JP6571490B2 - Hook device and vehicle-mounted crane equipped with the same - Google Patents

Description

  The present invention relates to a hook device for suspending a load in a crane, and more particularly to a hook device suitable for a vehicle-mounted crane.

This type of hook device includes a trunnion having a flat upper surface, and a hook that is rotatably supported around a vertical axis at the center of the trunnion. The upper surface of the trunnion is processed into a flat surface so as to facilitate post-processing such as a through hole of a hook to be supported and a thrust bearing mounting hole.
Cylindrical fitting parts are provided on both the left and right sides of the trunnion, and sheaves are attached to the proximal end sides of the left and right fitting parts so as to be rotatable about the horizontal axis of the trunnion. A side plate is rotatably fitted to the distal end side.
The upper ends of the left and right side plates are connected to each other by a connecting plate. A wire rope from a sheave provided at the tip of the boom is hung on the left and right sheaves, and the hook device is suspended from the tip of the boom of the crane by this wire rope (see, for example, Patent Document 1).

Here, the vehicle-mounted crane has a specification in which, when traveling, a hook device is fixed by hanging a wire rope for hooking between a hook of the hook device and a hook hook provided on the vehicle side. However, in this type of vehicle-mounted crane, the side plate swings while the vehicle is running, the side plate rotates relative to the trunnion, the connecting plate at the upper end of the hook device hits the wire rope, and the connecting plate and the wire rope There is a risk of damage.
Therefore, for example, in the hook device described in Patent Document 1, a restricting tool is provided between the left and right side plates and the trunnion so as to press the side surfaces of the trunnion and restrict mutual rotation. According to the hook device described in the same document, since the side surface of the trunnion is pressed by the restricting tool, the rotation of the side plate with respect to the trunnion is restricted to reduce the shaking of the side plate while the vehicle is running, and the wire rope and the connecting plate Damage can be prevented.

JP 2000-103588 A

However, in the hook device described in Patent Document 1, the restricting tool presses the side surface of the trunnion and restricts the rotation of the side plate with respect to the trunnion. Interference with the control device itself must be prevented. For this reason, there is a problem that a useless space in the rotation range is required to mount the restricting tool, and the hook device is enlarged to secure the space.
Therefore, the present invention has been made paying attention to such problems, and restricts the rotation of the side plate with respect to the trunnion and does not require an interference prevention space corresponding to the rotation range of the side plate. It is an object of the present invention to provide a hook device including a restricting tool that can be configured in a compact manner and a vehicle-mounted crane including the same.

In order to solve the above-described problem, a hook device according to an aspect of the present invention includes a trunnion having a flat upper surface, a hook that is rotatably supported around a vertical axis at a central portion of the trunnion, A sheave that is rotatably mounted around the horizontal axis on both the left and right sides of the trunnion and a wire rope is wound around, and a side plate that is fitted to each of the left and right ends of the trunnion so as to be rotatable about the horizontal axis; A connecting plate that connects the upper end portions of the left and right side plates; and a restricting tool that restricts the rotation of the side plate and the trunnion around the horizontal axis. The restricting tool includes an upper surface of the trunnion. And a pair of pressing arms that are elastically arranged to press a point-symmetrical position with respect to the center of the vertical axis of the hook by the force of a spring.
In order to solve the above problems, a vehicle-mounted crane according to an aspect of the present invention includes the hook device according to an aspect of the present invention.

  Here, in the hook device according to an aspect of the present invention, the restricting tool includes a pair of bridge plates and a pair of torsion coil springs attached to each of the pair of bridge plates. A main body part connecting the upper ends of the inner parts of the left and right side plates, a first arm part projecting from the main body part toward the center side of the vertical axis of the hook, and the horizontal axis from the tip of the first arm part A second arm portion projecting sideways along the torsion coil spring, and the torsion coil spring is formed of a single spring material and latched on the first arm portion. A cylindrical coil portion continuously formed on the latching portion so as to surround the second arm portion and continuously formed on a distal end side of the cylindrical coil portion, and the trunnion of the trunnion Having the pressing arm pressing the flat upper surface Masui.

  Further, in the hook device according to one aspect of the present invention, when the pair of torsion coil springs are at a predetermined relative position where the hook is positioned directly below the side plate, As seen, the upper surface of the trunnion, which is arranged so as to be point-symmetric with respect to the center point on the vertical axis of the hook and is pressed by one of the pair of torsion coil springs, borders the vertical axis of the hook. And one end in the axial direction of the horizontal axis of the trunnion, which is half the area from the center of the horizontal axis, from the bent portion formed in the middle portion of the pressing arm of the one torsion coil spring The other torsion coil spring is on the opposite side that is point-symmetric with respect to the center point of the vertical axis of the hook, and is half of the upper surface of one side. And it is preferably disposed as pressed against the full length to the tip from the pressing bending portion formed in the middle portion of the arm of the other of the torsion coil spring.

Further, in the hook device according to one aspect of the present invention, the state in which the pressing arms of the pair of torsion coil springs press the trunnion when the side plate is tilted is, among the pair of torsion coil springs, The one torsion coil spring presses a corner of the upper surface of the trunnion at a portion closer to the base end side than the bent portion of the pressing arm, and the other torsion coil spring presses the upper surface of the trunnion at the bent portion of the pressing arm. It is preferable to press.
Further, in the hook device according to one aspect of the present invention, when the side plate is inclined, the portion that presses the upper surface of the trunnion by the pressing arm of the pair of torsion coil springs is pressed by the pair of torsion coil springs. Both the arms are on the same side as the side plate is lowered by rotation, and the upper surface of the trunnion is moved from the left and right with the central axis of the hook to the predetermined relative position by the cooperation of a pair of torsion coil springs. It is preferable to urge toward the returning side.

  According to the present invention, the restricting tool has a pair of pressing arms that are elastically pressed so that the flat upper surface of the trunnion presses a point-symmetrical position with respect to the center of the vertical axis of the hook by the force of the spring. The rotation of the side plate relative to the trunnion can be restricted by the pressing force of the pair of pressing arms that presses the point-symmetrical position with the force of the spring. And since a pair of press arm presses the flat upper surface of a trunnion, the interference prevention space corresponding to the rotation range of a side plate is unnecessary, and it can comprise compactly.

It is a figure explaining one Embodiment of the crane for vehicle mounting equipped with the hook apparatus which concerns on 1 aspect of this invention, The figure has shown the retracted state of the hook apparatus at the time of driving | running | working. It is explanatory drawing of the hook apparatus of FIG. 1, In this figure, while showing the cross section along the axis line of a trunnion axis | shaft, the base end part of the hook is shown by the fracture surface along the axis line. It is a left view of the hook apparatus of FIG. It is a figure which shows the cross section along a hook center when the hook apparatus of FIG. 2 is seen from a right side surface. It is AA sectional drawing of FIG. It is explanatory drawing of the bridge board which comprises a control tool, The same figure (a) is a top view, (b) is a right view of (a). It is a perspective view explaining a restricting tool, the figure (a) shows the state where each part which constitutes the restricting tool was disassembled, and (b) shows the state where each part was assembled. It is a figure explaining operation | movement of the hook apparatus of FIG. 1, and the figure has shown the state which the side plate rotated to the same figure counterclockwise with respect to the hook. It is a figure explaining operation | movement of the hook apparatus of FIG. 1, and the figure has shown the state which the side plate rotated to the figure clockwise direction with respect to the hook.

  Hereinafter, an embodiment of a hook device according to an aspect of the present invention will be described with reference to the drawings as appropriate. The drawings are schematic. For this reason, it should be noted that the relationship between the thickness and the planar dimension, the ratio, and the like are different from the actual ones, and the dimensional relationship and the ratio are different between the drawings. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, and arrangement of components. Etc. are not specified in the following embodiments.

First, an embodiment of a vehicle-mounted crane equipped with a hook device will be described.
As shown in FIG. 1, the vehicle-mounted crane 50 has a base 51 connected and fixed on a chassis frame 62 at the rear of a cab 61 of the vehicle 60. A column 52 is turnably provided on the base 51, and a boom 53, which is a multistage telescopic boom, is pivotally supported at the upper end portion of the column 52.
Further, the column 52 is provided with a winch 54 at an upper portion thereof, and the wire rope 8 is guided from the winch 54 to the distal end portion 53 s of the boom 53, and the hook device 1 is connected via the sheave 55 of the distal end portion 53 s of the boom 53. The hook device 1 is suspended from the distal end portion 53 s of the boom 53 by being hung around. Here, when the vehicle-mounted crane 50 runs, the vehicle-mounted crane 50 hangs the hook device wire rope 64 between the hook 3 of the hook device 1 and the hook device 63 provided on the vehicle side, and the hook device 1 is moved. It is fixed.

Hereinafter, the hook device 1 will be described in detail.
As shown in FIG. 2, the hook device 1 includes a trunnion 2 having a flat upper surface and a hook 3 supported on a central portion of the trunnion 2. The hook 3 is supported at the central portion of the trunnion 2 through the thrust bearing 4 so as to be rotatable around the vertical axis Cf and not to be pulled down by the hook retaining stopper 5. The trunnion 2 is flattened so as to have a smooth upper surface so that post-processing such as a through-hole of the hook 3 to be supported and a thrust bearing 4 mounting hole can be easily performed.
Cylindrical fitting portions 15 are respectively provided on the left and right sides of the trunnion 2, and the sheaves 7 are respectively attached to the proximal end sides of the left and right fitting portions 15. Each sheave 7 is supported via a radial bearing 6 so as to be rotatable about a horizontal axis Ct of the trunnion 2. A wire rope 8 from a sheave 55 provided at the tip 53s of the boom 53 is hung on the left and right sheaves 7, and the hook device 1 can be suspended from the tip of the boom 13 of the crane by the wire rope 8. It has become.

Side plates 9 are rotatably fitted to the distal ends of the fitting portions 15 at both the left and right ends of the trunnion 2, respectively. As shown in FIG. 3, a retaining plate 10 that prevents the side plate 9 from being pulled out to the side is attached to each of the left and right end surfaces of the fitting portion 15 by retaining bolts 11.
The left and right side plates 9 are integrally formed with an inner portion 29 that covers the inside of the sheave 7. The upper end portions of the left and right side plates 9 are connected to each other by a connecting plate 12. Furthermore, the upper ends of the inner portions 29 of the left and right side plates 9 are connected to each other by a pair of bridge plates 30.

In this specification, the normal state in which the hook 3 is located directly below the side plate 9 shown in FIGS. 2 to 4 is referred to as “predetermined relative position” between the trunnion 2 and the side plate 9. In this “predetermined relative position”, the trunnion 2 usually faces the direction in which the hook 3 connected downward is suspended vertically, and the side plate 9 is in a position where the connecting plate 12 is directly above.
The trunnion 2 and the side plate 9 are rotatably fitted to each other because it is difficult to incline the entire hook device 1 when hooking a wire rope on the load side on the hook 3. This is because only the hook 3 can be tilted with respect to the plate 9 to facilitate the sling operation.

  Here, the hook device 1 includes a restricting tool 40 that restricts the rotation of the side plate 9 and the trunnion 2 around the axis Ct of the trunnion 2. As shown in FIGS. 2 and 4, the restricting tool 40 of the present embodiment includes a pair of bridge plates 30 and a pair of torsion coil springs 16 that are respectively attached to the pair of bridge plates 30. Each torsion coil spring 16 has a pressing arm 16c, and the pair of torsion coil springs 16 has a smooth upper surface 2t of the trunnion 2 and a vertical axis of the hook 3 as shown in FIG. It is installed so as to press a point-symmetrical position with respect to the center O of Cf by the force of the spring.

Specifically, as shown in FIG. 5, each bridge plate 30 includes a rectangular main body 33 that connects the upper ends of the inner sides of the left and right side plates 9, and a center O of the vertical axis Cf of the hook 3 from the main body 33. A first arm portion 31 projecting obliquely upward toward the side, and a second arm portion 32 projecting laterally (opposite to each other) along the horizontal axis Ct from the tip of the first arm portion 31. (See also FIG. 6). Each bridge plate 30 has a main body 33 fixed to the upper end of the inner side of the side plate 9 by two mounting bolts 36.
Each torsion coil spring 16 is formed entirely from a single wire for spring, and has a substantially U-shape that is hooked on the first arm portion 31 of the bridge plate 30 as shown in FIGS. A latching portion 16a, a cylindrical coil portion 16b that is formed so that the proximal end side is continuously formed on the latching portion 16a and that surrounds the second arm portion 32 of the bridge plate 30, and a distal end of the cylindrical coil portion 16b And a pressing arm 16c that is continuously formed on the side and elastically presses the smooth upper surface 2t of the trunnion 2.

The cylindrical coil portion 16b is supported at a position higher than the upper surface 2t of the trunnion 2 by the second arm portion 32, and the pressing arm 16c is directed downward from a position higher than the upper surface 2t of the trunnion 2 toward the trunnion 2. It projects so as to be orthogonal to the direction of the axis Ct.
Then, as shown in FIG. 7, the pressing arm 16c has a slight bent portion 16d at the middle portion so that the upper surface 2t of the trunnion 2 can be sequentially pressed over its entire length when the side plate 9 is rotated. It is formed. As a result, each torsion coil spring 16 is pushed by the pressing arm 16c at the “predetermined relative position”, as shown in FIG. 4, over the entire length of the trunnion 2 from the bent portion 16d to the tip of the pressing arm 16c. Press 2t.

As shown in FIGS. 8 and 9, when the side plate 9 is tilted, one of the torsion coil springs 16 has an upper surface 2t of the trunnion 2 at one point on the proximal side with respect to the bent portion 16d of the pressing arm 16c. The other side presses the upper surface 2t of the trunnion 2 at one point of the bending portion 16d of the pressing arm 16c.
In this way, each torsion coil spring 16 can press the upper surface 2t of the trunnion 2 over its entire length by the pressing arm 16c following the change in posture at the time of rotation, so that the trunnion 2 is well balanced with a wide contact area. The upper surface 2t can be pressed.

In particular, as shown in FIG. 5, the pair of left and right torsion coil springs 16 according to the present embodiment are configured so that the hook 3 is viewed from above at the “predetermined relative position” where the hook 3 is located directly below the side plate 9. 3 are arranged so as to be point-symmetric with respect to the center point O on the vertical axis Cf.
As a result, of the left and right torsion coil springs 16, the upper surface 2t portion of the trunnion 2 that is pressed by one torsion coil spring 16 is one side in the axial direction of the horizontal axis Ct of the trunnion 2 with the vertical axis Cf of the hook 3 as a boundary. Thus, either the left or right half of the center of the axis Ct is pressed by the entire length from the bent portion 16d to the tip of the pressing arm 16c, and the other torsion coil spring 16 is pointed with respect to the center point O of the vertical axis Cf of the hook 3. On the opposite side that is symmetric, it is arranged so that half of the upper surface of one side is pressed by the entire length from the bent portion 16d to the tip of the pressing arm 16c.

Next, the operation and effect of the hook device 1 will be described.
As shown in FIG. 1, when the vehicle 60 travels, the vehicle-mounted crane 50 hangs a hook-hanging wire rope 64 between the hook 3 of the hook device 1 and a hook hook 63 provided on the vehicle side. The hook device 1 is fixed.
Here, when the side plate 9 is shaken while the vehicle 60 is traveling and the side plate 9 is about to rotate with respect to the trunnion 2, according to the hook device 1 of the present embodiment, the side plate 9 rotates with respect to the trunnion 2. The movement is restricted by the pressing force of the pair of torsion coil springs 16 included in the restriction tool 40.
In other words, the restricting tool 40 according to the present embodiment allows the side plate 9 to move to the trunnion 2 while the pressing force acting between the trunnion 2 and the side plate 9 is restored to the current position by the restoring force of the pair of torsion coil springs 16. Therefore, the side plate 9 does not tilt with respect to the trunnion 2 and is maintained at a “predetermined relative position”.

When a force larger than the force that holds the restoring force of the pair of torsion coil springs 16 is applied between the trunnion 2 and the side plate 9, the side plate 9 is once moved against the trunnion 2 as shown in FIGS. Can be rotated. Therefore, when the hooking operation is performed, if the hook 3 is tilted rapidly, the hooking can be performed without tilting the entire hook device 1.
When the force to be held against the restoring force of the pair of torsion coil springs 16 is released, the force immediately returns to the “predetermined relative position” by the elastic force of the deformed torsion coil spring 16. Therefore, the vibration of the side plate 9 during traveling of the vehicle 14 is reduced, and the connection plate 12 and the wire rope 8 are prevented from being damaged.

  Here, when the side plate 9 is inclined, as shown in FIGS. 8 and 9, the state in which the pressing arms 16c of the pair of left and right torsion coil springs 16 elastically press the trunnion 2 is the left and right torsion coil springs. 16, one torsion coil spring 16 presses the corner of the upper surface 2 t of the trunnion 2 at one point on the proximal end side with respect to the bending portion 16 d of the pressing arm 16 c, and the other torsion coil spring 16 corresponds to the pressing arm 16 c. The upper surface 2t of the trunnion 2 is pushed at one point of the bent portion 16d.

  However, the pressing point of the upper surface 2t by the pressing arms 16c of the two torsion coil springs 16 is the same side as the side on which the side plate 9 is lowered by the rotation of the left and right torsion coil springs 16 and hooks the upper surface 2t of the trunnion 2 3 central axis Cf is urged from the left and right crotch. For example, as shown in FIG. 9, when the side plate 9 rotates and falls to the right, the upper surface 2 t on the right side of the trunnion 2 on the same side is attached to the two torsion coil springs 16 from the left and right. Rush. Therefore, the force for returning to the “predetermined relative position” can be efficiently applied.

  When the side plate 9 returns to the original “predetermined relative position”, as described above, one of the left and right torsion coil springs 16 is on one side in the axial direction with the vertical axis Cf of the hook 3 as a boundary, and the trunnion 2 One half from the center of the horizontal axis Ct is pressed by the entire length of the pressing arm 16c (the tip side from the bent portion 16d), and the other half is point-symmetric with respect to the center point of the vertical axis Cf of the hook 3. The half is pressed down by the full length of the pressing arm 16c (full length portion from the bent portion 16d to the tip).

  As described above, according to the restriction tool 40 of the present embodiment, the pair of torsion coil springs 16 are attached to the positions between the pair of bridge plates 30, and the upper surface 2 t of the trunnion 2 is viewed from above from the vertical axis Cf of the hook 3. Since the position symmetrical with respect to the center O of the side plate 9 is suppressed, the rotation of the side plate 9 relative to the trunnion 2 is restricted, and an interference prevention space corresponding to the rotation range of the side plate 9 is unnecessary. Moreover, since the restricting tool 40 of this embodiment has a simple structure with a small number of parts, the restricting tool 40 and the hook device 1 can be configured in a compact manner.

Further, when the restricting tool 40 is provided so as to press the upper surface 2t of the trunnion 2 from above the trunnion 2, the assembly of the restricting tool 40 is performed as compared with the case where the restricting tool is provided in a narrow space between the side plate 9 and the hook 3. Can be easily performed. Moreover, there is no possibility that the space for the attachment is expanded and the hook device 1 itself is enlarged.
In particular, in the trunnion type hook device, because of the structure, there is a space between the left and right sheaves above the trunnion 2, so that the restriction tool 40 of the present embodiment can effectively use the space. So it is optimal for efficiency.
The hook device according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the example in which the torsion coil spring 16 is used as the pressing arm of the restricting tool has been described. However, the present invention is not limited to this, and a plate spring may be used instead of the torsion coil spring 16.

Reference Signs List 1 hook device 2 trunnion 3 hook 4 thrust bearing 5 hook retaining 6 radial bearing 7 sheave 8 wire rope 9 side plate 10 retaining plate 12 connecting plate 15 fitting portion 16 torsion coil spring 29 inner portion 30 bridge plate 31 first arm portion 32 Second arm portion 33 Main body portion 34 Locking portion 36 Mounting bolt 40 Restriction tool 50 Vehicle-mounted crane 51 Base 52 Column 53 Boom 54 Winch 55 Sheave 60 Vehicle 61 Driver's cab 62 Chassis frame 63 Hook hanging 64 Hook hanging wire rope

Claims (6)

A trunnion whose upper surface is flat, a hook that is rotatably supported around a vertical axis at the center of the trunnion, and a left and right side of the trunnion that is rotatably mounted around a horizontal axis and has a wire rope hung A sheave to be rotated, a side plate that is rotatably fitted around each of the left and right ends of the trunnion, a connecting plate that connects upper ends of the left and right side plates, and the horizontal shaft A regulating tool for regulating the rotation of the side plate and the trunnion between each other,
The restricting tool has a pair of pressing arms that are elastically arranged so as to press the upper surface of the trunnion to a point-symmetrical position with respect to the center of the vertical axis of the hook by the force of a spring. apparatus. The restrictor includes a pair of bridge plates and a pair of torsion coil springs attached to the pair of bridge plates,
The bridge plate includes a main body that connects upper ends of the inner sides of the left and right side plates, a first arm that projects from the main body toward the center of the vertical axis of the hook, and the first arm. A second arm portion protruding laterally along the horizontal axis from the tip of the
The torsion coil spring is formed of a single spring material, and has a latching portion that is latched on the first arm portion, and a base end side that is continuously formed on the latching portion. The cylindrical coil portion mounted so as to surround the two arm portions, and the pressing arm that is continuously formed on the distal end side of the cylindrical coil portion and presses the upper surface of the trunnion. The hook device according to 1. The pair of torsion coil springs is pointed with respect to a center point on the vertical axis of the hook when viewed from above the hook device when the hook is in a predetermined relative position with respect to the side plate. Arranged symmetrically,
Of the pair of torsion coil springs, one torsion coil spring is the upper surface of the trunnion, and the horizontal axis line on one side in the axial direction of the horizontal axis line of the trunnion, with the vertical axis of the hook as a boundary. The left or right half of the area from the center of the one torsion coil spring is pressed down with the entire length from the bent portion to the tip formed in the middle of the pressing arm of the one torsion coil spring,
The other torsion coil spring is on the opposite side that is point-symmetric with respect to the center point of the vertical axis of the hook, and half of the upper surface of one side is formed in the middle part of the pressing arm of the other torsion coil spring. The hook device according to claim 2, wherein the hook device is arranged so as to be pressed with a full length from a bent portion to a tip.   When the side plates are inclined, the state in which the pressing arms of the pair of torsion coil springs press the trunnion is that one of the pair of torsion coil springs is a bent portion of the pressing arm. The corner of the upper surface of the trunnion is pressed at a portion closer to the base end, and the other torsion coil spring presses the upper surface of the trunnion at a bent portion of the pressing arm. The hook device described. When the side plate is inclined, the location where the upper surface of the trunnion is pressed by the pressing arms of the pair of torsion coil springs is the side on which the side plate is lowered by the rotation of the pressing arms of the pair of torsion coil springs. On the same side,
The upper surface of the trunnion is urged from the left and right with the central axis of the hook crotated toward the side returning to the predetermined relative position by cooperation of a pair of torsion coil springs. The hook apparatus as described in any one of.   A crane for mounting on a vehicle, comprising the hook device according to any one of claims 1 to 5.

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