Double-reeved lifting device with a rotary locking mechanism

Patent metadata

Field	Value
Publication number	US-11866309-B2
Application number	US-202117478835-A
Country	US
Kind code	B2
Filing date	Sep 17, 2021
Priority date	Sep 17, 2020
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A double-reeved lifting device includes a lower reeve block secured to a lifting hook and an upper reeve block, wherein the two reeve blocks include reversible connection means adapted to be reversibly configured between a connected configuration and a disconnected configuration. The reversible connection means include a locking mechanism and a complementary locking structure respectively having at least one striker orifice and a bolt slidably movable and supporting a locking finger adapted to rotatably cooperate with the striker orifice, and respective guide elements cooperating together so as to convert a relative approach and a relative distancing between the two reeve blocks into concomitants slidings and rotations of the bolt.

First claim

The invention claimed is:

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.

2. The double-reeved lifting device according to claim 1 , wherein the at least one locking finger extends orthogonally to the main axis, and the at least one striker orifice comprises a first oblong section along a direction perpendicular to the main axis and perpendicular to the at least one locking finger in the locking state.

3. The double-reeved lifting device according to claim 2 , wherein the at least one striker orifice comprises a second oblong section along a direction parallel to the main axis, disposed at the middle of the first oblong section.

4. 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 a sequence of the concomitant first rotation and of the concomitant second rotation leads to an overall rotation of the bolt at an overall angular amplitude that is equivalent to 90 degrees or to 90 degrees plus N times 180 degrees, N being an integer other than zero.

5. The double-reeved lifting device according to claim 4 , wherein the concomitant first rotation is performed at a first angular amplitude and the concomitant second rotation is performed at a second angular amplitude, wherein each of the first angular amplitude and the second angular amplitude are equivalent to 45 degrees.

6. 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 upp

Assignees

• Manitowoc Crane Group France

Inventors

• Chalavon Jonathan
• Gourru Adrien

Classifications

• B66D3/043 Primary

  Block and tackle system with variable number of cable parts · CPC title

• B66D3/06

  with more than one pulley · CPC title

• B66C23/88 Primary

  Safety gear (for cranes in general B66C15/00; for rope, cable, or chain winding mechanisms B66D1/54) · CPC title

• B66C23/62

  Constructional features or details (of dredgers E02F) · CPC title