JP2548473B2 - Hook block storage - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically retracting a hook block of a truck-mounted crane.

[0002]

2. Description of the Related Art Generally, a truck-mounted crane is mounted between a cab 2 of a truck 1 and a loading platform 3 as shown in FIG.
, And hooks the hook block 6 on the rope 8 pulled out from the lower part of the bumper 7 to fix it. At that time, the tension applied to the hook block 6 is adjusted by a hoisting force of a winch (not shown) so that the hook block 6 does not swing and collide with the front surface of the cab 2. At this time, if the hoisting force is too large, the bumper 7 Appropriate winding is required to damage the lower part. This operation is performed by the control lever 9 of the crane 4, but since the operation is performed while checking the tension applied to the hook block 6, it is inevitable to make a few round trips between the front of the cab 2 and the position where the control lever 9 is located. To be done. Further, if the hook block 6 is fixed to the front surface of the cab 2, the driver's view is obstructed, which hinders safe driving.

Therefore, when the boom is in a horizontal state, the center of the boom is approached from the lower direction of the pulley pivotally supported by the front end of the boom to the front or rear direction of the pulley on the lower surface of the boom. The storage device (actually, the guide curved surface of the hook block is formed so that the distance from Japanese Patent Publication No. 54-39225) was proposed. However, in this hook block storage device, part of the wire rope is hung diagonally so that the pulley at the tip of the boom and the pulley at the side of the hook block are oriented in the same direction. If you wind it up close to the section, the hook block will be twisted so that it will not hit the guide curved surface straight, and since the outer plate at the tip of the boom is the guide curved surface, if the boom width changes, the width of the hook block must also change accordingly. I have to. Further, if the diameter of the pulley on the hook block side increases, the storage space in the vertical direction increases, and the hook is not fixed even if the hook block is fixed.

On the other hand, the present applicant has installed a guide plate having an arcuate guide surface centered in front of the pulley shaft between the left and right pulleys pivotally supported on the boom tip, and the hook block. A bracket having a roller that is in contact with the guide surface of the guide plate and rolls at the upper end and a hook fixing hole at the lower end surface is movably provided at the center of the bracket, and the bracket is provided at the lower part of the hook block. Provide a hook with a protrusion at the upper end that fits into the hook fixing hole when it moves downward, and the pulley axis of the boom tip and the pulley axis of the hook block are orthogonal between the pulley of the boom tip and the pulley of the hook block. I tried to hang the wire rope so that
Hook block storage device (Japanese Patent Application No. 3-251952)
Suggested.

[0005]

The above hook block storage device (Japanese Patent Application No. 3-251952) is capable of winding the hook block sideways without damaging the wire rope and storing it sideways. The storage state is compact and the same hook block can be used regardless of the width of the boom. Moreover, not only the hook block but also the hook can be fixed at the same time. However, since a vertically movable bracket is provided at the center of the hook block, the structure is complicated and maintenance inspection is troublesome. In addition, in order to prevent the wire rope from hanging downward on the boom,
Although a wire guide is provided to guide the wire rope,
When the boom is a multi-stage boom that can expand and contract, the wire guide 42 may be provided below the tip portion of the intermediate boom 52 adjacent to the tip boom 51 as shown in FIG. 13.
In this case, when the boom 5 is shortened and the hook block 6 is retracted, the wire guide 42 provided at the lower end of the tip of the intermediate boom 52 interferes with the hook block 6 and the hook block 6 is retracted.
It may not be possible to store in close proximity to.

The present invention is to solve the above-mentioned problems in the hook block storage device, and the structure of the hook block is simple and inexpensive, and maintenance and inspection can be easily performed. An object of the present invention is to provide a storage device for a hook block that can prevent a storage failure due to a wire guide and that can store the hook block near the boom.

[0007]

In order to solve the above-mentioned problems, the present invention comprises a boom capable of undulating and expanding and contracting, and a wire rope is hung from the pulley of the boom tip portion to the pulley of the hook block to form the hook block. In a crane device for suspending, hoisting the hook block with a winch, and lowering the hook block, an arc-shaped guide surface is formed between the left and right pulleys pivotally supported on the boom tip, and the distance from the pulley shaft gradually decreases upward. The guide plate is attached, and the trunnion is rotatably mounted between the side plates at the center of the hook block. The hook can be pivoted about the axis orthogonal to the pivot axis of the trunnion at the center of the trunnion. A roller that is mounted and pivotally attached to the side plate side of the trunnion, and rolls on the upper end of the hook block in contact with the guide surface of the guide plate. A hook block storage device is configured by providing a wire rope between the pulley of the boom tip and the pulley of the hook block so that the pulley shaft of the boom tip and the trunnion of the hook block are orthogonal to each other. .

Further, when the wire guide is provided at the lower end of the intermediate boom in the case of a multi-stage boom in which the boom can expand and contract, the wire guide pivotally supports the guide roller for guiding the wire rope at the lower end, and the wire guide is supported by the hook block when the hook block is stored. It is provided with a rotating bracket that is pushed and rotates upward so that the hook block can be moved to a position close to the boom.

[0009]

When the hook block is stored, the control lever is operated to drive the winch to wind the hook block. The rolled up hook block moves up and the roller at the upper end contacts the guide surface of the guide plate. When the hook block is further wound up, the rollers roll along the guide surface, and the hook block moves in the direction in which the distance between the pulley of the boom tip and the pulley of the hook block decreases, and the boom tip ends. The vehicle is moved to a position where the distance between the pulley of the hook block and the pulley of the hook block is minimized and stored. At this time, when the roller is in contact with the guide surface of the guide plate, the hoisting force acting on the trunnion from the wire rope via the pulley of the hook block and the reaction force acting on the side plate via the roller, The mounting surfaces of the side plate and the trunnion are pressed against each other to prevent the trunnion from rotating, and the hook is fixed without swinging.

Even when a wire guide is provided below the tip of the intermediate boom in a multi-stage boom in which the boom can expand and contract, a guide roller for guiding the wire guide to the wire rope is pivotally supported at the lower end so that the hook block is retained when the hook block is stored. If it is provided with a pivot bracket that is pushed and pivots upward, it does not interfere with the movement of the hook block, and the hook block moves to a position close to the boom and is stored.

[0011]

1 is a side view of a boom tip portion, FIG. 2 is a front view of the boom tip portion, FIG. 3 is a sectional view taken along line III-III of FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. At the tip of the boom 5,
By the pulley shaft 25, the pulley 10 (the first pulley 10 on the left side
L, the second pulley 10R) is rotatably supported on the right side, and an arcuate shape in which the distance from the pulley shaft 25 gradually decreases between the first pulley 10L on the left side and the second pulley 10R on the right side. A guide plate 27 having a guide surface 26 is attached.
The end of the guide surface 26 is a concave portion 24. Further, on the left side of the first pulley 10L, a guide wheel 11 that leads to the fastening portion 12 that fixes the end of the wire rope 14 is attached. The guide wheel 11 is formed by cutting out a part of a pulley similar to the first pulley 10L.

At the center of the hook block 6, a trunnion 31 is rotatably fitted between the side plates 30 (the front side plate 30F and the rear side plate 30R). At both ends of the trunnion 31, a retaining plate 32 is fixed with retaining bolts 33, and the side plate 3
0F and 30R are prevented from being pulled out from the trunnion 31. At the center of the trunnion 31, a hook 16 is attached by a thrust bearing 39 so as to be rotatable about an axis orthogonal to the rotation axis of the trunnion 31. Hook 1
A hook stopper 34 is attached to the upper end of the hook 6 to prevent the hook 16 from being pulled out from the trunnion 31. The trunnion 31 includes pulleys 15 (front side plate 30).
Third pulley 15F on the side, side plate 30R on the back side
A fourth pulley 15R) is pivotally attached to the side by a radial bearing 35. Inside the pulley 15 (the third pulley 15F on the front side plate 30 side and the fourth pulley 15R on the rear side plate 30R side), a retainer 13 for the wire rope 14 is attached. A drain hole 46 is provided in the lower portion of the stopper 13.

On the upper end of the hook block 6, a bracket 36 is bridged between the side plates 30F and 30R on both sides so as to be separated from each other to the left and right. This left and right bracket 3
Two pins 37 are provided in front of and behind each other between 6 and a roller 38 that rolls in contact with the guide surface 26 of the guide plate 27 is pivotally supported by a bearing 40 on the pin 37. There is.

The hook block 6 is suspended from the boom 5 by the wire rope 14 wound around the pulley 15 and receives a load acting on the hook 16 via the trunnion 31. A load such as a suspended load does not act on the side plate 30. The side plate 30 is a trunnion 3
Although it can be rotated with respect to 1, the center of gravity is below the trunnion 31, so that it is normally in the position shown.

The hook block 6 is wound up and down by the wire rope 14 by operating a winch (not shown) on the base end side of the boom 5. This wire rope 14
Enters the first pulley 10L at the tip of the boom 5 through the wire guide 42 attached to the lower surface of the boom 5, passes through the third pulley 15F of the hook block 6, and reaches the second pulley at the tip of the boom 5.
Pull out from the front side of the pulley 10R to the back side, further pass through the fourth pulley 15R of the hook block 6, pass through the guide wheel 11 provided at the tip of the boom 5 from the back side to the front side, and wire rope 14
Cotter 4 in the socket 43 of the fastening part 12 for fixing the end of
It is fixed at 4.

To store the hook block 6 from the state shown in FIG. 1, the winch is operated to wind the hook block 6. The wound hook block 6 rises to the state shown in FIG. 5, and the roller 38 at the upper end contacts the guide surface 26 of the guide plate 27. When the hook block 6 is further wound up, the roller 38 rolls along the guide surface 26, and the hook block 6 moves in the direction in which the distance L between the pulley 10 at the boom tip and the pulley 15 of the hook block 6 becomes smaller. As shown in FIG. 6, the roller 38 is moved to a position where the distance L between the pulley 10 of the boom tip and the pulley 15 of the hook block 6 is minimized, and the roller 38 is fitted into the concave portion 24 and stored. It Pulley shaft 25 and hook block 6 at the tip of boom 5
Since it is orthogonal to the trunnion 31 of No. 3, the height H when stored is not influenced by the diameter of the pulley 15 of the hook block 6.
When the roller 38 is in contact with the guide surface 26 of the guide plate 27 as described above, the hoisting force acting on the trunnion 31 from the wire rope 14 via the pulley 15 of the hook block 6 and the side force via the roller 38. By the reaction force acting on the plate 30, the side plate 30 and the trunnion 3
The mating surface with 1 is pressed to prevent the trunnion 31 from rotating, and the hook 16 is fixed without swinging.

When the crane operation is restarted, if the winch is lowered, the hook block 6 returns to the hanging position in the opposite movement. FIG. 7 shows a wire rope 14
7 shows another embodiment of the fastening portion 12 for fixing the end of the guide wheel 11 and the fastening portion 12 are attached to the outside of the boom 5. In this embodiment, the work of fixing the end of the wire rope 14 becomes easy.

FIG. 8 is a side view of a boom tip portion of an embodiment in which a wire guide is provided below the tip portion of an intermediate boom adjacent to the tip boom of a telescopic multi-stage boom, and FIG. 9 is an enlarged view of the wire guide. The side view shown in FIG. 10 is a front view thereof. In the wire guide 42T, a guide bracket 61 is fixedly provided at a lower end portion of an intermediate boom 52, and a rotating bracket 62 is pivotally supported by a pivot pin 63 at a lower portion of a front end portion of the guide bracket 61. . A guide roller 64 for guiding the wire rope 14 is rotatably supported by the tip of the rotating bracket 62. At the upper part of the guide bracket 61, a blocking piece 65 for blocking the rotation of the rotation bracket 62 around the pivot pin 63 in the counterclockwise direction in the drawing at a predetermined position is provided.

When the hook block 6 is stored, as shown in FIG. 11, the rotating bracket 62 is pushed by the hook block 6 and rotates about the pivot pin 63 in the clockwise direction in the figure. Therefore, the wire guide 42T does not interfere with the movement of the hook block 6, and the hook block 6 moves to a position close to the boom 5 and is stored therein. When resuming crane work, if the winch lowering operation is performed,
The hook block 6 returns to the hanging position, and the pivot bracket 62 pivots counterclockwise in the figure around the pivot pin 63 by the tension of the wire rope 14 to return to the original position.

[0020]

As described above, according to the hook block storage device of the present invention, the hook block can be rolled up and stored sideways so as not to be twisted, and the storage state is compact and the same hook can be used regardless of the width of the boom. Can be handled with blocks. Moreover, not only the hook block but also the hook can be fixed at the same time. Moreover, since it is not necessary to provide a vertically movable bracket at the center of the hook block, the structure of the hook block is simple and inexpensive, and maintenance and inspection can be easily performed.

Further, when a wire guide is provided below the tip of the intermediate boom in a multi-stage boom in which the boom can expand and contract,
A guide roller for guiding the wire rope is pivotally supported at the lower end of the wire guide, and the hook block is provided with a rotating bracket that is pushed by the hook block and rotates upward when the hook block is retracted. Can be stored by moving to a position close to.

[Brief description of drawings]

FIG. 1 is a side view of a boom tip portion.

FIG. 2 is a front view of a boom tip.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an operation explanatory view of the hook block storage device.

FIG. 6 is a diagram for explaining the operation of the hook block storage device.

FIG. 7 is a fastening portion 12 for fixing the end of the wire rope 14.
It is explanatory drawing of the other Example of this.

FIG. 8 is a side view of the boom tip portion of the embodiment in which the wire guide is provided below the tip portion of the intermediate boom.

FIG. 9 is a side view showing an enlarged wire guide.

FIG. 10 is an enlarged front view showing the wire guide.

FIG. 11 is an operation explanatory view of the wire guide.

FIG. 12 is a side view of the crane device showing a conventional hook block stored state.

FIG. 13 is a side view of the boom tip portion showing a state in which a conventional wire guide is provided below the tip portion of the intermediate boom.

[Explanation of symbols]

 4 Crane 5 Boom 6 Hook Block 9 Control Lever 10 Pulley 14 Wire Rope 15 Pulley 16 Hook 25 Pulley Shaft 26 Guide Surface 27 Guide Plate 30 Side Plate 31 Trunnion 38 Roller 42T Wire Guide 52 Intermediate Boom 62 Rotating Bracket 64 Guide Roller

Claims (2)

(57) [Claims] 1. A crane comprising an undulating and extendable telescopic boom, a wire rope is hung from a pulley of a boom end portion to a pulley of a hook block to suspend the hook block, and the hook block is hoisted and unwound by a winch. In the device, between the left and right pulleys pivotally supported at the boom tip, a guide plate having an arc-shaped guide surface whose distance from the pulley shaft gradually decreases upward is attached, and in the center of the hook block, A trunnion is rotatably attached between the side plates, and a hook is attached to the center of the trunnion so as to be rotatable about an axis orthogonal to the rotation axis of the trunnion.
A pulley is pivotally attached to the side plate side of the trunnion, and a roller that rolls in contact with the guide surface of the guide plate is provided at the upper end of the hook block, and the boom is provided between the pulley of the boom tip and the pulley of the hook block. A device for storing a hook block, wherein a wire rope is hung so that a pulley shaft of a tip portion and a trunnion of the hook block are orthogonal to each other. 2. A multi-stage boom capable of expanding and contracting a wire guide equipped with a pivoting bracket for pivotally supporting a guide roller for guiding a wire rope at a lower end thereof and being pivoted upward by being pushed by the hook block when the hook block is stored. The hook block storage device according to claim 1, wherein the hook block storage device is provided at a lower portion of a front end portion of the intermediate boom.