JP2011236027A - Hook holder and hook device of wheel crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook holder for wheel cranes, which supports a hook portion so as to secure excellent visibility and enough ground clearance while the wheel crane is running with simple operation.SOLUTION: The hook holder 1 for wheel cranes has an attachment part 22 which is attached to a hook block 4 so as to be removal and enclose it, and a hook support portion 24 which supports the hook portion 6. The attachment part 22 and the hook support portion 24 are formed so that the hook support portion 24 supports the hook portion 6 from the bottom so that the hook portion 6 may be in a posture rotated from the vertical direction to the direction along to a boom by a specified angle when the hook block 4 is held in a posture along to the boom in a falling-down state by attaching the attachment part 22 to the hook block 4.

Description

  The present invention relates to a hook holding tool and a hook device of a wheel crane.

  The wheel crane includes a lower traveling body that travels by rotation of a wheel and an upper swing body mounted on the lower traveling body, and a rope is attached to the upper swing body from a tip of a boom that can be raised and lowered. A suspended load is suspended by a hook device that can be lifted and lowered via the door. When such a wheel crane travels, the boom is in a state of being laid down to the maximum so as to be lowered forward. At this time, if the hook device hangs down from the tip of the boom, there is a possibility that the traveling of the crane may be hindered. Therefore, in the following Patent Document 1 and the following Patent Document 2, techniques for preventing the hook device from drooping are proposed.

  In Patent Document 1, a hook storage that is attached to the lower surface of the tip portion of the boom in a fallen state and stores the hook device in a posture along the boom in a state where the boom has fallen to the maximum to suppress drooping of the hook device. The device is shown. In this hook storage device, when the hook device is wound up, the hook block of the hook device is engaged in the hook storage device, so that the hook block takes a posture along the lying boom. .

  Further, in Cited Document 2, the main winding hook is fixed on the lower traveling body so that the main winding hook does not hang down from the tip of the boom when the boom is laid down to the maximum for traveling of the wheel crane. It has been shown.

JP-A-4-34196 JP-A-9-208188

  However, in the technique of Patent Document 1, the hook block of the hook device is prevented from hanging by holding the hook block, but the hook portion for hanging the suspended load cannot be prevented from hanging.

  Specifically, in the crane hook device disclosed in Patent Document 1, a hook portion for hanging a suspended load is attached to the hook block so as to be rotatable about a horizontal axis. For this reason, even if the hook block is stored in a posture that follows the boom in a lying state by the hook storage device, only the hook portion hangs vertically downward from the hook block.

  In addition, the technique disclosed in Patent Document 2 has problems in that the work required for preventing the main hook from hanging down is complicated and the visibility from the cab during traveling of the crane is deteriorated.

  Specifically, in the technique of Patent Document 2 described above, when the main winding hook is fixed on the lower traveling body, the main winding hook suspended from the tip of the boom is disposed at the fixing portion of the hook on the lower traveling body. After adjusting the boom raising / lowering angle as described above, it is necessary to fix the main winding hook, and then to lower the boom to the maximum lying posture, which is the posture during traveling. For this reason, the work required to prevent the main winding hook from hanging down becomes complicated. In addition, when the main winding hook is fixed on the lower traveling body, the boom cannot be largely laid down in order to avoid interference between the main winding hook fixed on the lower traveling body and the boom. . As a result, when the crane is traveling, the field of view from the cab is blocked by the boom and a good field of view cannot be obtained.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a hook portion so as to ensure a good field of view and a sufficient ground clearance during traveling of the wheel crane by a simple operation. It is providing the hook part holding tool and hook apparatus of a wheel crane which can hold | maintain.

  In order to achieve the above object, the invention described in claim 1 is a boom that can be raised and lowered, a hook block that is suspended from a tip of the boom via a rope, and the hook block. And a hook portion for hanging a suspended load, and attached to a tip portion of the boom. The hook block is moved along the boom as the hook block is rolled up. A hook part holding tool for a wheel crane for holding the hook part, which is attached to a wheel crane having a hook block holding member that is displaced in the direction and holds the hook block so as to surround the hook block A mounting portion that is detachably attached to the hook portion, and a hook support portion that supports the hook portion. The mounting portion is attached to the hook block, so that the hook portion rotates by a predetermined angle from the vertical direction to the direction along the boom when the hook block is held in a posture along the boom in the lying state. The hook support portion is formed in a shape that supports the hook portion from below so that the posture is moved.

  In the first aspect of the invention, by attaching the hook portion holder to the hook block, it is possible to prevent the hook portion from sagging and to ensure a good field of view and a sufficient ground clearance when the wheel crane is traveling. .

  Specifically, if the hook holder is attached to the hook block according to the present invention, when the hook block is held by the hook block holding member in a posture along the boom in a lying state, the hook part is bent from the vertical direction. The hook support part of the hook part holder supports the hook part from below so that it is in a posture rotated by a predetermined angle in a direction along the hook, so that the hook block is held when it is held along the boom in a lying state It is possible to prevent the part from hanging down. Thus, by preventing the hook portion from drooping, a sufficient ground clearance can be ensured even if the boom is laid down to the front when the wheel crane is traveling. In addition, since the hook part does not hang down, it is possible to lay the boom so that it tilts greatly forward and to prevent the view from the cab from being blocked by the boom when the wheel crane is running. Can be secured.

  In the first aspect of the present invention, the hook portion can be prevented from drooping only by attaching the hook portion holder to the hook block, so that the hook portion can be prevented from drooping with a simple operation.

  Specifically, in the above-described conventional technology, it is necessary to perform a complicated boom hoisting operation to adjust the hoisting angle of the boom so that the hook is positioned at a fixed portion on the lower traveling body of the crane. After fixing to the fixing part, the boom needs to be raised and lowered twice to the maximum falling posture which is the posture at the time of traveling, whereas according to the present invention, the mounting portion of the hook holder is attached. By simply attaching to the hook block, it is possible to prevent the hook portion from hanging down without performing the complicated boom raising / lowering angle adjustment described above and the boom raising / lowering operation which is troublesome twice. Therefore, in the present invention, it is possible to prevent the hook portion from hanging down with a simpler operation than in the prior art.

  Further, in the present invention, since the hook portion does not interfere with the fall of the boom as in the conventional technique of fixing the hook on the lower traveling body, the boom can be greatly lowered forward and lowered. It is possible to ensure a good field of view when traveling.

  Therefore, according to the hook portion holder of the present invention, the hook portion can be held by a simple operation so that a good field of view and a sufficient ground height during traveling of the wheel crane can be ensured.

  According to a second aspect of the present invention, in the hook portion holder of the wheel crane according to the first aspect, the attachment portion is configured so that the hook block is suspended from the tip of the boom. It has an opening part which can be penetrated in the direction orthogonal to the direction where the rotation axis of a hook part is extended, and a horizontal direction, and the above-mentioned hook support part is a pair of end parts by the side of the above-mentioned hook block among said attachment parts And detachably coupled to each other to connect the end portions thereof.

  According to the second aspect of the present invention, in a state where the hook block is suspended from the tip end portion of the boom, the operator makes the attachment portion orthogonal to the direction in which the rotation shaft of the hook portion extends with respect to the hook block. The hook portion by connecting the pair of end portions to each other, and then connecting the hook support portions to the pair of end portions on the side where the hook block enters among the mounting portions. A holder can be attached to the hook block. That is, according to the present invention, the operator can attach the attachment portion of the hook holder from the side to the hook block suspended from the tip of the boom, and can perform the attachment operation in an easy working posture. It can be carried out. For this reason, the work burden concerning the attachment work of the attachment part with respect to a hook block can be reduced.

  According to a third aspect of the present invention, in the hook portion holder of the wheel crane according to the second aspect, the hook portion holder is separated from each other in the extending direction of the rotation shaft of the hook portion as the hook block. And a pair of side plates constituting both outer side surfaces of the hook block, a hook support shaft provided so as to penetrate the pair of side plates, and supporting the hook portion between the pair of side plates, Each of which is attached to a hook block that protrudes from the outer surface of the side plate and has a support shaft holding portion that rotatably supports a corresponding end portion of the hook support shaft. Placed on the corresponding support shaft holding part in a state where the side plate is sandwiched from both outer sides and the hook block is suspended from the tip of the boom. A pair of mounting portions, and a connecting portion that contacts the upper surface of the hook block held in a posture along the boom in a lying state and connects the pair of mounting portions to each other, The hook support portion is detachably coupled to the pair of placement portions at a position opposite to the connection portion with respect to the hook block, and connects the pair of placement portions to each other. is there.

  In this invention of Claim 3, in the state which the hook block was suspended from the front-end | tip part of a boom, the attachment part of a hook part holder is the surface which becomes the both outer sides and a said upper surface of a pair of side plate from the side of a hook block. The hook block is suspended by connecting the hook support portions to the pair of placement portions of the attachment portion and connecting the pair of placement portions by the hook support portions. Then, when the mounting portion is supported from below by the support shaft holding portion of the hook block, the hook portion holding tool is fixed to the hook block, and when the hook block is held in a posture along the boom in a lying state The hook portion holder is fixed to the hook block by the connecting portion being supported by the upper surface of the hook block. That is, in the invention according to the third aspect, the hook portion holder can be fixed to the hook block without using attachment means such as attachment screws. For this reason, in the invention according to the third aspect, the hook unit holder can be easily attached to the hook block without forming a screw hole or the like for fixing the hook unit holder in the hook block. A hook holder can be easily retrofitted to a hook block of an existing wheel crane.

  The invention according to claim 4 is the hook part holder of the wheel crane according to claim 3, wherein the hook support part has a pair of connection parts detachably coupled to the pair of placement parts, The placement part and the connection part are respectively provided with pin holes, and the placement part and the connection are connected by inserting a pin into the pin hole of the placement part and the pin hole of the connection part. The parts are connected to each other.

  According to the fourth aspect of the present invention, since the mounting portion of the mounting portion and the connecting portion of the hook support portion can be pin-coupled, the mounting portion is connected to the mounting portion as compared with, for example, the case of fastening with bolts. The joining operation of the parts can be easily performed.

  According to a fifth aspect of the present invention, in the hook portion holder of the wheel crane according to the fourth aspect, the hook support portion connects the pair of connection portions to each other, and the hook block is attached to the lying boom. The mounting portion has a support portion that supports the hook portion from below so that the hook portion is rotated by a predetermined angle from a vertical direction to a direction along the boom when held in a posture along the boom. One of the connection portions is provided with a plurality of pin holes, and the plurality of pin holes are coupled by the pin holes provided on the other of the placement portion and the connection portions by the pins. The support portions are arranged so as to be arranged at different positions when they are moved.

  In the fifth aspect of the present invention, if the pin hole used for the pin connection is changed, for example, even when the size of the hook portion is different, the hook portion is appropriately positioned at the position corresponding to the size of the hook portion. Can be supported so as not to hang down.

  The invention according to claim 6 is a hook device for a wheel crane that can be hung from a tip end portion of a boom that is provided on a wheel crane so as to be able to move up and down, and is hung from a tip end portion of the boom via a rope. A hook block that is attached to the hook block so as to be rotatable about a horizontal axis, and for hanging a suspended load, and the hook unit holder according to any one of claims 3 to 5. The hook block is disposed apart from each other in the direction in which the rotation axis of the hook portion extends, and a pair of side plates constituting both outer side surfaces of the hook block, and the pair of side plates are penetrated. A hook support shaft provided to support the hook portion between the pair of side plates, and projectingly provided on the outer surface of each side plate, and rotating a corresponding end portion of the hook support shaft. And the pair of mounting portions of the mounting portion are disposed so as to sandwich the pair of side plates from both outer sides, and the hook block is a tip portion of the boom. In the state of being suspended from each other, it is respectively placed on the corresponding support shaft holding part, and the connecting part comes into contact with the upper surface of the hook block held in a posture along the boom in a lying state. The pair of placement portions are coupled to each other, and the hook support portion is detachably coupled to the pair of placement portions at a position opposite to the connection portion with respect to the hook block. The mounting portions are connected to each other.

  According to the sixth aspect of the present invention, as in the case of the third aspect of the present invention, the hook block holder is not formed in the hook block without forming a screw hole or the like for fixing the hook block holder in the hook block. Can be easily attached, so that the hook holder can be easily retrofitted to the hook block of an existing wheel crane. Further, in the invention according to claim 6, when the hook block is suspended from the tip of the boom, the hook block support shaft is engaged when the hook portion holding portion is engaged with the hook block. Since the mounting portion can be fixed with respect to the hook block by using the holding portion, it is not necessary to separately provide a portion for fixing the position of the mounting portion on the outer surface of the side plate of the hook block. Therefore, according to the present invention, it is possible to facilitate the retrofitting of the hook portion holder to the hook block while preventing an increase in the number of members constituting the hook block.

  As described above, according to the present invention, the hook portion can be held by a simple operation so that a good field of view and a sufficient ground height can be secured when the wheel crane is traveling.

It is a side view which shows the state before winding up the hook apparatus of the wheel crane which attached the hook part holder by one Embodiment of this invention. It is a side view which shows the state which wound up the hook apparatus of the wheel crane shown in FIG. 1, and fell the boom to the driving | running | working attitude | position. It is a figure which expands and shows the hook apparatus in FIG. 1 partially. It is a figure which expands and shows the hook apparatus in FIG. 2 partially. It is sectional drawing along the VV line of the hook apparatus shown in FIG. It is sectional drawing along the VI-VI line of the hook apparatus in FIG. It is a side view of the attaching part of the hook part holder by one Embodiment of this invention. It is a front view of the attaching part of the hook part holder by one Embodiment of this invention. It is a side view of the hook support part of the hook part holder by one Embodiment of this invention. It is a front view of the hook support part of the hook part holder by one Embodiment of this invention. It is a side view of the hook support part of the hook part holder by the 1st modification of one embodiment of the present invention. It is a figure corresponding to FIG. 4 which shows the state which attached the hook part holder by the 1st modification of one Embodiment of this invention to the hook block. It is a figure corresponding to FIG. 4 which shows the state which attached the hook part holder by the 1st modification of one Embodiment of this invention to the hook block. It is a side view of the attaching part of the hook part holder by the 2nd modification of one embodiment of the present invention. It is a figure corresponding to FIG. 4 which shows the state which attached the hook part holder by the 2nd modification of one Embodiment of this invention to the hook block. It is a figure corresponding to FIG. 4 which shows the state which attached the hook part holder by the 2nd modification of one Embodiment of this invention to the hook block.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, with reference to FIGS. 1-10, the structure of the hook part holder 1 and the hook apparatus 2 of the wheel crane 100 by one Embodiment of this invention is demonstrated.

  The hook part holder 1 of this embodiment is attached to a wheel crane 100 as shown in FIG. 1, and holds the hook part 6 so that the hook part 6 of the wheel crane 100 does not hang down from the hook block 4. belongs to.

  The wheel crane 100 includes a lower traveling body 102 that travels by rotation of a wheel 102a, an upper revolving body 104 that is mounted on the lower traveling body 102 so as to be able to swivel around a vertical axis, and in which an operator cab 104a is provided, A boom 106 that can be raised and lowered on the upper swing body 104, a hook block holding member 107 that holds a hook block 4 of the hook device 2 to be described later in a posture along the boom 106, and a rope 108 from the tip of the boom 106 via a rope 108. And a hook device 2 hung up and down freely.

  The boom 106 can be extended and contracted, and when the wheel crane 100 is traveling, the boom 106 is in a contracted state and is in a maximum downward posture (traveling posture) as shown in FIG.

  The hook block holding member 107 displaces and holds the hook block 4 in a direction along the boom 106 in accordance with the later-described hook block 4 being wound up. The hook block holding member 107 is attached to a lower end portion of the tip end portion of the boom 106 in the boom 106 in a lying state. The hook block holding member 107 is rotatably attached to an unillustrated shaft portion whose upper end extends in the width direction (horizontal direction) of the boom 106. As a result, the hook block holding member 107 can be rotated in a direction in which the hook block holding member 107 is in a posture along the boom 106 from the posture in which the hook block holding member 107 is hung in the vertical direction as shown in FIG. ing. In the state shown in FIG. 1, when the hook block 4 is rolled up, the hook block 4 comes into contact with the lower end portion of the hook block holding member 107, and when the hook block 4 is further rolled up, the hook block holding member is caused by the winding force. 107 rotates backward in the direction along the boom 106, and the hook block 4 is also displaced in the same direction and held in a posture along the boom 106.

  The hook device 2 includes a hook block 4 that can be lifted and lowered from a tip end portion of a boom 106 via a rope 108, and a hook that is provided on the hook block 4 so as to be rotatable about a horizontal axis and is used to suspend a suspended load. It has the part 6 and the hook part holder 1 of this embodiment.

  As shown in FIGS. 3 to 5, the hook block 4 includes a pair of side plates 8, a sheave support shaft 10, a plurality of sheaves 12 (see FIG. 5), a hook support shaft 14, and a hook keeper plate 16. Have

  The pair of side plates 8 are spaced apart from each other in a direction in which a later-described rotation axis (horizontal axis) of the hook portion 6 extends. The outer side surfaces of the both side plates 8 constitute both outer side surfaces of the hook block 4. Each side plate 8 is provided with a sheave through hole 8a (see FIG. 5) and a hook through hole 8b. The sheave through-holes 8a of the side plates 8 are arranged at positions corresponding to each other, and the hook through-holes 8b of the side plates 8 are arranged at positions corresponding to each other. The sheave through-hole 8 a is provided at a portion that is an upper portion of the side plate 8 in a state where the hook block 4 is suspended from the tip end portion of the boom 106, and is disposed at a center position in the width direction of the side plate 8. The hook through-hole 8b is provided at a lower portion of the side plate 8 in a state where the hook block 4 is suspended from the distal end portion of the boom 106, and is disposed at the center of the side plate 8 in the width direction. Further, both end edges in the width direction of each side plate 8 gradually approach each other from a position in the vicinity of the sheave through hole 8a to one end portion in the longitudinal direction of the side plate 8 located on the hook through hole 8b side. It is inclined linearly.

  The sheave support shaft 10 supports the sheave 12 in a rotatable manner, and is fitted into the through-holes 8 a for sheaves of the pair of side plates 8.

  The plurality of sheaves 12 are on which the rope 108 is hung, and are supported by the sheave support shaft 10. The plurality of sheaves 12 are arranged separately between the pair of side plates 8 and outside the side plates 8.

  The hook support shaft 14 supports the hook portion 6 between the pair of side plates 8, and is provided so as to pass through both the side plates 8 by being fitted into the hook through holes 8 b of the pair of side plates 8. It has been. An insertion hole 14a (see FIG. 5) penetrating in a direction orthogonal to the axial direction is provided in the central portion of the hook support shaft 14 in the axial direction.

  The hook keeper plate 16 supports the hook support shaft 14 so as to be rotatable about the axis thereof, and is protruded from the outer surface of each side plate 8. The hook keeper plate 16 is included in the concept of the support shaft holding portion of the present invention. The hook keeper plate 16 is provided on both sides of the hook through hole 8b on the outer surface of each side plate 8, and the end of the hook support shaft 14 protruding outside the side plate 8 through the hook through hole 8b. Is rotatably supported. The upper surface of the hook keeper plate 16 is formed in a planar shape that becomes a horizontal plane in a state where the hook block 4 is suspended in the vertical direction.

  As shown in FIG. 5, the hook portion 6 extends linearly and is provided continuously to the shaft portion 6 a inserted through the insertion hole 14 a of the hook support shaft 14 and the lower end of the shaft portion 6 a. And a hanging portion 6b to be hung. The base end portion (upper end portion in the state of FIG. 5) of the shaft portion 6a protrudes from the hook support shaft 14 through the insertion hole 14a. A base end portion of the shaft portion 6a is attached to the hook support shaft 14 via a thrust bearing 6c, and is fixed to the thrust bearing 6c by a nut 6d. Thereby, the hook part 6 can be rotated with respect to the hook support shaft 14 around the axis of the shaft part 6a. And since the hook support shaft 14 can be rotated around its axial center extending in the horizontal direction, the hook portion 6 has a horizontal shaft (hook support shaft 14) together with the thrust bearing 6 c, the nut 6 d and the hook support shaft 14. It can be rotated around the axis).

  And the hook part holder 1 by this embodiment is attached to the wheel crane 100 of a structure as demonstrated above, and hold | maintains the said hook part 6 so that it may not hang down.

  Specifically, the hook part holder 1 is attached to the hook block 4. The hook part holder 1 includes an attachment part 22, a hook support part 24, a pin 26, and a retaining member 28.

  The attachment portion 22 and the hook support portion 24 are configured such that when the attachment portion 22 is attached to the hook block 4, the hook portion 6 can be seen from the vertical direction when the hook block 4 is held in a posture along the boom 106 in a lying state. The hook support portion 24 is formed in such a shape as to support the hook portion 6 from below so as to have a posture rotated by a predetermined angle in a direction along the direction. Thus, the hook part holder 1 supports the hook part 6 from below, so that a sufficient ground level capable of safe traveling is secured as the ground level H (see FIG. 2) of the front part of the wheel crane 100. At the same time, a sufficient approach angle is ensured as an approach angle α (see FIG. 2) corresponding to the angle of the slope on which the wheel crane 100 can enter. In other words, the hook portion 6 hangs down to a position where the shapes of the mounting portion 22 and the hook support portion 24 of the book portion holder 1 are below the prescribed sufficient ground height H and below the prescribed sufficient approach angle α. The hook portion 6 can be supported so that the hook portion 6 does not exist.

  The attachment portion 22 is formed in a shape opened in one direction (see FIG. 8), and is detachably attached to the hook block 4 so as to surround the hook block 4. The mounting portion 22 is perpendicular to the direction in which the hook support shaft 14, which is the rotation shaft of the hook portion 6, extends in a state where the hook block 4 is suspended in the vertical direction from the tip of the boom 106. And an opening 22a that can enter in the horizontal direction.

  Specifically, the attachment portion 22 includes a pair of placement portions 30, a connection portion 32, and a handle portion 34.

  The pair of mounting portions 30 are arranged so as to sandwich the pair of side plates 8 of the hook block 4 from both outside in the extending direction of the hook support shaft 14, and the hook block 4 is suspended from the tip of the boom 106. And the corresponding hook keeper plate 16 (see FIGS. 3 and 5). Each mounting portion 30 is composed of a long and narrow plate material having the same shape, and is provided continuously on a first portion 30a extending linearly in a specific direction and on the distal end side of the first portion 30a, with respect to the first portion 30a. And a second portion 30b extending obliquely.

  The first portion 30a has a length substantially equal to the width of the portion of the side plate 8 to which the attachment portion 22 is attached. The first portion 30a of the placement portion 30 is placed on the upper surface of the hook keeper plate 16, and the first portion 30a is in a state where the hook block 4 is suspended in the vertical direction. Are arranged to extend in the horizontal direction.

  The second portion 30 b protrudes from one edge in the width direction of the side plate 8 and extends toward the hook portion 6 b of the hook portion 6 in a state where the attachment portion 22 is attached to the hook block 4. The second portion 30b is provided with two pin holes 30c (see FIG. 7) penetrating in the plate thickness direction. The two pin holes 30c are arranged apart from each other along the extending direction of the second portion 30b.

  The connecting portion 32 connects the pair of placement portions 30 to each other, and abuts on the upper surface of the hook block 4 held in a posture along the lying boom 106. Specifically, the connecting portion 32 has a substantially L-shaped cross section. A contact portion 32a that is a portion that forms one side of the L-shaped cross section of the connecting portion 32 and that is in contact with the surface that becomes the upper surface of the hook block 4 is a base end portion (a pair of mounting portions 30). Of the first portion 30a of the mounting portion 30 is welded to the end portion opposite to the second portion 30b), and these base end portions are connected to each other. The angle formed between the contact portion 32a and the edge of the first portion 30a of the mounting portion 30 that contacts the upper surface of the hook keeper plate 16 is determined by the upper surface of the hook block 4 that the contact portion 32a contacts. And the angle formed by the upper surface of the hook keeper plate 16 and the upper surface of the hook keeper plate 16 (the inclined end edge serving as the rear end edge of the side plate 8 when the hook block 4 is suspended). Thus, when the mounting portion 22 is engaged with the hook block 4, the first portion 30 a of the mounting portion 30 contacts the upper surface of the hook keeper plate 16 and the connecting portion is connected to the inclined edge of the side plate 8. The attachment portion 22 is fixed in position with respect to the hook block 4 by the contact of the 32 contact portions 32a.

  The handle portion 34 is provided on the outer surface of the central portion in the longitudinal direction of the first portion 30 a of each placement portion 30. The handle portion 34 is a portion that is held by the operator to hold the attachment portion 22 when the hook portion holder 1 is attached to or detached from the hook block 4.

  The hook support portion 24 is a member for supporting the hook portion 6. The hook support portion 24 is a separate member from the attachment portion 22 and is detachably coupled to the attachment portion 22. As shown in FIG. 10, the hook support portion 24 is formed in a shape opened in one direction. The hook support portion 24 is detachably coupled to the pair of end portions of the attachment portion 22 on the side where the hook block 4 enters, that is, the second portions 30b of the pair of placement portions 30 and the second portions thereof. The portions 30b are connected to each other.

  Specifically, the hook support portion 24 includes a pair of connection portions 36, a support portion 38, and a pair of handle portions 40.

  The pair of connection portions 36 are detachably coupled to the second portions 30 b of the pair of placement portions 30 at positions opposite to the coupling portion 32 with respect to the hook block 4. Specifically, the connecting portion 36 is made of an elongated plate material extending linearly, and two pin holes 36a (see FIG. 9) penetrating in the plate thickness direction are provided at one end portion thereof. The two pin holes 36a are arranged apart from each other in the extending direction of the connecting portion 36, and are provided at positions corresponding to the two pin holes 30c provided in the second portion 30b. The pair of connection portions 36 are arranged separately on both outer sides of the pair of placement portions 30 and overlap with the second portion 30b of the corresponding placement portion 30 so as to extend in the same direction as the second portion 30b. Then, the two pin holes 36a provided in each connection portion 36 and the two pin holes 30c provided in the second portion 30b are aligned. Then, the pin 26 is inserted into the aligned pin holes 36a and 30c as described later, so that the second portion 30b of the mounting portion 30 and the connecting portion 36 are coupled to each other. Yes.

  In addition, the angle formed between the pair of connection portions 36 and the first portion 30 a of the placement portion 30 in a state where the connection portion 36 is coupled to the second portion 30 b of the placement portion 30 is related to the hook block 4. In the state where the contact portion 32 a of the connecting portion 32 is in contact with the end edge of the hook block 4 and the first portion 30 a of the mounting portion 30 is in contact with the upper surface of the hook keeper plate 16, Is held in a posture along the boom 106 in a lying state, the height position of the lower end of the hook portion 6 is equal to or higher than the predetermined ground height H, and the lower end of the hook portion 6 enters the range of the predetermined approach angle α. In order to prevent the hook portion 6 from being supported, the support portion 38 (described later) is set at an angle.

  The support portion 38 is configured such that when the hook block 4 is held in a posture along the lying boom 106, the hook portion 6 is in a posture rotated by a predetermined angle from the vertical direction to the direction along the boom 106. This is the part that supports from below. The support portion 38 is formed in an elongated flat plate shape extending in parallel with the hook support shaft 14, and is connected to the side of the pair of connection portions 36 where the pin hole 36 a is provided (coupled to the second portion 30 b of the attachment portion 22). The ends on the opposite side are connected to each other. The support portions 38 are welded to the edges of the pair of connection portions 36 in a state where the support portions 38 are stretched over both edges located on the hook portion 6 side opposite to the side where the pin hole 36a is provided. Has been.

  The handle portion 40 is provided at a corresponding position on the outer side surface of each connection portion 36. The handle portion 40 is a portion that is held by the operator to hold the hook support portion 24 when the hook portion holder 1 is attached to or detached from the hook block 4. The handle portion 40 is provided at a portion of each connecting portion 36 that is located between a location where the pin hole 36 a is provided and a location where the connecting portion 32 is coupled.

  As shown in FIG. 6, two pins 26 are provided, and each pin 26 is provided in a corresponding pin hole 30c provided in the second portion 30b of one mounting portion 30 and the second portion 30b. The other pin portion 30b is inserted into the corresponding pin hole 36a of the one connection portion 36 to be overlapped and the other pin portion 30b provided in the second portion 30b of the other mounting portion 30 is overlapped with the second portion 30b. Is inserted into the corresponding pin hole 36a of the connecting portion 36. And the pin 26 is arrange | positioned so that it may extend in parallel with the hook support shaft 14 in the state inserted by pin hole 36a, 30c in this way. When the hook block 4 is arranged so that the pin 26 inserted into the pin hole 30c located closer to the first part 30a of the two pin holes 30c of the second part 30b is along the boom 106 in the lying state. The peripheral surface comes into contact with the surface that is the lower surface of the hook block 4. As a result, when the attachment portion 22 is engaged with the hook block 4 and the second portion 30b of the mounting portion 30 of the attachment portion 22 and the connection portion 36 of the hook support portion 24 are pin-coupled with this pin 26, the attachment portion The hook block 4 is sandwiched between the abutting portion 32 a of the connecting portion 32 of 22 and the pin 26.

  An unillustrated through hole penetrating in the radial direction is provided at an end portion of each pin 26 that protrudes to the outside of the connecting portion 36 through the pin hole 36a. In a state where each pin 26 is inserted into the pin holes 36 a and 30 c, the pin portion 28 of the retaining member 28 is inserted into the through hole of each pin 26. The retaining member 28 is provided with a retaining ring 28b at one end of the pin portion 28. After the pin portion 28 is inserted into the through hole of the pin 26, the retaining ring 28b is attached to the pin portion 28 as shown in FIG. The pin portion 28 is prevented from coming out of the through hole of the pin 26 by being hooked on the other end. Then, by inserting the pin portion 28 of the retaining member 28 into the through hole at the end portion of each pin 26, the pin 26 is prevented from coming out of the pin holes 36a and 30c.

  Next, the attachment method with respect to the hook block 4 of the hook part holder 1 by this embodiment is demonstrated.

  First, when attaching the hook unit holder 1 to the hook block 4, as shown in FIG. 1, the hook device 2 is suspended from the tip of the boom 106 in a substantially horizontal posture through the rope 108. A person lifts the attachment portion 22 of the hook holder 1 and engages the attachment portion 22 with the hook block 4 from the rear side. At this time, the contact portion 32 a of the connecting portion 32 of the attachment portion 22 contacts the rear end edges of the pair of side plates 8 of the hook block 4, and the pair of mounting portions 30 of the attachment portion 22 are connected to both the pair of side plates 8. The mounting portion 22 is engaged with the hook block 4 so as to be separated from the outside and overlap the outer surface of the side plate 8. At this time, the first portion 30 a of each placement portion 30 of the attachment portion 22 is placed on the corresponding hook keeper plate 16. Thereby, even if an operator does not hold the attachment part 22 by hand, the position of the attachment part 22 is fixed while being engaged with the hook block 4.

  Next, the operator lifts the hook support portion 24 of the hook portion holder 1, and the pair of connection portions 36 of the hook support portion 24 are located outside the second portions 30 b of the pair of placement portions 30 of the attachment portion 22. The hook support portion 24 is arranged so as to overlap. Then, the two pin holes 36a provided in the connection portion 36 are aligned with the two pin holes 30c provided in the second portion 30b on which the connection portion 36 is overlapped, and the pin 26 is connected to each pin hole. It is inserted into 36a, 30c. Thereby, a pair of mounting part 30 of the attaching part 22 and a pair of connection part 36 of the hook support part 24 are pin-coupled. Then, the pin portion 28a of the retaining member 28 is inserted into the through hole provided at the end portion of each pin 26, and the pin portion 28a is retained by the retaining ring 28b. The pin 26 is prevented from falling off. As described above, the hook holder 1 is attached to the hook block 4.

  Next, a process in which the hook portion 6 is held by the hook portion holder 1 of the present embodiment will be described.

  As shown in FIG. 1, after attaching the hook holder 1 to the hook block 4, the operator of the crane 100 operates the hook winch (not shown) to wind up the hook block 4. At this time, when the hook block 4 comes into contact with the hook block holding member 107 and the hook block 4 is further wound up, the hook block holding member 107 is rotated backward along the boom 106 by the hoisting force. The hook block 4 is also displaced in the same direction. At this time, the hook portion 6 rotates together with the hook support shaft 14 in the direction of hanging from the hook block 4, but at the position where the hook portion 6 b of the hook portion 6 contacts the support portion 38 of the hook portion holder 1. The movement is stopped and no further rotation.

  Thereafter, the operator performs an operation of overturning the boom 106 to bring the boom 106 into a traveling posture in which the boom 106 is inclined downward. In this traveling posture, as shown in FIG. 2, the hook portion holder 1 prevents the hook portion 6 from hanging down, so that a sufficient ground height H and a sufficient approach angle α at the front portion of the wheel crane 100 are ensured. Is done.

  As described above, in this embodiment, when the attachment portion 22 of the hook portion holder 1 is attached to the hook block 4, the hook block 4 is held in a posture along the boom 106 in the lying state by the hook block holding member 107. Since the hook support portion 24 of the hook portion holder 1 supports the hook portion 6 from below so that the hook portion 6 is rotated by a predetermined angle from the vertical direction to the direction along the boom 106 from time to time, the hook block 4 Can be prevented from hanging down when the hook portion 6 is held along the boom 106 in a lying state. Thus, by preventing the hook portion 6 from drooping, even when the boom 106 is laid down to the front when the wheel crane 100 is traveling, a sufficient ground clearance can be secured. Further, since the hook portion 6 does not hang down, the boom 106 can be laid down so as to be largely inclined forward and the view from the cab 104a is prevented from being blocked by the boom 106 when the wheel crane 100 is traveling. A good field of view can be secured.

  Moreover, in this embodiment, only by attaching the attachment part 22 of the hook part holder 1 to the hook block 4, without performing complicated adjustment of the raising / lowering angle of the boom 106 or twice the raising / lowering operation of the boom 106, It is possible to prevent the hook portion 6 from hanging down. Therefore, in the present embodiment, the hook portion 6 can be prevented from drooping with a simpler operation than in the prior art.

  Further, in the present embodiment, unlike the conventional technique of fixing the hook on the lower traveling body, the hook portion 6 does not interfere with the fall of the boom 106, so that the boom 106 is greatly lowered forward. Thus, a good field of view can be secured when the wheel crane 100 is traveling.

  Therefore, according to the present embodiment, the hook portion 6 can be held by a simple operation so that a good field of view and a sufficient ground height during traveling of the wheel crane 100 can be ensured.

  Further, in the present embodiment, in a state where the hook block 4 is suspended from the distal end portion of the boom 106, the operator engages the attachment portion 22 with respect to the hook block 4 from the rear, and thereafter, A pair of connection portions 36 of the hook support portion 24 are coupled to a pair of second portions 30b which are a pair of end portions on the side into which the hook block 4 enters, and the pair of second portions 30b are connected via the hook support portion 24. By connecting to each other, the hook part holder 1 can be attached to the hook block 4. That is, according to the present embodiment, the operator can attach the attachment portion 22 of the hook portion holder 1 from the rear to the hook block 4 suspended from the tip portion of the boom 106, and an easy working posture. The installation work can be performed with. For this reason, the work burden concerning the attachment work of the attachment part 22 with respect to the hook block 4 can be reduced.

  In the present embodiment, the hook block 4 is suspended from the distal end portion of the boom 106, and the attachment portion 22 of the hook portion holder 1 is moved from the rear side of the hook block 4 to both outer sides and rear end portions of the pair of side plates 8. The hook block is engaged by straddling the edge, and then the hook support portion 24 is coupled to the pair of placement portions 30 of the attachment portion 22 and the pair of placement portions 30 are connected by the hook support portion 24. In the state where 4 is suspended, the mounting portion 30 is supported from below by the hook keeper plate 16 of the hook block 4, so that the position of the hook holder 1 is fixed with respect to the hook block 4. Is held in a posture along the boom 106 in a lying state, the connecting portion 32 is supported by a surface which becomes the upper surface of the hook block 4, thereby Holder 1 is fixed in position relative to the hook block 4. That is, in the present embodiment, the hook holder 1 can be fixed to the hook block 4 without using attachment means such as attachment screws. Therefore, in the present embodiment, the hook unit holder 1 can be easily attached to the hook block 4 without forming a screw hole or the like for fixing the hook unit holder 1 in the hook block 4. The hook holder 1 can be easily attached to the hook block 4 of the wheel crane 100 of FIG.

  Moreover, in this embodiment, since the 2nd part 30b of the mounting part 30 of the attaching part 22 and the connection part 36 of the hook support part 24 can be pin-coupled, it mounts compared with the case where it fastens, for example with a volt | bolt. The connecting operation of the mounting portion 30 and the connecting portion 36 can be easily performed.

  In the present embodiment, when the hook block 4 is suspended from the tip of the boom 106, the hook of the hook block 4 is engaged when the attachment portion 22 of the hook holder 1 is engaged with the hook block 4. The position of the mounting portion 22 can be fixed with respect to the hook block 4 by using the keeper plate 16, so that a portion for fixing the position of the mounting portion 22 needs to be separately provided on the outer surface of the side plate 8 of the hook block 4. Absent. Therefore, in this embodiment, it is possible to facilitate the retrofitting of the hook unit holder 1 to the hook block 4 while preventing an increase in the number of members constituting the hook block 4.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, as in the first modification of the above-described embodiment shown in FIGS. 11 to 13, a plurality of pin holes 36 a provided in the connection portion 36 of the hook support portion 24 are formed on the mounting portion 30 a of the mounting portion 22. The support portions 38 may be arranged at different positions in the longitudinal direction of the connection portion 36 when they are coupled by the pin hole 30c provided in the two portions 30b and the pin 26. Specifically, the connection portion 36 is provided with three pin holes 36a arranged side by side. Of the three pin holes 36a, two pin holes 36a far from the support portion 38 and the placement portion 30a. When the two pin holes 30c provided in the second portion 30b are pin-coupled (see FIG. 12), the relatively large hook portion 6 can be supported by the support portion 38 at an appropriate position, Of the three pin holes 36a, the two pin holes 36a on the side closer to the support portion 38 and the two pin holes 30c provided in the second portion 30b of the mounting portion 30a are pin-coupled (see FIG. 13). The relatively small hook portion 6 can be supported by the support portion 38 at an appropriate position.

  According to the configuration of the first modified example, if the pin hole 36a used for pin coupling is changed among the three pin holes 36a, the size of the hook part 6 can be accommodated even when the size of the hook part 6 varies. The hook portion 6 can be supported by the support portion 38 so as not to hang down at the appropriate position.

  Moreover, like the 2nd modification of the said embodiment shown in FIGS. 14-16, in the 2nd part 30b of the mounting part 30 of the attachment part 22, two pin holes 30c are made into 1 set, and 2 sets of pin holes 30c may be arrange | positioned along with the direction where the 1st part 30a is extended. In the second modification, as shown in FIG. 16, when the width of the side plate 8 of the hook block 4 is large, the pair of pin holes 30c farther from the first portion 30a of the two sets of pin holes 30c. And the two pin holes 36a provided in the connection portion 36 of the hook support portion 24 are connected to each other, so that the second portion of the placement portion 30 is secured by the pin 26 outside the one end edge in the width direction of the side plate 8. 30b and the connection part 36 can be pin-coupled. Further, in the second modification, as shown in FIG. 15, when the width of the side plate 8 of the hook block 4 is smaller than that of FIG. 16, the first portion 30a of the two sets of pin holes 30c. By connecting the pin hole 30c of the pair closer to the two pin holes 36a provided in the connecting portion 36 of the hook support portion 24, one of the two pins 26 is one of the side plates 8 in the width direction. The second portion 30b of the mounting portion 30 and the connection portion 36 can be pin-coupled at a position where they abut against the edge of the mounting portion 30. That is, in this second modification, the position where the mounting portion 30 of the mounting portion 22 and the connecting portion 36 of the hook support portion 24 are pin-coupled can be selected according to the width of the side plate 8 of the hook block 4. ing.

DESCRIPTION OF SYMBOLS 1 Hook part holder 4 Hook block 6 Hook part 8 Side plate 14 Hook support shaft 16 Hook keeper plate (support shaft holding part)
22 Mounting portion 24 Hook support portion 26 Pin 30 Placement portion 30c Pin hole 32 Connection portion 36 Connection portion 36a Pin hole 38 Support portion 106 Boom 107 Hook block holding member 108 Rope

Claims (6)

A boom that can be raised and lowered, a hook block that is suspended from a tip of the boom via a rope, and a hook block that can be pivoted about a horizontal axis to hang a suspended load. And a hook block holding member that is attached to the tip of the boom and that displaces and holds the hook block in a direction along the boom as the hook block is rolled up. A hook part holder of a wheel crane for holding the hook part,
An attachment part detachably attached to the hook block so as to surround the hook block;
A hook support part for supporting the hook part,
The attachment portion and the hook support portion are configured so that the hook portion is attached to the hook block from the vertical direction when the hook block is held in a posture along the boom in a lying state. A hook part holder for a wheel crane, wherein the hook support part is formed in a shape such that the hook support part supports the hook part from below so as to be rotated by a predetermined angle in a direction along the direction. The mounting portion has an opening that allows the hook block to enter in a direction perpendicular to a direction in which the rotation axis of the hook portion extends and in a horizontal direction in a state in which the hook block is suspended from the tip of the boom. Have
The hook portion of the wheel crane according to claim 1, wherein the hook support portion is detachably coupled to a pair of end portions on the side into which the hook block enters in the attachment portion, and the end portions are connected to each other. Retaining tool. The hook part holder is disposed as a hook block spaced apart from each other in the direction in which the rotation axis of the hook part extends, and includes a pair of side plates constituting both outer side surfaces of the hook block, and the pair of side plates. A hook support shaft that is provided so as to pass through and supports the hook portion between the pair of side plates, and protrudes from the outer surface of each side plate, and supports a corresponding end portion of the hook support shaft in a rotatable manner. And is attached to a hook block having a support shaft holding part,
The attachment portions are arranged so as to sandwich the pair of side plates from both outer sides, and are respectively placed on the corresponding support shaft holding portions in a state where the hook blocks are suspended from the tip end portions of the booms. A pair of placement portions, and a connecting portion that contacts the upper surface of the hook block held in a posture along the boom in a lying state and connects the pair of placement portions to each other;
The hook support portion is detachably coupled to the pair of placement portions at a position opposite to the connection portion with respect to the hook block, and connects the pair of placement portions to each other. Hook part holder for wheel cranes. The hook support part has a pair of connection parts detachably coupled to the pair of placement parts,
The mounting portion and the connecting portion are each provided with a pin hole,
The hook part holder for a wheel crane according to claim 3, wherein the placement part and the connection part are coupled to each other by inserting a pin into the pin hole of the placement part and the pin hole of the connection part. . The hook support portion connects the pair of connection portions to each other, and when the hook block is held in a posture along the boom in a lying state, the hook portion is moved from the vertical direction to the direction along the boom by a predetermined angle. Having a support portion for supporting the hook portion from below so as to be in a rotated posture;
One of the placement part and the connection part is provided with a plurality of the pin holes,
The plurality of pin holes are arranged so that the support portions are arranged at different positions when they are combined by the pin hole provided on the other of the mounting part and the connection part and the pin. The hook part holder of the wheel crane of Claim 4 which is. A hook device for a wheel crane that can be hung from the tip of a boom that can be raised and lowered on a wheel crane,
A hook block that is suspended from the tip of the boom via a rope,
A hook portion that is rotatably attached to the hook block around a horizontal axis, and for hanging a suspended load;
A hook part holder according to any one of claims 3 to 5,
The hook block is disposed so as to be separated from each other in a direction in which the rotation axis of the hook portion extends, and is provided so as to penetrate a pair of side plates constituting both outer side surfaces of the hook block, and the pair of side plates, A hook support shaft that supports the hook portion between the pair of side plates, and a support shaft holding portion that protrudes from the outer surface of each side plate and rotatably supports a corresponding end portion of the hook support shaft. Have
The pair of mounting portions of the mounting portion are disposed so as to sandwich the pair of side plates from both outer sides, and the corresponding support shafts in a state where the hook block is suspended from the tip end portion of the boom. Placed on the holding part,
The connecting portion abuts on the upper surface of the hook block held in a posture along the boom in a lying state, and connects the pair of mounting portions to each other.
A hook device for a wheel crane, wherein the hook support portion is detachably coupled to the pair of placement portions at a position opposite to the connection portion with respect to the hook block, and couples the pair of placement portions to each other. .

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