Hook block for construction machinery
The hook block design simplifies assembly by attaching the bracket through multiple holes, eliminating the need to fix the upper and lower ends, thus enhancing assembly efficiency.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- KOBELCO CONSTR MASCH CO LTD
- Filing Date
- 2022-08-23
- Publication Date
- 2026-05-15
AI Technical Summary
The existing hook block designs require fixing the upper and lower ends of the bracket to adjacent side plates, which complicates the assembly process.
A hook block design featuring a bracket with a mounting plate that is fixed to the plate members at both ends, allowing the bracket to be attached by inserting pins through multiple holes, eliminating the need to fix the upper and lower ends to the plate members.
This design improves the ease of assembly by allowing the bracket to be attached without fixing the upper and lower ends, reducing assembly complexity and preventing rotation or movement of the bracket.
Smart Images
Figure 0007859251000001 
Figure 0007859251000002 
Figure 0007859251000003
Abstract
Description
Technical Field
[0001] The present invention relates to a hook block of a working machine provided with a member that collides with a weight of an overwind prevention device.
Background Art
[0002] Patent Document 1 discloses a hook block of a working machine having a bracket disposed between a pair of side plates. A hoisting rope is inserted between a pair of plates of the bracket. An abutting surface that can abut against the weight of the overwind prevention device from below is formed at the middle part of the plate.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In the hook block of Patent Document 1, when attaching the bracket to adjacent side plates (plate members), the upper and lower ends of the plate are fixed to the side plates respectively. However, it is desired to further improve the assemblability.
[0005] An object of the present invention is to provide a hook block of a working machine capable of improving the assemblability when attaching a bracket to adjacent plate members.
Means for Solving the Problems
[0006] The present invention comprises a plurality of plate members arranged in a predetermined direction with their plate surfaces facing each other, one or more sheaves positioned between adjacent plate members, with a sheave pin extending in the predetermined direction as an axis and a hoisting rope wrapped around them, and a bracket positioned between adjacent plate members on the side of the sheave in the radial direction of the sheave, wherein the bracket comprises one or more plates positioned in the predetermined direction not facing the outer circumferential surface of the sheave, a contact surface formed in the middle of the plate that can contact a weight of an overwinding prevention device from below, a mounting plate to which one end of the plate is fixed and which extends in the predetermined direction, with both ends resting on the plate members, and a pin that is inserted in the order of a hole formed in one of the adjacent plate members, a hole formed in the plate, and a hole formed in the other of the adjacent plate members, wherein the hoisting rope is inserted through the space between the plate and the plate members, or the space between adjacent plates. [Effects of the Invention]
[0007] According to the present invention, both ends of the bracket mounting plate are placed on the plate members. The bracket pins are inserted in the following order: a hole formed in one of the adjacent plate members, a hole formed in the plate, and a hole formed in the other of the adjacent plate members. By placing the mounting plate on the plate members and inserting the pins through the multiple holes, the bracket can be attached to adjacent plate members. Therefore, unlike in Patent Document 1, it is not necessary to fix the upper and lower ends of the plate to the plate members. This improves the ease of assembly when attaching the bracket to adjacent plate members. [Brief explanation of the drawing]
[0008] [Figure 1] This is a side view of the crane. [Figure 2A] This is a front view of the hook device. [Figure 2B] This is a view of Figure 2A from direction A. [Figure 3] This is a perspective view of the bracket in the first embodiment. [Figure 4] This is a perspective view of a hook block. [Figure 5] This is a perspective view of the bracket in the second embodiment. [Figure 6A] This is a perspective view of the bracket in the third embodiment. [Figure 6B] This is a view of Figure 6A from direction C. [Figure 7] This is a perspective view of the bracket in the fourth embodiment. [Figure 8] This is a perspective view of a hook block with four sheaves positioned between two plate members. [Figure 9] This is a perspective view of another hook block in which four sheaves are positioned between two plate members. [Figure 10] This is a perspective view of a hook block in which four sheaves are positioned between the two central plate members, and two sheaves are positioned between the two left plate members and two right plate members, respectively. [Figure 11] This is a perspective view of a hook block in which five sheaves are positioned between the two central plate members, and three sheaves are positioned between the two left plate members and three right plate members. [Modes for carrying out the invention]
[0009] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0010] [First Embodiment] (Crane configuration) The hook block of the working machine in the first embodiment of the present invention is provided on a crane which is a working machine. As shown in FIG. 1 which is a side view of the crane 30, the crane 30 has a configuration in which an upper slewing body 32 is mounted on a crawler-type lower traveling body 31 so as to be slewing. Note that the crane 30 may be a mobile crane using moving means other than crawlers (for example, wheels), or may be a stationary crane having no moving means. Further, the working machine is not limited to the crane 30.
[0011] The upper slewing body 32 has a slewing frame 33, a boom 34, a gantry 36, a lower spreader 38, a winch for hook (not shown), a winch for boom hoisting (not shown), and a counterweight 39.
[0012] The slewing frame 33 is attached to the lower traveling body 31 via a slewing bearing (not shown). The boom 34 is connected to the front portion of the slewing frame 33 so as to be capable of hoisting with respect to the slewing frame 33. One end of a boom guy line 49 is connected to the tip of the boom 34.
[0013] A point sheave 41 is provided at the tip of the boom 34. A hook device 43 is suspended from this point sheave 41 via a hoisting rope 42. Note that a jib may be attached to the tip of the boom 34, and the hook device 43 may be suspended from a point sheave 41 provided at the tip of the jib via a hoisting rope 42.
[0014] The gantry 36 is attached to the rear portion of the slewing frame 33. Note that a configuration in which a mast is provided instead of the gantry 36 may be employed. The lower spreader 38 is attached to the upper end of the gantry 36. A boom hoisting rope 51 is hung between the lower spreader 38 and an upper spreader 50 connected to the other end of the boom guy line 49.
[0015] The winch for the hook and the winch for boom hoisting are respectively arranged at the central part of the slewing frame 33. The winch for the hook winds up or pays out the hoisting rope 42 to hoist or lower the hook device 43. The winch for boom hoisting winds up or pays out the boom hoisting rope 51 to raise and lower the boom 34 around the boom foot pin which is its fulcrum.
[0016] The counterweight 39 is mounted on the rear part of the slewing frame 33.
[0017] (Configuration of Hook Block) As shown in FIG. 2A which is a front view of the hook device 43 and FIG. 2B which is a view of FIG. 2A seen from the A direction, the hook device 43 has a hook block 1 and a hook 2. The hook device 43 of the present embodiment is, for example, a 70t hook.
[0018] The hook block 1 has a plurality of plate members 11. As shown in FIG. 2B, in the present embodiment, the number of plate members 11 is 2. The two plate members 11 are arranged side by side in a predetermined direction B such that the plate surfaces face each other. A plurality of spacers 14 are arranged between the two plate members 11. The spacer 14 keeps a predetermined interval between the two plate members 11. The spacer 14 is hollow, and a pin (not shown) is inserted in the order of a hole in one plate member 11, the spacer 14, and a hole in the other plate member 11, so that the two plate members 11 are connected with the spacer 14 sandwiched therebetween. As shown in FIG. 2A, four spacers 14 are arranged side by side along the outer periphery of the lower half of a sheave 12 described later.
[0019] A trunnion pin 15 and a sheave pin 16 are supported between the two plate members 11. The trunnion pin 15 is arranged at the lower end part of the plate member 11 and extends in the predetermined direction B. The sheave pin 16 is arranged at the central part of the plate member 11 and extends in the predetermined direction B. The hook 2 is supported by the trunnion pin 15 so as to be rotatable and swingable.
[0020] Furthermore, the hook block 1 has one or more sheaves 12. In this embodiment, the number of sheaves 12 is three. As shown in Figure 2B, the three sheaves 12 are arranged between adjacent plate members 11, and each has a sheave pin 16 as its axis. A hoisting rope 42 is wrapped around each of the three sheaves 12.
[0021] As shown in Figure 2A, the lower half of the sheave 12 is covered by a sheave guard 17. Four spacers 14 are attached to each of the sheave guards 17.
[0022] Furthermore, the hook block 1 has a bracket 13. The bracket 13 is positioned between adjacent plate members 11, on the side of the sheave 12 in the radial direction.
[0023] (Bracket configuration) As shown in Figure 3, a perspective view of bracket 13, bracket 13 has one or more plates 21, a contact surface 22, a mounting plate 23, a pin 24, and a contact member 25.
[0024] In this embodiment, there are two plates 21. As shown in Figure 2B, each of the two plates 21 is positioned so as not to face the outer surface of the sheave 12 in a predetermined direction B. Specifically, each of the two plates 21 is positioned between adjacent sheaves 12 in a predetermined direction B. As shown in Figure 2A, the plates 21 extend diagonally so as not to interfere with the sheaves 12. As shown in Figure 3, the plates 21 have holes 21a through which the pins 24 pass.
[0025] As shown in Figure 2B, the hoisting rope 42 wrapped around the central sheave 12 passes through the space between adjacent plates 21. The hoisting ropes 42 wrapped around the left and right sheaves 12 pass through the space between the plate 21 and the plate member 11. Therefore, the hoisting ropes 42 are less likely to rub against the bracket 13. As a result, wear on the bracket 13, which is a component that collides with the weight of the overwinding prevention device, can be suppressed. This reduces the frequency of replacement of the bracket 13.
[0026] As shown in Figure 3, the contact surface 22 is formed in the middle part of the plate 21. The contact surface 22 can contact the weight (not shown) of the overwinding prevention device from below.
[0027] The mounting plate 23 extends in a predetermined direction B. In this embodiment, the mounting plate 23 is plate-shaped, but is not limited to this, and may be rod-shaped or the like. One end (upper end) of each of the two plates 21 is fixed (welded) to the mounting plate 23. The mounting plate 23 has an extended portion 23a that extends in a direction perpendicular to the predetermined direction B and parallel to the upper surface of the plate member 11 (see Figure 2B).
[0028] First, the two plates 21 are welded to both ends of the plate-shaped connecting member 26, thereby integrating the two plates 21. Then, the upper ends of each of the two plates 21 are welded from the extended portion 23a to the main body of the mounting plate 23. Note that the plates 21 and the mounting plate 23 may be integrally formed by casting, forging, machining, etc. The mounting plate 23 is placed on the plate member 11 at both ends (see Figure 4). At this time, since the mounting plate 23 is plate-shaped, the mounting plate 23 is in surface contact with the plate member 11.
[0029] In this embodiment, the thickness of plate 21 is the same as the thickness of mounting plate 23, but is not limited to this. The thickness of plate 21 may be made thicker or thinner depending on the distance between the sheaves 12.
[0030] As shown in Figure 3, the pin 24 is inserted in the following order: through a hole 11a formed in one of the adjacent plate members 11 (see Figure 4), through a hole 21a formed in each of the two plates 21, and through a hole 11a formed in the other of the adjacent plate members 11 (see Figure 4). The holes 11a formed in the plate members 11 are for fixing a conventional striker. The striker is a component that can contact the weight of the overwinding prevention device from below, and in this embodiment, the plate 21 corresponds to this.
[0031] As shown in Figure 3, a pair of contact members 25 are provided on the mounting plate 23. The contact members 25 extend from the mounting plate 23 in a direction perpendicular to the predetermined direction B and parallel to the upper surface of the plate member 11 (see Figure 2B). The tip of each contact member 25 is bent toward the sheave 12 side (downward). Each of the pair of contact members 25 contacts the adjacent plate members 11 from the inside of each other. In other words, in the predetermined direction B, the distance from the outer surface of one contact member 25 to the outer surface of the other contact member 25 is equal to or slightly shorter than the distance from the inner surface of one of the two plate members 11 to the inner surface of the other.
[0032] In the above configuration, the bracket 13 is attached to adjacent plate members 11 in the following procedure. As shown in Figure 4, a perspective view of the hook block 1, first, both ends of the mounting plate 23 are placed on the plate members 11. At this time, each of the contact members 25 contacts the adjacent plate members 11 from the inside. Next, the pin 24 is inserted in the following order: through the hole 11a formed in one of the adjacent plate members 11, through the holes 21a formed in each of the two plates 21, and through the hole 11a formed in the other of the adjacent plate members 11. The bracket 13 is attached to adjacent plate members 11 in the above procedure.
[0033] In this way, by placing the mounting plate 23 on the plate member 11 and inserting the pins 24 through multiple holes, the brackets 13 can be attached to adjacent plate members 11. Therefore, unlike in Patent Document 1, it is not necessary to fix the upper and lower ends of the plate to the plate member 11. This improves the ease of assembly when attaching the brackets 13 to adjacent plate members 11.
[0034] Furthermore, since the mounting plate 23 is plate-shaped, it makes surface contact with the plate member 11. This prevents the bracket 13 from rotating around the pin 24.
[0035] Furthermore, by bringing each of the contact members 25 into contact with the adjacent plate members 11 from the inside of each other, it is possible to prevent the bracket 13 from moving in the predetermined direction B.
[0036] (effect) As described above, according to the hook block 1 of this embodiment, both ends of the mounting plate 23 of the bracket 13 are placed on the plate members 11. The pins 24 of the bracket 13 are inserted in the following order: a hole 11a formed in one of the adjacent plate members 11, a hole 21a formed in the plate 21, and a hole 11a formed in the other of the adjacent plate members 11. By placing the mounting plate 23 on the plate members 11 and inserting the pins 24 through the multiple holes, the bracket 13 can be attached to the adjacent plate members 11. Therefore, unlike Patent Document 1, it is not necessary to fix the upper and lower ends of the plate to the plate members. This improves the ease of assembly when attaching the bracket 13 to adjacent plate members 11.
[0037] Furthermore, the mounting plate 23 is plate-shaped. Therefore, the mounting plate 23 makes surface contact with the plate member 11. This prevents the bracket 13 from rotating around the pin 24.
[0038] Furthermore, each of the pair of contact members 25 provided on the mounting plate 23 contacts the adjacent plate members 11 from the inside. This prevents the bracket 13 from moving in the predetermined direction B.
[0039] [Second Embodiment] Next, the hook block of the second embodiment will be described with reference to the drawings. Note that the configuration common to the first embodiment and the effects achieved therein will be omitted from the description, and the differences from the first embodiment will be mainly described. Note that the same reference numerals are used for the same components as in the first embodiment.
[0040] (Bracket configuration) As shown in Figure 5, a perspective view of bracket 113, the bracket 113 of this embodiment has the following configuration in addition to the configuration of the bracket 13 of the first embodiment. That is, the mounting plate 23 of the bracket 113 of this embodiment has an extended portion 23b at each end thereof that extends in a direction perpendicular to a predetermined direction B and parallel to the upper surface of the plate member 11 (see Figure 2B). In this embodiment, the direction in which the extended portion 23b extends is the direction in which the plate 21 extends, but it may extend in the opposite direction.
[0041] In this embodiment, since the mounting plate 23 is plate-shaped, the extended portion 23b is also plate-shaped. Therefore, the extended portion 23b makes surface contact with the plate member 11. This further suppresses the rotation of the bracket 113 around the pin 24.
[0042] The other components are the same as in the first embodiment, so their description will be omitted.
[0043] (effect) As described above, according to the hook block 1 of this embodiment, the mounting plate 23 has an extended portion 23b at each end thereof that extends in a direction perpendicular to the predetermined direction B and parallel to the upper surface of the plate member 11. By bringing the extended portion 23b into contact with the plate member 11, it is possible to suppress the rotation of the bracket 113 around the pin 24.
[0044] [Third Embodiment] Next, the hook block of the third embodiment will be described with reference to the drawings. Note that the configuration common to the first embodiment and the effects achieved therein will be omitted from the description, and the differences from the first embodiment will be mainly described. Note that the same reference numerals are used for the same components as in the first embodiment.
[0045] (Bracket configuration) In the bracket 13 of the first embodiment and the bracket 113 of the second embodiment, the pair of contact members 25 extend from the mounting plate 23 in a direction perpendicular to a predetermined direction B and parallel to the upper surface of the plate member 11, with their tips bent toward the sheave 12 side (downward) (see Figures 3 and 5). In contrast, in the bracket 213 of this embodiment, as shown in Figure 6A, a perspective view of the bracket 213, and Figure 6B, which is Figure 6A viewed from direction C, the pair of contact members 225 have one end (upper end) fixed (welded) to the lower surface of the mounting plate 23 and extend toward the sheave 12 side (downward in the figure). The contact members 225 and the mounting plate 23 may be integrally formed by casting, forging, machining, etc. Alternatively, the contact members 225 may be formed by bending a part of the mounting plate 23.
[0046] Such contact members 225 also come into contact with adjacent plate members 11 from the inside. Here, in order to prevent the contact between the contact member 225 and the plate member 11 from being obstructed, the side of the contact member 225 opposite to the side that comes into contact with the plate member 11 is welded.
[0047] In this embodiment, the thickness of plate 21 is greater than the thickness of mounting plate 23. Therefore, in this embodiment, connecting members 26 (see Figures 3 and 5) that connect the plates 21 together are not used. Also, in this embodiment, the contact surface 22 is raised in a convex or semicircular shape on the upper surface (upper part in the figure) of the plate member 11, but is not limited to this. Also, in this embodiment, the width of the contact surface 22 is the same as the thickness of plate 21, but is not limited to this.
[0048] The other components are the same as in the second embodiment, so their description will be omitted.
[0049] [Fourth Embodiment] Next, the hook block of the fourth embodiment will be described with reference to the drawings. Note that the configuration common to the first embodiment and the effects achieved therein will be omitted from the description, and the differences from the first embodiment will be mainly described. Note that the same reference numerals are used for the same components as in the first embodiment.
[0050] (Bracket configuration) In the bracket 13 of the first embodiment and the bracket 113 of the second embodiment, the pair of contact members 25 extend from the mounting plate 23 in a direction perpendicular to a predetermined direction B and parallel to the upper surface of the plate member 11, with their tips bent toward the sheave 12 side (downward) (see Figures 3 and 5). In contrast, in the bracket 313 of this embodiment, as shown in Figure 7, a perspective view of the bracket 313, extensions 23b are provided at each end of the mounting plate 23, similar to the second and third embodiments. A part of the extension 23b is bent toward the sheave 12 to form a contact member 325. Such a contact member 325 also contacts the plate member 11 from the inside of adjacent plate members 11.
[0051] By forming a contact member 325 in a portion of the extended section 23b, it is not necessary to prepare a separate contact member from the mounting plate 23, thus reducing the number of parts. Furthermore, since there is no need to fix a separate contact member to the mounting plate 23, processing costs can be reduced.
[0052] The other components are the same as in the second embodiment, so their description will be omitted.
[0053] (effect) As described above, in the hook block 1 according to this embodiment, the contact member 325 is formed by bending a part of the mounting plate 23. This eliminates the need to prepare a separate contact member from the mounting plate 23, thus reducing the number of parts. Furthermore, since there is no need to fix a separate contact member to the mounting plate 23, processing costs can be reduced.
[0054] [Fifth Embodiment] Next, the hook block of the fifth embodiment will be described with reference to the drawings. Note that the configuration common to the first embodiment and the effects achieved therein will be omitted from the description, and the differences from the first embodiment will be mainly described. Note that the same reference numerals as in the first embodiment are used for the same components.
[0055] (Hook block configuration) In the first to fourth embodiments, the hook block 1 had a configuration in which three sheaves 12 were arranged between two plate members 11. In contrast, the hook blocks 101, 201, 301, and 401 of this embodiment differ in the number of plate members 11 and the number of sheaves 12, as shown in the perspective views of the hook blocks in Figures 8 to 11.
[0056] In the hook block 101 shown in Figure 8 and the hook block 201 shown in Figure 9, four sheaves 12 are arranged between two plate members 11. The hook device 43 equipped with the hook block 101 shown in Figure 8 is, for example, a 100t hook. The hook device 43 equipped with the hook block 201 shown in Figure 9 is, for example, a 150t hook. In the hook block 201 shown in Figure 9, one sheave 12 is provided on each side in a predetermined direction B above the two plate members 11.
[0057] In the bracket 413 of these hook blocks 101, 201, there are three plates 21. Each of the three plates 21 is positioned in a predetermined direction B such that it does not face the outer surface of the sheave 12. The hoisting ropes 42 (not shown) wrapped around each of the two central sheaves 12 pass through the space between adjacent plates 21. The hoisting ropes 42 (not shown) wrapped around the left and right sheaves 12 pass through the space between the plate 21 and the plate member 11.
[0058] The hook block 301 shown in Figure 10 has four plate members 11. Four sheaves 12 are positioned between the two central plate members 11. Additionally, two sheaves 12 are positioned between the two left-hand plate members 11 and between the two right-hand plate members 11. A hook device 43 equipped with this hook block 301 is, for example, a 200t hook.
[0059] A trunnion pin 15 (see Figure 2A) is supported between the two central plate members 11. In other words, the hook 2 is supported between the two central plate members 11.
[0060] The bracket 513 of this hook block 301 is positioned between the two plate members 11 on the left side of the figure, and between the two plate members 11 on the right side of the figure. The bracket 513 has a plate 21. This plate 21 is positioned between the two sheaves 12 in a predetermined direction B. The hoisting rope 42 (not shown), which is wrapped around each of the two sheaves 12, passes through the space between the plate 21 and the plate members 11.
[0061] The hook block 401 shown in Figure 11 has four plate members 11. Five sheaves 12 are positioned between the two central plate members 11. Additionally, three sheaves 12 are positioned between the two left-hand plate members 11 and between the two right-hand plate members 11. A hook device 43 equipped with this hook block 401 is, for example, a 250t hook.
[0062] A trunnion pin 15 (see Figure 2A) is supported between the two central plate members 11. In other words, the hook 2 is supported between the two central plate members 11.
[0063] The bracket 613 of this hook block 401 is positioned between the two plate members 11 on the left side of the figure, and between the two plate members 11 on the right side of the figure. The bracket 613 has two plates 21. Each of the two plates 21 is positioned so as not to face the outer surface of the sheave 12 in a predetermined direction B. The hoisting rope 42 (not shown) wrapped around the central sheave 12 passes through the space between adjacent plates 21. The hoisting ropes 42 (not shown) wrapped around the left and right sheaves 12 pass through the space between the plate 21 and the plate member 11.
[0064] Note that the specific configuration of brackets 413, 513, and 613 in this embodiment may be any of the brackets 13, 113, 213, and 313 of the first to fourth embodiments, except for the number of plates 21.
[0065] The other configurations are the same as those of the first to fourth embodiments, so their explanation will be omitted.
[0066] Although embodiments of the present invention have been described above, these are merely illustrative examples and do not particularly limit the present invention. Specific configurations and other aspects can be modified as appropriate. Furthermore, the actions and effects described in the embodiments of the invention are merely a list of the most preferred actions and effects resulting from the present invention, and the actions and effects according to the present invention are not limited to those described in the embodiments. [Explanation of Symbols]
[0067] 1,101,201,301,401 Hook Blocks 2 hooks 11 Plate members 12 sieves 13,113,213,313,413,513,613 bracket 14 Spacers 15 Trunnion pins 16 Sheave pins 17 Sea Guard 21 plates 22 Contact surface 23 Mounting plate 23a Extension part 23b Extension part 24 pins 25,225,325 Contact members 26 Connecting Member 30 Cranes 31 Lower running body 32 Upper rotating body 33. Swivel Frame 34 Boom 36 Gantry 38 Lower spreader 39 Counterweight 41 point receive 42 Hoisting rope 43 Hook device 49 Boom Guyline 50 Top spreader 51 Boom luffing rope
Claims
1. Multiple plate members arranged in a predetermined direction so that their surface surfaces face each other, One or more sheaves are arranged between adjacent plate members, with a sheave pin extending in the predetermined direction as the axis, and a hoisting rope is wrapped around them. Between adjacent plate members, a bracket is positioned on the side of the sheave in the radial direction of the sheave, It has, The aforementioned bracket is One or more plates are positioned in the predetermined direction that do not face the outer circumferential surface of the sheave, A contact surface formed in the middle of the plate, which can contact the weight of the overwinding prevention device from below, A mounting plate having one end fixed to it, extending in the predetermined direction, with both ends resting on the plate member, A pin is inserted in the following order: through a hole formed in one of the adjacent plate members, through a hole formed in the plate, and through a hole formed in the other of the adjacent plate members. It has, The hook block of a work machine is characterized in that the hoisting rope passes through the space between the plate and the plate member, or the space between adjacent plates.
2. The hook block for the work machine according to claim 1, characterized in that the mounting plate is plate-shaped.
3. The hook block for the work machine according to claim 1 or 2, characterized in that the mounting plate has an extended portion at each end thereof that extends in a direction perpendicular to the predetermined direction and parallel to the upper surface of the plate member.
4. The aforementioned bracket is The hook block for the work machine according to claim 1 or 2, characterized in that a pair of contact members are provided on the mounting plate, and each has a contact member that contacts the adjacent plate members from the inside of the plate members.
5. The hook block of the work machine according to claim 4, characterized in that the contact member is formed by bending a part of the mounting plate described above.