Double wrap-around hoisting device with rotary locking mechanism

Abstract

A double pass-around lifting device with a rotary locking mechanism, comprising an upper pass-around block (4) and a lower pass-around block (3) fixed to a lifting hook, wherein the two pass-around blocks comprise reversible connection means adapted to be reversibly configured between a connection configuration and a disconnection configuration, comprising a locking mechanism (5) and a complementary locking structure (6), comprising at least one impact hole (65) and a bolt (52) respectively, which is slidably mobile and supports a locking finger (55) adapted to be rotatably engaged with the impact hole, and a respective guide element engaged together, so as to convert the relative approach and relative distancing between the two pass-around blocks into a concomitant sliding and rotation of the bolt.

Description

Technical Field

[0001] This invention relates to a double-through-loop lifting device for lifting machinery, as well as related lifting machinery and lifting methods.

[0002] This invention identifies a preferred application for lifting machinery (such as cranes, especially tower cranes), but is not limited thereto. Background Technology

[0003] In a known manner, a double-loop hoisting device is adapted to be reversibly configured between two loop configurations, including a simple loop configuration with two hoisting rope strands and a double-loop configuration with four hoisting rope strands, wherein the double-loop hoisting device includes a loop changing system for changing the loop configuration between the simple loop configuration and the double-loop configuration.

[0004] Traditionally, this type of double-through-hook lifting device includes two through-hook blocks, namely an upper through-hook block and a lower through-hook block fixed to the lifting hook, and the two through-hook blocks include a reversible connection device adapted to be reversibly configured between the following configurations:

[0005] - Connection configuration, wherein the upper winding block is connected to the lower winding block, thereby enabling the lower winding block to accompany the upward / downward movement, and

[0006] - Disconnect configuration, in which the upper winding block is disconnected from the lower winding block, thereby enabling it to remain suspended above the lower winding block, which can descend / ascend without being together with the upper winding block.

[0007] The lower winding block is suspended on the lifting machinery by a lifting rope connected to the lifting winch, so that the lower winding block rises / falls, and the lifting rope passes through the upper winding block, such that the connected configuration and disconnected configuration correspond to the double winding configuration and simple winding configuration of the double winding lifting device, respectively, or vice versa, depending on the passage of the lifting rope at the level of the upper winding block.

[0008] For example, documents FR 1 520 612, FR 2 137 333, FR 2 368 431, FR 2 131 924, and FR 2228024 describe a double-through hoisting device, wherein a connected configuration corresponds to a double-through configuration, and a disconnected configuration corresponds to a simple through configuration; the hoisting rope passes under a pulley carried by an upper through block.

[0009] Conversely, documents GB 2 176 456, FR 2 333 743, DE 31 49 690, and DE 35 43 214 describe double-through hoisting devices, in which a connected configuration corresponds to a simple through configuration, while a disconnected configuration corresponds to a double-through configuration; the hoisting rope passes over a pulley carried by an upper through block.

[0010] However, existing reversible connection devices for connecting / disconnecting two through blocks are far from satisfactory. In fact, some involve numerous parts that become loose, reducing the reliability of the mechanism and requiring extensive maintenance, not to mention the high manufacturing costs. Others require an attachment to activate the actuator, typically located at the cantilever root, limiting the possibility of replacing the through blocks at the cantilever root and creating accessibility problems if the cantilever root is in an inaccessible area of ​​the work site. Still others still require manual operation on the ground to connect / disconnect the through blocks, which can be dangerous and time-consuming if not performed correctly. Summary of the Invention

[0011] The present invention aims to address at least some of the aforementioned disadvantages by providing a double-through lifting device equipped with a robust reversible connection that is reliable over time, and which does not require any parts fastened to the cantilever to allow for through-through changes, thereby enabling such through-through changes regardless of the span or position of the lower through-through block along the cantilever.

[0012] The present invention also aims to provide a reversible connection device equipped with a locking mechanism having a movable part mounted only on one of the two through blocks, the other through block not including a movable part for connecting / disconnecting the two through blocks, which is advantageous in terms of maintenance and reliability.

[0013] The present invention also aims to reduce the size of the lifting device, particularly in a double-through configuration, in order to enhance the ability to move along the cantilever.

[0014] The present invention also aims to provide a double-threaded lifting device that allows for a reliable, rapid, and repeatable automatic switch over time from a double-threaded configuration to a simple-threaded configuration, and vice versa, without any human intervention.

[0015] Therefore, the present invention provides a double-through-hook lifting device for lifting machinery (such as a crane), comprising two through-hook blocks, namely an upper through-hook block and a lower through-hook block fixed to a lifting hook, wherein the two through-hook blocks include a reversible connecting device adapted to be reversibly configured between the following configurations:

[0016] - Connection configuration, wherein the upper winding block is connected to the lower winding block, thereby enabling the lower winding block to accompany the upward / downward movement, and

[0017] - Disconnected configuration, wherein the upper winding block is disconnected from the lower winding block, thereby allowing it to remain suspended above the lower winding block, which can descend / ascend without being together with the upper winding block.

[0018] The connection configuration and disconnection configuration correspond to the double-loop configuration and simple-loop configuration of the double-loop lifting device, respectively, and vice versa.

[0019] The notable feature of the double-through-the-loop lifting device is that the reversible connection device includes a locking mechanism mounted on one of the two through-the-loop blocks, and a complementary locking structure mounted on the other of the two through-the-loop blocks and adapted to cooperate with the locking mechanism.

[0020] The complementary locking structure includes a kit forming a striker having at least one impact hole, and a locking mechanism including a bolt mounted to be slidably movable along a spindle and a main axis, and including at least one locking finger, wherein the bolt is also pivotally movable about the spindle and the main axis between the following states:

[0021] - Locked state, applied in the connection configuration, where the locking fingers are within the considered impact hole, and

[0022] - In the unlocked state, applied in the disconnected configuration, the locking finger disengages from the considered impact hole, thereby enabling relative approach and relative distance between the two through blocks.

[0023] Furthermore, the locking mechanism and complementary locking structure include corresponding guiding elements that work together to convert the relative approach and relative distance between the two through blocks into the accompanying sliding and rotation of the bolt.

[0024] Therefore, the present invention provides a reversible connection device configured to convert the rising / falling motion (vertical translational motion) of the lower winding block into the rotational motion of the bolt. This will allow for easy connection / disconnection of two winding blocks, and to do so in a safe and reliable manner, because only a few movable parts are required, only the bolt is movable, and the winding change motion will also be allowed solely by the lifting motion that allows the lower winding block to rise / fall.

[0025] Therefore, it should be noted that by performing a locking rotation, the bolt switches from the locked state to the unlocked state, and by performing an unlocking rotation, the bolt switches from the unlocked state to the locked state, wherein raising / lowering the underpass block will enable the bolt to pivot.

[0026] Furthermore, the connection / disconnection phase can be easily automated, as all it requires is controlling the rising / falling motion of the lower winding block (by simply controlling the lifting motion, for example, by controlling the motor drive system of the lifting winch) to switch from the disconnected configuration to the connected configuration, and vice versa.

[0027] It should also be noted that the present invention allows for changes in the loop without requiring parts to be fastened to the cantilever, because the reversible connection is integrated into the two loop blocks, thereby allowing for changes in the loop anywhere along the cantilever.

[0028] In a particular embodiment, the complementary locking structure includes a latch that abuts against during relative proximity between the two through blocks for sliding in a first sliding direction, and the locking mechanism includes an elastic biasing element (e.g., a spring) that pushes the bolt to slide in a second sliding direction opposite to the first sliding direction.

[0029] Therefore, all that is needed is to raise / lower the undercarriage block so that the bolt is either adjacent to or not adjacent to the latch. The resilient bias element is used to resist the thrust exerted on the bolt by the latch, which makes the movement more reliable and allows for simple operation during the connection / disconnection phase.

[0030] According to one feature, the guiding element includes a complementary guiding element disposed on the locking mechanism, thereby cooperating in the sliding support to convert the sliding of the bolt in a first sliding direction into an accompanying first rotation of the bolt, and converting the sliding of the bolt in a second sliding direction into an accompanying second rotation of the bolt.

[0031] Therefore, when the bolt slides (through the action of the latch or resilient biasing element), the bolt pivots accordingly, thereby engaging or disengaging from the assembly forming the impactor. In this embodiment, it should be noted that the locking rotation is decomposed into a combination of a first rotation and a second rotation, and similarly, the unlocking rotation is also decomposed into a combination of a first rotation and a second rotation.

[0032] According to one variation, the locking rotation is performed in a single rotation, and similarly, the unlocking rotation is also performed in a single rotation.

[0033] According to one possibility, the first and second rotations occur in the same direction of rotation.

[0034] Therefore, all that is needed is to perform a first rotation and then a second rotation in sequence, and thus to slide the bolt in the first sliding direction and then in the second sliding direction in sequence, so that the bolt switches from the locked state to the unlocked state, and vice versa.

[0035] According to one variation, the first and second rotations occur in opposite directions.

[0036] According to another possibility, the order of the first and second rotations results in a total rotation of the bolt by a total angular magnitude equal to 90 degrees or equal to 90 degrees plus N times 180 degrees, where N is an integer other than zero.

[0037] Therefore, the sequence of the first rotation and the subsequent second rotation causes the bolt to pivot 90 degrees or 270 degrees, etc., so that the bolt is placed orthogonally.

[0038] Advantageously, the first rotation is performed with a first angular amplitude, and the second rotation is performed with a second angular amplitude, wherein both the first and second angular amplitudes are equal to 45 degrees.

[0039] Typically, the combination of the first and second angular amplitudes results in a total angular amplitude equal to 90 degrees or equal to 90 degrees plus N times 180 degrees, where N is an integer other than zero.

[0040] According to a specific embodiment, the locking mechanism includes:

[0041] - A mandrel that extends along the main axis and has a free end with a stop for the bolt;

[0042] - A bolt, mounted to be rotatably and slidably movable about a mandrel along a main axis, the bolt including at least one locking finger extending laterally relative to the main axis, wherein the bolt has a distal end facing a stop and a proximal end opposite the distal end; and

[0043] - An elastic biasing element, which is mounted on a spindle and supported on the proximal end of the bolt, so as to slidably push the bolt in the direction of the stop in the second sliding direction;

[0044] The complementary locking structure includes a locking housing, in which:

[0045] - The locking mechanism, when the two through blocks are relatively close, allows the distal end of the bolt to abut against the locking mechanism, pushing the bolt to slide in the direction of the complementary proximal guide element in the first sliding direction, against the elastic biasing element; and

[0046] - Kit, which forms an impactor having at least one impact hole;

[0047] Furthermore, the complementary guiding element includes:

[0048] - At least one proximal guide element disposed on the proximal end of the bolt and at least one complementary proximal guide element disposed on the mandrel, thereby cooperating with the proximal guide element in a sliding support so as to convert the sliding of the bolt in the direction of the complementary proximal guide element in the first sliding direction into an accompanying first rotation of the bolt when the two through blocks are relatively close to each other;

[0049] - At least one distal guide element disposed on the distal end of the bolt and at least one complementary distal guide element disposed on the spindle, thereby cooperating with the distal guide element in the sliding support so that when the two through blocks are relatively far apart, the displacement of the bolt in the direction of the stop and the complementary distal guide element in the second sliding direction is converted into the bolt's accompanying second rotation by the action of the elastic bias element.

[0050] According to one feature, the locking housing has a bottom wall in which an opening is formed for the free end of the spindle and its stop to pass through, the opening being defined by a periphery forming the latch.

[0051] According to another feature, the kit forming the impactor includes at least one lateral flange defining the locking housing, and an impact hole is provided in the lateral flange.

[0052] In one variant, the lateral flange extends parallel to the main axis.

[0053] According to one possibility, the bolt includes two locking fingers that face each other radially along the main axis, and the assembly forming the impactor includes two lateral flanges that face each other and are disposed on both sides of the latch, wherein two corresponding impact holes are disposed facing each other.

[0054] According to another possibility, the bolts include:

[0055] - An internal component mounted around a mandrel, wherein at least one distal guide element and at least one proximal guide element are disposed; and

[0056] - An outer sleeve surrounds the inner part, and at least one locking finger extends from the outer sleeve, wherein a resilient biasing element is supported on the outer sleeve.

[0057] Therefore, the outer sleeve protects the internal parts, including the distal and proximal guide elements of the internal parts.

[0058] Advantageously, at least one locking finger is fastened to the inner part and passes through the outer sleeve.

[0059] In other words, one or more locking fingers are fastened to the internal part and pass through the outer sleeve.

[0060] In an advantageous embodiment, at least one proximal guide element includes a plurality of proximal ramps continuously distributed around the main axis on the proximal end of the bolt, and at least one complementary proximal guide element includes one or more proximal locating pins extending radially on the mandrel so as to be slidably supported on one of the proximal ramps.

[0061] Similarly, at least one distal guide element includes a plurality of distal ramps continuously distributed around the main axis on the proximal end of the bolt, and at least one complementary distal guide element includes one or more distal locating pins extending radially on the mandrel so as to be slidably supported on one of the distal ramps.

[0062] According to one possibility, the proximal and distal inclined planes are inclined in opposite directions about the main axis, such that during the sliding transition of the bolt in the first and second sliding directions, respectively, the first and second rotations of the bolt occur in the same direction of rotation.

[0063] According to another possibility, at least one locking finger extends orthogonally to the main axis, and at least one impact hole includes a first elongated oval segment along a direction perpendicular to the main axis and perpendicular to the locking finger in the locked state.

[0064] This first elongated oval section helps to lock the angular displacement of the finger.

[0065] According to another possibility, at least one impact hole includes a second elongated oval section along a direction parallel to the main axis, the second elongated oval section being disposed in the middle of the first elongated oval section.

[0066] This second elongated circular section allows the bolt to follow during bolt sliding, and thus the locking fingers.

[0067] The present invention also relates to a lifting mechanism, such as a crane, comprising a cantilever and a double-loop lifting device configured to lift / lower a load along the cantilever, the double-loop lifting device being a double-loop lifting device according to the present invention, wherein a lower loop block is suspended on the cantilever by a lifting rope connected to a lifting winch to raise / lower the lower loop block, the lifting rope passing through an upper loop block, and wherein:

[0068] -Starting from the disconnected configuration where the upper through-hole block is suspended above the lower through-hole block and the bolt is in the unlocked state, the lower through-hole block can be displaced, causing the corresponding guide elements to engage, thereby allowing the bolt to slide and pivot to lock the bolt in a locked state, thus achieving the connection configuration; and

[0069] -Starting from the connection configuration where the bolt is in the locked position, the under-hook block can be displaced so that the corresponding guide elements cooperate together, thereby causing the bolt to slide and pivot to set the bolt to the unlocked state, thus achieving the disconnect configuration.

[0070] In terms of the extent to which the lifting winch allows the lower winding block to rise / fall, configuration changes between the connected and disconnected configurations (and therefore between the double winding configuration and the simple winding configuration) only occur when the lifting winch is controlled, thus giving the invention an advantageous simplicity.

[0071] In a specific embodiment:

[0072] -Starting from the disconnected configuration, the lower through-hole block can be raised to bring the two through-hole blocks closer together until the upper through-hole block reaches the high stop on the cantilever, and the bolt abuts against the latch to allow the bolt to slide in the first sliding direction and to allow the bolt to pivot into the first rotation of the bolt. Then, the lower through-hole block can be lowered so that the bolt is pushed by the resilient biasing element to slide in the second sliding direction and to pivot into the second rotation of the bolt, thereby setting the bolt in the locked state; and

[0073] -Starting from the connection configuration, the lower through-hook block can be raised until the upper through-hook block reaches the high stop on the cantilever, and the bolt abuts against the latch so that the bolt slides in the first sliding direction and the bolt pivots into the first rotation of the bolt. Then the lower through-hook block can be lowered so that the bolt is pushed by the elastic bias element to slide in the second sliding direction and pivots into the second rotation of the bolt, thereby setting the bolt in the unlocked state.

[0074] Advantageously, the lifting mechanism includes a distribution bracket movably mounted on the cantilever and connected to a distribution system adapted to move the distribution bracket along the cantilever in opposite forward and rearward directions, wherein the undercarriage block is suspended on the distribution bracket by a lifting rope.

[0075] The present invention also relates to a method for lifting a load in a lifting machine according to the present invention, comprising:

[0076] - A connection phase for switching from a disconnected configuration to a connected configuration, during which the underpass block is displaced, causing the corresponding guide elements to engage together to allow the bolt to slide and pivot, thereby locking the bolt in a locked state to achieve the connected configuration; and

[0077] - A disconnection phase for switching from a connected configuration to a disconnected configuration, during which the underpass block is displaced so that the corresponding guide element engages, thereby causing the bolt to slide and pivot to set the bolt in the unlocked state to achieve the disconnected configuration.

[0078] In a specific embodiment:

[0079] -Starting from the disconnected configuration, the lower through-hole block can be raised to bring the two through-hole blocks closer together until the upper through-hole block reaches the high stop on the cantilever, and the bolt abuts against the latch to allow the bolt to slide in the first sliding direction and to allow the bolt to pivot into the first rotation of the bolt. Then, the lower through-hole block can be lowered so that the bolt is pushed by the resilient biasing element to slide in the second sliding direction and to pivot into the second rotation of the bolt, thereby setting the bolt in the locked state; and

[0080] -Starting from the connection configuration, the lower through-hook block can be raised until the upper through-hook block reaches the high stop on the cantilever, and the bolt abuts against the latch so that the bolt slides in the first sliding direction and the bolt pivots into the first rotation of the bolt. Then the lower through-hook block can be lowered so that the bolt is pushed by the elastic bias element to slide in the second sliding direction and pivots into the second rotation of the bolt, thereby setting the bolt in the unlocked state.

[0081] Advantageously, the displacement of the underpass block is automatic during the connection and disconnection phases.

[0082] According to one variation, during the connection and disconnection phases, the displacement of the underpass block is driven at a decreasing speed below a predetermined speed threshold. Attached Figure Description

[0083] Other features and advantages of the invention will become apparent upon reading the following detailed description of non-limiting examples of implementations with reference to the accompanying drawings, in which:

[0084] Figure 1 This is a schematic perspective view of the double-through lifting device according to the invention when suspended on the distribution bracket, in a connected configuration (left side) and a disconnected configuration (right side);

[0085] Figure 2 yes Figure 1 A schematic perspective view of the upper winding block of the double-winding lifting device, in unexploded form (left) and exploded form (right), with the bolts enlarged at the bottom;

[0086] Figure 3 This is a schematic partial perspective view of the upper through-hole block, with some components being transparent and the bolts in the unlocked position;

[0087] Figure 4 It is different from Figure 3 A schematic partial perspective view of the overpass block from another angle, where some elements are transparent and the bolts are locked.

[0088] Figure 5 It is different from Figure 3 and Figure 4 A schematic partial perspective view of the overpass block from another angle, in which some elements are removed or transparent, and the bolts are locked.

[0089] Figure 6 It is a schematic partial perspective view of the upper winding block, in which some elements are removed or transparent, and the bolts are in the unlocked state;

[0090] Figure 7 It is different from Figure 6 A schematic partial perspective view of the overpass block from another angle, in which some elements are removed or transparent, and the bolts are in the unlocked state;

[0091] Figure 8 This is a schematic partial perspective view of the underpass block; for clarity, a flange has been removed.

[0092] Figure 9 yes Figure 1 A schematic partial perspective view of a double-through lifting device in a disconnected configuration, with the left side being an almost complete view and the right side being an enlarged view of the reversible connection device.

[0093] Figure 10 It is equivalent to Figure 9 The diagram is located in Figure 9 The first step of the disconnection phase begins after the disconnection configuration, during which the under-loop block is installed until the bolts abut against the latch;

[0094] Figure 11 It is equivalent to Figure 9 and Figure 10 The diagram shows the bolt in the middle of the first step of the disconnection phase, while the lower winding block continues its ascent, causing the bolt to begin its first rotation; and

[0095] Figure 12 It is equivalent to Figures 9 to 11 The diagram shows the end of the first step in the disconnection phase, while the lower winding block completes its rise, causing the bolt to terminate its first rotation.

[0096] Figure 13 It is equivalent to Figures 9 to 12 The diagram is in Figures 10 to 12During the second step of the disconnection phase following the first step, the underpass block begins to descend;

[0097] Figure 14 It is equivalent to Figures 9 to 13 The diagram shows the second step of the disconnection phase, in the middle of which the lower pass block continues to descend, causing the bolt to perform its second rotation, thereby achieving its locking state in the first elongated section of the impact hole.

[0098] Figure 15 It is equivalent to Figures 9 to 14 The diagram shows the end of the second step in the disconnection phase, while the lower winding block completes its descent, causing the bolt to rise in the second elongated oval section of the impact hole, thereby completing the connection between the winding blocks. Detailed Implementation

[0099] refer to Figure 1 The double-through lifting device 1 according to the invention is provided for lifting machinery, such as a crane, having a cantilever (not shown) and a distribution bracket 9 movably mounted on the cantilever and connected to a distribution system adapted to move the distribution bracket 9 along the cantilever in opposite forward and backward directions; the distribution system consists of, for example, a distribution winch that cooperates with a distribution rope to move the distribution bracket 9.

[0100] The double-threaded lifting device 1 includes two threading blocks 3 and 4, namely:

[0101] - A lower pass-through block 3, which is fixed to a lifting hook 30 designed to hook a load, wherein the lower pass-through block 3 is suspended from the distribution bracket 9 (and thus suspended from the cantilever) by a lifting rope (not shown) connected to a lifting winch, thereby raising / lowering the lower pass-through block 3; and

[0102] - The upper winding block 4 is through which the lifting rope passes, and the upper winding block 4 is also suspended on the distribution bracket 9.

[0103] Furthermore, the lower winding block 3 supports the lower rope deflection device, and the upper winding block 4 supports the upper rope deflection device, such as pulley 41, for the passage of the lifting rope. Therefore, the double-winding lifting device 1 is configured to lift / lower the load along the cantilever of the lifting machinery.

[0104] The two through-blocks 3 and 4 are equipped with a reversible connection device, which is suitable for reversibly configuring between the following configurations:

[0105] - Connection configuration (in) Figure 1 (Seen on the left), wherein the upper winding block 4 is connected to the lower winding block 3, thereby enabling the lower winding block to move up / down along a main axis having a vertical extension, and

[0106] - Disconnect configuration (in) Figure 1 (As shown on the right), the upper winding block 4 is disconnected from the lower winding block 3, so that it can remain suspended above the lower winding block 3. The lower winding block can move down / up independently without being together with the upper winding block 4.

[0107] Based on the passage of the lifting rope through the lower rope deflection device on the lower winding block 3 and the upper rope deflection device on the upper winding block 4, the connection configuration and disconnection configuration correspond to the double winding configuration and simple winding configuration of the double winding lifting device 1, respectively, and vice versa; the simple winding configuration is associated with the retention of the hook 30 (and thus the retention of the load) by the two lifting rope strands of the lifting rope, and the double winding configuration is associated with the retention of the hook 30 (and thus the retention of the load) by the four lifting rope strands of the lifting rope.

[0108] The upper stop 43 is supported at its upper portion by the through block 4. This upper stop is adapted to abut against the distribution bracket 9 when the upper through block 4 is at its high stop point on the cantilever (alone, not together with the lower through block 3). For this purpose, and as... Figure 1 As shown, a slot 90 is provided on the lower side of the distribution bracket 9, and the upper stop 43 is assembled and adjacent to the slot.

[0109] The reversible connection device includes a locking mechanism 5 mounted on the lower winding block 3 and a complementary locking structure 6 mounted on the upper winding block 4 and adapted to cooperate with the locking mechanism 5.

[0110] refer to Figure 8 The complementary locking structure 6 is part of the lower winding block 3 and is positioned above the lower rope deflection device, and thus above the two pulleys 31 in the illustrated example. The complementary locking structure 6 includes a frame 60 having two walls 61 facing each other. Figure 8 Only one wall 61 is shown, and a locking housing 62 is provided therein, which passes through the top of the downward-through-the-loop block 3, opposite the upper-through-the-loop block 4. It should be noted that two pulleys 31 are mounted between the walls 61.

[0111] The locking housing 62 is in the form of a groove with an elongated structure along the main axis (and therefore along the vertical direction), leading to the upper edge 63 of the frame 60.

[0112] The frame 60 includes a kit forming an impactor, provided with two lateral flanges 64 facing each other, the lateral flanges extending parallel to the main axis (and thus vertically) and orthogonal to the wall 61, wherein the two lateral flanges 64 laterally define a locking housing 62. Impact holes 65 are formed facing each other in the respective lateral flanges 64, such that the kit forming the impactor has two impact holes 65 facing each other.

[0113] The frame 60 also includes a bottom wall 66 in which an opening 67 is formed, the opening being defined by a periphery forming a latch 68. The bottom wall 66 extends between two lateral flanges 64, orthogonal to the main axis. Thus, the two lateral flanges 64 are located on both sides of the latch 68.

[0114] Each impact hole 65 has an inverted T-shaped general shape and includes a first elongated oval segment 651 along a direction perpendicular to the main axis and a second elongated oval segment 652 along a direction parallel to the main axis, the second elongated oval segment being disposed in the middle of the first elongated oval segment 651; wherein the second elongated oval segment 652 extends upward (in the direction of passing over the overlying block 4) from the middle of the first elongated oval segment 651.

[0115] refer to Figures 2 to 7 The locking mechanism 5 is part of the upper winding block 4, and an upper rope deflection device is provided below it (and therefore below the pulley 41 in the illustrated example). The locking mechanism 5 includes:

[0116] - A spindle 50, which is fixedly mounted on the upper winding block 4, extends along the main axis and has a free end with a stop 51 having an enlarged cross section;

[0117] - Bolt 52, which is mounted to be slidably movable about spindle 50 along the main axis and also pivotally movable about spindle 50 and the main axis, wherein the bolt 52 is positioned above the stop 51, thereby the stop forming a stop for the bolt 52;

[0118] - An elastic bias element 53 is mounted on a spindle 50 and pushes a bolt 52 to slide in the direction of a stop 51.

[0119] Bolt 52 has a distal end 521 facing the stop 51 and a proximal end 522 opposite to the distal end 521. The elastic biasing element 53 is in the form of a spring that is mounted around the spindle 50 and supported on the proximal end 522 of bolt 52 to push the bolt to slide in the direction of the stop 51 along the sliding direction (hereinafter referred to as the second sliding direction) (sliding downward in the illustrated example).

[0120] refer to Figure 2Bolt 52 includes an inner part 54 of cylindrical construction, which is mounted around a spindle 50 and adapted to slide along and rotate about the spindle 50. The inner part 54 supports two locking fingers 55 extending laterally (more specifically, orthogonally) to the main axis. The two locking fingers 55 are radially opposite each other relative to the main axis. Bolt 52 also includes an outer sleeve 56 surrounding the inner part 54, through which the two locking fingers 55 pass before extending outwardly from the outer sleeve 56. It should be noted that a resilient biasing element 53 is supported on the outer sleeve 56 via a cap 560. Each of the two locking fingers 55 may consist of a rod passing through the outer sleeve 56 and the inner part 54, but not fitted into the spindle 50 so as not to impede the sliding and rotation of bolt 52 about the spindle 50.

[0121] It should be noted that the assembly including the spindle 50 and bolt 52 is adapted to be fitted within the locking housing 62 of the complementary locking structure 6 during relative proximity between the two through blocks 3, 4, until the stop 51 is fitted into the opening 67 provided in the bottom wall 66. Then, the distal end 521 of the bolt 52 abuts against the periphery of the opening forming the latch 68, and thus the bolt 52 slides in the first sliding direction (upward in the illustrated example) by the thrust exerted by the latch 68. Furthermore, it should be noted that the opening 67 is sized to allow passage of the free end of the spindle 50 and its stop 51.

[0122] Conversely, in the absence of such a thrust applied to the bolt 52 by the latch 68, the resilient biasing element 53 pushes the bolt 52 to slide in a second sliding direction opposite to the first sliding direction (recall the downward sliding in the illustrated example) during the period when the two through blocks 3, 4 are relatively far apart.

[0123] Furthermore, the locking mechanism 5 includes complementary guide elements designed to cooperate in the sliding support so that:

[0124] - Convert the sliding of bolt 52 in the first sliding direction into an accompanying first rotation of bolt 52, and

[0125] - The sliding of bolt 52 in a second sliding direction opposite to the first sliding direction is converted into an accompanying second rotation of bolt 52.

[0126] These complementary guiding elements include means configured to convert the sliding of bolt 52 in the first sliding direction into an accompanying first rotation of bolt 52:

[0127] - A plurality of proximal bevels 57 formed on the inner part 54 at the level of the proximal end 522 of the bolt 52, more specifically, on the proximal peripheral edge of the inner part 54 (facing upward in the illustrated example), wherein these proximal bevels 57 are continuously distributed around the main axis and form proximal guide elements; and

[0128] Two proximal locating pins 570 extending radially from the spindle 50 are positioned facing the proximal end 522 of the bolt 52 (and thus positioned above the bolt 52 in the illustrated example), wherein these proximal locating pins 570 form complementary proximal guiding elements and are configured to be slidably supported on a proximal ramp 57 when the bolt 52 slides in a first sliding direction, such that the proximal ramp 570 will slide along the proximal locating pins 570 and thus will cause the bolt 52 to rotate into a first rotation.

[0129] These complementary guiding elements include means configured to convert the sliding of bolt 52 in the second sliding direction into an accompanying second rotation of bolt 52:

[0130] - A plurality of distal bevels 58 formed on the inner part 54, located at the level of the distal end 521 of the bolt 52, more specifically, on the distal peripheral edge of the inner part 54 (facing downward in the illustrated example), wherein these distal bevels 58 are continuously distributed around the main axis and form distal guide elements; and

[0131] Two distal locating pins 580 extending radially from the spindle 50 are positioned facing the distal end 521 of the bolt 52 (therefore positioned below the bolt 52 in the illustrated example), wherein these distal locating pins 580 form complementary distal guiding elements and are configured to be slidably supported on the distal ramp 58 when the bolt 52 slides in the second sliding direction, such that the distal ramp 58 will slide along the distal locating pins 580 and thus will cause the bolt 52 to rotate into the second rotation.

[0132] It should be noted that the shape, size, and positioning of the proximal bevel 57, distal bevel 58, proximal locating pin 570, and distal locating pin 580 cause the first and second rotations to occur in the same direction of rotation, with the first rotation occurring at a first angular amplitude of 45 degrees and the second rotation at a second angular amplitude of 45 degrees. Furthermore, the sequence of the first and second rotations results in a total rotation of bolt 52 at a total angular amplitude equal to 90 degrees.

[0133] Therefore, the proximal bevel 57 and the distal bevel 58 are inclined in opposite directions about the main axis, such that the first and second rotations of the bolt 52 occur in the same direction of rotation. In addition, the proximal bevel 57 and the distal bevel 58 each define a serrated profile on the respective proximal and distal peripheral edges of the inner part 54, having ridges (in the form of tips) and valleys.

[0134] As will be described later, bolt 52 can pivot about spindle 50 and main axis between the following states:

[0135] - Locked state (e.g.) Figures 2 to 5 As shown), it is applied in a connection configuration, wherein the locking finger 55 is adapted to extend within the impingement hole 65 of the consideration, and

[0136] -Unlocked status (e.g.) Figure 6 and Figure 7 As shown), it is applied in a disconnect configuration, wherein the locking finger 55 is adapted to extend away from the impact hole 65 under consideration, thereby enabling relative proximity and relative spacing between the two through blocks 3, 4.

[0137] In the unlocked state, the locking finger 55 extends parallel to the lateral flange 64, such that the assembly including the spindle 50 and the bolt 52 can be fitted into the locking housing 62 (when relatively close between the two through blocks 3, 4), and conversely, can be disengaged from the locking housing 62 (when relatively spaced between the two through blocks 3, 4), without the locking finger 55 abutting against the lateral flange 64.

[0138] In the locked state, compared to the unlocked state, the locking finger 55 is pivoted 90 degrees about the main axis, allowing the locking finger 55 to fit through the impingement hole 65 provided in the lateral flange 64.

[0139] Therefore, the complementary guiding elements (proximal ramp 57, distal ramp 58, proximal locating pin 570 and distal locating pin 580) together with the latch 68 and the resilient biasing element 53 form a corresponding guiding element to convert the relative proximity and relative spacing between the two through blocks 3, 4 into the accompanying sliding and rotation of the bolt 52, so that the bolt 52 switches from a locked state to an unlocked state and vice versa, and thus from a connected configuration to a disconnected configuration and vice versa.

[0140] The locking mechanism 5 also includes two slit walls 59 disposed on both sides of the spindle 50, each slit wall having a slot open at its bottom (facing downwards through the winding block 3), wherein the flared interface 590 is adapted to allow the frame 60 to be fitted into the slots of these slit walls 59 when the two winding blocks 3, 4 are relatively close together (e.g., Figure 10 (as shown), thereby promoting the alignment of the spindle 50 and bolt 52 with the locking housing 62 of the complementary locking structure 6.

[0141] refer to Figures 9 to 15 The following description covers the connection phase of switching from a disconnected configuration to a connected configuration.

[0142] refer to Figure 9 In the disconnected configuration, the upper through-arm 4 is suspended above the lower through-arm 3, with the lower through-arm 4 positioned at the high stop point on the cantilever. In this disconnected configuration, the bolt 52 is in its unlocked state due to the action of the elastic bias element 53, the distal locating pin 580 is at the bottom of the distal ramp 58, and the proximal locating pin 570 is away from the proximal ramp 57 and in front of the ridge of the proximal ramp (e.g., Figure 6 and Figure 7 (As shown).

[0143] To switch from the disconnected configuration to the connected configuration, the lower through-hole block 3 begins to rise, as indicated by arrow MO, so that the two through-hole blocks 3 and 4 are relatively close until the stop 51 is fitted into the opening 67 provided in the bottom wall 66 (as shown in the image). Figure 10 As shown), the distal end 521 of the bolt 52 then abuts against the periphery of the opening 67 forming the latch 68, so the bolt 52 slides in the first sliding direction by the thrust applied by the latch 68 (sliding upward in the illustrated example).

[0144] Due to this sliding of bolt 52 in the first sliding direction, the distal bevel 58 no longer contacts the distal locating pin 580; instead, the proximal bevel 57 begins to contact the proximal locating pin 570, thereby causing bolt 52 to pivot into a first rotation of 45 degrees, as... Figure 11 and Figure 12 As shown. At the end of the first rotation, the proximal locating pin 570 is at the bottom of the proximal ramp 57, and the distal locating pin 580 is away from the distal ramp 58 and in front of the ridge of the distal ramp.

[0145] refer to Figure 13 The lower pass-through block 3 then descends and shifts, as shown by arrow DE, so that the latch 68 descends together with the lower pass-through block 3, which allows the elastic bias element 53 to allow the bolt 52 to slide in the second sliding direction (sliding downward in the illustrated example).

[0146] Due to this sliding of bolt 52 in the second sliding direction, the proximal inclined surface 57 no longer contacts the proximal locating pin 570; instead, the distal inclined surface 58 begins to contact the distal locating pin 580, thereby causing bolt 52 to pivot into a second rotation of 45 degrees, as... Figure 13 and Figure 14 As shown. At the end of the second rotation, the distal locating pin 580 is at the bottom of the distal ramp 58, and the proximal locating pin 570 is away from the proximal ramp 57 and in front of the ridge of the proximal ramp (as shown). Figure 5(as shown), and the locking finger 55 is also fitted into the first elongated section 651 of the corresponding impact hole 65; the bolt 52 is then in its locked state.

[0147] refer to Figure 15 The lower through-hole 3 continues to descend and shift, as indicated by arrow DE, until the locking finger 55 is also fitted into the second elongated oval section 652 of the corresponding impact hole 65. Thus, the lower through-hole 3 and the upper through-hole 4 are connected, and the lower through-hole 3 can then continue its descent with the upper through-hole 4 in the connected configuration.

[0148] The following description covers the connection phase of switching from a connected configuration to a disconnected configuration.

[0149] To switch from the connected configuration to the disconnected configuration, the lower through-arm 3 (together with the upper through-arm 4) first rises until the upper through-arm 4 reaches its high stop on the cantilever, more specifically, until the upper stop 43 of the upper through-arm 4 abuts against the distribution bracket 9, where the upper stop 43 is fitted into a slot 90 located on the lower side of the distribution bracket 9. It should be noted that the bolt 52 is in its locked state, and the locking finger 55 is fitted within the second elongated oval section 652 of the corresponding impact bracket 65.

[0150] Once the upper winding block 4 is at its highest stop, the lower winding block 3 continues to rise, while the upper winding block 4 is blocked, causing the locking finger 55 to reach the first elongated oval section 651 of the corresponding impact hole 65. Then, the stop 51 is fitted into the opening 67 provided in the bottom wall 66, and then the distal end 521 of the bolt 52 abuts against the periphery of the opening forming the latch 68. Therefore, the bolt 52 slides in the first sliding direction (sliding upward in the illustrated example) by the thrust applied by the latch 68.

[0151] This sliding of bolt 52 in the first sliding direction causes bolt 52 to rotate 45 degrees, as described by the sliding contact between the proximal ramp 57 and the proximal locating pin 570.

[0152] In the second step, the lower through-hole block 3 is lowered and displaced, causing the latch 68 to descend with the lower through-hole block 3, which allows the elastic bias element 53 to allow the bolt 52 to slide in the second sliding direction.

[0153] This sliding of bolt 52 in the second sliding direction causes bolt 52 to rotate 45 degrees, as already described by the sliding contact between the distal ramp 58 and the distal locating pin 580.

[0154] At the end of these two 45-degree rotations, the locking finger 55 has pivoted 90 degrees and has completely disengaged from the corresponding impact hole 65; the bolt 52 is then in its unlocked state. Therefore, the lower through-hole block 3 and the upper through-hole block 4 are disconnected, and the lower through-hole block 3 can then continue to descend independently in the disconnected configuration without being with the upper through-hole block 4, which remains at the level of the distribution bracket 9.

[0155] Therefore, it should be noted that during the connection and disconnection phases, switching from the connection configuration to the disconnection configuration is only permitted by controlling the upward / downward movement of the lower winding block 3, and vice versa. Control of the upward / downward movement of the lower winding block 3 is performed by controlling the lifting winch.

[0156] Furthermore, it is advantageous to automatically shift the lower winding block 3 during the connection and disconnection phases using a monitoring / control unit that drives the lifting winch. In the context of automating the connection and disconnection phases, it is advantageous to provide one or more sensors that allow detection of the relative position between the lower winding block 3 and the upper winding block 4, such as sensors that allow detection of when the upper winding block 4 is at its high stop on the cantilever (more specifically, when the upper stop 43 of the upper winding block 4 abuts against the distribution bracket 9). In fact, this position represents the starting point of movement after the connection and disconnection phases.

[0157] Furthermore, by arranging the locking mechanism 5 on the lower through-hole block 3 and the complementary locking structure 6 on the upper through-hole block 4, the positions of the locking mechanism 5 and the complementary locking structure 6 of the reversible connection can be reversed. The locking mechanism 5 can also be operated using a single rotation of the bolt 52. Alternatively, it can be operated using other rotational amplitudes or directions of the bolt 52. It is also possible to provide an elastic biasing element 53 other than a spring, such as an elastic leaf, a return mechanism, or other equivalent device.

Claims

1. A double-loop lifting device (1) for lifting machinery, comprising two loop blocks (3, 4), namely an upper loop block (4) and a lower loop block (3) fixed to a lifting hook (30), wherein, The two through-blocks (3, 4) include a reversible connection device adapted to be reversibly configured between the following arrangements: - Connection configuration, wherein the upper through-wrap block (4) is connected to the lower through-wrap block (3), thereby enabling the lower through-wrap block to accompany the upward / downward movement, and - Disconnect configuration, wherein the upper winding block (4) is disconnected from the lower winding block (3), thereby enabling it to remain suspended above the lower winding block (3), and the lower winding block can move down / up without being together with the upper winding block (4). Among them, the connection configuration and the disconnection configuration correspond to the double-loop configuration and the simple loop configuration of the double-loop lifting device (1), respectively, and vice versa. The double-through-and-lift device (1) is characterized in that the reversible connection device includes a locking mechanism (5) mounted on one of the two through-and-lift blocks (3, 4) and a complementary locking structure (6) mounted on the other of the two through-and-lift blocks (3, 4) and adapted to cooperate with the locking mechanism (5). The complementary locking structure (6) includes a kit forming an impactor having at least one impact hole (65), and the locking mechanism (5) includes a bolt (52) mounted to be slidably movable along the main axis along the spindle (50), and includes at least one locking finger (55), wherein the bolt (52) is also pivotally movable about the spindle (50) and the main axis between the following states: - Locked state, applied in the connection configuration, wherein the locking finger (55) is within the considered impact hole (65), and - In the unlocked state, applied in the disconnected configuration, wherein the locking finger (55) is outside the impingement hole (65) of consideration, allowing the two through blocks (3, 4) to approach and move relatively far apart. The complementary locking structure (6) includes a latch (68) during relative proximity between the two through blocks (3, 4), during which the bolt (52) can abut against the latch for sliding in a first sliding direction, and the locking mechanism (5) includes an elastic biasing element (53) that pushes the bolt (52) to slide in a second sliding direction opposite to the first sliding direction; The locking mechanism (5) and the complementary locking structure (6) include corresponding guide elements that cooperate to convert the relative approach and relative distance between the two through blocks (3, 4) into the accompanying sliding and rotation of the bolt (52). The guiding element includes a complementary guiding element disposed on the locking mechanism (5) to cooperate in the sliding support so as to convert the sliding of the bolt (52) in the first sliding direction into the accompanying first rotation of the bolt (52), and to convert the sliding of the bolt (52) in the second sliding direction into the accompanying second rotation of the bolt (52). Furthermore, the complementary guiding element includes: - At least one proximal guide element (57) disposed on the proximal end (522) of the bolt (52) and at least one complementary proximal guide element (570) disposed on the spindle (50), thereby cooperating with the proximal guide element (57) in the sliding support so as to convert the sliding of the bolt (52) in the direction of the complementary proximal guide element (570) in the first sliding direction into an accompanying first rotation of the bolt (52) when the two through blocks (3, 4) are relatively close to each other; - At least one distal guide element (58) disposed on the distal end (521) of the bolt (52) and at least one complementary distal guide element (580) disposed on the spindle (50) thereby cooperating with the distal guide element (58) in the sliding support so that when the two through blocks (3, 4) are relatively far apart, the displacement of the bolt (52) in the second sliding direction in the direction of the stop (51) and the complementary distal guide element (580) is converted into an accompanying second rotation of the bolt (52) by the action of the elastic bias element (53).

2. The double-through lifting device (1) according to claim 1, wherein, The first rotation and the second rotation are performed in the same rotational direction.

3. The double-through lifting device (1) according to claim 1, wherein, The sequence of the first rotation and the second rotation results in the bolt (52) rotating in a total angular magnitude equal to 90 degrees.

4. The double-through lifting device (1) according to claim 3, wherein, The first rotation is performed with a first angular amplitude, and the second rotation is performed with a second angular amplitude, wherein both the first angular amplitude and the second angular amplitude are equal to 45 degrees.

5. The double-through lifting device (1) according to claim 1, wherein, The locking mechanism (5) includes: - A spindle (50) extending along the main axis and having a free end with a stop (51) for the bolt (52); - A bolt (52) mounted to be rotatably and slidably movable about a spindle (50) along a main axis, the bolt (52) including at least one locking finger (55) extending laterally relative to the main axis, wherein the bolt (52) has a distal end (521) facing a stop (51) and a proximal end (522) opposite the distal end (521); and - An elastic biasing element (53) is mounted on a spindle (50) and supported on the proximal end (522) of a bolt (52) to slidably push the bolt in the direction of the stop (51) in a second sliding direction; The complementary locking structure (6) includes a locking housing (62), which contains: -Lock (68), when the two through blocks (3, 4) are relatively close, the distal end (521) of the bolt (52) can abut against the lock, pushing the bolt (52) to slide in the direction of the complementary proximal guide element (570) in the first sliding direction against the elastic bias element (53); and - A kit that forms an impactor having at least one impact hole (65).

6. The double-through lifting device (1) according to claim 5, wherein, The locking housing (62) has a bottom wall (66) in which an opening (67) is formed for the free end of the spindle (50) and its stop (51) to pass through, the opening (67) being defined by a periphery forming a latch (68).

7. The double-through lifting device (1) according to claim 5, wherein, The assembly forming the impactor includes at least one lateral flange (64) defining the locking housing (62), and an impact hole (65) is provided in the lateral flange.

8. The double-through lifting device (1) according to claim 7, wherein, The bolt (52) includes two locking fingers (55) that are radially opposite each other relative to the main axis, and the assembly forming the impactor includes two lateral flanges (64) facing each other, the two lateral flanges being disposed on both sides of the latch (68), and in the two lateral flanges, two corresponding impact holes (65) are disposed facing each other.

9. The double-through lifting device (1) according to claim 1, wherein, The bolt (52) includes: - An internal component (54) mounted around a spindle (50) and having at least one distal guide element (58) and at least one proximal guide element (57) disposed thereon; and - An outer sleeve (56) surrounds the inner part (54), and at least one locking finger (55) extends from the outer sleeve, wherein an elastic biasing element (53) is supported on the outer sleeve (56).

10. The double-through lifting device (1) according to claim 9, wherein, The at least one locking finger (55) is fastened to the inner part (54) and passes through the outer sleeve (56).

11. The double-through lifting device (1) according to claim 1, wherein, The at least one proximal guide element (57) includes a plurality of proximal bevels continuously distributed around the main axis on the proximal end (522) of the bolt (52), and At least one complementary proximal guiding element (570) includes one or more proximal locating pins extending radially on the mandrel (50) so as to be slidably supported on one of the proximal ramps.

12. The double-through lifting device (1) according to claim 1, wherein, The at least one distal guide element (58) includes a plurality of distal bevels continuously distributed around the main axis on the proximal end (522) of the bolt (52), and At least one complementary distal guide element (580) includes one or more distal locating pins extending radially on the spindle (50) so as to be slidably supported on one of the distal ramps.

13. The double-through lifting device (1) according to claim 1, wherein, The at least one proximal guide element (57) includes a plurality of proximal ramps continuously distributed around the main axis on the proximal end (522) of the bolt (52), and the at least one complementary proximal guide element (570) includes one or more proximal locating pins extending radially on the spindle (50) so as to be slidably supported on one of the proximal ramps; The at least one distal guide element (58) includes a plurality of distal ramps continuously distributed around the main axis on the proximal end (522) of the bolt (52), and the at least one complementary distal guide element (580) includes one or more distal locating pins extending radially on the spindle (50) so as to be slidably supported on one of the distal ramps. Furthermore, the proximal inclined surface and the distal inclined surface are inclined in opposite directions about the main axis, such that during the sliding transition of the bolt (52) in the first sliding direction and the second sliding direction, respectively, the first rotation and the second rotation of the bolt (52) are performed in the same rotation direction.

14. The double-through lifting device (1) according to claim 1, wherein, The at least one locking finger (55) extends orthogonally to the main axis, and the at least one impact hole (65) includes a first elongated oval segment (651) along a direction perpendicular to the main axis and perpendicular to the locking finger (55) in the locked state.

15. The double-through lifting device (1) according to claim 14, wherein, The at least one impact hole (65) includes a second elongated oval section (652) along a direction parallel to the main axis, the second elongated oval section being disposed in the middle of the first elongated oval section (651).

16. A lifting mechanism comprising a cantilever and a double-through lifting device (1) configured to lift / lower a load along the cantilever, said double-through lifting device (1) being the double-through lifting device according to any one of the preceding claims, wherein, The lower winding block (3) is suspended from the cantilever by a lifting rope connected to the lifting winch, so that the lower winding block (3) rises / falls, the lifting rope passing through the upper winding block (4), and wherein: -Starting from the disconnected configuration where the upper through-hole block (4) is suspended above the lower through-hole block (3) and the bolt (52) is in the unlocked state, the lower through-hole block (3) can be displaced so that the corresponding guide elements cooperate together, thereby causing the bolt (52) to slide and pivot to set the bolt into the locked state, thus realizing the connection configuration; and -Starting from the connection configuration where the bolt (52) is in the locked position, the under-wrap block (3) can be displaced so that the corresponding guide elements cooperate together, thereby causing the bolt (52) to slide and pivot to set the bolt to the unlocked state, thereby achieving the disconnect configuration; And among them: -Starting from the disconnected configuration, the lower through-hook block (3) can be raised so that the two through-hook blocks (3, 4) are relatively close until the upper through-hook block (4) reaches the high stop on the cantilever and the bolt (52) abuts against the latch (68) so that the bolt (52) slides in the first sliding direction and the bolt pivots into the first rotation of the bolt (52) with the ground. Then the lower through-hook block (3) can be lowered so that the bolt (52) is pushed by the elastic bias element (53) to slide in the second sliding direction and pivots into the second rotation of the bolt (52) with the ground, thereby setting the bolt (52) in the locked state; and -Starting from the connection configuration, the lower through-hook block (3) can be raised until the upper through-hook block (4) reaches the high stop on the cantilever, and the bolt (52) abuts against the latch (68) so that the bolt (52) slides in the first sliding direction and the bolt pivots into the first rotation of the bolt (52) with the ground. Then the lower through-hook block (3) can be lowered so that the bolt (52) is pushed by the elastic bias element (53) to slide in the second sliding direction and pivots into the second rotation of the bolt (52) with the ground, thereby setting the bolt (52) in the unlocked state.

17. The lifting mechanism according to claim 16, comprising a distribution bracket (9) movably mounted on the cantilever and coupled to a distribution system adapted to displace the distribution bracket (9) along the cantilever in opposite forward and rearward directions, wherein, The lower winding block (3) is suspended on the distribution bracket (9) by a lifting rope.

18. A method for lifting a load in the lifting machinery according to claim 16, comprising: - A connection phase for switching from a disconnected configuration to a connected configuration, during which the underpass block (3) is displaced such that the corresponding guide elements engage together to allow the bolt (52) to slide and pivot simultaneously, thereby setting the bolt in a locked state and achieving the connected configuration; and - A disconnection phase for switching from a connected configuration to a disconnected configuration, during which the underpass block (3) is displaced so that the corresponding guide elements cooperate together, thereby causing the bolt (52) to slide and pivot to set the bolt in the unlocked state, thus achieving the disconnected configuration; And among them: - During the connection phase, the lower through-hook block (3) is raised so that the two through-hook blocks (3, 4) are relatively close until the upper through-hook block (4) reaches the high stop point on the cantilever and the bolt (52) abuts against the latch (68) so that the bolt (52) slides in the first sliding direction and the bolt pivots into the first rotation of the bolt (52) with the ground. Then the lower through-hook block (3) is lowered so that the bolt (52) is pushed by the elastic bias element (53) to slide in the second sliding direction and pivots into the second rotation of the bolt (52) with the ground, thereby setting the bolt (52) in the locked state. - During the disconnection phase, the lower through-hook block (3) is raised until the upper through-hook block (4) reaches the high stop on the cantilever, and the bolt (52) abuts against the latch (68) to allow the bolt (52) to slide in the first sliding direction and to allow the bolt to pivot into the first rotation of the bolt (52) with the ground. Then the lower through-hook block (3) is lowered so that the bolt (52) is pushed by the elastic bias element (53) to slide in the second sliding direction and to pivot into the second rotation of the bolt (52) with the ground, thereby setting the bolt (52) in the unlocked state.

19. The method for increasing load according to claim 18, wherein, During the connection and disconnection phases, the displacement of the underpass block (3) is automatic.

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