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Leaf Chains consist of various functions and are regulated by ANSI. They are intended for low-speed pulling, for tension linkage and lift truck masts, and as balancers between counterweight and head in certain machine devices. Leaf chains are at times also known as Balance Chains.
Construction and Features
Leaf chains are steel chains utilizing a simple pin construction and link plate. The chain number refers to the pitch and the lacing of the links. The chains have particular features like for instance high tensile strength per section area, that allows the design of smaller machines. There are A- and B- kind chains in this particular series and both the AL6 and BL6 Series comprise the same pitch as RS60. Finally, these chains cannot be driven with sprockets.
Handling and Selection
Comparably, in roller chains, all of the link plates have higher fatigue resistance because of the compressive stress of press fits, while in leaf chains, just two outer plates are press fit. The tensile strength of leaf chains is high and the utmost allowable tension is low. While handling leaf chains it is important to confer with the manufacturer's instruction manual so as to ensure the safety factor is outlined and utilize safety measures all the time. It is a good idea to carry out extreme care and utilize extra safety guards in applications where the consequences of chain failure are serious.
Using more plates in the lacing leads to the higher tensile strength. As this does not improve the most permissible tension directly, the number of plates used could be restricted. The chains need frequent lubrication because the pins link directly on the plates, generating a very high bearing pressure. Utilizing a SAE 30 or 40 machine oil is frequently advised for nearly all applications. If the chain is cycled more than 1000 times each day or if the chain speed is more than 30m for each minute, it would wear very rapidly, even with constant lubrication. So, in either of these conditions using RS Roller Chains would be much more suitable.
The AL-type of chains should only be utilized under certain situations like for example when wear is not a big issue, when there are no shock loads, the number of cycles does not go beyond one hundred on a daily basis. The BL-type will be better suited under different situations.
The stress load in components will become higher if a chain with a lower safety factor is selected. If the chain is also utilized among corrosive situations, it can easily fatigue and break really quick. Performing frequent maintenance is important if operating under these kinds of situations.
The inner link or outer link type of end link on the chain will determine the shape of the clevis. Clevis connectors or likewise known as Clevis pins are constructed by manufacturers, but the user typically provides the clevis. A wrongly made clevis can reduce the working life of the chain. The strands should be finished to length by the manufacturer. Refer to the ANSI standard or call the producer.
In the last decade, Skyjack was bought by the Linamar Corporation, a leading producer of assemblies, modules and precision machined components. Now, Skyjack has production plants in Canada, Hungary and the United States with additional support offices in Europe and Asia.
The Skyjack trademark became the industry leader for aerial lift truck machinery by combining features like for example durability, quality and serviceability, making their very own scissor hoists recognized around the globe for product reliability and efficiency. Skyjack produces many different self propelled aerial hoists for its worldwide client base. Their elevated work heights reach nearly 56 feet. The company`s present Boom lift model series has telescopic booms starting from forty five feet to seventy one feet. Skyjack has plans to further develop their boom lift product line. The company remains a leading player in the trade adjusting rapidly to the constantly evolving requirements of all their clients.
Skyjack`s acquisition of Carelift Equipment was done in August of the year 2007. Most recently, their acquisition of Volvo`s Material Handling Equipment business expands Skyjack`s Telehandler product offering. The resulting Zoom Boom and VR series telehandlers along with the added manufacturing ability further guarantees the company`s growth and success.
