JP2000103588A - Hook device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a wire rope from being damaged by regulating the turn of a side plate relative to a trunnion to reduce the oscillation of the side plate while a vehicle is traveling. SOLUTION: In a hook device 1 in which a hook 3 is turnably supported by a center part of a trunnion 2, a sheave 7 around which a wire rope 8 is wound is rotatably fitted to the right and left sides of the trunnion 2, a side plate 9 is turnably fitted to right and left end parts of the trunnion 2, and upper end parts of the right and left side plates are connected to each other through a connection plate 12, a wire spring 16 to regulate the mutual turn is provided between the side plate 9 and the trunnion 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook device for hanging a load on a crane.

[0002]

2. Description of the Related Art As shown in FIGS. 12 to 15, in a conventional hook device 101, a hook 3 is rotatable around a vertical axis via a thrust bearing 4 at a central portion of a trunnion 2, and a hook stopper 5 is provided. It is supported so that it does not fall down.

[0003] Sheaves 7 are mounted on both right and left sides of the trunnion 2 via radial bearings 6 so as to be rotatable about the axis of the trunnion 2. A wire rope 8 from a sheave (not shown) provided at the tip of the crane boom is hung on the left and right sheaves 7, and the hook device 101 is suspended from the tip of the crane boom by the wire rope 8. Have been.

Side plates 9 are rotatably fitted to the left and right ends of the trunnion 2, respectively, and the left and right end surfaces of the trunnion 2 are used to prevent the side plates 9 from being pulled out sideways. A retaining plate 10 is attached with retaining bolts 11. Inner portions 29 that cover the inside of the sheave 7 are formed integrally with the left and right side plates 9.

The upper ends of the left and right side plates 9 are connected to each other by a connecting plate 12. 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 way, trunnion 2
And the side plate 9 are rotatably fitted to each other because it is difficult to incline the entire hook device 101 when hanging the wire rope on the hanging load side on the hook 3.
This is because only the hook 3 can be tilted with respect to the side plate 9 to facilitate the slinging operation.

[0006]

By the way, in the vehicle mounted crane 13 as shown in FIG. 16, when the vehicle is running, a hook hook is provided between the hook 3 of the hook device 101 and the hook hook 20 provided on the vehicle 14 side. Although the hook device 101 is fixed by hanging the wire rope 19, the side plate 9 swings and rotates with respect to the trunnion 2 during traveling of the vehicle 14, and the connecting plate 12 at the upper end of the hook device 101 connects the wire rope. 8, the connecting plate 12 and the wire rope 8 are damaged.

On the other hand, in order to prevent the side plate 9 from swinging and rotating with respect to the trunnion 2 during traveling, the fitting of the fitting portion 15 between the trunnion 2 and the side plate 9 can be freely rotated. If the side plate 9 is tilted with respect to the trunnion 2 as shown in FIG. May not return to the normal state. In such a state, the connecting plate 12 of the hook device 101 hits the wire rope 8 and the connecting plate 12 and the wire rope 8 are worn or damaged.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem in a crane hook device, and restricts the rotation of a side plate with respect to a trunnion so as to reduce the swing of the side plate during running of a vehicle, and to reduce a wire rope and a connection. An object of the present invention is to provide a hook device that can prevent damage to a plate.

[0009]

The hook device of the present invention comprises:
A hook is rotatably supported at the center of the trunnion, and sheaves around which wire ropes are hung on the right and left sides of the trunnion are rotatably mounted. Side plates are rotatably fitted to the left and right ends of the trunnion, respectively. A hook device in which the upper ends of the left and right side plates are connected to each other by a connecting plate, and a restricting member for restricting mutual rotation is provided between the side plate and the trunnion.

With this configuration, in the hook device of the present invention, the rotation of the side plate with respect to the trunnion is restricted, and while the force acting between the two is within the range of the predetermined restricting force, the side plate is not moved. Since the side plate moves following the movement of the trunnion, the side plate does not tilt with respect to the trunnion, and a predetermined relative positional relationship is maintained.

When a large force acts between the two, the side plate once inclines with respect to the trunnion, but immediately returns to a predetermined relative positional relationship by the elastic force of the restrictor. Therefore, the swing of the side plate during running of the vehicle is reduced,
The connecting plate and the wire rope are prevented from being damaged.

In the staking operation, the trunnion can be rotated with respect to the side plate by rapidly moving the hook, so that the staking can be performed without tilting the entire hook device. The restricting device of the hook device is provided with a restricting device bracket between a pair of bridge plates connecting the upper ends of the inner portions of the left and right side plates, and a pair of holding arms that are biased by a spring and hold the trunnion are attached to the restricting device bracket. If it is constructed so as to be pivotally supported, the restricting device can be easily assembled.

[0013] Further, by connecting the pair of bridge plates with the restrictor bracket, rigidity between the left and right side plates is improved.

[0014]

FIG. 1 is a longitudinal sectional view of a hook device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. FIG. 4 is an explanatory view of the operation of the hook during the slinging operation.

Here, the basic configuration of the hook device 1 is as follows.
This is the same as the conventional hook device 101 shown in FIGS. That is, the hook 3 is supported at the center of the trunnion 2 via the thrust bearing 4 so as to be rotatable around a vertical axis and is prevented from dropping downward by the hook stopper 5.

Sheaves 7 are attached to the right and left sides of the trunnion 2 via radial bearings 6 so as to be rotatable about the axis of the trunnion 2. A wire rope 8 from a sheave provided at the tip of a crane boom 13 is wrapped around the left and right sheaves 7, and the hook device 1 is connected to the crane boom 1 by the wire rope 8.
3 is hung from the tip.

Side plates 9 are rotatably fitted to the left and right ends of the trunnion 2, respectively. The left and right ends of the trunnion 2 are for preventing the side plates 9 from being pulled out sideways. A retaining plate 10 is attached with retaining bolts 11. Inner portions 29 that cover the inside of the sheave 7 are formed integrally with the left and right side plates 9.
The upper ends of the left and right side plates 9 are connected to each other by a connection plate 12. 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.

A wire spring 16 is provided between the side plate 9 and the trunnion 2 as a restricting member for restricting mutual rotation. The wire spring 16 has a shape in which J-shapes are symmetrically connected as shown in FIG.
The lower center of the trunnion 2 is attached to the lower portion of the inner portion 29 of the side plate 9 by an attachment bolt 17, and the upper portion of the wire spring 16 elastically holds the side surface of the trunnion 2 having a rectangular cross section.

The trunnion 2 is formed by the wire spring 16.
Of the side plate 9 is restricted, and while the force acting between them is within the range of the regulating force of the wire spring 16, the side plate 9 moves following the movement of the trunnion 2. The side plate 9 does not tilt with respect to the trunnion 2 and is kept in a predetermined relative positional relationship.
Normally, the trunnion 2 faces the direction in which the hook 3 connected downward is vertically suspended, and the side plate 9 is held at a position where the connection plate 12 is directly above.

When a large force acts between the two, the side plate 9 once tilts with respect to the trunnion 2 as shown in FIG. 3, but immediately returns to a predetermined relative positional relationship by the elastic force of the deformed wire spring 16. Therefore, the swing of the side plate 9 during traveling of the vehicle 14 is reduced, and damage to the connecting plate 12 and the wire rope 8 is prevented.

At the time of sling work, if the hook 3 is tilted rapidly or the hook 3 is tilted at a certain angle or more,
As shown in FIG. 4, the upper part of the wire rod spring 16 is opened and the trunnion 2 is opened.
Can be rotated with respect to the side plate 9, so that slinging can be performed without tilting the entire hook device 1 as in the related art.

As the restricting member, a leaf spring may be used instead of the wire spring 16. Further, the structure shown in FIGS. 5 and 6 may be employed. Here, a pair of holding arms 21 and 22 are provided between the side plate 9 and the trunnion 2 as a regulating tool for regulating mutual rotation. The lower ends of the holding arms 21 and 22 are rotatably attached to the lower portion of the inner portion 29 of the side plate 9 with mounting bolts 23, and a coil spring 24 is mounted between the holding arms 21 and 22. The upper portions of the arms 21 and 22 elastically hold the side surfaces of the trunnion 2 having a rectangular cross section.

Further, the restricting tool may have a structure as shown in FIGS. Here, a pair of restricting brackets 31 for connecting the pair of bridge plates 30 is provided between a pair of bridge plates 30 for connecting the upper ends of the inner portions 29 of the left and right side plates 9. A pair of pinching arms 32 and 33 are
It is pivoted at. A coil spring 35 is mounted on the pin 34, and the ends of the coil spring 35 are engaged with the holding arms 32, 33, respectively. The lower portions of the pair of holding arms 32, 33 are formed by the coil spring 35. The trunnion 2 is urged to elastically hold the side surface of the trunnion 2.

The rotation of the side plate 9 with respect to the trunnion 2 is restricted by the holding arms 32 and 33. While the force acting between the two is within the range of the restriction force of the coil spring 35, the side plate 9 9 is trunnion 2
, The side plate 9 is not inclined with respect to the trunnion 2 and a predetermined relative positional relationship is maintained. Normally, the trunnion 2 faces the direction in which the hook 3 connected below is hung vertically, and the side plate 9 is held at a position where the connecting plate 12 is directly above.

When a large force acts between the two, FIG.
As described above, the side plate 9 is once inclined with respect to the trunnion 2, but immediately returns to a predetermined relative positional relationship by the elastic force of the deformed coil spring 35. Therefore, the swing of the side plate 9 during traveling of the vehicle 14 is reduced, and the connecting plate 12
And the wire rope 8 is prevented from being damaged.

At the time of slinging work, if the hook 3 is tilted rapidly or the hook 3 is tilted at a certain angle or more,
As shown in FIG. 11, the lower portions of the pair of holding arms 32 and 33 are opened and the trunnion 2 can be rotated with respect to the side plate 9, so that slinging can be performed without tilting the entire hook device 1 as before. it can.

When the restricting device is provided on the upper part as described above, FIG.
As shown in FIG. 5 and FIG.
The restrictor can be easily assembled as compared with the case where the restrictor is provided in a narrow space between the hook and the hook 3. There is no danger of increasing the size of the hook device 1 itself by increasing the space for mounting.

Further, by connecting the pair of bridge plates 30 with the restrictor brackets 31, the left and right side plates 9 are formed.
The rigidity between them is improved.

[0029]

As described above, in the hook device of the present invention, since the rotation of the side plate with respect to the trunnion is restricted, the swing of the side plate during traveling of the vehicle can be reduced.

Further, since the rotation of the side plate with respect to the trunnion is restricted, and the side plate is maintained in a predetermined relative positional relationship without tilting with respect to the trunnion.
The connecting plate and the wire rope are prevented from being damaged. At the time of slinging operation, the trunnion can be rotated with respect to the side plate by moving the hook suddenly or by inclining the hook 3 at a certain angle or more, so that the entire hook device is not inclined as before. Slinging can be performed.

The restricting device of the hook device has a restricting member bracket provided between a pair of bridge plates connecting the upper ends of the inner portions of the left and right side plates, and controls a pair of holding arms which are biased by a spring to hold the trunnion. When it is configured to pivotally support the tool bracket, the restricting tool can be easily assembled.

Further, by connecting the pair of bridge plates with the restrictor bracket, the rigidity between the left and right side plates is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal section of a hook device showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram of the operation of the hook device.

FIG. 4 is an explanatory view of the operation of a hook during a slinging operation.

FIG. 5 is a longitudinal sectional view of a hook device provided with a pair of holding arms as regulating tools.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a longitudinal sectional view of a hook device in which a pair of holding arms are provided between upper bridge plates as regulating tools.

FIG. 8 is a sectional view taken along line CC of FIG. 7;

FIG. 9 is a sectional view taken along line DD of FIG. 7;

FIG. 10 is an explanatory diagram of the operation of the hook device.

FIG. 11 is an explanatory diagram of an operation of a hook during a slinging operation.

FIG. 12 is a front view of a conventional hook device.

FIG. 13 is a sectional view taken along line EE of FIG. 12;

FIG. 14 is a sectional view taken along line FF of FIG. 13;

FIG. 15 is a sectional view taken along line GG of FIG. 12;

FIG. 16 is an explanatory diagram showing a stored state of the hook device during traveling.

FIG. 17 is an explanatory view showing a state in which the side plate is inclined with respect to the trunnion in the conventional hook device.

[Explanation of symbols]

 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 wire spring 17 mounting bolt 21 clamping arm 22 clamping arm 23 mounting bolt 24 Coil spring 29 Inner part 30 Bridge plate 31 Regulator bracket 32 Clamping arm 33 Clamping arm 34 Pin 35 Coil spring

Claims (2)

[Claims] 1. A hook is rotatably supported at the center of a trunnion, and sheaves around which wire ropes are hung are mounted rotatably on both left and right sides of the trunnion. A hook device rotatably fitted and having upper end portions of left and right side plates connected to each other by a connecting plate, wherein a restricting member for restricting mutual rotation is provided between the side plate and the trunnion. A hook device characterized in that: 2. A restricting bracket is provided between a pair of bridge plates connecting the upper ends of the inner portions of the left and right side plates, and a pair of holding arms for holding the trunnion urged by a spring are pivotally supported by the restricting bracket. The hook device according to claim 1, wherein