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Leaf Chains comprise several functions and are regulated by ANSI. They are intended for tension linkage, lift truck masts and for low-speed pulling, and as balancers between counterweight and head in some machine gadgets. Leaf chains are occasionally also referred to as Balance Chains.
Features and Construction
Leaf chains are actually steel chains with a simple link plate and pin construction. The chain number refers to the lacing of the links and the pitch. The chains have specific features like for instance high tensile strength for each section area, that allows the design of smaller machines. There are A- and B- type chains in this particular series and both the AL6 and BL6 Series have the same pitch as RS60. Lastly, these chains cannot be powered using sprockets.
Handling and Selection
In roller chains, the link plates maintain a higher fatigue resistance because of the compressive stress of press fits, yet the leaf chain just contains two outer press fit plates. On the leaf chain, the maximum allowable tension is low and the tensile strength is high. When handling leaf chains it is vital to consult the manufacturer's handbook in order to ensure the safety factor is outlined and utilize safety guards all the time. It is a good idea to exercise utmost caution and utilize extra safety guards in functions wherein the consequences of chain failure are severe.
Higher tensile strength is a direct correlation to the use of much more plates. As the use of much more plates does not improve the maximum acceptable tension directly, the number of plates could be restricted. The chains require frequent lubrication because the pins link directly on the plates, generating a very high bearing pressure. Making use of a SAE 30 or 40 machine oil is often advised for nearly all applications. If the chain is cycled more than 1000 times on a daily basis or if the chain speed is more than 30m for each minute, it will wear very rapidly, even with continuous lubrication. Thus, in either of these conditions using RS Roller Chains will be a lot more suitable.
The AL-type of chains should just be used under certain conditions like for instance when wear is not a big issue, when there are no shock loads, the number of cycles does not go beyond 100 day by day. The BL-type will be better suited under different conditions.
If a chain using a lower safety factor is chosen then the stress load in components would become higher. If chains are used with corrosive elements, then they can become fatigued and break somewhat easily. Doing frequent maintenance is really essential if operating under these types of conditions.
The kind of end link of the chain, whether it is an inner link or outer link, determines the shape of the clevis. Clevis connectors or also called Clevis pins are made by manufacturers but normally, the user supplies the clevis. A wrongly made clevis can lessen the working life of the chain. The strands should be finished to length by the producer. Refer to the ANSI standard or contact the maker.
In the new millennium, Skyjack was acquired by the Linamar Corporation, who is LNR on the TSX, a leading manufacturer of assemblies, precision-machined components and modules. At present, Skyjack has manufacturing facilities in Canada, Hungary and the United States with extra support offices in Europe and Asia.
Skyjack became the industry leader of aerial lift machinery by combining features such as serviceability, durability and quality, making their own scissor hoists recognized worldwide for product reliability and efficiency. Skyjack proudly produces a full line of self propelled scissor hoists. Their elevated work heights reach nearly fifty six feet. The company`s present Boom hoist model series has telescopic booms starting from 45 feet to 71 feet. Skyjack has plans to further expand their boom lift truck product line. The company is still a leading player in the trade adapting fast to the always changing requirements of all their clients.
Of late, Skyjack acquired Carelift Equipment in August 2007 and Volvo's Material Handling Equipment so as to try to expand their Telehandling product offering. The resulting Zoom Boom and VR series telehandlers together with the additional production capability further ensures the company`s growth and success.
