Storage and retrieval machine with spring tensioned shuttle...

B - Operations – Transporting – 66 – F

Patent

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Details

B66F 9/07 (2006.01) B66F 9/14 (2006.01)

Patent

CA 2200819

A storage and retrieval machine has a telescopically extendible shuttle assembly and having spring tensioned shuttle idler pulleys for the slave drive members, preferably chains, of the shuttle assembly. A spring, preferably a die spring, exerts a biasing force on each idler pulley which opposes forces imposed on the idler pulley by the corresponding slave chain. Pre-tensioning the idler pulley in this manner assures adequate tension on the slave chain to prevent or at least inhibit undulations in plate movement which otherwise could occur during telescopic extension and retraction of the shuttle assembly if the slave chain were inadequately tensioned. Use of the spring loaded idler pulley also obviates the need to over-tension the slave chain and prevents or inhibits premature wear and failure of the idler pulley, pulley bearing, and/or chain.

Machine d'entreposage et d'extraction comportant une navette télescopique extensible comportant des poulies mobiles tendues par un ressort pour les éléments du mécanisme d'entraînement asservi, de préférence des chaînes, de la navette. Un ressort, de préférence un ressort matricé, exerce une force polarisée sur chaque poulie mobile et s'oppose aux forces imposées à la poulie mobile par la chaîne d'asservissement correspondante. Une telle précontrainte de la poulie mobile assure une tension adéquate de la chaîne d'asservissement pour prévenir, ou du moins inhiber, les ondulations pendant le déplacement des plaques, ondulations qui pourraient autrement se produire au cours de l'allongement télescopique ou de l'escamotage de la navette si la chaîne d'asservissement ne possédait pas la bonne tension. En utilisant la poulie mobile à ressort, on élimine également le besoin de trop contraindre la chaîne d'asservissement et on prévient ou inhibe l'usure et la défaillance prématurées de la poulie mobile, des portées des poulies et/ou de la chaîne.

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