US 11,866,309 B2
Double-reeved lifting device with a rotary locking mechanism
Jonathan Chalavon, Mions (FR); and Adrien Gourru, Lyons (FR)
Assigned to MANITOWOC CRANE GROUP FRANCE, Dardilly (FR)
Filed by MANITOWOC CRANE GROUP FRANCE, Dardilly (FR)
Filed on Sep. 17, 2021, as Appl. No. 17/478,835.
Claims priority of application No. 2009401 (FR), filed on Sep. 17, 2020.
Prior Publication US 2022/0081266 A1, Mar. 17, 2022
Int. Cl. B66D 3/04 (2006.01); B66D 3/06 (2006.01)
CPC B66D 3/043 (2013.01) [B66D 3/06 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A double-reeved lifting device for a lifting machinery, the lifting device comprising two reeve blocks including a lower reeve block secured to a lifting hook and an upper reeve block, wherein the two reeve blocks comprise reversible connection means adapted to be reversibly configured between:
 a connected configuration in which the upper reeve block is connected to the lower reeve block so as to be able to accompany the lower reeve block in ascending/descending movements, and
 a disconnected configuration in which the upper reeve block is disconnected from the lower reeve block so as to be able to remain hanging above the lower reeve block such that the lower reeve block is configured to perform descending/ascending movements without the upper reeve block,
wherein the connected configuration and the disconnected configuration respectively correspond to a double-reeved configuration and to a simple-reeved configuration, or vice versa, of the double-reeved lifting device,
wherein the reversible connection means comprise a locking mechanism mounted on one of the two reeve blocks, and a complementary locking structure mounted on the other one of the two reeve blocks and adapted to cooperate with the locking mechanism;
wherein the complementary locking structure comprises a set forming a striker having at least one striker orifice, and the locking mechanism comprises a bolt mounted slidably movable along a spindle along a main axis and comprising at least one locking finger, wherein the bolt is also pivotally movable around the spindle and the main axis between:
a locking state, applied in the connected configuration, with the at least one locking finger inside the at least one striker orifice, and
an unlocking state, applied in the disconnected configuration, with the at least one locking finger out of the at least one striker orifice so as to enable a relative approach and a relative distancing between the two reeve blocks, and
wherein the locking mechanism and the complementary locking structure comprise respective guide elements cooperating together so as to convert a relative approach and a relative distancing between the two reeve blocks into concomitant slidings and rotations of the bolt,
wherein the complementary locking structure comprises a catch against which the bolt is configured to abut during a relative approach between the two reeve blocks for a sliding of the bolt in a first sliding direction, and the locking mechanism comprises an elastic biasing element, urging the bolt to slide in a second sliding direction, opposite to the first sliding direction,
wherein the respective guide elements comprise complementary guide elements provided on the locking mechanism so as to cooperate in sliding bearing in order to convert a sliding of the bolt in the first sliding direction into a concomitant first rotation of the bolt, and a sliding of the bolt in the second sliding direction into a concomitant second rotation of the bolt, and
wherein the concomitant first rotation and the concomitant second rotation are performed in a same rotational direction.