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Used in various functions, leaf chains are regulated by ANSI. They could be used for lift truck masts, as balancers between heads and counterweight in several machine devices, and for tension linkage and low-speed pulling. Leaf chains are sometimes also called Balance Chains.
Construction and Features
Made of a simple link plate and pin construction, steel leaf chains is identified by a number which refers to the pitch and the lacing of the links. The chains have particular features such as high tensile strength for every section area, that allows the design of smaller mechanisms. There are A- and B- kind chains in this particular series and both the BL6 and AL6 Series comprise the same pitch as RS60. Lastly, these chains cannot be driven using sprockets.
Handling and Selection
Comparably, in roller chains, all of the link plates have higher fatigue resistance due to the compressive stress of press fits, whereas in leaf chains, only two outer plates are press fit. The tensile strength of leaf chains is high and the utmost permissible tension is low. When handling leaf chains it is essential to confer with the manufacturer's catalogue so as to guarantee the safety factor is outlined and use safety guards all the time. It is a good idea to apply utmost care and use extra safety measures in applications wherein the consequences of chain failure are severe.
Utilizing much more plates in the lacing results in the higher tensile strength. As this does not enhance the utmost allowable tension directly, the number of plates used can be restricted. The chains need frequent lubrication in view of the fact that the pins link directly on the plates, generating a really high bearing pressure. Making use of a SAE 30 or 40 machine oil is often advised for most applications. If the chain is cycled more than 1000 times on a daily basis or if the chain speed is over 30m per minute, it would wear really rapidly, even with continuous lubrication. Therefore, in either of these conditions the use of RS Roller Chains would be much more suitable.
The AL-type of chains should just 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 a hundred a day. The BL-type would be better suited under different situations.
If a chain using a lower safety factor is selected then the stress load in components will become higher. If chains are used with corrosive elements, then they could become fatigued and break rather easily. Performing regular maintenance is vital if operating under these kinds of situations.
The type of end link of the chain, whether it is an outer link or inner link, determines the shape of the clevis. Clevis connectors or likewise called Clevis pins are constructed by manufacturers but normally, the user provides the clevis. An improperly constructed clevis could decrease the working life of the chain. The strands must be finished to length by the producer. Check the ANSI standard or phone the producer.
In the new millennium, Skyjack was bought by the Linamar Corporation, who is LNR on the TSX, a leading manufacturer of assemblies, precision-machined components and modules. Today, Skyjack has manufacturing plants in United States, Canada and Hungary with added support offices in Europe and Asia.
The Skyjack trade name became the industry leader for aerial lift truck equipment by combining features such as quality, durability and serviceability, making their very own scissor hoists recognized all over the globe for product efficiency and reliability. Skyjack manufactures numerous various self propelled aerial hoists for its worldwide customer base. Their elevated work heights reach nearly 56 feet. The company`s existing Boom lift model series has telescopic booms ranging from 45 feet to 71 feet. Skyjack has plans to further expand their boom lift truck product line. The business is still a leading player in the industry adjusting fast to the continually evolving needs of their customers.
Skyjack`s purchase 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 VR series telehandlers and Zoom Boom along with the extra production capacity further guarantees the company`s success and growth.
