US 12,434,947 B2
Handrail device and work machine comprising same
Keiko Inada, Hyogo (JP); Yasuo Ichikawa, Hyogo (JP); Tetsuya Kobatake, Hyogo (JP); and Takuya Watanabe, Hyogo (JP)
Assigned to KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima (JP)
Appl. No. 17/641,006
Filed by KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima (JP)
PCT Filed Mar. 18, 2020, PCT No. PCT/JP2020/011915
§ 371(c)(1), (2) Date Mar. 7, 2022,
PCT Pub. No. WO2021/053863, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 2019-171922 (JP), filed on Sep. 20, 2019.
Prior Publication US 2022/0340399 A1, Oct. 27, 2022
Int. Cl. B66C 23/62 (2006.01)
CPC B66C 23/62 (2013.01) 10 Claims
OG exemplary drawing
 
1. A handrail device to be provided in a boom included in a work machine, the boom including a plurality of unit booms to be connected to each other in a state of being aligned in a boom length direction that is a length direction of the boom, the plurality of unit booms including a first unit boom and a second unit boom that are adjacent to each other in the boom length direction, each of the first unit boom and the second unit boom including a right support pillar and a left support pillar which are spaced in a boom width direction which is a width direction of the boom, the width direction being orthogonal to the boom length direction, each of the right support pillar and the left support pillar extending in the boom length direction, and a plurality of pipes which extend in the boom width direction between opposite ends of the right support pillar in the boom length direction and opposite ends of the left support pillar in the boom length direction, respectively, to interconnect the right support pillar and the left support pillar, the handrail device comprising:
a pair of first poles spaced in the boom length direction in the first unit boom and extending from the first unit boom in a pole direction orthogonal to each of the boom length direction and the boom width direction;
a pair of second poles spaced in the boom length direction in the second unit boom and extending from the second unit boom in the pole direction;
a first main rope stretched between the pair of first poles;
a second main rope stretched between the pair of second poles;
a first pole support member fixed to a first fixation member selected among the right support pillar, the left support pillar and the plurality of pipes of the first unit boom and supporting a first pole that is closer to the second unit boom among the pair of first poles;
a second pole support member fixed to a second fixation member selected among the right support pillar, the left support pillar, and the plurality of pipes of the second unit boom and supporting a second pole that is closer to the first unit boom among the pair of second poles;
a first connection member fixed to the first fixation member;
a second connection member fixed to the second fixation member;
a first stay rope stretched between the first pole supported by the first pole support member and the second connection member; and
a second stay rope stretched between the second pole supported by the second pole support member and the first connection member.