US 12,286,331 B2
Crane
Shingo Tanimoto, Aichi (JP); and Jacinda Ng, Aichi (JP)
Assigned to SUMITOMO HEAVY INDUSTRIES CONSTRUCTION CRANES CO., LTD., Tokyo (JP)
Filed by SUMITOMO HEAVY INDUSTRIES CONSTRUCTION CRANES CO., LTD., Tokyo (JP)
Filed on Sep. 4, 2020, as Appl. No. 17/012,790.
Application 17/012,790 is a continuation of application No. PCT/JP2018/008661, filed on Mar. 6, 2018.
Prior Publication US 2020/0399099 A1, Dec. 24, 2020
Int. Cl. E06C 5/24 (2006.01); B60R 3/00 (2006.01); B62D 55/06 (2006.01); B66C 13/00 (2006.01); B66C 23/62 (2006.01); B66C 23/74 (2006.01); E06C 5/02 (2006.01); E06C 7/48 (2006.01)
CPC B66C 23/62 (2013.01) [B60R 3/005 (2013.01); B60R 3/007 (2013.01); B62D 55/06 (2013.01); B66C 13/00 (2013.01); B66C 23/74 (2013.01); E06C 5/02 (2013.01); E06C 5/24 (2013.01); E06C 7/48 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A crane comprising:
a lower traveling body;
an upper turning body that is turnably provided on the lower traveling body;
a counterweight that is mounted on the upper turning body; and
a ladder for getting on and off the upper turning body,
wherein the ladder has:
an engagement member configured to engage with and disengage from an engaged portion provided at the upper turning body and a support portion that supports the engagement member; and
a restricting part configured to restrict a rotation range of the engagement member, comprising a long hole provided in one side of the engagement member, and a pin provided at the support portion, the pin being inserted into the long hole to limit the rotation range, and
a holding hole is provided on an arc passing through the long hole and having a center at a rotation fulcrum portion of the engagement member and the support portion, and the pin is selectively insertable into the long hole and the holding hole,
such that, when the engaged portion in a state of being engaged with the engagement member is moved downward with work of mounting the counterweight, the engagement member rotates with respect to the support portion to follow downward movement of the engaged portion.