PROBLEM TO BE SOLVED: To provide a brake mechanism which can be operated by using either brake bar, maintains consistency of an operation method because a brake bar on a non-operation side operates in the same way, can be operated intuitively, and is easy to handle.SOLUTION: A first brake bar 72L constituting a brake mechanism 66L comprises: a first body part 78L having a first upper fulcrum 84L and a first lower fulcrum 86L； a first projection part 80L； and a first grip part 82L. A second brake bar 74L comprises: a second body part 96L having a second upper fulcrum 154L and a second lower fulcrum 156L； a second projection part 98L； and a second grip part 100L. The first projection part 80L and the second projection part 98L are pivotally attached to each other. A brake wire 76L energizes the first brake bar 72L or the second brake bar 74L so that the first upper and lower fulcrums 84L, 86L and the second upper and lower fulcrums 154L, 156L come into contact with an inside of a case 70L.SELECTED DRAWING: Figure 3
