JPH0647895Y2 - Lifting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lifting mechanism used in a crane or the like.

(Prior Art) With regard to an example of a conventional hoisting mechanism, a hoisting mechanism of a crane arranged between a driver's cab of a vehicle and a cargo bed is shown in FIGS. 2 and 3 and described below. In FIG. 2, a crane 1 has a post 2 attached to a frame between a driver's cab and a cargo bed of a vehicle via a base. (The driver's cab, loading platform, frame, and base of the vehicle are not shown.) The base end of the boom 3 is pivotally supported on the tip of the post 2 to support the boom 3
Boom 3 with undulating cylinders in place between
Can be undulated. In this crane 1, a winch 5 is arranged inside a post 2, and a wire rope 6 pulled out from the winch 5 is attached to a plurality of tip pulleys 7, 7 ... A hooking mechanism is provided, which is hung around a plurality of hook block pulleys 9 provided on the hook block 8, and the rope end 10 of the wire rope 6 is fixed to the tip of the boom 3. This crane 1
The boom tip pulleys 7, 7 ... are rotatably supported by a support shaft 12 which is bridged between the side plates 11, 11 parallel to each other at the tip of the boom 3 so as to be orthogonal to the side plates 11, 11. ing. The hook block pulleys 9, 9, ... Of the hook block 8 are substantially the same as the side plates 11, 11 at the tip of the boom 3 as shown in FIG. The hook blocks are rotatably supported by a support shaft 14 which is arranged between the hook block side plates 13 and 13 arranged in parallel to each other with a space therebetween so as to be orthogonal to the side plates 13 and 13. When the hook block 8 is hoisted by the winch 5, the upper ends of the side plates 13, 13 of the hook block 8 abut against the lower ends of the side plates at the tip of the boom 3 so that the hook block 8 is lifted. 8 is located at the tip of the boom. That is, when the crane is not used, the hook block 8 is positioned on the tip of the boom 3 and stored.

(Problems to be Solved by the Invention) However, the hoisting mechanism of the crane 1 configured as described above has the following problems. That is, the hook block 8 is wound up by the winch 5, and the upper and lower side plates 13 and 13 of the hook block 8 are attached to the upper and lower ends of the boom 3 and the side plate 1 at the front end thereof.
The wire ropes 6 are hung around the boom tip pulley 7 via the hook block pulley 9 and hung around the same boom tip pulley 7 again. Instead, the hook block 8 is hooked around the boom tip pulley 7 adjacent to the boom 3 and the boom block 3 is attached to the boom block 3.
The hook block 8 is rotated as it approaches the tip portion, and the hook block pulley 9 is positioned obliquely between the adjacent boom tip pulleys 7, 7, ... In a plan view. Therefore, the upper ends of the side plates 13, 13 of the hook block 8 and the lower ends of the side plates 11, 11 at the tip of the boom 3 are in contact with each other, but the side plates 13, 13 and 11, 11 are not in parallel with each other. Therefore, if excessively wound by the winch, an extreme load may be applied to the abutting portion and the side plates 11, 11, or 13, 13 may be damaged. At the time of collision, a method has been adopted in which an interfering material is sandwiched between the both side plates to collide with each other over the entire end portions of both side plates. In this case, the former case has a drawback that the hook block and the boom tip end become heavy, which leads to a reduction in the lifting capacity of the crane, and the latter case has a drawback that it is troublesome to insert the interference material. .

An object of the present invention is to provide a novel lifting mechanism that solves the above problems.

(Means for Solving Problems) The hoisting mechanism of the present invention is provided with a wire rope pulled out from a winch between a plurality of boom tip pulleys provided at a boom tip and a plurality of hook block pulleys provided at a hook block. A lifting mechanism in which the rope end of this wire rope is fastened to the boom tip or an appropriate position of the hook block, especially when the boom tip pulley is installed between the side plates of the boom tip that are parallel to each other. A hook that is rotatably supported by a support shaft that is bridged so as to be orthogonal to both side plates, and that the hook block pulley of the hook block is arranged in parallel with each other at substantially the same intervals as the side plates of the boom tip. It is rotatably supported by a support shaft that is bridged between both side plates of the block, and the upper ends of both side plates of the hook block are both side plates of the boom tip when the hook block is hoisted. In a lifting mechanism that abuts on the lower end of the hook block so that the hook block is positioned at the tip of the boom, in a plan view, the pulley groove on one side of each hook block pulley and the pulley groove on the other side are separated from the hook block side plate. The shaft center of the support shaft of the hook block pulley is arranged to be inclined with respect to the hook block side plate in plan view so that the distances are substantially different from each other by the distance between adjacent boom tip pulleys.

(Operation) When the hoisting mechanism of the present invention having the above-described structure hoists the hook block and the upper ends of both side plates of the hook block are abutted with the lower ends of both side plates of the boom tip, the plane is flat. Since the hook block pulleys are arranged in advance so as to be positioned substantially obliquely between the boom tip pulleys as viewed, the hook block does not rotate as the hook block approaches the boom tip portion. Therefore, the upper ends of both side plates of the hook block and the lower ends of both side plates of the boom front end can be made to collide with each other substantially in parallel and almost over the entire surface. It does not damage both sides of this companion.

(Embodiment) As one embodiment of the hoisting mechanism of the present invention, a case will be described below in which the hoisting mechanism is applied to a crane arranged between a driver's cab and a bed of a vehicle as shown in FIG. 2 and described as an embodiment of the prior art. Since the present invention is different only in the construction of the hook block of the crane shown in FIG. 2, the explanation of reference numerals 2 to 7 and 10 to 12 in FIG. To use. Further, in FIG. 2, the hook block used in the lifting mechanism according to the present invention when the conventional hook block is viewed in the direction of arrow AA (plan view) is illustrated as in FIG. In FIG. 1, reference numeral 15 is a hook block, which is constructed as follows. Reference numerals 16 and 16 denote hook block side plates that are arranged in parallel with each other at substantially the same intervals as the side plates 11 at the tip of the boom 3. 17,17 ...
Is a plurality of hook block pulleys arranged on the hook block 15, and is rotatably supported by a support shaft 18 which is inclined between the hook block side plates 16 and 16 as described below. 19 is a support shaft of the hook block pulley 17
The axis 19 of the hook block pulley 17 on one side and the pulley groove 17b on the other side of the axis 18 of the hook block pulley 17
Difference of the distance between the hook block side plate 16 and the hook plate (L ')
, Are arranged obliquely with respect to the hook block side plates 16 so that the distance (L) between the boom 3 tip pulleys 7, 7 ... Therefore, the relationship between the boom tip pulleys 7, 7 ... And the hook block pulleys 17, 17 ... In a plan view is the same as that of the boom tip pulleys 7, 7 ...

The lifting mechanism according to the present invention having the above structure operates as follows. Now hook block 15 is boom 3
In order to position and store the hook block 15 at the tip of the hook, the hook block 15 is rolled up by the winch 5 and the lower ends of the side plates 11 and 11 of the boom tip are brought close to the upper ends of the side plates 16 and 16 of the hook block 15. However, as shown in FIG. 1, the axis 19 of the support shaft 18 of the hook block pulley 17 in a plan view is inclined with respect to the hook block side plate 16, and the hook block pulley 17 includes the boom tip pulley 7, Located approximately diagonally between the seven, the hook block 15 does not rotate as it did in the prior art. Therefore, both side plates 1 of the hook block 15
The upper ends of 6, 16 and the lower ends of the side plates 11, 11 at the tip of the boom 3 can be in contact with each other substantially in parallel.

(Effect of the Invention) Since the present invention is configured and operates as described above,
The lower ends of both side plates of the boom tip portion and the upper ends of both side plates of the hook block can be made to substantially contact each other, and it is not necessary to strengthen the opposing contact surfaces as described in the prior art. Each has the advantages of reducing the weight and increasing the lifting capacity of the crane.

[Brief description of drawings]

FIG. 1 is an explanatory view of a hook block used in a hoisting mechanism according to the present invention, FIG. 2 is an explanatory view of a crane for explaining one embodiment of the hoisting mechanism, and FIG. 3 is a conventional hoisting machine. It is explanatory drawing of the hook block used for a mechanism. 3; boom, 5; winch, 6; wire rope, 7; boom tip pulley, 15; hook block, 17; hook block pulley, 1
0; rope end, 11; side plate, 12; support shaft, 16; hook block side plate, 1
8; support shaft, 19; shaft center

Claims (1)

[Scope of utility model registration request] 1. A wire rope pulled out from a winch is hung between a plurality of boom tip pulleys provided at a boom tip and a plurality of hook block pulleys provided at a hook block, and a rope end of the wire rope is attached to the boom tip. Part or hook block fixed to a proper position on the hook block, in particular, the boom tip pulley is rotated between a pair of parallel side plates of the boom tip part on a support shaft bridged so as to be orthogonal to these side plates. The hook block pulley of the hook block is freely supported and rotates on a support shaft bridged between both side plates of the hook block, which are arranged in parallel with each other at substantially the same intervals as the both side plates of the boom tip. When the hook block is hoisted, the upper ends of both side plates of the hook block come into contact with the lower ends of both side plates at the tip of the boom, and the hook block is boomed. In the hoisting mechanism that is positioned at the end, the distance between the pulley groove on one side and the pulley groove on the other side of each hook block pulley in a plan view with respect to the hook block side plate is such that adjacent boom tip pulleys are adjacent to each other. A lifting mechanism characterized in that the axes of the support shafts of the hook block pulleys are arranged so as to be inclined with respect to the hook block side plates so that the distances between them are substantially different.