement is translated away from the line's midpoint, but it is still essentially the same mechanism.
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]
Kirow Ardelt GmbH Eberswalde, referred to as Ardelt, is a German crane manufacturer. The company specialises in manufacturing double jib level luffing cranes which are based on the patented double jib principle. Ardelt has produced more than 4,700 harbour cranes. [1] Ardelt also makes single jib-level luffing cranes and balancer cranes.
The Meccano cranes are these because they are specifically level-luffing cranes and are contemporaneous with the initial development of such cranes. They indicate how this crane design (which some have already wanted to delete, through not knowing that it was different to other non-level cranes) was making it to the public perception of the ...
Lifting equipment can be assigned a Working Load Limit (WLL) in the interests of avoiding failure; Working Load Limit is calculated by dividing the Minimum Breaking Load of the equipment by a safety factor. [5] WLL as a concept is not restricted to lifting, being also relevant for mooring ropes. [6]
The operator's cabin hosts a display showing the tower crane's position, movement and operating area. Where the tower crane’s operating area overlaps with other cranes or prohibited zones these are also displayed. The system alerts the operator when the crane is approaching a prohibited area or another crane. [9]
In 2010 there were 37,476 injuries in work zones; about 20,000 of those were to construction workers. [47] Causes of road work site injuries included being struck by objects, trucks or mobile equipment (35%), falls or slips (20%), overexertion (15%), transportation incidents (12%), and exposure to harmful substances or environments (5%).