JP2941700B2 - Hook device - Google Patents

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 or the like.

[0002]

2. Description of the Related Art As shown in FIGS. 5 to 8, a conventional hook device 101 has a hook 3 which 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. Sheaves 7 are attached to the left and right 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) at the crane boom tip is hung on the left and right sheaves 7, and the hook device 1 is suspended from the crane boom tip by the wire rope 8.

Side plates 9 are rotatably fitted to the left and right ends of the trunnion 2, respectively. The left and right end surfaces of the trunnion 2 are provided to prevent the side plates 9 from being pulled out sideways. A retaining plate 10 is attached with retaining bolts 11. Therefore, the trunnion 2 can tilt with respect to the left and right side plates 9. A guide plate 9a for preventing the wire rope 8 from coming off from the left and right sheaves 7 is provided on the left and right side plates 9 so as to substantially cover the outer peripheral portion of the sheave 7 around which the wire rope 8 is wound. It is formed integrally with the plate 9.

A connecting plate 12 is attached to the upper ends of the left and right side plates 9 by connecting bolts 14, and the left and right side plates 9 are connected to each other by the connecting plate 12.

[0005]

However, in the conventional hook device 101, the left and right side plates 9 are connected at only one upper end portion.
If 01 falls or collides with an obstacle, the left and right side plates 9 are displaced and cannot be held in parallel with each other, and the side plates 9 come into contact with the sheave 7 to prevent poor rotation of the sheave 7. Provoke. Therefore, the hoist operation for raising and lowering the hook device 101 has been hindered.

The present invention solves the above-mentioned problem in the hook device, and eliminates the displacement of the left and right side plates, prevents poor rotation of the sheave due to contact between the side plates and the sheave, and facilitates hoist work. It is an object of the present invention to provide a hook device that can be operated at a time.

[0007]

The hook device of the present invention comprises:
Hooks are 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. The left and right side plates are fitted with guide plates to prevent the wire rope from coming off from the left and right sheaves so as to cover the outer periphery of the sheave, and connect the upper ends of the left and right side plates. In a hook device connected to each other by a plate, a bridge plate connecting the left and right guide plates to each other is provided above the guide plate.

With this configuration, the hook device of the present invention is
There is no displacement between the left and right side plates, and poor rotation of the sheave due to contact between the side plate and the sheave is prevented, so that the hoist operation is performed smoothly.

[0009]

FIG. 1 is a front 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, and FIG. 3 is a plan view of the hook device without a connecting plate. FIG. 4
FIG. 4 is a sectional view taken along line BB of FIG. 3. Here, hook device 1
The hook 3 is a thrust bearing 4 at the center of the trunnion 2.
Are supported so as to be rotatable around a vertical axis and are prevented from dropping downward by a hook stopper 5.

A sheave 7 is mounted on each of 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 (not shown) at the crane boom tip is hung on the left and right sheaves 7, and the hook device 1 is suspended from the crane boom tip by the wire rope 8.

Side plates 9 are rotatably fitted to the left and right ends of the trunnion 2, respectively. The left and right end surfaces 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. Therefore, the trunnion 2 can tilt with respect to the left and right side plates 9. A guide plate 9a for preventing the wire rope 8 from coming off from the left and right sheaves 7 is provided on the left and right side plates 9 so as to substantially cover the outer peripheral portion of the sheave 7 around which the wire rope 8 is wound. It is formed integrally with the plate 9. A connecting plate 12 is attached to the upper ends of the left and right side plates 9 by connecting bolts 14, and the left and right side plates 9 are connected to each other by the connecting plate 12.

Further, on the upper portions of the left and right guide plates 9a, there are provided projections 9b projecting inward so as to face each other. A bridge plate 13 is attached to the left and right protrusions 9b with a bridge bolt 15, and the left and right guide plates 9a are connected to each other by the bridge plate 13. In this hook device 1, in addition to the left and right side plates 9 being connected by the connecting plate 12, the guide plate 9a is further connected by the bridge plate 13,
Even if the hook device 1 falls or collides with an obstacle, the left and right side plates 9 hardly displace, and are always kept parallel to each other.

Therefore, there is no possibility that the guide plate 9 contacts the sheave 7 to cause a rotation failure of the sheave 7, and the hoist operation for hoisting and lowering the hook device 1 can be performed smoothly.

[0014]

As described above, the hook device according to the present invention does not cause displacement of the left and right side plates, and prevents poor rotation of the sheave due to contact between the side plate and the sheave. Can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a front view of a hook device according to an embodiment of the present invention.

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

FIG. 3 is a plan view of the hook device in which a connecting plate is omitted.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a front view of a conventional hook device.

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

FIG. 7 is a plan view of a conventional hook device in which a connecting plate is omitted.

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

[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 9a guide plate 9b projection 10 retaining plate 12 connecting plate 13 bridge plate 14 connecting bolt 15 bridge bolt

Claims (1)

(57) [Claims] 1. A hook is rotatably supported at a central portion of a trunnion, and sheaves around which wire ropes are hung are rotatably mounted on left and right sides of the trunnion. The plates are rotatably fitted, and the left and right side plates are provided with guide plates for preventing the wire rope from coming off from the left and right sheaves so as to cover the outer peripheral portion of the sheaves. A hook device in which upper ends of the hooks are connected to each other by a connecting plate, wherein a bridge plate for connecting the left and right guide plates to each other is provided above the guide plate.