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Leaf Chains comprise several applications and are regulated by ANSI. They are designed for low-speed pulling, for tension linkage and lift truck masts, and as balancers between head and counterweight in some machine tools. Leaf chains are occasionally also referred to as Balance Chains.
Features and Construction
Constructed of a simple link plate and pin construction, steel leaf chains is identified by a number that refers to the pitch and the lacing of the links. The chains have specific features such as high tensile strength for every section area, which allows the design of smaller machines. There are A- and B- kind chains in this series and both the AL6 and BL6 Series comprise the same pitch as RS60. Lastly, these chains cannot be powered with sprockets.
Handling and Selection
Comparably, in roller chains, all of the link plates maintain higher fatigue resistance due to the compressive stress of press fits, while in leaf chains, only two outer plates are press fit. The tensile strength of leaf chains is high and the maximum permissible tension is low. If handling leaf chains it is essential to check with the manufacturer's instruction manual in order to guarantee the safety factor is outlined and utilize safety guards all the time. It is a better idea to exercise extreme caution and use extra safety guards in applications wherein the consequences of chain failure are severe.
Using a lot more plates in the lacing leads to the higher tensile strength. As this does not enhance the maximum permissible tension directly, the number of plates used could be restricted. The chains require regular 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 over one thousand times day by day or if the chain speed is more than 30m for every minute, it would wear very fast, even with constant lubrication. Therefore, in either of these situations utilizing RS Roller Chains will be much more suitable.
AL type chains are just to be used under certain situations such as where there are no shock loads or when wear is not really a big issue. Be certain that the number of cycles does not exceed one hundred each day. The BL-type will be better suited under other conditions.
The stress load in components will become higher if a chain using a lower safety factor is selected. If the chain is also utilized among corrosive conditions, it can easily fatigue and break very fast. Performing regular maintenance is really vital when operating under these types of conditions.
The outer link or inner link kind of end link on the chain would determine the shape of the clevis. Clevis connectors or Clevis pins are made by manufacturers, but the user normally provides the clevis. A wrongly made clevis can decrease the working life of the chain. The strands must be finished to length by the manufacturer. Refer to the ANSI standard or phone the manufacturer.
In the last decade, Skyjack was purchased by the Linamar Corporation, a leading producer of assemblies, modules and precision machined components. At present, Skyjack has production facilities in Canada, Hungary and the US with extra support offices in Asia and Europe.
The Skyjack trademark became a leader in the industry for aerial hoist machines by combining features such as durability, quality and serviceability, making their own scissor platform lifts recognized all over the world for product efficiency and reliability. Skyjack produces a lot of various self propelled aerial platform lifts for its worldwide client base. Their elevated work heights reach about 56 feet. The company`s present Boom lift model series has telescopic booms starting from 45 feet to 71 feet. Skyjack has plans to further extend their boom lift truck product line. The company remains a dominant player in the trade adapting rapidly to the continually evolving needs of their customers.
Skyjack`s purchase of Carelift Equipment was completed in August of the year 2007. Most recently, their purchase 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 production ability further ensures the company`s growth and success.
