Hoisting device

Abstract

To provide a hoisting device of a novel structure capable of safely performing slinging and unslinging of a heavy load by only operating a crane, without requiring manual operations for preventing the load from coming off.SOLUTION: A hoisting device 1 includes a hook member 3, a first shaft 31 that rotatably supports the hook member 3, a second shaft 37 that is located above the first shaft 31 and serves as a fulcrum when hoisted by a crane, a hook support member 4 having an opening closing member 33 that closes an opening 17 of the hook member 3, and a spring member 6 that applies a biasing force to the hook member 3 so as to move the hook member 3 away from the opening closing member 33. When no load of a transported object is acting on the hook member 3, the first shaft 31 of the hook support member 4 is offset toward the opening 17 of the hook member 3 from a vertical line PL passing through the axis of the second shaft 37, so that the opening 17 of the hook member 3 is open sideways, and when the load of a transported object W is acting on the hook member 3, the opening 17 of the hook member 3 is closed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lifting device used when lifting a heavy object or the like with a crane. [Background technology]

[0002] The hook of a hoisting device used when lifting heavy objects with a crane is equipped with a device to prevent the wire, etc., hooked on the hook from coming off. In order for such a device to function, the worker must manually operate the device when rigging and removing the sling. However, depending on the work environment, it may be difficult for the worker to approach the hook from a safety standpoint.

[0003] In such cases, it is possible to operate the detachment prevention device remotely (see, for example, Patent Document 1 below), but even if it is possible to operate it remotely, the operation must be performed manually, which does not lead to a reduction in labor costs. For this reason, it is desirable to automate the manual work, but the structure will become more complex as new power sources such as pneumatic or hydraulic pressure are required, and new problems will arise in terms of operability and maintenance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-127911 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in view of the above circumstances, and has as its object to provide a lifting device with a new structure that eliminates the need for manual operations to prevent slinging, and enables the safe operation of slinging and removing heavy loads by operating a crane alone. [Means for solving the problem]

[0006] Thus, the sling device according to the first aspect of the present invention is defined as follows: A hook member for lifting the transported object; a hook support member for supporting the hook member, the hook support member having a first shaft for rotatably supporting a base end of the hook member, a second shaft located above the first shaft and serving as a fulcrum when the hook member is suspended by a crane, and an opening closing member located on a rotation trajectory of the hook member for closing an opening of the hook member; a spring member that applies a biasing force to the hook member so as to move a tip end portion of the hook member away from the opening closing member; Equipped with when the hook support member is suspended by a crane and no load of the transported object is acting on the hook member, the first shaft of the hook support member is offset toward an opening of the hook member from a vertical line passing through an axis of the second shaft, and the opening of the hook member is opened substantially horizontally, When the load of the transported object acts on the hook member, the opening closing member descends and the tip of the hook member rises to close the opening of the hook member.

[0007] According to the lifting device of the first aspect defined in this manner, the opening of the hook member is automatically closed when the load of the transported object is applied to the hook member (i.e., the anti-detachment function is activated), and the opening of the hook member is automatically opened when the load of the transported object is released from the hook member (i.e., the anti-detachment function is released). Therefore, manual operations for preventing detachment can be omitted and the rigging and removal work can be safely performed by operating the crane alone.

[0008] The second aspect of the present invention is defined as follows: In a first aspect of the present invention, a lifting device includes a lever body having a base end connected to either the hook support member or the hook member; a stopper member attached to the other of the hook support member or the hook member, The hook member has a lock mechanism that restricts relative rotation between the hook support member and the hook member by engaging a tip end of the lever body with the stopper member when the opening of the hook member is closed. According to the second aspect of the suspension device defined in this manner, when the transported object is light and the weight of the transported object alone is not sufficient to maintain the opening of the hook member in a closed state, the locking mechanism can be used to reliably prevent the object from coming loose.

[0009] The third aspect of the present invention is defined as follows: In a first aspect, the specified lifting device further includes a connecting member that is rotatably connected to the hook support member via the second shaft and has a third shaft at its tip end extending from the second shaft and hooked by a crane side member. According to the lifting device of the third aspect defined in this manner, it can be attached to various cranes by utilizing the wide space around the third axis.

[0010] The fourth aspect of the present invention is defined as follows: In the first aspect, in the specified suspension device, the mounting portion on the hook support member side and the mounting portion on the hook member side of the spring member are each attached to a mating member in an internal space formed between a pair of opposing plate members. According to the suspension device of the fourth aspect defined in this manner, the mounting portion of the spring member is prevented from being exposed to the outside, thereby making it possible to avoid equipment problems such as damage or detachment of the spring member due to contact with surrounding parts during transportation. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing the overall configuration of a sling device according to an embodiment of the present invention, illustrating a state in which the load of a transported object is not acting on the hook member. [Diagram 2] FIG. 2 is a diagram showing the overall configuration of the sling device, illustrating a state in which the load of a transported object is acting on the hook member. [Diagram 3] 3 is a cross-sectional view taken along a vertical line of the sling device of FIG. 2. [Figure 4] 4 is a view taken along line IV-IV of the sling device in FIG. 2. [Diagram 5] 5A to 5C are explanatory diagrams illustrating the operation of the sling device of the embodiment. [Figure 6] 6 is an explanatory diagram of the operation of the sling device following FIG. 5. [Figure 7] 7 is an explanatory diagram of the operation of the sling device following FIG. 6. [Figure 8] 13A and 13B are diagrams showing a modified example further including a locking mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Next, a suspension device according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following, when describing the positional relationship and direction of operation of the hoisting device, the "up-down direction" is specified based on the state in which the hoisting device is suspended by a crane. In addition, the open side of the hook member where the transported object is hung and detached is referred to as the "front," and the side that is curved and closed in an approximately C-shape is referred to as the "rear," and the "front-rear direction" and "left-right direction" are specified based on the direction in which the hook is viewed from the front side to the rear side.

[0013] Fig. 1 is a diagram showing the overall configuration of a hoisting device according to one embodiment of the present invention. The hoisting device 1 in the figure is configured to include a hook member 3, a hook support member 4, a connecting member 5, and a spring member 6. This hoisting device 1 is used in a state in which it is suspended by a crane hook 9, which is a crane side member.

[0014] The hook member 3 includes a hook body 11 and a bracket 19 that covers a portion of the hook body 11 from the outside. The hook body 11 includes a base end 12, a curved portion 13, and a tip end 14. The curved portion 13 is an arc-shaped portion with one end contacting the base end 12 and the other end contacting the tip end 14. Between the base end 12 and tip end 14 of the hook body 11, an opening 17 is formed to allow a hanging handle Wa (see FIG. 5) of the transported load W to pass through when slinging and unslinging.

[0015] Bracket 19 is configured to include a pair of plate materials 20a, 20b (see FIG. 4), and is placed so as to sandwich and cover the portion of hook body 11 from the base end 12 to the curved portion 13 from both side surfaces. The pair of plate materials 20a, 20b of bracket 19 are connected at their ends extending to the curved portion 13 of hook body 11 via a connecting pin 21. In addition, bracket 19 is provided with a spring mounting pin 23 to which one end of spring member 6 is attached so as to straddle the plate materials 20a, 20b (see FIG. 4).

[0016] As shown in FIG. 2, the bracket 19 is integrally connected to the hook body 11 by a knock pin 22 which penetrates the plate materials 20a, 20b and the hook body 11 in the thickness direction. The hook member 3 of this example configured as above has its base end portion supported by a first shaft 31 of the hook support member 4 so as to be freely rotatable.

[0017] The hook support member 4 includes a pair of main plates 30a, 30b arranged opposite each other with a gap therebetween. A first shaft 31 is provided at the bottom of the hook support member 4, penetrating the pair of main plates 30a, 30b in the plate thickness direction. As shown in Fig. 3, both ends of the first shaft 31 are supported by the pair of main plates 30a, 30b, and the base end of the hook member 3 is fitted onto the first shaft 31 via a bush 32 in the space between the pair of main plates 30a, 30b.

[0018] An opening closing member 33 is provided in the space between the pair of main plates 30a, 30b on the front side of the hook support member 4. The opening closing member 33 is plate-shaped, and both left and right ends thereof are integrally joined to the pair of main plates 30a, 30b, respectively. This opening closing member 33 is located on the rotation trajectory of the hook member 3 shown by the two-dot chain line in Fig. 1, and closes the opening 17 of the hook member 3 when the hook support member 4 rotates counterclockwise in the figure (see Fig. 2).

[0019] A spring mounting pin 35 is provided on the rear side of the hook support member 4. As shown in Fig. 4, the spring mounting pin 35 is provided penetrating the pair of main plates 30a, 30b in the plate thickness direction, and one mounting portion 6a of the spring member 6 is attached to this spring mounting pin 35. The other mounting portion 6b of the spring member 6 is attached to the spring mounting pin 23 on the hook member 3 side. This spring member 6 is a tension spring, and applies a biasing force to the hook member 3 so as to move the tip portion 14 of the hook member 3 away from the opening closing member 33 of the hook support member 4, for example, as shown by the arrow in Fig. 7(IV).

[0020] As shown in Fig. 1, a second shaft 37 is disposed above the first shaft 31 of the hook support member 4. At the top of the hook support member 4, as shown in Fig. 3, a cylindrical member 38 is disposed between the pair of main plates 30a, 30b and is integrally joined to the main plates 30a, 30b, and the second shaft 37 is inserted together with a bush 39 into a through hole passing through the cylindrical member 38 and the pair of main plates 30a, 30b.

[0021] One end of the connecting member 5 (the lower end of the connecting member 5) engages with both ends of the second shaft 37, which extends outward in the left-right direction beyond the pair of main plates 30a, 30b, and the hook support member 4 and the connecting member 5 are connected to each other so as to be freely rotatable via the second shaft 37. This connecting member 5 is a member that is directly hooked by the hook 9 of the crane, and the other ends of the pair of plate materials 41a, 41b (the upper ends in the figure opposite the second shaft 37) are connected by a third shaft 42, and this third shaft 42 is hooked to the hook 9 of the crane.

[0022] In the hoisting device 1 of this embodiment configured as described above, when it is suspended by a crane and the load of the transported load W is not acting on the lower hook member 3, the lower surface of the opening closing member 33 extends substantially horizontally as shown in Fig. 1. In addition, the weight balance of the hook support member 4 is adjusted so that the first shaft 31 of the hook support member 4 is off-centered toward the opening 17 of the hook member 3 with respect to the vertical line PL passing through the axis of the second shaft 37. For example, if necessary, it is also possible to attach a balance weight 40 to the hook support member 4 as shown by the two-dot chain line in Fig. 1.

[0023] Furthermore, when the load of the transported object W is not acting on the hook member 3, as shown in Figure 1, the hook member 3 is in a state where its own weight is balanced with the biasing force of the spring member 6, and the opening 17 of the hook member is open approximately sideways, and the hanging handle Wa of the transported object W (see Figure 5) can be hung on the hook member 3 through this opening 17.

[0024] Next, a series of transport operations using the hoisting device 1 will be described with reference to Figs. First, as shown in Figure 5 (I), the lifting device 1 is hung on the hook 9 of the crane and lifted up, and the crane is operated to bring the lifting device 1 closer to the transported load W and align the height of the opening 17 of the hook member 3 with the hanging handle Wa of the transported load W, and the hanging handle Wa is hung on the hook member 3 through the opening 17 which is opened approximately horizontally.

[0025] Next, when the load W is lifted by the crane operation and the load of the load W acts on the hook member 3, the hook support member 4 rotates counterclockwise around the second shaft 37, the first shaft 31 moves toward the vertical line PL, and the opening closing member 33 of the hook support member 4 descends, as shown in FIG. 6(II). Meanwhile, the hook member 3 rotates clockwise around the first shaft 31 against the biasing force of the spring member 6. Based on these operations, the opening 17 of the hook member 3 is closed, as shown in FIG. 6(III). The series of rotational operations for closing the opening 17 ends when the first shaft 31 moves to the vertical line PL passing through the axis of the second shaft 37. Thus, according to the lifting device 1 of this embodiment, the opening 17 of the hook member 3 is automatically closed immediately after the load W is lifted, and thereafter, the detachment of the hanging handle Wa from the hook member 3 during transportation is prevented.

[0026] Next, after the transported object W reaches the destination, the transported object W is lowered to the floor surface by the crane operation, and when the load of the transported object W is no longer acting on the hook member 3, as shown in Fig. 7 (IV), the hook member 3 rotates counterclockwise in the figure due to the biasing force from the spring member 6, the tip portion 14 of the hook member 3 descends, and the hook support member 4 rotates clockwise in the figure, and the opening closing member 33 rises. Therefore, according to the sling device 1 of this embodiment, the opening 17 of the hook member 3 automatically opens substantially horizontally immediately after the transported object W is lowered to the floor surface (see Fig. 7 (V)). Thereafter, the hook member 3 of the sling device 1 can be separated and separated from the transported object W by moving the sling device 1 substantially horizontally (in the direction of removing the sling handle Wa of the transported object W from the hook member 3) by the crane operation.

[0027] As described above, according to the sling device 1 of this embodiment, the opening 17 of the hook member 3 is automatically closed when the load of the transported object W acts on the hook member 3 (i.e., the disengagement prevention function is activated), and the opening 17 of the hook member 3 is automatically opened when the load of the transported object W on the hook member 3 is released (i.e., the disengagement prevention function is released). Therefore, manual operations related to disengagement prevention can be omitted, and the work of slinging and removing heavy objects can be safely performed by operating the crane alone.

[0028] Furthermore, according to the lifting device 1 of this embodiment, the connecting member 5 is rotatably connected to the hook support member 4 via the second shaft 37, and has a third shaft 42 at its tip end extending from the second shaft 37 side to be hooked by the hook 9 of the crane, so that the large space around the third shaft 42 can be utilized to attach the lifting device 1 to various cranes.

[0029] Furthermore, according to the suspension device 1 of this embodiment, the mounting portion 6a on the hook support member 4 side and the mounting portion 6b on the hook member 3 side of the spring member 6 are both attached to the mating members, that is, the spring mounting pins 35 and 23, in the internal space between a pair of opposing members, thereby preventing the mounting portions 6a, 6b of the spring member 6 from being exposed to the outside, and thus preventing equipment troubles such as damage or detachment of the spring member 6 due to contact with surrounding parts during transport.

[0030] Fig. 8 is a diagram showing a modified example in which a locking mechanism is further added to the sling device 1 of the present embodiment. In the example of Fig. 8, lever body 52 attached to the hook support member 4 side and stopper member 55 attached to the hook member 3 side constitute the locking mechanism. Lever body 52 has a base end supported so as to be rotatable around shaft 51 attached to main plate 30a of hook support member 4, and an engagement recess 53 capable of engaging with stopper member 55 is formed on the tip end of lever body 52. ​​In addition, a rotation restriction pin 54 is provided between the base end and tip end of lever body 52 to protrude and engage with main plate 30a and temporarily restrict rotation. On the other hand, the stopper member 55 is a cylindrical shaft extending from the bracket 19 of the hook member 3 .

[0031] As shown in Figure 8(A), in the open state where opening 17 of hook member 3 is open, lever body 52 is not engaged with stopper member 55 and is held on the main plate 30a side by rotation restriction pin 54 so as not to rotate. However, as shown in Figure 8(B), in the closed state where opening 17 of hook member 3 is closed, lever body 52 is rotated around axis 51 to engage engagement recess 53 at the tip of lever body 52 with stopper member 55 on the hook member 3 side. Thereafter, the relative rotation between hook support member 4 and hook member 3 is restricted, and the closed state where opening 17 of hook member 3 is closed is maintained.

[0032] 8 configured as above, when the load is light and the weight of the load alone is not enough to keep the opening 17 of the hook member 3 closed, the lock mechanism can be used to ensure the prevention of disengagement. In the example of Fig. 8, the lever body 52 is provided on the hook support member 4 side and the stopper member 55 is provided on the hook member 3 side, but in some cases it is also possible to configure the lever body 52 to be provided on the hook member 3 side and the stopper member 55 to be provided on the hook support member 4 side.

[0033] Although the embodiment of the present invention has been described above in detail, this is merely an example. For example, the sling device of the above embodiment is provided with a connecting member, and the third shaft of the connecting member is hung on the hook of the crane, but it is also possible to eliminate the connecting member and hang the second shaft of the hook support member directly on the hook of the crane. In the above embodiment, the opening direction of the hook member when the load of the transported object is not acting on the hook member is slightly inclined to the upper left direction in the figure as shown in Figure 1, but the opening direction can be changed as appropriate within a range that allows the hanging hand of the transported object to pass through. For example, the present invention can be configured in a form with various modifications within a range that does not deviate from the gist of the present invention. [Explanation of symbols]

[0034] 1 Lifting device 3 Hook member 4 Hook support member 5 Connecting parts 6 Spring members 6a, 6b Mounting part 9 Crane hook (crane side component) 12 Proximal end 14 Tip 17 Aperture 20a,20b plate material 23,35 Spring mounting pin (counterpart) 30a,30b Main plate (plate material) 31 1st axis 33 Opening Closure Member 37 Second axis 42 3rd axis 52 Lever body 55 Stopper member PL plumb line W Transported object

Claims

1. A hook member for lifting the transported object; a hook support member for supporting the hook member, the hook support member having a first shaft for rotatably supporting a base end of the hook member, a second shaft located above the first shaft and serving as a fulcrum when the hook member is suspended by a crane, and an opening closing member located on a rotation trajectory of the hook member for closing an opening of the hook member; a spring member that applies a biasing force to the hook member so as to move a tip end portion of the hook member away from the opening closing member; Equipped with when the hook support member is suspended by a crane and no load of the transported object is acting on the hook member, the first shaft of the hook support member is offset toward an opening of the hook member from a vertical line passing through an axis of the second shaft, and the opening of the hook member is open substantially horizontally, When the load of the transported object acts on the hook member, the opening closing member descends and the tip of the hook member rises to close the opening of the hook member.

2. a lever body having a base end connected to either the hook support member or the hook member; a stopper member attached to the other of the hook support member or the hook member, 2. The hanging device as described in claim 1, further comprising a locking mechanism for engaging a tip of the lever body with the stopper member when the opening of the hook member is closed, thereby restricting relative rotation between the hook support member and the hook member.

3. The lifting device as described in claim 1, further comprising a connecting member that is rotatably connected to the hook support member via the second shaft and has a third shaft at its tip end extending from the second shaft and hooked by a crane side member.

4. 2. The suspension device according to claim 1, wherein the mounting portion of the spring member on the hook support member side and the mounting portion on the hook member side are each attached to a counterpart member in an internal space formed between a pair of opposing plate members.

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