JP2003341979A - Bridle fixing device onto bottom boom in crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable crane work in safety by preventing a rope from being caught by a bridle fixing lug by reaction of the rope in the crane work. <P>SOLUTION: This bridle fixing device comprises the lug installed in such a way that an upper surface of it is roughly level to an upper surface of a bottom boom, a rotary lever installed to the lug at a center part to be rotatable up and down, and a fixing pin to fix the rotary lever to the lug. The rotary lever has a bridle installing hole at one end, and a fixing pin inserting hole at the other end. The lug has two fixing pin inserting holes to hold the rotary lever at a vertical position and a horizontal position in correspondence to the fixing pin inserting hole provided in the rotary lever. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridle fixing device for a crane on a bottom boom, and more particularly to a bridle fixing device for preventing a bridle mounting portion from protruding from the bottom boom during work.

[0002]

2. Description of the Related Art In recent years, a crane size has been required to be compact in spite of the improvement in crane lifting performance. The upper width of cranes is no exception, and it is common for even large models to fit in the trailer width.
Due to this effect, it is necessary to reduce the gaps between all the parts of the machine as compared with the related art, and as a result, problems such as interference between the parts occur.

The relationship between the bridle fixing lug on the bottom boom and the main winding rope is no exception, and the gap becomes smaller in the latest models, and the lug is caught by the recoil of the rope during work. There is. Particularly in a work such as a basic work or a harbor work in which the recoil of the rope is large, the rope dances on the back surface of the boom, so that the rope may jump out from the back surface of the boom to the outside of the lug. If the rope is wound in such a state, it is dangerous that the rope temporarily caught on the lug will come off when tension is applied.

A conventional bridle fixing lug on a bottom boom is shown in FIG. In FIG. 3, 10 is a bottom boom, 11
Is a bridle fixing lug welded onto the bottom boom 10, and the bridle mounting portion 12 projects upward. As described above, in the related art, since the bridle fixing lug 11 is welded on the bottom boom 10, there is a protrusion, and the lug 11 cannot be moved even when trying to avoid it during work. Therefore, there was a problem such as the rope being caught as described above.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bridle fixing device which prevents the rope from being caught by a bridle fixing lug due to a recoil of a rope during crane work and enables safe crane work. To aim.

[0006]

[Means for Solving the Problems] A lug mounted so that its upper surface is substantially flush with the upper surface of a bottom boom, and a rotary lever having a central portion rotatably mounted vertically with a pin on the lug,
A fixed pin for fixing the rotary lever to the lug, the rotary lever having a bridle mounting hole at one end and a fixed pin insertion hole at the other end, and the fixed pin insertion hole provided on the rotary lever for the lug. Two fixing pin insertion holes for holding the upright position and the horizontal position of the rotary lever are provided corresponding to the holes. The lug is made of two metal plates, and the rotary lever is rotatably held around the pin between the two metal plates.

[0007]

DETAILED DESCRIPTION OF THE INVENTION A description will be given with reference to FIGS. In FIG. 1, reference numeral 1 is a bridle fixing lug, and 2 is a rotary lever, which is sandwiched by a lug 1 composed of a pair of plate bodies in the example of the figure, and a central portion of the lug 1 is rotatably supported by a pin 3 with respect to the lug 1. .
Reference numeral 5 denotes a fixed pin insertion hole provided in the lower portion of the pin 3 provided on the rotary lever 2, and 6 denotes a bridle mounting hole provided at the other end of the rotary lever 2. Reference numeral 4 denotes a fixed pin which can be inserted into and removed from an insertion hole 5 provided in the rotary lever 2, and when the fixed pin is inserted, the rotary lever 2 is prevented from rotating. Reference numeral 7 is a fixed pin insertion hole provided in the lug 1 below the pin 3, and 8 is a fixed pin insertion hole also provided in the lug 1 at a lateral position of the pin 3. When the rotary lever 2 is held at the working position, the hole 8 is aligned with the insertion hole 5 of the rotary lever 2, and the fixing pin 4 is inserted into these holes.

Now, at the time of assembly, disassembly and transportation, FIG.
As shown in (a), the rotary lever 2 inserts the fixed pin 4 into the fixed pin insertion hole 5 on the rotary lever side and the fixed pin insertion hole 7 on the lug side so that the rotary lever 2 is projected upward from the lug 1 to make the bridle. Attach the bridle through the mounting hole 6.

(Operation) During operation, as shown in FIG. 2, the fixed pin 4 is removed from the state shown in FIG. 1, the rotary lever 2 is rotated counterclockwise around the pin 3, and the fixed pin 4 is moved to the lug 1 as shown in FIG.
The rotary lever 2 is held in a substantially horizontal position by being inserted through the side hole 5 and the rotary lever side hole 8.

In this state, since the rotary lever 2 is in a horizontal horizontal state, the rotary lever 2 does not project onto the bottom boom, and even if the rope slumps on the bottom boom, it is not caught and is safe. Is.

[0011]

The upper surface of the lug for fixing the bridle mounted on the bottom side is substantially flush with the upper surface of the bottom boom, and the rotary lever is mounted on the lug for fixing the bridle, and the rotary lever is fixed horizontally when working. Since it is possible to do so, there is no protrusion on the bottom boom, the rope is not caught on this, and safe work can be secured.

[Brief description of drawings]

FIG. 1A is a perspective view of a lug and a rotary lever assembly attached to the lug, and FIG. 1B is a Y arrow view of FIG.

FIG. 2 shows a state in which the rotary lever of FIG. 1 (b) is rotated left and fixed.

FIG. 3A is a bridle fixing lug attached to a known bottom boom, and FIG. 3B is an enlarged top view of the boom.

[Explanation of symbols]

1 Bridle fixing lug 2 Rotating lever 3 pin 4 fixed pin 5 Fixed pin insertion hole (of the rotating lever) 6 Bridle mounting hole (of rotating lever) 7, 8 Fixing pin insertion hole (provided on the lug)

Claims (2)

[Claims] 1. A lug mounted so that its upper surface is substantially flush with the upper surface of the bottom boom, a rotary lever having a central portion rotatably mounted vertically with a pin on the lug, and a rotary lever with respect to the lug. The rotary lever has a bridle mounting hole at one end and a fixed pin insertion hole at the other end, and the lug corresponds to the fixed pin insertion hole provided in the rotary lever. Bridle fixing device on a bottom boom of a crane, which is provided with two fixing pin insertion holes for holding an upright position and a horizontal position of the. 2. The bridle on the bottom boom of the crane according to claim 1, wherein the lug is made of two metal plates, and the rotary lever is sandwiched between the two metal plates so as to be rotatable around a pin. Fixing device.