- 1 9 9 0 s . ▁ ▁The ▁actu ator ▁forms ▁a ▁teles cop ing ▁tub ular ▁column , ▁or ▁sp ind le , ▁from ▁linked ▁segments ▁res emb ling ▁cur ved ▁par alle lo gram s . ▁ ▁The ▁teles cop ing ▁linear ▁actu ator ▁has ▁a ▁lif ting ▁capacity ▁up ▁to ▁ 2 0 0 ▁kg ▁( ~ 4 4 0 ▁pounds ) ▁for ▁a ▁travel ▁of ▁ 4 0 0 ▁mm ▁( ~ 1 5 . 7 5   in ches ). ▁ ▁A ▁short ▁el ong ated ▁housing ▁forms ▁the ▁base ▁of ▁the ▁actu ator ▁and ▁includes ▁an ▁elect rical ▁g ear ▁drive ▁and ▁storage ▁magazine ▁for ▁the ▁sp ind le ▁segments . ▁ ▁The ▁drive ▁sp ins ▁a ▁hel ically ▁gro oved ▁wheel ▁that ▁eng ages ▁the ▁similarly ▁gro oved ▁inside ▁face ▁of ▁the ▁sp ind le ▁segments . ▁ ▁As ▁the ▁wheel ▁sp ins ▁it ▁simultaneously ▁pull ▁the ▁segments ▁from ▁their ▁horizontal ▁arrangement ▁in ▁the ▁magazine ▁and ▁stack s ▁them ▁along ▁the ▁vertical ▁path ▁of ▁a ▁hel ix ▁into ▁a ▁rig id ▁tub ular ▁column . ▁ ▁The ▁reverse ▁process ▁low ers ▁the ▁column . ▁ ▁See ▁also ▁ ▁Hel ical ▁band ▁actu ator ▁ ▁R ig id ▁bel t ▁actu ator ▁ ▁R ig id ▁chain ▁actu ator ▁ ▁References ▁ ▁External ▁links ▁K ata ka ▁web ▁site ▁ ▁Category : Act u ators ▁Category : H ard ware ▁( me chan ical ) ▁Category : G ears <0x0A> </s> ▁Cad m ium ▁sul f