Patent ID: 9272844
Filing Date: 2016-03-01
CPC Classification: B65G,B66B,B66F

Claim Text:
1. A vertically moving device comprising: a spool mechanism for spooling at least two wires that are fed out to form loops; and a vertically movable work platform suspended by looped portions of the at least two wires fed out from the spool mechanism, wherein the vertically movable work platform includes: a scaffold portion having a walking surface for supporting at least one user; and at least four pulleys as wire-guiding rotating bodies over which the looped portions of the wires are run, wherein a looped portion of one of the wires is run over at least two of the wire-guiding rotating bodies, and a looped portion of the other of the wires is run over at least two other of the wire-guiding rotating bodies; wherein the vertically movable work platform is formed of a long rectangular member in a plan view, wherein the at least two of the wire-guiding rotating bodies are mounted to one longer side portion of two opposing longer side portions of the long rectangular member, wherein the at least two other of the wire-guiding rotating bodies are mounted to the other longer side portion of the two opposing longer side portions, wherein the at least two of the wire-guiding rotating bodies and the at least two other of the wire-guiding rotating bodies are mounted only to the two opposing longer side portions, wherein the at least two of the wire-guiding rotating bodies are mounted apart from each other on the longer side portion, and wherein the at least two other of the wire-guiding rotating bodies are mounted apart from each other on the other longer side portion, wherein the spool mechanism spools the at least two wires connected at both ends to the spool mechanism, and wherein the vertically moving device further comprises: two downwardly guiding rotating bodies for downwardly guiding the looped portion of the one of the wires toward each of the at least two of the pulleys as wire-guiding rotating bodies; additional two downwardly guiding rotating bodies for downwardly guiding the looped portion of the other of the wires toward each of the at least two other of the pulleys as wire-guiding rotating bodies; and a plurality of guide rails which are located in a neighboring area surrounding the vertically movable work platform and which are long in a vertical direction, wherein the vertically movable work platform includes a plurality of guided portions each of which contacts respective one of the plurality of guide rails, wherein vertical movement of the vertically movable work platform is guided by the guide rails with the guide rails and the guided portions in contact with one another, wherein each guided portion is formed of a cylindrical member with a collar portion provided on a circumference of a side face of the cylindrical member, wherein the guided portion rotates and advances on a side face of the guide rail with the guided portion abutting side faces of the guide rail from two different directions through the side face of the cylindrical member and the collar portion of the guided portion, whereby the vertical movement of the vertically movable work platform is guided by the guide rail while a relative displacement in a horizontal direction between the guided portion and the guide rail is restricted, wherein the one of the looped portions includes a first pair of downwardly oriented portions downwardly guided by the two downwardly guiding rotating bodies, and a first horizontally oriented portion connecting lower end portions of the first pair of downwardly oriented portions, the first pair of downwardly oriented portions being not overlapped with the vertically movable work platform in the plan view, and the other of the looped portions includes a second pair of downwardly oriented portions downwardly guided by the additional two downwardly guiding rotating bodies, and a second horizontally oriented portion connecting lower end portions of the second pair of downwardly oriented portions, the second pair of downwardly oriented portions being not overlapped with the vertically movable work platform in the plan view, wherein the spool mechanism is formed of four spool mechanisms which include a first spool mechanism configured to spool a first end of one of the looped portions, a second spool mechanism configured to spool a second end of the one of the looped portions, a third spool mechanism configured to spool a first end of the other of the looped portions, and a fourth spool mechanism configured to spool a second end of the other of the looped portions, and the four spool mechanisms are operatively connected by a pivot shaft so that they are rotatable in unison, and wherein the four spool mechanisms are coaxial with the pivot shaft.