Lever block

Abstract

Disclosed is a lever block. The lever block comprises: a frame having a curved horseshoe shape; a shaft that passes through the frame and is rotatably connected to the frame; a first load sheave that is attached to the shaft and rotates according to the rotation of the shaft; a second load sheave which is coupled so as to be able to move relative to the load sheave and through which the shaft passes; a chain that moves while engaged with the first load sheave and the second load sheave; and a lower hook that is disposed on a portion of the chain and includes a groove for guiding the movement of the chain; an elastic member that is disposed between the second load sheave and the frame and elastically supports the first load sheave and the second load sheave; and an upper hook fixed to the upper portion of the frame.

Description

lever block

[0001] Examples of the present disclosure relate to a chain block. A chain block is a device for lifting a heavy object hung on a lower hook. The lever block may include a plurality of spur blocks, gears, and chains.

[0002] A roadblock is a simple crane designed to raise and lower a load attached to a lower hook attached to a chain as the chain is raised and lowered. A roadblock can be used as a simple crane, can be used to raise and lower loads, and can provide the force necessary to secure cargo loaded on a trailer.

[0003] The present invention can arrange a chain and a load sheave so as to provide a locking structure that mechanically prevents rotation of the lever block in order to prevent safety accidents that may occur when manually operating the lever block.

[0004] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0005] According to one embodiment, a lever block comprises: a frame having a curved horseshoe shape; a shaft penetrating the frame and rotatably connected to the frame; a first load sheave attached to the shaft and rotating in accordance with rotation of the shaft; a second load sheave movably coupled relative to the load sheave and through which the shaft passes; a chain that moves by being caught by the first load sheave and the second load sheave; a lower hook disposed on a portion of the chain and including a groove for guiding movement of the chain; and an elastic member disposed between the second load sheave and the frame, the elastic member elastically supporting the first load sheave and the second load sheave. An upper hook fixed to the upper portion of the frame; wherein the chain is wound in a first rotational direction with respect to the first load sheave, is wound in the first rotational direction with respect to the second load sheave, and extends toward a groove of the lower hook with respect to the first load sheave, and includes a first chain portion that is wound in the groove of the hook in the first rotational direction and extends toward the second load sheave, and a second chain portion that is wound in the first rotational direction around the second load sheave and extends toward the first load sheave, wherein the second load sheave is configured to be coupled with the first load sheave and suppress rotation of the first load sheave and the second sprocket by a force applied to the first chain portion, and is configured to be spaced apart from the first load sheave and provide a rotatable state of the first load sheave and the second load sheave.

[0006] In one embodiment, the lever block may include the first load sheave including a first engaging portion and the second load sheave including a second engaging portion facing the first engaging portion.

[0007] According to one embodiment, the first engaging portion includes a engaging groove that is engaged with the second engaging portion, the second engaging portion includes a protrusion that is inserted into the engaging groove, and the width of the engaging groove may be wider than the width of the protrusion so that the protrusion moves within the engaging groove.

[0008] In one embodiment, the second load sheave may be movable along the shaft to provide adjustment of the length of the first chain of the lever block.

[0009] In one embodiment, the second load shift may be configured to increase the first chain length by rotating in the first rotational direction.

[0010] According to one embodiment, the lever block can raise or lower a weight to a certain height or fix the support length of the lever block to ensure the safety of the worker and prevent the risk of the weight falling.

[0011] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0012] Figure 1 is a schematic diagram illustrating a lever block according to one embodiment.

[0013] Fig. 2 is a drawing showing the chain connection relationship of a lever block according to one embodiment.

[0014] FIG. 3 is a drawing showing a load shift and shaft of a lever block according to one embodiment.

[0015] FIG. 4 is a drawing showing the connection relationship between a first load sheave and a gear arranged on a shaft according to one embodiment.

[0016] FIG. 5 illustrates the relationship between the first load shift and the second load shift in the release state of the lever block according to one embodiment.

[0017] FIG. 6 shows the relationship between the first load shift and the second load shift in the locked state of the lever block according to one embodiment.

[0018] FIG. 7 is a drawing showing a lever block including a plurality of hooks according to one embodiment.

[0019] FIG. 8 illustrates the movement of the first hook and the second hook by the operation of the lever block of FIG. 7 according to one embodiment.

[0020] Fig. 9 is a schematic diagram illustrating a lever block according to another embodiment.

[0021] Fig. 10 shows the connection of a load sheave and a chain constituting a lever block according to another embodiment.

[0022] Figure 11 shows the arrangement of gears connected to the lever block.

[0023] The lever block can be used to manually lift and lower a load by hanging it on the lower hook, or automatically by a lever or motor. The lever block can be used to reduce the movement of loads loaded on a trailer.

[0024] Figure 1 is a schematic diagram illustrating a lever block according to one embodiment.

[0025] Referring to FIG. 1, the lever block (100) may include a frame (110), a shaft (120), a first load sheave (130), a second load sheave (140), a chain (150), a lower hook (170), an elastic member (180), and an upper hook (160).

[0026] In one embodiment, the frame (110) may have a curved horseshoe shape. The frame (110) may rotatably support the shaft (120). The frame (110) may be formed as a rigid body. The upper portion of the frame (110) may be connected to an upper hook (160). The upper hook (160) may be welded to the frame (110) or formed as an integral part thereof. In one embodiment, the upper hook (160) may be configured to rotate relative to the upward direction of the frame (110).

[0027] According to one embodiment, the shaft (120) can be rotated by being at least partially inserted into the frame (110). The shaft (120) can be configured to rotate together with the first load sheave (130), the second load sheave (140), and the connector (190). The shaft (120) can be formed as one piece, but is not limited thereto and can be formed as a plurality of pieces. In the present disclosure, the shaft (120) is described as being formed integrally, but the shaft (120) can separately include a first shaft connected to the first load sheave (130) and a second shaft connected to the second load sheave (140). The shaft (120) can be rotatably connected to the frame (110) by passing through a hole having a cross-sectional shape of the shaft (120) formed at both ends of the frame (110). The load sheave described herein can be referred to as a sprocket in terms of moving the chain (150) by being caught by the chain.

[0028] According to one embodiment, the first load sheave (130) can be connected to the shaft (120). The second load sheave (140) can be fixed to the shaft (120). The second load sheave (140) and the first load sheave (130) can be connected to each other. The second load sheave (140) is attached to (or fixed to) the shaft (120) and can rotate according to the rotation of the shaft. The first load sheave (130) is movably coupled with respect to the second load sheave (140), and the shaft (120) can pass through it. The second load sheave (140) can rotate according to the rotation of the shaft (120). The first load sheave (130) connected to the second load sheave (140) can rotate by the rotation of the second load sheave (140). A chain (150) can be wound on the surfaces of the first load sheave (130) and the second load sheave (140).

[0029] According to one embodiment, the chain (150) can raise and lower a weight hung on the lower hook (170) by the rotation of the first load sheave (130) and the second load sheave (140). The chain (150) can move according to the rotation of the first load sheave (130) and the second load sheave (140) by being hung on a chain groove formed on the surface of the first load sheave (130) and the second load sheave (140). The chain (150) can move by being hung on the first load sheave (130) and the second load sheave (140). The lower hook (170) may be arranged on a part of the chain (150) and may include a groove that guides the movement of the chain (150). The lower hook (170) may have a hook-shaped hook for connection with an external weight.

[0030] The elastic member (180) is disposed between the second load sheave (140) and the frame (110) to elastically support the first load sheave (130) and the second load sheave (140). When the second load sheave (140) is separated from the first load sheave (130), the elastic member (180) is compressed to a first state, and when the second load sheave (140) is coupled to the first load sheave (130), the elastic member (180) can be compressed to a lesser extent than the first state. The elastic member (180) can provide elastic force to maintain the coupled state of the first load sheave (130) and the second load sheave (140).

[0031] A connector (190) may be coupled to an end of a shaft (120). The connector (190) may be positioned outside the frame (110) and may rotate together with the shaft (120). The connector (190) may be coupled to a lever and may transmit rotational force provided through the lever to the shaft (120). In one embodiment, the connector (190) may be connected to a driving unit such as a motor.

[0032] According to one embodiment, the lever block (100) can operate as follows.

[0033] The rotational force transmitted through the lever or driving unit connected to the connector (190) can be transmitted to the shaft (120). The shaft (120) can rotate the second load sheave (140) based on the transmitted power. The first load sheave (130) can rotate based on the rotation of the second load sheave (140). Here, the first load sheave (130) is fixed to the second load sheave (140), and can rotate together with the second load sheave (140) by the rotational force transmitted to the second load sheave (140). The chain (150) hooked to the first load sheave (130) and the second load sheave (140) can move according to the rotation of the first load sheave (130) and the second load sheave (140). The lower hook (170) can be raised and lowered according to the movement of the chain (150).

[0034] Fig. 2 is a drawing showing the chain connection relationship of a lever block according to one embodiment.

[0035] Referring to FIG. 2, the chain (150) can be wound in the same rotational direction around the first load sheave (130) and the second load sheave (140). For example, the chain (150) can be wound in the first rotational direction (r1) around the first load sheave (130) and in the first rotational direction (r1) around the second load sheave (140).

[0036] According to one embodiment, the chain (150) may include a first chain portion (151) that extends toward the groove of the lower hook (170) based on the first load sheave (130), is wound around the groove of the lower hook (170) in the first rotational direction, and extends toward the second load sheave (140), and a second chain portion (152) that is wound around the second load sheave (140) in the first rotational direction (r1) and extends toward the first load sheave (130).

[0037] According to one embodiment, the second load sheave (140) may be configured to be coupled with the first load sheave (130) and to suppress rotation of the first load sheave (130) and the second load sheave (140) by a force applied to the first chain portion (151). The second load sheave (140) may be configured to be spaced apart from the first load sheave (130) and to provide a rotatable state of the first load sheave (130) and the second load sheave (140).

[0038] According to one embodiment, when the first load sheave (130) is coupled with the second load sheave (140), the weight of the weight connected to the lower hook (170) can be applied with the same force to both sides of the first chain portion (151). In this case, a rotational force can be applied to the first load sheave (130) in the first rotational direction (r1), and a rotational force can be applied to the second load sheave (140) in the opposite direction to the first rotational direction (r1). Since the rotational forces of the same magnitude are applied in opposite directions, the length of the first chain portion (151) can be maintained. Through this, the weight connected to the lower hook (170) can be fixed.

[0039] According to one embodiment, the second load sheave (140) may be movable along the shaft to provide adjustment of the length of the first chain (151) of the lever block (100). The second load sheave (140) may be configured to increase the first chain length (151) by rotating in the first rotational direction (r1).

[0040] According to one embodiment, in order to move a weight connected to the hook (170), one side of the first chain portion (151) may be pulled based on the lower hook (170), or force may be applied to a portion of the second chain portion (152) that contacts the first load sheave (130) or a portion of the second chain portion (152) that contacts the second load sheave (140). For example, when the portion of the second chain portion (152) that contacts the second load sheave (140) is pulled, the shaft (120) may move in the opposite direction to the first rotational direction (r1). When the shaft (120) rotates in the opposite direction to the first rotational direction (r1), the hook (170) may rise. For another example, when the portion of the second chain portion (152) that contacts the first load sheave (130) is pulled, the shaft (120) may rotate in the first rotational direction (r1). When rotated in the first rotation direction (r1), the hook (170) can be lowered.

[0041] FIG. 3 is a drawing showing a load shift and shaft of a lever block according to one embodiment.

[0042] FIG. 4 is a drawing showing the connection relationship between a first load sheave and a gear arranged on a shaft according to one embodiment.

[0043] Referring to FIGS. 3 and 4, the shaft (120) may include a gear (121) formed on the surface of the shaft (120) and a second load sheave (140) fixed to the shaft (120). The gear (121) and the second load sheave (140) fixed to the shaft (120) may rotate by the rotation of the shaft (120).

[0044] According to one embodiment, the first load sheave (130) may include a ring gear (131) formed on the inner surface of the first load sheave (130). When the first load sheave (130) is in contact with the second load sheave (140), the ring gear (131) may mesh with the gear (121). By the meshing of the ring gear (131) and the gear (121), the movement of the second load sheave (140) of the first load sheave (130) or the shaft (120) may be linked. The moving speed of the chain (150) may be controlled by the gear ratio of the ring gear (131) and the gear (121). In order to provide a high torque to lift a heavy load, the rotation speed of the first load sheave (130) may be reduced by adjusting the gear ratio.

[0045] The second load sheave (140) may include a second chain hook (141) on which a chain (150) may be hooked. The first load sheave (130) may include a first chain hook (133) on which a chain (150) may be hooked (e.g., the first chain hook (131) of FIGS. 5 and 6). Specific descriptions of the first chain hook (133) and the second chain hook (141) will be described later with reference to FIGS. 5 and 6.

[0046] Fig. 5 illustrates the relationship between the first load sheave and the second load sheave in the released state of the lever block according to one embodiment. Fig. 6 illustrates the relationship between the first load sheave and the second load sheave in the locked state of the lever block according to one embodiment.

[0047] Referring to FIGS. 5 and 6, the first load sheave (130) may include a first engaging portion (132), and the second load sheave (140) may include a second engaging portion (142) facing the first engaging portion (132).

[0048] According to one embodiment, the first engaging portion (132) may include an engaging groove that is engaged with the second engaging portion (142), and the second engaging portion (142) may include a protrusion that is inserted into the engaging groove. In order for the second engaging portion (142) or the protrusion to move within the engaging groove, the width of the engaging groove may be wider than the width of the protrusion. The first load sheave (130) and the second sprocket (140) are linked by the rotation of the gear (121) and the ring gear (131), but since their respective rotational speeds are different, the moving speeds of the chain (150) wound on the surfaces of the first load sheave (130) and the second load sheave (140) may be different. To compensate for this, the widths of the protrusion and the engaging groove may be formed differently. After rotating in the first direction, if the length margin of the chain (150) becomes insufficient, a part of the chain may escape the chain catch portion (133, 141), and another part of the chain connected to the part of the chain may be settled on the chain catch portion (133, 141).

[0049] According to one embodiment, FIG. 5 may be a first state in which the first catch portion (132) and the second catch portion (142) are spaced apart from each other, and FIG. 6 may be a second state in which the first catch portion (132) and the second catch portion (142) are connected.

[0050] In the first state, the first catch (132) and the second catch (142) are spaced apart from each other, and the first load sheave (130) can rotate freely while being separated from the shaft (120). In the first state, the chain (150) can be freely raised and lowered, and when a heavy object is connected to the lower hook (170), the first chain portion (151) of the chain (150) can move in the direction of gravity.

[0051] In the second state, the first engaging portion (132) and the second engaging portion (142) are connected to each other, so that the first load sheave (130) can rotate under limited conditions. The first engaging portion (132) and the second engaging portion (142) are connected, so that the ring gear (131) of the first load sheave (130) is connected to the gear (121), and can be interlocked with each other. That is, the shaft (120), the first load sheave (130), and the second load sheave (140) can rotate in interlock with each other. The weight connected to the lower hook (170) applies force in the same direction, so that the first load sheave (130) and the second load sheave (140) may not rotate due to the weight. In order to rotate the first load sheave (130) and the second load sheave (140), the second chain portion (152) can be pulled to provide lifting and lowering of a heavy object. As another example, a lever or driving unit can be connected through a connector (190) to provide rotation of the first load sheave (130) and the second load sheave (140) based on the rotation of the connector (190) and the shaft (120).

[0052] FIG. 7 is a drawing showing a lever block including a plurality of hooks according to one embodiment. FIG. 8 shows the movement of a first hook and a second hook by the operation of the lever block of FIG. 7 according to one embodiment.

[0053] Referring to FIG. 7, the chain (150) can be wound in the same rotational direction around the first load sheave (130) and the second load sheave (140). For example, the chain (150) can be wound in the first rotational direction (r1) around the first load sheave (130), and can be wound in the first rotational direction (r1) around the second load sheave (140).

[0054] According to one embodiment, the chain (150) may include a first chain portion (151) that extends toward the groove of the first hook (271) based on the first load sheave (130), is wound around the groove of the first hook (271) in the first rotational direction, and extends toward the second load sheave (140), and a second chain portion (152) that is wound around the second load sheave (140) in the first rotational direction (r1), is extended toward the groove of the second hook (272), is wound around the groove of the second hook (272) in the first direction, and extends toward the first load sheave (130).

[0055] According to one embodiment, the second load sheave (140) may be configured to be coupled with the first load sheave (130) and to suppress rotation of the first load sheave (130) and the second load sheave (140) by a force applied to the first chain portion (151). The second load sheave (140) may be configured to be spaced apart from the first load sheave (130) and to provide a rotatable state of the first load sheave (130) and the second load sheave (140).

[0056] According to one embodiment, when the first load sheave (130) is coupled with the second load sheave (140), the weight of the weight connected to the first hook (271) can be applied with the same force to both sides of the first chain portion (151). In this case, a rotational force can be applied to the first load sheave (130) in the first rotational direction (r1), and a rotational force can be applied to the second load sheave (140) in the opposite direction to the first rotational direction (r1). Since the rotational forces of the same magnitude are applied in opposite directions, the length of the first chain portion (151) can be maintained. Through this, the weight connected to the first hook (271) can be fixed.

[0057] Comparing FIGS. 7 and 8, the second load sheave (140) may be movable along the shaft to provide adjustment of the length of the first chain (151) of the lever block (100). The second load sheave (140) may be configured to increase the first chain length (151) by rotating in the first rotational direction (r1).

[0058] According to one embodiment, in order to move a weight connected to the first hook (271), one side of the first chain portion (151) may be pulled based on the first hook (271), or force may be applied to a portion of the second chain portion (152) that contacts the first load sheave (130) or a portion of the second chain portion (152) that contacts the second load sheave (140). For example, when the portion of the second chain portion (152) that contacts the second load sheave (140) is pulled, the shaft (120) may move in the opposite direction to the first rotational direction (r1). When the shaft (120) rotates in the opposite direction to the first rotational direction (r1), the first hook (271) may rise. For another example, when the portion of the second chain portion (152) that contacts the first load sheave (130) is pulled, the shaft (120) may rotate in the first rotational direction (r1). When rotating in the first rotation direction (r1), the first hook (271) can be lowered.

[0059] According to one embodiment, the second load sheave (140) may be movable along the shaft to provide adjustment of the length of the second chain (152) of the lever block (100). The second load sheave (140) may be configured to increase the second chain length (151) by rotating in a direction opposite to the first rotational direction (r1).

[0060] According to one embodiment, in order to move a weight connected to the second hook (272), one side of the second chain portion (152) may be pulled based on the second hook (272), or force may be applied to a portion of the first chain portion (151) that contacts the first load sheave (130) or a portion of the second chain portion (152) that contacts the second load sheave (140). For example, when the portion of the first chain portion (151) that contacts the second load sheave (140) is pulled, the shaft (120) may move in the first rotational direction (r1). When the shaft (120) rotates in the first rotational direction (r1), the second hook (272) may rise. For another example, when the portion of the first chain portion (151) that contacts the first load sheave (130) is pulled, the shaft (120) may rotate in the opposite direction to the first rotational direction (r1). When the shaft rotates in the opposite direction to the first rotation direction (r1), the second hook (272) can be lowered.

[0061] In a state as shown in Fig. 7, when a weight is connected to the first hook (271) and the shaft (120) is rotated in the first rotation direction (r1), the weight can rise. While the weight is rising, the first hook (271) can rise and the second hook (272) can descend, resulting in a state as shown in Fig. 8. Referring to Fig. 8, the second hook (272) can rise, but the distance that the first hook (271) can rise is limited or it may not rise at all. In a state as shown in Fig. 8, the second hook (272) can be connected to the weight, and the connection of the first hook (271) can be released. When the shaft (120) is rotated in a direction opposite to the first rotation direction (r1), the weight connected to the second hook (272) can rise again.

[0062] According to one embodiment, the lever block (100) can move a weight a specified distance using the first hook (271), and then move the weight additionally after replacing it with the second hook (272). Even when moving a distance greater than the specified distance, the lever block (100) can easily move the weight simply by replacing the first hook (271) and the second hook (272).

[0063] Fig. 9 is a schematic diagram illustrating a lever block according to another embodiment. Fig. 10 illustrates the connection of a load sheave and a chain constituting a lever block according to another embodiment. Fig. 11 illustrates the arrangement of gears connected to the lever block.

[0064] Referring to FIGS. 9, 10 and 11, the lever block (100) may include a frame (110), a shaft (120), a load sheave set (930), a gear set (940), a lower hook (170) and an elastic member (180), and an upper hook (160).

[0065] In one embodiment, the frame (110) may have a curved horseshoe shape. The frame (110) may rotatably support a shaft (120). The shaft (120) may be connected to a lobe sheave in a load sheave set (930) and a gear in a gear set (940). There may be a plurality of shafts (120). The frame (110) may be formed as a rigid body. The upper portion of the frame (110) may be connected to a top hook (160). The top hook (160) may be welded to the frame (110) or formed integrally with it. In one embodiment, the top hook (160) may be configured to rotate relative to an upward direction of the frame (110).

[0066] According to one embodiment, the shaft (120) can be rotated by being at least partially inserted into the frame (110). The shaft (120) can be configured to rotate together with one of the load sheaves constituting the load sheave set (930), one of the gears constituting the gear set (940) connected to the one lobe sheave, and the connector (190). The shaft (120) may be formed as one piece, but is not limited thereto and may be formed as a plurality of pieces. Although the present disclosure describes the shaft (120) as being formed as one piece, the shaft (120) may include a plurality of shafts to respectively connect the plurality of load sheave sets constituting the load sheave set (930). The shaft (120) can be rotatably connected to the frame (110) by penetrating a hole having a cross-sectional shape of the shaft (120) formed at both ends of the frame (110). The load sheave described here may be referred to as a sprocket in the sense that it moves the chain (150) by engaging it.

[0067] According to one embodiment, the first load sheave (130) can be connected to the shaft (120). The second load sheave (140) can be fixed to the shaft (120). The second load sheave (140) and the first load sheave (130) can be connected to each other. The second load sheave (140) is attached to (or fixed to) the shaft (120) and can rotate according to the rotation of the shaft. The first load sheave (130) is movably coupled with respect to the second load sheave (140), and the shaft (120) can pass through it. The second load sheave (140) can rotate according to the rotation of the shaft (120). The first load sheave (130) connected to the second load sheave (140) can rotate by the rotation of the second load sheave (140). A chain (150) can be wound on the surfaces of the first load sheave (130) and the second load sheave (140).

[0068] According to one embodiment, the chain (150) can raise and lower a weight hung on the lower hook (170) by the rotation of the load sheave set (930). The chain (150) can be hung on a chain groove formed on the surface of the load sheave constituting the load sheave set (930) and move according to the rotation of the load sheave. The chain (150) can be hung on the load sheave of the load sheave set (930) and move. The lower hook (170) may be arranged on a part of the chain (150) and include a groove that guides the movement of the chain (150). The lower hook (170) may have a hook-shaped hook for connection with an external weight.

[0069] According to one embodiment, a gear set (940) including at least one gear connected to at least one of the load sheaves in the load sheave set (930) may be connected to the shaft (120). The at least one gear of the gear set (940) may be rotated in accordance with the rotation of the load sheave. The gear set (940) may be configured to prevent the load sheave from rotating backward.

[0070] Referring to FIG. 11, a gear set (940) may include a plurality of gears (941-1, 941-2, 942-1, 942-2). Among the plurality of gears (941-1, 941-2, 942-1, 942-2), a first gear (941-1) and a second gear (941-2) may be connected to a load sheave (930-1, 930-2) through a first shaft (A1) and a second shaft (A2). For rotation of the load sheave (930-1, 930-2), the load sheave (930-1, 930-2) may be disconnected from the first gear (941-1) and the second gear (941-2). The connection between the gears and the load sheaves (930-1, 930-2) can be separated by an elastic member (180) or pressed and fastened by an elastic member (190). The gears (941-1, 941-2) can have a shape corresponding to the joint shape formed in the load sheaves (930-1, 930-2). The projections (or grooves) of the gears (941-1, 941-2) can be aligned with the grooves (or projections) of the load sheaves (930-1, 930-2) to be coupled.

[0071] A connector (190) may be coupled to an end of a shaft (120). The connector (190) may be positioned outside the frame (110) and may rotate together with the shaft (120). The connector (190) may be coupled to a lever and may transmit rotational force provided through the lever to the shaft (120). In one embodiment, the connector (190) may be connected to a driving unit such as a motor.

[0072] According to one embodiment, the lever block (100) can operate as follows.

[0073] The rotational power transmitted through the lever or driving unit connected to the connector (190) can be transmitted to the shaft (120). The shaft (120) can rotate the load sheave (930-1) based on the transmitted power. As the first load sheave (930-1) rotates, the second load sheave (930-2) rotates, and as the load sheaves rotate, the chain (150) hooked to the first load sheave (930-1) and the second load sheave (930-2) can move. As the chain (150) moves, the lower hook (170) can be raised and lowered. The first load sheave (930-1) and the second load sheave (930-2) can be connected to the first gear (941-1) and the second gear (941-2) so that their rotation can be restricted. The force for lowering the chain may be a clockwise force applied to the first load sheave (930-1) and a counterclockwise force applied to the second load sheave (930-2). When the same rotational force is transmitted to the first gear (941-1) and the second gear (941-2), the force applied by the first gear (941-1) to the third gear (942-1) or the fourth gear (942-2) may be the same as the force applied by the second gear (941-2) to the third gear (942-1) or the fourth gear (942-2). When the same force is applied in the opposite direction to the third gear (942-1) or the fourth gear (942-2), the rotation of the third gear (942-1) or the fourth gear (942-2) can be restricted, so that the first load sheave (930-1) and the second load sheave (930-2) can be connected to the gears and converted into a locked state. Although the above-described lever block (100) is expressed as one gear set (940) contacting one surface of the load sheave (930), it is not limited thereto and may further include another gear set (940) arranged on the other surface of the load sheave (930).

[0074] According to the above-described embodiment, the bur block comprises: a curved horseshoe-shaped frame; a shaft penetrating the frame and rotatably connected to the frame; a first load sheave attached to the shaft and rotating in accordance with rotation of the shaft; a second load sheave movably coupled relative to the load sheave and through which the shaft passes; a chain that moves by being caught by the first load sheave and the second load sheave; a lower hook disposed on a portion of the chain and including a groove for guiding movement of the chain; and an elastic member disposed between the second load sheave and the frame, the elastic member elastically supporting the first load sheave and the second load sheave. An upper hook fixed to the upper portion of the frame; wherein the chain is wound in a first rotational direction with respect to the first load sheave, is wound in the first rotational direction with respect to the second load sheave, and extends toward a groove of the lower hook with respect to the first load sheave, and includes a first chain portion that is wound in the groove of the hook in the first rotational direction and extends toward the second load sheave, and a second chain portion that is wound in the first rotational direction around the second load sheave and extends toward the first load sheave, wherein the second load sheave is configured to be coupled with the first load sheave and suppress rotation of the first load sheave and the second sprocket by a force applied to the first chain portion, and is configured to be spaced apart from the first load sheave and provide a rotatable state of the first load sheave and the second load sheave.

[0075] In one embodiment, the lever block may include the first load sheave including a first engaging portion and the second load sheave including a second engaging portion facing the first engaging portion.

[0076] According to one embodiment, the first engaging portion includes a engaging groove that is engaged with the second engaging portion, the second engaging portion includes a protrusion that is inserted into the engaging groove, and the width of the engaging groove may be wider than the width of the protrusion so that the protrusion moves within the engaging groove.

[0077] In one embodiment, the second load sheave may be movable along the shaft to provide adjustment of the length of the first chain of the lever block.

[0078] In one embodiment, the second load shift may be configured to increase the first chain length by rotating in the first rotational direction.

[0079] The various embodiments of this document and the terminology used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among those phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0080] The term "module" used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0081] According to various embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to various embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

Claims

1. In the lever block, A curved horseshoe shaped frame; A first shaft and a second shaft penetrating the frame and rotatably connected to the frame; A first load shift attached to the first shaft and rotating according to the rotation of the first shaft; A second load shift attached to the second shaft and rotating according to the rotation of the second shaft; A first gear rotatably connectable to the first shaft so as to be rotatable together with the first load shift; A second gear rotatably connectable to the second shaft so as to be rotatable together with the second load shift; A third gear meshing with the first gear and the second gear; A chain that moves while being caught by the first load shift and the second load shift; a lower hook disposed on a portion of the above chain and including a groove for guiding movement of the above chain; and comprising a top hook fixed to the upper part of the above frame; The above chain is, Winding along a part of the first load sheave, winding along a part of the second load sheave, The above lower hook is arranged on a part of the chain which is arranged between the first load sheave and the second load sheave, When the first load shift is connected to the first gear and the second load shift is connected to the second gear, the chain does not move by the third gear. Lever block.

2. In paragraph 1, When the first load sheave is separated from the first gear or the second load sheave is separated from the second gear, the chain moves. Lever block.

3. In paragraph 1, Further comprising an elastic member disposed between the first load shift and the first gear, or disposed between the second load shift and the second gear. Lever block.

4. In paragraph 1, When the above first load shift is separated from the above first gear, The first load sheave rotates in a first direction, and the second load sheave rotates in a second direction opposite to the first direction, so that the lower hook connected to the chain rises or falls. Lever block.

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