US 12,129,153 B2
Mobile crane
Tadatoshi Kamiya, 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 Dec. 20, 2019, as Appl. No. 16/723,335.
Claims priority of application No. 2018-239431 (JP), filed on Dec. 21, 2018.
Prior Publication US 2020/0198938 A1, Jun. 25, 2020
Int. Cl. B66C 13/16 (2006.01); B66C 13/50 (2006.01); B66C 15/06 (2006.01); B66C 23/36 (2006.01); B66C 23/72 (2006.01); B66C 23/84 (2006.01); B66C 23/90 (2006.01); B66C 23/94 (2006.01); G01C 9/00 (2006.01); G01G 19/14 (2006.01); G01L 5/04 (2006.01); G07C 5/08 (2006.01)
CPC B66C 13/16 (2013.01) [B66C 13/50 (2013.01); B66C 15/065 (2013.01); B66C 23/36 (2013.01); B66C 23/72 (2013.01); B66C 23/84 (2013.01); B66C 23/905 (2013.01); B66C 23/94 (2013.01); G01G 19/14 (2013.01); G07C 5/085 (2013.01); B66C 2700/0371 (2013.01); G01C 9/00 (2013.01); G01L 5/04 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A mobile crane comprising:
an undercarriage;
a turning body turnably supported by the undercarriage;
a boom derrickably supported by the turning body;
a derrick that causes the boom to perform a derricking operation;
a derricking force gauge that measures a derricking force by which the derrick causes the boom to perform the derricking operation;
a derricking angle sensor configured to detect a boom derricking angle A1 which is an angle formed by the boom relative to a first horizontal line perpendicular to gravity direction and extending a forward-rearward direction of the mobile crane;
an inclination angle sensor configured to detect a turning body inclination angle A2 which is an angle of the turning body relative to the first horizontal line; and
a controller,
wherein the controller is configured to
acquire a boom-to-ground angle A which is an angle around an axis about which the boom rotates due to the derricking operation relative to a ground where the undercarriage is disposed and which has a value changing according to an inclination of the ground, based on the boom derricking angle A1 and the turning body inclination angle A2,
calculate an actually suspended load W, based on the derricking force and the boom-to-ground angle A, and
restrict an operation of the mobile crane which exceeds a lifting performance, at least based on the calculated actually suspended load W.